CN120834701A

CN120834701A - Voltage conversion module, power supply circuit, chip, electronic device and voltage conversion method

Info

Publication number: CN120834701A
Application number: CN202511014470.8A
Authority: CN
Inventors: 游洪程; 谭伟东; 张俊; 伏奎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2025-07-22
Filing date: 2025-07-22
Publication date: 2025-10-24

Abstract

The embodiment of the application discloses a voltage conversion module, a power supply circuit, a chip, electronic equipment and a voltage conversion method. The voltage conversion module is applied to a power supply circuit, the power supply circuit further comprises a battery, a charging management module and a load, the charging management module is used for being connected with a power supply device, the voltage conversion module is respectively connected with the battery and the charging management module and comprises a bypass circuit and a voltage conversion circuit which are connected in parallel, and the voltage conversion module is used for boosting the first voltage provided by the battery through the voltage conversion circuit and transmitting the second voltage obtained by boosting to the charging management module so as to supply power to the load under the condition that the battery voltage of the battery is smaller than or equal to a first voltage threshold. In the embodiment of the application, the use limit of the battery under low electric quantity can be reduced, the capacity of the battery can be more released, and the endurance capacity of the electronic equipment provided with the battery can be improved.

Description

Voltage conversion module, power supply circuit, chip, electronic device, and voltage conversion method

Technical Field

The present application relates to the field of electronic circuits, and in particular, to a voltage conversion module, a power supply circuit, a chip, an electronic device, and a voltage conversion method.

Background

At present, the minimum discharge voltage of a graphite cathode battery widely applied to electronic equipment is generally more than 3.2V (volts), and the power supply voltage of the load of most electronic equipment is designed according to the graphite cathode battery. Compared with the traditional graphite cathode battery, the energy density of the silicon cathode battery is higher, the silicon cathode battery is an important development direction of the battery, the lowest discharge voltage of the silicon cathode battery can further detect 2.7V or even 2.5V, the voltage provided by the silicon cathode battery is lower than the risk of undervoltage locking (Under Voltage Lockout, UVLO) voltage of a load, and the situation that the load cannot work normally occurs. Therefore, the silicon negative electrode battery needs to limit the power to be used under low power due to the limitation of the UVLO voltage of the load, and the capacity of the silicon negative electrode battery cannot be completely released.

Disclosure of Invention

The embodiment of the application discloses a voltage conversion module, a power supply circuit, a chip, electronic equipment and a voltage conversion method, which can reduce the use limit of a battery under low electric quantity, release the capacity of the battery more and improve the cruising ability of the electronic equipment provided with the battery.

The embodiment of the application discloses a voltage conversion module, which is applied to a power supply circuit, wherein the power supply circuit further comprises a battery, a charging management module and a load, the charging management module is connected with the load, and the charging management module is used for being connected with a power supply device;

The voltage conversion module includes:

a bypass circuit;

A voltage conversion circuit connected in parallel with the bypass circuit;

The voltage conversion module is used for transmitting the first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the load when the battery voltage of the battery is larger than a first voltage threshold value, and performing boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage and transmitting the second voltage to the charge management module to supply power to the load when the battery voltage of the battery is smaller than or equal to the first voltage threshold value.

The embodiment of the application discloses a power supply circuit, which comprises:

A load;

a battery for providing a first voltage to the voltage conversion module;

the charging management module is connected with the load and is used for being connected with a power supply device;

A voltage conversion module as described above.

The embodiment of the application discloses a chip, which comprises the voltage conversion module or the power supply circuit.

The embodiment of the application discloses electronic equipment, which comprises the voltage conversion module, the power supply circuit or the chip.

The embodiment of the application discloses a voltage conversion method, which comprises the following steps:

transmitting a first voltage provided by the battery to a charging management module through a bypass circuit of a voltage conversion module under the condition that the battery voltage of the battery is larger than a first voltage threshold value so as to supply power to a load;

and under the condition that the battery voltage of the battery is smaller than or equal to the first voltage threshold value, performing boosting processing on the first voltage provided by the battery through a voltage conversion circuit of the voltage conversion module to obtain a second voltage, and transmitting the second voltage to the charge management module so as to supply power to the load.

The voltage conversion module is applied to the power supply circuit, the power supply circuit further comprises a battery, a charging management module and a load, the charging management module is connected with the load, the charging management module is used for being connected with a power supply device, a first end of the voltage conversion module is connected with the battery, a second end of the voltage conversion module is connected with the charging management module, the voltage conversion module comprises a bypass circuit and a voltage conversion circuit, the first voltage provided by the battery is transmitted to the charging management module through the bypass circuit when the battery voltage of the battery is larger than a first voltage threshold value so as to supply power to the load, the first voltage provided by the battery is subjected to boosting processing through the voltage conversion circuit when the battery voltage of the battery is smaller than or equal to the first voltage threshold value so as to obtain a second voltage, and the second voltage is transmitted to the charging management module so as to supply power to the load. Through setting up voltage conversion module between battery and charge management module to when the battery voltage of battery is less than or equal to first voltage threshold value, the voltage conversion circuit through voltage conversion module steps up the first voltage of battery output, only need guarantee that the second voltage that obtains of stepping up is greater than charge management module and the UVLO voltage of load, can let charge management module and load all normally work, consequently can let the battery put battery voltage lower, can reduce the restriction of use of battery under low electric quantity, release the capacity of battery more, improve the duration of the electronic equipment who sets up this battery.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1A is a schematic diagram of a related art power supply circuit;

FIG. 1B is a schematic diagram of a related art boost-bypass module;

FIG. 2 is a block diagram of a voltage conversion module and a power supply circuit in one embodiment;

FIG. 3 is a block diagram of a voltage conversion module and a power supply circuit according to another embodiment;

FIG. 4 is a circuit schematic of a power supply circuit in one embodiment;

FIG. 5 is a block diagram of a voltage conversion module and a power supply circuit according to another embodiment;

FIG. 6 is a block diagram of a voltage conversion module and a power supply circuit according to another embodiment;

FIG. 7 is a schematic diagram of implementing closed loop control of a voltage conversion circuit in one embodiment;

FIG. 8A is a schematic diagram of the voltage conversion circuit 214 in one embodiment;

FIG. 8B is a schematic diagram of the voltage conversion circuit 214 according to another embodiment;

FIG. 9A is a schematic diagram of a voltage conversion circuit 214 according to another embodiment;

FIG. 9B is a schematic diagram of the voltage conversion circuit 214 according to another embodiment;

FIG. 10 is a schematic circuit diagram of a power supply circuit in another embodiment;

FIG. 11 is a flow chart of a voltage conversion method in one embodiment.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch, without departing from the scope of the application. The first switch and the second switch are both switches, but they are not the same switch. The term "plurality" as used herein refers to two and more than two. The term "and/or" as used herein refers to one of, or any combination of, the various schemes therein. The term "coupled" as used herein is to be interpreted broadly, and may be used, for example, as a fixed connection, as a removable connection, or as an integral connection, as a direct connection, as an indirect connection via an intermediary, as a communication between two elements, or as an interaction between two elements. The specific meaning of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific circumstances.

The lowest discharge voltage of the graphite cathode battery which is widely used at present is generally above 3.2V, and the load of most electronic equipment is designed based on the graphite cathode battery, so that the power supply voltage required by the load of most electronic equipment is above 3.2V. Silicon negative cells have a higher energy density than graphite negative cells, but the lowest discharge voltage is lower, 2.7V or even 2.5V, resulting in a partial load that does not operate properly at such low voltages. In order to solve this problem, in the related art, a booster circuit is generally provided in a power supply circuit of a silicon negative electrode battery, and a discharge voltage of the silicon negative electrode battery is boosted by the booster circuit to ensure normal operation of a load.

Fig. 1A is a circuit schematic diagram of a power supply circuit in the related art. As shown in fig. 1A, the discharge voltage Vbat output from the Battery supplies power to the load in the system, that is, vsys=vbat, through a BAT FET (Battery FET) of the charge management chip (CHARGER IC). Since the UVLO voltage of the Power management chip (Power MANAGEMENT IC, PMIC) is 2v to 2.5v, the UVLO voltage of a part of the load (such as an imaging device, a radio frequency device, etc.) with high UVLO is greater than the UVLO voltage of the PMIC, so that the part of the load needs to be powered through the boost-bypass module 100. For example, when the discharge voltage Vbat of the battery output is greater than the UVLO voltage of the load of the high UVLO, the boost-bypass module 100 turns on the bypass switch to directly supply the voltage Vsys to the load of the high UVLO, and when the discharge voltage Vbat of the battery output is less than the UVLO voltage of the load of the high UVLO, the boost-bypass module 100 operates in a boost state, the boost-bypass module 100 turns off the bypass switch to boost the voltage Vsys through the unidirectional boost circuit, and then supplies the boosted voltage to the load of the high UVLO to supply the power.

Fig. 1B is a circuit schematic diagram of a boost-bypass module in the related art. As shown in fig. 1B, the boost-bypass module 100 includes a bypass switch Q1 and a boost circuit 110, and the boost circuit 110 includes an inductor L1, a switch Q2 and a switch Q3. When the discharge voltage Vbat of the battery output is smaller than the UVLO voltage of the load with high UVLO, the bypass switch Q1 is switched on, the voltage Vsys supplies power to the load through the bypass switch Q1 which is switched on, when the discharge voltage Vbat of the battery output is smaller than the UVLO voltage of the load with high UVLO, the bypass switch Q1 is switched off, the switch Q2 and the switch Q3 are switched back and forth between on and off, and the voltage Vsys is boosted through charging and discharging of the inductor L1.

Because the internal resistance of the silicon cathode battery is larger when the battery is in low power, a processor, an imaging device and the like in the electronic equipment have large transient current in partial use scenes (such as photographing scenes and game scenes), the voltage drop in the battery is increased due to the increase of the transient current, and accordingly the discharge voltage Vbat output by the battery is subjected to transient drop, namely the voltage Vsys is subjected to transient drop, and the risk of being lower than 2V is caused, so that the PMIC cannot work. The silicon negative electrode battery is limited by the limitation that the UVLO voltage of the PMIC is 2V-2.5V, the power used by the silicon negative electrode battery needs to be limited under low electric quantity, and the capacity of the silicon negative electrode battery cannot be completely released.

The voltage conversion module, the power supply circuit, the chip, the electronic equipment and the voltage conversion method disclosed by the embodiment of the application can reduce the use limit of the battery under low electric quantity, release the capacity of the battery more and improve the cruising ability of the electronic equipment provided with the battery.

As shown in fig. 2, in one embodiment, a voltage conversion module 210 is provided, the voltage conversion module 210 is applicable to a power supply circuit 200, the power supply circuit 200 further includes a battery 220, a charge management module 230, and a load 240, and the charge management module 230 is connected to the load 240. The voltage conversion module 210 may be disposed between the battery 220 and the charge management module 230, a first end of the voltage conversion module 210 may be connected with the battery 220, and a second end of the voltage conversion module 210 may be connected with the charge management module 230.

In the case where the battery 220 is in a discharge state, the battery 220 may output a first voltage, which refers to a discharge voltage of the battery 220, to the voltage conversion module 210.

In some embodiments, battery 220 may be a battery with a lower minimum discharge voltage, such as a silicon negative battery, which may refer to a minimum value of the first voltage output by battery 220, e.g., the minimum discharge voltage of battery 220 may be less than 2.5V, or even less than 2V. Alternatively, the battery 220 may be a single cell battery, and the first voltage provided by the battery 220 may be equal to the battery voltage of the battery 220.

The charging management module 230 may be used to connect to the power supply device 300, and in case the charging management module 230 is connected to the power supply device 300, the charging management module 230 may charge the battery 220 according to the voltage and/or current provided by the power supply device 300. The charge management module 230 may control and manage the charging process of the battery 220, for example, may control the charging current and/or the charging voltage of the battery 220 during the charging process.

Alternatively, the power supply 300 may include, but is not limited to, an adapter, a mobile power supply, and the like. The charge management module 230 may be connected to the power supply device 300 by a wired or wireless method. For example, the charge management module 230 may include a charging interface, which may be a USB (Universal SerialBus ) interface (e.g., type-C interface, etc.), which may be connected to the power supply 300 through a charging cable. It should be noted that, the specific connection manner between the charge management module 230 and the power supply device 300 is not limited in the embodiment of the present application.

In some embodiments, charge management module 230 may also include a BAT FET that may be used to turn on or off a connection path between battery 220 and load 240. In the case where the load 240 requires the battery 220 to supply power, the BAT FET may conduct a path between the battery 220 and the load 240, and the first voltage output by the battery 220 may be transmitted to the load 240 via the BAT FETs of the voltage conversion module 210 and the charge management module 230 to supply power to the load 240. Alternatively, in the event that load 240 does not require battery 220 to be powered, the BAT FET may disconnect the path between battery 220 and load 240.

The voltage conversion module 210 may include a bypass circuit 212 and a voltage conversion circuit 214, the bypass circuit 212 may be connected with the battery 220 and the charge management module 230, respectively, the voltage conversion circuit 214 may be connected with the battery 220 and the charge management module 230, respectively, and the bypass circuit 212 and the voltage conversion circuit 214 may be connected in parallel.

The voltage conversion module 210 is configured to transmit the first voltage provided by the battery 220 to the charge management module 230 through the bypass circuit 212 to supply power to the load 240 when the battery voltage of the battery 220 is greater than a first voltage threshold, and to boost the first voltage provided by the battery 220 through the voltage conversion circuit 214 to obtain a second voltage and transmit the second voltage to the charge management module 230 to supply power to the load 240 when the battery voltage of the battery 220 is less than or equal to the first voltage threshold.

The voltage conversion module 210 may select to transmit the voltage to the charge management module 230 via the bypass circuit 212 or the voltage conversion circuit 214 based on the battery voltage of the battery 220. The bypass circuit 212 may be a low delay and/or low impedance circuit, in some embodiments, the voltage conversion module 210 may selectively turn on the bypass circuit 212 based on the battery voltage of the battery 220, with the bypass circuit 212 being conductive, the voltage conversion circuit 214 not operating, and with the bypass circuit 212 being non-conductive, the voltage conversion circuit 214 operating.

In the case where the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, the first voltage provided by the battery 220 is transmitted to the charge management module 230 through the bypass circuit 212, and since the impedance of the bypass circuit 212 is low, the impedance of the bypass circuit 212 is negligible, and thus the voltage transmitted by the bypass circuit 212 to the charge management module 230 may be equal to the first voltage output by the battery 220.

Optionally, the first voltage threshold may be set according to actual requirements, and the first voltage threshold may be greater than the UVLO voltage of the charge management module 230 and at least part of the load 240. The load 240 may include a first load, a second load and a PMIC, the first load is a high UVLO load, the second load is a low UVLO load, the UVLO voltage of the first load is greater than the UVLO voltage of the second load, further, the first load may be a load with a UVLO voltage greater than a UVLO threshold, for example, the first load may include, but is not limited to, one or more of an image capturing module, a display screen, a radio frequency module, and the like. The first voltage threshold may be greater than the UVLO voltage of all loads in the electronic device, or the first voltage threshold may be at least greater than the UVLO voltage of the second load and PMIC.

In the case that the battery voltage of the battery 220 is greater than the first voltage threshold, it is indicated that the discharge voltage of the battery 220 is greater, and normal operation of the charge management module 230 and the load 240 can be supported, so that the first voltage output by the battery 220 can be directly provided to the charge management module 230 through the bypass circuit 212, thereby supplying power to the load 240, improving the efficiency of the voltage conversion module 210, and reducing unnecessary power consumption.

In the case that the battery voltage of the battery 220 is less than or equal to the first voltage threshold, it is indicated that the discharge voltage of the battery 220 is small and normal operation of the charge management module 230 and/or the load 240 cannot be supported, and therefore, the voltage conversion circuit 214 may boost the first voltage provided by the battery 220 to obtain a second voltage greater than the first voltage threshold and transmit the second voltage to the charge management module 230 to supply power to the load 240.

In some embodiments, the voltage conversion circuit 214 may include a DC-DC (direct current-direct current conversion) circuit, and the voltage conversion circuit 214 may be comprised of a switching device, which may include, but is not limited to, an IGBT (Insulated Gate Bipolar Transistor ), a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), etc., and an energy storage device, which may include an inductance and/or a capacitance, etc.

The voltage conversion circuit 214 has a boosting function, and can boost the first voltage output by the battery 220, and convert the first voltage less than or equal to the first voltage threshold into the second voltage greater than the first voltage threshold, so as to ensure the normal operation of the charge management module 230 and the load 240. Alternatively, the boost ratio of the voltage conversion circuit 214 may be fixed, such as 1:2, 1:3, 2:3, etc. (referring to the ratio between the input voltage and the output voltage of the voltage conversion circuit 214), or alternatively, the boost ratio of the voltage conversion circuit 214 may be dynamically variable and dynamically adjustable according to the voltage required by the charge management module 230 and the load 240 and the first voltage output by the battery 220.

Compared to the power supply circuit shown in fig. 1A, in the embodiment of the application in which the battery directly supplies power to the charge management chip, the PMIC and the low UVLO load, the voltage conversion module 210 is disposed between the battery 220 and the charge management module 230, the charge management module 230 and the load 240 are not directly supplied with power by the battery 220, the battery 220 supplies power to the charge management module 230 and the load 240 through the voltage conversion module 210, and when the battery 220 is low (e.g., the battery voltage of the battery 220 is less than or equal to the first voltage threshold), the voltage conversion circuit 214 in the voltage conversion module 210 boosts the first voltage, so that the second voltage obtained by boosting is only required to be greater than the UVLO voltage of the charge management module 230 and the load 240, and the charge management module 230 and the load 240 can work normally. For example, the power supply circuit shown in fig. 1A is limited by the UVLO voltage of the PMIC, and the voltage output by the battery 220 is usually required to be greater than 2.5V, so as to avoid that the voltage output by the battery 220 is lower than 2V due to transient sag, so that the PMIC cannot operate, and the voltage output by the battery 220 is limited by the UVLO voltage of the charge management chip. In the embodiment of the present application, only the second voltage output by the voltage conversion circuit 214 is required to be greater than the UVLO voltage of the charge management module 230 and the load 240, so that the first voltage output by the battery 220 is lower and the discharge is more sufficient.

In the embodiment of the present application, by setting the voltage conversion module 210 between the battery 220 and the charge management module 230, and boosting the first voltage output by the battery 220 by the voltage conversion circuit 214 of the voltage conversion module 210 when the battery voltage of the battery 220 is less than or equal to the first voltage threshold, only the second voltage obtained by boosting is required to be ensured to be greater than the UVLO voltage of the charge management module 230 and the load 240, so that the charge management module 230 and the load 240 can work normally, thereby the battery 220 can be kept lower, the limit of the battery 220 in use under low power can be reduced, the capacity of the battery 220 can be released more, and the endurance of the electronic device provided with the battery can be improved.

In some embodiments, the voltage conversion module 210 may support bidirectional power transmission, which may mean that the power transmission direction of the voltage conversion module 210 may be switched, the input terminal and the output terminal of the voltage conversion module 210 may not be fixed, and the input terminal and the output terminal of the voltage conversion module 210 may be switched with each other. For example, in some cases, the first end of the voltage conversion module 210 is an input end and the second end of the voltage conversion module 210 is an output end, and in some cases, the first end of the voltage conversion module 210 is an output end and the second end of the voltage conversion module 210 is an input end.

In one embodiment, the power transmission direction of the voltage conversion module 210 is the first direction when the charge management module 230 is not connected to the power supply device 300, and the power transmission direction of the voltage conversion module 210 is the first direction or the second direction when the charge management module 230 is connected to the power supply device 300.

The first direction is a direction from the first end of the voltage conversion module 210 to the second end of the voltage conversion module 210, that is, the electric energy is transmitted from the battery 220 to the charge management module 230 and the load 240 through the voltage conversion module 210. The second direction is a direction from the second end of the voltage conversion module 210 to the first end of the voltage conversion module 210, that is, the electric power is transmitted from the charge management module 230 to the battery 220 through the voltage conversion module 210.

When the charging management module 230 is not connected to the power supply device 300, both the charging management module 230 and the load 240 are powered by the battery 220, the battery 220 is in a discharging state, and the first voltage output by the battery 220 is output to the charging management module 230 and the load 240 via the voltage conversion module 210. Therefore, in the case that the charge management module 230 is not connected to the power supply device 300, the voltage conversion module 210 only needs to support unidirectional power transmission.

Further, the voltage conversion module 210 is further configured to, when the charging management module 230 is not connected to the power supply device 300, transmit the first voltage provided by the battery 220 to the charging management module 230 through the bypass circuit 212 to supply power to the charging management module 230 and the load 240 if the battery voltage of the battery 220 is greater than the first voltage threshold.

The voltage conversion module 210 is further configured to, when the charging management module 230 is not connected to the power supply device 300, boost the first voltage provided by the battery 220 by the voltage conversion circuit 214 to obtain a second voltage if the battery voltage of the battery 220 is less than or equal to the first voltage threshold, and transmit the second voltage to the charging management module 230 to supply power to the charging management module 230 and the load 240.

In the case that the charging management module 230 is not connected to the power supply device 300, the charging management module 230 and the load 240 are powered by the battery 220 only, and the voltage conversion module 210 only needs to support unidirectional power transmission, the voltage conversion circuit 214 of the voltage conversion module 210 may be in the first operation mode, and in this first operation mode, the voltage conversion circuit 214 only supports unidirectional power transmission. When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, the voltage conversion circuit 214 does not operate, and the first voltage output by the battery 220 is directly transmitted to the charge management module 230 and the load 240 through the bypass circuit 212 to supply power to the charge management module 230 and the load 240. When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is disconnected, the voltage conversion circuit 214 works, the first voltage output by the battery 220 is boosted by the voltage conversion circuit 214, and the charge management module 230 and the load 240 are powered on based on the second voltage obtained by boosting, so that the normal operation of supplying power to the charge management module 230 and the load 240 is ensured, the battery 220 can be discharged more fully, and the cruising ability of the electronic equipment provided with the battery is improved.

Since the voltage conversion circuit 214 only needs to support unidirectional power transmission in the first operation mode, the operation frequency of the voltage conversion circuit 214 may be small, i.e., the switching devices in the voltage conversion circuit 214 may be switched back and forth between on and off according to the small frequency, for example, the operation frequency of the voltage conversion circuit 214 may be 20KHz (kilohertz), 50KHz, 100KHz, etc. in the first operation mode, but not limited thereto, so as to reduce the loss of the voltage conversion circuit 214 and improve the conversion efficiency of the voltage conversion circuit 214.

In the case that the charge management module 230 is connected to the power supply device 300, the load 240 may be separately supplied by the power supply device 300, or may be commonly supplied by the power supply device 300 and the battery 220, specifically, by the power supply device 300, or by the power supply device 300 and the battery 220, which mainly depends on the supply current required by the load 240. For example, when the power supply current required by the load 240 is large, the current supplied by the power supply device 300 cannot meet the power supply requirement of the load 240, the power supply device 300 and the battery 220 can supply power to the load 240 together, and when the power supply current required by the load 240 is small, the current supplied by the power supply device 300 meets the power supply requirement of the load 240, and the power supply device 300 can supply power to the load 240 alone. Further, in the case of the power supply device 300 to which the charge management module 230 is connected, if the battery 220 is not required to supply power to the load 240, the battery 220 may be charged based on the voltage and/or current input by the power supply device 300.

In the case where the charge management module 230 is connected to the power supply device 300, the battery 220 may be in a discharged state or a charged state, and thus, the voltage conversion module 210 needs to support bi-directional power transmission.

The voltage conversion module 210 is further configured to, when the charge management module 230 is connected to the power supply device 300, transmit the first voltage provided by the battery 220 to the charge management module 230 through the bypass circuit 212 to supply power to the load 240 together with the charge management module 230, or transmit the third voltage output by the charge management module 230 to the battery 220 through the bypass circuit 212 to charge the battery 220 if the battery voltage of the battery 220 is greater than the first voltage threshold.

The voltage conversion module 210 is further configured to, when the charge management module 230 is connected to the power supply device 300, boost the first voltage provided by the battery 220 by the voltage conversion circuit 214 to obtain a second voltage, and transmit the second voltage to the charge management module 230 to supply power to the load 240 together with the charge management module 230, or to perform the step-down process on the third voltage output by the charge management module 230 by the voltage conversion circuit 214 to obtain a fourth voltage, and transmit the fourth voltage to the battery 220 to charge the battery 220.

The third voltage output by the charge management module 230 may be obtained by the charge management module 230 based on the voltage provided by the power supply device 300.

In the case where the charge management module 230 is connected to the power supply device 300, the load 240 is powered by the power supply device 300, or is powered by the power supply device 300 and the battery 220, the voltage conversion module 210 can support bidirectional power transmission, and the power transmission direction of the voltage conversion module 210 can be switched. Further, the voltage conversion circuit 214 of the voltage conversion module 210 can operate in a second operation mode, in which the voltage conversion circuit 214 supports bi-directional power transmission, and in which one direction is voltage boosting and the other direction is voltage reducing.

In some embodiments, the power transmission direction of the voltage conversion module 210 may be automatically switched without being controlled by an additional controller, that is, without adding an additional switching device or a switching device to the voltage conversion module 210 to achieve the switching of the power transmission direction, and the power transmission direction of the voltage conversion module 210 is a natural switching process.

The voltage conversion module 210 may supply power to the load 240 based on the voltage and/or current provided by the power supply device 300 by the charge management module 230 in the case that the charge management module 230 is connected to the power supply device 300. In the case that the power supply current required by the load 240 is greater than the current output by the charge management module 230, it may be considered that the current provided by the power supply device 300 cannot meet the power supply requirement of the load 240, and then the load 240 draws current from the second end of the voltage conversion module 210, the energy transmission direction of the voltage conversion module 210 is switched to the first direction, and the battery 220 is in a discharging state. When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, the voltage conversion circuit 214 does not work, the first voltage output by the battery 220 is directly transmitted to the charge management module 230 and the load 240 through the bypass circuit 212, and the first voltage and the third voltage output by the charge management module 230 jointly supply power to the load 240, that is, the battery 220 and the power supply device 300 jointly supply power to the load 240. When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the voltage conversion circuit 214 operates, the first voltage output by the battery 220 is boosted by the voltage conversion circuit 214, and the load 240 is supplied with power based on the boosted second voltage and the third voltage output by the charge management module 230, that is, the battery 220 and the power supply device 300 supply power to the load 240 together.

Alternatively, in case that the battery 220 and the power supply apparatus 300 supply power to the load 240 together, the voltage (first voltage or second voltage) output by the voltage conversion module 210 may be the same as the third voltage output by the charge management module 230, thereby improving the stability of the power supply circuit 200.

Alternatively, in the case where the battery 220 and the power supply device 300 together supply power to the load 240, the current output by the battery 220 through the voltage conversion module 210 may be different from the current output by the power supply device 300 through the charge management module 230, and the current output by the power supply device 300 through the charge management module 230 may be greater than the current output by the battery 220 through the voltage conversion module 210. Since the battery 220 is in a low-power condition with a high probability in the case that the charge management module 230 is connected to the power supply device 300, the power supply current required by the load 240 can be mainly supplied by the power supply device 300, so as to avoid overdischarging the battery 220, damaging the battery 220, and affecting the service life of the battery 220.

In the case where the power supply current required by the load 240 is smaller than the current output by the charge management module 230, it can be considered that the current supplied by the power supply apparatus 300 can satisfy the power supply requirement of the load 240, and the load 240 is directly supplied with power by the power supply apparatus 300. Further, the third voltage output by the charging management module 230 supplies power to the load 240, and simultaneously, the battery 220 is charged by the voltage conversion module 210. The energy transmission direction of the voltage conversion module 210 is switched from the first direction to the second direction, and the battery 220 is in a charged state.

In the case where the battery 220 is in the charged state, if the battery voltage of the battery 220 is greater than the first voltage threshold, the voltage difference between the third voltage output by the charge management module 230 and the battery voltage of the battery 220 is small, the bypass circuit 212 may be turned on, the voltage conversion circuit 214 does not operate, the third voltage output by the charge management module 230 is directly transmitted to the battery 220 through the bypass circuit 212 to charge the battery 220, and the charged voltage of the battery 220 may be equal to the third voltage output by the charge management module 230.

The voltage conversion circuit 214 has a step-down function, and the power transmission direction corresponding to the step-down function is opposite to the power transmission direction corresponding to the step-up function. When the battery 220 is in a charged state, if the battery voltage of the battery 220 is not greater than the first voltage threshold, and the voltage difference between the third voltage output by the charge management module 230 and the battery voltage of the battery 220 is greater, the bypass circuit 212 may be turned off, the voltage conversion circuit 214 operates, the voltage conversion circuit 214 steps down the third voltage output by the charge management module 230 to obtain a fourth voltage, and the battery 220 is charged based on the fourth voltage. The charging voltage of the battery 220 is less than the third voltage output by the charge management module 230.

Alternatively, the step-down ratio of the voltage conversion circuit 214 may be fixed, for example, the step-down ratio of 2:1, 3:1, 3:2 (referring to the ratio between the input voltage and the output voltage of the voltage conversion circuit 214), or alternatively, the step-down ratio of the voltage conversion circuit 214 may be dynamically changed, and may be dynamically adjusted according to the third voltage output by the charge management module 230 and the charging voltage required by the battery 220.

Under the condition that the battery 220 is in a charged state, if the battery voltage of the battery 220 is not greater than the first voltage threshold, the voltage conversion circuit 214 is used to step down the third voltage output by the charge management module 230, so that when the battery 220 with low power is charged, the power supply voltage of the load 240 can be ensured to still maintain a larger voltage, the battery 220 with low power can be charged, the power supply voltage of the load 240 can not be influenced, and the risk of power failure of the load 240 is prevented.

Since the voltage conversion circuit 214 needs to support bi-directional power transfer in the second operation mode, the operation frequency of the voltage conversion circuit 214 may be relatively large, i.e., the switching devices in the voltage conversion circuit 214 may be switched back and forth between on and off at a relatively large frequency. Further, the operating frequency of the voltage conversion circuit 214 in the first operating mode is less than the operating frequency in the second operating mode. For example, the operating frequency of the voltage conversion circuit 214 in the second operating mode may be, but is not limited to, 500KHz, 800KHz, 1MHz (megahertz), etc. The voltage conversion circuit 214 operates in the second operation mode with a higher operation frequency, and can adjust the power transmission direction according to the requirement of the load 240 in time, so as to improve the timeliness and flexibility of the battery 220 in switching between the charging state and the discharging state.

In the embodiment of the present application, the voltage conversion module 210 can support bidirectional power transmission, and can flexibly switch the power transmission direction under the condition that the charging management module 230 is connected to the power supply device 300, so as to meet the power supply requirement of the load 240, and can realize charging of the battery 220, thereby improving the flexibility of use of the voltage conversion module 210.

As shown in fig. 3, in one embodiment, the charge management module 230 may include a charge interface 232, and the charge interface 232 may be used to connect to the power supply 300. The voltage conversion module 210 may also include a detection port 216, which detection port 216 may be connected with the charging interface 232.

The detection port 216 is configured to detect whether the charging interface 232 is connected to the power supply device 300.

In the case where the charging interface 232 is not connected to the power supply apparatus 300, the charging interface 232 has no voltage and/or current input, and the detection port 216 does not receive the voltage from the charging interface 232, and thus, it may be determined that the charging interface 232 is not connected to the power supply apparatus 300. In the case where the charging interface 232 is connected to the power supply apparatus 300, the charging interface 232 receives the voltage and/or the voltage supplied from the power supply apparatus 300, and the detection port 216 receives the voltage from the charging interface 232, and thus, it can be determined that the charging interface 232 is connected to the power supply apparatus 300.

Further, in the case where the detection port 216 does not receive the voltage from the charging interface 232, the detection port 216 may output a first level signal, and in the case where the detection port 216 receives the voltage from the charging interface 232, the detection port 216 may output a second level signal, for example, the first level signal may be a low level signal and the second level signal may be a high level signal, or the first level signal may be a high level signal and the second level signal may be a low level signal. The voltage conversion module 210 may control the voltage conversion circuit 214 to operate in a first operation mode and the battery 220 to be in a discharge state when the first level signal output from the detection port 216 is acquired, and may control the voltage conversion circuit 214 to operate in a second operation mode and the battery 220 to be in a discharge state or a charge state when the second level signal output from the detection port 216 is acquired. The voltage conversion module 210 accurately detects whether the charging interface 232 is connected to the power supply device 300 through the detection port, and flexibly switches the working modes of the voltage conversion circuit 214, so that the flexibility and the accuracy of switching the voltage conversion circuit 214 between the first working mode and the second working mode are improved.

In some embodiments, the charge management module 230 may further include a charge management unit 234, and the charge management unit 234 may be connected to the charge interface 232, the bypass circuit 212 and the voltage conversion circuit 214 in the voltage conversion module 210, and the load 240, respectively. Further, a first terminal of the charge management unit 234 may be connected to the charge interface 232, a second terminal of the charge management unit 234 may be connected to a second terminal of the voltage conversion module 210 (i.e., to the bypass circuit 212 and the voltage conversion circuit 214), and a third terminal of the charge management unit 234 may be connected to the load 240. The first terminal of the charge management unit 234 may be an input terminal, the third terminal of the charge management unit 234 may be an output terminal, and the second terminal of the voltage conversion module 210 may be an input terminal or an output terminal.

The charging management unit 234 is configured to perform conversion processing on the voltage provided by the power supply device 300, obtain a third voltage, and output the third voltage to the load 240 and/or the battery 220.

In the case where the charging interface 232 is connected to the power supply apparatus 300, the voltage supplied by the power supply apparatus 300 is transmitted to the charging management unit 234 via the charging interface 232. The charge management unit 234 may include a DC-DC circuit, a charge pump circuit, etc., and the charge management unit 234 may perform conversion processing on the voltage supplied from the power supply device 300 to obtain a third voltage. When the battery 220 is in a discharge state, the charge management unit 234 outputs a third voltage to the load 240, and supplies power to the load 240 together with the battery 220. When the battery 220 is in a charged state, the charge management unit 234 outputs the third voltage to the load 240 and the voltage conversion module 210, respectively, and charges the battery 220 through the voltage conversion module 210 while supplying power to the load 240.

Alternatively, in the case that the charging interface 232 is not connected to the power supply apparatus 300, the charging management module 230 may be powered by the battery 220, and in the case that the charging interface 232 is connected to the power supply apparatus 300, the charging management module 230 may be powered by the power supply apparatus 300, thereby ensuring the normal operation of the charging management module 230.

The charge management unit 234 may perform conversion processing on the voltage supplied from the power supply device 300, may perform voltage boosting processing, may perform voltage dropping processing, and may be determined according to the power supply voltage required by the load and the voltage supplied from the power supply device 300. The voltage provided by the power supply device 300 can be converted into the power supply voltage required by the load 240 through the charging management unit 234, so that the normal operation of the load 240 is ensured, and the charging of the battery 220 can be realized.

Illustratively, fig. 4 is a circuit schematic of a power supply circuit in one embodiment. As shown in fig. 4, voltage conversion module 210 may include bypass circuit 212, voltage conversion circuit 214, and detection port Vbus. The charge management module 230 includes a charge interface 232 and a charge management unit 234, and the charge management unit 234 includes a charge DC-DC circuit and a BAT FET, an input of the charge DC-DC circuit being connected to the charge interface 232. The first terminal of the BAT FET is connected to the bypass circuit 212 and the voltage conversion circuit 214 of the voltage conversion module 210, and the second terminal of the BAT FET is connected to the output terminal of the charging DC-DC circuit and the load 240.

In the case where the charging interface 232 is not connected to the power supply apparatus 300, the BAT FET of the charging management unit 234 is turned on and the BAT FET is in the first transmission direction (power is transmitted from the first terminal of the BAT FET to the second terminal of the BAT FET), and the charging DC-DC circuit of the charging management unit 234 does not operate. The first voltage (Vbat) output by the battery 220 is transmitted to the charge management module 230 via the voltage conversion module 210, and then transmitted to the load 240 via the BAT FET to power the load 240. Further, when the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, and the voltage Vsys transmitted to the load 240 may be equal to the first voltage Vbat provided by the battery 220, ignoring the voltage drop generated by the line. Further, when the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 is turned off, the voltage conversion circuit 214 boosts the first voltage Vbat provided by the battery 220 to obtain a second voltage, and the voltage Vsys transmitted to the load 240 is equal to the second voltage outputted by the voltage conversion circuit 214, so as to ensure the normal operation of the load 240.

In the case where the charging interface 232 is connected to the power supply 300, if the power supply current required by the load 240 is small, the BAT FET of the charging management unit 234 is turned on and is in the second transmission direction (the transmission of electric energy from the second end of the BAT FET to the first end of the BAT FET), and the load 240 is supplied with power by the power supply 300 alone. The voltage input from the power supply device 300 through the charging interface 232 is converted by the charging DC-DC circuit to obtain a third voltage, and the third voltage is output to the load 240, and is transmitted to the voltage conversion module 210 through the BAT FET, and then the battery 220 is charged through the voltage conversion module 210. Further, when the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass circuit 212 is turned on, and when the voltage drop generated by the circuit is ignored, the third voltage output by the charging DC-DC circuit is equal to the charging voltage of the battery 220, and when the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass circuit 212 cuts off the voltage reduction of the third voltage output by the charging DC-DC circuit through the voltage conversion circuit 214 to obtain a fourth voltage, and then the fourth voltage is transmitted to the battery 220 to charge the battery 220, so that the normal operation of the load 240 is ensured while the battery 220 is charged.

In the case that the charging interface 232 is connected to the power supply device 300, if the power supply current required by the load 240 is large, the BAT FET of the charging management unit 234 is turned on and is in the first transmission direction, and the load 240 is supplied with power through the battery 220 and the power supply device 300 together. The first voltage (Vbat) output from the battery 220 is transmitted to the charge management module 230 through the voltage conversion module 210, and then transmitted to the load 240 through the BAT FET, and the voltage input from the power supply device 300 through the charge interface 232 is converted by the charge DC-DC circuit to obtain a third voltage, and then output to the load 240.

As shown in fig. 6, in some embodiments, the voltage conversion module 210 further includes a control unit 218, where the control unit 218 may be connected to the bypass circuit 212 and the voltage conversion circuit 214, respectively, and the control unit 218 may control the on/off of the bypass circuit 212 and may also control the operation state of the voltage conversion circuit 214.

And a control unit 218 for controlling the bypass circuit 212 to be turned on and controlling the voltage conversion circuit 214 to be not operated when the battery voltage of the battery 220 is greater than the first voltage threshold value, and controlling the bypass circuit 212 to be turned off and controlling the voltage conversion circuit 214 to be operated when the battery voltage of the battery 220 is less than or equal to the first voltage threshold value.

The control unit 218 may acquire the battery voltage of the battery 220 and determine whether the battery voltage of the battery 220 is greater than a first voltage threshold. If the battery voltage of the battery 220 is greater than the first voltage threshold, the control unit 218 may control the bypass circuit 212 to be turned on and control the voltage conversion circuit 214 to be disabled, further, the control unit 218 may control the voltage conversion circuit 214 to be disabled, or the control unit 218 may control all switching devices in the voltage conversion circuit 214 to be in an off state, and the control unit 218 may not input a driving signal to the voltage conversion circuit 214. If the battery voltage of the battery 220 is not greater than the first voltage threshold, the control unit 218 may control the bypass circuit 212 to be turned off and control the voltage conversion circuit 214 to operate. Further, the control unit 218 may control the voltage conversion circuit 214 to operate, which may include the control unit 218 controlling the voltage conversion circuit 214 to be in the first operation mode or the second operation mode, and may further control the operating frequency and/or the duty cycle of the voltage conversion circuit 214.

As an embodiment, the power supply circuit 200 may further include a second voltage sampling module 250, and the second voltage sampling module 250 may be connected to the first end of the voltage conversion module 210 and the control unit 218, respectively. The second voltage sampling module 250 may collect the voltage at the first end of the voltage transformation module 210 to obtain a second voltage sampling signal, which may be used to characterize the voltage at the first end of the voltage transformation module 210, i.e., to characterize the battery voltage of the battery 220.

The second voltage sampling signal may be equal to the voltage of the first terminal of the voltage transformation module 210, or may be a voltage signal obtained by dividing the voltage of the first terminal of the voltage transformation module 210.

The second voltage sampling module 250 may transmit a second voltage sampling signal to the control unit 218, and the control unit 218 may determine whether the battery voltage of the battery 220 is greater than the first voltage threshold according to the second voltage sampling signal, since the voltage of the first terminal of the voltage conversion module 210 is equal to the battery voltage of the battery 220 or is very close to the battery voltage of the battery 220. Optionally, the second voltage sampling signal is equal to the voltage at the first end of the voltage conversion module 210, the control unit 218 may convert the second voltage sampling signal into a voltage value through an analog-to-digital converter, where the voltage value is the battery voltage of the battery 220, and may compare the voltage value with the first voltage threshold and determine whether the voltage value is greater than the first voltage threshold. In this manner, it may be more accurately determined whether the battery voltage of battery 220 is greater than the first voltage threshold.

Alternatively, the second voltage sampling signal may be a voltage signal obtained by dividing the voltage of the first end of the voltage conversion module 210, and the control unit 218 may compare the second voltage sampling signal with a first reference voltage, which may be generated according to a first voltage threshold, if the second voltage sampling signal is determined to be greater than the first reference voltage by the comparator, it is indicated that the battery voltage of the battery 220 is greater than the first voltage threshold, and if the second voltage sampling signal is determined to be not greater than the first reference voltage by the comparator, it is indicated that the battery voltage of the battery 220 is not greater than the first voltage threshold. In this way, the circuit is simpler and the complexity of the circuit can be reduced.

The manner in which the control unit 218 determines whether the battery voltage of the battery 220 is greater than the first voltage threshold value based on the second voltage sampling signal is not limited to the above-described several manners, and may be determined in other manners. The voltage conversion module 210 can accurately control the on/off of the bypass circuit 212 and the working state of the voltage conversion circuit 214 through the control unit 218, so as to improve the operation accuracy of the voltage conversion module 210.

In some embodiments, the control unit 218 may also be connected to the detection port 216. The control unit 218 may control the operation mode of the voltage conversion circuit 214 according to the level signal output from the detection port 216. In the case that the detection port 216 outputs the first voltage signal to the control unit 218, indicating that the charging interface 232 is not connected to the power supply device 300, the control unit 218 may control the voltage conversion circuit 214 to be in the first operation mode if the battery voltage of the battery 220 is not greater than the first voltage threshold. In the case that the detection port 216 outputs the second voltage signal to the control unit 218, indicating that the charging interface 232 is connected to the power supply device 300, the control unit 218 may control the voltage conversion circuit 214 to be in the second operation mode if the battery voltage of the battery 220 is not greater than the first voltage threshold.

In some embodiments, to ensure stability of the power supply to the load 240, the voltage at the second terminal of the voltage conversion module 210 may be maintained. As shown in fig. 6, the power supply circuit 200 further includes a first voltage sampling module 260, and the first voltage sampling module 260 is respectively connected to the second end of the voltage conversion module 210 and the control unit 218.

The first voltage sampling module 260 is configured to collect a voltage at the second end of the voltage conversion module 210, and obtain a first voltage sampling signal.

The control unit 218 is configured to generate a driving signal for the voltage conversion circuit 214 according to the first voltage sampling signal and the target voltage when the battery voltage of the battery 220 is less than or equal to the first voltage threshold, and drive the voltage conversion circuit 214 to operate according to the driving signal, so as to maintain the voltage at the second end of the voltage conversion module 210 at the target voltage.

The first voltage sampling module 260 may collect the voltage at the second end of the voltage transformation module 210 to obtain a first voltage sampling signal. Further, the voltage at the second end of the voltage conversion module 210 may be collected by the first voltage sampling module 260 with the voltage conversion circuit 214 operating.

In the case where the battery 220 is in a discharge state, the voltage of the second terminal of the voltage conversion module 210 is equal to the output voltage of the voltage conversion module 210, and further, in the case where the voltage conversion circuit 214 operates, the voltage of the second terminal of the voltage conversion module 210 is equal to the second voltage obtained after the voltage is boosted by the voltage conversion circuit 214. In the case where the battery 220 is in a charged state, the voltage of the second terminal of the voltage conversion module 210 is equal to the third voltage output from the charge management module 230.

The first voltage sampling signal may be equal to the voltage of the second terminal of the voltage conversion module 210, or may be a voltage signal obtained by dividing the voltage of the second terminal of the voltage conversion module 210.

The first voltage sampling module 260 may transmit a first voltage sampling signal to the control unit 218, and the control unit 218 may implement closed-loop control of the voltage conversion circuit 214 according to the first voltage sampling signal and the target voltage. The control unit 218 may determine whether the voltage at the second end of the voltage conversion module 210 is equal to a target voltage according to the first voltage sampling signal and the target voltage, where the target voltage may be greater than or equal to a first voltage threshold, for example, the first voltage threshold is 3V, and the target voltage may be 4V, 5V, or the like, but is not limited thereto.

Optionally, the first voltage sampling signal is equal to the voltage at the second end of the voltage conversion module 210, the control unit 218 may convert the first voltage sampling signal into a voltage value through an analog-to-digital converter, where the voltage value is the voltage at the second end of the voltage conversion module 210, and may compare the voltage value with the target voltage, and generate the driving signal of the voltage conversion circuit 214 according to the comparison result.

Alternatively, the first voltage sampling signal may be a voltage signal obtained by dividing the voltage of the second terminal of the voltage conversion module 210. The control unit 218 may compare the first voltage sampling signal with a second reference voltage, which may be generated according to the target voltage, through a comparator, and may generate a driving signal of the voltage conversion circuit 214 according to a comparison result output from the comparator.

The driving signal of the voltage conversion circuit 214 may be used to drive at least a portion of the switching devices in the voltage conversion circuit 214 to conduct, the driving signal of the voltage conversion circuit 214 may include, but is not limited to, PWM (Pulse width modulation ) signals, etc., the control unit 218 may determine the duty cycle of the PWM signal according to the first voltage sampling signal and the target voltage, and by adjusting the duty cycle of the PWM signal input to the voltage conversion circuit 214, the voltage at the second terminal of the voltage conversion circuit 214 (i.e., the second terminal of the voltage conversion module 210) may be made to approach the target voltage.

Illustratively, as shown in fig. 7, the control unit 218 may implement closed-loop control of the voltage conversion circuit 214 according to the first voltage sampling signal and the target voltage, and adjust the duty ratio of the PWM signal input to the voltage conversion circuit 214. For example, when the voltage at the second terminal of the voltage conversion circuit 214 is determined to be greater than the target voltage based on the first voltage sampling signal and the target voltage, the duty ratio of the PWM signal may be reduced, the voltage at the second terminal of the voltage conversion circuit 214 may be reduced, and when the voltage at the second terminal of the voltage conversion circuit 214 is determined to be less than the target voltage based on the first voltage sampling signal and the target voltage, the duty ratio of the PWM signal may be increased, and the voltage at the second terminal of the voltage conversion circuit 214 may be increased such that the voltage at the second terminal of the voltage conversion circuit 214 approaches the target voltage.

For another example, when the voltage at the second terminal of the voltage conversion circuit 214 is determined to be greater than the target voltage based on the first voltage sampling signal and the target voltage, the duty ratio of the PWM signal may be increased, the voltage at the second terminal of the voltage conversion circuit 214 may be decreased, and when the voltage at the second terminal of the voltage conversion circuit 214 is determined to be less than the target voltage based on the first voltage sampling signal and the target voltage, the duty ratio of the PWM signal may be decreased, and the voltage at the second terminal of the voltage conversion circuit 214 may be increased so that the voltage at the second terminal of the voltage conversion circuit 214 approaches the target voltage. The relationship between the duty cycle of the PWM signal and the voltage at the second terminal of the voltage conversion circuit 214 is affected by the specific circuit topology of the voltage conversion circuit 214 and is not limited herein.

In the embodiment of the present application, the voltage conversion module 210 implements closed-loop control on the voltage conversion circuit 214 through the control unit 218 based on the first voltage sampling signal and the target voltage, so that when the battery voltage of the battery 220 is smaller, the voltage at the second end of the voltage conversion module 210 is maintained at the target voltage, the working stability of the load 240 is ensured, the situation that the load 240 cannot work normally is prevented, and the stability of the system operation is improved.

In some embodiments, the voltage conversion circuit 214 may include one or more phases of boost circuits, which may be connected in parallel, and the output power of the voltage conversion circuit 214 may be increased by connecting the multiple phases of boost circuits in parallel. Alternatively, in the case where the battery voltage of the battery 220 is less than or equal to the first voltage threshold, the multi-phase voltage boosting circuit may operate in phase, and the control manner of the voltage conversion circuit 214 may be simplified.

Alternatively, the multi-phase boost circuit may operate in a phase-error condition where the battery voltage of battery 220 is less than or equal to the first voltage threshold. Further, the target phase is set between the adjacent two phases of the boost circuits, alternatively, the target phase may be a preset fixed phase, for example, the target phase may be set between the adjacent two phases of the boost circuits by 60 degrees, and the target phase may also be determined according to the number of phases of the boost circuits. For example, the target phase may be equal to 360 ° divided by the number of phases of the booster circuit, if the number of phases of the booster circuit is 2, the target phase may be 180 °, if the number of phases of the booster circuit is 3, the target phase may be 120 °, etc., but is not limited thereto. The multi-phase boost circuit operates in a phase-shifting manner, which can reduce voltage ripple output by the voltage conversion circuit 214 and enhance transient response capability.

Further, the boost circuit may include an inductor and a switch group, the inductor is connected with the switch group, each switch in the switch group is switched between on and off, and the inductor charges, stores energy or discharges and releases energy to maintain stability of voltage output by the boost circuit.

Alternatively, a scheme of coupling inductance can be adopted for the multiphase boost circuit which works in a wrong phase, and the inductance included in the boost circuit of each adjacent two phases is coupled to form the coupling inductance. The coupling inductor can comprise a first coil and a second coil, and the inductances in the boost circuits of the adjacent two phases are respectively the first coil and the second coil. The two inductances included in the boost circuits of adjacent two phases may be integrated as one coupled inductance. By adopting the scheme of coupling the inductors, the inductor packaging can be reduced, and the working efficiency of the voltage conversion circuit 214 can be improved.

Fig. 8A is a circuit diagram of the voltage conversion circuit 214 in one embodiment. As an embodiment, as shown in fig. 8A, the voltage conversion circuit 214 may include a four-phase boost circuit and a bypass circuit 212, where the bypass circuit 212 includes a bypass switch QP, and the four-phase boost circuits are connected in parallel.

Each phase of boost circuit comprises an inductor L2 and a switch group, the switch group comprises a first switch Q11 and a second switch Q12, the connection midpoint of the first switch Q11 and the second switch Q12 is connected with a first end of the inductor L2, and a second end of the inductor L2 is connected with a battery 220.

When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass switch QP is turned on and the four-phase boost circuit does not operate.

When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass switch QP is turned off and the four-phase boosting circuit operates. When the battery 220 is in a discharging state, the first switch Q11 and the second switch Q12 can be switched between on and off, when the second switch Q12 is on and the first switch Q11 is off, the inductor L2 charges and stores energy, when the second switch Q12 is off and the first switch Q11 is on, the inductor L2 discharges and releases energy, so that the boosting treatment of the first voltage (namely Vbat) provided by the battery 220 is realized. When the battery 220 is in a charged state, the first switch Q11 and the second switch Q12 can be switched between on and off, when the first switch Q11 is on and the second switch Q12 is off, the inductor L2 charges and stores energy, and when the first switch Q11 is off and the second switch Q12 is on, the inductor L2 discharges and releases energy, so as to realize the step-down processing of the third voltage output by the charge management module 230.

Further, the control unit 218 may adjust the duty cycle of the boost circuit according to the first voltage sampling signal and the target voltage corresponding to the voltage (Vsys) at the second end of the voltage conversion circuit 214, where the duty cycle may refer to a proportion of the on-time period of the first switch Q11 to the period time period of the duty cycle in each working period, or the duty cycle may refer to a proportion of the on-time period of the second switch Q12 to the period time period of the duty cycle in each working period.

Optionally, the four-phase boost circuit may operate in a wrong phase, and the conduction time of the first switch Q11 in the adjacent two-phase boost circuit may be separated by a target phase, and/or the conduction time of the second switch Q12 in the adjacent two-phase boost circuit may be separated by a target phase, so as to reduce capacitive voltage ripple and enhance transient response capability.

Further, the four-phase boost circuit may employ a coupling inductor, as shown in fig. 8B, two inductors L2 in the adjacent boost circuits may be a first coil and a second coil of one coupling inductor, respectively, and two inductors L2 in the adjacent boost circuits integrate one coupling inductor.

In the embodiment of the application, the voltage conversion circuit 214 shown in fig. 8A or 8B is adopted, so that the output power of the voltage conversion circuit 214 can be improved, the power consumption requirement of the whole electronic equipment can be met, the bidirectional electric energy transmission can be realized, the charge and discharge requirements of the battery 220 and the power supply requirement of the load 240 under different conditions can be met, and the cruising ability of the electronic equipment and the use experience of the battery 220 under low electric quantity can be improved.

Fig. 9A is a circuit diagram of the voltage conversion circuit 214 in another embodiment. As an embodiment, as shown in fig. 9A, the voltage conversion circuit 214 may include a two-phase boost circuit and a bypass circuit 212, where the bypass circuit 212 includes a bypass switch QP, and the two-phase boost circuits are connected in parallel.

Each phase of boost circuit comprises an inductor L3, a switch group and a first capacitor C1, wherein the first capacitor C1 can be connected with the switch group and a first end of the inductor L3 respectively, and a second end of the inductor L3 is connected with the charging management module 230. Each switch in the switch group is switched between on and off, and the first capacitor C1 charges, stores or discharges, and releases energy, so that the voltage at the first end of the inductor L3 is greater than or equal to the battery voltage of the battery 220. The voltage of the first end of the inductor L3 can be changed by charging or discharging the first capacitor C1 to store energy, so that the voltage of the first end of the inductor L3 is greater than or equal to the battery voltage of the battery 220. When the battery 220 is in a discharging state, under the condition that the output power of the boost circuit is unchanged, the average voltage of the first end of the inductor L3 in a working period is increased, so that the inductor current input to the inductor can be reduced, the volume of the inductor can be greatly reduced, the area of the boost circuit on a circuit board is reduced, and the cost is reduced.

Further, the switch group includes a third switch Q3, a fourth switch Q4, and a fifth switch Q5, where the third switch Q3, the fourth switch Q4, and the fifth switch Q5 are connected in series, a connection midpoint of the third switch Q3 and the fourth switch Q4 is connected to the battery 220, a connection midpoint of the fourth switch Q4 and the fifth switch Q5 is connected to a first end of the first capacitor C1, and the third switch Q3 is further connected to a first end of the inductor L3 and a second end of the first capacitor C1, respectively.

When the battery voltage of the battery 220 is greater than the first voltage threshold, the bypass switch QP is turned on and the two-phase boost circuit is not operated.

When the battery voltage of the battery 220 is not greater than the first voltage threshold, the bypass switch QP is turned off and the two-phase booster circuit operates. When the boost circuit is operating, the boost circuit may include two modes of operation, wherein during a first period of time in one operating cycle the boost circuit is in a first mode of operation and during a second period of time the boost circuit is in a second mode of operation.

When the battery 220 is in a discharging state, in a first period of the working cycle, the voltage boosting circuit is in a first working mode, the third switch Q3 and the fifth switch Q5 are turned on, the fourth switch Q4 is turned off, the first end of the first capacitor C1 is grounded through the fifth switch Q5, the first voltage provided by the battery 220 charges the first capacitor C1 and the inductor L3 through the third switch Q3, the first capacitor C1 is connected in parallel with the capacitor at the end of the battery 220, when the voltage at the second end of the first capacitor C1 (i.e., the voltage at the first end of the inductor L3) is equal to the first voltage provided by the battery 220 (i.e., vbat), and the capacitor voltage VC1 of the first capacitor C1 is equal to the first voltage output by the battery 220 (i.e., vbat) without considering loss.

In the second period of the duty cycle, the voltage boosting circuit is in the second working mode, the third switch Q3 and the fifth switch Q5 are turned off, the fourth switch Q4 is turned on, the first capacitor C1 is connected in series with the inductor L3, the first capacitor C1 and the inductor L3 are discharged, and the voltage at the first end of the inductor L3 is equal to the sum of the first voltage (Vbat) output by the battery 220 and the capacitor voltage VC1 of the first capacitor C1. Since the capacitor voltage VC1 of the first capacitor C1 is equal to the first voltage output by the battery 220 when the second period is entered, the voltage at the first terminal of the inductor L3 is equal to 2 times the first voltage output by the battery 220, that is, the voltage v1=2×vbat at the first terminal of the inductor L3.

Assuming that the duty cycle of the boost circuit in the first and second operation modes is D and 1-D, respectively, in one operation cycle, vsys=vbat×d+2vbat×1-d=vbat×2-D can be obtained based on the principle of volt-second balance of inductance, where 0< D <1.

Further, the control unit 218 may adjust the duty ratio of the boost circuit according to the first voltage sampling signal and the target voltage corresponding to the voltage (i.e., vsys) of the second end of the voltage conversion circuit 214, so as to change the Vsys between Vbat and Vbat 2 times.

The boost circuit operates on a similar principle when battery 220 is in a charged state as when battery 220 is in a discharged state, and may still adjust duty cycle D by the formula vsys=vbat×d+2vbat× (1-D) =vbat×2-D to achieve a change in Vsys between Vbat and 2 times Vbat, although Vbat may be considered the charging voltage input to battery 220 when battery 220 is in a charged state.

Optionally, the two-phase boost circuits may operate in a wrong phase, and the conduction moments of the third switch Q3 in the adjacent two-phase boost circuits may be separated by a target phase, and/or the conduction moments of the fourth switch Q4 in the adjacent two-phase boost circuits may be separated by a target phase, so as to reduce capacitive voltage ripple and enhance transient response capability.

Further, the four-phase boost circuit may employ a coupling inductor, as shown in fig. 9B, two inductors L3 in the adjacent boost circuits may be a first coil and a second coil of one coupling inductor, respectively, and two inductors L3 in the adjacent boost circuits integrate one coupling inductor.

In the embodiment of the application, the voltage conversion circuit 214 shown in fig. 9A or 9B is adopted, so that the output power of the voltage conversion circuit 214 can be improved, the power consumption requirement of the whole electronic equipment is met, the bidirectional electric energy transmission can be realized, the charge and discharge requirements of the battery 220 and the power supply requirement of the load 240 under different conditions are met, and the endurance of the electronic equipment and the use experience of the battery 220 under low electric quantity are improved.

It should be noted that, the connection midpoint provided in the above embodiment refers to any node on the connection circuit of two devices connected in series, which may be used for connection with other circuits or electronic devices, and is not necessarily a center point of the connection circuit between the two devices, for example, the connection midpoint of the third switch Q3 and the fourth switch Q4 may be any node on the connection circuit of the third switch Q3 and the fourth switch Q4, and is not necessarily a center point of the connection circuit between the third switch Q3 and the fourth switch Q4.

The switching devices (e.g., the first switch Q11, the second switch Q12, the bypass switch QP, the third switch Q3, etc.) involved in the above embodiments may include, but are not limited to, one or more of MOS transistors, gaN (gallium nitride) switches, siC (silicon carbide) switches, etc. The MOS tube can be an N-type MOS tube or a P-type MOS tube.

In some embodiments, the boost module is still required to supply power for the first load of high UVLO due to the limited boost capability of the voltage conversion circuit 214 in the voltage conversion module 210. As shown in fig. 10, the power supply circuit may further include a boost module 270, which may be connected to the output of the charge management module 230 and the first load.

The boost module 270 is configured to boost the voltage output by the charge management module 230 to obtain a fifth voltage when the voltage output by the charge management module 230 is less than a second voltage threshold, where the second voltage threshold is greater than the first voltage threshold, and the fifth voltage is used to supply power to the first load.

In the case that the charging management module 230 is not connected to the power supply device 300, the voltage output by the charging management module 230 may be equal to the voltage output by the voltage conversion module 210 if line loss is not considered. In the case where the charge management module 230 is connected to the power supply device 300, the voltage output by the charge management module 230 may be the third voltage in the above embodiments.

Further, the boost module 270 may include a bypass switch and a boost circuit, the bypass switch being connected in parallel with the boost circuit.

In the case that the voltage output by the charging management module 230 is greater than the second voltage threshold, which indicates that the voltage output by the charging management module 230 can meet the power supply requirement of the first load, the boost module 270 may turn on the bypass switch, the boost circuit does not work, the voltage output by the charging management module 230 is directly transmitted to the first load through the turned-on bypass switch, and the voltage output by the charging management module 230 is used to supply power to the first load.

In the case that the voltage output by the charging management module 230 is not greater than the second voltage threshold, which indicates that the voltage output by the charging management module 230 cannot meet the power supply requirement of the first load, the boost module 270 may turn off the bypass switch, the boost circuit works, and the boost circuit may boost the voltage output by the charging management module 230 to obtain a fifth voltage, and power the first load based on the fifth voltage.

It should be noted that, the bypass switch and the boost circuit in the boost module 270 may operate in a similar manner to that of the voltage conversion module 210 described in the above embodiment when the battery 220 is in the discharging state, and the description thereof is not repeated here.

The circuit topology of the boost module 270 may be a circuit topology as shown in fig. 1B, or the circuit topology of the boost module 270 may be a circuit topology as shown in fig. 8A or fig. 9A, and the boost circuit in the boost module 270 may be a single phase or a multi-phase, which is not limited herein.

Through combining voltage conversion module 210 with boost module 270, both can let battery 220 put battery voltage lower, reduce the restriction of use of battery 220 under low electric quantity, release the capacity of battery more, can guarantee the normal work of the first load of high UVLO again, improved electronic equipment's wholeness ability and use experience.

In some embodiments, embodiments of the present application also provide a power supply circuit 200, where the power supply circuit 200 may be the power supply circuit 200 described in any of the embodiments above.

In some embodiments, embodiments of the present application also provide a chip that may include the voltage conversion module 210 described in any of the embodiments above, or include the power supply circuit 200 described in any of the embodiments above.

In some embodiments, the present application further provides an electronic device, which may include the voltage conversion module 210 described in any of the above embodiments, or include the power supply circuit 200 described in any of the above embodiments, or include the chip described in any of the above embodiments.

Alternatively, the electronic device may include, but is not limited to, a cell phone, a wearable device, a tablet computer, a notebook computer, a smart home device, and the like.

As shown in fig. 11, in some embodiments, a voltage conversion method is provided, which may be applied to the voltage conversion module 210, or to the power supply circuit 200, or to the chip, or to the electronic device. The method may comprise the steps of:

In step 1110, in a case where the battery voltage of the battery is greater than the first voltage threshold, the first voltage provided by the battery is transmitted to the charge management module through the bypass circuit of the voltage conversion module to supply power to the load.

Step 1120, in case that the battery voltage of the battery is less than or equal to the first voltage threshold, performing boost processing on the first voltage provided by the battery through the voltage conversion circuit of the voltage conversion module to obtain a second voltage, and transmitting the second voltage to the charge management module to supply power to the load.

Under the condition that the charging management module is not connected with the power supply device, the electric energy transmission direction of the voltage conversion module is a first direction;

Under the condition that the charging management module is connected with the power supply device, the electric energy transmission direction of the voltage conversion module is a first direction or a second direction;

The first direction is a direction from the first end of the voltage conversion module to the second end of the voltage conversion module, and the second direction is a direction from the second end of the voltage conversion module to the first end of the voltage conversion module.

In some embodiments, step 1110 includes transmitting a first voltage provided by the battery to the charge management module via the bypass circuit to power the charge management module and the load if the battery voltage of the battery is greater than a first voltage threshold without the charge management module being connected to the power supply.

Step 1120 includes, under the condition that the charging management module is not connected to the power supply device, if the battery voltage of the battery is less than or equal to the first voltage threshold, performing boosting processing on the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmitting the second voltage to the charging management module to supply power to the charging management module and the load.

In some embodiments, the method further comprises transmitting the first voltage provided by the battery to the charge management module through the bypass circuit to supply power to the load together with the charge management module or transmitting the third voltage output by the charge management module to the battery through the bypass circuit to charge the battery if the battery voltage of the battery is greater than the first voltage threshold value when the charge management module is connected to the power supply device;

Under the condition that the charging management module is connected with the power supply device, if the battery voltage of the battery is smaller than or equal to a first voltage threshold value, the first voltage provided by the battery is boosted through the voltage conversion circuit to obtain a second voltage, the second voltage is transmitted to the charging management module to supply power for a load together with the charging management module, or the third voltage output by the charging management module is subjected to voltage reduction through the voltage conversion circuit to obtain a fourth voltage, and the fourth voltage is transmitted to the battery to charge the battery.

In some embodiments, the method further comprises controlling the voltage conversion circuit to be in a first operating mode when the charging management module is not connected to the power supply device, controlling the voltage conversion circuit to be in a second operating mode when the charging management module is connected to the power supply device, and controlling the operating frequency of the voltage conversion circuit in the first operating mode to be smaller than the operating frequency in the second operating mode.

In some embodiments, the method further comprises detecting, via a detection port of the voltage conversion module, whether a charging interface in the charging management module is connected to the power supply device.

In some embodiments, the method further comprises the steps of carrying out conversion processing on the voltage provided by the power supply device through a charging management unit in the charging management module to obtain a third voltage, and outputting the third voltage to the load and/or the battery when the charging interface is connected to the power supply device.

In some embodiments, the method further comprises the steps of acquiring the voltage of the second end of the voltage conversion module through the first voltage sampling module to obtain a first voltage sampling signal, generating a driving signal of the voltage conversion circuit according to the first voltage sampling signal and the target voltage under the condition that the battery voltage of the battery is smaller than or equal to a first voltage threshold value, and driving the voltage conversion circuit to work according to the driving signal so as to enable the voltage of the second end of the voltage conversion module to be maintained at the target voltage.

In some embodiments, the voltage conversion circuit includes a multi-phase boost circuit, and the method further includes controlling the multi-phase boost circuit to operate in a phase-error condition if the battery voltage of the battery is less than or equal to the first voltage threshold.

In some embodiments, the method further comprises controlling the bypass circuit to be turned on and controlling the voltage conversion circuit to be disabled when the battery voltage of the battery is greater than a first voltage threshold, and controlling the bypass circuit to be turned off and controlling the voltage conversion circuit to be enabled when the battery voltage of the battery is less than or equal to the first voltage threshold.

It should be noted that, the description of the voltage conversion method provided in the embodiments of the present application may refer to the related description in the voltage conversion module or the power supply circuit provided in each of the above embodiments, and the description is not repeated here.

In the embodiment of the application, the voltage conversion module is arranged between the battery and the charge management module, and when the battery voltage of the battery is smaller than or equal to the first voltage threshold value, the voltage conversion circuit of the voltage conversion module is used for boosting the first voltage output by the battery, and only the second voltage obtained by boosting is required to be ensured to be larger than the UVLO voltage of the charge management module and the load, so that the charge management module and the load can work normally, the battery can be enabled to lower the battery voltage, the use limit of the battery under low electric quantity can be reduced, the capacity of the battery is released more, and the cruising ability of electronic equipment provided with the battery is improved.

The embodiment of the application discloses an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to enable the electronic device to realize the method described in the above embodiments.

The embodiments of the present application disclose a computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method as described in the above embodiments.

Embodiments of the present application disclose a computer program product comprising a computer program which, when executed by a processor, implements the method as described in the above embodiments.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art will also appreciate that the embodiments described in the specification are alternative embodiments and that the acts and modules referred to are not necessarily required for the present application.

In various embodiments of the present application, it should be understood that the sequence numbers of the foregoing processes do not imply that the execution sequences of the processes should be determined by the functions and internal logic of the processes, and should not be construed as limiting the implementation of the embodiments of the present application.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The voltage conversion module, the power supply circuit, the chip, the electronic device and the voltage conversion method disclosed in the embodiments of the present application are described in detail, and specific examples are applied to illustrate the principles and the implementation of the present application, and the description of the above embodiments is only used to help understand the method and the core idea of the present application. Meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims

1. A voltage conversion module, characterized in that the voltage conversion module is applied to a power supply circuit, the power supply circuit further comprising a battery, a charging management module, and a load, the charging management module being connected to the load and being connected to a power supply device; a first end of the voltage conversion module being connected to the battery, and a second end of the voltage conversion module being connected to the charging management module;

The voltage conversion module includes:

Bypass circuit;

a voltage conversion circuit connected in parallel with the bypass circuit;

The voltage conversion module is used to transmit the first voltage provided by the battery to the charging management module through the bypass circuit to power the load when the battery voltage of the battery is greater than the first voltage threshold; and to boost the first voltage provided by the battery through the voltage conversion circuit to obtain a second voltage, and transmit the second voltage to the charging management module to power the load when the battery voltage of the battery is less than or equal to the first voltage threshold.

2. The voltage conversion module according to claim 1, wherein when the charging management module is not connected to the power supply device, the power transmission direction of the voltage conversion module is the first direction;

When the charging management module is connected to the power supply device, the power transmission direction of the voltage conversion module is the first direction or the second direction;

3. The voltage conversion module according to claim 2, characterized in that:

The voltage conversion module is further configured to, when the charging management module is not connected to the power supply device, transmit the first voltage provided by the battery to the charging management module via the bypass circuit if the battery voltage of the battery is greater than a first voltage threshold, so as to power the charging management module and the load;

When the charging management module is not connected to the power supply device, if the battery voltage of the battery is less than or equal to the first voltage threshold, the first voltage provided by the battery is boosted by the voltage conversion circuit to obtain a second voltage, and the second voltage is transmitted to the charging management module to power the charging management module and the load.

4. The voltage conversion module according to claim 2, wherein:

The voltage conversion module is further configured to, when the charging management module is connected to the power supply device, transmit the first voltage provided by the battery to the charging management module through the bypass circuit if the battery voltage of the battery is greater than a first voltage threshold, so as to jointly power the load with the charging management module, or transmit the third voltage output by the charging management module to the battery through the bypass circuit through the bypass circuit, so as to charge the battery;

When the charging management module is connected to the power supply device, if the battery voltage of the battery is less than or equal to the first voltage threshold, the first voltage provided by the battery is boosted by the voltage conversion circuit to obtain a second voltage, and the second voltage is transmitted to the charging management module to jointly power the load with the charging management module, or the third voltage output by the charging management module is stepped down by the voltage conversion circuit to obtain a fourth voltage, and the fourth voltage is transmitted to the battery to charge the battery.

5. The voltage conversion module according to claim 2, wherein when the charging management module is not connected to the power supply device, the voltage conversion circuit is in the first working mode;

When the charging management module is connected to the power supply device, the voltage conversion circuit is in the second working mode;

The operating frequency of the voltage conversion circuit in the first operating mode is lower than the operating frequency in the second operating mode.

6. The voltage conversion module according to any one of claims 2 to 5, wherein the charging management module comprises a charging interface, and the charging interface is used to connect to the power supply device;

The voltage conversion module further includes a detection port, which is connected to the charging port;

The detection port is used to detect whether the charging interface is connected to the power supply device.

7. The voltage conversion module according to claim 6, wherein the charging management module further comprises a charging management unit, and the charging management unit is connected to the charging interface;

The charging management unit is configured to convert the voltage provided by the power supply device to obtain a third voltage, and output the third voltage to the load and/or the battery.

8. The voltage conversion module according to claim 1, wherein the power supply circuit further comprises a first voltage sampling module, the first voltage sampling module being configured to collect the voltage at the second end of the voltage conversion module to obtain a first voltage sampling signal;

The voltage conversion module further includes a control unit, which is connected to the first voltage sampling module;

The control unit is configured to generate a drive signal for the voltage conversion circuit based on the first voltage sampling signal and the target voltage when the battery voltage of the battery is less than or equal to the first voltage threshold, and drive the voltage conversion circuit to operate according to the drive signal so that the voltage at the second end of the voltage conversion module is maintained at the target voltage.

9. The voltage conversion module according to any one of claims 1 to 5 and 8, wherein the voltage conversion circuit comprises a multi-phase boost circuit, and the multi-phase boost circuits are connected in parallel;

When the battery voltage of the battery is less than or equal to the first voltage threshold, the multi-phase boost circuits operate in staggered phases.

10. The voltage conversion module according to claim 9, wherein the boost circuit comprises an inductor and a switch group, the inductor is connected to the switch group, each switch in the switch group switches between on and off, and the inductor charges to store energy or discharges to release energy to maintain the stability of the voltage output by the boost circuit;

In the multi-phase boost circuit, the inductors included in the boost circuits of each two adjacent phases are coupled to form a coupled inductor.

11. The voltage conversion module according to claim 10, wherein the switch group comprises a first switch and a second switch, and the first switch and the second switch are connected in series;

A connection midpoint between the first switch and the second switch is connected to a first end of the inductor, and a second end of the inductor is connected to the battery.

12. The voltage conversion module according to claim 10, wherein the boost circuit further comprises a first capacitor, wherein the first capacitor is connected to the switch group and a first end of the inductor respectively, and a second end of the inductor is connected to the charging management module;

Each switch in the switch group switches between on and off, and the first capacitor charges to store energy or discharges to release energy, so that the voltage at the first end of the inductor is greater than or equal to the battery voltage of the battery.

13. The voltage conversion module according to claim 12, wherein the switch group comprises a third switch, a fourth switch, and a fifth switch, the third switch, the fourth switch, and the fifth switch are connected in series, a midpoint between the third switch and the fourth switch is connected to the battery, and a midpoint between the fourth switch and the fifth switch is connected to the first end of the first capacitor;

The third switch is further connected to the first end of the inductor and the second end of the first capacitor respectively.

14. The voltage conversion module according to claim 1, further comprising a control unit, wherein the control unit is connected to the bypass circuit and the voltage conversion circuit respectively;

The control unit is configured to control the bypass circuit to be turned on and the voltage conversion circuit to be turned off when the battery voltage of the battery is greater than a first voltage threshold; and to control the bypass circuit to be turned off and the voltage conversion circuit to be turned on when the battery voltage of the battery is less than or equal to the first voltage threshold.

15. A power supply circuit, comprising:

The voltage conversion module according to any one of claims 1 to 14;

load;

a battery, configured to provide a first voltage to the voltage conversion module;

A charging management module is connected to the load, and the charging management module is used to connect to a power supply device.

16. The power supply circuit according to claim 15, further comprising a boost module, wherein the boost module is connected to the charge management module and a first load respectively, wherein the first load is a load having an undervoltage lockout (UVLO) voltage greater than a UVLO threshold;

The boost module is used to boost the voltage output by the charging management module to obtain a fifth voltage when the voltage output by the charging management module is less than a second voltage threshold, and the fifth voltage is used to power the first load; the second voltage threshold is greater than the first voltage threshold.

17. A chip comprising the voltage conversion module according to any one of claims 1 to 14, or comprising the power supply circuit according to any one of claims 15 to 16.

18. An electronic device, characterized by comprising the voltage conversion module according to any one of claims 1 to 14, or the power supply circuit according to any one of claims 15 to 16, or the chip according to claim 17.

19. A voltage conversion method, characterized in that the method comprises:

When the battery voltage of the battery is greater than a first voltage threshold, the first voltage provided by the battery is transmitted to the charging management module through the bypass circuit of the voltage conversion module to power the load;

When the battery voltage of the battery is less than or equal to the first voltage threshold, the first voltage provided by the battery is boosted by the voltage conversion circuit of the voltage conversion module to obtain a second voltage, and the second voltage is transmitted to the charging management module to power the load.