CN111864868A - Fast charging charger, fast charging chip and control method of fast charging charger - Google Patents

Abstract

The application discloses a quick-charging charger, a quick-charging chip and a control method of the quick-charging charger, wherein the quick-charging charger comprises an AC-DC conversion circuit, a rechargeable battery, a universal USB interface for discharging and outputting, a quick-charging chip, a DC-DC boost circuit, an input switch and an output switch; the quick charging chip is used for detecting whether the AC-DC conversion circuit is connected with the AC voltage or not; detecting whether the discharging output USB interface is accessed by the useless electric equipment; and confirming whether the accessed electric equipment starts a quick charging protocol or not; and controlling the quick charging charger to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharging output USB interface and a preset control strategy, wherein the target state comprises one of the following states: the charging and discharging control system comprises a standby state, a slow charging state, a fast charging state, a slow discharging state, a fast discharging state, a slow charging and slow discharging state and a fast charging and discharging state. By adopting the embodiment of the application, the practicability of the quick charger can be improved.

Description

Fast charging charger, fast charging chip and control method of fast charging charger

technical field

The present application relates to the technical field of fast charging, and in particular, to a fast charging charger, a fast charging chip and a control method of the fast charging charger.

Background technique

At present, there is a rechargeable battery inside the mobile power supply device, which can not only charge the internal battery to store energy, but also charge other devices (such as mobile phones, etc.) through the battery, but the discharge output of the mobile power supply device can only be externally charged with a voltage of 5V. output, cannot support higher voltage fast charge and discharge.

SUMMARY OF THE INVENTION

The present application provides a fast charging charger, a fast charging chip and a control method for the fast charging charger.

In a first aspect, the present application provides a fast-charging charger, including an AC-DC conversion circuit, a rechargeable battery, a discharge output USB interface, a fast-charging chip, a DC-DC buck-boost circuit, an input switch, and an output switch;

The AC-DC conversion circuit is connected to the input end of the input switch and the fast charging chip; the output end of the input switch is connected to the input end of the output switch and the DC-DC boost and boost circuit; the The control end of the input switch and the control end of the output switch are connected to the fast charge chip; the output end of the output switch is connected to the discharge output USB interface; the DC-DC boost and voltage circuit is also connected to the fast charge a chip and the rechargeable battery; the discharge output USB interface is also connected to the fast charging chip;

The AC-DC conversion circuit is used to convert the connected alternating current into direct current, and under the control of the fast charging chip, output the direct current to the DC-DC buck-boost circuit or the discharge output Electrical equipment connected to the USB interface;

The DC-DC buck-boost circuit is used to convert the DC voltage output by the AC-DC conversion circuit into a battery voltage to charge the rechargeable battery under the control of the fast charging chip, or to charge the rechargeable battery. The battery voltage output by the rechargeable battery is converted into a DC voltage to supply power to the electrical equipment;

The fast charging chip is used to detect whether the AC-DC conversion circuit is connected to an AC voltage; and, to detect whether the discharge output USB interface is connected to the electrical device; and, to confirm the connected Whether the electrical device has enabled the fast charging protocol; and, according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, the fast charging charger is controlled to enter the target state, the target The status includes one of the following: standby status, slow charging status, fast charging status, slow discharging status, fast discharging status, slow charging and slow discharging status, and fast charging and discharging status.

In an implementation manner, the fast charging chip includes a control state machine programmed with the preset control strategy, and a load detection module, a protocol identification module, and an AC-DC detection control module independently connected to the control state machine. , DC-DC buck-boost detection control module, input switch control module and output switch control module;

The load detection module and the protocol identification module are connected to the discharge output USB interface; the AC-DC detection control module is connected to the AC-DC conversion circuit; the DC-DC buck-boost detection control module is connected to the DC-DC buck-boost circuit; the input switch control module is connected to the input switch; the output switch control module is connected to the output switch;

The load detection module is used to detect whether the discharge output USB interface is plugged or unplugged with an electrical device, and input the detected load detection signal to the control state machine;

The protocol identification module is used to identify whether the electrical device connected to the discharge output USB interface has a fast charging protocol, and input the identified charging protocol identification signal to the control state machine;

The AC-DC detection control module is used to detect whether the AC-DC conversion circuit has access to an AC power supply, and input the detected power supply connection signal to the control state machine;

The control state machine is configured to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power supply connection signal, and the preset control strategy.

In an implementation manner, the preset control strategy includes:

If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, controlling the fast charging charger to enter a standby state;

If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state, and in the slow charging state, the control state machine passes the AC power - The DC detection control module controls the AC-DC conversion circuit to output a default DC voltage, and the control state machine controls the DC-DC boost and boost circuit for the rechargeable battery through the DC-DC boost and boost detection control module. Charge;

If in the slow charge state, and the discharge output USB interface is not connected to the electrical device, the fast charge charger is controlled to enter the fast charge state, and in the fast charge state, the control state machine passes the The AC-DC detection control module controls the AC-DC conversion circuit to output a fast charging voltage, and the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to be The rechargeable battery is fast-charged;

If in the standby state, and the power is turned on through a button or the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter a slow discharge state, and in the slow discharge state, the control state The machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electrical equipment;

If in the slow discharge state, the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast discharge state, and in the fast discharge state, the control state The machine controls the DC-DC buck-boost circuit to perform fast charging for the electrical equipment through the DC-DC buck-boost detection control module;

If in the slow charge state, and the discharge output USB interface is connected to the electrical equipment, the fast charge charger is controlled to enter the slow charge and slow discharge state, and in the slow charge and slow discharge state, the control The state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to supply the electricity for the power consumption. The device is normally charged;

If in the fast charging state, and the discharge output USB interface is connected to an electrical device, controlling the fast charging charger to enter the slow charging and slow discharging state;

If in the slow charge and slow discharge state, and if the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast charge and discharge state, and in the fast charge In the charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch control module through the input switch control module. an input switch to fast charge the electrical equipment;

If in the fast-discharging state, the AC-DC conversion circuit is connected to an AC power supply, the fast-charging charger is controlled to enter the fast-charging-while-charging-while-discharging state.

In an implementation manner, the DC-DC buck-boost circuit includes a first MOS transistor, a second MOS transistor, a first resistor, and a first inductor;

The source of the first MOS transistor is connected to the output end of the input switch, the gate of the first MOS transistor is connected to the DC-DC boost voltage detection control module, and the drain of the first MOS transistor is connected to One end of the first inductor, and the other end of the first inductor is connected to the rechargeable battery;

Both ends of the first resistor are connected in parallel between the source and the gate of the first MOS transistor;

The source of the second MOS transistor is grounded, the drain of the second MOS transistor is connected to the inductance measurement terminal, and the gate of the second MOS transistor is connected to the fast charging chip.

In an implementation manner, the input switch includes a second resistor, a third MOS transistor and a fourth MOS transistor connected in series;

The drain of the third MOS transistor is connected to the AC-DC conversion circuit, the gate of the third MOS transistor is connected to the input switch control module, and the source of the third MOS transistor is connected to the fourth MOS the source of the fourth MOS transistor; the gate of the fourth MOS transistor is connected to the input switch control module, the drain of the fourth MOS transistor is connected to the input end of the output switch; the second resistor is connected in parallel with the first Between the source and the gate of the three MOS transistors;

The output switch includes a fifth MOS transistor and a third resistor;

The source of the fifth MOS transistor is connected to the drain of the fourth MOS transistor, the drain of the fifth MOS transistor is connected to the discharge output USB interface, and the gate of the fifth MOS transistor is connected to the output A switch control module; the third resistor is connected in parallel between the source and the gate of the fifth MOS transistor.

In a second aspect, an embodiment of the present application provides a fast charging chip, which is applied to the fast charging charger described in the first aspect, wherein:

The fast-charging chip is used to detect whether the AC-DC conversion circuit of the fast-charging charger has AC voltage connected; and, detecting whether the discharging output USB interface of the fast-charging charger has the electrical equipment connected or not. and, confirming whether the connected electrical equipment has a fast charging protocol enabled; and, controlling the fast charging according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy The charger enters a target state, and the target state includes one of the following: a standby state, a slow charging state, a fast charging state, a slow discharging state, a fast discharging state, a slow charging and slow discharging state, and a fast charging and discharging state.

In a third aspect, an embodiment of the present application provides a method for controlling a fast charging charger, which is applied to the fast charging chip described in the second aspect, and the method includes:

Detecting the state of the AC-DC conversion circuit of the fast charging charger, and detecting the state of the USB interface of the discharging output universal serial bus of the fast charging charger;

According to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy, the fast charging charger is controlled to enter a target state, and the target state includes one of the following: standby state, slow charging Charging status, fast charging status, slow discharging status, fast discharging status, slow charging and slow discharging status, fast charging and discharging status.

In an implementation manner, the fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage applied for by the electrical equipment, and the method further includes:

If the fast charging voltage applied for by the electrical equipment changes, the AC-DC detection control module adjusts the output voltage of the AC-DC conversion circuit to the fast charging voltage applied for by the electrical equipment, and the The DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit.

It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, and realizes the actual situation. Control the fast charging charger to improve the practicality of the charger.

Description of drawings

FIG. 1 is a structural diagram of a fast charging charger provided by an embodiment of the present application;

FIG. 2 is a structural diagram of a fast charging chip provided by an embodiment of the present application;

3 is a structural diagram of a DC-DC buck-boost circuit provided by an embodiment of the present application;

4 is a circuit diagram of an input switch and an output switch provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a control method of a fast charging charger provided by an embodiment of the present application.

Reference numerals include:

AC-DC conversion circuit 1; rechargeable battery 2; discharge output USB interface 3; control chip 4; DC-DC buck-boost circuit 5; input switch 6; output switch 7;

The first MOS transistor P1; the second MOS transistor N1;

The first resistor R1 to the third resistor R3; the first inductor L1;

The third MOS transistor P2 to the fifth MOS transistor P4.

Detailed ways

Hereinafter, the embodiments of the present application will be explained in detail with reference to the accompanying drawings. The examples are given for illustrative purposes only, and should not be construed as limitations on the present application. The accompanying drawings are only used for reference and description, and do not constitute a limitation on the scope of the patent protection of the present application. limitation, since many changes may be made to this application without departing from the spirit and scope of the application.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a fast charging charger provided by an embodiment of the present application. The fast charging charger includes an alternating current (Alternating Current, AC)-DC (Direct Current, DC) conversion circuit 1, which can A rechargeable battery 2 , a discharge output Universal Serial Bus (USB) interface 3 , and also includes a fast charging chip 4 , a DC-DC buck-boost circuit 5 , an input switch 6 and an output switch 7 ;

The AC-DC conversion circuit 1 is connected to the input end of the input switch 6 and the fast charging chip 4; the output end of the input switch 6 is connected to the input end of the output switch 7 and the DC-DC lifter voltage circuit 5; the control end of the input switch 6 and the control end of the output switch 7 are connected to the fast charging chip 4; the output end of the output switch 7 is connected to the discharge output USB interface 3; the DC- The DC buck-boost circuit 5 is also connected to the fast charging chip 4 and the rechargeable battery 2; the discharge output USB interface 3 is also connected to the fast charging chip 4;

The AC-DC conversion circuit 1 is used to convert the connected alternating current into direct current, and under the control of the fast charging chip 4, output the direct current to the DC-DC step-up and step-up circuit 5 or other circuits. The electrical equipment connected to the discharge output USB interface 3;

The DC-DC buck-boost circuit 5 is used to convert the DC voltage output by the AC-DC conversion circuit 1 into a battery voltage to charge the rechargeable battery 2 under the control of the fast charging chip 4 , Or convert the battery voltage output by the rechargeable battery 2 into a DC voltage to supply power to the electrical equipment;

The fast charging chip 4 is used to detect whether the AC-DC conversion circuit 1 has access to an AC voltage; and, to detect whether the discharge output USB interface 3 has access to the electrical equipment; and, to confirm the access Whether the fast charging protocol is enabled for the electrical equipment; and, according to the state of the AC-DC conversion circuit 1, the state of the discharge output USB interface 3, and the preset control strategy to control the fast charging charger to enter the target The target state includes one of the following: a standby state, a slow charging state, a fast charging state, a slow discharging state, a fast discharging state, a slow charging and slow discharging state, and a fast charging and discharging state.

In this embodiment, when the AC-DC conversion circuit is connected to the alternating current, and the input energy is greater than the output energy, the rechargeable battery 2 will store energy; when the AC-DC conversion circuit is not connected to the alternating current, or the input energy is less than the output demand energy At the time, the rechargeable battery 2 releases the stored energy to the electrical equipment to supply power for the electrical equipment.

It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, and realizes the actual situation. Control the fast charging charger to improve the practicality of the charger.

In an implementation manner of the present application, please refer to FIG. 2 , the fast charging chip 4 includes a control state machine 41 programmed with the preset control strategy, and a load detection module independently connected to the control state machine 41 42. The protocol identification module 43, the AC-DC detection control module 44, the DC-DC buck-boost detection control module 45, the input switch control module 46 and the output switch control module 47;

The load detection module 42 and the protocol identification module 43 are connected to the discharge output USB interface 3; the AC-DC detection control module 44 is connected to the AC-DC conversion circuit 1; the DC-DC step-up and step-down detection The control module 45 is connected to the DC-DC buck-boost circuit 5; the input switch control module 46 is connected to the input switch 6; the output switch control module 47 is connected to the output switch 7;

The load detection module 42 is used to detect whether the discharge output USB interface 3 is plugged or unplugged with an electrical device, and input the detected load detection signal to the control state machine 41;

The protocol identification module 43 is used to identify whether the electric device connected to the discharge output USB interface 3 has a fast charging protocol, and input the identified charging protocol identification signal to the control state machine 41;

The AC-DC detection control module 44 is used to detect whether the AC-DC conversion circuit 1 is connected to an AC power supply, and input the detected power supply connection signal to the control state machine 41;

The control state machine 41 is configured to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power connection signal, and the preset control strategy.

In this application, if the AC-DC detection and control module 44 detects that the AC-DC conversion circuit 1 outputs direct current, it determines that the AC-DC conversion circuit 1 has AC voltage connected to it; otherwise, it determines that the AC-DC conversion circuit 1 has no AC voltage. The AC voltage is connected, and the power connection signal is fed back to the control state machine at the same time.

Wherein, the control state machine 41 may also be implemented by the main program of a microcontroller unit (Microcontroller Unit, MCU).

It can be seen that in the embodiment of the present application, the fast charging chip includes multiple modules, and different modules are respectively connected to different components, so that the fast charging chip can be controlled more reasonably and the performance of the fast charging charger can be improved.

In an implementation manner of the present application, the preset control strategy includes:

If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, controlling the fast charging charger to enter a standby state;

If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state, and in the slow charging state, the control state machine passes the AC power - The DC detection control module controls the AC-DC conversion circuit to output a default DC voltage, and the control state machine controls the DC-DC boost and boost circuit for the rechargeable battery through the DC-DC boost and boost detection control module. Charge;

If in the slow charge state, and the discharge output USB interface is not connected to the electrical device, the fast charge charger is controlled to enter the fast charge state, and in the fast charge state, the control state machine passes the The AC-DC detection control module controls the AC-DC conversion circuit to output a fast charging voltage, and the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to be The rechargeable battery is fast-charged;

If in the standby state, and the power is turned on through a button or the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter a slow discharge state, and in the slow discharge state, the control state The machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electrical equipment;

If in the slow discharge state, the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast discharge state, and in the fast discharge state, the control state The machine controls the DC-DC buck-boost circuit to perform fast charging for the electrical equipment through the DC-DC buck-boost detection control module;

If in the slow charge state, and the discharge output USB interface is connected to the electrical equipment, the fast charge charger is controlled to enter the slow charge and slow discharge state, and in the slow charge and slow discharge state, the control The state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to supply the electricity for the power consumption. The device is normally charged;

If in the fast charging state, and the discharge output USB interface is connected to an electrical device, controlling the fast charging charger to enter the slow charging and slow discharging state;

If in the slow charge and slow discharge state, and if the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast charge and discharge state, and in the fast charge In the charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch control module through the input switch control module. an input switch to fast charge the electrical equipment;

If in the fast-discharging state, the AC-DC conversion circuit is connected to an AC power supply, the fast-charging charger is controlled to enter the fast-charging-while-charging-while-discharging state.

Optionally, the fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage applied by the electrical equipment; or, the fast charging voltage output by the AC-DC conversion circuit is preset by the fast charging charger. of.

Optionally, the fast charging chip is further configured to adjust the output voltage of the AC-DC conversion circuit to the required value through the AC-DC detection control module if the fast charging voltage applied by the electrical equipment changes. The fast charging voltage currently applied for by the electrical equipment, and the output voltage of the DC-DC buck-boost circuit is controlled within a preset range by the DC-DC buck-boost detection control module, and the preset range is is determined based on the output voltage of the AC-DC conversion circuit.

Among them, the preset range is:

The V ₁ is the output voltage of the AC-DC conversion circuit, V _2i is the fast charging voltage applied by the electrical equipment for the i-th time, and n is the number of times that the user equipment applies for the fast charging voltage.

Optionally, the preset control strategy further includes:

If in the slow charging state, it is detected that the AC power supply is pulled out, controlling the fast charging charger to enter a standby state;

If it is detected that the rechargeable battery is fully charged in the fast charging state, controlling the fast charging charger to enter the slow charging state;

If it is detected that the AC power source is pulled out in the slow charging and slow discharging state, the fast charging charger is controlled to enter the slow discharging state;

If in the fast discharge state, it is detected that the electrical device applies for exiting the fast charge, controlling the fast charge charger to enter the slow discharge state;

If in the slow discharge state, it is detected that the electrical device is fully charged or unplugged, or it is detected that the fast charging charger is forcibly turned off by pressing a button, controlling the fast charging charger to enter a standby state;

If it is detected that the AC power supply is pulled out in the fast charging and discharging state, the fast charging charger is controlled to enter the fast discharging state;

In the fast-discharging state, if it is detected that the electrical device is fully charged or unplugged, or it is detected that the fast-charging charger is forcibly turned off by pressing a button, the fast-charging charger is controlled to enter a standby state;

In the fast charging and discharging state, it is detected that the electrical device applies for exiting the fast charging, and the fast charging charger is controlled to enter the slow charging and slow discharging state;

In the slow charging and slow discharging state, it is detected that the electrical device is fully charged or unplugged, and the fast charging charger is controlled to enter the slow charging state.

It can be seen that, in the embodiment of the present application, when the AC power supply is not connected and the electrical equipment is not connected, the fast charging charger enters a standby state to reduce power consumption. In the standby state, if the AC power supply is connected, the fast-charging charger enters a slow-charging state and performs normal charging for the rechargeable battery, so that the fast-charging charger can slowly store energy. In the slow charging state, if there is no powered device connected, the fast charging charger enters the fast charging state to quickly charge the rechargeable battery, so that the fast charging charger can quickly store energy. In the standby state, if the power is turned on by pressing the button or a useful electrical device is connected, the fast charging charger enters the slow discharge state, and performs normal charging for the electrical device to prevent the high-voltage output from damaging the electrical device that does not support high-voltage fast charging. In the slow-discharge state, if the electrical device has a fast-charging protocol and the fast-charging protocol handshake is successful, the fast-charging charger enters the fast-discharging state to fast-charge the electrical device, so as to quickly charge the electrical device. the goal of. In the slow charging state, if a useful electrical device is connected, the fast charging charger enters the slow charging and slow discharging state, so as to realize the effect of charging and discharging at the same time. In the fast charging state, if a useful electrical device is connected, the fast charging charger enters a slow charging and slow discharging state to prevent the output high voltage from damaging electrical devices that do not support high-voltage fast charging. In the slow charging and slow discharging state, if the powered device has a fast charging protocol and the handshake is successful, the fast charging charger enters the fast charging and discharging state, so as to realize the effect of fast charging and discharging. In the fast-discharging state, if the AC power is connected, the fast-charging charger enters the fast-charging and discharging state, so as to realize the effect of fast-charging and discharging.

In an implementation manner of the present application, please refer to FIG. 3 , the DC-DC buck-boost circuit 5 includes a first metal oxide semiconductor (Metal Oxide Semiconductor, MOS) transistor P1, a second MOS transistor N1, and a first resistor R1 and the first inductor L1;

The source S of the first MOS transistor P1 is connected to the output end of the input switch 6 , the gate G of the first MOS transistor P1 is connected to the DC-DC buck-boost detection control module 45 , the first The drain D of the MOS transistor P1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the rechargeable battery 2; both ends of the first resistor R1 are connected in parallel with the first MOS Between the source S and the gate G of the tube P1;

The source S of the second MOS transistor N1 is grounded, the drain D of the second MOS transistor N1 is connected to the inductance measuring terminal LX, and the gate G of the second MOS transistor N1 is connected to the fast charging chip 4 .

The first MOS transistor P1 is a P-channel enhancement type MOS transistor; the second MOS transistor N1 is an N-channel enhancement type MOS transistor.

In an implementation manner of the present application, please refer to FIG. 4 , the input switch 6 includes a second resistor R2 and a third MOS transistor P2 and a fourth MOS transistor P3 connected in series;

The drain D of the third MOS transistor P2 is connected to the AC-DC conversion circuit 1, the gate G of the third MOS transistor P2 is connected to the input switch control module, and the source of the third MOS transistor P2 S is connected to the source S of the fourth MOS transistor P3; the gate G of the fourth MOS transistor P3 is connected to the input switch control module, and the drain D of the fourth MOS transistor P3 is connected to the output switch 7 The input end of ; the second resistor R2 is connected in parallel between the source S and the gate G of the third MOS transistor P2;

The output switch 7 includes a fifth MOS transistor P4 and a third resistor R3;

The source S of the fifth MOS transistor P4 is connected to the drain D of the fourth MOS transistor P3, the drain D of the fifth MOS transistor P4 is connected to the discharge output USB interface 3, and the fifth MOS transistor The gate G of P4 is connected to the output switch control module; the third resistor R3 is connected in parallel between the source S and the gate G of the fifth MOS transistor P4.

The third MOS transistor P2, the fourth MOS transistor P3, and the fifth MOS transistor P4 are all P-channel enhancement type MOS transistors.

In an implementation manner of the present application, the AC-DC conversion circuit 1 includes an AC-DC controller;

The AC-DC controller is connected to the AC-DC detection control module 44 .

Wherein, the default DC voltage is 5V, and the fast charging voltage range is 5-20V.

In the embodiment of the present application, when an AC voltage is connected, the AC-DC detection and control module adjusts the output voltage of the AC-DC conversion circuit 1 according to the preset control strategy, so that it can meet the requirements of the actual connected electrical equipment. The fast charging voltage is output, so that there is also a fast charging output when charging and discharging, while increasing the charging power, shortening the charging time, and improving the charging efficiency.

Please refer to FIG. 5. FIG. 5 is a schematic flowchart of a control method of a fast charging charger provided by an embodiment of the present application. The method is applied to the above fast charging chip and includes the following steps:

Step 501: Detecting the state of the AC-DC conversion circuit of the fast-charging charger, and detecting the state of the USB interface of the discharging output of the fast-charging charger;

Step 502: Control the fast charging charger to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy, and the target state includes one of the following: standby Status, slow charging status, fast charging status, slow discharging status, fast discharging status, slow charging and slow discharging status, fast charging while charging and discharging status.

Optionally, for the rechargeable battery to boost the voltage to charge the electrical device, two conditions need to be met:

1) Connect to the AC power supply; 2) The output voltage of the AC-DC conversion circuit is greater than or equal to the voltage of the discharge output USB interface.

Optionally, the fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage applied for by the electrical equipment, and the method further includes:

If the fast charging voltage applied for by the electrical equipment changes, the AC-DC detection control module adjusts the output voltage of the AC-DC conversion circuit to the fast charging voltage applied for by the electrical equipment, and the The DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit.

It can be seen that in the embodiment of the present application, when the fast charging voltage applied by the electrical equipment changes, the fast charging chip adjusts the output voltage in time to quickly meet the needs of the electrical equipment and further improve the performance of the fast charging charger.

It should be noted that, the preset control strategy is as described above, and is not described here again.

It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, and realizes the actual situation. Control the fast charging charger to improve the practicality of the charger.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (12)

1. A fast-charging charger, characterized in that it comprises an AC-DC-DC conversion circuit, a rechargeable battery, a discharge output universal serial bus USB interface, a fast-charging chip, a DC-DC boost and boost circuit, an input switch and output switch; The AC-DC conversion circuit is connected to the input end of the input switch and the fast charging chip; the output end of the input switch is connected to the input end of the output switch and the DC-DC boost and boost circuit; the The control end of the input switch and the control end of the output switch are connected to the fast charge chip; the output end of the output switch is connected to the discharge output USB interface; the DC-DC boost and voltage circuit is also connected to the fast charge a chip and the rechargeable battery; the discharge output USB interface is also connected to the fast charging chip; The AC-DC conversion circuit is used to convert the connected alternating current into direct current, and under the control of the fast charging chip, output the direct current to the DC-DC buck-boost circuit or the discharge output Electrical equipment connected to the USB interface; The DC-DC buck-boost circuit is used to convert the DC voltage output by the AC-DC conversion circuit into a battery voltage to charge the rechargeable battery under the control of the fast charging chip, or to charge the rechargeable battery. The battery voltage output by the rechargeable battery is converted into a DC voltage to supply power to the electrical equipment; The fast charging chip is used to detect whether the AC-DC conversion circuit is connected to an AC voltage; and, to detect whether the discharge output USB interface is connected to the electrical device; and, to confirm the connected Whether the electrical device has enabled the fast charging protocol; and, according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, the fast charging charger is controlled to enter the target state, the target The status includes one of the following: standby status, slow charging status, fast charging status, slow discharging status, fast discharging status, slow charging and slow discharging status, and fast charging and discharging status. 2 . The fast charging charger according to claim 1 , wherein the fast charging chip comprises a control state machine programmed with the preset control strategy, and a load detection device independently connected to the control state machine. 3 . module, protocol identification module, AC-DC detection control module, DC-DC buck-boost detection control module, input switch control module and output switch control module; The load detection module and the protocol identification module are connected to the discharge output USB interface; the AC-DC detection control module is connected to the AC-DC conversion circuit; the DC-DC buck-boost detection control module is connected to the DC-DC buck-boost circuit; the input switch control module is connected to the input switch; the output switch control module is connected to the output switch; The load detection module is used to detect whether the discharge output USB interface is plugged or unplugged with an electrical device, and input the detected load detection signal to the control state machine; The protocol identification module is used to identify whether the electrical device connected to the discharge output USB interface has a fast charging protocol, and input the identified charging protocol identification signal to the control state machine; The AC-DC detection control module is used to detect whether the AC-DC conversion circuit has access to an AC power supply, and input the detected power supply connection signal to the control state machine; The control state machine is configured to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power supply connection signal, and the preset control strategy. 3. The fast charging charger of claim 2, wherein the preset control strategy comprises: If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, controlling the fast charging charger to enter a standby state; If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state, and in the slow charging state, the control state machine passes the AC power - The DC detection control module controls the AC-DC conversion circuit to output a default DC voltage, and the control state machine controls the DC-DC boost and boost circuit for the rechargeable battery through the DC-DC boost and boost detection control module. Charge; If in the slow charge state, and the discharge output USB interface is not connected to the electrical device, the fast charge charger is controlled to enter the fast charge state, and in the fast charge state, the control state machine passes the The AC-DC detection control module controls the AC-DC conversion circuit to output a fast charging voltage, and the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to be The rechargeable battery is fast-charged; If in the standby state, and the power is turned on through a button or the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter a slow discharge state, and in the slow discharge state, the control state The machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electrical equipment; If in the slow discharge state, the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast discharge state, and in the fast discharge state, the control state The machine controls the DC-DC buck-boost circuit to perform fast charging for the electrical equipment through the DC-DC buck-boost detection control module; If in the slow charge state, and the discharge output USB interface is connected to the electrical equipment, the fast charge charger is controlled to enter the slow charge and slow discharge state, and in the slow charge and slow discharge state, the control The state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to supply the electricity for the power consumption. The device is normally charged; If in the fast charging state, and the discharge output USB interface is connected to an electrical device, controlling the fast charging charger to enter the slow charging and slow discharging state; If in the slow charge and slow discharge state, and if the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast charge and discharge state, and in the fast charge In the charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch control module through the input switch control module. an input switch to fast charge the electrical equipment; If in the fast-discharging state, the AC-DC conversion circuit is connected to an AC power supply, the fast-charging charger is controlled to enter the fast-charging-while-charging-while-discharging state. 4. The fast charging charger according to claim 2 or 3, wherein the DC-DC step-up and step-down circuit comprises a first MOS transistor, a second MOS transistor, a first resistor and a first inductor; The source of the first MOS transistor is connected to the output end of the input switch, the gate of the first MOS transistor is connected to the DC-DC boost voltage detection control module, and the drain of the first MOS transistor is connected to One end of the first inductor, and the other end of the first inductor is connected to the rechargeable battery; Both ends of the first resistor are connected in parallel between the source and the gate of the first MOS transistor; The source of the second MOS transistor is grounded, the drain of the second MOS transistor is connected to the inductance measurement terminal, and the gate of the second MOS transistor is connected to the fast charging chip. 5. The fast charging charger according to claim 2 or 3, wherein the input switch comprises a second resistor, a third MOS transistor and a fourth MOS transistor connected in series; The drain of the third MOS transistor is connected to the AC-DC conversion circuit, the gate of the third MOS transistor is connected to the input switch control module, and the source of the third MOS transistor is connected to the fourth MOS the source of the fourth MOS transistor; the gate of the fourth MOS transistor is connected to the input switch control module, the drain of the fourth MOS transistor is connected to the input end of the output switch; the second resistor is connected in parallel with the first Between the source and the gate of the three MOS transistors; The output switch includes a fifth MOS transistor and a third resistor; The source of the fifth MOS transistor is connected to the drain of the fourth MOS transistor, the drain of the fifth MOS transistor is connected to the discharge output USB interface, and the gate of the fifth MOS transistor is connected to the output A switch control module; the third resistor is connected in parallel between the source and the gate of the fifth MOS transistor. 6. The fast charging charger according to claim 2 or 3, wherein the AC-DC conversion circuit comprises an AC-DC controller; The AC-DC controller is connected to the AC-DC detection control module. 7. A fast-charging chip, characterized in that it is applied to the fast-charging charger according to any one of claims 1-6, wherein: The fast-charging chip is used to detect whether the AC-DC-DC conversion circuit of the fast-charging charger has an AC voltage connected; and, detecting whether the discharging output of the fast-charging charger has a USB interface The electrical device is connected; and, confirming whether the connected electrical device has a fast charging protocol enabled; and, according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset The control strategy controls the fast charge charger to enter a target state, and the target state includes one of the following: standby state, slow charge state, fast charge state, slow discharge state, fast discharge state, slow charge and slow discharge state, fast charge The state of charging and discharging. 8 . The fast charging chip of claim 7 , wherein the fast charging chip comprises a control state machine programmed with the preset control strategy, and a load detection module independently connected to the control state machine. 9 . , Protocol identification module, AC-DC detection control module, DC-DC buck-boost detection control module, input switch control module and output switch control module; The load detection module and the protocol identification module are connected to the discharge output USB interface; the AC-DC detection control module is connected to the AC-DC conversion circuit; the DC-DC buck-boost detection control module is connected to the DC-DC buck-boost circuit; the input switch control module is connected to the input switch; the output switch control module is connected to the output switch; The load detection module is used to detect whether the discharge output USB interface is plugged or unplugged with an electrical device, and input the detected load detection signal to the control state machine; The protocol identification module is used to identify whether the electrical device connected to the discharge output USB interface has a fast charging protocol, and input the identified charging protocol identification signal to the control state machine; The AC-DC detection control module is used to detect whether the AC-DC conversion circuit has access to an AC power supply, and input the detected power supply connection signal to the control state machine; The control state machine is configured to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power supply connection signal, and the preset control strategy. 9. The fast charging chip of claim 8, wherein the preset control strategy comprises: If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, controlling the fast charging charger to enter a standby state; If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state, and in the slow charging state, the control state machine passes the AC power - The DC detection control module controls the AC-DC conversion circuit to output a default DC voltage, and the control state machine controls the DC-DC boost and boost circuit for the rechargeable battery through the DC-DC boost and boost detection control module. Charge; If in the slow charge state, and the discharge output USB interface is not connected to the electrical device, the fast charge charger is controlled to enter the fast charge state, and in the fast charge state, the control state machine passes the The AC-DC detection control module controls the AC-DC conversion circuit to output a fast charging voltage, and the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to be The rechargeable battery is fast-charged; If in the standby state, and the power is turned on through a button or the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter a slow discharge state, and in the slow discharge state, the control state The machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electrical equipment; If in the slow discharge state, the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast discharge state, and in the fast discharge state, the control state The machine controls the DC-DC buck-boost circuit to perform fast charging for the electrical equipment through the DC-DC buck-boost detection control module; If in the slow charge state, and the discharge output USB interface is connected to the electrical equipment, the fast charge charger is controlled to enter the slow charge and slow discharge state, and in the slow charge and slow discharge state, the control The state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to supply the electricity for the power consumption. The device is normally charged; If in the fast charging state, and the discharge output USB interface is connected to an electrical device, controlling the fast charging charger to enter the slow charging and slow discharging state; If in the slow charge and slow discharge state, and if the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast charge and discharge state, and in the fast charge In the charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch control module through the input switch control module. an input switch to fast charge the electrical equipment; If in the fast-discharging state, the AC-DC conversion circuit is connected to an AC power supply, the fast-charging charger is controlled to enter the fast-charging-while-charging-while-discharging state. 10. A control method for a fast charging charger, characterized in that, applied to the fast charging chip according to any one of claims 7-9, the method comprising: Detecting the state of the AC-DC conversion circuit of the fast charging charger, and detecting the state of the USB interface of the discharging output universal serial bus of the fast charging charger; According to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy, the fast charging charger is controlled to enter a target state, and the target state includes one of the following: standby state, slow charging Charging status, fast charging status, slow discharging status, fast discharging status, slow charging and slow discharging status, fast charging and discharging status. 11. The method of claim 10, wherein the fast charging chip comprises a control state machine programmed with the preset control strategy, and an AC-DC detection control independently connected to the control state machine module, DC-DC buck-boost detection control module, input switch control module and output switch control module; The preset control strategy includes: If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, controlling the fast charging charger to enter a standby state; If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state, and in the slow charging state, the control state machine passes the AC power - The DC detection control module controls the AC-DC conversion circuit to output a default DC voltage, and the control state machine controls the DC-DC boost and boost circuit for the rechargeable battery through the DC-DC boost and boost detection control module. Charge; If in the slow charge state, and the discharge output USB interface is not connected to the electrical device, the fast charge charger is controlled to enter the fast charge state, and in the fast charge state, the control state machine passes the The AC-DC detection control module controls the AC-DC conversion circuit to output a fast charging voltage, and the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to be The rechargeable battery is fast-charged; If in the standby state, and the power is turned on through a button or the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter a slow discharge state, and in the slow discharge state, the control state The machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electrical equipment; If in the slow discharge state, the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast discharge state, and in the fast discharge state, the control state The machine controls the DC-DC buck-boost circuit to perform fast charging for the electrical equipment through the DC-DC buck-boost detection control module; If in the slow charge state, and the discharge output USB interface is connected to the electrical equipment, the fast charge charger is controlled to enter the slow charge and slow discharge state, and in the slow charge and slow discharge state, the control The state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to supply the electricity for the power consumption. The device is normally charged; If in the fast charging state, and the discharge output USB interface is connected to an electrical device, controlling the fast charging charger to enter the slow charging and slow discharging state; If in the slow charge and slow discharge state, and if the electrical device has a fast charge protocol and the fast charge protocol handshake is successful, the fast charge charger is controlled to enter the fast charge and discharge state, and in the fast charge In the charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch control module through the input switch control module. an input switch to fast charge the electrical equipment; If in the fast-discharging state, the AC-DC conversion circuit is connected to an AC power supply, the fast-charging charger is controlled to enter the fast-charging-while-charging-while-discharging state. 12 . The method of claim 11 , wherein the fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage applied by the electrical equipment, and the method further comprises: 12 . If the fast charging voltage applied for by the electrical equipment changes, the AC-DC detection control module adjusts the output voltage of the AC-DC conversion circuit to the fast charging voltage applied for by the electrical equipment, and the The DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit.

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