WO2019062865A1 - Isolated switch power supply and electronic device thereof - Google Patents

Abstract

The invention relates to an isolated switching power supply and an electronic device thereof. The utility model comprises: an input rectification circuit, a resonance network controller and a transformer circuit; the transformer circuit comprises: a resonance network circuit and a transformer; the input rectification circuit is configured to rectify the input alternating current into a direct current output; the resonant network controller, ??? controlling, according to the voltage of the direct current outputted by the input rectifying circuit, the resonant network circuit to form a different resonant circuit; the resonant net circuit is electrically connected between the input rectifying circuit and the primary side of the transformer; the resonant net circuit is The resonant circuit composed of the control of the resonant network controller is combined with the transformer, and after the DC power supply outputted from the input rectifier circuit is subjected to voltage transformation processing, the power supply is outputted from the secondary side of the transformer. The solution is composed of different resonant circuits for voltage input in different sections, and the input voltage is subjected to voltage transformation processing to output a power supply, thereby adapting to a wider range of voltage inputs.

Description

Isolated switching power supply and electronic device thereof Technical field

The present invention relates to the field of power electronics, and in particular to an isolated switching power supply and an electronic device thereof.

Background technique

With the popularity of portable electronic products, the size of power adapters and chargers has become smaller and smaller. For low-power AC/DC (AC-DC converter) devices, resonant switching power supplies are currently basically used. However, due to the low utilization of the transformer core of the resonant switching power supply, it has become an obstacle to further reducing the size of the adapter or charger using such a power supply circuit.

In order to reduce the volume, only the core utilization and operating frequency are increased. Therefore, soft switching technology has emerged. The soft switching technology can control the inductor-capacitor resonance network and improve the utilization of the transformer core.

However, the resonant switching power supply controlled by the soft switch has the highest efficiency near the resonance point, and the farther away from the resonance point, the lower the working efficiency, and the soft switching technique will fail when it exceeds a certain range. Therefore, the current soft-switching resonant switching power supply can only adapt to the voltage input in a certain interval. At present, the voltages of the mains in the world are not the same, and the difference is large. The span between the highest mains voltage and the lowest mains voltage is large. Therefore, electronic devices (such as adapters, chargers, and the like) using the switching power supply cannot be used universally in the world, thereby causing inconvenience to the user.

Summary of the invention

The technical problem to be solved by the present invention is to provide an isolated switching power supply and an electronic device thereof that are applicable to a wide range of voltage inputs.

In order to solve the above technical problems, the present invention provides the following technical solutions:

In one aspect, the present invention provides an isolated switching power supply including an input rectification circuit, a resonant network controller, and a transformer circuit; the transformer circuit includes: a resonant network circuit and a transformer; the input rectification circuit is configured to input The alternating current rectification is a direct current output; the resonant network controller is configured to control the resonant network circuit to form a different resonant circuit according to the voltage of the direct current outputted by the input rectifying circuit; the resonant net circuit is electrically connected to the input rectifying circuit and connected to the The resonant circuit of the resonant network circuit under the control of the resonant network controller is combined with the transformer, and the DC power supply outputted by the input rectifier circuit is subjected to voltage transformation processing, and then the secondary side output power of the transformer is output. power supply.

Optionally, when the voltage of the DC power output by the input rectifier circuit is within the first voltage segment, the resonant network controller controls the resonant network circuit to form a first resonant circuit; when the voltage of the direct current output by the input rectifier circuit is In the second voltage segment, the resonant network controller controls the resonant network circuit to form a second resonant circuit; the first voltage segment and the second voltage segment are preset voltage ranges.

Optionally, the isolated switching power supply further includes: an output rectifying and stabilizing circuit; the output rectifying and stabilizing circuit is electrically connected to the secondary side of the transformer, and is used for rectifying and stabilizing the power supply of the secondary side of the transformer. .

Optionally, the isolated switching power supply further includes: an input voltage detecting circuit electrically connected between an output end of the input rectifying circuit and an input end of the resonant network controller; the input voltage detecting circuit outputs the input rectifying circuit After detecting the voltage of the direct current, the detection signal is output to the resonant network controller, and the detection signal is used to identify the voltage section of the direct current power supply; the resonant network controller controls the resonant circuit corresponding to the resonant network circuit according to the detection signal. .

Optionally, the isolated switching power supply further includes: a storage circuit electrically connected between the output end of the input rectifying circuit and the input end of the transforming circuit.

Optionally, the resonant network controller includes: a first output end and a second output end; the transformer circuit includes: a resonant network circuit and a transformer; the resonant network circuit includes: a first switch, a first switch, and a a resonant capacitor, a second switching switch, a second switching transistor, a second resonant capacitor, and an inductor; wherein the first switching transistor and the second switching transistor are connected in series between the power input end and the ground; the first switching transistor The gate of the second switch tube respectively receives the pulse signal outputted by the resonant network controller; the inductor, the primary side of the transformer, and the first capacitor are connected in series between the first switch tube and the second switch tube Between the connection node and the ground; the first switch is connected in parallel with the inductor, and the control end of the first switch is connected to the first output of the resonant network controller; both ends of the second switch The first capacitors are connected in parallel, and the control end of the second switch is connected to the second output of the resonant network controller.

Optionally, when the resonant network controller controls the first switch to be turned on and the second switch to be turned off, the primary leakage inductance of the transformer and the first capacitor are connected in series to form a resonant circuit.

Optionally, when the resonant network controller controls the first switch and the second switch to be turned on, the primary leakage inductance, the first capacitance, and the second capacitance of the transformer form a resonant circuit, wherein the primary side of the transformer The leakage inductance and the first capacitor are connected in series, and the second capacitor and the first capacitor are connected in parallel.

Optionally, when the resonant network controller controls the first switch to be turned off and the second switch to be turned on, the inductor, the primary leakage inductance of the transformer, the first capacitor, and the second capacitor constitute a resonant circuit, The first capacitor is connected in series, and the second capacitor is connected in parallel with the first capacitor.

Optionally, when the resonant network controller controls the first switch and the second switch are both turned off, the inductor, the primary leakage inductance of the transformer, and the first capacitor constitute a resonant circuit, wherein the inductor, the The primary side leakage inductance of the transformer is connected in series with the first capacitor.

In another aspect, the present invention provides an electronic device comprising the isolated switching power supply of any of the above.

The invention has the beneficial effects of segmenting the full voltage, controlling the resonant network circuit to form different resonant circuits for voltage input in different sections, and transforming the input voltage to output the power supply. Thereby, the isolated switching power supply and the electronic device using the isolated switching power supply can be matched to different input voltages to adapt to a wider range of voltage inputs.

DRAWINGS

1 is a schematic diagram of a circuit module provided in Embodiment 1 of the isolated switching power supply of the present invention;

2 is a schematic diagram of a circuit module provided in Embodiment 2 of the isolated switching power supply of the present invention;

3 is a schematic diagram of a circuit module provided in Embodiment 3 of the isolated switching power supply of the present invention;

4 is a circuit diagram of a resonant network controller 20 and a transformer circuit 30 provided in Embodiment 4 of the isolated switching power supply of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the understanding of the disclosure of the invention may be more thorough.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

1 is a schematic diagram of a circuit module provided in Embodiment 1 of the isolated switching power supply of the present invention. The isolated switching power supply includes an input rectifier circuit 10, a resonant network controller 20, and a transformer circuit 30. The transformer circuit 30 includes a resonant network circuit 31 and a transformer 33.

The input rectifying circuit 10 is configured to rectify the input alternating current into a direct current output. Specifically, the input rectifying circuit 10 can use a bridge rectifying circuit to rectify the input alternating current into a unidirectional pulsating direct current.

The resonant network controller 20 is configured to control the resonant network circuit 31 to form different resonant circuits according to the voltage of the direct current output from the input rectifying circuit 10. Specifically, when the voltage of the direct current outputted by the input rectifying circuit 10 is within the first voltage segment, the resonant net circuit 31 is controlled to constitute a first resonant circuit; when the voltage of the direct current outputted by the input rectifying circuit 10 is in the second voltage segment Then, the resonant network circuit 31 is controlled to constitute a second resonant circuit. The first voltage segment and the second voltage segment are preset value ranges. Therefore, the isolated switching power supply can perform voltage transformation processing on a voltage within a preset range to satisfy a wide range of voltage input.

More specifically, the collection of the numerical ranges of the first voltage segment and the second voltage segment may be a range of values of the full voltage. The so-called full voltage means that the input voltage (and frequency) of the electrical equipment is suitable for the voltage range used by various commercial power sources around the world. For example, the AC voltage range is between 85 and 264V, the frequency is 50Hz or 60Hz, and the DC voltage is between 120 and 370V. The resonant network circuit 31 can form at least two different resonant circuits. In the first embodiment, the idea of the present invention is illustrated by two examples, but is not limited to two. Thus, the isolated switching power supply can transform the voltage in the full voltage range to meet all voltage inputs.

The input end of the resonant network circuit 31 is electrically connected to the input rectifying circuit 10, and the output end is electrically connected to the primary side of the transformer 33; the resonant circuit formed by the resonant net circuit 31 under the control of the resonant net controller 20 is combined with the The transformer 33 performs a transformer processing on the DC power output from the input rectifier circuit 10, and then outputs a power supply source from the secondary side of the transformer 33.

Preferably, the isolated switching power supply further includes: an output rectifying and regulating circuit 40; the output rectifying and regulating circuit 40 is electrically connected to the secondary side of the transformer 33 for rectifying the power supply output of the secondary side of the transformer 33 And voltage regulation, providing a stable DC power supply for power-receiving originals or electronic devices. For the person skilled in the art, the output rectification voltage regulator circuit 40 can have various existing implementation manners, which will not be described in detail herein.

The isolated switching power supply provided by the first embodiment of the present invention divides the full voltage into different sections, such as two voltage sections, and forms different resonant circuits according to the sections of the input voltage, and transforms the input voltage to output power. Voltage. For example, when the input alternating current is rectified in the first voltage segment, the resonant network circuit 31 is controlled by the resonant network controller 20 to form the first resonant circuit, and combined with the transformer 33 for voltage transformation processing, and outputting the power supply. When the input alternating current is rectified in the first voltage segment, the resonant network circuit 31 is controlled by the resonant network controller 20 to form a second resonant circuit, and the transformer 33 is used for voltage transformation processing, and then the power supply is output. Thereby, the switching power supply and the electronic device using the power source such as an adapter, a charger, etc. can be matched to different input voltages to adapt to the full voltage input.

2 is a schematic diagram of a circuit module provided in Embodiment 2 of the isolated switching power supply of the present invention. With respect to the first embodiment, the isolated switching power supply of the second embodiment further includes: an input voltage detecting circuit 50 electrically connected between the output end of the input rectifying circuit 10 and the input end of the resonant network controller 20;

The input voltage detecting circuit 50 detects the voltage of the direct current output from the input rectifying circuit 10, and outputs a detection signal to the resonant network controller 20, where the detecting signal is used to identify the voltage section of the direct current power source, such as at the first voltage. The segment is still in the second voltage segment; for example, when the voltage of the direct current is in the first voltage segment, the detection signal outputs a high level, and when the voltage of the direct current is in the second voltage segment, the detection signal outputs a low voltage. level.

The resonant network controller 20 controls the resonant network circuit 31 to constitute a corresponding resonant circuit based on the detection signal. For example, when the detection signal is high level, it constitutes a first resonance circuit; when the detection signal is low level, it constitutes a second resonance circuit.

Specifically, the input voltage detecting circuit 50 may be a voltage detecting chip or a conventional voltage detecting circuit. I will not go into details here.

In this embodiment, the resonant network controller 20 may not have a voltage identification function. After the voltage detecting circuit 50 recognizes the voltage value or range of the voltage, the resonant network controller 20 can be controlled by the control signal. .

Referring to FIG. 3, a schematic diagram of a circuit module provided in Embodiment 3 of the isolated switching power supply of the present invention. The isolated switching power supply of the third embodiment further includes a storage circuit 60 electrically connected between the output end of the input rectifying circuit 10 and the input end of the transforming circuit 30. The DC power outputted from the input rectification circuit 10 is supplied to the transformer circuit 30 through the tank circuit 60 for voltage transformation processing.

Referring to FIG. 4, a circuit diagram of the resonant network controller 20 and the transformer circuit 30 provided in Embodiment 4 of the isolated switching power supply of the present invention.

The resonant network controller 20 includes an input terminal A, a first output terminal B, and a second output terminal C. The input terminal A receives the DC power output from the input rectifier circuit 10, or receives the detection of the output of the input voltage detection circuit 50. signal.

The transformer circuit 30 includes a resonant network circuit 31 and a transformer 33.

The resonant network circuit 31 includes a first switching switch SW1, a first switching transistor Q1, a first resonant capacitor C1, a second switching switch SW2, a second switching transistor Q2, a second resonant capacitor C2, and an inductor L13.

The first switch tube Q1 and the second switch tube Q2 are connected in series between the power input end and the ground, and the power input end is connected to the output end of the energy storage circuit 20 or the input end of the input rectifier circuit; The gates of the first switching transistor Q1 and the second switching transistor Q2 respectively receive the pulse signals output by the resonant network controller 20.

The inductor L1, the primary side of the transformer 33, and the first capacitor C1 are connected in series between the connection node E between the first switch transistor Q1 and the second switch transistor Q2 and the ground.

Both ends of the first switch SW1 are connected in parallel with the inductor L1, and the control end of the first switch SW1 is connected to the output A of the resonant network controller 20.

Both ends of the second switch SW2 are connected in parallel with the first capacitor C1, and the control end of the second switch SW2 is connected to the output B of the resonant network controller 20.

During operation, when the resonant network controller 20 controls the first switch SW1 to be turned on and the second switch SW2 to be turned off, the inductor L1 is in a short-circuited state. At this time, the resonant network circuit 31 is connected in series by the primary side leakage inductance L2 of the transformer 33 and the first capacitor C1 to form a resonant circuit.

When the resonant network controller 20 controls the first switch SW1 and the second switch SW2 to be turned on, the inductor L1 is short-circuited, but the second capacitor C2 is connected in parallel with the first capacitor by the access circuit. At this time, the resonant network circuit 31 is composed of the primary leakage inductance L2 of the transformer 33, the first capacitor C1, and the second capacitor C2. The primary leakage inductance L2 of the transformer 33 and the first capacitor C1 are connected in series, and the second capacitor C2 is connected. The first capacitor C1 is connected in parallel.

When the resonant network controller 20 controls the first switch SW1 to be turned off and the second switch SW2 to be turned on, both the inductor L1 and the second capacitor C2 are connected to the circuit. At this time, the resonant network circuit 31 is composed of the inductor L1, the primary leakage inductance L2 of the transformer 33, the first capacitor C1, and the second capacitor C2, wherein the inductor L1, the primary side leakage inductance L2 of the transformer 33, and the first capacitor C1 are connected in series. Connected, the second capacitor C2 and the first capacitor C1 are connected in parallel.

When the resonant network controller 20 controls the first switch SW1 and the second switch SW2 to be turned off, the inductor L1 is connected to the circuit. At this time, the resonant network circuit 31 is composed of the inductor L1, the primary leakage inductance L2 of the transformer 33, and the first capacitor C1. The inductance L1, the primary leakage inductance L2 of the transformer 33, and the first capacitor C1 are connected in series.

It can be seen that the resonant network circuit 31 can form four kinds of resonant circuits under the control of the resonant network controller 20, and the frequency points of each of the resonant circuits can be different, and any two of the combinations can realize full voltage coverage. effect. For example, in the first embodiment to the third embodiment, when the input voltage is in the first voltage segment, the resonant network controller 20 controls the first switch SW1 of the resonant network circuit 31 to be turned on, the second switch SW2 to be turned off, and then input to After the DC voltage is subjected to the voltage transformation process, the power supply is output from the secondary side of the transformer 33; when the input voltage is in the second voltage segment, the resonant network controller 20 controls the first switch SW1 of the resonant network circuit 31 to be turned off, and the second switch SW2 is turned on, and then the input DC voltage is subjected to voltage transformation processing, and then the power supply is output from the secondary side of the transformer 33.

Of course, in practical applications, three or four combinations may be selected, and the input voltage is divided into corresponding three or four segments, and different resonant circuits process the input voltages in the respective corresponding voltage segments.

When designing, the operating frequency of the resonant circuit composed of the resonant net circuit 31 can be set near the resonance point according to the voltage segment that needs to be processed, so as to achieve high efficiency and stable output power, thereby achieving the design requirement of minimizing the volume.

The current soft switching technology realizes zero voltage switch ZVS (Zero Voltage Switch) on the primary side of the transformer and zero current switch ZCS (Zero Current Switch) on the secondary side, which solves the problem that the silicon MOS tube is switched, due to the source S and the drain. The overlap of voltage and current between poles D creates switching losses. However, capacitive inductive resonant circuits are only more efficient near the resonance point and, therefore, are not suitable for use in a wide range or even a full range of voltage inputs, thus having no volume and cost advantages in low power applications.

However, in a specific embodiment of the present invention, the resonant network controller 20 is used to control the resonant network circuit 31 to form different resonant circuits according to different voltage inputs, thereby meeting the requirements of a wide range or even a full range of input voltages. Not only can improve the working efficiency of the circuit, reduce the circuit loss, use a smaller core to reduce the volume of the product; also, in the absence of PFC (Power Factor Correction), the product can meet the full voltage Within the range of voltage inputs, users no longer need to have different chargers or transformers for the mains voltages of different countries. It is more convenient to use.

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application. The computer program instructions can be stored in a non-transitory computer readable storage medium, which, when executed, can include the flow of an embodiment of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only storage memory, or a random storage memory.

The above description is only the embodiment of the present application, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present application, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of this application.

Claims (11)

An isolated switching power supply, comprising an input rectifying circuit, wherein the isolated switching power supply further comprises: a resonant network controller and a transformer circuit; the transformer circuit comprises: a resonant network circuit and a transformer; The input rectifying circuit is configured to rectify the input alternating current into a direct current output; The resonant network controller is configured to control the resonant network circuit to form different resonant circuits according to the voltage of the direct current outputted by the input rectifying circuit; The resonant network circuit is electrically connected between the input rectifying circuit and the primary side of the transformer; the resonant circuit formed by the resonant network circuit under the control of the resonant network controller is coupled with the transformer, and the DC power output to the input rectifying circuit After the transformer processing, the power supply is output from the secondary side of the transformer. The isolated switching power supply according to claim 1, wherein when the voltage of the DC power source outputted by the input rectifying circuit is within the first voltage segment, the resonant network controller controls the resonant network circuit to form a first resonant circuit When the voltage of the direct current outputted by the input rectifier circuit is in the second voltage segment, the resonant network controller controls the resonant network circuit to form a second resonant circuit; the first voltage segment and the second voltage segment are preset voltages range. The isolated switching power supply of claim 1 , wherein the isolated switching power supply further comprises: an output rectifying and stabilizing circuit; the output rectifying and stabilizing circuit is electrically connected to a secondary side of the transformer for the transformer The secondary side of the output power supply is rectified and regulated. The isolated switching power supply of claim 1 , wherein the isolated switching power supply further comprises: an input voltage detecting circuit electrically connected between the output end of the input rectifying circuit and the input end of the resonant network controller ; The input voltage detecting circuit detects the voltage of the direct current outputted by the input rectifying circuit, and outputs a detection signal to the resonant network controller, where the detecting signal is used to identify a voltage section of the direct current power source; The resonant network controller controls the resonant circuit corresponding to the resonant network circuit according to the detection signal. The isolated switching power supply of claim 1 further comprising: a tank circuit electrically coupled between the output of the input rectifier circuit and the input of the transformer circuit. The isolated switching power supply according to any one of claims 1 to 5, characterized in that The resonant network controller includes: a first output end and a second output end; The transformer circuit includes: a resonant network circuit and a transformer; The resonant network circuit includes: a first switch, a first switch, a first resonant capacitor, a second switch, a second switch, a second resonant capacitor, and an inductor; The first switch tube and the second switch tube are connected in series between the power input end and the ground; the gates of the first switch tube and the second switch tube respectively receive the pulse signals output by the resonant network controller; The inductor, the primary side of the transformer, and the first capacitor are connected in series between the connection node between the first switch tube and the second switch tube and the ground; The first switch is connected in parallel with the inductor, and the control end of the first switch is connected to the first output of the resonant network controller; Both ends of the second switch are connected in parallel with the first capacitor, and the control end of the second switch is connected to the second output of the resonant network controller. The isolated switching power supply according to claim 6, wherein when the resonant network controller controls the first switch to be turned on and the second switch to be turned off, the primary side leakage inductance of the transformer and the first capacitor are connected in series. The connections form a resonant circuit. The isolated switching power supply according to claim 6, wherein when the resonant network controller controls the first switch and the second switch to be turned on, the primary leakage inductance, the first capacitance, and the first The two capacitors form a resonant circuit, wherein the primary side leakage inductance of the transformer and the first capacitor are connected in series, and the second capacitor and the first capacitor are connected in parallel. The isolated switching power supply of claim 6 wherein: When the resonant network controller controls the first switch to be turned off and the second switch to be turned on, the inductor, the primary leakage inductance of the transformer, the first capacitor, and the second capacitor constitute a resonant circuit, wherein the inductor The primary side leakage inductance of the transformer is connected in series with the first capacitor, and the second capacitor is connected in parallel with the first capacitor. The isolated switching power supply according to claim 6, wherein when the resonant network controller controls the first switch and the second switch are both turned off, the inductance, the primary leakage inductance of the transformer, and the first A capacitor constitutes a resonant circuit, wherein the inductor, the primary side leakage inductance of the transformer, and the first capacitor are connected in series. An electronic device comprising the isolated switching power supply of any one of claims 1 to 10.

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