Power supply circuit, circuit control method, power supply device, and electronic device

Abstract

The application relates to the above-mentioned power supply circuit, a circuit control method, a power supply device and an electronic device. The charging and discharging circuit is connected in parallel between the rectifier circuit and the conversion circuit, and the working mode of the charging and discharging circuit is controlled according to the output power of the rectifier circuit and the input power of the conversion circuit through the control circuit, so that energy flows into the charging and discharging circuit only when energy needs to be stored, and energy flows out of the charging and discharging circuit only when energy needs to be released. It can be seen that only a small part of energy in the power supply circuit provided by the embodiment of the application passes through the charging and discharging circuit. Compared with the PFC circuit in the prior art, the energy storage capacity requirement of the charging and discharging circuit provided by the embodiment of the application is smaller, so that the volume of the energy storage circuit in the charging and discharging circuit is smaller, the volume of the charging and discharging circuit is smaller, and the volume of the power supply circuit can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a power supply circuit, a circuit control method, a power supply device and an electronic device. BACKGROUND

[0002] With the development of circuit technology, the structure and function of the power supply circuit are more and more perfect.

[0003] Generally, the output power of the rectifier circuit in the power supply circuit varies with time, but the input power of the conversion circuit in the power supply circuit is usually relatively constant, so a power factor correction (PFC) circuit is arranged in series between the rectifier circuit and the conversion circuit to store and release energy.

[0004] However, the storage unit in the PFC circuit has a large volume, resulting in a large volume of the power supply circuit. SUMMARY

[0005] Therefore, it is necessary to provide a power supply circuit, a circuit control method, a power supply device and an electronic device capable of reducing the volume of the power supply circuit to solve the above technical problems.

[0006] In a first aspect, the present application provides a power supply circuit, comprising: a rectifier circuit, a charge-discharge circuit, a conversion circuit and a control circuit, wherein the charge-discharge circuit is connected in parallel with the rectifier circuit and the conversion circuit respectively, and the control circuit is connected with the charge-discharge circuit;

[0007] The rectifier circuit is configured to convert the input alternating current into direct current.

[0008] The conversion circuit is configured to convert the output voltage of the rectifier circuit.

[0009] The control circuit is configured to control the working mode of the charge-discharge circuit according to the output power of the rectifier circuit and the input power of the conversion circuit, wherein the working mode includes a charging mode, a discharging mode and a non-working mode.

[0010] The charge-discharge circuit is configured to charge according to the output current of the rectifier circuit in the charging mode, discharge to the conversion circuit in the discharging mode, and stop working in the non-working mode.

[0011] In a second aspect, the present application further provides a circuit control method, which is applied to the power supply circuit of the first aspect, and the method comprises:

[0012] The rectifier circuit converts the alternating current input by the rectifier circuit into direct current.

[0013] The conversion circuit converts the output voltage of the rectifier circuit.

[0014] The control circuit controls the working mode of the charge-discharge circuit according to the output power of the rectifier circuit and the input power of the conversion circuit, wherein the working mode includes a charging mode, a discharging mode and a non-working mode.

[0015] The charge-discharge circuit charges according to the output current of the rectifier circuit in the charging mode, discharges to the conversion circuit in the discharging mode, and stops working in the non-working mode.

[0016] In a third aspect, the present application further provides a power supply device comprising the power supply circuit of the first aspect.

[0017] In a fourth aspect, the present application further provides an electronic device comprising the power supply device of the third aspect.

[0018] The power supply circuit, the circuit control method, the power supply device and the electronic device have the following advantages. The charge-discharge circuit in the power supply circuit is connected in parallel between the rectifier circuit and the conversion circuit, and the working mode of the charge-discharge circuit is controlled by the control circuit according to the output power of the rectifier circuit and the input power of the conversion circuit, so that energy flows into the charge-discharge circuit only when energy needs to be stored, and energy flows out of the charge-discharge circuit only when energy needs to be released. It can be seen that only a small part of energy in the power supply circuit provided by the embodiments of the present application flows through the charge-discharge circuit. Compared with the PFC circuit in the prior art, the energy storage capacity requirement of the charge-discharge circuit provided by the embodiments of the present application is smaller, and therefore the volume of the energy storage circuit in the charge-discharge circuit is smaller, so that the volume of the charge-discharge circuit is smaller, thereby reducing the volume of the power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of a power supply circuit in the prior art;

[0020] Figure 2 FIG. 2 is a structural schematic diagram of a power supply circuit provided by an embodiment of the present application;

[0021] Figure 3 FIG. 3 is a structural schematic diagram of a power supply circuit provided by another embodiment of the present application;

[0022] Figure 4 FIG. 4 is a structural schematic diagram of a power supply circuit provided by another embodiment of the present application;

[0023] Figure 5 FIG. 5 is a structural schematic diagram of a power supply circuit provided by another embodiment of the present application;

[0024] Figure 6 FIG. 6 is a measurement waveform diagram provided by an embodiment of the present application; Figure 1 ;

[0025] Figure 7A measurement waveform diagram provided by an embodiment of the present application Figure 2 ;

[0026] Figure 8 A harmonic current component diagram provided by an embodiment of the present application

[0027] Figure 9 A flowchart of a circuit control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0029] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0030] It should be understood that the terms "include / contain" or "have" and the like specify the presence of the stated features, integers, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts or combinations thereof.

[0031] The power supply circuit provided by the embodiments of the present application can be applied to electronic devices. Exemplarily, the electronic devices involved in the embodiments of the present application can include but are not limited to: power adapters, biscuit chargers, mobile power supplies, mobile phones, notebook computers, tablet computers, smart watches, smart bracelets, sweeping machines, wireless earphones, electric toothbrushes or desktop computers.

[0032] Generally, the output power of the rectifier circuit in the power supply circuit varies with time, but the input power of the conversion circuit in the power supply circuit is generally relatively constant, so a power factor correction (PFC) circuit is arranged in series between the rectifier circuit and the conversion circuit, which is used to store and release energy.

[0033] The function of the PFC circuit is to make the performance of the power supply circuit (and its load circuit) more like a pure resistor with respect to the alternating current power supply, specifically to make the input voltage and input current (or the output voltage and output current of the rectifier circuit) of the power supply circuit as in phase as possible and reduce the generation of high-order harmonics (In) as much as possible. The total harmonic distortion can be expressed by the following formula (1), and the power factor (PF) can be expressed by the following formula (2).

[0034]

[0035] wherein THD represents the total harmonic distortion, I n represents the nth harmonic current, and I1 represents the fundamental current. Of course, the total harmonic distortion can also be expressed by other deformations or equivalent formulas of the above formula (1), which are not limited in the embodiments of the present application.

[0036]

[0037] Of course, PF can also be expressed by other deformations or equivalent formulas of the above formula (2), which are not limited in the embodiments of the present application.

[0038] Figure 1 The structure of the power supply circuit in the prior art is shown in FIG. 1, wherein a PFC circuit is connected in series between a rectifier circuit and a conversion circuit, and two ends of a capacitor in the PFC circuit are connected in series to two input ends of the conversion circuit. Figure 1 Since most of the energy in the power supply circuit needs to pass through the PFC circuit, the energy storage capacity requirement of the PFC circuit is relatively large, and thus the volume of the capacitor and the inductor in the PFC circuit is large, resulting in a large volume of the PFC circuit and thus a large volume of the power supply circuit.

[0039] In the embodiments of the present application, the charge and discharge circuit is connected in parallel between the rectifier circuit and the conversion circuit in the power supply circuit, and energy flows into the charge and discharge circuit only when it is detected that energy needs to be stored, and energy flows out of the charge and discharge circuit only when it is detected that energy needs to be released. It can be seen that only a small part of the energy in the power supply circuit of the present application passes through the charge and discharge circuit, and the energy storage capacity requirement of the charge and discharge circuit is smaller than that of the PFC circuit in the prior art. Therefore, the volume of the energy storage circuit in the charge and discharge circuit is small, and thus the volume of the charge and discharge circuit is small, thereby reducing the volume of the power supply circuit.

[0040] The switch tubes involved in the embodiments of the present application can include, but are not limited to, Metal-Oxide-Semiconductor Field-Effect Transistors (MOS tubes) or switch tubes made of Gallium Nitride (GaN) materials, such as Metal-Semiconductor Field Effect Transistors (MESFETs), Heterojunction Field Effect Transistors (HFETs) or Modulation Doped Field Effect Transistors (MODFETs) and the like.

[0041] For the convenience of understanding, the power supply circuit is introduced in the following embodiments of the present application by taking NMOS transistors as examples.

[0042] In one embodiment, Figure 2 The structure schematic diagram of the power supply circuit provided by one embodiment of the present application is shown in FIG. 1, which can include a rectifier circuit 20, a charge-discharge circuit 21, a conversion circuit 22 and a control circuit 23. Figure 2 The rectifier circuit 20 is connected in series with the conversion circuit 22, the charge-discharge circuit 21 is connected in parallel with the rectifier circuit 20 and the conversion circuit 22 (i.e., the charge-discharge circuit 21 is connected in parallel between the rectifier circuit 20 and the conversion circuit 22), and the control circuit 23 is connected with the charge-discharge circuit 21.

[0043] The rectifier circuit 20 in the embodiments of the present application is used to convert the input alternating current into direct current, and the conversion circuit 22 is used to convert the output voltage of the rectifier circuit to obtain the target voltage required by the output. Exemplarily, the conversion circuit 22 in the embodiments of the present application can include, but is not limited to, a Direct Current-Direct Current (DC-DC).

[0044] The control circuit 23 in the embodiments of the present application is used to control the working mode of the charge-discharge circuit 21 according to the output power of the rectifier circuit 20 and the input power of the conversion circuit 22, wherein the working mode can include a charging mode, a discharging mode and a non-working mode.

[0045] The charge-discharge circuit 21 in the embodiments of the present application is used to charge according to the output current of the rectifier circuit 20 in the charging mode, i.e., the energy storage circuit in the charge-discharge circuit 21 stores energy; discharge to the conversion circuit in the discharging mode, i.e., the energy storage circuit in the charge-discharge circuit 21 releases energy; and stop working in the non-working mode, i.e., the energy storage circuit in the charge-discharge circuit 21 is in an open circuit state to stop working.

[0046] It should be understood that in the embodiments of the present application, the control circuit 23 can detect the output power of the rectifier circuit 20 and the input power of the conversion circuit 22 through a detection circuit. Exemplarily, the detection circuit can include but is not limited to a voltage sensor, a current sensor, and / or a resistance voltage divider, etc.

[0047] Exemplarily, the charge-discharge circuit 21 in the embodiments of the present application can be a bidirectional buck circuit (or referred to as BiBuck circuit). Wherein, when the charge-discharge circuit 21 is in the charging mode, the charge-discharge circuit 21 works in the boost mode; when the charge-discharge circuit 21 is in the discharging mode, the charge-discharge circuit 21 works in the buck mode.

[0048] In a possible implementation, the control circuit 23 is configured to determine that energy needs to be stored according to the output power of the rectifier circuit 20 and the input power of the conversion circuit 22, and control the charge-discharge circuit 21 to be in the charging mode so as to flow the energy into the charge-discharge circuit 21 and store the energy into the energy storage circuit in the charge-discharge circuit 21. Exemplarily, the energy storage circuit involved in the embodiments of the present application can include but is not limited to an inductor and a capacitor.

[0049] Exemplarily, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the charging mode when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, i.e., when the energy needs to be stored.

[0050] Exemplarily, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the charging mode when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, and the difference between the output power and the input power is greater than or equal to a first preset difference, i.e., when the energy needs to be stored.

[0051] It should be noted that in the following embodiments of the present application, the control circuit 23 is taken as an example to determine that the energy needs to be stored when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22.

[0052] In another possible implementation, the control circuit 23 is configured to determine that energy needs to be released according to the output power of the rectifier circuit 20 and the input power of the conversion circuit 22, and control the charge-discharge circuit 21 to be in the discharging mode so as to release the energy from the energy storage circuit in the charge-discharge circuit 21, i.e., flow the energy out of the charge-discharge circuit 21.

[0053] Exemplarily, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the discharging mode when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, i.e., when the energy needs to be released.

[0054] For another example, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the discharging mode when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, and the difference between the input power and the output power is greater than or equal to a second preset difference, i.e., energy needs to be released.

[0055] It should be noted that the following examples of the present application are described by taking the control circuit 23 as an example when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, and it is determined that energy needs to be released.

[0056] In another possible implementation, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the non-working mode when it is determined that neither energy needs to be stored nor energy needs to be released according to the output power of the rectifier circuit 20 and the input power of the conversion circuit 22, so that neither energy flows into the charge-discharge circuit 21 nor energy flows out of the charge-discharge circuit 21.

[0057] For example, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the non-working mode when the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22, i.e., neither energy needs to be stored nor energy needs to be released.

[0058] For another example, the control circuit 23 is configured to control the charge-discharge circuit 21 to be in the non-working mode when the absolute value of the difference between the output power of the rectifier circuit 20 and the input power of the conversion circuit 22 is less than a third preset difference, i.e., neither energy needs to be stored nor energy needs to be released.

[0059] It should be noted that the following examples of the present application are described by taking the control circuit 23 as an example when the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22, and it is determined that neither energy needs to be stored nor energy needs to be released.

[0060] In summary, the power supply circuit in the embodiments of the present application has the following advantages. The charge-discharge circuit 21 is connected in parallel between the rectifier circuit 20 and the conversion circuit 22, and the working mode of the charge-discharge circuit 21 is controlled by the control circuit 23 according to the output power of the rectifier circuit 20 and the input power of the conversion circuit 22, so that energy flows into the charge-discharge circuit 21 only when energy needs to be stored, and energy flows out of the charge-discharge circuit 21 only when energy needs to be released. It can be seen that only a small part of energy flows through the charge-discharge circuit 21 in the power supply circuit provided by the embodiments of the present application. Compared with the PFC circuit in the prior art, the energy storage capacity requirement of the charge-discharge circuit 21 is relatively small, and therefore, the volume of the energy storage circuit in the charge-discharge circuit 21 is relatively small, so that the volume of the charge-discharge circuit 21 is relatively small, thereby reducing the volume of the power supply circuit.

[0061] In one embodiment, Figure 3A structure schematic diagram of a power supply circuit is provided for another embodiment of the present application. On the basis of the above-mentioned embodiment, the present embodiment introduces the related content of the charge-discharge circuit 21. As shown in the figure, the charge-discharge circuit 21 in the present embodiment can include a selection circuit 210 and an energy storage circuit 211, wherein the selection circuit 210 is connected with the control circuit 23 and the energy storage circuit 211 respectively, and the energy storage circuit 211 is connected with the rectifier circuit 20 and the conversion circuit 22 in parallel. Figure 3

[0062] In a possible implementation, the control circuit 23 is configured to control the selection circuit 210 to be in the first conduction state when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, so that the selection circuit 210 charges the energy storage circuit 211 with the output current of the rectifier circuit 20 in the first conduction state, thereby controlling the charge-discharge circuit 21 to be in the discharging mode.

[0063] For example, the control circuit 23 can control the selection circuit 210 to be in the first conduction state by controlling the on-off state of each switch tube in the selection circuit 210, so as to charge the energy storage circuit 211 according to the output current of the rectifier circuit 20.

[0064] In another possible implementation, the control circuit 23 is configured to control the selection circuit 210 to be in the second conduction state when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, so that the selection circuit 210 discharges the energy storage circuit 211 in the second conduction state, thereby controlling the charge-discharge circuit 21 to be in the discharging mode.

[0065] For example, the control circuit 23 can control the selection circuit 210 to be in the second conduction state by controlling the on-off state of each switch tube in the selection circuit 210, so as to control the energy storage circuit 211 to discharge.

[0066] In another possible implementation, the control circuit 23 is configured to control the selection circuit 210 to be in the open state when the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22, so that the energy storage circuit 211 in the charge-discharge circuit 21 stops working (neither discharges nor charges), thereby controlling the charge-discharge circuit 21 to be in the non-working mode.

[0067] For example, the control circuit 23 can control the selection circuit 210 to be in the open state by controlling each switch tube in the selection circuit 210 to be in the open state.

[0068] ​In the embodiment of the present application, the control circuit 23 controls the on-off state of the selection circuit 210 in the charge-discharge circuit 21, so as to charge the energy storage circuit 211 in the charge-discharge circuit 21 when energy storage is needed, or discharge the energy storage circuit 211 in the charge-discharge circuit 21 when energy release is needed, so that energy flows into the charge-discharge circuit 21 only when energy storage is needed, and energy flows out of the charge-discharge circuit 21 only when energy release is needed. It can be seen that only a small part of energy in the power supply circuit provided by the embodiment of the present application passes through the charge-discharge circuit 21, and the energy storage capacity requirement of the charge-discharge circuit 21 provided by the embodiment of the present application is small, so that the volume of the energy storage circuit 211 in the charge-discharge circuit 21 is small, and the volume of the charge-discharge circuit 21 is small, thereby the volume of the power supply circuit can be reduced.

[0069] In one embodiment, Figure 4 The structure schematic diagram of the power supply circuit provided by another embodiment of the present application is based on the above-mentioned embodiment, and the related content of the energy storage circuit 211 is introduced in the embodiment of the present application. As shown in the figure, Figure 4 The energy storage circuit 211 in the embodiment of the present application can include an inductor L and a capacitor C1, wherein one end of the inductor L is connected with the rectifier circuit 20, the other end of the inductor L is connected with the first end of the selection circuit 210, the second end of the selection circuit 210 is connected with one end of the capacitor C1, and the third end of the selection circuit 210 and the other end of the capacitor C1 are both grounded. It should be understood that the fourth end of the selection circuit 210 is connected with the control circuit 23, which is used to control the on-off state of each switch tube in the selection circuit 210.

[0070] In one possible implementation, the control circuit 23 is configured to control the selection circuit 210 to be in the first conduction state when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, so that the selection circuit 210 can control the rectifier circuit 20 to charge the inductor L in the first conduction state, and when the current of the inductor L reaches the first threshold value, the selection circuit 210 can control the output current of the rectifier circuit 20 to charge the capacitor C1.

[0071] For example, the control circuit 23 is configured to control the selection circuit 210 to be in the first conduction state when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, so as to turn on the path between the rectifier circuit 20 and the inductor L, and turn off the path between the inductor L and the capacitor C1, so as to charge the inductor L with the output current of the rectifier circuit 20, and when the current of the inductor L reaches the first threshold value, turn on the path between the inductor L and the capacitor C1, so as to charge the capacitor C1 with the output current of the rectifier circuit 20.

[0072] It should be noted that in the present embodiment, the control circuit 23 controls the selection circuit 210 to be in the first conduction state, so that the rectifier circuit 20 charges the inductor L until the current of the inductor L reaches the first threshold value, and the process of controlling the output current of the rectifier circuit 20 to charge the capacitor C1 is a periodic repetition process. The first threshold value can vary with the output power of the rectifier circuit 20, that is, the first threshold value can be different in different periods, or the boost current in the present embodiment is dynamically adjustable.

[0073] It should be understood that in the present embodiment, the control circuit 23 can control the detection circuit to detect the current of the inductor L.

[0074] In another possible implementation, when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, the control circuit 23 can control the selection circuit 210 to be in the second conduction state, so that the selection circuit 210 can control the capacitor C1 to discharge in the second conduction state, and the inductor L can be discharged when the current of the inductor L reaches the second threshold value.

[0075] For example, when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, the control circuit 23 controls the selection circuit 210 to be in the second conduction state, so that the path between the inductor L and the capacitor C1 is turned on to facilitate the discharge of the capacitor C1, and when the current of the inductor L reaches the second threshold value, the path between the rectifier circuit 20 and the inductor L is turned on and the path between the inductor L and the capacitor C1 is turned off to facilitate the discharge of the inductor L.

[0076] It should be noted that in the present embodiment, the control circuit 23 controls the selection circuit 210 to be in the second conduction state, so that the capacitor C1 discharges until the current of the inductor L reaches the second threshold value, and the process of controlling the inductor L to discharge is a periodic repetition process. The second threshold value can vary with the output power of the rectifier circuit 20, that is, the second threshold value can be different in different periods, or the buck current in the present embodiment is dynamically adjustable.

[0077] In another possible implementation, when the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22, the control circuit 23 can control the selection circuit 210 to be in the off state, so as to disconnect the path between the rectifier circuit 20 and the inductor L and the path between the capacitor C1 and the inductor L, so that no energy enters the charge-discharge circuit 21.

[0078] It should be noted that in the present embodiment, the control circuit 23 controls the selection circuit 210 to be in the off state, so that the process of disconnecting the path between the rectifier circuit 20 and the inductor L and the path between the capacitor C1 and the inductor L is a periodically repeated process.

[0079] In the present embodiment, the control circuit 23 controls the on-off state of the selection circuit 210 in the charge-discharge circuit 21 to charge the inductor L and the capacitor C1 in the energy storage circuit 211 when energy needs to be stored, or to discharge the inductor L and the capacitor C1 in the energy storage circuit 211 when energy needs to be released, so that energy only flows into the energy storage circuit 211 when energy needs to be stored, and energy only flows out of the energy storage circuit 211 when energy needs to be released. It can be seen that only a small part of the energy in the power supply circuit provided in the present embodiment passes through the energy storage circuit 211, and the energy storage capacity requirement of the energy storage circuit 211 provided in the present embodiment is relatively small. Therefore, the volume of the capacitor C1 and the inductor L in the energy storage circuit 211 is relatively small, so that the volume of the charge-discharge circuit 21 is relatively small, thereby reducing the volume of the power supply circuit.

[0080] In one embodiment, Figure 5 The structure of the power supply circuit provided in another embodiment of the present application is shown in the figure. Based on the above embodiment, the present embodiment introduces the related content of the selection circuit 210. As shown in the figure, Figure 5 The selection circuit 210 in the present embodiment can include a first switch tube Q1 and a second switch tube Q2. The first end of the first switch tube Q1 is connected to the inductor L and the second end of the second switch tube Q2, respectively. The second end of the first switch tube Q1 is connected to the capacitor C1. The first end of the second switch tube Q2 is grounded. The third end of the first switch tube Q1 and the third end of the second switch tube Q2 are both connected to the control circuit 23.

[0081] It should be understood that the control circuit 23 is used to send a first control signal to the first switch tube Q1 and / or a second control signal to the second switch tube Q2, wherein the first control signal is used to control the on-off state of the first switch tube Q1, and the second control signal is used to control the on-off state of the second switch tube Q2. Exemplarily, the control signal (such as the first control signal or the second control signal) involved in the present embodiment can include but is not limited to a pulse width modulation (PWM) signal.

[0082] In one possible implementation, the control circuit 23 is configured to, when the output power of the rectifier circuit 20 is greater than the input power of the conversion circuit 22, control the second switch Q2 to be turned on so as to turn on the path between the rectifier circuit 20 and the inductor L, and control the first switch Q1 to be turned off so as to turn off the path between the inductor L and the capacitor C1, so that the output current of the rectifier circuit 20 charges the inductor L until the current of the inductor L reaches a first threshold value, and then control the first switch Q1 to be turned on and the second switch Q2 to be turned off so as to turn on the path between the inductor L and the capacitor C1, so that the output current of the rectifier circuit 20 charges the capacitor C1.

[0083] In another possible implementation, the control circuit 23 is configured to, when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, control the first switch Q1 to be turned on and the second switch Q2 to be turned off so as to turn on the path between the inductor L and the capacitor C1, so that the capacitor C1 is discharged until the current of the inductor reaches a second threshold value, and then control the first switch Q1 to be turned off and the second switch Q2 to be turned on so as to turn on the path between the rectifier circuit 20 and the inductor L and turn off the path between the inductor L and the capacitor C1, so that the inductor L is discharged.

[0084] It should be noted that, when the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22, the control circuit 23 can also first control the first switch Q1 to be turned off and the second switch Q2 to be turned on so as to turn on the path between the rectifier circuit 20 and the inductor L until the current of the inductor reaches a third threshold value, and then control the first switch Q1 to be turned on and the second switch Q2 to be turned off so as to turn on the path between the inductor L and the capacitor C1, so that the capacitor C1 is discharged. Further, when the current of the inductor reaches the second threshold value, the control circuit 23 controls the first switch Q1 to be turned off and the second switch Q2 to be turned on so as to turn on the path between the rectifier circuit 20 and the inductor L and turn off the path between the inductor L and the capacitor C1, so that the inductor L is discharged.

[0085] In another possible implementation, the control circuit 23 is configured to, when the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22, control the first switch Q1 and the second switch Q2 to be turned off so as to turn off the path between the rectifier circuit 20 and the inductor L and the path between the capacitor C1 and the inductor L.

[0086] For ease of understanding, the working process of the power supply circuit is introduced in the following embodiments.

[0087] As Figure 5As shown, the power supply circuit in this embodiment may further include a decoupling circuit 24, wherein one end of the decoupling circuit is connected to the rectifier circuit 20, and the other end of the decoupling circuit 20 is grounded. The decoupling circuit 24 is used to reduce mutual interference between the preceding and following stages of the decoupling circuit 20. The preceding stage of the decoupling circuit 20 may include the rectifier circuit 20, and the following stage of the decoupling circuit 20 may include a converter circuit 22. Exemplarily, the decoupling circuit 24 may include, but is not limited to, the following: Figure 5 The capacitor C2 shown.

[0088] Figure 6 Schematic diagram of measurement waveforms provided for embodiments of this application Figure 1 ,like Figure 6 As shown, 1) Assuming that between time period t1 and t2, when the control circuit 23 detects that the output power of the rectifier circuit 20 is equal to the input power of the converter circuit 22 through the detection circuit, it can control the first switch Q1 and the second switch Q2 to be turned off, thereby disconnecting the path between the rectifier circuit 20 and the inductor L, as well as the path between the capacitor C1 and the inductor L, so that the charging and discharging circuit 21 is in a non-working mode.

[0089] 2) Assuming that between time periods t2 and t3, when the control circuit 23 detects that the output power of the rectifier circuit 20 is greater than the input power of the converter circuit 22, it controls the second switch Q2 to turn on and the first switch Q1 to turn off, so that the output current of the rectifier circuit 20 charges the inductor L (the inductor current I1 flows from left to right), until the current I1 of the inductor L increases from zero to a first threshold, then it controls the first switch Q1 to turn on and the second switch Q2 to turn off, so that the output current of the rectifier circuit 20 charges the capacitor C1 through the inductor L (the inductor current I1 flows from left to right). Further, when the inductor current I1 decreases from the first threshold to zero, the control circuit 23 controls the second switch Q2 to turn on and the first switch Q1 to turn off, so that the output current of the rectifier circuit 20 charges the inductor L, and so on, periodically cycling until the output power of the rectifier circuit 20 is no greater than the input power of the converter circuit 22. Figure 6 As shown, when the charging and discharging circuit 21 is in charging mode, the voltage V1 of capacitor C1 and the voltage V2 of capacitor C2 will gradually increase.

[0090] It should be understood that the first threshold can vary with the output power of the rectifier circuit 20, so that the boost current in this embodiment is dynamically adjustable, so that the waveform of the output current I3 of the rectifier circuit 20 can be further optimized, and the waveform of the output current I3 is closer to the desired waveform (such as a sine wave).

[0091] 3) Assuming that during the time period t3-t4, the control circuit 23 detects that the output power of the rectifier circuit 20 is equal to the input power of the conversion circuit 22 through the detection circuit, the control circuit 23 can control the first switch Q1 and the second switch Q2 to be both off, so as to disconnect the path between the rectifier circuit 20 and the inductor L, and the path between the capacitor C1 and the inductor L, thereby the charge-discharge circuit 21 is in the non-working mode. As shown in FIG. 2B, when the charge-discharge circuit 21 is in the non-working mode, the voltage V1 of the capacitor C1 remains unchanged, but the voltage V2 of the capacitor C2 gradually decreases. Figure 6

[0092] 4) Assuming that during the time period t4-t5, the control circuit 23 detects that the output power of the rectifier circuit 20 is less than the input power of the conversion circuit 22 through the detection circuit, the control circuit 23 controls the first switch Q1 to be on and the second switch Q2 to be off, so as to discharge the capacitor C1 (the current I2 of the inductor flows from right to left), until the current I2 of the inductor L increases from zero to the second threshold value, the control circuit 23 controls the first switch Q1 to be off and the second switch Q2 to be on, so as to discharge the inductor L (the current I2 of the inductor flows from right to left). Further, when the current I2 of the inductor L decreases from the second threshold value to zero, the control circuit 23 controls the first switch Q1 to be on and the second switch Q2 to be off, so as to discharge the capacitor C1, and so on periodically until the output power of the rectifier circuit 20 is not less than the input power of the conversion circuit 22. As shown in FIG. 2C, when the charge-discharge circuit 21 is in the discharging mode, the voltage V1 of the capacitor C1 gradually decreases, but the voltage V2 of the capacitor C2 first gradually increases and then gradually decreases. Figure 6

[0093] It should be understood that the second threshold value can vary with the size of the output power of the rectifier circuit 20, so that the buck current in the embodiment of the present application is dynamically adjustable, so that the waveform of the output current I3 of the rectifier circuit 20 can be more optimized, so that the waveform of the output current I3 is closer to the desired waveform (such as a sine wave).

[0094] It should be understood that if the inductor current flowing from left to right is positive current, the first threshold value in the embodiment of the present application is a positive integer, and the second threshold value is a negative integer.

[0095] It should be noted that the working process of the subsequent time period is similar to the process of the time period t1-t5, which will not be introduced here.

[0096] Figure 7 The measurement waveform provided by the embodiment of the present application Figure 2 , Figure 8 The harmonic current component diagram provided by the embodiment of the present application, combined with Figure 7 and Figure 8 ​​As shown, in the embodiment of the present application, the charging and discharging circuit 21 is connected in parallel between the rectifier circuit 20 and the conversion circuit 22, and then the working mode and current size of the charging and discharging circuit 21 are adjusted by controlling the on-off state of the first switch Q1 and the second switch Q2 in the selection circuit 210 through the control circuit 23, so that the volume of the charging and discharging circuit 21 can be reduced, and the output current I3 waveform of the rectifier circuit 20 can be optimized to be closer to the expected waveform (such as a sine wave) by controlling the working mode of the charging and discharging circuit 21, so that the output current I3 waveform is closer to the expected waveform (such as a sine wave), as shown in the following figure. Figure 7 As shown, the harmonic current of the output current I3 is small after Fourier transform.

[0097] In summary, in the embodiment of the present application, only a small part of the energy passes through the charging and discharging circuit 21, and the energy storage capacity requirement of the charging and discharging circuit 21 is smaller than that of the PFC circuit in the prior art, so the capacity of the capacitor C1 in the charging and discharging circuit 21 is smaller, and the capacitor C1 in the embodiment of the present application can be selected as a high-voltage ceramic capacitor or a thin-film capacitor, and in combination with the parallel connection of the charging and discharging circuit 21, the voltage V1 of the capacitor C1 can be changed according to Figure 7 As shown, the voltage V1 of the capacitor C1 in the embodiment of the present application can have a large range.

[0098] It should be understood that since the output power of the rectifier circuit 20 changes regularly with the power frequency cycle, the input power of the conversion circuit 22 is relatively constant, so the energy required to be stored and released in each half power frequency cycle is a constant value ΔW = 1 / 2*C*(Vmax2-Vmin2).

[0099] Since the voltage V1 of the capacitor C1 in the embodiment of the present application can have a large range, that is, the difference between the maximum voltage Vmax and the minimum voltage Vmin is large, when the same energy needs to be stored, the capacity of the capacitor C1 in the embodiment of the present application can be much smaller than that of the energy storage capacitor in the PFC circuit.

[0100] For example, the voltage V1 of the capacitor C1 in the embodiment of the present application can fluctuate between 200V and 410V, which is much larger than the fluctuation range of the energy storage capacitor in the conventional PFC circuit (usually within 10V), so the capacitance of C1 can be greatly reduced.

[0101] In the conventional technology, the PFC circuit is connected in series between the rectifier circuit and the conversion circuit, and the inductor in the PFC circuit is connected in series between the rectifier circuit and the conversion circuit. In the power supply circuit, the current of the "output power" and the current of the "stored energy" need to pass through the inductor in the PFC circuit (the current of the "released energy" flows from the capacitor in the PFC circuit to the conversion circuit). In the embodiment of the present application, the charge-discharge circuit 21 is connected in parallel between the rectifier circuit 20 and the conversion circuit 22 in the power supply circuit, so that the current I1 of the "stored energy" and the current I2 of the "released energy" pass through the inductor L in the charge-discharge circuit 21, but the current I4 of the "output power" does not pass through the charge-discharge circuit 21. Therefore, in the embodiment of the present application, the current flowing through the inductor L is reduced, and thus the equivalent series resistance (ESR) of the inductor L can be larger under the same loss, so that the volume of the inductor L can be smaller.

[0102] In the conventional PFC circuit, the capacitance of the capacitor and the input power of the conversion circuit are positively correlated. For example, if the input power of the conversion circuit is 100w, the capacitance of the capacitor in the PFC circuit is 100u; if the input power of the conversion circuit is 80w, the capacitance of the capacitor in the PFC circuit is 80u. In contrast, by using the power supply circuit provided in the embodiment of the present application, the capacitance of the capacitor C1 in the charge-discharge circuit can be smaller (for example, 6u), and the capacitance of the inductor L1 can also be smaller (for example, the diameter is 8mm and the thickness is 5mm), so that the 17625-1D class equipment standard can be met.

[0103] In summary, compared with the conventional PFC circuit, the volume of the capacitor and the inductor in the charge-discharge circuit 21 in the embodiment of the present application can be smaller, and thus the volume of the charge-discharge circuit 21 is smaller, so that the volume of the power supply circuit is smaller, and thus a better PFC solution can be provided for the electronic device with large power and small volume.

[0104] It should be understood that, in the above embodiments of the present application, the input power of the conversion circuit is relatively constant. If the input power of the conversion circuit is not constant (for example, the first generation of biscuit charger with pulse charging), the power supply circuit provided in the embodiment of the present application can reduce the required "stored energy" and / or the required "released energy" to a greater extent, so that the volume of the power supply circuit can be further reduced.

[0105] In one embodiment, Figure 9 The flowchart of the circuit control method provided in one embodiment of the present application can be applied to the power supply circuit provided in the above embodiments of the present application. As shown in Figure 9As shown, the method of the embodiment of the application can include the following steps:

[0106] Step S901, the rectifier circuit converts the alternating current input by the rectifier circuit into direct current;

[0107] Step S902, the conversion circuit transforms the output voltage of the rectifier circuit;

[0108] Step S903, the control circuit controls the working mode of the charge-discharge circuit according to the output power of the rectifier circuit and the input power of the conversion circuit.

[0109] The working mode in the embodiment of the application includes a charging mode, a discharging mode and a non-working mode.

[0110] Step S904, the charge-discharge circuit charges according to the output current of the rectifier circuit in the charging mode, discharges to the conversion circuit in the discharging mode, and stops working in the non-working mode.

[0111] In one embodiment, the control circuit controls the working mode of the charge-discharge circuit according to the output power of the rectifier circuit and the input power of the conversion circuit, including:

[0112] The control circuit controls the charge-discharge circuit to be in the charging mode when the output power is greater than the input power; or, controls the charge-discharge circuit to be in the discharging mode when the output power is less than the input power; or,

[0113] The control circuit controls the charge-discharge circuit to be in the discharging mode when the output power is less than the input power; or,

[0114] The control circuit controls the charge-discharge circuit to be in the non-working mode when the output power is equal to the input power.

[0115] In one embodiment, the control circuit controls the charge-discharge circuit to be in the charging mode when the output power is greater than the input power, including:

[0116] The control circuit controls the selection circuit to be in the first conduction state when the output power is greater than the input power.

[0117] The selection circuit, in the first conduction state, causes the output current of the rectifier circuit to charge the energy storage circuit.

[0118] In one embodiment, the selection circuit, in the first conduction state, causes the output current of the rectifier circuit to charge the energy storage circuit, including:

[0119] The selection circuit, in the first conduction state, controls the rectifier circuit to charge the inductor, and controls the output current of the rectifier circuit to charge the capacitor when the current of the inductor reaches a first threshold.

[0120] In one embodiment, the selection circuit controls the rectifier circuit to charge the inductor in the first conduction state, and controls the output current of the rectifier circuit to charge the capacitor in the case that the current of the inductor reaches the first threshold value, comprising:

[0121] The selection circuit turns on the path between the rectifier circuit and the inductor in the first conduction state, and turns off the path between the inductor and the capacitor, so that the output current of the rectifier circuit charges the inductor, and in the case that the current of the inductor reaches the first threshold value, the path between the inductor and the capacitor is turned on, so that the output current of the rectifier circuit charges the capacitor.

[0122] In one embodiment, the selection circuit controls the rectifier circuit to charge the inductor in the first conduction state, and controls the output current of the rectifier circuit to charge the capacitor in the case that the current of the inductor reaches the first threshold value, comprising:

[0123] The control circuit controls the second switch in the selection circuit to be turned on and the first switch to be turned off when the output power is greater than the input power, so that the output current of the rectifier circuit charges the inductor, and in the case that the current of the inductor reaches the first threshold value, the first switch is controlled to be turned on and the second switch is controlled to be turned off, so that the output current of the rectifier circuit charges the capacitor.

[0124] In one embodiment, the control circuit controls the charge-discharge circuit to be in the discharge mode when the output power is less than the input power, comprising:

[0125] The control circuit controls the selection circuit to be in the second conduction state when the output power is less than the input power.

[0126] The selection circuit discharges the energy storage circuit in the second conduction state.

[0127] In one embodiment, the selection circuit discharges the energy storage circuit in the second conduction state, comprising:

[0128] The selection circuit controls the capacitor to discharge in the second conduction state, and controls the inductor to discharge in the case that the current of the inductor reaches the second threshold value.

[0129] In one embodiment, the selection circuit controls the capacitor to discharge in the second conduction state, and controls the inductor to discharge in the case that the current of the inductor reaches the second threshold value, comprising:

[0130] The selection circuit turns on the path between the inductor and the capacitor in the second conduction state, so that the capacitor discharges, and in the case that the current of the inductor reaches the second threshold value, the path between the rectifier circuit and the inductor is turned on, and the path between the inductor and the capacitor is turned off, so that the inductor discharges.

[0131] In one embodiment, the selection circuit turns on the path between the inductor and the capacitor in the second conducting state, so that the capacitor discharges, and turns on the path between the rectifier circuit and the inductor and turns off the path between the inductor and the capacitor when the current of the inductor reaches the second threshold, so that the inductor discharges, comprising:

[0132] The control circuit controls the first switch in the selection circuit to turn on and the second switch to turn off when the output power is less than the input power, so that the capacitor discharges, and controls the first switch to turn off and the second switch to turn on when the current of the inductor reaches the second threshold, so that the inductor discharges.

[0133] In one embodiment, the control circuit controls the charge-discharge circuit to be in a non-working mode when the output power is equal to the input power, comprising:

[0134] The control circuit controls the selection circuit to be in an open circuit state when the output power is equal to the input power.

[0135] The selection circuit stops the energy storage circuit from working in the open circuit state.

[0136] In one embodiment, the selection circuit stops the energy storage circuit from working in the open circuit state, comprising:

[0137] The selection circuit turns off the path between the rectifier circuit and the inductor and the path between the capacitor and the inductor in the open circuit state.

[0138] In one embodiment, the selection circuit turns off the path between the rectifier circuit and the inductor and the path between the capacitor and the inductor in the open circuit state, comprising:

[0139] The control circuit controls the first switch and the second switch in the selection circuit to both turn off when the output power is equal to the input power.

[0140] The circuit control method provided by the embodiments of the present application can be applied to the power supply circuit provided by the above-mentioned embodiments of the present application, and has similar implementation principles and technical effects, which will not be described here.

[0141] In one embodiment, a power supply device is provided, comprising the power supply circuit provided in the above-mentioned embodiments of the present application, and has similar implementation principles and technical effects, which will not be described here.

[0142] In one embodiment, an electronic device is provided, comprising the power supply device provided in the above-mentioned embodiments of the present application, and has similar implementation principles and technical effects, which will not be described here.

[0143] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations of technical features do not have contradictions, they shall be considered within the scope of the present disclosure.

[0144] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a rectifier circuit, a charging / discharging circuit, a conversion circuit, and a control circuit. The charging / discharging circuit is connected in parallel with both the rectifier circuit and the conversion circuit, and the control circuit is connected to the charging / discharging circuit. The charging / discharging circuit includes: a selection circuit and an energy storage circuit. The selection circuit is connected to both the control circuit and the energy storage circuit, and the energy storage circuit is connected in parallel with both the rectifier circuit and the conversion circuit. The energy storage circuit includes an inductor and a capacitor. The rectifier circuit is used to convert the input alternating current into direct current. The conversion circuit is used to convert the output voltage of the rectifier circuit; The control circuit is configured to: determine that energy needs to be stored when the output power of the rectifier circuit is greater than the input power of the converter circuit, and control the charging and discharging circuit to be in charging mode; determine that energy needs to be released when the output power is less than the input power, and control the charging and discharging circuit to be in discharging mode; and determine that neither energy needs to be stored nor energy needs to be released when the output power is equal to the input power, and control the charging and discharging circuit to be in non-operating mode. The charging and discharging circuit is used to charge the rectifier circuit according to the output current of the rectifier circuit in the charging mode, to discharge the converter circuit in the discharging mode, and to stop working in the non-working mode. Specifically, when the output power is greater than the input power, the output current of the rectifier circuit charges the inductor until the inductor current increases from zero to a first threshold. Then, the output current of the rectifier circuit charges the capacitor through the inductor until the inductor current decreases from the first threshold to zero. This cycle repeats periodically until the output power is no greater than the input power. The first threshold varies with the output power of the rectifier circuit. When the charging / discharging circuit is in the charging mode, the voltage of the capacitor gradually increases. When the charging / discharging circuit is in the discharging mode, the voltage of the capacitor gradually decreases.

2. The circuit according to claim 1, characterized in that, The control circuit is configured to: determine that energy needs to be stored when the output power is greater than the input power, and control the selection circuit to be in a first conducting state; determine that energy needs to be released when the output power is less than the input power, and control the selection circuit to be in a second conducting state; and determine that neither energy needs to be stored nor energy needs to be released when the output power is equal to the input power, and control the selection circuit to be in an open-circuit state. The selection circuit is used to charge the energy storage circuit with the output current of the rectifier circuit in the first conducting state. In the second on state, the energy storage circuit is discharged; in the off state, the energy storage circuit stops working.

3. The circuit according to claim 2, characterized in that, One end of the inductor is connected to the rectifier circuit, the other end of the inductor is connected to the first end of the selection circuit, the second end of the selection circuit is connected to one end of the capacitor, and the third end of the selection circuit and the other end of the capacitor are both grounded. The selection circuit is used to control the rectifier circuit to charge the inductor in the first on state, until the current of the inductor reaches a first threshold, and then control the output current of the rectifier circuit to charge the capacitor; or... The selection circuit is used to control the capacitor to discharge in the second on state until the current of the inductor reaches a second threshold, at which point it controls the inductor to discharge; or... The selection circuit is used to disconnect the path between the rectifier circuit and the inductor, and the path between the capacitor and the inductor, in the open-circuit state.

4. The circuit according to claim 3, characterized in that, The selection circuit is configured to open the path between the rectifier circuit and the inductor in the first on state, and to close the path between the inductor and the capacitor, so that the output current of the rectifier circuit charges the inductor until the current of the inductor reaches the first threshold, at which point the path between the inductor and the capacitor is opened, so that the output current of the rectifier circuit charges the capacitor; or... The selection circuit is used to open the path between the inductor and the capacitor in the second conduction state, so that the capacitor discharges, until the current of the inductor reaches the second threshold, then open the path between the rectifier circuit and the inductor, and close the path between the inductor and the capacitor, so that the inductor discharges.

5. The circuit according to claim 4, characterized in that, The selection circuit includes a first switching transistor and a second switching transistor, wherein the first terminal of the first switching transistor is connected to the inductor and the second terminal of the second switching transistor respectively, the second terminal of the first switching transistor is connected to the capacitor, the first terminal of the second switching transistor is grounded, and the third terminals of the first switching transistor and the second switching transistor are both connected to the control circuit. The control circuit is configured to, when the output power is greater than the input power, control the second switch to turn on and the first switch to turn off, so that the output current of the rectifier circuit charges the inductor, until the current of the inductor reaches the first threshold, then control the first switch to turn on and the second switch to turn off, so that the output current of the rectifier circuit charges the capacitor; or... The control circuit is configured to, when the output power is less than the input power, control the first switch to turn on and the second switch to turn off, causing the capacitor to discharge, until the inductor current reaches the second threshold, at which point it controls the first switch to turn off and the second switch to turn on, causing the inductor to discharge; or... The control circuit is used to control both the first switch and the second switch to be turned off when the output power is equal to the input power.

6. The circuit according to any one of claims 1-5, characterized in that, The power supply circuit further includes a decoupling circuit, one end of which is connected to the rectifier circuit, and the other end of which is grounded. The decoupling circuit is used to reduce the mutual interference between the rectifier circuit and the converter circuit.

7. A circuit control method, characterized in that, The circuit control method is applied to the power supply circuit according to any one of claims 1-6, and the method includes: The rectifier circuit converts the AC power input to the rectifier circuit into DC power; The conversion circuit transforms the output voltage of the rectifier circuit; When the output power of the rectifier circuit is greater than the input power of the converter circuit, the control circuit determines that energy needs to be stored and controls the charging and discharging circuit to be in charging mode; when the output power is less than the input power, the control circuit determines that energy needs to be released and controls the charging and discharging circuit to be in discharging mode; when the output power is equal to the input power, the control circuit determines that neither energy needs to be stored nor energy needs to be released and controls the charging and discharging circuit to be in non-operating mode. The charging and discharging circuit charges according to the output current of the rectifier circuit in the charging mode, discharges to the converter circuit in the discharging mode, and stops working in the non-working mode.

8. The method according to claim 7, characterized in that, When the output power of the rectifier circuit is greater than the input power of the converter circuit, the control circuit determines that energy needs to be stored and controls the charging and discharging circuit to be in charging mode, including: When the output power is greater than the input power, the control circuit determines that energy needs to be stored and controls the selection circuit to be in the first conduction state. When the selection circuit is in the first conducting state, the output current of the rectifier circuit charges the energy storage circuit.

9. The method according to claim 8, characterized in that, When the selection circuit is in the first on state, it causes the output current of the rectifier circuit to charge the energy storage circuit, including: In the first on state, the selection circuit controls the rectifier circuit to charge the inductor until the current of the inductor reaches a first threshold, and then controls the output current of the rectifier circuit to charge the capacitor.

10. The method according to claim 9, characterized in that, The selection circuit controls the rectifier circuit to charge the inductor in the first on state until the current of the inductor reaches a first threshold, and then controls the output current of the rectifier circuit to charge the capacitor, including: In the first conducting state, the selection circuit opens the path between the rectifier circuit and the inductor, and closes the path between the inductor and the capacitor, so that the output current of the rectifier circuit charges the inductor until the current of the inductor reaches the first threshold. Then, the path between the inductor and the capacitor is opened, so that the output current of the rectifier circuit charges the capacitor.

11. The method according to claim 10, characterized in that, The selection circuit, in the first on state, opens the path between the rectifier circuit and the inductor, and closes the path between the inductor and the capacitor, so that the output current of the rectifier circuit charges the inductor. When the current of the inductor reaches the first threshold, the path between the inductor and the capacitor is opened, so that the output current of the rectifier circuit charges the capacitor. This includes: When the output power is greater than the input power, the control circuit controls the second switch in the selection circuit to turn on and the first switch to turn off, so that the output current of the rectifier circuit charges the inductor until the current of the inductor reaches the first threshold. Then, the control circuit controls the first switch to turn on and the second switch to turn off, so that the output current of the rectifier circuit charges the capacitor.

12. The method according to claim 7, characterized in that, When the output power is less than the input power, the control circuit determines that energy needs to be released and controls the charging and discharging circuit to be in discharge mode, including: When the output power is less than the input power, the control circuit determines that energy needs to be released and controls the selection circuit to be in the second conduction state. When the selection circuit is in the second on state, it causes the energy storage circuit to discharge.

13. The method according to claim 12, characterized in that, When the selection circuit is in the second on state, it causes the energy storage circuit to discharge, including: The selection circuit controls the capacitor to discharge in the second conduction state until the current in the inductor reaches the second threshold, and then controls the inductor to discharge.

14. The method according to claim 13, characterized in that, The selection circuit controls the capacitor to discharge in the second on state until the inductor current reaches the second threshold, and then controls the inductor to discharge, including: In the second conduction state, the selection circuit conducts the path between the inductor and the capacitor, causing the capacitor to discharge, until the current of the inductor reaches the second threshold. Then, the circuit conducts the path between the rectifier circuit and the inductor, and turns off the path between the inductor and the capacitor, causing the inductor to discharge.

15. The method according to claim 14, characterized in that, The selection circuit, in the second conduction state, conducts the path between the inductor and the capacitor, causing the capacitor to discharge, until the current of the inductor reaches the second threshold, then conducts the path between the rectifier circuit and the inductor, and shuts off the path between the inductor and the capacitor, causing the inductor to discharge, including: When the output power is less than the input power, the control circuit controls the first switch in the selection circuit to turn on and the second switch to turn off, so that the capacitor discharges. When the current of the inductor reaches the second threshold, the control circuit controls the first switch to turn off and the second switch to turn on, so that the inductor discharges.

16. The method according to claim 7, characterized in that, When the output power equals the input power, the control circuit determines that neither energy storage nor energy release is needed, and controls the charging and discharging circuit to be in a non-operating mode, including: When the output power equals the input power, the control circuit determines that neither energy storage nor energy release is required, and controls the selection circuit to be in an open circuit state. The selection circuit causes the energy storage circuit to stop working when the circuit is open.

17. The method according to claim 16, characterized in that, The selection circuit, under the open-circuit state, causes the energy storage circuit to stop working, including: The selection circuit disconnects the path between the rectifier circuit and the inductor, as well as the path between the capacitor and the inductor, in the open-circuit state.

18. The method according to claim 17, characterized in that, The selection circuit disconnects the path between the rectifier circuit and the inductor, and the path between the capacitor and the inductor, in the open-circuit state, including: When the output power equals the input power, the control circuit controls both the first and second switching transistors in the selection circuit to turn off.

19. A power supply device, characterized in that, Includes the power supply circuit as described in any one of claims 1-6.

20. An electronic device, characterized in that, Includes the power supply device as described in claim 19.

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