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

Abstract

The application relates to the power supply circuit, the circuit control method, the power supply device and the electronic equipment, the energy storage circuit is connected in parallel between the rectifier circuit and the voltage stabilizing circuit, the working mode is adjusted according to the output power of the rectifier circuit and the input power of the voltage stabilizing circuit, so that energy flows into the energy storage circuit only when energy needs to be stored, and energy flows out of the energy storage circuit only when energy needs to be released. On the other hand, the output power of the conversion circuit is adjusted according to the change of the input voltage of the rectifier circuit, so that the output power of the conversion circuit can change with the change of the input voltage (or input power) of the rectifier circuit, so that the power supply circuit can be flexibly applied to various scenes, and the energy storage capacity requirement of the energy storage circuit of the application embodiment is further reduced, so that the volume of the power supply circuit can be reduced.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a power supply circuit, a circuit control method, a power supply device, and an electronic device. Background Technology

[0002] With the development of circuit technology, the structure and function of power supply circuits have become increasingly sophisticated.

[0003] In traditional technology, the input power of the rectifier circuit in the power supply circuit varies with time, while the input power of the voltage regulator circuit in the power supply circuit is usually constant. Therefore, a power factor correction (PFC) circuit is connected in series between the rectifier bridge circuit and the voltage regulator circuit to store and release energy.

[0004] In traditional technology, the output power of the voltage regulator circuit in a power supply circuit is usually a constant value. Summary of the Invention

[0005] Therefore, it is necessary to provide a power supply circuit, circuit control method, power supply device, and electronic device that can be flexibly applied to various scenarios to address the above-mentioned technical problems.

[0006] In a first aspect, this application provides a power supply circuit, which includes: a rectifier circuit, an energy storage circuit, a voltage regulator circuit, and a converter circuit; the energy storage circuit is connected in parallel with the rectifier circuit and the voltage regulator circuit, and the converter circuit is connected in parallel with the voltage regulator circuit and the rectifier circuit.

[0007] A rectifier circuit is used to convert input alternating current (AC) into direct current (DC).

[0008] The energy storage circuit is used to adjust the operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit; the operating mode includes charging mode, discharging mode and non-operating mode.

[0009] A voltage regulator circuit is used to regulate and transform the output voltage of the rectifier circuit according to the operating mode of the energy storage circuit.

[0010] A converter circuit is used to adjust the output power of the converter circuit according to the input voltage of the rectifier circuit.

[0011] Secondly, this application also provides a circuit control method, which is applied to the power supply circuit of the first aspect described above. The method includes:

[0012] The rectifier circuit converts the input alternating current (AC) into direct current (DC);

[0013] The energy storage circuit adjusts its operating mode based on the output power of the rectifier circuit and the input power of the voltage regulator circuit; the operating modes include charging mode, discharging mode and non-operating mode.

[0014] The voltage regulator circuit regulates and transforms the output voltage of the rectifier circuit according to the operating mode of the energy storage circuit.

[0015] The converter circuit adjusts its output power based on the input voltage of the rectifier circuit.

[0016] Thirdly, this application also provides a power supply device, including the power supply circuit described in the first aspect.

[0017] Fourthly, this application also provides an electronic device including the power supply device described in the third aspect above.

[0018] The aforementioned power supply circuit, circuit control method, power supply device, and power supply equipment, on the one hand, connect the energy storage circuit in parallel between the rectifier circuit and the voltage regulator circuit, and adjust the operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit. This ensures that energy flows into the energy storage circuit only when energy storage is needed, and energy flows out of the energy storage circuit only when energy release is needed. Therefore, only a small portion of the energy in the power supply circuit provided in this application embodiment passes through the energy storage circuit, and the energy storage capacity requirement of the energy storage circuit provided in this application embodiment is smaller compared to the PFC circuit in the traditional technology. On the other hand, by adjusting the output power of the conversion circuit according to the change of the input voltage of the rectifier circuit, the output power of the conversion circuit can change with the change of the input voltage (or input power) of the rectifier circuit. Therefore, not only can the power supply circuit be flexibly applied to various scenarios, enriching the applicable scenarios of the power supply circuit in this application embodiment, but the energy storage capacity requirement of the energy storage circuit in this application embodiment is further reduced. In summary, compared with the PFC circuit in the power supply circuit of the traditional technology, the energy storage circuit provided in this application embodiment has a smaller energy storage capacity requirement. Therefore, the energy storage device in the energy storage circuit is smaller, which makes the energy storage circuit smaller and thus reduces the size of the power supply circuit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the input voltage and input current of a rectifier circuit under ideal conditions.

[0020] Figure 2 This is a schematic diagram of the input power of a rectifier circuit under ideal conditions.

[0021] Figure 3 This is a schematic diagram of a power supply circuit in a traditional technology.

[0022] Figure 4This is a schematic diagram of the power supply circuit provided in one embodiment of this application;

[0023] Figure 5 A schematic diagram of the output current of the conversion circuit provided in the embodiments of this application;

[0024] Figure 6 A schematic diagram of the power supply circuit provided in another embodiment of this application;

[0025] Figure 7 A schematic diagram of the power supply circuit provided in another embodiment of this application;

[0026] Figure 8 A schematic diagram of the power supply circuit provided in another embodiment of this application;

[0027] Figure 9 A schematic diagram of the power supply circuit provided in another embodiment of this application;

[0028] Figure 10 A schematic diagram of the power supply circuit provided in another embodiment of this application;

[0029] Figure 11 This is a schematic diagram of the power supply circuit provided in another embodiment of this application;

[0030] Figure 12 A schematic diagram of the voltage waveform Vac and the corresponding control signal Csns provided in the embodiments of this application;

[0031] Figure 13 This is a schematic diagram of the output power of the conversion circuit provided in the embodiments of this application;

[0032] Figure 14 This is a schematic diagram of the measurement waveform provided in an embodiment of this application;

[0033] Figure 15 A schematic diagram of harmonic current components provided in the embodiments of this application;

[0034] Figure 16 This is a schematic flowchart of a circuit control method provided in one embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0037] It should be understood that the terms “including / comprise” or “have” specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0038] The power supply circuit provided in this application embodiment can be applied to electronic devices. For example, the electronic devices involved in this application embodiment may include, but are not limited to: power adapters, cookie chargers, power banks, mobile phones, laptops, tablets, smartwatches, smart bracelets, robot vacuums, wireless headphones, electric toothbrushes, or desktop computers.

[0039] Typically, the input power of the rectifier bridge circuit in a power supply circuit varies with time, while the input power of the voltage regulator circuit in a power supply circuit is usually relatively constant. Therefore, a PFC circuit is connected in series between the rectifier bridge circuit and the voltage regulator circuit to store and release energy.

[0040] In traditional technologies, the output power of the voltage regulator circuit in a power supply circuit is usually a constant value, which makes the applicable scenarios of power supply circuits in traditional technologies relatively limited and inflexible.

[0041] In the power supply circuit of this application embodiment, the conversion circuit adjusts the output power of the conversion circuit according to the change of the input voltage of the rectifier circuit, so that the output power of the conversion circuit can change with the change of the input voltage of the rectifier circuit, thereby flexibly applying to a variety of scenarios and enriching the applicable scenarios of the power supply circuit of this application embodiment.

[0042] It should be noted that the output power of the conversion circuit involved in the embodiments of this application may vary with the input voltage of the rectifier circuit, including but not limited to: the output power of the conversion circuit may vary accordingly with the input voltage of the rectifier circuit at any time, or the output power of the conversion circuit may vary partially at any time with the input voltage of the rectifier circuit.

[0043] Furthermore, the function of a PFC circuit in traditional technology is to make the power supply circuit (and its load circuit) behave more like a pure resistor relative to the AC power supply. Specifically, it aims to make the input voltage and input current of the power supply circuit (or the output voltage and output current of the rectifier circuit) as out of phase as possible. And minimize the generation of higher harmonics (In). The total harmonic distortion can be represented by the following formula (1), and PF can be represented by the following formula (2).

[0044]

[0045] Where THD represents total harmonic distortion, I n I1 represents the fundamental current, where I represents the nth harmonic current. Of course, the total harmonic distortion can also be expressed by other variations or equivalent formulas of the above formula (1), but this application does not limit this.

[0046]

[0047] Of course, PF can also be expressed by other variations or equivalent formulas of the above formula (2), but this application does not limit this.

[0048] Ideally, the input current of the rectifier circuit in the power supply circuit changes with the input voltage. Figure 1 This is a schematic diagram of the input voltage and input current of an ideal rectifier circuit, such as... Figure 1 As shown, when the input voltage increases, the input current increases accordingly; when the input voltage decreases, the input current decreases accordingly.

[0049] Figure 2 This is a schematic diagram of the input power of a rectifier circuit under ideal conditions, such as... Figure 2 As shown, the waveform of the input power of the rectifier circuit under ideal conditions is a sine wave.

[0050] Figure 3 This is a schematic diagram of the power supply circuit in traditional technology, such as... Figure 3 As shown, the PFC circuit is connected in series between the rectifier circuit and the voltage regulator circuit. The two ends of the capacitor in the PFC circuit are connected in series with the two input terminals of the voltage regulator circuit. Since most of the energy in the power supply circuit needs to pass through the PFC circuit, the energy storage capacity required in the PFC circuit is relatively large. Therefore, the capacitors and inductors in the PFC circuit are relatively large, resulting in a large PFC circuit size, and consequently, a large power supply circuit size.

[0051] In this embodiment, on one hand, by connecting the energy storage circuit in parallel between the rectifier circuit and the voltage regulator circuit, energy flows into the energy storage circuit only when energy storage is detected as needed, and flows out of the energy storage circuit only when energy release is detected. On the other hand, the conversion circuit adjusts its output power according to changes in the input voltage of the rectifier circuit, so that the output power of the conversion circuit can vary with changes in the input voltage (or input power) of the rectifier circuit. Therefore, the energy to be stored or released by the energy storage circuit in this embodiment can be further reduced. In summary, compared with the PFC circuit of the power supply circuit in the conventional technology, the energy storage capacity requirement of the energy storage circuit provided in this embodiment is smaller. Therefore, the volume of the energy storage device in the energy storage circuit is smaller, resulting in a smaller energy storage circuit volume, thereby reducing the volume of the power supply circuit.

[0052] The switching transistors involved in the embodiments of this application may include, but are not limited to, metal-oxide-semiconductor field-effect transistors (MOS transistors) or switching transistors made of gallium nitride (GaN) material, such as metal-semiconductor field-effect transistors (MESFETs), heterojunction field-effect transistors (HFETs), or modulation-doped field-effect transistors (MODFETs).

[0053] For ease of understanding, the following embodiments of this application use NMOS transistors as an example to describe the power supply circuit.

[0054] In one embodiment, Figure 4 This is a schematic diagram of the power supply circuit provided in one embodiment of this application, as shown below. Figure 4 As shown, the power supply circuit in this embodiment may include: a rectifier circuit 40, an energy storage circuit 41, a voltage regulator circuit 42, and a converter circuit 43. The energy storage circuit 41 is connected in parallel with both the rectifier circuit 40 and the voltage regulator circuit 42 (i.e., the energy storage circuit 41 is connected in parallel between the rectifier circuit 40 and the voltage regulator circuit 42), and the converter circuit 43 is connected to both the voltage regulator circuit 42 and the rectifier circuit 40.

[0055] The rectifier circuit 40 in this embodiment is used to convert the input alternating current (AC) into direct current (DC). The energy storage circuit 41 is used to adjust the operating mode according to the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42. The operating mode may include a charging mode, a discharging mode, and a non-operating mode. When the energy storage circuit 41 is in the charging mode, the energy storage device in the energy storage circuit 41 stores energy. When the energy storage circuit 41 is in the discharging mode, the energy storage device in the energy storage circuit 41 releases energy. When the energy storage circuit 41 is in the non-operating mode, the energy storage device in the energy storage circuit 41 neither stores nor releases energy.

[0056] It should be understood that in this embodiment, the energy storage circuit 41 can detect the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42 through the first detection circuit. Exemplarily, the first detection circuit may include, but is not limited to, a voltage sensor, a current sensor, and / or a resistor voltage divider detection circuit.

[0057] In one possible implementation, when the energy storage circuit 41 determines that energy needs to be stored based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, it can adjust its operating mode to a charging mode to allow energy to flow into the energy storage circuit 41 and be stored in the energy storage device within the energy storage circuit 41. Exemplarily, the energy storage device involved in the embodiments of this application may include, but is not limited to, inductors and capacitors.

[0058] In another possible implementation, when the energy storage circuit 41 determines that energy needs to be released based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, it can adjust its operating mode to a discharge mode so that the energy storage device in the energy storage circuit 41 can release energy, that is, energy flows out from the energy storage circuit 41.

[0059] In another possible implementation, the energy storage circuit 41 is used to adjust its operating mode to a non-operating mode when it is determined that neither energy storage nor energy release is required based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, so that neither energy flows in nor out of the energy storage circuit 41.

[0060] As can be seen, in this embodiment of the application, by connecting the energy storage circuit in parallel between the rectifier circuit and the voltage regulator circuit, energy flows into the energy storage circuit only when energy storage is detected and flows out of the energy storage circuit only when energy release is detected. Therefore, compared with the PFC circuit of the power supply circuit in the conventional technology, the energy storage capacity requirement of the energy storage circuit provided in this embodiment of the application is smaller, and thus the size of the energy storage device in the energy storage circuit is smaller.

[0061] The voltage regulator circuit 42 in this embodiment is used to regulate and transform the output voltage of the rectifier circuit 40 according to the operating mode of the energy storage circuit 41. Exemplarily, the voltage regulator circuit 42 in this embodiment may include, but is not limited to, a DC-DC converter with a transformer (DC-DC with transformer, DCX).

[0062] The conversion circuit 43 in this embodiment is used to adjust the output power of the conversion circuit 43 according to the input voltage of the rectifier circuit 40, so that the waveform of the output power of the conversion circuit 43 changes with the waveform of the input voltage (or input power) of the rectifier circuit 40. Exemplarily, the conversion circuit 43 in this embodiment may include, but is not limited to, LVDCDC.

[0063] It should be understood that in this embodiment, the conversion circuit 43 can detect the input voltage of the rectifier circuit 40 through the second detection circuit. Exemplarily, the second detection circuit may include, but is not limited to, a voltage sensor or a resistor divider detection circuit.

[0064] For example, when the input voltage (or input power) of the rectifier circuit 40 increases, the output power of the converter circuit 43 increases accordingly; when the input voltage (or input power) of the rectifier circuit 40 decreases, the output power of the converter circuit 43 decreases accordingly.

[0065] In one possible implementation, in this embodiment of the application, the conversion circuit 43 can adjust the output current of the conversion circuit 43 by adjusting the input current of the conversion circuit 43 according to the input voltage of the rectifier circuit 40, thereby adjusting the output power of the conversion circuit 43.

[0066] In another possible implementation, in this embodiment of the application, the conversion circuit 43 can adjust its output voltage by adjusting the input voltage of the rectifier circuit 40, thereby adjusting the output power of the conversion circuit 43.

[0067] Of course, the output power of the conversion circuit 43 can also be adjusted in other ways, and this application embodiment does not limit this.

[0068] As can be seen, in the power supply circuit of this application embodiment, the output power of the conversion circuit can change with the change of the input voltage of the rectifier circuit, thereby making the power supply circuit flexibly applicable to a variety of scenarios, enriching the applicable scenarios of the power supply circuit of this application embodiment, and by outputting pulsating power, the influence of battery polarization can also be eliminated, which is beneficial to extending battery life.

[0069] In addition, in this embodiment, the output power of the conversion circuit is adjusted according to the change of the input voltage of the rectifier circuit, so that the output power of the conversion circuit can change with the change of the input voltage (or input power) of the rectifier circuit. Therefore, the energy to be stored or released by the energy storage circuit in this embodiment can be further reduced, that is, the energy storage capacity requirement of the energy storage circuit provided in this embodiment is further reduced, thereby the volume of the energy storage device in the energy storage circuit can be further reduced.

[0070] In the aforementioned power supply circuit, on one hand, by connecting the energy storage circuit in parallel between the rectifier circuit and the voltage regulator circuit, and adjusting the operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit, energy flows into the energy storage circuit only when energy storage is needed, and flows out of the energy storage circuit only when energy release is needed. Therefore, only a small portion of the energy in the power supply circuit provided in this application embodiment passes through the energy storage circuit, and the energy storage capacity requirement of the energy storage circuit provided in this application embodiment is smaller compared to the PFC circuit in the conventional technology. On the other hand, by adjusting the output power of the conversion circuit according to the change of the input voltage of the rectifier circuit, the output power of the conversion circuit can change with the change of the input voltage (or input power) of the rectifier circuit. Therefore, the energy storage capacity requirement of the energy storage circuit in this application embodiment is further reduced. In summary, compared with the PFC circuit in the conventional power supply circuit, the energy storage capacity requirement of the energy storage circuit provided in this application embodiment is smaller. Therefore, the volume of the energy storage device in the energy storage circuit is smaller, resulting in a smaller energy storage circuit volume, thereby reducing the volume of the power supply circuit.

[0071] Based on the above embodiments, the following embodiments of this application describe a feasible way for the conversion circuit to adjust the output power of the conversion circuit according to the input voltage of the rectifier circuit.

[0072] In one possible implementation, after obtaining the input voltage of the rectifier circuit 40, the conversion circuit 43 can compare the input voltage of the rectifier circuit 40 with a preset voltage threshold. It should be understood that the conversion circuit 43 can obtain the input voltage of the rectifier circuit 40 through a second detection circuit (such as the detection circuit 44 described below).

[0073] For example, the conversion circuit 43 is used to adjust the output power of the conversion circuit 43 to a first power when the input voltage of the rectifier circuit 40 is greater than a first voltage threshold, or when the input voltage of the rectifier circuit 40 is less than a second voltage threshold. This allows the output power of the conversion circuit 43 to be relatively large when the input voltage of the rectifier circuit 40 is relatively large, wherein the first voltage threshold is greater than the second voltage threshold. For example, the first voltage threshold is 100V, and the second voltage threshold is -100V. It should be noted that the first power in this embodiment can be a value that changes with the input voltage of the rectifier circuit 40, or it can be a power value greater than a first preset power threshold.

[0074] In another exemplary embodiment, the conversion circuit 43 is used to adjust the output power of the conversion circuit 43 to a second power (the second power is less than the first power) when the input voltage of the rectifier circuit 40 is greater than or equal to a second voltage threshold and less than or equal to a first voltage threshold, so that the output power of the conversion circuit 43 is correspondingly smaller when the input voltage of the rectifier circuit 40 is relatively small. It should be noted that the second power in this embodiment can be a value that changes with the input voltage of the rectifier circuit 40, or it can be a power value less than a second preset power threshold, which is less than a first preset power threshold.

[0075] It should be understood that the output voltage of the conversion circuit 43 can be constant. Therefore, the change in the output power of the conversion circuit 43 will be similar to the change in the output current.

[0076] Figure 5 A schematic diagram of the output current of the conversion circuit provided in the embodiments of this application is shown below. Figure 5 As shown, the conversion circuit 43 is used to adjust its output power to a first power when the input voltage of the rectifier circuit 40 is greater than a first voltage threshold, or when the input voltage of the rectifier circuit 40 is less than a second voltage threshold. The first power can be a relatively stable power value greater than a first preset power threshold. The conversion circuit 43 is also used to adjust its output power to a second power when the input voltage of the rectifier circuit 40 is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold. The second power can be 0W.

[0077] In another possible implementation, the input voltage of the rectifier circuit 40 is detected by the second detection circuit, and the input voltage of the rectifier circuit 40 is compared with a preset voltage threshold. Then, a corresponding control signal is sent to the conversion circuit 43 according to the comparison result, thereby adjusting the output power of the conversion circuit 43.

[0078] Figure 6 A schematic diagram of the power supply circuit provided in another embodiment of this application is shown below. Figure 6 As shown, the power supply circuit in this embodiment may further include a detection circuit 44, which is connected to both the rectifier circuit 40 and the converter circuit 43. Exemplarily, one end of the detection circuit 44 is connected to the input terminal of the rectifier circuit 40 to detect the input voltage of the rectifier circuit 40, and the other end of the detection circuit 44 is connected to the control terminal of the converter circuit 43 to send a control signal to the converter circuit 43.

[0079] For example, the control terminal of the conversion circuit 43 involved in the embodiments of this application may include the enable pin of the conversion circuit 43, or the controller corresponding to the conversion circuit 43; of course, it may also include other pins in the conversion circuit 43 that can be used to control the operation of the conversion circuit 43, which is not limited in the embodiments of this application.

[0080] For example, in this embodiment of the application, the detection circuit 44 is used to obtain the input voltage of the rectifier circuit 40, and when the input voltage of the rectifier circuit 40 is greater than a first voltage threshold, or when the input voltage of the rectifier circuit 40 is less than a second voltage threshold, it outputs a first control signal to the conversion circuit 43, so that when the conversion circuit 43 receives the first control signal, it adjusts the output power of the conversion circuit 43 to a first power.

[0081] For example, when the input voltage of the rectifier circuit 40 is greater than the first voltage threshold, or when the input voltage of the rectifier circuit 40 is less than the second voltage threshold, the detection circuit 44 outputs a first control signal to the conversion circuit 43. The first control signal can be a high-level signal "1" so that when the control terminal of the conversion circuit 43 receives the first control signal, it adjusts the output power of the conversion circuit 43 to the first power.

[0082] In another exemplary embodiment, the detection circuit 44 is further configured to output a second control signal to the conversion circuit 43 when the input voltage of the rectifier circuit 40 is greater than or equal to a second voltage threshold and less than or equal to a first voltage threshold, so that the conversion circuit 43 adjusts its output power to a second power when it receives the second control signal.

[0083] For example, when the input voltage of the rectifier circuit 40 is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the detection circuit 44 outputs a second control signal to the conversion circuit 43. The second control signal can be a low-level signal "0" so that when the control terminal of the conversion circuit 43 receives the second control signal, it adjusts the output power of the conversion circuit 43 to the second power.

[0084] In this implementation, the detection circuit 44 compares the input voltage of the rectifier circuit 40 with the first voltage threshold and the second voltage threshold, and sends a corresponding control signal to the conversion circuit 43 based on the comparison result, so as to adjust the output power of the conversion circuit 43. This simplifies the processing logic of the conversion circuit 43.

[0085] Based on the above embodiments, if the circuit on the primary winding side of the voltage regulator circuit 42 and the circuit on the secondary winding side of the voltage regulator circuit 42 are not grounded, then an isolation circuit needs to be provided between the circuit on the primary winding side of the voltage regulator circuit 42 and the circuit on the secondary winding side of the voltage regulator circuit 42. For example... Figure 6 As shown, an isolation circuit 45 can be connected in series between the detection circuit 44 located on the primary winding side of the voltage regulator circuit 42 and the conversion circuit 43 located on the secondary winding side of the voltage regulator circuit 42. The isolation circuit 45 is used to electrically isolate the detection circuit 44 and the conversion circuit 43, thereby improving the safety of the power supply circuit.

[0086] It should be understood that the detection circuit 44 outputs a control signal (such as the first control signal or the second control signal mentioned above) to the conversion circuit 43 through the isolation circuit 45.

[0087] In one embodiment, based on the above embodiments, the implementation of the energy storage circuit 41 is described in this application embodiment.

[0088] Figure 7 A schematic diagram of the power supply circuit provided in another embodiment of this application is shown below. Figure 7 As shown, the energy storage circuit 41 in this embodiment may include a charging / discharging circuit 410 and a control circuit 411. The charging / discharging circuit 410 is connected in parallel with the rectifier circuit 40 and the voltage regulator circuit 42 (i.e., the charging / discharging circuit 410 is connected in parallel between the rectifier circuit 40 and the voltage regulator circuit 42), and the control circuit 411 is connected to the charging / discharging circuit 410.

[0089] The control circuit 411 in this embodiment is used to control the operating mode of the charging and discharging circuit 410 according to the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42. The operating mode may include a charging mode, a discharging mode, and a non-operating mode. In the charging mode, the charging and discharging circuit 410 charges according to the output current of the rectifier circuit, i.e., the energy storage device in the charging and discharging circuit 410 stores energy. In the discharging mode, the charging and discharging circuit 410 discharges to the voltage regulator circuit 42, i.e., the energy storage device in the charging and discharging circuit 410 releases energy. In the non-operating mode, the charging and discharging circuit 410 stops working, i.e., the energy storage device in the charging and discharging circuit 410 is in an open-circuit state.

[0090] It should be understood that in the embodiments of this application, the control circuit 411 can detect the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42 through the first detection circuit.

[0091] For example, the charging and discharging circuit 410 in this application embodiment can be a bidirectional buck circuit (or a BiBuck circuit). When the charging and discharging circuit 410 is in charging mode, it operates in boost mode; when the charging and discharging circuit 410 is in discharging mode, it operates in buck mode.

[0092] In one possible implementation, when the control circuit 411 determines that energy needs to be stored based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, it can control the charging and discharging circuit 410 to be in charging mode so that energy flows into the charging and discharging circuit 410 and is stored in the energy storage device in the charging and discharging circuit 410. Exemplarily, the energy storage device involved in the embodiments of this application may include, but is not limited to, inductors and capacitors.

[0093] For example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in charging mode when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42, that is, when energy needs to be stored.

[0094] As another example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in charging mode when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42, and the difference between the output power and the input power is greater than or equal to a first preset difference, i.e. when energy needs to be stored.

[0095] It should be noted that in the following embodiments of this application, the example is that the control circuit 411 determines that energy needs to be stored when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42.

[0096] In another possible implementation, when the control circuit 411 determines that energy needs to be released based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, it can control the charging and discharging circuit 410 to be in a discharging mode so that the energy storage device in the charging and discharging circuit 410 can release energy, that is, energy flows out from the charging and discharging circuit 410.

[0097] For example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in discharge mode when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, that is, when energy needs to be released.

[0098] As another example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in discharge mode when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, and the difference between the input power and the output power is greater than or equal to a second preset difference, i.e. when energy needs to be released.

[0099] It should be noted that in the following embodiments of this application, the example is that the control circuit 411 determines that energy needs to be released when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42.

[0100] In another possible implementation, the control circuit 411 is used to determine, based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42, that when neither energy storage nor energy release is required, the charging and discharging circuit 410 can be controlled to be in a non-operating mode so that neither energy flows in nor out of the charging and discharging circuit 410.

[0101] For example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in a non-operating mode when the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, that is, when there is no need to store energy or release energy.

[0102] As another example, the control circuit 411 is used to control the charging and discharging circuit 410 to be in a non-working mode when the absolute value of the difference between the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42 is less than a third preset difference, that is, when there is no need to store energy or release energy.

[0103] It should be noted that in the following embodiments of this application, the example given is that when the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, the control circuit 411 determines that it neither needs to store nor release energy.

[0104] In summary, the power supply circuit in this embodiment connects the charging / discharging circuit 410 in parallel between the rectifier circuit 40 and the voltage regulator circuit 42. The control circuit 411 controls the operating mode of the charging / discharging circuit 410 based on the output power of the rectifier circuit 40 and the input power of the voltage regulator circuit 42. This ensures that energy flows into the charging / discharging circuit 410 only when energy storage is needed, and energy flows out of the charging / discharging circuit 410 only when energy release is needed. Therefore, only a small portion of the energy in the power supply circuit provided in this embodiment passes through the charging / discharging circuit 410. Compared to PFC circuits in traditional technologies, the energy storage capacity requirement of the charging / discharging circuit 410 provided in this embodiment is smaller. Consequently, the energy storage devices in the charging / discharging circuit 410 are smaller, resulting in a smaller overall size of the charging / discharging circuit 410 and thus a smaller overall size of the power supply circuit.

[0105] In one embodiment, Figure 8 This is a schematic diagram of a power supply circuit provided in another embodiment of this application. Based on the above embodiments, the relevant content of the charging and discharging circuit 410 is described in this embodiment. Figure 8 As shown, the charging and discharging circuit 410 in this embodiment may include: a selection circuit 210 and an energy storage device 211, wherein the selection circuit 210 is connected to the control circuit 411 and the energy storage device 211 respectively, and the energy storage device 211 is connected in parallel with the rectifier circuit 40 and the voltage regulator circuit 42.

[0106] In one possible implementation, the control circuit 411 is used to control the selection circuit 210 to be in a first conducting state when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42. This allows the selection circuit 210 to charge the energy storage device 211 with the output current of the rectifier circuit 40 in the first conducting state, thereby controlling the charging and discharging circuit 410 to be in a discharging mode.

[0107] For example, the control circuit 411 can control the on / off state of each switch in the selection circuit 210 to make the selection circuit 210 be in the first conducting state, so as to charge the energy storage device 211 according to the output current of the rectifier circuit 40.

[0108] In another possible implementation, the control circuit 411 can control the selection circuit 210 to be in a second conduction state when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, so that the selection circuit 210 can discharge the energy storage device 211 in the second conduction state, thereby controlling the charging and discharging circuit 410 to be in the discharge mode.

[0109] For example, the control circuit 411 can control the energy storage device 211 to discharge by controlling the on / off state of each switch in the selection circuit 210 to put the selection circuit 210 into a second conduction state.

[0110] In another possible implementation, the control circuit 411 can control the selection circuit 210 to be in an open circuit state when the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, thereby causing the energy storage device 211 in the charging and discharging circuit 410 to stop working (neither discharging nor charging), thereby controlling the charging and discharging circuit 410 to be in a non-working mode.

[0111] For example, the control circuit 411 can make the selection circuit 210 open circuit by controlling each switch in the selection circuit 210 to be in the off state.

[0112] In this embodiment, the control circuit 411 controls the on / off state of the selection circuit 210 in the charging / discharging circuit 410 to charge the energy storage device 211 in the charging / discharging circuit 410 when energy storage is needed, or to discharge the energy storage device 211 in the charging / discharging circuit 410 when energy release is needed. This ensures that energy flows into the charging / discharging circuit 410 only when energy storage is needed, and energy flows out of the charging / discharging circuit 410 only when energy release is needed. Therefore, only a small portion of the energy in the power supply circuit provided in this embodiment passes through the charging / discharging circuit 410. The energy storage capacity requirement of the charging / discharging circuit 410 provided in this embodiment is relatively small. Consequently, the volume of the energy storage device 211 in the charging / discharging circuit 410 is small, resulting in a smaller charging / discharging circuit 410 overall, thereby reducing the size of the power supply circuit.

[0113] In one embodiment, Figure 9 This is a schematic diagram of a power supply circuit provided in another embodiment of this application. Based on the above embodiments, the relevant content of the energy storage device 211 is described in this embodiment. Figure 9 As shown, the energy storage device 211 in this embodiment may include an inductor L and a capacitor C1. One end of the inductor L is connected to the rectifier circuit 40, and the other end of the inductor L is connected to the first end of the selection circuit 210. The second end of the selection circuit 210 is connected to 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 control circuit 411 is connected to the fourth end of the selection circuit 210 and is used to control the on / off state of each switch in the selection circuit 210.

[0114] In one possible implementation, the control circuit 411 is used to control the selection circuit 210 to be in a first conducting state when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42. In this first conducting state, the selection circuit 210 can control the rectifier circuit 40 to charge the inductor L until the current of the inductor L reaches a first threshold, and then control the output current of the rectifier circuit 40 to charge the capacitor C1.

[0115] For example, when the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42, the control circuit 411 controls the selection circuit 210 to be in a first conducting state, so that the path between the rectifier circuit 40 and the inductor L is turned on and the path between the inductor L and the capacitor C is turned off, so that the output current of the rectifier circuit 40 charges the inductor L, until the current of the inductor L reaches a first threshold, and then turns on the path between the inductor L and the capacitor C1, so that the output current of the rectifier circuit 40 charges the capacitor C1.

[0116] It should be noted that in this implementation, the control circuit 411 controls the selection circuit 210 to be in a first conducting state, causing the rectifier circuit 40 to charge the inductor L until the current of the inductor L reaches a first threshold. The process of controlling the output current of the rectifier circuit 40 to charge the capacitor C1 is a periodic repetitive process. The first threshold can vary with the output power of the rectifier circuit 40; that is, the first threshold may not be the same in different periods, or in other words, the boost current in this embodiment is dynamically adjustable.

[0117] It should be understood that in this embodiment of the application, the control circuit 411 can detect the current of the inductor L by controlling the detection circuit.

[0118] In another possible implementation, the control circuit 411 is used to control the selection circuit 210 to be in a second conduction state when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42. In this second conduction state, the selection circuit 210 can control the capacitor C1 to discharge until the current of the inductor L reaches a second threshold, at which point the inductor L can be controlled to discharge.

[0119] For example, when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, the control circuit 411 controls the selection circuit 210 to be in a second conduction state, so that the path between the inductor L and the capacitor C1 is turned on, so that the capacitor C1 can discharge, until the current of the inductor L reaches a second threshold, and turns off the path between the inductor L and the capacitor C1, so that the inductor L can discharge.

[0120] It should be noted that in this implementation, the control circuit 411 controls the selection circuit 210 to be in the second conducting state, causing capacitor C1 to discharge until the current of inductor L reaches the second threshold. This process of controlling inductor L to discharge is a periodic repetition process. The second threshold can vary with the output power of the rectifier circuit 40; that is, the second threshold may not be the same in different periods, or in other words, the buck current in this embodiment is dynamically adjustable.

[0121] In another possible implementation, the control circuit 411 can control the selection circuit 210 to be in an open circuit state when the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, thereby disconnecting the path between the rectifier circuit 40 and the inductor L, as well as the path between the capacitor C1 and the inductor L, so that no energy enters the charging and discharging circuit 410.

[0122] It should be noted that in this implementation, the control circuit 411 controls the selection circuit 210 to be in an open circuit state, so that the process of disconnecting the path between the rectifier circuit 40 and the inductor L, and the path between the capacitor C1 and the inductor L is a periodic repetitive process.

[0123] In this embodiment, the control circuit 411 controls the on / off state of the selection circuit 210 in the charging / discharging circuit 410 to charge the inductor L and capacitor C1 in the energy storage device 211 when energy storage is needed, or to discharge the inductor L and capacitor C1 in the energy storage device 211 when energy release is needed. This ensures that energy flows into the energy storage device 211 only when energy storage is needed, and energy flows out of the energy storage device 211 only when energy release is needed. Therefore, only a small portion of the energy in the power supply circuit provided in this embodiment passes through the energy storage device 211. The energy storage capacity requirement of the energy storage device 211 provided in this embodiment is relatively small. Consequently, the capacitor C1 and inductor L in the energy storage device 211 are small, resulting in a smaller charging / discharging circuit 410, thereby reducing the overall size of the power supply circuit.

[0124] In one embodiment, Figure 10 This is a schematic diagram of a power supply circuit provided in another embodiment of this application. Based on the above embodiments, the relevant content of the selection circuit 210 is described in this embodiment. Figure 10 As shown, the selection circuit 210 in this embodiment may include a first switch Q1 and a second switch Q2. The first terminal of the first switch Q1 is connected to the inductor L and the second terminal of the second switch Q2, respectively. The second terminal of the first switch Q1 is connected to the capacitor C1. The first terminal of the second switch Q2 is grounded. The third terminals of the first switch Q1 and the third terminals of the second switch Q2 are both connected to the control circuit 411.

[0125] It should be understood that the control circuit 411 is used to send a first control signal to the first switch Q1 and / or a second control signal to the second switch Q2, wherein the first control signal is used to control the on / off state of the first switch Q1, and the second control signal is used to control the on / off state of the second switch Q2. Exemplarily, the control signals (e.g., the first control signal or the second control signal) involved in the embodiments of this application may include, but are not limited to, pulse width modulation (PWM) signals.

[0126] In one possible implementation, the control circuit 411 is used to control the second switch Q2 to turn on, thereby opening the path between the rectifier circuit 40 and the inductor L, and to control the first switch Q1 to turn off, thereby turning off the path between the inductor L and the capacitor C1, so that the output current of the rectifier circuit 40 can charge the inductor L. When the current of the inductor L reaches a first threshold, the control circuit 411 controls the first switch Q1 to turn on and the second switch Q2 to turn off, thereby opening the path between the inductor L and the capacitor C1, so that the output current of the rectifier circuit 40 can charge the capacitor C1.

[0127] In another possible implementation, the control circuit 411 is used to control the first switch Q1 to turn on and the second switch Q2 to turn off when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, so as to open the path between the inductor L and the capacitor C1, so as to allow the capacitor C1 to discharge. When the current of the inductor reaches the second threshold, the control circuit 411 controls the first switch Q1 to turn off and the second switch Q2 to turn on, so as to open the path between the rectifier circuit 40 and the inductor L and turn off the path between the inductor L and the capacitor C1, so as to allow the inductor L to discharge.

[0128] It should be noted that when the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, the control circuit 411 can first control the first switch Q1 to turn off and the second switch Q2 to turn on, thus opening the path between the rectifier circuit 40 and the inductor L. This continues until the inductor current reaches the third threshold. Then, by controlling the first switch Q1 to turn on and the second switch Q2 to turn off, the path between the inductor L and the capacitor C1 is opened, allowing the capacitor C1 to discharge. Furthermore, when the inductor current reaches the second threshold, the control circuit 411 again controls the first switch Q1 to turn off and the second switch Q2 to turn on, thus opening the path between the rectifier circuit 40 and the inductor L and turning off the path between the inductor L and the capacitor C1, allowing the inductor L to discharge.

[0129] In another possible implementation, the control circuit 411 is used to disconnect the path between the rectifier circuit 40 and the inductor L, and the path between the capacitor C1 and the inductor L, when the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42.

[0130] like Figure 10As shown, the power supply circuit in this embodiment may further include a decoupling circuit 46, wherein the two ends of the decoupling circuit are respectively connected to the two output terminals of the rectifier circuit 40. The decoupling circuit 46 is used to reduce mutual interference between the preceding and following stages of the decoupling circuit 46. The preceding stage of the decoupling circuit 46 may include the rectifier circuit 40, and the following stage of the decoupling circuit 46 may include a voltage regulator circuit 42. Exemplarily, the decoupling circuit 46 may include, but is not limited to, the following: Figure 5 The capacitor C2 shown.

[0131] For ease of understanding, the working process of the energy storage circuit in the power supply circuit is described in the following embodiments of this application.

[0132] 1) Assuming that between time period t1 and t2, when the control circuit 411 detects that the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, it can control the first switch Q1 and the second switch Q2 to be turned off, thereby disconnecting the path between the rectifier circuit 40 and the inductor L, as well as the path between the capacitor C1 and the inductor L, so that the charging and discharging circuit 410 is in a non-working mode.

[0133] 2) Assuming that between time periods t2 and t3, when the control circuit 411 detects that the output power of the rectifier circuit 40 is greater than the input power of the voltage regulator circuit 42, 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 40 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 the 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 40 charges the capacitor C1 through the inductor L (the inductor current I1 flows from left to right). Further, when the current I1 of the inductor decreases from the first threshold to zero, the control circuit 411 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 40 charges the inductor L, and so on, periodically cycling until the output power of the rectifier circuit 40 is no greater than the input power of the voltage regulator circuit 42.

[0134] It should be understood that the first threshold can vary with the output power of the rectifier circuit 40, so that the boost current in this embodiment is dynamically adjustable, so that the waveform of the output current I3 of the rectifier circuit 40 can be further optimized, and the waveform of the output current I3 is closer to the desired waveform (such as a sine wave).

[0135] 3) Assuming that between time period t3 and t4, when the control circuit 411 detects that the output power of the rectifier circuit 40 is equal to the input power of the voltage regulator circuit 42, it can control the first switch Q1 and the second switch Q2 to be turned off, thereby disconnecting the path between the rectifier circuit 40 and the inductor L, as well as the path between the capacitor C1 and the inductor L, so that the charging and discharging circuit 410 is in a non-working mode.

[0136] 4) Assuming that between time periods t4 and t5, when the control circuit 411 detects that the output power of the rectifier circuit 40 is less than the input power of the voltage regulator circuit 42, it controls the first switch Q1 to turn on and the second switch Q2 to turn off, so that capacitor C1 can discharge (the current I2 of the inductor flows from right to left). This continues until the current I2 of the inductor L "increases" from zero to the second threshold. Then, it controls the first switch Q1 to turn off and the second switch Q2 to turn on, so that inductor L can discharge (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 to zero, the control circuit 411 controls the first switch Q1 to turn on and the second switch Q2 to turn off, so that capacitor C1 can discharge, and so on, in a periodic cycle until the output power of the rectifier circuit 40 is not less than the input power of the voltage regulator circuit 42.

[0137] It should be understood that the second threshold can vary with the output power of the rectifier circuit 40, making the buck current in this embodiment dynamically adjustable so as to further optimize the waveform of the output current I3 of the rectifier circuit 40, making the waveform of the output current I3 closer to the desired waveform (such as a sine wave).

[0138] It should be understood that if the inductor current flowing from left to right is considered as a positive current, then the first threshold in the embodiments of this application is a positive integer and the second threshold is a negative integer.

[0139] It should be noted that the working process in the later time periods is similar to that in time periods t1-t5, and will not be described in detail here.

[0140] In summary, in this embodiment, only a small portion of the energy passes through the charging and discharging circuit 410. Compared to the PFC circuit in the conventional technology, the energy storage capacity requirement of the charging and discharging circuit 410 provided in this embodiment is smaller. Therefore, the capacity of the capacitor C1 in the charging and discharging circuit 410 is smaller. Thus, the capacitor C1 in this embodiment can be selected as a high-voltage resistant ceramic capacitor or film capacitor, etc. In addition, by connecting the charging and discharging circuit 410 in parallel, the voltage V1 of the capacitor C1 in this embodiment can vary greatly.

[0141] It should be understood that since the output power of the rectifier circuit 40 changes regularly with the power frequency cycle, and the input power of the voltage regulator circuit 42 is relatively constant, the energy to be stored and released in each half power frequency cycle is a constant ΔW = 1 / 2 * C * (Vmax2 - Vmin2).

[0142] Since the voltage V1 of capacitor C1 in this embodiment can vary greatly, that is, the difference between its highest voltage Vmax and lowest voltage Vmin is large, the capacity of capacitor C1 in this embodiment can be very small compared to the energy storage capacitor in the PFC circuit when the same amount of energy needs to be stored.

[0143] For example, in the embodiments of this application, the voltage V1 of capacitor C1 can fluctuate from 200V to 410V, which is far greater than the fluctuation range of the energy storage capacitor in the traditional PFC circuit (usually within 10V). Therefore, the capacitance of C1 can be greatly reduced.

[0144] In conventional technology, the PFC circuit is connected in series between the rectifier circuit and the voltage regulator circuit, with the inductor in the PFC circuit connected in series between the rectifier circuit and the voltage regulator circuit. Since both the "output power" current and the "stored energy" current in the power supply circuit need to pass through the inductor in the PFC circuit (the "released energy" current flows from the capacitor in the PFC circuit to the voltage regulator circuit), in contrast, in this embodiment, by connecting the charging / discharging circuit 410 in parallel between the rectifier circuit 40 and the voltage regulator circuit 42 in the power supply circuit, the "stored energy" current I1 and the "released energy" current I2 will pass through the inductor L in the charging / discharging circuit 410, but the "output power" current I4 will not pass through the charging / discharging circuit 410. That is, the current flowing through the inductor L is reduced in this embodiment. Therefore, with the same losses, the equivalent series resistance (ESR) of the inductor L in this embodiment can be made larger, thus the size of the inductor L can be made smaller.

[0145] In traditional PFC circuits, the capacitor capacitance is positively correlated with the input power of the voltage regulator circuit. For example, if the input power of the voltage regulator circuit is 100W, the capacitance of the capacitor in the PFC circuit is 100uF; if the input power of the voltage regulator circuit is 80W, the capacitance of the capacitor in the PFC circuit is 80uF. In contrast, with the power supply circuit provided in this application embodiment, the capacitance of capacitor C1 in the charging and discharging circuit can be smaller (e.g., 6uF), and the capacitance of inductor L1 can also be smaller (e.g., 8mm in diameter and 5mm in thickness), thus meeting the 17625-1D class device standard.

[0146] In summary, compared to traditional PFC circuits, the capacitors and inductors in the charging and discharging circuit 410 of this application embodiment can be smaller in size. Therefore, the smaller size of the charging and discharging circuit 410 results in a smaller power supply circuit, thereby providing a better PFC solution for high-power and small-size electronic devices.

[0147] Based on the above embodiments, the following embodiments of this application describe a feasible way for the conversion circuit to adjust the output power of the conversion circuit according to the input voltage of the rectifier circuit.

[0148] Figure 11 This is a schematic diagram of the power supply circuit provided in another embodiment of this application, combined with... Figure 10 and Figure 11 As shown, the energy storage circuit can adjust its operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit. For specific adjustment methods, please refer to the relevant content in the above embodiments of this application, which will not be repeated here.

[0149] For example, the detection circuit detects the input voltage Vac of the rectifier circuit, and when the input voltage Vac of the rectifier circuit is greater than a first voltage threshold, or when the input voltage Vac of the rectifier circuit is less than a second voltage threshold, it sends a first control signal to the isolation circuit so that the isolation circuit outputs the first control signal to the conversion circuit, so that when the conversion circuit receives the first control signal, it adjusts the output power of the conversion circuit to a first power.

[0150] In another example, when the input voltage Vac of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the detection circuit sends a second control signal to the isolation circuit so that the isolation circuit can output the second control signal to the conversion circuit, so that when the conversion circuit receives the second control signal, it adjusts the output power of the conversion circuit to the second power.

[0151] In one possible implementation, in this embodiment of the application, the conversion circuit can adjust the output current I6 of the conversion circuit by adjusting the input current I5 of the conversion circuit according to the received control signal (e.g., the first control signal or the second control signal), thereby adjusting the output power of the conversion circuit.

[0152] In another possible implementation, in this embodiment of the application, the conversion circuit can adjust the output voltage V4 of the conversion circuit by adjusting the input voltage V3 of the conversion circuit according to the received control signal (e.g., the first control signal or the second control signal), thereby adjusting the output power of the conversion circuit.

[0153] Figure 12 This is a schematic diagram of the Vac voltage waveform and the corresponding control signal Csns provided in the embodiments of this application, as shown below. Figure 12 As shown, when the input voltage Vac of the rectifier circuit is greater than the first voltage threshold, or when the input voltage Vac of the rectifier circuit is less than the second voltage threshold, the control signal Csns (i.e., the first control signal) is high; when the input voltage Vac of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the control signal Csns (i.e., the second control signal) is low. It should be understood that... Figure 12 In this context, |Vac| represents the absolute value of the input voltage Vac of the rectifier circuit, and the upper half of the input voltage Vac is covered by |Vac|.

[0154] Figure 13 This is a schematic diagram of the output power of the conversion circuit provided in the embodiments of this application, such as... Figure 13 As shown, in this embodiment, the output power of the conversion circuit can vary with the input voltage (or input power) of the rectifier circuit. For example, when the input voltage of the rectifier circuit is greater than the first voltage threshold, or when the input voltage of the rectifier circuit is less than the second voltage threshold, the output power of the conversion circuit can be the first power P1; when the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the output power of the conversion circuit can be zero.

[0155] It should be understood that the output power of the converter circuit can also vary with the input voltage of the rectifier circuit (approaching a sinusoidal variation).

[0156] In summary, in this embodiment, on the one hand, the charging and discharging circuit is connected in parallel between the rectifier circuit and the voltage regulator circuit, and then the on / off state of the first switch Q1 and the second switch Q2 in the selection circuit is controlled by the control circuit to adjust the operating mode and current magnitude of the charging and discharging circuit. On the other hand, the output power of the conversion circuit is adjusted according to the change in the input voltage of the rectifier circuit, so that the output power of the conversion circuit can change with the change in the input voltage (or input power) of the rectifier circuit. The energy storage capacity requirement of the energy storage circuit in this embodiment can be further reduced, and the volume of the energy storage device in the energy storage circuit can be further reduced, thereby further reducing the volume of the power supply circuit.

[0157] Figure 14 This is a schematic diagram of the measurement waveform provided in an embodiment of this application. Figure 15 A schematic diagram of harmonic current components provided in the embodiments of this application is shown below. Figure 14 The waveform of the output current I3 of the rectifier circuit 40 in the power supply circuit of the embodiment of this application shown can be closer to the desired waveform (such as a sine wave), and as... Figure 15The output current I3 of the rectifier circuit 40 shown has a smaller harmonic current after Fourier transform, which makes it easier to meet the Class 17625-1D equipment standard.

[0158] In one embodiment, Figure 16 This is a flowchart illustrating a circuit control method provided in one embodiment of this application. The circuit control method of this application embodiment can be applied to the power supply circuit provided in the above embodiments of this application. Figure 16 As shown, the method in this application embodiment may include the following steps:

[0159] Step S1601: The rectifier circuit converts the input AC power into DC power.

[0160] Step S1602: The energy storage circuit adjusts its operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit; wherein, the operating mode includes charging mode, discharging mode and non-operating mode.

[0161] Step S1603: The voltage regulator circuit performs voltage regulation and transformation on the output voltage of the rectifier circuit according to the working mode of the energy storage circuit.

[0162] Step S1604: The conversion circuit adjusts the output power of the conversion circuit according to the input voltage of the rectifier circuit.

[0163] In one embodiment, the conversion circuit adjusts the output power of the conversion circuit according to the input voltage of the rectifier circuit, including:

[0164] When the input voltage of the rectifier circuit is greater than the first voltage threshold, or when the input voltage of the rectifier circuit is less than the second voltage threshold, the conversion circuit adjusts the output power of the conversion circuit to the first power.

[0165] In one embodiment, the conversion circuit adjusts the output power of the conversion circuit according to the input voltage of the rectifier circuit, including:

[0166] When the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the output power of the converter circuit is adjusted to the second power, which is less than the first power.

[0167] In one embodiment, the method further includes:

[0168] The detection circuit acquires the input voltage of the rectifier circuit, and outputs a first control signal to the conversion circuit when the input voltage of the rectifier circuit is greater than a first voltage threshold or less than a second voltage threshold.

[0169] Correspondingly, the conversion circuit adjusts its output power according to the input voltage of the rectifier circuit, including:

[0170] When the conversion circuit receives the first control signal, it adjusts the output power of the conversion circuit to the first power.

[0171] In one embodiment, the method further includes:

[0172] When the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the detection circuit outputs a second control signal to the conversion circuit.

[0173] Correspondingly, the conversion circuit adjusts its output power according to the input voltage of the rectifier circuit, including:

[0174] When the conversion circuit receives the second control signal, it adjusts the output power of the conversion circuit to the second power.

[0175] In one embodiment, the energy storage circuit adjusts its operating mode based on the output power of the rectifier circuit and the input power of the voltage regulator circuit, including:

[0176] The control circuit controls the operating mode of the charging and discharging circuit based on the output power of the rectifier circuit and the input power of the voltage regulator circuit; the operating modes include charging mode, discharging mode and non-operating mode.

[0177] The charging and discharging circuit charges the rectifier circuit according to the output current of the rectifier circuit in charging mode, discharges the voltage regulator circuit in discharging mode, and stops working in non-working mode.

[0178] In one embodiment, the control circuit controls the operating mode of the charging and discharging circuit based on the output power of the rectifier circuit and the input power of the voltage regulator circuit, including:

[0179] When the output power is greater than the input power, the control circuit controls the charging and discharging circuit to be in charging mode; or,

[0180] When the output power is less than the input power, the control circuit controls the charging and discharging circuit to be in discharge mode; or,

[0181] When the output power equals the input power, the control circuit controls the charging and discharging circuit to be in a non-operating mode.

[0182] In one embodiment, when the output power is greater than the input power, the control circuit controls the charging and discharging circuit to be in charging mode, including:

[0183] When the output power is greater than the input power, the control selection circuit is in the first conduction state.

[0184] In the first conducting state, the selection circuit enables the output current of the rectifier circuit to charge the energy storage device.

[0185] In one embodiment, the selection circuit, in its first on state, causes the output current of the rectifier circuit to charge the energy storage device, including:

[0186] In the first conducting state, the selection circuit controls the rectifier circuit to charge the inductor until the inductor current reaches the first threshold, and then controls the output current of the rectifier circuit to charge the capacitor.

[0187] In one embodiment, the selection circuit controls the rectifier circuit to charge the inductor in the first on state, and then controls the output current of the rectifier circuit to charge the capacitor when the inductor current reaches a first threshold, including:

[0188] 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.

[0189] In one embodiment, the selection circuit, in a first conducting 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 inductor current reaches a 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:

[0190] When the output power is greater than the input power, the control circuit turns on the second switch and turns off the first switch in the selection circuit, 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 turns on the first switch and turns off the second switch, so that the output current of the rectifier circuit charges the capacitor.

[0191] In one embodiment, when the output power is less than the input power, the control circuit controls the charging and discharging circuit to be in discharge mode, including:

[0192] When the output power is less than the input power, the control selection circuit is in the second conduction state.

[0193] The selection circuit, in the second conduction state, causes the energy storage device to discharge.

[0194] In one embodiment, the selection circuit, in the second on state, causes the energy storage device to discharge, including:

[0195] The selection circuit controls the capacitor to discharge in the second conduction state until the inductor current reaches the second threshold, at which point it controls the inductor to discharge.

[0196] In one embodiment, the selection circuit controls the capacitor to discharge in the second on state until the inductor current reaches a second threshold, and then controls the inductor to discharge, including:

[0197] In the second conduction state, the selection circuit opens the path between the inductor and the capacitor, causing the capacitor to discharge. When the current in the inductor reaches the second threshold, the circuit between the rectifier circuit and the inductor is opened, and the path between the inductor and the capacitor is closed, causing the inductor to discharge.

[0198] In one embodiment, 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 in the inductor reaches a second threshold, at which point the path between the rectifier circuit and the inductor is conducted, and the path between the inductor and the capacitor is turned off, causing the inductor to discharge, including:

[0199] When the output power is less than the input power, the control circuit turns on the first switch and turns off the second switch in the selection circuit to discharge the capacitor. When the current of the inductor reaches the second threshold, the control circuit turns off the first switch and turns on the second switch to discharge the inductor.

[0200] In one embodiment, when the output power equals the input power, the control circuit controls the charging and discharging circuit to be in a non-operating mode, including:

[0201] When the output power equals the input power, the control selection circuit is in an open-circuit state.

[0202] When the selection circuit is in an open-circuit state, it causes the energy storage device to stop working.

[0203] In one embodiment, the selection circuit, when in an open-circuit state, causes the energy storage device to stop operating, including:

[0204] The selection circuit disconnects the path between the rectifier circuit and the inductor, as well as the path between the capacitor and the inductor, when the circuit is open.

[0205] In one embodiment, the selection circuit disconnects the path between the rectifier circuit and the inductor, and the path between the capacitor and the inductor, in an open-circuit state, including:

[0206] When the output power equals the input power, both the first and second switches in the control selection circuit are turned off.

[0207] The circuit control method provided in this application can be applied to the power supply circuit provided in the above-mentioned embodiments of this application. Its implementation principle and technical effect are similar, and will not be described again here.

[0208] In one embodiment, a power supply device is provided, including the power supply circuit provided in the above embodiments of this application. Its implementation principle and technical effects are similar, and will not be described again here.

[0209] In one embodiment, an electronic device is provided, including the power supply device provided in the above embodiments of this application. Its implementation principle and technical effects are similar, and will not be described again here.

[0210] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0211] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a rectifier circuit, an energy storage circuit, a voltage regulator circuit, and a converter circuit; the rectifier circuit, the voltage regulator circuit, and the converter circuit are connected in sequence, and the energy storage circuit is connected in parallel between the rectifier circuit and the voltage regulator circuit; The rectifier circuit is used to convert the input alternating current into direct current. The energy storage circuit is used to adjust the operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit; wherein the operating mode includes a charging mode, a discharging mode and a non-operating mode. The voltage regulator circuit is used to regulate and transform the output voltage of the rectifier circuit according to the operating mode of the energy storage circuit. The conversion circuit is used to adjust the output power of the conversion circuit according to the input voltage of the rectifier circuit.

2. The power supply circuit according to claim 1, characterized in that, The conversion circuit is used to adjust the output power of the conversion circuit to a first power when the input voltage of the rectifier circuit is greater than a first voltage threshold, or when the input voltage of the rectifier circuit is less than a second voltage threshold.

3. The power supply circuit according to claim 2, characterized in that, The conversion circuit is used to adjust the output power of the conversion circuit to a second power, where the second power is less than the first power, when the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold.

4. The power supply circuit according to claim 1, characterized in that, The power supply circuit further includes a detection circuit, which is connected to the rectifier circuit and the converter circuit respectively. The detection circuit is used to acquire the input voltage of the rectifier circuit, and output a first control signal to the conversion circuit when the input voltage of the rectifier circuit is greater than a first voltage threshold or less than a second voltage threshold. The conversion circuit is used to adjust the output power of the conversion circuit to a first power when the first control signal is received.

5. The power supply circuit according to claim 4, characterized in that, The detection circuit is further configured to output a second control signal to the conversion circuit when the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold. The conversion circuit is used to adjust the output power of the conversion circuit to the second power when the second control signal is received.

6. The power supply circuit according to claim 4, characterized in that, The power supply circuit further includes an isolation circuit, which is connected in series between the detection circuit and the conversion circuit. The isolation circuit is used to electrically isolate the detection circuit and the conversion circuit.

7. The power supply circuit according to any one of claims 1-6, characterized in that, The energy storage circuit includes a charging and discharging circuit and a control circuit. The charging and discharging circuit is connected in parallel with the rectifier circuit and the voltage regulator circuit, respectively, and the control circuit is connected to the charging and discharging circuit. The control circuit is used to control the operating mode of the charging and discharging circuit according to the output power of the rectifier circuit and the input power of the voltage regulator circuit; wherein, the operating mode includes charging mode, discharging mode and 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 voltage regulator circuit in the discharging mode, and to stop working in the non-working mode.

8. The power supply circuit according to claim 7, characterized in that, The control circuit is used for: When the output power is greater than the input power, the charging and discharging circuit is controlled to be in charging mode; or, When the output power is less than the input power, the charging and discharging circuit is controlled to be in discharge mode; or, When the output power equals the input power, the charging and discharging circuit is controlled to be in a non-operating mode.

9. The power supply circuit according to claim 8, characterized in that, The charging and discharging circuit includes: a selection circuit and an energy storage device. The selection circuit is connected to the control circuit and the energy storage device respectively. The energy storage device is connected in parallel with the rectifier circuit and the voltage regulator circuit. The control circuit is configured to: control the selection circuit to be in a first conducting state when the output power is greater than the input power; control the selection circuit to be in a second conducting state when the output power is less than the input power; and control the selection circuit to be in an open-circuit state when the output power is equal to the input power. The selection circuit is used to charge the energy storage device with the output current of the rectifier circuit in the first conduction state. In the second on state, the energy storage device is discharged; in the open state, the energy storage device stops working.

10. The power supply circuit according to claim 9, characterized in that, The energy storage device includes an inductor and a capacitor. One end of the inductor is connected to the rectifier circuit, and 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.

11. The power supply circuit according to claim 10, 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.

12. The power supply circuit according to claim 11, 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.

13. The power supply circuit according to claim 7, characterized in that, The power supply circuit further includes a decoupling circuit, the two ends of which are respectively connected to the two output terminals of the rectifier circuit; wherein, the decoupling circuit is used to reduce the mutual interference between the rectifier circuit and the voltage regulator circuit.

14. A circuit control method, characterized in that, The circuit control method is applied to the power supply circuit according to any one of claims 1-13, and the method includes: The rectifier circuit converts the input alternating current (AC) into direct current (DC); The energy storage circuit adjusts its operating mode according to the output power of the rectifier circuit and the input power of the voltage regulator circuit; wherein, the operating mode includes charging mode, discharging mode and non-operating mode; The voltage regulator circuit regulates and transforms the output voltage of the rectifier circuit according to the operating mode of the energy storage circuit. The conversion circuit adjusts its output power based on the input voltage of the rectifier circuit.

15. The method according to claim 14, characterized in that, The conversion circuit adjusts its output power based on the input voltage of the rectifier circuit, including: When the input voltage of the rectifier circuit is greater than a first voltage threshold, or when the input voltage of the rectifier circuit is less than a second voltage threshold, the conversion circuit adjusts the output power of the conversion circuit to a first power.

16. The method according to claim 15, characterized in that, The conversion circuit adjusts its output power based on the input voltage of the rectifier circuit, including: When the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the conversion circuit adjusts the output power of the conversion circuit to a second power, which is less than the first power.

17. The method according to claim 14, characterized in that, The method further includes: The detection circuit acquires the input voltage of the rectifier circuit, and outputs a first control signal to the conversion circuit when the input voltage of the rectifier circuit is greater than a first voltage threshold or less than a second voltage threshold. Correspondingly, the conversion circuit adjusts the output power of the conversion circuit according to the input voltage of the rectifier circuit, including: When the conversion circuit receives the first control signal, it adjusts the output power of the conversion circuit to the first power.

18. The method according to claim 17, characterized in that, The method further includes: When the input voltage of the rectifier circuit is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the detection circuit outputs a second control signal to the conversion circuit. Correspondingly, the conversion circuit adjusts the output power of the conversion circuit according to the input voltage of the rectifier circuit, including: When the conversion circuit receives the second control signal, it adjusts the output power of the conversion circuit to the second power.

19. The method according to any one of claims 14-18, characterized in that, The energy storage circuit adjusts its operating mode based on the output power of the rectifier circuit and the input power of the voltage regulator circuit, including: The control circuit controls the operating mode of the charging and discharging circuit based on the output power of the rectifier circuit and the input power of the voltage regulator circuit; wherein, the operating mode includes charging mode, discharging mode and 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 voltage regulator circuit in the discharging mode, and stops working in the non-working mode.

20. The method according to claim 19, characterized in that, The control circuit controls the operating mode of the charging and discharging circuit based on the output power of the rectifier circuit and the input power of the voltage regulator circuit, including: When the output power is greater than the input power, the control circuit controls the charging and discharging circuit to be in charging mode; or... When the output power is less than the input power, the control circuit controls the charging and discharging circuit to be in discharge mode; or... When the output power equals the input power, the control circuit controls the charging and discharging circuit to be in a non-operating mode.

21. The method according to claim 20, characterized in that, When the output power is greater than the input power, the control circuit 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 controls the selection circuit to be in a first conducting state. When the selection circuit is in the first conducting state, the output current of the rectifier circuit charges the energy storage device.

22. The method according to claim 21, characterized in that, In the first on state, the selection circuit enables the output current of the rectifier circuit to charge the energy storage device, 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.

23. The method according to claim 22, 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.

24. The method according to claim 23, 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.

25. The method according to claim 20, characterized in that, When the output power is less than the input power, the control circuit 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 controls the selection circuit to be in a second conduction state. When the selection circuit is in the second on state, it causes the energy storage device to discharge.

26. The method according to claim 25, characterized in that, When the selection circuit is in the second on state, it causes the energy storage device 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.

27. The method according to claim 26, 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.

28. The method according to claim 27, 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.

29. The method according to claim 20, characterized in that, When the output power equals the input power, the control circuit 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 controls the selection circuit to be in an open circuit state. The selection circuit causes the energy storage device to stop working when the circuit is open.

30. The method according to claim 29, characterized in that, The selection circuit, under the open-circuit state, causes the energy storage device 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.

31. The method according to claim 30, 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.

32. A power supply device, characterized in that, Includes the power supply circuit as described in any one of claims 1-13.

33. An electronic device, characterized in that, Includes the power supply device as described in claim 32.

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