Power factor correction control method, power factor correction circuit and electronic equipment

Abstract

The invention discloses a power factor correction control method, a power factor correction circuit and electronic equipment. The power factor correction circuit comprises a rectifier module, at least two power factor correction modules, an output capacitor and a control module. Wherein each power factor correction module comprises an energy storage element, a first soft switch branch, a second soft switch branch and a switch unit. And the control module is connected with the control end of the switch unit in each path of power factor correction module, and zero-current turn-on is realized by controlling the turn-on time sequence of the switch units. In this way, the situation that the switching unit is large in switching-on loss is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power factor correction, and particularly to a power factor correction control method, a power factor correction circuit, and an electronic device. Background Art

[0002] Currently, power factor correction circuits operate in the CCM mode (continuous conduction mode), DCM mode (discontinuous conduction mode), and CRM mode (critical conduction mode).

[0003] The main loss impacts when a power factor correction circuit operates in the CCM mode include: the turn-on loss of the switching transistor. Summary of the Invention

[0004] The present application provides a power factor correction control method, a power factor correction circuit, and an electronic device, which can enable the switching unit in each power factor correction module to achieve zero-current turn-on, reduce the switching stress borne by the switching unit, and thus solve the problem of large turn-on loss of the switching unit.

[0005] In a first aspect, the present application provides a power factor correction circuit, which includes: a rectification module, the input end of the rectification module is used to connect to a power supply end to receive an input voltage; at least two power factor correction modules, each power factor correction module includes: an energy storage element, the first end of the energy storage element is connected to the first output end of the rectification module; a first soft-switching branch, connected between the second end of the energy storage element and an output node; a second soft-switching branch, connected between the third end of the energy storage element and the output node; a switching unit, the first path end of the switching unit is connected to the second end of the energy storage element, and the second path end of the switching unit is grounded; an output capacitor, the first end of the output capacitor is connected to the output node of each power factor correction module, the second end of the output capacitor is grounded, and the first end and the second end of the output capacitor are used to connect to a load to provide an output voltage; a control module, the control module is connected to the control end of the switching unit in each power factor correction module, and realizes zero-current turn-on by controlling the conduction timing of the switching unit.

[0006] Wherein, the first soft-switching branch includes: a first diode, the positive pole of the first diode is connected to the second end of the energy storage element; a first capacitor, the first end of the first capacitor is connected to the positive pole of the first diode; a first resistor, the first end of the first resistor is connected to the second end of the first capacitor, and the second end of the first resistor is connected to the negative pole of the first diode.

[0007] Wherein, the second soft-switching branch includes: a second diode, the positive pole of the second diode is connected to the third end of the energy storage element; a second capacitor, the first end of the second capacitor is connected to the positive pole of the second diode; a second resistor, the first end of the second resistor is connected to the second end of the second capacitor, and the second end of the second resistor is connected to the negative pole of the second diode.

[0008] Among them, the energy storage element includes: a multi-tap coupled inductor, which includes a main winding, and the first end is connected to the first output end of the rectification module; a first tap, which is connected to the positive pole of the first diode; and a second tap, which is connected to the positive pole of the second diode.

[0009] Among them, the power factor correction circuit further includes: a current sampling unit, which is arranged at the second output end of the rectification module and is connected to the control module for collecting the bus current.

[0010] Among them, the power factor correction circuit includes: a first path power factor correction module and a second path power factor correction module, and the first path power factor correction module and the second path power factor correction module are connected in parallel; the control module is respectively connected to the control ends of the switching units in the first path power factor correction module and the second path power factor correction module.

[0011] Among them, the power factor correction circuit includes: a first path power factor correction module, a second path power factor correction module and a third path power factor correction module, and the first path power factor correction module, the second path power factor correction module and the third path power factor correction module are connected in parallel; the control module is respectively connected to the control ends of the switching units in the first path power factor correction module, the second path power factor correction module and the third path power factor correction module.

[0012] In a second aspect, the present application provides a power factor correction control method, which is applied to the power factor correction circuit provided in the first aspect. The method includes: obtaining an input voltage, an output voltage, a given voltage and a bus current; performing double closed-loop control of a current loop and a voltage loop according to the input voltage, the output voltage, the given voltage and the bus current to obtain a control signal; and outputting the control signal to the control ends of the switching units in each path of the power factor correction module.

[0013] Among them, performing double closed-loop control of a current loop and a voltage loop according to the input voltage, the output voltage, the given voltage and the bus current to obtain a control signal includes: subtracting the output voltage from the given voltage to obtain a voltage error; and performing phase locking on the input voltage to obtain a sine value corresponding to the phase; performing PI regulation on the voltage error, and multiplying the output value of the PI regulation by the sine value to obtain a given current; subtracting the bus current from the given current to obtain a current error; performing PI regulation on the current error to obtain a duty cycle corresponding to the control signal; and outputting a corresponding control signal according to the duty cycle.

[0014] Wherein, when the power factor correction circuit includes a first power factor correction module and a second power factor correction module, the method further includes: outputting a first control signal to a control terminal of a switching unit in the first power factor correction module; and outputting a second control signal to a control terminal of a switching unit in the second power factor correction module; there is a 180-degree phase difference between the first control signal and the second control signal.

[0015] Wherein, when the power factor correction circuit includes a first power factor correction module, a second power factor correction module and a third power factor correction module, the method further includes: outputting a first control signal to a control terminal of a switching unit in the first power factor correction module; and outputting a second control signal to a control terminal of a switching unit in the second power factor correction module; and outputting a third control signal to a control terminal of a switching unit in the third power factor correction module; wherein, there is a 120-degree phase difference between the first control signal and the second control signal, and a 120-degree phase difference between the second control signal and the third control signal.

[0016] In a third aspect, the present application provides an electronic device, including the power factor correction circuit provided in the first aspect.

[0017] The beneficial effects of the present application are: different from the prior art, the power factor correction control method, the power factor correction circuit and the electronic device provided by the present application set at least two power factor correction modules in the power factor correction circuit, and set a first soft-switching branch and a second soft-switching branch in each power factor correction module. By the mutual cooperation of the first soft-switching branch and the second soft-switching branch, the non-recovery operation of the first soft-switching branch is realized, so that the switching unit in each power factor correction module can achieve zero-current turn-on, reduce the switching stress borne by the switching unit, thereby solving the problems of turn-on loss of the switching unit and large loss caused by reverse recovery of the soft-switching branch. Further, the switching units in the two power factor correction modules can conduct alternately under the corresponding phase difference. Therefore, one switching unit can recover when the other switching unit turns on, thereby reducing the switching stress borne by the switching unit. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them: Figure 1 It is a schematic diagram of the mechanism of switching tube turn-on loss and reverse recovery current loss of the recovery diode provided by the present application; Figure 2 It is a schematic structural diagram of an embodiment of the power factor correction circuit provided by this application; Figure 3 It is a control schematic diagram of the control module provided by this application; Figure 4 It is a schematic diagram of the control waveform of the switch unit provided by this application; Figure 5 It is a schematic structural diagram of another embodiment of the power factor correction circuit provided by this application; Figure 6 It is a schematic structural diagram of yet another embodiment of the power factor correction circuit provided by this application; Figure 7 It is a schematic structural diagram of an embodiment of the electronic device provided by this application; Figure 8 It is a schematic flowchart of an embodiment of the power factor correction method provided by this application; Figure 9 is Figure 8 a schematic flowchart of step 82 in Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. It can be understood that the specific embodiments described herein are only used to explain this application, rather than limiting this application. Additionally, it should be noted that for the convenience of description, only parts related to this application rather than all structures are shown in the accompanying drawings. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by this application.

[0020] Referring to "embodiment" herein means that the specific features, structures, or characteristics described in conjunction with the embodiment may be included in at least one embodiment of this application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0021] Currently, the power factor correction circuit operates in the CCM mode (continuous conduction mode), DCM mode (discontinuous conduction mode), and CRM mode (critical conduction mode).

[0022] The main loss impacts when the power factor correction circuit operates in the CCM mode include: the turn-on loss of the switch tube and the reverse recovery current loss of the recovery diode.

[0023] It is found through research that when the power factor correction circuit operates in the CCM mode, the generation mechanisms of the turn-on loss of the switching device and the reverse recovery current loss of the recovery diode are as follows Figure 1 shown. During the switching operation of the switching device, the voltage and current waveforms on the DS pole of the switching device will have an area crossover, and the Ploss power loss problem occurs here. In the hard-switching operating state (especially when the switching frequency is relatively high), the power conversion efficiency is extremely low, the switching loss increases, and the switching stress borne also doubles, which is extremely unfavorable for the high-frequency development of the switching power supply. The energy loss during the turn-on process of the switching device can be obtained through the following integral: .

[0024] Based on this, the present application proposes to additionally provide a second recovery component after the energy storage component in addition to the first recovery component in the power factor correction circuit, and use the diode of the second recovery component to achieve non-recovery operation in the first recovery component, so that the switching unit in the power factor correction circuit can turn on with zero current, reduce the switching stress borne by the switching unit, and thus solve the problems of large turn-on loss of the switching device and large loss caused by reverse recovery of the recovery diode. For specific reference, see the following embodiments.

[0025] See Figure 2 , Figure 2 is a schematic structural diagram of an embodiment of the power factor correction circuit provided by the present application. The power factor correction circuit 100 includes: a rectification module 10, a first path power factor correction module 20, an output capacitor C8, and a control module 30.

[0026] The input end of the rectification module 10 is used to connect to the power supply end to receive the input voltage Vin. In some embodiments, the rectification module 10 includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor C1. Among them, the positive electrode of the diode D1 is connected to the first end of the power supply end, the negative electrode of the diode D2 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D3 is connected to the second end of the power supply end, the negative electrode of the diode D4 is connected to the positive electrode of the diode D3, and the positive electrode of the diode D4 is connected to the positive electrode of the diode D2. The first end of the capacitor C1 is connected to the negative electrode of the diode D3, and the second end of the capacitor C1 is connected to the positive electrode of the diode D4. Among them, the first end of the power supply end can correspond to the L phase, and the second end of the power supply end can correspond to the N phase. Wherein, L represents the live wire and N represents the neutral wire.

[0027] The first path power factor correction module 20 includes: a first energy storage element L1, a first soft-switching branch 21, a second soft-switching branch 22, and a first switching unit Q1. In some embodiments, the first soft-switching branch 21 and / or the second soft-switching branch 22 includes a passive resonant network and / or an active clamp, etc.

[0028] In some embodiments, the first end of the first energy storage element L1 is connected to the first output end of the rectification module 10.

[0029] In some embodiments, the first soft-switching branch 21 is connected between the second end of the first energy storage element L1 and the output node. In some embodiments, the first soft-switching branch 21 includes at least a diode D5 and a first recovery unit. The positive electrode of the diode D5 is connected to the second end of the first energy storage element L1 and the first end of the first recovery unit, and the negative electrode of the diode D5 is connected to the second end of the first recovery unit. In some embodiments, the first recovery unit includes: a capacitor C2 and a resistor R1. The first end of the capacitor C2 is connected to the positive electrode of the diode D5; the first end of the resistor R1 is connected to the second end of the capacitor C2, and the second end of the resistor R1 is connected to the negative electrode of the diode D5.

[0030] The second soft-switching branch 22 is connected between the third end of the first energy storage element L1 and the output node. In some embodiments, the second soft-switching branch 22 includes at least a diode D6 and a second recovery unit. The positive electrode of the diode D6 is connected to the third end of the first energy storage element L1 and the first end of the second recovery unit, and the negative electrode of the diode D6 is connected to the negative electrode of the diode D5 and the second end of the second recovery unit. Wherein, the second recovery unit includes: a capacitor C3 and a resistor R2. The first end of the capacitor C3 is connected to the positive electrode of the diode D6; the first end of the resistor R2 is connected to the second end of the capacitor C3, and the second end of the resistor R2 is connected to the negative electrode of the diode D6.

[0031] In some embodiments, the above-mentioned first energy storage element L1 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap and a second tap. Wherein, the first end of the main winding is connected to the first output end of the rectification module 10; the first tap is connected to the positive electrode of the diode D5; the second tap is connected to the positive electrode of the diode D6. In some embodiments, the coupled inductor can be an autotransformer structure (single winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage transformation.

[0032] The first path end of the first switching unit Q1 is connected to the second end of the first energy storage element L1 (as Figure 2 shown, the first path end of the first switching unit Q1 is connected to the positive electrode of the diode D5), and the second path end of the first switching unit Q1 is grounded. In some embodiments, the switching unit can be composed of a switching tube. The switching tube can be a MOS tube or a triode and other devices with a switching function.

[0033] The first end of the output capacitor C8 is connected to the output node of the first power factor correction module 20. (As Figure 2As shown, the first terminal of the output capacitor C8 is connected to the negative electrode of the diode D5). The second terminal of the output capacitor C8 is grounded. The first and second terminals of the output capacitor C8 are used to connect a load to provide the output voltage Vout.

[0034] The control module 30 is connected to the control terminal of the first switching unit Q1 in the first power factor correction module 20, and is used to achieve zero-current turn-on by controlling the conduction timing of the first switching unit Q1. Further, a resistor R7, a resistor R8, and a diode D11 are also provided between the control module 30 and the first switching unit Q1. Among them, the resistor R7 and the diode D11 are connected in parallel, and the resistor R7 and the resistor R8 are connected in series.

[0035] In some embodiments, the control module 30 is further configured to perform double closed-loop control of a current loop and a voltage loop according to the input voltage Vin, the output voltage Vout, the given voltage Vref, and the bus current I RS and output a control signal to the control terminal of the first switching unit Q1 in the first power factor correction module 20. Exemplarily, it is described in combination with Figure 3 as follows: The control module 30 subtracts the output voltage Vout from the given voltage Vref to obtain a voltage error; and performs PLL phase locking on the input voltage Vin to obtain a phase θ. A corresponding sine value (|Sinθ|) is obtained according to the phase θ. The voltage error is subjected to PI regulation, and the output value of the PI regulation is multiplied by the sine value to obtain a given current Iref; the given current Iref and the bus current I RS are subtracted to obtain a current error; the current error is subjected to PI regulation to obtain the duty ratio corresponding to the control signal; and a corresponding control signal is output according to the duty ratio.

[0036] Further, the power factor correction circuit 100 further includes: a current sampling unit. The current sampling unit is disposed at the second output terminal of the rectification module 10 and is connected to the control module 30 for collecting the bus current I RS . As Figure 2 shown, the current sampling unit may be composed of a resistor RS. The first terminal of the resistor RS is connected to the positive electrode of the diode D4, and the first terminal of the resistor RS is grounded.

[0037] A conventional power factor correction circuit 100 only requires one power semiconductor diode for soft-switching operation. Generally, there is a problem of output power diode recovery in the boost-type single-phase power factor correction circuit 100. It will cause switching losses and EMI / RFI noises related to voltage and current surges. Based on this, the present application proposes that adding a power diode (the second recovery component) in the power factor correction circuit 100 can achieve non-recovery operation of the output power diode. Utilizing the mutual inductance and leakage inductance of the first energy storage element L1, the current through the output power diode can be slowly turned off. The control waveform is as Figure 4 shown. When the switching unit is turned on, compared with Figure 1 , the Ploss power loss has been eliminated.

[0038] In some embodiments, the power factor correction circuit 100 of the present application can be a boost-type power factor correction circuit 100, such as the BOOST type.

[0039] In the present application, in addition to setting the first soft-switching branch 21 in the power factor correction circuit 100, a second soft-switching branch 22 is additionally set after the first energy storage element L1. The diode D6 of the second soft-switching branch 22 is used to achieve non-recovery operation of the diode D5 in the first soft-switching branch 21, so that the first switching unit Q1 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the first switching unit Q1, thereby solving the problems of large switching losses of the switching tube and large losses caused by the reverse recovery of the recovery diode (diode D5).

[0040] Referring to Figure 5 , Figure 5 is a schematic structural diagram of another embodiment of the power factor correction circuit provided by the present application. The power factor correction circuit 100 includes: a rectification module 10, a first path power factor correction module 20, a second path power factor correction module 40, an output capacitor C8, and a control module 30. The first path power factor correction module 20 and the second path power factor correction module 40 are connected in parallel.

[0041] The input terminal of the rectification module 10 is used to connect to the power supply terminal to receive the input voltage Vin. In some embodiments, the rectification module 10 includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor C1. Among them, the positive electrode of the diode D1 is connected to the first end of the power supply terminal, the negative electrode of the diode D2 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D3 is connected to the second end of the power supply terminal, the negative electrode of the diode D4 is connected to the positive electrode of the diode D3, and the positive electrode of the diode D4 is connected to the positive electrode of the diode D2. The first end of the capacitor C1 is connected to the negative electrode of the diode D3, and the second end of the capacitor C1 is connected to the positive electrode of the diode D4. Among them, the first end of the power supply terminal can correspond to the L phase, and the second end of the power supply terminal can correspond to the N phase. Among them, L represents the live wire, and N represents the neutral wire.

[0042] The first power factor correction module 20 includes: a first energy storage element L1, a first soft-switching branch 21, a second soft-switching branch 22, and a first switching unit Q1. In some embodiments, the first soft-switching branch 21 and / or the second soft-switching branch 22 includes a passive resonant network and / or an active clamp, etc.

[0043] The first end of the first energy storage element L1 is connected to the first output terminal of the rectification module 10.

[0044] The first soft-switching branch 21 is connected between the second end of the first energy storage element L1 and the output node. In some embodiments, the first soft-switching branch 21 includes at least a diode D5 and a first recovery unit. The positive electrode of the diode D5 is connected to the second end of the first energy storage element L1 and the first end of the first recovery unit, and the negative electrode of the diode D5 is connected to the second end of the first recovery unit. In some embodiments, the first recovery unit includes: a capacitor C2 and a resistor R1. The first end of the capacitor C2 is connected to the positive electrode of the diode D5; the first end of the resistor R1 is connected to the second end of the capacitor C2, and the second end of the resistor R1 is connected to the negative electrode of the diode D5.

[0045] The second soft-switching branch 22 is connected between the third end of the first energy storage element L1 and the output node. In some embodiments, the second soft-switching branch 22 includes at least a diode D6 and a second recovery unit. The positive electrode of the diode D6 is connected to the third end of the first energy storage element L1 and the first end of the second recovery unit, and the negative electrode of the diode D6 is connected to the negative electrode of the diode D5 and the second end of the second recovery unit. Among them, the second recovery unit includes: a capacitor C3 and a resistor R2. The first end of the capacitor C3 is connected to the positive electrode of the diode D6; the first end of the resistor R2 is connected to the second end of the capacitor C3, and the second end of the resistor R2 is connected to the negative electrode of the diode D6.

[0046] In some embodiments, the above-mentioned first energy storage element L1 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap, and a second tap. Among them, the first end of the main winding is connected to the first output end of the rectification module; the first tap is connected to the positive electrode of the diode D5; the second tap is connected to the positive electrode of the diode D6. In some embodiments, the coupled inductor can be a self-coupled structure (single winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage transformation.

[0047] The first path end of the first switching unit Q1 is connected to the second end of the first energy storage element L1 (as Figure 5 shown, the first path end of the first switching unit Q1 is connected to the positive electrode of the diode D5), and the second path end of the first switching unit Q1 is grounded. In some embodiments, the switching unit can be composed of switching tubes. The switching tubes can be devices with switching functions such as MOS tubes or triodes.

[0048] The second power factor correction module 40 includes: a second energy storage element L2, a third soft-switching branch 41, a fourth soft-switching branch 42, and a second switching unit Q2. In some embodiments, the third soft-switching branch 41 and / or the fourth soft-switching branch 42 includes a passive resonant network and / or an active clamp, etc.

[0049] The first end of the second energy storage element L2 is connected to the first output end of the rectification module 10.

[0050] The third soft-switching branch 41 is connected between the second end of the second energy storage element L2 and the output node. In some embodiments, the third soft-switching branch 41 includes at least a diode D7 and a third recovery unit. The positive electrode of the diode D7 is connected to the second end of the second energy storage element L2 and the first end of the third recovery unit, and the negative electrode of the diode D7 is connected to the second end of the third recovery unit. Among them, the third recovery unit includes: a capacitor C4 and a resistor R3. The first end of the capacitor C4 is connected to the positive electrode of the diode D7; the first end of the resistor R3 is connected to the second end of the capacitor C4, and the second end of the resistor R3 is connected to the negative electrode of the diode D7.

[0051] The fourth soft-switching branch 42 is connected between the third end of the second energy storage element L2 and the output node. In some embodiments, the fourth soft-switching branch 42 includes at least a diode D8 and a fourth recovery unit. The positive electrode of the diode D8 is connected to the third end of the second energy storage element L2 and the first end of the fourth recovery unit, and the negative electrode of the diode D8 is connected to the negative electrode of the diode D7 and the second end of the fourth recovery unit. Among them, the fourth recovery unit includes: a capacitor C5 and a resistor R4. The first end of the capacitor C5 is connected to the positive electrode of the diode D8; the first end of the resistor R4 is connected to the second end of the capacitor C5, and the second end of the resistor R4 is connected to the negative electrode of the diode D8.

[0052] The first path terminal of the second switching unit Q2 is connected to the second end of the second energy storage element L2 (as Figure 5 shown, the first path terminal of the second switching unit Q2 is connected to the positive electrode of the diode D7), and the second path terminal of the second switching unit Q2 is grounded.

[0053] Among them, the second energy storage element L2 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap, and a second tap. Among them, the first end of the main winding is connected to the first output terminal of the rectification module 10; the first tap is connected to the positive electrode of the diode D7; the second tap is connected to the positive electrode of the diode D8. In some embodiments, the coupled inductor can be a self-coupled structure (single winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage transformation.

[0054] The first end of the output capacitor C8 is connected to the negative electrode of the diode D5 of the first power factor correction module 20 and the negative electrode of the diode D7 of the second power factor correction module 40. That is, the first end of the output capacitor C8 is connected to the output node of the first power factor correction module 20 and the output node of the second power factor correction module 40. The second end of the output capacitor C8 is grounded, and the first end and the second end of the output capacitor C8 are used to connect a load to provide the output voltage Vout.

[0055] The control module 30 is respectively connected to the control terminals of the first switching unit Q1 in the first power factor correction module 20 and the second switching unit Q2 in the second power factor correction module 40, and is used to control the first switching unit Q1 and the second switching unit Q2. Further, a resistor R7, a resistor R8, and a diode D11 are also provided between the control module 30 and the first switching unit Q1. Among them, the resistor R7 and the diode D11 are in parallel, and the resistor R7 and the resistor R8 are in series. Further, a resistor R9, a resistor R10, and a diode D12 are also provided between the control module 30 and the second switching unit Q2. Among them, the resistor R9 and the diode D12 are in parallel, and the resistor R9 and the resistor R10 are in series.

[0056] Among them, the control module 30 is also used to perform double closed-loop control of the current loop and the voltage loop according to the input voltage Vin, the output voltage Vout, the given voltage Vref, and the bus current I RS and output a control signal to the control terminals of the first switching unit Q1 in the first power factor correction module 20 and the second switching unit Q2 in the second power factor correction module 40.

[0057] Among them, the control module 30 is further configured to: subtract the output voltage Vout from the given voltage Vref to obtain a voltage error; and perform PLL phase locking on the input voltage Vin to obtain a phase θ. Obtain the corresponding sine value (|Sinθ|) according to the phase θ; perform PI regulation on the voltage error, and multiply the output value of the PI regulation by the sine value to obtain a given current Iref; use the given current Iref and the bus current I RS Subtract to obtain a current error; perform PI regulation on the current error to obtain the duty cycle corresponding to the control signal; output the corresponding control signal according to the duty cycle.

[0058] In some embodiments, the phase difference between the first control signal output by the control module 30 to the first power factor correction module 20 and the second control signal output to the second power factor correction module 40 is 180 degrees.

[0059] Furthermore, the power factor correction circuit 100 further includes: a current sampling unit. The current sampling unit is disposed at the second output end of the rectification module 10 and is connected to the control module 30 for collecting the bus current I RS . As Figure 5 shown, the current sampling unit may be composed of a resistor RS. The first end of the resistor RS is connected to the positive electrode of the diode D4, and the first end of the resistor RS is grounded.

[0060] In the present application, in addition to setting the first soft-switching branch 21 in the first power factor correction module 20, a second soft-switching branch 22 is additionally provided after the first energy storage element L1. The diode D6 of the second soft-switching branch 22 is used to achieve the non-recovery operation of the diode D5 in the first soft-switching branch 21, so that the first switching unit Q1 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the first switching unit Q1, thereby solving the problems of large turn-on loss of the switching tube and large loss caused by the reverse recovery of the recovery diode (diode D5). And, in addition to setting the third soft-switching branch 41 in the second power factor correction module 40, a fourth soft-switching branch 42 is additionally provided after the second energy storage element L2. The diode D8 of the fourth soft-switching branch 42 is used to achieve the non-recovery operation of the diode D7 in the third soft-switching branch 41, so that the second switching unit Q2 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the second switching unit Q2, thereby solving the problems of large turn-on loss of the switching tube and large loss caused by the reverse recovery of the recovery diode (diode D7).

[0061] Furthermore, the switching units in the two power factor correction modules can be alternately turned on under the corresponding phase difference. Therefore, one of the switching units can be recovered when the other switching unit is turned on, thereby reducing the switching stress borne by the switching units.

[0062] Refer to Figure 6 , Figure 6 which is a schematic structural diagram of another embodiment of the power factor correction circuit provided by this application. The power factor correction circuit 100 includes: a rectification module 10, a first power factor correction module 20, a second power factor correction module 40, a third power factor correction module 50, an output capacitor C8, and a control module 30. The first power factor correction module 20, the second power factor correction module 40, and the third power factor correction module 50 are connected in parallel.

[0063] The input end of the rectification module 10 is used to connect to the power supply end to receive the input voltage Vin. In some embodiments, the rectification module 10 includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor C1. Among them, the positive electrode of the diode D1 is connected to the first end of the power supply end, the negative electrode of the diode D2 is connected to the positive electrode of the diode D1, the negative electrode of the diode D3 is connected to the negative electrode of the diode D1, the positive electrode of the diode D3 is connected to the second end of the power supply end, the negative electrode of the diode D4 is connected to the positive electrode of the diode D3, and the positive electrode of the diode D4 is connected to the positive electrode of the diode D2. The first end of the capacitor C1 is connected to the negative electrode of the diode D3, and the second end of the capacitor C1 is connected to the positive electrode of the diode D4. Among them, the first end of the power supply end can correspond to the L phase, and the second end of the power supply end can correspond to the N phase. Wherein, L represents the live wire, and N represents the neutral wire.

[0064] The first power factor correction module 20 includes: a first energy storage element L1, a first soft-switching branch 21, a second soft-switching branch 22, and a first switching unit Q1.

[0065] The first end of the first energy storage element L1 is connected to the first output end of the rectification module 10.

[0066] The first soft-switching branch 21 is connected between the second end of the first energy storage element L1 and the output node. In some embodiments, the first soft-switching branch 21 includes at least a diode D5 and a first recovery unit. The positive electrode of the diode D5 is connected to the second end of the first energy storage element L1 and the first end of the first recovery unit, and the negative electrode of the diode D5 is connected to the second end of the first recovery unit. In some embodiments, the first recovery unit includes: a capacitor C2 and a resistor R1. The first end of the capacitor C2 is connected to the positive electrode of the diode D5; the first end of the resistor R1 is connected to the second end of the capacitor C2, and the second end of the resistor R1 is connected to the negative electrode of the diode D5.

[0067] The second soft-switching branch 22 is connected between the third terminal of the first energy storage element L1 and the output node. In some embodiments, the second soft-switching branch 22 includes at least a diode D6 and a second recovery unit. The positive electrode of the diode D6 is connected to the third terminal of the first energy storage element L1 and the first terminal of the second recovery unit, and the negative electrode of the diode D6 is connected to the negative electrode of the diode D5 and the second terminal of the second recovery unit. Among them, the second recovery unit includes: a capacitor C3 and a resistor R2. The first terminal of the capacitor C3 is connected to the positive electrode of the diode D6; the first terminal of the resistor R2 is connected to the second terminal of the capacitor C3, and the second terminal of the resistor R2 is connected to the negative electrode of the diode D6.

[0068] In some embodiments, the above-mentioned first energy storage element L1 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap, and a second tap. Among them, the first terminal of the main winding is connected to the first output terminal of the rectification module; the first tap is connected to the positive electrode of the diode D5; the second tap is connected to the positive electrode of the diode D6. In some embodiments, the coupled inductor can be an autotransformer structure (single-winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage transformation.

[0069] The first path terminal of the first switching unit Q1 is connected to the second terminal of the first energy storage element L1 (as Figure 6 shown, the first path terminal of the first switching unit Q1 is connected to the positive electrode of the diode D5), and the second path terminal of the first switching unit Q1 is grounded. In some embodiments, the switching unit can be composed of a switching tube. The switching tube can be a MOS tube or a triode and other devices with a switching function.

[0070] The second power factor correction module 40 includes: a second energy storage element L2, a third soft-switching branch 41, a fourth soft-switching branch 42, and a second switching unit Q2.

[0071] The first terminal of the second energy storage element L2 is connected to the first output terminal of the rectification module 10.

[0072] The third soft-switching branch 41 is connected between the second terminal of the second energy storage element L2 and the output node. In some embodiments, the third soft-switching branch 41 includes at least a diode D7 and a third recovery unit. The positive electrode of the diode D7 is connected to the second terminal of the second energy storage element L2 and the first terminal of the third recovery unit, and the negative electrode of the diode D7 is connected to the second terminal of the third recovery unit. Among them, the third recovery unit includes: a capacitor C4 and a resistor R3. The first terminal of the capacitor C4 is connected to the positive electrode of the diode D7; the first terminal of the resistor R3 is connected to the second terminal of the capacitor C4, and the second terminal of the resistor R3 is connected to the negative electrode of the diode D7.

[0073] The fourth soft-switching branch 42 is connected between the third terminal of the second energy storage element L2 and the output node. In some embodiments, the fourth soft-switching branch 42 includes at least a diode D8 and a fourth recovery unit. The positive electrode of the diode D8 is connected to the third terminal of the second energy storage element L2 and the first terminal of the fourth recovery unit, and the negative electrode of the diode D8 is connected to the negative electrode of the diode D7 and the second terminal of the fourth recovery unit. Among them, the fourth recovery unit includes: a capacitor C5 and a resistor R4. The first terminal of the capacitor C5 is connected to the positive electrode of the diode D8; the first terminal of the resistor R4 is connected to the second terminal of the capacitor C5, and the second terminal of the resistor R4 is connected to the negative electrode of the diode D8.

[0074] The first path terminal of the second switching unit Q2 is connected to the second terminal of the second energy storage element L2 (as Figure 6 shown, the first path terminal of the second switching unit Q2 is connected to the positive electrode of the diode D7), and the second path terminal of the second switching unit Q2 is grounded.

[0075] Among them, the second energy storage element L2 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap, and a second tap. Among them, the first terminal of the main winding is connected to the first output terminal of the rectification module 10; the first tap is connected to the positive electrode of the diode D7; the second tap is connected to the positive electrode of the diode D8. In some embodiments, the coupled inductor can be an autotransformer structure (single winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage transformation.

[0076] The third power factor correction module 50 includes: a third energy storage element L3, a fifth soft-switching branch 51, a sixth soft-switching branch 52, and a third switching unit Q3. In some embodiments, the fifth soft-switching branch 51 and / or the sixth soft-switching branch 52 includes a passive resonant network and / or an active clamp, etc.

[0077] The first terminal of the third energy storage element L3 is connected to the first output terminal of the rectification module 10.

[0078] The fifth soft-switching branch 51 is connected between the second terminal of the third energy storage element L3 and the output node. In some embodiments, the fifth soft-switching branch 51 includes at least a diode D9 and a fifth recovery unit. The positive electrode of the diode D9 is connected to the second terminal of the third energy storage element L3 and the first terminal of the fifth recovery unit, and the negative electrode of the diode D9 is connected to the second terminal of the fifth recovery unit. Among them, the fifth recovery unit includes: a capacitor C6 and a resistor R5. The first terminal of the capacitor C6 is connected to the positive electrode of the diode D9; the first terminal of the resistor R5 is connected to the second terminal of the capacitor C6, and the second terminal of the resistor R5 is connected to the negative electrode of the diode D9.

[0079] The sixth soft-switching branch 52 is connected between the third end of the third energy storage element L3 and the output node. In some embodiments, the sixth soft-switching branch 52 includes at least a diode D10 and a sixth recovery unit. The positive electrode of the diode D10 is connected to the third end of the third energy storage element L3 and the first end of the sixth recovery unit, and the negative electrode of the diode D10 is connected to the negative electrode of the diode D9 and the second end of the sixth recovery unit. Among them, the sixth recovery unit includes: a capacitor C7 and a resistor R6. The first end of the capacitor C7 is connected to the positive electrode of the diode D10; the first end of the resistor R6 is connected to the second end of the capacitor C7, and the second end of the resistor R6 is connected to the negative electrode of the diode D10.

[0080] In some embodiments, the third energy storage element L3 includes: a multi-tap coupled inductor. The multi-tap coupled inductor includes a main winding, a first tap, and a second tap. Among them, the first end of the main winding is connected to the first output end of the rectification module 10; the first tap is connected to the positive electrode of the diode D9; the second tap is connected to the positive electrode of the diode D10. In some embodiments, the coupled inductor can be a self-coupled structure (single winding with taps) or a multi-winding magnetic integration structure, and its function is to provide independent energy storage and current distribution for each phase power path, rather than voltage conversion.

[0081] The first conduction end of the third switching unit Q3 is connected to the positive electrode of the diode D9. That is, the first conduction end of the third switching unit Q3 is connected to the second end of the third energy storage element L3. The second conduction end of the third switching unit Q3 is grounded.

[0082] The first end of the output capacitor C8 is connected to the negative electrode of the diode D5 of the first power factor correction module 20, the negative electrode of the diode D7 of the second power factor correction module 40, and the negative electrode of the diode D9 of the third power factor correction module 50. The second end of the output capacitor C8 is grounded. The first end and the second end of the output capacitor C8 are used to connect a load to provide the output voltage Vout.

[0083] The control module 30 is respectively connected to the control terminals of the first switching unit Q1 in the first power factor correction module 20, the second switching unit Q2 in the second power factor correction module 40, and the third switching unit Q3 in the third power factor correction module 50, and is used to achieve zero-current turn-on by controlling the conduction timing of the first switching unit Q1, the second switching unit Q2, and the third switching unit Q3. Further, a resistor R7, a resistor R8, and a diode D11 are also provided between the control module 30 and the first switching unit Q1. Among them, the resistor R7 and the diode D11 are in parallel, and the resistor R7 and the resistor R8 are in series. A resistor R9, a resistor R10, and a diode D12 are also provided between the control module 30 and the second switching unit Q2. Among them, the resistor R9 and the diode D12 are in parallel, and the resistor R9 and the resistor R10 are in series. A resistor R11, a resistor R12, and a diode D13 are also provided between the control module 30 and the third switching unit Q3. Among them, the resistor R11 and the diode D13 are in parallel, and the resistor R11 and the resistor R12 are in series.

[0084] Among them, the control module 30 is also used to perform double closed-loop control of the current loop and the voltage loop according to the input voltage Vin, the output voltage Vout, the given voltage Vref, and the bus current I RS and output a control signal to the control terminals of the first switching unit Q1 in the first power factor correction module 20, the second switching unit Q2 in the second power factor correction module 40, and the third switching unit Q3 in the third power factor correction module 50.

[0085] Among them, the control module 30 is also used to: subtract the output voltage Vout from the given voltage Vref to obtain a voltage error; and perform PLL phase locking on the input voltage Vin to obtain a phase θ. Obtain the corresponding sine value (|Sinθ|) according to the phase θ; perform PI adjustment on the voltage error, and multiply the output value of the PI adjustment by the sine value to obtain a given current Iref; use the given current Iref and the bus current I RS to make a difference to obtain a current error; perform PI adjustment on the current error to obtain the duty cycle corresponding to the control signal; and output the corresponding control signal according to the duty cycle.

[0086] In some embodiments, the phase difference between the first control signal output by the control module 30 to the first power factor correction module 20 and the second control signal output to the second power factor correction module 40 is 120 degrees, and the phase difference between the second control signal output by the control module 30 to the second power factor correction module 40 and the third control signal output to the third power factor correction module 50 is 120 degrees.

[0087] Further, the power factor correction circuit 100 further includes: a current sampling unit. The current sampling unit is disposed at the second output terminal of the rectification module 10 and is connected to the control module 30 for collecting the bus current I RS . As Figure 6 shown, the current sampling unit may be composed of a resistor RS. The first end of the resistor RS is connected to the positive electrode of the diode D4, and the first end of the resistor RS is grounded.

[0088] In the present application, in addition to the first soft-switching branch 21 being provided in the first power factor correction module 20, a second soft-switching branch 22 is additionally provided after the first energy storage element L1. The diode D6 of the second soft-switching branch 22 is used to achieve non-recovery operation of the diode D5 in the first soft-switching branch 21, so that the first switching unit Q1 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the first switching unit Q1, thereby solving the problems of large turn-on loss of the switching tube and large loss caused by reverse recovery of the recovery diode (diode D5). Also, in addition to the third soft-switching branch 41 being provided in the second power factor correction module 40, a fourth soft-switching branch 42 is additionally provided after the second energy storage element L2. The diode D8 of the fourth soft-switching branch 42 is used to achieve non-recovery operation of the diode D7 in the third soft-switching branch 41, so that the second switching unit Q2 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the second switching unit Q2, thereby solving the problems of large turn-on loss of the switching tube and large loss caused by reverse recovery of the recovery diode (diode D7). Also, in addition to the fifth soft-switching branch 51 being provided in the third power factor correction module 50, a sixth soft-switching branch 52 is additionally provided after the third energy storage element L3. The diode D10 of the sixth soft-switching branch 52 is used to achieve non-recovery operation of the diode D9 in the fifth soft-switching branch 51, so that the third switching unit Q3 in the power factor correction circuit 100 can be turned on with zero current, reducing the switching stress borne by the third switching unit Q3, thereby solving the problems of large turn-on loss of the switching tube and large loss caused by reverse recovery of the recovery diode (diode D9). Further, the switching units in the three-way power factor correction module can be alternately turned on with a corresponding phase difference. Therefore, two of the switching units can be recovered when another switching unit is turned on, thereby reducing the switching stress borne by the switching units.

[0089] Referring to Figure 7 , Figure 7 is a schematic structural diagram of an embodiment of an electronic device provided by the present application. The electronic device 200 includes a power factor correction circuit 100. The power factor correction circuit 100 is the power factor correction circuit 100 of any embodiment of the present application. The electronic device 200 may be: any one of a server power supply, an electric vehicle charging module, an industrial frequency converter, etc.

[0090] Refer to Figure 8 , Figure 8 which is a schematic structural diagram of an embodiment of the power factor correction control method provided by this application. It is applied to the power factor correction circuit 100 provided in any of the above embodiments. The method includes: Step 81: Obtain the input voltage, output voltage, given voltage, and bus current.

[0091] Step 82: Perform double closed-loop control of the current loop and voltage loop based on the input voltage, output voltage, given voltage, and bus current to obtain a control signal.

[0092] In some embodiments, refer to Figure 9 , step 82 may be the following process: Step 821: Subtract the output voltage from the given voltage to obtain a voltage error.

[0093] Step 822: Perform phase locking on the input voltage to obtain the sine value corresponding to the phase.

[0094] Step 823: Perform PI regulation on the voltage error, and multiply the output value of the PI regulation by the sine value to obtain a given current.

[0095] Step 824: Subtract the bus current from the given current to obtain a current error.

[0096] Step 825: Perform PI regulation on the current error to obtain the duty cycle corresponding to the control signal.

[0097] Step 826: Output a corresponding control signal according to the duty cycle.

[0098] In some embodiments, steps 821 to 826 can be understood in combination with the description in this application for Figure 3 , and will not be elaborated here.

[0099] Step 83: Output the control signal to the control end of the switching unit in each power factor correction module.

[0100] In some embodiments, when the power factor correction circuit includes a first power factor correction module and a second power factor correction module, output the first control signal to the control end of the switching unit in the first power factor correction module; and output the second control signal to the control end of the switching unit in the second power factor correction module; the phase difference between the first control signal and the second control signal is 180 degrees.

[0101] In some embodiments, when the power factor correction circuit includes a first power factor correction module, a second power factor correction module, and a third power factor correction module, a first control signal is output to the control terminal of the switching unit in the first power factor correction module; and a second control signal is output to the control terminal of the switching unit in the second power factor correction module; and a third control signal is output to the control terminal of the switching unit in the third power factor correction module; wherein, the phase difference between the first control signal and the second control signal is 120 degrees, and the phase difference between the second control signal and the third control signal is 120 degrees.

[0102] In summary, for the power factor correction control method, power factor correction circuit, and electronic device provided in this application, at least two power factor correction modules are provided in the power factor correction circuit, and a first soft-switching branch and a second soft-switching branch are provided in each power factor correction module. By the mutual cooperation of the first soft-switching branch and the second soft-switching branch, the non-recovery operation of the first soft-switching branch is realized, so that the switching unit in each power factor correction module can achieve zero-current turn-on, reducing the switching stress borne by the switching unit, thereby solving the problems of large turn-on loss of the switching unit and large loss caused by the reverse recovery of the soft-switching branch.

[0103] In several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0104] If the integrated unit in the above-mentioned other embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of this application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0105] The above are only the embodiments of the present application, and do not thus limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present application.

Claims

1. A power factor correction circuit, characterized in that, The power factor correction circuit includes: a rectification module, the input end of the rectification module is used to connect to the power supply end to receive an input voltage; at least two power factor correction modules, each power factor correction module includes: a storage element, the first end of the storage element is connected to the first output end of the rectification module; a first soft-switching branch, connected between the second end of the storage element and the output node; a second soft-switching branch, connected between the third end of the storage element and the output node; a switching unit, the first path end of the switching unit is connected to the second end of the storage element, and the second path end of the switching unit is grounded; an output capacitor, the first end of the output capacitor is connected to the output node of each power factor correction module, the second end of the output capacitor is grounded, and the first end and the second end of the output capacitor are used to connect to a load to provide an output voltage; a control module, the control module is connected to the control end of the switching unit in each power factor correction module, and realizes zero-current turn-on by controlling the conduction timing of the switching unit.

2. The power factor correction circuit according to claim 1, characterized in that, The first soft-switching branch includes: a first diode, the positive pole of the first diode is connected to the second end of the storage element; a first capacitor, the first end of the first capacitor is connected to the positive pole of the first diode; a first resistor, the first end of the first resistor is connected to the second end of the first capacitor, and the second end of the first resistor is connected to the negative pole of the first diode.

3. The power factor correction circuit according to claim 1, wherein The second soft-switching branch includes: a second diode, the positive pole of the second diode is connected to the third end of the storage element; a second capacitor, the first end of the second capacitor is connected to the positive pole of the second diode; a second resistor, the first end of the second resistor is connected to the second end of the second capacitor, and the second end of the second resistor is connected to the negative pole of the second diode.

4. The power factor correction circuit according to any one of claims 1-3, characterized in that The storage element includes: a multi-tap coupled inductor, the multi-tap coupled inductor includes a main winding, and the first end is connected to the first output end of the rectification module; a first tap, connected to the positive pole of the first diode in the first soft-switching branch; a second tap, connected to the positive pole of the second diode in the second soft-switching branch.

5. The power factor correction circuit according to any one of claims 1-3, characterized in that, The power factor correction circuit further includes: a current sampling unit, disposed at the second output end of the rectification module and connected to the control module, for collecting the bus current.

6. The power factor correction circuit according to any one of claims 1-3, characterized in that, The power factor correction circuit includes: a first power factor correction module and a second power factor correction module, and the first power factor correction module and the second power factor correction module are connected in parallel; [[ID= 7. The power factor correction circuit according to any one of claims 1-3, characterized in that, ​ The control module is respectively connected to the control ends of the switching units in the first power factor correction module, the second power factor correction module, and the third power factor correction module.

8. A power factor correction control method, characterized in that, Applied to the power factor correction circuit according to any one of claims 1-7, the method includes: Obtain the input voltage, output voltage, given voltage, and bus current; Perform double closed-loop control of the current loop and voltage loop according to the input voltage, output voltage, given voltage, and bus current to obtain a control signal; Output the control signal to the control end of the switching unit in each power factor correction module.

9. The power factor correction control method according to claim 8, characterized in that, The performing double closed-loop control of the current loop and voltage loop according to the input voltage, output voltage, given voltage, and bus current to obtain a control signal includes: Subtract the output voltage from the given voltage to obtain a voltage error; And perform phase locking on the input voltage to obtain a sine value corresponding to the phase; Perform PI adjustment on the voltage error, and multiply the output value of the PI adjustment by the sine value to obtain a given current; Subtract the bus current from the given current to obtain a current error; Perform PI adjustment on the current error to obtain the duty cycle corresponding to the control signal; Output the corresponding control signal according to the duty cycle.

10. The power factor correction control method according to claim 8, characterized in that When the power factor correction circuit includes a first power factor correction module and a second power factor correction module, the method further includes: Output a first control signal to the control end of the switching unit in the first power factor correction module; And output a second control signal to the control end of the switching unit in the second power factor correction module; the phase difference between the first control signal and the second control signal is 180 degrees.

11. The power factor correction control method according to claim 8, wherein When the power factor correction circuit includes a first power factor correction module, a second power factor correction module, and a third power factor correction module, the method further includes: Output a first control signal to the control end of the switching unit in the first power factor correction module; And output a second control signal to the control end of the switching unit in the second power factor correction module; And output a third control signal to the control end of the switching unit in the third power factor correction module; Wherein, the phase difference between the first control signal and the second control signal is 120 degrees, and the phase difference between the second control signal and the third control signal is 120 degrees.

12. An electronic device, characterized in that, Includes the power factor correction circuit according to any one of claims 1-7.

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