Interleaved pfc circuit and electronic device

Abstract

The utility model relates to a kind of staggered PFC circuit and electronic equipment.The PFC circuit includes: alternating current input unit, input protection unit, PFC control signal output unit, direct current output unit and at least two boost branches;Alternating current input unit is used to provide alternating current input;Boost branch connects alternating current input unit and direct current output unit, carries out boost conversion to alternating current input and provides voltage output by direct current output unit;Input protection unit connects alternating current input unit and direct current output unit, for bypass protection to boost branch;PFC control signal output unit connects all boost branches, for generating and boost branch one-to-one corresponding and mutually staggered control signal, to control boost branch work;Wherein, boost branch includes two PFC boost units, and all PFC boost units in the same boost branch are configured to receive the same control signal.Implementation the utility model can improve the electromagnetic compatibility of power supply circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and more specifically, to an interleaved PFC circuit and electronic device. Background Technology

[0002] Typically, LED driver power supplies require power factor correction circuits. Currently, most commonly used high-power driver power supplies employ CCM continuous control mode power factor correction and interleaved power factor correction, or totem pole bridgeless power factor correction, or single pulse width modulation dual boost semi-bridgeless power factor correction.

[0003] Traditional AC input power factor correction (PFDC) designs typically use bridge rectifiers, and the forward voltage drop of the bridge rectifier is one of the main factors affecting heat dissipation and efficiency. Currently, the most widely used circuit structure is the totem-pole bridgeless PFDC topology. This structure eliminates the bridge rectifier, resulting in an efficiency improvement of approximately 1%-2% compared to PFDC topologies using bridge rectifiers. However, it suffers from complex control, higher cost, and poor electromagnetic compatibility. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an interleaved PFC circuit and electronic device, which addresses the above-mentioned technical defects of the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an interleaved PFC circuit, including: an AC input unit, an input protection unit, a PFC control signal output unit, a DC output unit, and at least two boost branches; The AC input unit is used to provide AC input; The boost branch connects the AC input unit and the DC output unit, and is used to boost the AC input and provide voltage output through the DC output unit; The input protection unit is connected to the AC input unit and the DC output unit, and is used to provide bypass protection for the boost branch. The PFC control signal output unit is connected to all the boost branches and is used to generate control signals that correspond one-to-one with the boost branches and are interleaved with each other, so as to control the operation of the boost branches. The boost branch includes two PFC boost units, and all PFC boost units in the same boost branch are configured to receive the same control signal.

[0006] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the at least two boost branches include a first boost branch and a second boost branch; the control signal includes a first control signal and a second control signal; The first input terminal of the first boost branch and the first input terminal of the second boost branch are connected to the first output terminal of the AC input unit, the second input terminal of the first boost branch and the second input terminal of the second boost branch are connected to the second output terminal of the AC input unit, and the output terminals of the first boost branch and the second boost branch are interconnected and then connected to the input terminal of the DC output unit. The control terminal of the first boost branch is used to receive the first control signal, and the control terminal of the second boost branch is used to receive the second control signal.

[0007] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the first control signal and the second control signal are 180 degrees out of phase.

[0008] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the two PFC boost units include a first PFC boost unit and a second PFC boost unit; The input terminal of the first PFC boost unit is connected to the first output terminal of the AC input unit, the input terminal of the second PFC boost unit is connected to the second output terminal of the AC input unit, the output terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to the input terminal of the DC output unit, and the control terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to a control signal output terminal of the PFC control signal output unit.

[0009] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the first PFC boost unit includes a first inductor, a first switching transistor, and a first boost diode; the first terminal of the first inductor is the input terminal of the first PFC boost unit, the second terminal of the first inductor is connected to the anode of the first boost diode and the first terminal of the first switching transistor, the second terminal of the first switching transistor is grounded, the control terminal of the first switching transistor is the control terminal of the first PFC boost unit, and the cathode of the first boost diode is the output terminal of the first PFC boost unit; and / or The second PFC boost unit includes a second inductor, a second switching transistor, and a second boost diode; the first end of the second inductor is the input terminal of the second PFC boost unit, the second end of the second inductor is connected to the anode of the second boost diode and the first end of the second switching transistor, the second end of the second switching transistor is grounded, the control terminal of the second switching transistor is the control terminal of the second PFC boost unit, and the cathode of the second boost diode is the output terminal of the second PFC boost unit.

[0010] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the input protection unit includes a rectifier bridge, a first filter circuit, and a second filter circuit; The first input terminal of the rectifier bridge is connected to the first terminal of the first filter circuit and the first output terminal of the AC input unit; the second input terminal of the rectifier bridge is connected to the first terminal of the second filter circuit and the second output terminal of the AC input unit. The first output terminal of the rectifier bridge, the second terminal of the first filter circuit, the second output terminal of the rectifier bridge, and the second terminal of the second filter circuit are all grounded.

[0011] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the first filter circuit includes a first filter capacitor, the first end of the first filter capacitor being the first end of the first filter circuit, and the second end of the first filter capacitor being the second end of the first filter circuit; and / or The second filter circuit includes a second filter capacitor, the first end of which is the first end of the second filter circuit, and the second end of which is the second end of the second filter circuit.

[0012] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the PFC control signal output unit includes an interleaved control PFC chip from Texas Instruments' UCC280 series.

[0013] Preferably, in one embodiment of the interleaved PFC circuit of this utility model, the DC output unit includes an electrolytic capacitor and a power conversion circuit; The first end of the electrolytic capacitor is connected to the input end of the power conversion circuit and the output end of the boost branch, the second end of the electrolytic capacitor is grounded, and the output end of the power conversion circuit is used to provide the voltage output.

[0014] In addition, this utility model also provides an electronic device, including the interleaved PFC circuit as described above.

[0015] The interleaved PFC circuit and electronic device of this utility model have the following beneficial effects: they can improve the electromagnetic compatibility performance of the power supply circuit. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a logic block diagram of an embodiment of an interleaved PFC circuit according to the present invention; Figure 2 This is a circuit diagram of an embodiment of an interleaved PFC circuit according to this utility model. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] like Figure 1 The diagram illustrates an embodiment of an interleaved PFC circuit according to the present invention. Figure 1 The illustrated embodiment of an interleaved PFC circuit of the present invention includes: an AC input unit 110, an input protection unit 140, a PFC control signal output unit 150, a DC output unit 130, and at least two boost branches 120; the AC input unit 110 provides AC input; the boost branches 120 connect the AC input unit 110 and the DC output unit 130, and are used to boost the AC input and provide voltage output through the DC output unit 130; The protection unit 140 is connected to the AC input unit 110 and the DC output unit 130, and is used to bypass the boost branch 120 for protection. The PFC control signal output unit 150 is connected to all boost branches 120, and is used to generate control signals that correspond one-to-one with the boost branches 120 and are interleaved to control the operation of the boost branches 120. The boost branch 120 includes two PFC boost units 121, and all PFC boost units 121 in the same boost branch 120 are configured to receive the same control signal.

[0019] Specifically, the AC input unit 110 is used to connect to an external AC input to provide AC input to the PFC circuit. In one embodiment, an EMI filter circuit may be provided in the AC input unit 110 to filter the AC input. There are two or more boost branches 120. All boost branches 120 can be understood as forming a parallel connection, that is, the input terminals of all boost branches 120 are interconnected and then connected to the output terminal of the AC input unit 110, and the output terminals of all boost branches 120 are interconnected and then connected to the input terminal of the DC output unit 130. The boost branches 120 operate according to the received control signals to boost the AC input provided by the AC input unit 110 to obtain a corresponding DC output input to the DC output unit 130, so as to provide the final voltage output through the output terminal of the DC output unit 130. Each boost branch 120 receives a different control signal, meaning that the control signal output by the PFC control signal output unit 150 corresponds one-to-one with the boost branch 120. At the same time, the control signals output by all PFC control signal output units 150 are interleaved. Through the interleaved control signals, each boost branch 120 in the PFC circuit can form a phase difference, and the inductor currents of different branches partially cancel each other out at the output end, thereby reducing the current ripple of the DC bus, increasing the equivalent frequency, and thus improving the electromagnetic compatibility characteristics of the circuit.

[0020] In one embodiment, the control signal output by the PFC control signal output unit 150 is a PWM signal. The PFC control signal output unit 150 can be built using an interleaved control PFC chip commonly used in the industry. For example, in a specific embodiment, an interleaved control PFC chip from Texas Instruments' UCC280 series is used.

[0021] like Figure 2 As shown, in one embodiment, at least two boost branches 120 include a first boost branch and a second boost branch; the control signal includes a first control signal and a second control signal; the first input terminal of the first boost branch and the first input terminal of the second boost branch are connected to the first output terminal of the AC input unit 110, the second input terminal of the first boost branch and the second input terminal of the second boost branch are connected to the second output terminal of the AC input unit 110, and the output terminals of the first boost branch and the second boost branch are interconnected and then connected to the input terminal of the DC output unit 130; the control terminal of the first boost branch is used to receive the first control signal, and the control terminal of the second boost branch is used to receive the second control signal.

[0022] Specifically, during operation, the current flowing through the two boost branches 120 (i.e., the first boost branch and the second boost branch) is equal. Due to the even distribution of current, the current loss that was originally concentrated on a single boost path is effectively dispersed. By interleaving the first control signal and the second control signal, the current ripple at the output terminal is canceled out.

[0023] In one specific embodiment, the first control signal and the second control signal are 180 degrees out of phase. By setting the first and second control signals, the operation processes of the first boost branch and the second boost branch are complementary in time, resulting in current ripples with the same frequency but a 180-degree phase difference between them. This causes the two currents to cancel each other out on the output bus, thereby reducing current ripple. The reduced ripple not only improves the input quality of the DC output unit 130 but also reduces the filter load. Simultaneously, because the current is shared by each branch, device losses are correspondingly reduced, thereby improving the efficiency of the entire PFC circuit.

[0024] When there are multiple boost branches 120, the control signals of each boost branch 120 are phase-shifted (e.g., when there are three boost branches 120, the control signals of the boost branches 120 are phase-shifted by 120°, and when there are four boost branches 120, the control signals of the boost branches 120 are phase-shifted by 90°). This causes the inductor currents in each boost branch 120 to conduct alternately in time. When superimposed on the output bus, the ripple frequency increases and the composite ripple amplitude decreases, thereby effectively suppressing the fluctuation of the output current.

[0025] like Figure 2 As shown, in one embodiment, the two PFC boost units 121 include a first PFC boost unit and a second PFC boost unit; the input terminal of the first PFC boost unit is connected to the first output terminal of the AC input unit 110, the input terminal of the second PFC boost unit is connected to the second output terminal of the AC input unit 110, the output terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to the input terminal of the DC output unit 130, and the control terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to a control signal output terminal of the PFC control signal output unit 150.

[0026] Specifically, each boost branch 120 can be composed of a first PFC boost unit and a second PFC boost unit. The first PFC boost unit is connected to the first output terminal of the AC input unit 110, and is controlled to conduct and boost the input signal during the positive half-cycle of the AC input. The second PFC boost unit is connected to the second output terminal of the AC input unit 110, and is controlled to conduct and boost the input signal during the negative half-cycle of the AC input. Thus, the entire cycle of the AC input can be boosted and output through the corresponding boost unit.

[0027] In one embodiment, the first PFC boost unit includes a first inductor, a first switching transistor, and a first boost diode. The first terminal of the first inductor is the input terminal of the first PFC boost unit, the second terminal of the first inductor is connected to the anode of the first boost diode and the first terminal of the first switching transistor, the second terminal of the first switching transistor is grounded, the control terminal of the first switching transistor is the control terminal of the first PFC boost unit, and the cathode of the first boost diode is the output terminal of the first PFC boost unit. Specifically, in one embodiment, the first inductor may include a power inductor L1, the first boost diode may include a diode D1, and the first switching transistor may include a MOSFET Q1. That is, the operation of the MOSFET Q1 is controlled by the control signal output by the PFC control signal output unit 150 to realize the operation of the PFC boost unit 121. The boost diode is used to release the energy stored in the inductor when the switching transistor is turned off.

[0028] In one embodiment, the second PFC boost unit includes a second inductor, a second switching transistor, and a second boost diode. The first terminal of the second inductor is the input terminal of the second PFC boost unit, the second terminal of the second inductor is connected to the anode of the second boost diode and the first terminal of the second switching transistor, the second terminal of the second switching transistor is grounded, the control terminal of the second switching transistor is the control terminal of the second PFC boost unit, and the cathode of the second boost diode is the output terminal of the second PFC boost unit. Specifically, in one embodiment, the second inductor may include a power inductor L2, the second boost diode may include a diode D2, and the second switching transistor may include a MOSFET Q2. That is, the operation of the MOSFET Q2 is controlled by the control signal output by the PFC control signal output unit 150 to realize the operation of the PFC boost unit 121. The boost diode is used to release the energy stored in the inductor when the switching transistor is turned off.

[0029] By simultaneously turning on or off MOSFETs Q1 and Q2 in the first and second PFC boost units, and simultaneously turning on or off power inductors L1 and L2, energy is stored and released, making the control process of the PFC boost unit 121 simple and highly reliable.

[0030] In one specific embodiment, the first inductor may include a power inductor L3, the first boost diode may include a diode D3, and the first switching transistor may include a MOSFET Q3. That is, the operation of the MOSFET Q3 is controlled by the control signal output by the PFC control signal output unit 150 to realize the operation of the PFC boost unit 121. The second inductor may include a power inductor L4, the second boost diode may include a diode D4, and the second switching transistor may include a MOSFET Q4. That is, the operation of the MOSFET Q4 is controlled by the control signal output by the PFC control signal output unit 150 to realize the operation of the PFC boost unit 121. The boost diode is used to release the energy stored in the inductor when the switching transistor is turned off. By simultaneously turning on or off the MOSFETs Q3 and Q4 in the first and second PFC boost units, the power inductors L3 and L4 are also simultaneously turned on or off, storing and releasing energy simultaneously, making the control process of the PFC boost unit 121 simple and highly reliable.

[0031] In one embodiment, the input protection unit 140 includes a rectifier bridge, a first filter circuit, and a second filter circuit. The first input terminal of the rectifier bridge is connected to the first terminal of the first filter circuit and the first output terminal of the AC input unit 110. The second input terminal of the rectifier bridge is connected to the first terminal of the second filter circuit and the second output terminal of the AC input unit 110. The first output terminal of the rectifier bridge, the second terminal of the first filter circuit, the second output terminal of the rectifier bridge, and the second terminal of the second filter circuit are all grounded. Specifically, the rectifier bridge may include a bridge rectifier BD1, which can serve as a bypass diode for the PFC boost unit 121, providing input to the charging circuit of the DC output unit 130 when the PFC boost unit 121 is not operating, thereby alleviating the saturation of the inductor circuit in the PFC boost unit 121. The first filter circuit and the second filter circuit are used to filter and reduce the switching loop area in the PFC boost unit 121.

[0032] In one embodiment, the first filter circuit includes a first filter capacitor, wherein a first terminal of the first filter capacitor is a first terminal of the first filter circuit, and a second terminal of the first filter capacitor is a second terminal of the first filter circuit. The first filter capacitor may include a thin-film capacitor CBB1.

[0033] In one embodiment, the second filter circuit includes a second filter capacitor, wherein a first terminal of the second filter capacitor is a first terminal of the second filter circuit, and a second terminal of the second filter capacitor is a second terminal of the second filter circuit. The second filter capacitor may include a thin-film capacitor CBB2.

[0034] In one embodiment, the DC output unit 130 includes an electrolytic capacitor and a power conversion circuit 132. The first terminal of the electrolytic capacitor is connected to the input terminal of the power conversion circuit 132 and the output terminal of the boost branch 120, and the second terminal of the electrolytic capacitor is grounded. The output terminal of the power conversion circuit 132 is used to provide voltage output. Specifically, in the DC output unit 130, the electrolytic capacitor CE1 is connected between the output terminal of the boost branch 120 and ground to alleviate the saturation of the inductor in the PFC boost unit 121 through the charging process of the electrolytic capacitor CE1.

[0035] The power conversion circuit 132 can be constructed using commonly used voltage conversion chips and their peripheral resistors, and is used to convert the output of the PFC boost unit 121 into the required voltage to provide voltage output.

[0036] by Figure 2 The following is an example of how the PFC circuit works: When MOSFETs Q1 and Q2 are simultaneously turned on, referring to Table 1, when the voltage at ACL terminal minus the voltage at ACN terminal is greater than 0 (equivalent to the positive half-cycle signal of the corresponding AC input), the current I1 flowing through inductor L1 starts from the ACL terminal, passes through inductor L1 and MOSFET Q1, and after passing through MOSFET Q1, current I1 splits into currents I2 and I3. Current I2 flows through bridge rectifier BD1 to the ACN terminal, and current I3 flows through MOSFET Q2 to inductor L2, and then returns to the ACN terminal. At this time, the main energy storage inductor is inductor L1. When the voltage at ACL terminal minus the voltage at ACN terminal is less than 0 (equivalent to the negative half-cycle signal of the corresponding AC input), the current I4 flowing through inductor L2 starts from the ACN terminal, passes through inductor L2 and MOSFET Q2, and after passing through MOSFET Q2, current I4 splits into currents I5 and I6. Current I5 returns to the ACL terminal through bridge rectifier BD1, and current I6 flows through MOSFET Q1 to inductor L1, and then returns to the ACL terminal. At this point, the main energy storage inductor is inductor L2.

[0037] Table 1 When MOSFETs Q1 and Q2 are simultaneously turned off, referring to Table 2, when the voltage at the ACL terminal minus the voltage at the ACN terminal is greater than 0 (equivalent to the positive half-cycle signal of the corresponding AC input), inductor L1 begins to release energy to generate an induced electromotive force (EMF). According to Lenz's law, the direction of the induced EMF is the direction that sustains the disappearance of the current. At this time, the direction of the induced EMF in inductor L1 is the same as the AC input direction. The voltage on the output bus (corresponding to the input terminal of the DC output unit 130) is higher than the AC input voltage, generating a current I7. After passing through inductor L1, boost diode D1, and charging electrolytic capacitor CE1 and the output power conversion section, it is divided into currents I8 and I9. Current I8 returns to the ACN terminal through bridge rectifier BD1, and current I9 flows through MOSFET Q1 and inductor L2 back to the ACN terminal. When the voltage at the ACL terminal minus the voltage at the ACN terminal is less than 0 (equivalent to the negative half-cycle signal of the corresponding AC input), inductor L2 begins to release energy to generate an induced EMF. According to Lenz's law, the direction of the induced EMF is the direction that sustains the disappearance of the current. At this time, the direction of the induced electromotive force in inductor L2 is the same as the AC input direction, the voltage on the output bus is higher than the AC input voltage, and the current I... 10 After passing through inductor L2, boost diode D2, and the charging and output power conversion section of electrolytic capacitor CE1, the current is divided into I. 11 and current I 12 Current I 11 The current I returns to the ACN terminal via bridge rectifier BD1. 12 The current flows through MOSFET Q1 and inductor L1 back to the ACN terminal.

[0038] Table 2 Within each AC half-cycle, the PWM signal controls the on and off states of MOSFETs Q1 and Q2. During the on-state (corresponding to states 1 and 2 in Table 1), AC source energy is transferred to the main inductor L1 or L2. During the off-state (corresponding to states 3 and 4 in Table 2), the energy storage inductor releases energy to the output and replenishes the load. The four states alternate sequentially in each AC cycle, forming a complete PFC operation loop.

[0039] Based on the idea of ​​current sharing, under ideal conditions, the average current of the two complementary working circuits is halved and the square loss is reduced to 1 / 2 of the original, thereby further reducing conduction loss, inductance loss and rectified voltage drop loss, thus improving the overall efficiency of the machine.

[0040] Furthermore, an electronic device according to this utility model includes an interleaved PFC circuit as described in the above embodiment. By configuring this interleaved PFC circuit, the power supply efficiency of the electronic device can be improved while ensuring the electromagnetic compatibility performance of the load power supply during power supply.

[0041] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An interleaved PFC circuit, characterized in that, include: AC input unit, input protection unit, PFC control signal output unit, DC output unit, and at least two boost branches; The AC input unit is used to provide AC input; The boost branch connects the AC input unit and the DC output unit, and is used to boost the AC input and provide voltage output through the DC output unit; The input protection unit is connected to the AC input unit and the DC output unit, and is used to provide bypass protection for the boost branch. The PFC control signal output unit is connected to all the boost branches and is used to generate control signals that correspond one-to-one with the boost branches and are interleaved with each other, so as to control the operation of the boost branches. Each boost branch includes two PFC boost units, and all PFC boost units in the same boost branch are configured to receive the same control signal.

2. The interleaved PFC circuit of claim 1, wherein, The at least two boost branches include a first boost branch and a second boost branch; the control signal includes a first control signal and a second control signal; The first input terminal of the first boost branch and the first input terminal of the second boost branch are connected to the first output terminal of the AC input unit, the second input terminal of the first boost branch and the second input terminal of the second boost branch are connected to the second output terminal of the AC input unit, and the output terminals of the first boost branch and the second boost branch are interconnected and then connected to the input terminal of the DC output unit. The control terminal of the first boost branch is used to receive the first control signal, and the control terminal of the second boost branch is used to receive the second control signal.

3. The interleaved PFC circuit according to claim 2, characterized in that, The first control signal and the second control signal are 180 degrees out of phase.

4. The interleaved PFC circuit of claim 1, wherein, The two PFC boost units include a first PFC boost unit and a second PFC boost unit; The input terminal of the first PFC boost unit is connected to the first output terminal of the AC input unit, the input terminal of the second PFC boost unit is connected to the second output terminal of the AC input unit, the output terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to the input terminal of the DC output unit, and the control terminals of the first PFC boost unit and the second PFC boost unit are interconnected and then connected to a control signal output terminal of the PFC control signal output unit.

5. The interleaved PFC circuit according to claim 4, characterized in that, The first PFC boost unit includes a first inductor, a first switching transistor, and a first boost diode; the first terminal of the first inductor is the input terminal of the first PFC boost unit, the second terminal of the first inductor is connected to the anode of the first boost diode and the first terminal of the first switching transistor, the second terminal of the first switching transistor is grounded, the control terminal of the first switching transistor is the control terminal of the first PFC boost unit, and the cathode of the first boost diode is the output terminal of the first PFC boost unit; and / or The second PFC boost unit includes a second inductor, a second switching transistor, and a second boost diode; the first end of the second inductor is the input terminal of the second PFC boost unit, the second end of the second inductor is connected to the anode of the second boost diode and the first end of the second switching transistor, the second end of the second switching transistor is grounded, the control terminal of the second switching transistor is the control terminal of the second PFC boost unit, and the cathode of the second boost diode is the output terminal of the second PFC boost unit.

6. The interleaved PFC circuit according to claim 1, characterized in that, The input protection unit includes a rectifier bridge, a first filter circuit, and a second filter circuit. The first input terminal of the rectifier bridge is connected to the first terminal of the first filter circuit and the first output terminal of the AC input unit; the second input terminal of the rectifier bridge is connected to the first terminal of the second filter circuit and the second output terminal of the AC input unit. The first output terminal of the rectifier bridge, the second terminal of the first filter circuit, the second output terminal of the rectifier bridge, and the second terminal of the second filter circuit are all grounded.

7. The interleaved PFC circuit according to claim 6, characterized in that, The first filter circuit includes a first filter capacitor, wherein a first terminal of the first filter capacitor is a first terminal of the first filter circuit, and a second terminal of the first filter capacitor is a second terminal of the first filter circuit; and / or The second filter circuit includes a second filter capacitor, the first end of which is the first end of the second filter circuit, and the second end of which is the second end of the second filter circuit.

8. The interleaved PFC circuit of claim 1, wherein, The PFC control signal output unit includes Texas Instruments' UCC280 series interleaved control PFC chip.

9. The interleaved PFC circuit of claim 1, wherein, The DC output unit includes an electrolytic capacitor and a power conversion circuit. The first end of the electrolytic capacitor is connected to the input end of the power conversion circuit and the output end of the boost branch, the second end of the electrolytic capacitor is grounded, and the output end of the power conversion circuit is used to provide the voltage output.

10. An electronic device, comprising: Includes the interleaved PFC circuit as described in any one of claims 1 to 9.

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