PFC totem pole circuit and ZVS implementation method

Abstract

The invention provides a PFC totem-pole circuit and a ZVS realization method, the PFC totem-pole circuit comprises an AC power supply, an inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a current acquisition module, a voltage acquisition module and a capacitor, the third switch tube is a main tube, the fourth switch tube is a follow current tube, or the fourth switch tube is a main tube, and the capacitor is a capacitor. The third switching tube is a follow current tube, the current acquisition module is connected in series with the inductor and the alternating current power supply, the voltage acquisition module is connected in parallel with the inductor, the current acquisition module is used for acquiring an inductance current signal of the inductor, the inductance current signal is used for controlling the follow current tube, and the voltage acquisition module is used for acquiring an inductance voltage signal of the inductor; and the inductance voltage signal is used for controlling the main tube. Therefore, the current signal and the voltage signal of the inductor are acquired, and the main tube and the follow current tube are accurately controlled according to the acquired signals, so that full-range ZVS can be realized, and the switching loss is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a PFC totem pole circuit and a ZVS implementation method. Background Art

[0002] The Power Factor Correction (PFC) totem pole circuit is a circuit that can convert AC power into DC power. Usually, the PFC totem pole circuit includes AC power supply, inductor, capacitor, main tube and freewheeling tube. During the operation of the circuit, the main tube and freewheeling tube can be turned on alternately to convert the input AC power into DC output.

[0003] The traditional bridgeless totem pole PFC circuit has the problem of hard-on of the switch tube and large switching loss. In order to improve efficiency and reduce switching loss, one solution is to implement zero voltage switching (ZVS) of the switch tube. However, the traditional critical current mode PFC control can only achieve valley voltage switching, and cannot completely achieve zero voltage switching. Summary of the invention

[0004] The present application provides a PFC totem pole circuit and a ZVS implementation method, which are used to solve the problem of how to achieve full-range ZVS of a switch tube in a PFC totem pole circuit.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, a PFC totem pole circuit is provided, comprising an AC power supply, an inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a current acquisition module, a voltage acquisition module and a capacitor, wherein:

[0007] One side of the AC power supply is connected to the first end of the first switch tube and the first end of the second switch tube respectively, the other side of the AC power supply is connected to the first end of the third switch tube and the first end of the fourth switch tube respectively through the current acquisition module and the inductor, the second end of the third switch tube is connected to the second end of the first switch tube, the second end of the fourth switch tube is connected to the second end of the second switch tube, the voltage acquisition module is connected in parallel with the inductor, and the capacitor is connected in parallel with the third switch tube and the fourth switch tube;

[0008] The current acquisition module is used to acquire the inductor current signal of the inductor, and the voltage acquisition module is used to acquire the inductor voltage signal of the inductor. The inductor current signal is used to control the freewheeling tube, and the inductor voltage signal is used to control the main tube; wherein, the third switch tube is the main tube, and the fourth switch tube is the freewheeling tube, or, the fourth switch tube is the main tube, and the third switch tube is the freewheeling tube.

[0009] In a second aspect, a ZVS implementation method is provided, which is applied to the PFC totem pole circuit as described in the first aspect, and the method comprises:

[0010] Collecting the inductor current signal of the inductor by the current collection module;

[0011] Collecting the inductor voltage signal of the inductor by the voltage collection module;

[0012] The freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal.

[0013] In a third aspect, an electronic device is provided, including:

[0014] processor;

[0015] a memory for storing instructions executable by the processor;

[0016] The processor is configured to execute the instructions to implement the method as described in the second aspect.

[0017] According to a fourth aspect, a computer-readable storage medium is provided. When instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method described in the second aspect.

[0018] In an embodiment of the present application, a current acquisition module and a voltage acquisition module are added to the PFC totem pole circuit, and the current acquisition module is used to acquire the inductor current signal of the inductor, and the voltage acquisition module is used to acquire the inductor voltage signal of the inductor, and then the freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal. Thus, the main tube and the freewheeling tube can be precisely controlled by the acquired signals, so that full-range ZVS can be achieved while precisely controlling the main tube and the freewheeling tube, thereby effectively reducing switching losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the structure of a PFC totem pole circuit in the prior art;

[0021] Figure 2 is a schematic structural diagram of a PFC totem pole circuit according to an embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of a PFC totem pole circuit according to an embodiment of the present application;

[0023] Figure 4 is a schematic structural diagram of a PFC totem pole circuit according to an embodiment of the present application;

[0024] Figure 5 It is a flowchart of a ZVS implementation method according to an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application;

[0026] Figure 7 It is a structural diagram of a ZVS implementation device according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in this application will be described clearly and completely below in conjunction with the drawings in one or more embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0028] The terms "first", "second", etc. in the present application and claims are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the data used in this way can be interchanged where appropriate so that the present application can be implemented in an order other than those illustrated or described herein. In addition, "and / or" in the present application and claims means at least one of the connected objects, and the character " / " generally means that the objects associated with each other are in an "or" relationship.

[0029] The traditional bridgeless totem pole circuit has the problem of hard-on of the switch tube and large switching loss. Figure 1 shown. Figure 1 Schematic diagram of the structure of the PFC totem pole circuit in the prior art. Figure 1 The totem pole circuit shown includes AC power supply Vac, power frequency return tubes VT1 and VT2, inductor L, main power tubes VT3 and VT4, and BUS capacitor C. In the positive half cycle of AC power supply Vac, VT2 is turned on, VT1 is turned off, VT4 is the main tube, and VT3 is the freewheeling tube. In the negative half cycle of AC power supply Vac, VT1 is turned on, VT2 is turned off, VT3 is the main tube, and VT4 is the freewheeling tube. Among them, whether in the positive half cycle or the negative half cycle of AC power supply, VT3 and VT4 can be controlled to be turned on alternately. In the case of alternating opening, AC power can be converted into DC output.

[0030] In the related art, when controlling VT3 and VT4 to be turned on alternately, there is a problem of hard-on of VT3 and VT4. However, in practical applications, since the operating frequency of the main tube (in the positive half cycle of the AC power supply, the main tube is VT4, and in the negative half cycle of the AC power supply, the main tube is VT3) is usually relatively high (up to several hundred KHz), therefore, in the case of hard opening, it will cause large switching losses of the main tube. In order to reduce the switching losses of the main tube, one solution is to realize full-range ZVS of the main tube, that is, each time the main tube is turned on, zero voltage switching of the main tube can be realized. However, the current control method can usually only realize ZVS of a part of the main tube range, and cannot realize full-range ZVS.

[0031] The embodiment of the present application provides a PFC totem pole circuit and a ZVS implementation method, by adding a current acquisition module and a voltage acquisition module to the PFC totem pole circuit, using the current acquisition module to acquire the inductor current signal of the inductor, using the voltage acquisition module to acquire the inductor voltage signal of the inductor, and then controlling the freewheeling tube according to the inductor current signal, and controlling the main tube according to the inductor voltage signal. Thus, the main tube and the freewheeling tube can be accurately controlled by the acquired signals, so that the full range ZVS of the switch tube can be achieved, and the switching loss can be effectively reduced.

[0032] It should be noted that the ZVS implementation method provided in the embodiment of the present application can achieve full-range ZVS of the main tube. In addition, since the full-range ZVS of the main tube is affected by the freewheeling tube, the embodiment of the present application also controls the freewheeling tube when controlling the main tube, that is, while collecting the inductor voltage signal and controlling the main tube according to the inductor voltage signal, it also collects the inductor current signal and controls the freewheeling tube according to the inductor current signal. Therefore, the main tube and the freewheeling tube can be accurately controlled by the collected signals, so that the full-range ZVS of the main tube can be achieved, and the switching loss can be effectively reduced.

[0033] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0034] Figure 2 It is a schematic diagram of the structure of a PFC totem pole circuit according to an embodiment of the present application. Figure 2 The PFC totem pole circuit shown includes an AC power supply Vac, an inductor L, a first switch tube VT1, a second switch tube VT2, a third switch tube VT3, a fourth switch tube VT4, a current acquisition module, a voltage acquisition module and a capacitor C. The connection relationship of these components is as follows:

[0035] One side of the AC power supply Vac (i.e. Figure 2 The left side of Vac shown in the figure) is respectively connected to the first end of the first switch tube VT1 (i.e. Figure 2 1 end shown) and the first end of the second switch tube VT2 (i.e. Figure 2 The other side of the AC power supply Vac (i.e. Figure 2 The right side of Vac shown in the figure) is connected to the first end of the third switch tube VT3 (i.e. Figure 2 5 terminal shown) and the first terminal of the fourth switch tube VT4 (ie Figure 2 The second end of the third switch tube VT3 (i.e. Figure 2 6 terminal shown) and the second terminal of the first switch tube VT1 (i.e. Figure 2 The second end of the fourth switch tube VT4 (i.e. Figure 2 8 terminal shown) and the second terminal of the second switch tube VT2 (i.e. Figure 2 4 ends as shown in the figure, the voltage acquisition module is connected in parallel with the inductor L, and the capacitor C is connected in parallel with the third switch tube VT3 and the fourth switch tube VT4. The current acquisition module can be used to collect the inductor current signal of the inductor L, and the voltage acquisition module can be used to collect the inductor voltage signal of the inductor L. The inductor current signal can be used to control the freewheeling tube, and the inductor voltage signal can be used to control the main tube. Among them, the third switch tube VT3 is the main tube, and the fourth switch tube VT4 is the freewheeling tube, or the fourth switch tube VT4 is the main tube and the third switch tube VT3 is the freewheeling tube.

[0036] The first switch tube VT1 and the second switch tube VT2 can be power frequency return tubes, and the third switch tube VT3 and the fourth switch tube VT4 are main power tubes. During the operation of the PFC totem pole circuit, the third switch tube VT3 and the fourth switch tube VT4 are turned on alternately. Specifically, in the positive half cycle of the AC power supply Vac, the second switch tube VT2 is turned on, and the first switch tube VT1 is turned off. At this time, the fourth switch tube VT4 is the main switch, and the third switch tube VT3 is the freewheeling tube. The inductor current signal controls the third switch tube VT3, and the inductor voltage signal controls the fourth switch tube VT4, so that the third switch tube VT3 and the fourth switch tube VT4 are turned on alternately. In the negative half cycle of the AC power supply Vac, the first switch tube VT1 is turned on, and the second switch tube VT2 is turned off. At this time, the third switch tube VT3 is the main switch, and the fourth switch tube VT4 is the freewheeling tube. The inductor current signal controls the fourth switch tube VT4, and the inductor voltage signal controls the third switch tube VT3, so that the third switch tube VT3 and the fourth switch tube VT4 are turned on alternately. When the third switch tube VT3 and the fourth switch tube VT4 are turned on alternately, the AC power source Vac can be converted into a DC output, that is, DC power is output across the capacitor C.

[0037] The PFC totem pole circuit provided in the embodiment of the present application adds a current acquisition module and a voltage acquisition module to the PFC totem pole circuit, and uses the current acquisition module to acquire the inductor current signal of the inductor, and uses the voltage acquisition module to acquire the inductor voltage signal of the inductor, and then controls the freewheeling tube according to the inductor current signal, and controls the main tube according to the inductor voltage signal, thereby, the main tube and the freewheeling tube can be precisely controlled by the acquired signals, so that full-range ZVS can be achieved while precisely controlling the main tube and the freewheeling tube, effectively reducing switching losses. Among them, the full-range ZVS here refers to the full-range ZVS of the main tube.

[0038] Optionally, in one implementation, the current acquisition module may include a shunt and a first signal sampling circuit, the shunt is connected in series with the inductor, and the first signal sampling circuit is connected in parallel with the shunt. The shunt may be a resistor, and its resistance value may be set according to actual needs. The first signal sampling circuit may be used to collect the voltage across the shunt, and the voltage may be processed by the first sampling circuit to obtain an inductor current signal, or may be processed by other modules to obtain an inductor current signal. In other possible implementations, the current acquisition module may also be other structures, as long as the collection of the inductor current signal can be realized, and other structures will not be illustrated one by one here.

[0039] Optionally, in one implementation, the voltage acquisition module may include an auxiliary winding and a second signal sampling circuit, the auxiliary winding is coupled to the inductor, and the second signal sampling circuit is connected in parallel to the auxiliary winding. The winding direction of the auxiliary winding may be the same as or different from the winding direction of the inductor, and the auxiliary winding may reflect the voltage condition of the inductor. The second signal sampling circuit may be used to collect two voltages corresponding to the two endpoints of the auxiliary winding, and the two voltages may be processed by the second sampling circuit to obtain an inductor voltage signal, or may be processed by other modules to obtain an inductor voltage signal. In other possible implementations, the voltage acquisition module may also be other structures, as long as the acquisition of the inductor voltage signal can be realized, and other structures will not be illustrated one by one here.

[0040] Optionally, the PFC totem pole circuit provided in the embodiment of the present application may further include a driving module, the input end of the driving module may be connected to the output end of the current acquisition module and the output end of the voltage acquisition module respectively, and the output end of the driving module may be connected to the control end of the third switch tube and the control end of the fourth switch tube respectively. The driving module may be used to control the freewheeling tube according to the inductor current signal, and to control the main tube according to the inductor voltage signal. That is, in the positive half cycle of the AC power supply, the driving module may be used to control the third switch tube as the freewheeling tube according to the inductor current signal, and to control the fourth switch tube as the main tube according to the inductor voltage signal. In the negative half cycle of the AC power supply, the driving module may be used to control the fourth switch tube as the freewheeling tube according to the inductor current signal, and to control the third switch tube as the main tube according to the inductor voltage signal.

[0041] In one implementation, if the signals output by the current acquisition module and the voltage acquisition module are both voltage signals, the driving module may include a processor and a driving circuit. The processor is used to process the voltage signal output by the current acquisition module to obtain an inductor current signal, and to process the voltage signal output by the voltage acquisition module to obtain an inductor voltage signal, and to determine whether to send a driving signal to the driving circuit according to the inductor current signal and the inductor voltage signal, and the driving circuit is used to control the main tube and the freewheeling tube according to the driving signal sent by the processor, for example, to control when the main tube is turned on and when the freewheeling tube is turned off according to the driving signal. In another implementation, if the signal output by the current acquisition module is an inductor current signal, and the signal output by the voltage acquisition module is an inductor voltage signal, the driving module may also include a processor and a driving circuit, the processor is used to receive the inductor current signal and the inductor voltage signal, and to determine whether to send a driving signal to the driving circuit according to the received inductor current signal and the inductor voltage signal, and the driving circuit is used to control the main tube and the freewheeling tube according to the driving signal sent by the processor, for example, to control when the main tube is turned on and when the freewheeling tube is turned off according to the driving signal.

[0042] Figure 3 FIG. 1 is a schematic diagram of a PFC totem pole circuit according to an embodiment of the present application. Figure 3 As shown, the PFC totem pole circuit includes an AC power supply Vac, four switch tubes VT1, VT2, VT3 and VT4, a capacitor C, a resistor R, an inductor L, an auxiliary winding L0, a first signal sampling circuit, a second signal sampling circuit, a processor and a driving circuit. One side of the Vac AC power supply is connected to the midpoint of VT1 and VT2, and the other side is connected to the midpoint of VT3 and VT4 through a resistor R and an inductor L, and the capacitor C is connected in parallel with VT3 and VT4. The first signal sampling circuit is connected in parallel with the resistor R, and the first signal sampling circuit is used to collect the voltage across the resistor R, and output the voltage to the processor, and the processor processes it to obtain the inductor current signal. The auxiliary winding L0 is coupled to the inductor L, and the second signal sampling circuit is connected in parallel with the auxiliary winding L0. The second signal sampling circuit is used to collect two voltages at the two ends of the auxiliary winding, and output the two voltages to the processor, and the processor processes it to obtain the inductor voltage signal. The input end of the drive circuit is connected to the output end of the processor, and the output end of the drive circuit is connected to the control ends of VT3 and VT4 respectively. In the positive half cycle of Vac, the drive circuit is used to control VT3 according to the inductor current signal and to control VT4 according to the inductor voltage signal. In the negative half cycle of Vac, the drive circuit is used to control VT4 according to the inductor current signal and to control VT3 according to the inductor voltage signal.

[0043] Optionally, if Figure 3 The first signal sampling circuit shown can process the collected voltage signal and obtain the inductor current signal, and the second signal sampling circuit can process the collected voltage signal and obtain the inductor voltage signal. Figure 3 The PFC totem pole circuit shown may not include a processor, that is, the output end of the first signal sampling circuit and the output end of the second signal sampling circuit may be directly connected to the input end of the driving circuit.

[0044] In the embodiment of the present application, the above Figure 2 and Figure 3The PFC totem pole circuits shown are all single-phase circuits. In a possible implementation, the PFC totem pole circuit may also be a multi-phase circuit, and each phase circuit may include an inductor, a current acquisition module, a voltage acquisition module, a third switch tube, and a fourth switch tube, and the circuit structure of each phase circuit is the same. The multi-phase PFC totem pole circuit can achieve high power, thereby meeting the demand for high power. Among them, in order to reduce the ripple of the output direct current, there may be a certain phase difference between the drive signals of the multi-phase circuit. Optionally, the phase difference between the drive signal of the Nth phase circuit and the drive signal of the N-1th phase circuit may be 2π / N, and the drive signal includes an inductor current signal and an inductor voltage signal, and N is an integer greater than 1. For example, when N=2, the two phases are interleaved, the circuit structure of the second phase is the same as that of the first phase, and the phase of the drive signal of the second phase circuit lags behind the drive signal of the first phase circuit by 2*π / 2=180°; when N=3, the three phases are interleaved, the phase of the drive signal of the second phase circuit lags behind the drive signal of the first phase circuit by 2*π / 3=120°, the phase of the drive signal of the third phase circuit lags behind the drive signal of the second phase circuit by 2*π / 3=120°, and lags behind the drive signal of the first phase circuit by 2*2*π / N=240°; when N≥4, and so on.

[0045] To understand the multi-phase PFC totem pole circuit, please refer to Figure 4 . Figure 4 It is a schematic diagram of the structure of a PFC totem pole circuit according to an embodiment of the present application. Figure 4 The PFC totem pole circuit shown is a two-phase circuit. The first phase circuit includes a resistor R1, a first signal sampling circuit, an inductor L1, an auxiliary winding L0, a second signal sampling circuit, and switch tubes VT3 and VT4. The second phase circuit includes a resistor R2, a third signal sampling circuit, an inductor L3, an auxiliary winding L2, a fourth signal sampling circuit, switch tubes VT5 and VT6. The processor, the drive circuit, the switch tubes VT1 and VT2, the AC power supply Vac and the capacitor C are common components of the first phase circuit and the second phase circuit. Figure 4 In the embodiment, the phase of the driving signal of the first phase circuit lags behind the phase of the driving signal of the second phase circuit by 180°.

[0046] The PFC totem pole circuit provided in the embodiment of the present application adds a current acquisition module and a voltage acquisition module to the circuit, uses the current acquisition module to acquire the inductor current signal of the inductor, uses the voltage acquisition module to acquire the inductor voltage signal of the inductor, and then controls the freewheeling tube according to the inductor current signal, and controls the main tube according to the inductor voltage signal, so as to achieve precise control of the main tube and the freewheeling tube, thereby achieving full-range ZVS and effectively reducing switching losses. In addition, since each phase circuit can realize the acquisition of the inductor voltage and the inductor current by a set of current acquisition modules and voltage acquisition modules, the circuit components can be reduced and the cost can be saved.

[0047] Based on the PFC totem pole circuit provided in the embodiment of the present application, the embodiment of the present application also provides a ZVS implementation method applied to the PFC totem pole circuit. Based on the ZVS implementation method, a full range of ZVS can be implemented. For details, please refer to Figure 5 .

[0048] Figure 5 It is a flowchart of a ZVS implementation method according to an embodiment of the present application. Figure 5 The ZVS implementation method shown can be applied to Figures 2 to 4 Any of the PFC totem pole circuits shown. Figure 5 The ZVS implementation method shown is described as follows.

[0049] S502: Collecting an inductor current signal of the inductor through a current collection module.

[0050] During the operation of the PFC totem pole circuit, the inductor current signal of the inductor in the circuit can be collected by the current collection module in the circuit.

[0051] In one implementation, the current acquisition module may include a shunt and a first signal sampling circuit, the shunt is connected in series with the inductor, and the first signal sampling circuit is connected in parallel with the shunt. When the inductor current signal of the inductor is collected by the current acquisition module, it may include:

[0052] Collecting a first voltage across the shunt through a first signal sampling circuit;

[0053] The first voltage is processed to obtain an inductor current signal.

[0054] Since the shunt and the inductor are in series, the voltage across the shunt can reflect the current flowing through the inductor from the side. Therefore, the first voltage across the shunt can be collected by the first signal sampling circuit, and then the inductor current signal can be obtained based on the first voltage processing.

[0055] When the first voltage is processed to obtain the inductor current signal, it can be implemented in two ways. The first way is to compare the first voltage with the preset second voltage, and determine the inductor current signal according to the comparison result. The second way is to determine the current signal flowing through the shunt (i.e., the instantaneous value of the current flowing through the inductor) according to the first voltage and the resistance value of the shunt, and determine the current signal as the inductor current signal. In the first mode, the inductor current signal is a PWM signal, which may include a high level signal, a low level signal, a rising edge signal and a falling edge signal, wherein, when the first voltage is greater than the second voltage, the inductor current signal is a high level signal, when the first voltage is less than the second voltage, the inductor current signal is a low level signal, when the low level signal is switched to a high level signal, the inductor current signal is a rising edge signal, indicating that the inductor current is at a time node of a sudden change from a low level where the first voltage is less than the second voltage to a high level where the first voltage is greater than the second voltage, and when the high level signal is switched to a low level signal, the inductor current signal is a falling edge signal, indicating that the inductor current is at a time node of a sudden change from a high level where the first voltage is greater than the second voltage to a low level where the first voltage is less than the second voltage. The second voltage may be set according to actual conditions, as long as it is ensured that when the freewheeling tube is controlled according to the inductor current signal, the full range ZVS opening of the main tube can be achieved, for example, the second voltage may be the voltage across the shunt when the main tube achieves ZVS opening.

[0056] S504: Collecting an inductor voltage signal of the inductor through a voltage collection module.

[0057] During the operation of the PFC totem pole circuit, the inductor voltage signal of the inductor in the circuit can be collected by the voltage collection module in the circuit.

[0058] In one implementation, the voltage acquisition module may include an auxiliary winding and a second signal sampling circuit, the auxiliary winding is coupled to the inductor, and the second signal sampling circuit is connected in parallel with the auxiliary winding. When the inductor voltage signal of the inductor is collected by the voltage acquisition module, it may include:

[0059] Collecting a third voltage and a fourth voltage at two ends of the auxiliary winding by a second signal sampling circuit;

[0060] The third voltage is compared with the fourth voltage, and the inductor voltage signal is determined according to the comparison result.

[0061] Since the auxiliary winding is coupled to the inductor, the voltage at both ends of the auxiliary winding can reflect the voltage at both ends of the inductor from the side, so the voltage at the two ends of the auxiliary winding, i.e., the third voltage and the fourth voltage, can be collected by the second signal sampling circuit, and then the inductor voltage signal can be obtained by comparing the third voltage and the fourth voltage. Among them, the inductor voltage signal can be a PWM signal, when the third voltage is greater than the fourth voltage, the inductor voltage signal is a high-level signal, when the third voltage is less than the fourth voltage, the inductor voltage signal is a low-level signal, when the low-level signal is switched to a high-level signal, the inductor voltage signal is a rising edge signal, indicating the time node when the inductor voltage suddenly changes from a falling state to a rising state, and when the high-level signal is switched to a low-level signal, the inductor voltage signal is a falling edge signal, indicating the time node when the inductor voltage suddenly changes from a rising state to a falling state.

[0062] S506: Control the freewheeling diode according to the inductor current signal, and control the main diode according to the inductor voltage signal.

[0063] After acquiring the inductor voltage signal and the inductor current signal, the freewheeling diode in the circuit can be controlled according to the inductor current signal, and the main diode in the circuit can be controlled according to the inductor voltage signal. Figure 2 and Figure 3 The PFC totem pole circuit shown can control VT3 according to the inductor current signal and VT4 according to the inductor voltage signal in the positive half cycle of the AC power supply Vac, and can control VT4 according to the inductor current signal and VT3 according to the inductor voltage signal in the negative half cycle of the AC power supply Vac.

[0064] In one implementation, controlling the freewheeling tube according to the inductor current signal and controlling the main tube according to the inductor voltage signal may include:

[0065] When the freewheeling tube is turned off, the main tube is controlled to be turned on according to the inductor voltage signal;

[0066] When the main tube is shut down, the freewheeling tube is turned on according to the preset dead time;

[0067] When the freewheeling tube is turned on, the freewheeling tube is controlled to be turned off according to the inductor current signal.

[0068] In an embodiment of the present application, in the initial stage of the positive half cycle and the negative half cycle of the AC power supply, the freewheeling tube and the main tube are both in the default off (i.e., cut-off) state, and thereafter, the freewheeling tube and the main tube can be controlled respectively according to the inductor current signal and the inductor voltage signal to alternately open the main tube and the freewheeling tube. Specifically, taking the positive half cycle of the AC power supply as an example, when both the main tube and the freewheeling tube are turned off, the main tube can be turned on first, and when the main tube is turned on, the main tube can be controlled to be turned on according to the inductor voltage signal. Afterwards, the main tube can be controlled to be turned off, and when the main tube is turned off, the freewheeling tube can be controlled to be turned on, and when the freewheeling tube is turned on, the freewheeling tube can be turned on according to the preset dead time, that is, when the time to turn off the main tube reaches the dead time, the freewheeling tube is controlled to be turned on. After the freewheeling tube is turned on, the freewheeling tube can be turned off, and when the freewheeling tube is turned off, the freewheeling tube can be controlled to be turned off according to the inductor current signal. When the freewheeling tube is turned off, the main tube can be turned on according to the inductor voltage signal, and so on. In the positive half cycle of the AC power supply, the main tube and the freewheeling tube can be turned on alternately by controlling the inductor voltage signal and the inductor current signal. In the negative half cycle of the AC power supply, the opening and closing of the main tube and the freewheeling tube can be controlled in the same way. In this way, since it is possible to accurately control when the main tube is turned on according to the collected inductor voltage signal, and when the freewheeling tube is turned off according to the collected inductor current signal, it is possible to achieve full-range ZVS of the main tube in the positive and negative half cycles of the AC power supply.

[0069] In the above control method, when the main pipe is turned on and off according to the inductor voltage signal, the method may include:

[0070] Determine supervisor opening hours;

[0071] When the start time is reached, the main pipe is shut off.

[0072] When determining the opening time of the main tube, it can be determined according to the circuit parameters of the PFC totem pole circuit. The circuit parameters may include at least one of the input voltage, BUS voltage, inductance and phase-locked loop of the PFC totem pole circuit. When determining the opening time of the main tube according to these circuit parameters, the specific implementation method can refer to the specific implementation in the related art, which will not be described in detail here.

[0073] After the opening time of the main pipe is determined, when the opening time of the main pipe reaches the opening time, the main pipe can be controlled to be turned off.

[0074] As mentioned above, the inductor voltage signal may include a high level signal, a low level signal, a rising edge signal, and a falling edge signal. In the above control method, when controlling the opening of the main tube according to the inductor voltage signal, two control modes may be included. The first control mode is to control the opening of the main tube according to the high level signal and the low level signal in the inductor voltage signal, and the second control mode is to control the opening of the main tube according to the rising edge signal and the falling edge signal in the inductor voltage signal. Which control mode is used to control the opening of the main tube can be determined according to the actual circuit design, and is not specifically limited here.

[0075] In the case of controlling the main tube to be turned on according to the high level signal and the low level signal in the inductor voltage signal, specifically, in the positive half cycle of the AC power supply, when the inductor voltage signal is detected to be a high level signal, the main tube is controlled to be turned on, and in the negative half cycle of the AC power supply, when the inductor voltage signal is detected to be a low level signal, the main tube is controlled to be turned on. Alternatively, in the positive half cycle of the AC power supply, when the inductor voltage signal is detected to be a low level signal, the main tube is controlled to be turned on, and in the negative half cycle of the AC power supply, when the inductor voltage signal is detected to be a high level signal, the main tube is controlled to be turned on. Specifically, it can be determined according to the circuit design of the voltage acquisition module in the PFC totem pole circuit, for example, it can be determined according to whether the winding direction of the auxiliary winding is consistent with the winding direction of the inductor.

[0076] In the case of controlling the main tube to be turned on according to the rising edge signal and the falling edge signal in the inductor voltage signal, specifically, in the positive half cycle of the AC power supply, when the inductor voltage signal is detected as a rising edge signal, the main tube is controlled to be turned on, and in the negative half cycle of the AC power supply, when the inductor voltage signal is detected as a falling edge signal, the main tube is controlled to be turned on. Alternatively, in the positive half cycle of the AC power supply, when the inductor voltage signal is detected as a falling edge signal, the main tube is controlled to be turned on, and in the negative half cycle of the AC power supply, when the inductor voltage signal is detected as a rising edge signal, the main tube is controlled to be turned on. Specifically, it can be determined according to the circuit design of the voltage acquisition module in the PFC totem pole circuit, for example, it can be determined according to whether the winding direction of the auxiliary winding is consistent with the winding direction of the inductor.

[0077] As mentioned above, the inductor current signal may include a high level signal, a low level signal, a rising edge signal and a falling edge signal, or the inductor current signal is a current signal. In the above control method, when controlling the freewheeling tube to be turned off according to the inductor current signal, three control modes may be included. The first control mode is to control the freewheeling tube to be turned off according to the high level signal and the low level signal in the inductor current signal, the second control mode is to control the freewheeling tube to be turned off according to the rising edge signal and the falling edge signal in the inductor current signal, and the third control mode is to control the freewheeling tube to be turned off when the current signal reaches a preset current value. Among them, when the inductor circuit signal includes a high level signal, a low level signal, a rising edge signal and a falling edge signal, whether to use the first control mode or the second control mode to control the main tube to be turned on can be determined according to the actual circuit design, and no specific limitation is made here.

[0078] In the case of controlling the freewheeling tube to turn off according to the high-level signal and the low-level signal in the inductor current signal, specifically, in the positive half cycle of the AC power supply, when the inductor current signal is detected as a high-level signal, the freewheeling tube is controlled to be turned off, and in the negative half cycle of the AC power supply, when the inductor current signal is detected as a low-level signal, the freewheeling tube is controlled to be turned off. Alternatively, it can also be that in the positive half cycle of the AC power supply, when the inductor current signal is detected as a low-level signal, the freewheeling tube is controlled to be turned off, and in the negative half cycle of the AC power supply, when the inductor current signal is detected as a high-level signal, the freewheeling tube is controlled to be turned off. Specifically, it can be determined according to the circuit design of the current acquisition module in the PFC totem pole circuit, for example, it can be determined according to whether the first voltage minus the second voltage or the second voltage minus the first voltage when comparing the collected first voltage with the preset second voltage. It should be noted that the value of the preset second voltage here is not fixed, and can change according to the actual working conditions of the prototype such as the positive and negative half cycles of the AC power supply, input voltage, output power, Bus voltage, etc.

[0079] In the case of controlling the freewheeling tube to turn off according to the rising edge signal and the falling edge signal in the inductor current signal, specifically, in the positive half cycle of the AC power supply, when the inductor current signal is detected as a rising edge signal, the freewheeling tube is controlled to be turned off, and in the negative half cycle of the AC power supply, when the inductor current signal is detected as a falling edge signal, the freewheeling tube is controlled to be turned off. Alternatively, it can also be that in the positive half cycle of the AC power supply, when the inductor current signal is detected as a falling edge signal, the freewheeling tube is controlled to be turned off, and in the negative half cycle of the AC power supply, when the inductor current signal is detected as a rising edge signal, the freewheeling tube is controlled to be turned off. Specifically, it can be determined according to the circuit design of the current acquisition module in the PFC totem pole circuit, for example, it can be determined according to whether the first voltage minus the second voltage or the second voltage minus the first voltage when comparing the collected first voltage with the preset second voltage. It should be noted that the value of the preset second voltage here is not fixed, and can change according to the actual working conditions of the prototype such as the positive and negative half cycles of the AC power supply, input voltage, output power, Bus voltage, etc.

[0080] When the freewheeling diode is controlled to be turned off according to the current signal, the freewheeling diode may be controlled to be turned off when the current signal reaches a preset current value. The preset current value may be a current value flowing through the inductor when the full range ZVS of the main tube is achieved.

[0081] In the embodiment of the present application, the principle of achieving full range ZVS of the main tube is as follows:

[0082] The inductor voltage signal can represent the voltage across the inductor. When the inductor voltage signal is a high level signal or a low level signal, the main tube is controlled to be turned on, or when the inductor voltage signal is a rising edge signal or a falling edge signal, the main tube is controlled to be turned on, so that when the voltage across the inductor is reversed, the main tube is controlled to be turned on. At this time, the voltage across the main tube is 0, thereby achieving ZVS of the main tube. The inductor current signal can represent the current flowing through the inductor. When the inductor current signal is a high level signal or a low level signal, the freewheeling tube is controlled to be turned off, or when the inductor current signal is a rising edge signal or a falling edge signal, the freewheeling tube is controlled to be turned off, or when the current signal reaches a preset current value, the current flowing through the inductor reaches a preset value. At this time, the resonance of the inductor and the capacitor in the circuit can resonate the voltage across the main tube to 0, thereby achieving ZVS of the main tube.

[0083] In order to facilitate understanding of the ZVS implementation method provided in the embodiment of the present application, the following will be Figure 3 Taking the PFC totem pole circuit shown in the figure as an example, the control process of the main tube and the freewheeling tube is explained in detail.

[0084] exist Figure 3In the PFC totem pole circuit shown, when the AC power supply Vac is in the positive half cycle, VT2 is turned on, VT1 is turned off, VT4 is the main tube, and VT3 is the freewheeling tube. When the AC power supply Vac is in the negative half cycle, VT1 is turned on, VT2 is turned off, VT3 is the main tube, and VT4 is the freewheeling tube.

[0085] In the initial stage of the positive half cycle of the AC power supply Vac, the driving circuit controls the shut-off of the main tube VT4 and the freewheeling tube VT3, that is, the main tube VT4 and the freewheeling tube VT3 are in the shut-off state by default. Afterwards, when the main tube VT4 and the freewheeling tube VT3 are controlled, the control flow is as follows:

[0086] Step 1: The processor receives the voltage signal output by the second signal sampling circuit, determines the inductor voltage signal according to the voltage signal, and outputs the inductor voltage signal to the drive circuit. The drive circuit controls the main tube VT4 to open according to the inductor voltage signal.

[0087] Step 2: The processor calculates the voltage according to the input voltage (Vac), BUS voltage (i.e. Figure 3 The voltage across the capacitor shown), the inductance (the inductance of the inductor L), the phase-locked loop and other information are used to calculate the opening time T1 of the main tube VT4 and output T1 to the drive circuit.

[0088] Step 3: After the on time of main tube VT4 reaches T1, the driving circuit controls main tube VT4 to turn off.

[0089] Step 4: The driving circuit controls the opening of the freewheeling tube VT3 according to the preset dead time, that is, after the driving circuit controls the closing of the main tube VT4, when the closing time reaches the preset dead time, the freewheeling tube VT3 is controlled to be opened.

[0090] Step 5: The processor receives the voltage signal output by the first signal sampling circuit, determines the inductor current signal according to the voltage signal, and outputs the inductor current signal to the drive circuit, and the drive circuit controls the shutdown of the freewheeling tube VT3 according to the inductor current signal.

[0091] Step 6: After the drive circuit controls the freewheeling tube VT3 to be turned off, the process can return to the above step 1, that is, controlling the main tube VT4 to be turned on according to the inductor voltage signal.

[0092] In the positive half cycle of the AC power source Vac, by cyclically executing the above steps 1 to 6, VT3 and VT4 can be opened alternately. When VT3 and VT4 are opened alternately, the AC power source can be converted into a DC output.

[0093] In the initial stage of the negative half cycle of the AC power supply Vac, the driving circuit controls the shut-off of the main tube VT3 and the freewheeling tube VT4, that is, the main tube VT3 and the freewheeling tube VT4 are in the shut-off state by default. Afterwards, when the main tube VT3 and the freewheeling tube VT4 are controlled, the control flow is as follows:

[0094] Step 7: The processor receives the voltage signal output by the second signal sampling circuit, determines the inductor voltage signal according to the voltage signal, and outputs the inductor voltage signal to the drive circuit. The drive circuit controls the main tube VT3 to be turned on according to the inductor voltage signal.

[0095] Step 8: The processor calculates the voltage according to the input voltage (Vac), BUS voltage (i.e. Figure 3 The voltage across the capacitor shown), the inductance (the inductance of the inductor L), the phase-locked loop and other information are used to calculate the opening time T2 of the main tube VT3 and output T2 to the drive circuit.

[0096] Step 9: After the on time of main tube VT3 reaches T2, the driving circuit controls main tube VT3 to be turned off.

[0097] Step 10: The driving circuit controls the opening of the freewheeling tube VT4 according to the preset dead time, that is, after the driving circuit controls the closing of the main tube VT3, when the closing time reaches the preset dead time, the freewheeling tube VT4 is controlled to be opened.

[0098] Step 11: The processor receives the voltage signal output by the first signal sampling circuit, determines the inductor current signal according to the voltage signal, and outputs the inductor current signal to the drive circuit, and the drive circuit controls the shutdown of the freewheeling tube VT4 according to the inductor current signal.

[0099] Step 12: After the driving circuit controls the freewheeling tube VT4 to be turned off, the process can return to the above step 7, that is, controlling the main tube VT3 to be turned on according to the inductor voltage signal.

[0100] In the negative half cycle of the AC power source Vac, by cyclically executing the above steps 7 to 12, VT3 and VT4 can be opened alternately. When VT3 and VT4 are opened alternately, the AC power source can be converted into a DC output.

[0101] Based on the above control process, since in the positive and negative half cycles of the AC power supply Vac, the main tube can be accurately controlled to be turned on according to the collected inductor voltage signal, and the freewheeling tube can be accurately controlled to be turned off according to the collected inductor current signal, therefore, the full range ZVS of the main tube in the positive and negative half cycles of the AC power supply can be achieved, effectively reducing the switching loss.

[0102] Based on the technical solution provided in the embodiment of the present application, a current acquisition module and a voltage acquisition module are added to the PFC totem pole circuit, and the current acquisition module is used to acquire the inductor current signal of the inductor, and the voltage acquisition module is used to acquire the inductor voltage signal of the inductor, and then the freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal. Thus, the main tube and the freewheeling tube can be precisely controlled by the acquired signals, so that full-range ZVS can be achieved while precisely controlling the main tube and the freewheeling tube, thereby effectively reducing switching losses.

[0103] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] Figure 6 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. Figure 6 At the hardware level, the electronic device includes a processor, and optionally also includes an internal bus, a network interface, and a memory. The memory may include a memory, such as a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Of course, the electronic device may also include hardware required for other services.

[0105] The processor, network interface and memory can be interconnected through an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0106] The memory is used to store the program. Specifically, the program may include a program code, and the program code includes a computer operation instruction. The memory may include a memory and a non-volatile memory, and provides instructions and data to the processor.

[0107] The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it, forming a ZVS implementation device at the logical level. The processor executes the program stored in the memory and is specifically used to perform the following operations:

[0108] Collecting the inductor current signal of the inductor by the current collection module;

[0109] Collecting the inductor voltage signal of the inductor by the voltage collection module;

[0110] The freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal.

[0111] The above application Figure 6 The method performed by the ZVS implementation device disclosed in the illustrated embodiment can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in software form. The above processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in this application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in this application can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0112] The electronic device may also perform Figure 5 The method and implementation of ZVS device in Figure 5 The functions in the illustrated embodiments will not be described in detail in this application.

[0113] Of course, in addition to software implementation methods, the electronic device of the present application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc. That is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0114] The present application also proposes a computer-readable storage medium, which stores one or more programs, wherein the one or more programs include instructions, which, when executed by a portable electronic device including a plurality of application programs, enable the portable electronic device to execute Figure 5 The method of the embodiment shown is specifically used to perform the following operations:

[0115] Collecting the inductor current signal of the inductor by the current collection module;

[0116] Collecting the inductor voltage signal of the inductor by the voltage collection module;

[0117] The freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal.

[0118] Figure 7 This is a schematic diagram of the structure of a ZVS implementation device 70 according to an embodiment of the present application. Figure 7 In a software implementation, the ZVS implementation device 70 may include: a first signal acquisition module 71, a second signal acquisition module 72 and a control module 73, wherein:

[0119] A first signal acquisition module 71, which acquires an inductor current signal of the inductor through a current acquisition module;

[0120] The second signal acquisition module 72 acquires the inductor voltage signal of the inductor through the voltage acquisition module;

[0121] The control module 73 controls the freewheeling tube according to the inductor current signal, and controls the main tube according to the inductor voltage signal.

[0122] Optionally, the current acquisition module includes a shunt and a first signal sampling circuit, the shunt is connected in series with the inductor, and the first signal sampling circuit is connected in parallel with the shunt; wherein the first signal acquisition module 71 collects the inductor current signal of the inductor through the current acquisition module, including:

[0123] Collecting a first voltage across the shunt through the first signal sampling circuit;

[0124] The first voltage is processed to obtain the inductor current signal.

[0125] Optionally, the first signal sampling module 71 processes the first voltage to obtain the inductor current signal, including:

[0126] comparing the first voltage with a preset second voltage, and determining the inductor current signal according to the comparison result; or,

[0127] A current signal flowing through the shunt is determined according to the first voltage and the resistance value of the shunt; and the current signal is determined as the inductor current signal.

[0128] Optionally, the voltage acquisition module includes an auxiliary winding and a second signal sampling circuit, the auxiliary winding is coupled to the inductor, and the second signal sampling circuit is connected in parallel with the auxiliary winding; wherein the second signal acquisition module 71 collects the inductor voltage signal of the inductor through the voltage acquisition module, including:

[0129] Collecting a third voltage and a fourth voltage at two ends of the auxiliary winding by the second signal sampling circuit;

[0130] The third voltage is compared with the fourth voltage, and the inductor voltage signal is determined according to the comparison result.

[0131] Optionally, the control module 73 controls the freewheeling tube according to the inductor current signal, and controls the main tube according to the inductor voltage signal, including:

[0132] When the freewheeling tube is turned off, controlling the main tube to be turned on according to the inductor voltage signal;

[0133] When the main tube is turned off, the freewheeling tube is turned on according to a preset dead time;

[0134] When the freewheeling tube is turned on, the freewheeling tube is controlled to be turned off according to the inductor current signal.

[0135] Optionally, the control module 73, when controlling the main pipe to be opened according to the inductor voltage signal, further comprises:

[0136] determining the opening hours of said supervisor;

[0137] When the switch-on time is reached, the main pipe is switched off.

[0138] Optionally, the control module 73 determines the activation time of the supervisor, including:

[0139] Determining the opening time of the main tube according to the circuit parameters of the PFC totem pole circuit;

[0140] The circuit parameters include at least one of an input voltage, a BUS voltage, an inductance and a phase-locked loop of the PFC totem pole circuit.

[0141] Optionally, the inductor voltage signal includes a high level signal, a low level signal, a rising edge signal and a falling edge signal; wherein the control module 73 controls the main tube to be opened according to the inductor voltage signal, including:

[0142] According to the high level signal and the low level signal, control the main tube to be opened; or,

[0143] The main pipe is controlled to be opened according to the rising edge signal and the falling edge signal.

[0144] Optionally, the inductor current signal includes a high level signal, a low level signal, a rising edge signal and a falling edge signal, or the inductor current signal is a current signal; wherein the control module 73 controls the freewheeling tube to be turned off according to the inductor current signal, including:

[0145] Control the freewheeling tube to turn off according to the high level signal and the low level signal; or,

[0146] Control the freewheeling tube to turn off according to the rising edge signal and the falling edge signal; or,

[0147] When the current signal reaches a preset current value, the freewheeling tube is controlled to be turned off.

[0148] The ZVS implementation device 70 provided in the present application can also execute Figure 5 The method and the ZVS implementation device 70 are implemented in Figure 5 The functions of the illustrated embodiments will not be described in detail in this application.

[0149] In short, the above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0150] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0151] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0152] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0153] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

Claims

1. A PFC totem pole circuit, comprising an AC power supply, an inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a current acquisition module, a voltage acquisition module and a capacitor, wherein: One side of the AC power supply is connected to the first end of the first switch tube and the first end of the second switch tube respectively, the other side of the AC power supply is connected to the first end of the third switch tube and the first end of the fourth switch tube respectively through the current acquisition module and the inductor, the second end of the third switch tube is connected to the second end of the first switch tube, the second end of the fourth switch tube is connected to the second end of the second switch tube, the voltage acquisition module is connected in parallel with the inductor, and the capacitor is connected in parallel with the third switch tube and the fourth switch tube; The current acquisition module is used to acquire the inductor current signal of the inductor, and the voltage acquisition module is used to acquire the inductor voltage signal of the inductor. The inductor current signal is used to control the freewheeling tube, and the inductor voltage signal is used to control the main tube; wherein, the third switch tube is the main tube, and the fourth switch tube is the freewheeling tube, or, the fourth switch tube is the main tube, and the third switch tube is the freewheeling tube.

2. The PFC totem pole circuit according to claim 1, wherein in the positive half cycle of the AC power supply, the second switch tube is turned on, the first switch tube is turned off, the fourth switch tube is the main tube, and the third switch tube is the freewheeling tube; In the negative half cycle of the AC power supply, the first switch tube is turned on, the second switch tube is turned off, the third switch tube is the main switch, and the fourth switch tube is the freewheeling tube.

3. The PFC totem pole circuit according to claim 1, wherein the current acquisition module comprises a shunt and a first signal sampling circuit, the shunt is connected in series with the inductor, and the first signal sampling circuit is connected in parallel with the shunt.

4. The PFC totem pole circuit according to claim 1, wherein the voltage acquisition module comprises an auxiliary winding and a second signal sampling circuit, the auxiliary winding is coupled to the inductor, and the second signal sampling circuit is connected in parallel to the auxiliary winding.

5. The PFC totem pole circuit according to claim 1, further comprising a driving module, wherein an input end of the driving module is respectively connected to an output end of the current acquisition module and an output end of the voltage acquisition module, and an output end of the driving module is respectively connected to a control end of the third switch tube and a control end of the fourth switch tube; in, The driving module is used to control the freewheeling tube according to the inductor current signal, and to control the main tube according to the inductor voltage signal.

6. The PFC totem pole circuit according to any one of claims 1 to 5, wherein the inductor, the current acquisition module, the voltage acquisition module, the third switch tube and the fourth switch tube constitute a single-phase circuit of the PFC totem pole circuit, and the PFC totem pole circuit includes a plurality of the single-phase circuits, and each single-phase circuit has the same circuit structure; in, The phase difference between the driving signal of the Nth phase circuit and the driving signal of the N-1th phase circuit is 2π / N, the driving signal includes the inductor current signal and the inductor voltage signal, and N is an integer greater than 1.

7. A ZVS implementation method, applied to the PFC totem pole circuit according to any one of claims 1 to 6, comprising: Collecting the inductor current signal of the inductor by the current collection module; Collecting the inductor voltage signal of the inductor by the voltage collection module; The freewheeling tube is controlled according to the inductor current signal, and the main tube is controlled according to the inductor voltage signal.

8. The method according to claim 7, wherein the current acquisition module comprises a shunt and a first signal sampling circuit, the shunt is connected in series with the inductor, and the first signal sampling circuit is connected in parallel with the shunt; wherein, The collecting the inductor current signal of the inductor by the current collecting module includes: Collecting a first voltage across the shunt through the first signal sampling circuit; The first voltage is processed to obtain the inductor current signal.

9. The method according to claim 8, wherein the processing of the first voltage to obtain the inductor current signal comprises: Comparing the first voltage with a preset second voltage, and determining the inductor current signal according to the comparison result; or, determining a current signal flowing through the shunt according to the first voltage and the resistance value of the shunt; The current signal is determined as the inductor current signal.

10. The method according to claim 7, wherein the voltage acquisition module comprises an auxiliary winding and a second signal sampling circuit, the auxiliary winding is coupled with the inductor, and the second signal sampling circuit is connected in parallel with the auxiliary winding; wherein, The collecting of the inductor voltage signal of the inductor by the voltage collecting module includes: Collecting a third voltage and a fourth voltage at two ends of the auxiliary winding by the second signal sampling circuit; The third voltage is compared with the fourth voltage, and the inductor voltage signal is determined according to the comparison result.

11. The method according to claim 7, wherein the controlling the freewheeling tube according to the inductor current signal and the controlling the main tube according to the inductor voltage signal comprises: When the freewheeling tube is turned off, controlling the main tube to be turned on according to the inductor voltage signal; When the main tube is turned off, the freewheeling tube is turned on according to a preset dead time; When the freewheeling tube is turned on, the freewheeling tube is controlled to be turned off according to the inductor current signal.

12. The method according to claim 11, wherein, in the case where the main pipe is controlled to be turned on according to the inductor voltage signal, the method further comprises: determining the opening hours of said supervisor; When the switch-on time is reached, the main pipe is switched off.

13. The method of claim 12, wherein determining the activation time of the supervisor comprises: Determining the opening time of the main tube according to the circuit parameters of the PFC totem pole circuit; The circuit parameters include at least one of an input voltage, a BUS voltage, an inductance and a phase-locked loop of the PFC totem pole circuit.

14. The method according to claim 11, wherein the inductor voltage signal comprises a high level signal, a low level signal, a rising edge signal and a falling edge signal; wherein, The controlling the main pipe to be opened according to the inductor voltage signal comprises: According to the high level signal and the low level signal, control the main tube to be opened; or, The main pipe is controlled to be opened according to the rising edge signal and the falling edge signal.

15. The method according to claim 11, wherein the inductor current signal comprises a high level signal, a low level signal, a rising edge signal and a falling edge signal, or the inductor current signal is a current signal; wherein, The controlling the freewheeling tube to turn off according to the inductor current signal comprises: Control the freewheeling tube to turn off according to the high level signal and the low level signal; or, Control the freewheeling tube to turn off according to the rising edge signal and the falling edge signal; or, When the current signal reaches a preset current value, the freewheeling tube is controlled to be turned off.

16. An electronic device comprising: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 7 to 15.

17. A computer-readable storage medium, when instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method according to any one of claims 7 to 15.

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