Power supply device, control method thereof, apparatus, storage medium, and product

Abstract

The invention discloses a power supply device, a control method thereof, equipment, a storage medium and a product, the power supply device comprises a PFC circuit and an auxiliary power supply circuit, and the PFC circuit comprises a first inductor and at least one switch tube; the auxiliary power supply circuit comprises a second inductor, the second inductor is magnetically coupled with the first inductor, and when the PFC circuit operates, the auxiliary power supply circuit is used for generating an auxiliary electric signal based on the induction electric energy of the second inductor; the auxiliary power supply circuit further comprises a switch module and a first capacitor; the auxiliary electric signal is used for charging the first capacitor; the switch module is used for controlling the power-on state of the second inductor. When the PFC circuit of the power supply device runs, the auxiliary power supply circuit outputs an auxiliary electric signal, and meanwhile, the second inductor stores energy; the second inductor is controlled by the switch module to pass current; and after the switch module is switched off, under the mutual inductance effect, the first inductor carries out reverse follow current to consume the electric quantity stored by the stray capacitor of the switch tube of the PFC circuit, so that zero-voltage switching-on of the switch tube of the PFC circuit is realized.

Description

Technical Field

[0001] This application relates to soft-switching startup technology, and more particularly to a power supply device and its control method, apparatus, storage medium and product. Background Technology

[0002] Power factor correction (PFC) circuits are used to control the waveform of the input current, so that the waveforms of the input current and input voltage are synchronized, thereby improving the power factor, reducing harmonic content, and solving electromagnetic interference and capacitor compatibility issues.

[0003] In related technologies, Continuous Conduction Mode (CCM) is commonly used to control the operation of PFC circuits. However, because the switching transistors in PFC circuits are hard-switched, significant switching losses and noise are generated during transistor operation. To reduce these switching losses, some related technologies employ Discontinuous Conduction Mode (DCM) or Critical Conduction Mode (CRM) to control the PFC circuit. Since the inductor current of the PFC circuit drops to zero within a switching cycle, zero-current switching (ZCS) can be achieved, reducing switching losses. However, using DCM or CRM modes to control the PFC circuit only achieves zero-current switching; due to the parasitic capacitance of the transistors, zero-voltage switching cannot be achieved simultaneously, and switching losses still exist when the transistors are turned on. Summary of the Invention

[0004] In view of this, embodiments of this application provide a power supply device and its control method, apparatus, storage medium and product, which aim to reduce the switching losses of the switching transistor in the PFC circuit and achieve zero-voltage turn-on of the switching transistor.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a power supply device, the power supply device comprising:

[0007] A PFC circuit includes a first inductor and at least one switching transistor, the PFC circuit being used to operate based on the at least one switching transistor to improve the power factor of the input power supply of the power supply device;

[0008] An auxiliary power supply circuit includes a second inductor, which is magnetically coupled to the first inductor. When the PFC circuit is running, the auxiliary power supply circuit generates an auxiliary electrical signal based on the induced electrical energy of the second inductor.

[0009] The auxiliary power supply circuit also includes a switching module and a first capacitor, wherein the auxiliary electrical signal is used to charge the first capacitor; and the switching module is used to control the energizing state of the second inductor.

[0010] The second inductor carries current during the turn-on period of the switching module; based on the mutual inductance between the second inductor and the first inductor, the at least one switching transistor is turned on with zero voltage.

[0011] In some implementations, the auxiliary power supply circuit is connected to a first load, and the second inductor carries current during the turn-on of the switching module, specifically including:

[0012] During the turn-on period of the switching module, the second inductor discharges to the first capacitor and / or the first load;

[0013] The first capacitor discharges through the second inductor.

[0014] In some embodiments, a first terminal of the first inductor is connected to the at least one switching transistor, and the PFC circuit further includes:

[0015] The second capacitor is connected to the second terminal of the first inductor.

[0016] In some implementations, the PFC circuit is a Boost PFC circuit, the first capacitor is disposed between the first terminal of the second inductor and the ground terminal, and the switching module is disposed between the second terminal of the second inductor and the ground terminal;

[0017] Wherein, the first terminal of the first inductor and the first terminal of the second inductor are terminals with the same name.

[0018] In some implementations, the PFC circuit is a totem-pole PFC circuit, and the switching module includes:

[0019] A first switching module is disposed between the first end of the second inductor and the first end of the first capacitor;

[0020] The second switching module is disposed between the second end of the second inductor and the first end of the first capacitor;

[0021] Wherein, the second end of the first capacitor is connected to the ground terminal, the second inductor is provided with an intermediate connection, and the intermediate connection is connected to the ground terminal; the first end of the first inductor and the first end of the second inductor are terminals with the same name.

[0022] In some implementations, the first capacitor is a polarized capacitor and the second capacitor is a non-polarized capacitor.

[0023] Secondly, embodiments of this application provide a control method for a power supply device as described in the first aspect, the method comprising:

[0024] When the PFC circuit is running, it controls the switching module to turn on, so that the second inductor is energized;

[0025] After the switch module is turned on for a set time, the switch module is turned off so that the second inductor is no longer energized.

[0026] During the turn-on period of the switch module, after the second inductor discharges, the first capacitor discharges to the second inductor.

[0027] In some implementations, the PFC circuit is a Boost PFC circuit. When the PFC circuit is running, it controls the switching module to turn on, including:

[0028] When the PFC circuit is running, the voltage value of the auxiliary electrical signal is acquired;

[0029] If the voltage value of the auxiliary electrical signal drops to a set voltage threshold, the switch module is controlled to turn on.

[0030] In some implementations, the PFC circuit is a totem-pole PFC circuit. The switching module includes a first switching module and a second switching module. The first switching module is disposed between a first terminal of the second inductor and a first terminal of the first capacitor. The second switching module is disposed between a second terminal of the second inductor and a first terminal of the first capacitor. The second terminal of the first capacitor is connected to a ground terminal. The second inductor has an intermediate connection, which is connected to a ground terminal. When the PFC circuit is running, controlling the switching module to turn on includes:

[0031] When the PFC circuit is running, the voltage polarity of the input power supply is obtained;

[0032] If the input power supply enters the positive half-cycle of the voltage, the first switching module is controlled to turn on.

[0033] If the input power supply enters the negative half-cycle of the voltage, the second switching module is turned on.

[0034] In some implementations, the method further includes:

[0035] The PFC circuit is controlled to operate based on either the intermittent conduction (DCM) mode or the critical conduction (CRM) mode.

[0036] Thirdly, embodiments of this application provide an electronic device, which includes a power supply device as described in the first aspect, and further includes a controller, wherein...

[0037] The controller is configured to perform the steps of the method as described in the second aspect when running a computer program.

[0038] Fourthly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a controller, implements the steps of the method described in the second aspect.

[0039] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a controller, implements the steps of the method as described in the second aspect.

[0040] This application provides a power supply device, including a PFC circuit and an auxiliary power supply circuit. The PFC circuit includes a first inductor and at least one switching transistor. The PFC circuit operates based on the at least one switching transistor to improve the power factor of the input power supply of the power supply device. The auxiliary power supply circuit includes a second inductor, which is magnetically coupled to the first inductor. When the PFC circuit is running, the auxiliary power supply circuit generates an auxiliary electrical signal based on the induced electrical energy of the second inductor. The auxiliary power supply circuit also includes a switching module and a first capacitor. The auxiliary electrical signal is used to charge the first capacitor. The switching module controls the energizing state of the second inductor. The second inductor carries current during the turn-on period of the switching module. Based on the mutual inductance between the second inductor and the first inductor, at least one switching transistor is turned on with zero voltage. Thus, when the PFC circuit of the power supply device in this embodiment is running, the auxiliary power supply circuit outputs an auxiliary electrical signal, and the second inductor stores energy. The second inductor is controlled to discharge by the switching module. After the energy stored in the second inductor is exhausted, the first capacitor discharges to the second inductor, and the second inductor is supplied with a reverse current. After the switching module is turned off, under the mutual inductance, the first inductor continues to flow in reverse to consume the energy stored in the parasitic capacitance of the switching transistor of the PFC circuit, thereby achieving zero-voltage turn-on of the switching transistor of the PFC circuit and reducing the switching loss of the switching transistor of the PFC circuit. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a power supply device according to an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of a PFC circuit according to an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of another PFC circuit according to an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of another power supply device according to an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of another power supply device according to an embodiment of this application;

[0046] Figure 6 This is a schematic flowchart of the control method of the power supply device according to an embodiment of this application;

[0047] Figure 7 This is a timing diagram of the voltage and current of a power supply device according to an embodiment of this application;

[0048] Figure 8 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application;

[0049] Figure 9 This is a schematic diagram of the structure of another electronic device according to an embodiment of this application;

[0050] Figure 10 This is a schematic diagram of the structure of a flyback switching power supply module in one application example of this application. Detailed Implementation

[0051] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0053] This application provides a power supply device, such as... Figure 1As shown, the power supply device includes a PFC circuit 100 and an auxiliary power supply circuit 200. The PFC circuit 100 includes a first inductor L1 and at least one switching transistor. The PFC circuit operates based on at least one switching transistor to improve the power factor of the power supply's input power. The auxiliary power supply circuit 200 includes a second inductor L2, which is magnetically coupled to the first inductor L1. When the PFC circuit 100 is running, the auxiliary power supply circuit 200 generates an auxiliary electrical signal based on the induced energy of the second inductor L2. The auxiliary power supply circuit 200 also includes a switching module 201 and a first capacitor C1. The auxiliary electrical signal is used to charge the first capacitor C1. The switching module 201 controls the energizing state of the second inductor L2. During the on-state of the switching module 201, current flows through the second inductor L2; the power supply device, based on the mutual inductance between the second inductor L2 and the first inductor L1, enables at least one switching transistor of the PFC circuit 100 to turn on with zero voltage.

[0054] Here, the input power supply is connected to the power supply terminal of the PFC circuit 100. The PFC circuit 100 adjusts the waveform of the input current by controlling the on / off state of the switching transistor, so that the waveforms of the input current and input voltage are synchronized, thereby improving the power factor of the circuit and reducing harmonic content. The electrical signal processed by the PFC circuit 100 supplies power to the second load. The PFC circuit 100 in the power supply device of this embodiment can be of various forms, such as a Boost PFC circuit or a totem-pole PFC circuit.

[0055] For example, the PFC circuit 100 is a Boost PFC circuit, such as... Figure 2 As shown. The PFC circuit 100 includes a first switching transistor Q1 and a first inductor L1, as well as a rectifier module 101, a second capacitor C2, a first diode D1, and a third capacitor C3. The first end of the first inductor L1 is connected to the anodes of the first switching transistor Q1 and the first diode D1, respectively; the second end of the first inductor L1 is connected to the second capacitor C2; and the cathode of the first diode D1 is connected to the second load.

[0056] Understandably, the input power supply is rectified by the rectifier module 101 and then fed into the first inductor L1. The second capacitor C2 is the filter capacitor at the output of the rectifier module 101. The PFC circuit 100 controls the on / off state of the first switching transistor Q1, causing the first inductor L1 to switch between an energy storage state and a discharge state to adjust the waveform of the input current. The third capacitor C3 is the filter capacitor of the power supply device, used to ensure the stability of the power supply voltage to the second load.

[0057] For example, the PFC circuit 100 is a totem-pole PFC circuit, such as... Figure 3As shown. The PFC circuit 100 includes a first switch Q1, a first inductor L1, a second capacitor C2, and a third capacitor C3, as well as a second switch Q2, a third switch Q3, and a fourth switch Q4. The first switch Q1 and the second switch Q2 are high-frequency switches, together forming the switching arm of the totem-pole PFC circuit; the third switch Q3 and the fourth switch Q4 are rectifier switches, together forming the rectifier arm of the totem-pole PFC circuit.

[0058] Understandably, during the positive half-cycle of the input power supply voltage, the first switch Q1 acts as the active switch, and the totem-pole PFC circuit controls the on / off state of the first switch Q1, causing the first inductor L1 to switch between energy storage and discharge states to adjust the waveform of the input current. During the negative half-cycle of the input power supply voltage, the second switch Q2 acts as the active switch, and the totem-pole PFC circuit controls the on / off state of the second switch Q2, causing the first inductor L1 to switch between energy storage and discharge states to adjust the waveform of the input current.

[0059] Here, the embodiment of this application does not specifically limit the form of the switching transistor of the PFC circuit 100. The switching transistor of the PFC circuit 100 can be a transistor or a MOSFET, etc.

[0060] It should be noted that PFC circuits have multiple control modes, such as CCM mode, DCM mode, and CRM mode. In related technologies, to reduce the switching losses of the switching transistors in the PFC circuit, DCM mode or CRM mode can be used to control the PFC circuit operation. Specifically, when the PFC circuit operates in DCM or CRM mode, it controls the first switching transistor Q1 or the second switching transistor Q2 to turn off, causing the first inductor L1 to discharge. During the discharge of the first inductor L1, the current through the first inductor L1 drops to 0. Therefore, controlling the first switching transistor Q1 or the second switching transistor Q2 to turn on when the current through the first inductor L1 is 0 can achieve zero-current switching of the first switching transistor Q1 or the second switching transistor Q2.

[0061] However, the first switch Q1 and / or the second switch Q2 have parasitic capacitances. When the first switch Q1 or the second switch Q2 is in the off state, the parasitic capacitance of the switch and the first inductor L1 will oscillate in an LC manner. During the LC oscillation, the energy stored in the parasitic capacitance of the switch will not be exhausted. Therefore, when the current through the first inductor L1 is 0, the first switch Q1 or the second switch Q2 is turned on. Since the parasitic capacitance of the switch still stores energy, zero-voltage turn-on of the first switch Q1 or the second switch Q2 cannot be achieved. Switching losses still exist when the first switch Q1 or the second switch Q2 is turned on.

[0062] It should be noted that, in order to solve the above problems, the power supply device in this application embodiment further includes an auxiliary power supply circuit 200. Specifically, the second inductor L2 and the first inductor L1 of the auxiliary power supply circuit 200 are magnetically coupled. The auxiliary power supply circuit 200 can not only generate an auxiliary electrical signal under the magnetic field induction of the first inductor L1 to provide power to the first load, but also control the on / off state of the switching module 201 of the auxiliary power supply circuit 200 so that when the switching transistor of the PFC circuit 100 is in the off state, the energy stored in the parasitic capacitance is exhausted, thereby realizing zero-voltage turn-on of the switching transistor of the PFC circuit 100.

[0063] Specifically, if the PFC circuit 100 is a Boost PFC circuit, the auxiliary power supply circuit 200 is used to enable the first switch Q1 to turn on at zero voltage; if the PFC circuit 100 is a totem pole PFC circuit, the auxiliary power supply circuit 200 is used to enable the first switch Q1 and the second switch Q2 to turn on at zero voltage.

[0064] Here, if the switching transistor of the PFC circuit 100 is a MOSFET, the auxiliary power supply circuit 200 is specifically used to deplete the energy stored in the drain-drain parasitic capacitance of the MOSFET in the PFC circuit 100; if the switching transistor of the PFC circuit 100 is a transistor, the auxiliary power supply circuit 200 is specifically used to deplete the energy stored in the collector-emitter parasitic capacitance of the transistor in the PFC circuit 100.

[0065] For example, the auxiliary power supply circuit 200 is connected to the first load. The auxiliary power supply circuit 200 outputs an auxiliary electrical signal to supply power to the first load, and the voltage of the auxiliary electrical signal is determined based on the voltage of the input power supply, the number of turns of the first inductor L1, and the number of turns of the second inductor L2.

[0066] Here, the switch module 201 is used to control the energizing state of the second inductor L2. Specifically, the switch module 201 and the second inductor L2 together form a energizing circuit. During the off-state of the switch module 201, a energizing circuit cannot be formed across the two ends of the second inductor L2, and the second inductor L2 will not discharge. During the on-state of the switch module 201, the second inductor L2 forms a energizing circuit based on the switch module 201, and the second inductor L2 can carry current.

[0067] For example, the second inductor L2 carries current during the turn-on period of the switching module 201, specifically including: during the turn-on period of the switching module 201, the second inductor L2 discharges to the first capacitor C1 and / or the first load; the first capacitor C1 discharges to the second inductor L2.

[0068] It should be noted that the first capacitor C1 serves as the filter capacitor of the auxiliary power supply circuit 200. The auxiliary electrical signal generated by the second inductor L2 not only supplies power to the first load but also charges the first capacitor C1. After the switch module 201 is turned on, the switch module 201, the second inductor L2, and the first capacitor C1 form a power-on circuit, and the second inductor L2 discharges to the first capacitor C1. After the energy stored in the second inductor L2 is exhausted, the first capacitor C1 can discharge to the second inductor L2 because it stores energy.

[0069] It should be noted that when the second inductor L2 discharges, the current through the second inductor L2 flows from the second inductor L2 to the first capacitor C1. When the first capacitor C1 discharges to the second inductor L2, the current through the second inductor L2 flows from the first capacitor C1 to the second inductor L2. That is, during the turn-on period of the switch module 201, as the electrical energy stored in the second inductor L2 is depleted, the current direction through the second inductor L2 changes.

[0070] It should be noted that when the first capacitor C1 discharges to the second inductor L2, the direction of the current through the second inductor L2 changes, and the second inductor L2 generates a magnetic field in the opposite direction. If the switch module 201 is switched from the on state to the off state, the second inductor L2 can no longer be energized. Since the second inductor L2 and the first inductor L1 are magnetically coupled, under the excitation of the instantaneous change in the inductance current of the second inductor L2, the first inductor L1 begins to reverse freewheeling. At this time, the direction of the current through the first inductor L1 is opposite to the direction of the current when the first inductor L1 discharges to the second load and / or the third capacitor C3. Under the action of the reverse freewheeling of the first inductor L1, the parasitic capacitance of the switching transistor of the PFC circuit 100 is discharged through the first inductor L1.

[0071] Understandably, when the first inductor L1 is freewheeling in reverse, the parasitic capacitance of the switching transistor in the PFC circuit 100 can discharge to the second capacitor through the first inductor L1. By controlling the duration of the turn-on period of the switching module 201, the duration of the discharge of the first capacitor C1 to the second inductor L2 can be controlled. Thus, after the switching module 201 is turned off, the energy stored in the parasitic capacitance of the switching transistor in the PFC circuit 100 is exhausted during the reverse freewheeling period of the first inductor L1, thereby achieving zero-voltage turn-on of the switching transistor.

[0072] It is understood that when the PFC circuit 100 of the power supply device in this application embodiment is running, the auxiliary power supply circuit 200 outputs an auxiliary electrical signal, and the second inductor L2 stores energy. The second inductor L2 is controlled to discharge by the switching module 201. After the energy stored in the second inductor L2 is exhausted, the first capacitor C1 discharges to the second inductor L2, and the second inductor L2 is supplied with reverse current. After the switching module 201 is turned off, under the mutual inductance, the first inductor L1 continues to flow in reverse to consume the energy stored in the parasitic capacitance of the switching transistor of the PFC circuit 100, thereby realizing zero-voltage turn-on of the switching transistor of the PFC circuit 100 and reducing the switching loss of the switching transistor of the PFC circuit 100.

[0073] It should be noted that, Figure 1 The connection relationship between the second inductor L2, the switch module 201, and the first capacitor C1 shown is only used to indicate that the second inductor L2, the switch module 201, and the first capacitor C1 can form a power-on circuit, and that the power-on state of the second inductor L2 can be controlled based on the on / off state of the control switch module 201. It is not used to limit the specific connection relationships of the components and modules of the auxiliary power supply circuit 200. Depending on the different forms of the PFC circuit 100, the second inductor L2, the switch module 201, and the first capacitor C1 can be configured with corresponding connection relationships to achieve commutation power-on of the second inductor L2.

[0074] In some embodiments, the PFC circuit 100 is a Boost PFC circuit, such as... Figure 4 As shown, the first capacitor C1 is disposed between the first terminal of the second inductor L2 and the ground terminal, and the switch module 201 is disposed between the second terminal of the second inductor L2 and the ground terminal. The first terminals of the first inductor L1 and the first terminals of the second inductor L2 are terminals with the same name.

[0075] Here, the first terminal of the second inductor L2 is also connected to the first load (not shown in the figure).

[0076] It is easy to understand that when the first capacitor C1 discharges to the second inductor L2, the current through the second inductor L2 flows from the first end to the second end. Since the first end of the first inductor L1 and the first end of the second inductor L2 are the same name, after the switch module 201 is turned off, the current through the first inductor L1 flows from the first end to the second end, so that the parasitic capacitance of the first switch Q1 discharges to the second capacitor C2 through the first inductor L1.

[0077] For example, the PFC circuit 100 is a Boost PFC circuit, and the switching module 201 includes a fifth switch Q5 and a sixth switch Q6. The first terminal of the fifth switch Q5 is connected to the second terminal of the second inductor L2, the second terminal of the fifth switch Q5 is connected to the second terminal of the sixth switch Q6, and the first terminal of the sixth switch Q6 is connected to the ground terminal.

[0078] In one application example of this application, the fifth switch Q5 and the sixth switch Q6 are NMOS transistors, the first terminal of the fifth switch Q5 and the first terminal of the sixth switch Q6 are the drains, and the second terminal of the fifth switch Q5 and the second terminal of the sixth switch Q6 are the sources.

[0079] Understandably, when the fifth switch Q5 is off, the first capacitor C1 cannot discharge to the second inductor L2; when the sixth switch Q6 is off, the second inductor L2 cannot discharge to the first capacitor C1 and / or the first load. When the fifth switch Q5 and the sixth switch Q6 are on, the switch module 201 is turned on, a current-carrying circuit is formed across the two ends of the second inductor L2, and current flows through the second inductor L2.

[0080] In some embodiments, the PFC circuit 100 is a totem-pole PFC circuit, such as... Figure 5 As shown, the switch module 201 includes a first switch module 2011 and a second switch module 2012. The first switch module 2011 is disposed between the first terminal of the second inductor L2 and the first terminal of the first capacitor C1. The second switch module 2012 is disposed between the second terminal of the second inductor L2 and the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is connected to a ground terminal, and the second inductor L2 has a mid-terminal connection connected to the ground terminal; the first terminals of the first inductor L1 and the first terminals of the second inductor L2 are terminals of the same name.

[0081] Here, the first terminal of the first capacitor C1 is also connected to the first load (not shown in the figure).

[0082] It is easy to understand that during the positive half-cycle of the input power supply voltage, the first switching transistor Q1 acts as the active transistor, and the current of the input power supply flows from the second terminal of the first inductor L1 to the first terminal of the first inductor L1. At this time, the first switching module 2011 is turned on. When the first capacitor C1 discharges to the second inductor L2, the current through the second inductor L2 flows from the first terminal of the second inductor L2 to the intermediate connection. Since the first terminal of the first inductor L1 and the first terminal of the second inductor L2 are the same terminal, after the first switching module 2011 is turned off, the current through the first inductor L1 flows from the first terminal of the first inductor L1 to the second terminal, so that the parasitic capacitance of the first switching transistor Q1 discharges to the second capacitor C2 through the first inductor L1.

[0083] It is easy to understand that during the negative half-cycle of the input power supply voltage, the second switch Q2 acts as the active switch, and the current of the input power supply flows from the first terminal of the first inductor L1 to the second terminal of the first inductor L1. At this time, the second switch module 2012 is turned on. When the first capacitor C1 discharges to the second inductor L2, the current through the second inductor L2 flows from the second terminal of the second inductor L2 to the intermediate connection. Since the first terminal of the first inductor L1 and the first terminal of the second inductor L2 are the same terminal, after the second switch module 2012 is turned off, the current through the first inductor L1 flows from the second terminal of the first inductor L1 to the first terminal, so that the parasitic capacitance of the second switch Q2 discharges to the second capacitor C2 through the first inductor L1.

[0084] For example, the PFC circuit 100 is a totem pole PFC circuit, and the first switching module 2011 includes a seventh switch Q7 and an eighth switch Q8. The first terminal of the seventh switch Q7 is connected to the first terminal of the second inductor L2, the second terminal of the seventh switch Q7 is connected to the second terminal of the eighth switch Q8, and the first terminal of the eighth switch Q8 is connected to the first terminal of the first capacitor C1.

[0085] For example, the PFC circuit 100 is a totem pole PFC circuit, and the second switching module 2012 includes a ninth switch Q9 and a tenth switch Q10. The first terminal of the ninth switch Q9 is connected to the second terminal of the second inductor L2, the second terminal of the ninth switch Q9 is connected to the second terminal of the tenth switch Q10, and the first terminal of the tenth switch Q10 is connected to the first terminal of the first capacitor C1.

[0086] In one application example of this application, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9, and the tenth switch Q10 are NMOS transistors. The first terminal of the seventh switch Q7, the first terminal of the eighth switch Q8, the first terminal of the ninth switch Q9, and the first terminal of the tenth switch Q10 are the drains, and the second terminal of the seventh switch Q7, the second terminal of the eighth switch Q8, the second terminal of the ninth switch Q9, and the second terminal of the tenth switch Q10 are the sources.

[0087] Understandably, when the seventh switch Q7 and the ninth switch Q9 are in the off state, the first capacitor C1 cannot discharge to the second inductor L2; when the eighth switch Q8 and the tenth switch Q10 are in the off state, the second inductor L2 cannot discharge to the first capacitor C1 and / or the first load. When the seventh switch Q7 and the eighth switch Q8 are in the on state, the first switch module 2011 is turned on, and the second inductor L2 carries current; when the ninth switch Q9 and the tenth switch Q10 are in the on state, the second switch module 2012 is turned on, and the second inductor L2 carries current.

[0088] For example, the first capacitor C1 is a polarized capacitor and the second capacitor C2 is a non-polarized capacitor.

[0089] It is understandable that the first terminal of the first capacitor C1 is the positive terminal and the second terminal of the first capacitor C1 is the negative terminal. If the PFC circuit 100 is a Boost PFC circuit, then the first terminal of the first capacitor C1 is connected to the first terminal of the second inductor L2.

[0090] It is understandable that if the PFC circuit 100 is a totem pole PFC circuit, the voltage polarity of the input power supply of the second capacitor C2 will change periodically, so the second capacitor C2 is selected as a non-polar capacitor.

[0091] Based on the aforementioned power supply device, embodiments of this application also provide a control method for the power supply device, such as... Figure 6 As shown, the method includes:

[0092] Step 601: When the PFC circuit is running, the control switch module is turned on, so that the second inductor is energized.

[0093] Step 602: After the switch module has been turned on for a set time, the switch module is turned off so that the second inductor is no longer energized.

[0094] During the turn-on period of the switching module, after the second inductor discharges, the first capacitor discharges to the second inductor.

[0095] It is understandable that during the turn-on period of the switch module 201, since the current direction of the second inductor L2 has reversed, this embodiment controls the switch module 201 to turn off. Based on the reverse current passing through the second inductor L2, the first inductor L1 is excited to start reverse freewheeling, so that the energy stored in the parasitic capacitance of the switch of the PFC circuit 100 is depleted, thereby realizing the zero-voltage turn-on of the switch of the PFC circuit 100.

[0096] It should be noted that the set duration is the turn-on duration of the switching module 201. The set duration includes the discharge duration of the second inductor L2 and the discharge duration of the first capacitor C1. The discharge duration of the first capacitor C1 should at least ensure that, after the switching module 201 is turned off, the energy stored in the parasitic capacitance of the switching transistor in the PFC circuit 100 is depleted during the reverse freewheeling period of the first inductor L1. In one application example, the discharge duration of the first capacitor C1 can be determined based on the following formula:

[0097]

[0098] Among them, t ondelay L1 is the discharge time of the first capacitor C1, L2 is the inductance value of the second inductor, and C... QDS Let C be the parasitic capacitance value of the switching transistor in PFC circuit 100. If the switching transistor in PFC circuit 100 is a MOSFET, then C... QDSU is the drain-drain parasitic capacitance value of the MOSFET in PFC circuit 100; out U is the output voltage value of PFC circuit 100; cc This is the output voltage value of the auxiliary electrical signal.

[0099] For example, the method further includes controlling the operation of the PFC circuit based on DCM mode or CRM mode.

[0100] It should be noted that the control method of this application embodiment requires the control switch module 201 to turn off so that the first inductor L1 can reverse freewheeling. Therefore, the switch module 201 needs to be turned off during the period when the inductance current of the first inductor L1 is 0. In order to make the inductance current of the first inductor L1 0, this application embodiment controls the operation of the PFC circuit 100 based on DCM mode or CRM mode.

[0101] For example, the PFC circuit 100 is a Boost PFC circuit. When the PFC circuit is running, the control switch module is turned on, including: when the PFC circuit is running, acquiring the voltage value of the auxiliary electrical signal; if the voltage value of the auxiliary electrical signal drops to a set voltage threshold, the control switch module is turned on.

[0102] Here, the control switch module is turned on, including the control of the fifth switch tube and the sixth switch tube.

[0103] This application provides a timing diagram of the power supply voltage and current when the PFC circuit 100 is a Boost PFC circuit, as shown in the embodiment. Figure 7As shown. At time t1, the first switch Q1 is turned on, the first inductor L1 stores energy, and the inductor current of the first inductor L1 increases linearly; at this time, the fifth switch Q5 and the sixth switch Q6 are turned off, the second inductor L2 stores energy, and the inductor current of the second inductor L2 is 0; at time t2, the first switch Q1 is turned off, the first inductor L1 supplies power to the second load through the first diode D1, the inductor current of the first inductor L1 decreases linearly, and the source-drain parasitic capacitance of the first switch Q1 is charged; as the inductor current of the first inductor L1 decreases linearly, the voltage of the auxiliary signal gradually decreases. At time t3, the voltage value of the auxiliary signal drops to the set voltage threshold, then the fifth switch Q5 and the sixth switch Q6 are turned on, and the second inductor L2 discharges the stored energy to the first capacitor C1 and / or the first load. At this time, the inductor current of the second inductor L2 increases linearly with the first diode D1. The inductor current of inductor L1 decreases linearly. At time t4, the inductor currents of the first inductor L1 and the second inductor L2 drop to 0, and the first inductor L1 is no longer energized. At this time, since the fifth switch Q5 and the sixth switch Q6 are in the on state, the first capacitor C1 discharges to the second inductor L2, and the second inductor L2 carries a reverse current. At time t5, the fifth switch Q5 and the sixth switch Q6 are turned off, and the inductor current of the second inductor L2 drops to 0 instantaneously. Under the excitation of the change in the inductor current of the second inductor L2, the first inductor L1 freewheels in reverse, and the voltage value of the source-drain parasitic capacitance of the first switch Q1 begins to decrease. At time t6, the voltage value of the source-drain parasitic capacitance of the first switch Q1 is 0, and the first switch Q1 is ready to be turned on. At time t7, the first switch Q1 is turned on, realizing the zero-voltage turn-on of the first switch Q1.

[0104] It is understandable that the set duration is between t2 and t4, and the discharge duration of the first capacitor C1 is between t3 and t4; the duration between t2 and t3 can be determined based on the inductance value of the first inductor L1, the inductance value of the second inductor L2, and the voltage value of the input power supply.

[0105] It is understood that in this embodiment of the application, the switch module 201 is turned on at time t3, so that the second inductor L2 discharges to compensate for the output voltage value of the auxiliary power supply circuit 200, while avoiding the problem that the output voltage value of the auxiliary power supply circuit 200 is too large due to the continuous discharge of the second inductor L2.

[0106] For example, the PFC circuit 100 is a Boost PFC circuit. When the PFC circuit is running, the control switch module is turned on, including: when the PFC circuit is running, obtaining the voltage polarity of the input power supply; if the input power supply enters the positive half-cycle of the voltage, controlling the first switch module to turn on; if the input power supply enters the negative half-cycle of the voltage, controlling the second switch module to turn on.

[0107] Here, controlling the first switch module to turn on includes controlling the seventh and eighth switches to turn on. Controlling the second switch module to turn on includes controlling the ninth and tenth switches to turn on.

[0108] The control switch module is turned off, including: controlling the first switch module and the second switch module to turn off.

[0109] It is understood that, in this embodiment of the application, the on / off states of the first switch Q1, the second switch Q2, the first switch module 2011, and the second switch module 2012 are controlled based on the voltage polarity of the input power supply. If the input power supply enters the positive half-cycle of the voltage, the first switch Q1, acting as the active switch, is turned on, and the seventh switch Q7 and the eighth switch Q8 are also turned on, so that the auxiliary power supply circuit 200 supplies power to the first load; if the input power supply enters the negative half-cycle of the voltage, the second switch Q3, acting as the active switch, is turned on, and the ninth switch Q9 and the tenth switch Q10 are also turned on, so that the auxiliary power supply circuit 200 supplies power to the first load.

[0110] It is understandable that the set duration is less than half the voltage cycle duration of the input power supply.

[0111] It is understandable that after the switch module 201 is turned off, it can control the corresponding switch to turn on when the energy stored in the parasitic capacitance of the switch of the PFC circuit 100 is depleted, based on the detection of the terminal voltage of the switch of the PFC circuit 100 or by setting an appropriate preset time, so as to achieve zero-voltage turn-on of the switch of the PFC circuit 100.

[0112] Based on the power supply device described above, this application embodiment also provides an electronic device, including the aforementioned power supply device and a controller, wherein the controller is used to execute the steps of the aforementioned control method when running a computer program.

[0113] For example, the PFC circuit 100 is a Boost PFC circuit, such as... Figure 8As shown, the power supply device also includes a drive module 400, a thermistor PTC, a first resistor R1, a second resistor R2, a third inductor L3, a fourth capacitor C4, and a fifth capacitor C5. The controller 300 is connected to the drive terminals of the first switch Q1, the fifth switch Q5, and the sixth switch Q6 via the drive module 400 (partial connection relationship not shown in the diagram), and is used to control the on / off states of the first switch Q1, the fifth switch Q5, and the sixth switch Q6. Specifically, the controller 300 is also used to acquire the output voltage value of the rectifier module 101, and control the on / off state of the first switch Q1 based on the output voltage value of the rectifier module 101; and to acquire the voltage value of the auxiliary electrical signal. If it is determined that the voltage value of the auxiliary electrical signal drops to a set voltage threshold, the controller controls the fifth switch Q5 and the sixth switch Q6 to turn on, and after a set time period, controls the fifth switch Q5 and the sixth switch Q6 to turn off.

[0114] Here, the input power is filtered by the fourth capacitor C4, the third inductor L3 and the fifth capacitor C5 before being input to the PFC circuit 100. The thermistor PTC is used to protect the power supply device, and the controller 300 is also used to control the connection status of the thermistor PTC.

[0115] For example, the PFC circuit 100 is a Boost PFC circuit, such as... Figure 9 As shown, the power supply device also includes a drive module 400, a first drive circuit, a second drive circuit, a third inductor L3, and a fourth capacitor C4. The controller 300 is connected to the drive terminal of the first switching transistor Q1 via the drive module 400 and the first drive circuit. The controller 300 is connected to the drive terminal of the second switching transistor Q2 via the drive module 400 and the second drive circuit. The controller 300 is also connected to the drive terminals of the third switching transistor Q3, the fourth switching transistor Q4, the seventh switching transistor Q7, the eighth switching transistor Q8, the ninth switching transistor Q9, and the tenth switching transistor Q10 (not shown in the figure) via the drive module 400. The input power supply is filtered by the fourth capacitor C4 and the third inductor L3 before being input to the PFC circuit 100. The controller 300 is also used to obtain the voltage polarity of the input power supply and, based on the voltage polarity of the input power supply, control the on / off states of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the seventh switching transistor Q7, the eighth switching transistor Q8, the ninth switching transistor Q9, and the tenth switching transistor Q10.

[0116] Here, the first driving circuit consists of the third resistor R3, the fourth resistor R4, and the second diode D2, while the second driving circuit consists of the fifth resistor R5, the sixth resistor R6, and the third diode D3. The second diode D2 and the third diode D3 are Schottky diodes.

[0117] In some embodiments, in addition to the aforementioned PFC circuit 100 and auxiliary power supply circuit 200, the power supply device also includes a controller for performing the steps of the aforementioned control method.

[0118] In one application example of this application, the electronic device is an air conditioner, the input power of the power supply device is the external power supply of the air conditioner, the PFC circuit 100 is used to supply power to high-power loads such as fans, and the auxiliary power supply circuit 200 is used to provide control power to the air conditioner.

[0119] In this application example, the voltage threshold is set to 15V.

[0120] It should be noted that if the auxiliary power supply circuit 200 is used to provide control power for the air conditioner, since the auxiliary power supply circuit 200 only generates auxiliary electrical signals when the PFC circuit 100 is running, the power supply device also includes a flyback switching power supply module, such as... Figure 10 As shown, the flyback switching power supply module includes a Zener diode DZ, an eleventh switching transistor Q11, a transformer T1, a fourth diode D4, and a sixth capacitor C6. The Zener diode DZ and the eleventh switching transistor Q11 are located on the primary side of the transformer T1, which is connected to the input power supply. The fourth diode D4 and the sixth capacitor C6 are located on the secondary side of the transformer T1. The cathode of the fourth diode D4 is connected to a first load, which includes a controller 300. The controller 300 is connected to the drive terminal of the eleventh switching transistor Q11.

[0121] Understandably, after the power supply unit is connected to the input power supply, the flyback switching power supply module is also connected. At this time, since the eleventh switch Q11 is in the off state, an electrical signal is output on the secondary side of the transformer T1. The electrical signal output by the flyback switching power supply module is used to supply power to the controller 300. After the controller 300 is powered on and started, it controls the operation of the PFC circuit 100 and the auxiliary power supply circuit 200. The auxiliary power supply circuit 200 outputs an auxiliary electrical signal to supply power to the first load. The controller 300 controls the eleventh switch Q11 to turn on, and the flyback switching power supply module stops outputting power.

[0122] Understandably, the flyback switching power supply module only outputs power before the PFC circuit 100 and auxiliary power supply circuit 200 are started. After the auxiliary power supply signal 200 is started, the first load is powered by the auxiliary power supply circuit 200, which improves the efficiency of the power supply device.

[0123] In an exemplary embodiment, this application also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory that stores a computer program. The computer program can be executed by the controller 300 to complete the steps described in the method of this application embodiment. The computer-readable storage medium can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a ferromagnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk storage device or a magnetic tape storage device.

[0124] In an exemplary embodiment, this application also provides a computer program product, including a computer program that can be executed by a controller 300 to perform the steps described in the method of this application embodiment.

[0125] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0126] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0127] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply device, characterized in that, The power supply device includes: A power factor correction (PFC) circuit includes a first inductor and at least one switching transistor, the PFC circuit being used to improve the power factor of the input power supply of the power supply device based on the at least one switching transistor. An auxiliary power supply circuit includes a second inductor, which is magnetically coupled to the first inductor. When the PFC circuit is running, the auxiliary power supply circuit generates an auxiliary electrical signal based on the induced electrical energy of the second inductor. The auxiliary power supply circuit also includes a switching module and a first capacitor, wherein the auxiliary electrical signal is used to charge the first capacitor; and the switching module is used to control the energizing state of the second inductor. The second inductor carries current during the turn-on period of the switching module; based on the mutual inductance between the second inductor and the first inductor, the at least one switching transistor is turned on with zero voltage.

2. The power supply device according to claim 1, characterized in that, The auxiliary power supply circuit is connected to the first load, and the second inductor carries current during the turn-on of the switching module, including: During the turn-on period of the switching module, the second inductor discharges to the first capacitor and / or the first load; The first capacitor discharges through the second inductor.

3. The power supply device according to claim 2, characterized in that, The first terminal of the first inductor is connected to the at least one switching transistor, and the PFC circuit further includes: The second capacitor is connected to the second terminal of the first inductor.

4. The power supply device according to claim 3, characterized in that, The PFC circuit is a Boost PFC circuit, the first capacitor is disposed between the first end of the second inductor and the ground end, and the switching module is disposed between the second end of the second inductor and the ground end. Wherein, the first terminal of the first inductor and the first terminal of the second inductor are terminals with the same name.

5. The power supply device according to claim 3, characterized in that, The PFC circuit is a totem pole PFC circuit, and the switching module includes: A first switching module is disposed between the first end of the second inductor and the first end of the first capacitor; The second switching module is disposed between the second end of the second inductor and the first end of the first capacitor; Wherein, the second end of the first capacitor is connected to the ground terminal, the second inductor is provided with an intermediate connection, and the intermediate connection is connected to the ground terminal; the first end of the first inductor and the first end of the second inductor are terminals with the same name.

6. The power supply device according to claim 3, characterized in that, The first capacitor is a polarized capacitor, and the second capacitor is a non-polarized capacitor.

7. A control method for a power supply device as described in any one of claims 1 to 6, characterized in that, The method includes: When the PFC circuit is running, it controls the switching module to turn on, so that the second inductor is energized; After the switch module is turned on for a set time, the switch module is turned off so that the second inductor is no longer energized. During the turn-on period of the switch module, after the second inductor discharges, the first capacitor discharges to the second inductor.

8. The method according to claim 7, characterized in that, The PFC circuit is a Boost PFC circuit. When the PFC circuit is running, it controls the switching module to turn on, including: When the PFC circuit is running, the voltage value of the auxiliary electrical signal is acquired; If the voltage value of the auxiliary electrical signal drops to a set voltage threshold, the switch module is controlled to turn on.

9. The method according to claim 7, characterized in that, The PFC circuit is a totem-pole PFC circuit. The switching module includes a first switching module and a second switching module. The first switching module is disposed between a first terminal of the second inductor and a first terminal of the first capacitor. The second switching module is disposed between a second terminal of the second inductor and a first terminal of the first capacitor. The second terminal of the first capacitor is connected to a ground terminal. The second inductor has an intermediate connection, which is connected to a ground terminal. When the PFC circuit is running, controlling the switching module to turn on includes: When the PFC circuit is running, the voltage polarity of the input power supply is obtained; If the input power supply enters the positive half-cycle of the voltage, the first switching module is controlled to turn on. If the input power supply enters the negative half-cycle of the voltage, the second switching module is turned on.

10. The method according to claim 7, characterized in that, The method further includes: The PFC circuit is controlled to operate based on either the intermittent conduction (DCM) mode or the critical conduction (CRM) mode.

11. An electronic device, characterized in that, The electronic device includes a power supply device as described in any one of claims 1 to 6, and the electronic device further includes a controller, wherein... The controller is configured to execute the steps of the method according to any one of claims 7 to 10 when running a computer program.

12. A storage medium storing a computer program, characterized in that, When the computer program is executed by the controller, it implements the steps of the method according to any one of claims 7 to 10.

13. A computer program product, comprising a computer program, characterized in that, When executed by the controller, the computer program implements the steps of the method according to any one of claims 7 to 10.

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