CN114640240A - Bridgeless power factor correction protection circuit, control method and power module - Google Patents

Bridgeless power factor correction protection circuit, control method and power module Download PDF

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Publication number
CN114640240A
CN114640240A CN202210141433.3A CN202210141433A CN114640240A CN 114640240 A CN114640240 A CN 114640240A CN 202210141433 A CN202210141433 A CN 202210141433A CN 114640240 A CN114640240 A CN 114640240A
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China
Prior art keywords
switch
module
current
protection
factor correction
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CN202210141433.3A
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Chinese (zh)
Inventor
易立琼
胡笑鲁
杨泽洲
陈少娴
滕达
彭嗣翔
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Huawei Digital Power Technologies Co Ltd
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Huawei Digital Power Technologies Co Ltd
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Priority to CN202210141433.3A priority Critical patent/CN114640240A/en
Publication of CN114640240A publication Critical patent/CN114640240A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The embodiment of the application provides a bridgeless power factor correction protection circuit, a control method and a power module. The alternating current power supply module is electrically connected with the power factor correction module and comprises an alternating current power supply and a switch. The switch is connected with the control module, the protection module and the power factor correction module. The alternating current power supply is electrically connected with the switch. The control module is used for collecting the current of the protection module. The control module is configured to open the switch when the current is greater than or equal to the current threshold. By adopting the embodiment of the application, the conduction loss can be reduced, the circuit efficiency can be improved, and the product competitiveness can be improved.

Description

Bridgeless power factor correction protection circuit, control method and power module
Technical Field
The present disclosure relates to the field of electronic circuits, and in particular, to a bridgeless power factor correction protection circuit, a control method thereof, and a power module.
Background
At present, a bridge Power Factor Correction (PFC) circuit has many conducting devices and large on-state loss.
For example, in the conventional bridge power factor correction circuit, two diodes are turned on simultaneously in the uncontrolled rectifier loop, and the voltage drop of each diode when it is turned on is 0.7V, and when the current flowing through the diode is i, the conduction loss of the power factor correction circuit is 2 × 0.7 × i. Therefore, the conventional power factor correction circuit has high conduction loss and low circuit efficiency.
Disclosure of Invention
In view of this, the present application provides a bridgeless power factor correction circuit and a protection method thereof, which can reduce conduction loss, improve circuit efficiency, and improve product competitiveness.
The first aspect of the present application provides a bridgeless power factor correction circuit, which includes a power factor correction module, an ac power supply module, a protection module, and a control module. The alternating current power supply module is electrically connected with the power factor correction module and comprises an alternating current power supply and a switch. The switch is connected with the control module, the protection module and the power factor correction module. The alternating current power supply is electrically connected with the switch. The control module is used for collecting the current of the protection module. The control module is configured to open the switch when the current is greater than or equal to the current threshold.
By adopting the embodiment of the application, whether the switch is disconnected or not can be determined according to the collected current of the protection module, so that the protection of the switch in the bridgeless power factor correction circuit can be realized, the reliability of a product is improved, the efficiency of the circuit can be improved, and the conduction loss is reduced.
In a possible design, the protection module includes a first protection unit and a second protection unit, the first protection unit is electrically connected to the switch and the second protection unit, and the second protection unit is electrically connected to the switch. With such a design, embodiments of the present application can protect the circuit and can prevent damage from surge or lightning current.
In one possible design, the protection module includes a first diode and a second diode, a cathode of the first diode is electrically connected to the switch, an anode of the first diode is electrically connected to a cathode of the second diode, and an anode of the second diode is electrically connected to the switch. With such a design, embodiments of the present application can protect the circuit and can prevent damage from surge or lightning current.
In one possible design, the protection module further includes a current sampling unit electrically connected to the power factor correction module, the first protection unit, and the second protection unit; the current sampling unit is used for collecting the current of the protection module. Based on such design, this application embodiment can detect whether take place thunderbolt surge current through protection module, can protect the switch.
In one possible design, the current sampling unit comprises a resistor or a current transformer. Therefore, the current sampling unit can feed back the current of the protection module to the control module in real time to protect the circuit in real time.
In one possible design, the switch is any one or combination of an insulated gate bipolar transistor IGBT, a metal oxide semiconductor field effect transistor MOSFET, gallium nitride GaN, and silicon carbide SiC.
The second aspect of the present application further provides a control method for a bridgeless power factor correction protection circuit, which is applied to the bridgeless power factor correction protection circuit, where the bridgeless power factor correction protection circuit includes an ac power supply module, a protection module, and a control module, the ac power supply module includes a switch, and the method includes: collecting the current of the protection module, and transmitting the collected current to a control module; determining whether the current is greater than or equal to a current threshold; the control module turns off the switch when the current is greater than or equal to a current threshold. The embodiment of the application can determine whether to disconnect the switch according to the collected current of the protection module, so that the protection of the switch in the bridgeless power factor correction circuit can be realized, the reliability of a product is improved, the efficiency of the circuit can be improved, and the conduction loss is reduced.
In one possible design, the control module turns on the switch when the current is less than a current threshold.
In one possible design, the switch is any one or combination of an insulated gate bipolar transistor IGBT, a metal oxide semiconductor field effect transistor MOSFET, gallium nitride GaN, and silicon carbide SiC.
The third aspect of the present application also provides a power module including the bridgeless power factor correction protection circuit described above.
The bridgeless power factor correction protection circuit, the control method thereof and the power module provided by the embodiment of the application can realize the protection of the switch in the bridgeless power factor correction circuit, improve the reliability of a product, and also can improve the efficiency of the circuit and reduce the conduction loss.
Drawings
Fig. 1 is a schematic diagram of a bridgeless power factor correction circuit.
Fig. 2 is a schematic structural diagram of a bridgeless power factor correction protection circuit according to an embodiment of the present application.
Fig. 3 is another schematic structural diagram of the bridgeless power factor correction protection circuit according to the embodiment of the present application.
Fig. 4 is a first current flow diagram of a bridgeless power factor correction protection circuit provided in an embodiment of the present application.
Fig. 5 is a second current flow diagram of a bridgeless power factor correction protection circuit provided in accordance with an embodiment of the present application.
Fig. 6 is a third current flow diagram of a bridgeless power factor correction protection circuit provided according to an embodiment of the present application.
Fig. 7 is a waveform diagram of a bridgeless power factor correction protection circuit according to an embodiment of the present application.
Fig. 8 is a flowchart of a control method of a bridgeless power factor correction protection circuit according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a power module according to an embodiment of the present application.
Detailed Description
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, 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 in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In general, a bridge Power Factor Correction (PFC) circuit has a large conduction loss and a low circuit efficiency.
Under some possible scenarios, the bridgeless PFC circuit may reduce on-state losses and may improve the efficiency of the circuit. For example, as shown in fig. 1, a bridgeless PFC circuit may include an ac power module 101, a power module 102, and a control module 103. Wherein the ac power module 101 is connected to the power module 102 and provides power to the power module 102, and the power module 102 may further include switches S11-S14, and the control module 103 samples the current of the switches S11-S14 in the power module 102 and turns off the switching element through which the negative current flows. In the bridgeless PFC circuit shown in fig. 1, the low-frequency switching device may employ a diode, the high-frequency tubes employ switching tubes, and each switching tube has a separate current sampling circuit. The bridgeless PFC circuit adopts the diode D1 and the diode D2 for switching, compared with a lower-loss switching tube, the diode has the characteristic of high breakdown voltage and reverse natural turn-off, and the circuit can be effectively protected from being damaged by surge or lightning current. In the bridgeless PFC circuit in the scene, because each high-frequency tube is provided with an independent sampling circuit for current sampling, the structure of the control module is complex, the cost is high, the product has no cost advantage, and the competitiveness of the product can be reduced.
In another possible scenario, in order to further improve the efficiency of the bridgeless PFC circuit, the diode D1 and the diode D2 shown in fig. 1 may be replaced by two switching tubes, and since the switching tubes have lower conduction voltage drop than the diodes, the conduction loss may be further reduced compared to the bridgeless PFC circuit shown in fig. 1. However, in this scenario, when there is a surge or lightning current, since the switching tube cannot be turned off naturally as the diode, there is a risk that the bus energy will be back-pumped into the source through the middle and low frequency tube. Therefore, how to perform quick-break protection on the low-frequency switch tube is an urgent problem to be solved.
In view of the above problems in the above scenario, embodiments of the present application provide a bridgeless power factor correction protection circuit, a control method, and a power module, which can reduce conduction loss and improve circuit efficiency, and can also perform quick-break protection on a low-frequency switching tube in the bridgeless power factor correction circuit, thereby improving reliability of a product and competitiveness of the product.
Referring to fig. 2, fig. 2 is a schematic diagram of a bridgeless pfc protection circuit 100 according to an embodiment of the present disclosure.
In this embodiment, the bridgeless power factor correction protection circuit 100 may include an ac power supply module 10, a PFC module 20, a control module 30, and a protection module 40. The ac power module 10 is electrically connected to the PFC module 20 to provide power for the PFC module 20. The control module 30 is electrically connected to the PFC module 20, and the protection module 40 is electrically connected to the ac power supply module 10 and the control module 30.
It is understood that, in the present embodiment, the ac power module 10 may include an ac power source 12 and a switch module 14. The switch module 14 may include a pair of first switches, which may include, in particular, a switch Q1 and a switch Q2.
The third terminal of the switch Q1 may be connected to the control module 30, for example, the control module 30 may be signally connected to the switch Q1. A second terminal of the switch Q1 may be electrically connected to the PFC module 20 and the protection module 40. A first terminal of the switch Q1 may be electrically connected to a first terminal of the ac power source 12. The third terminal of the switch Q1 can be used as the control terminal of the switch Q1. That is, the control module 30 may output a signal to the third terminal of the switch Q1, and may control the state of the switch Q1, for example, the control module 30 may control the switch Q1 to be turned on or off.
The third terminal of the switch Q2 may be electrically connected to the control module 30, for example, the control module 30 may be in signal connection with the switch Q2. A second terminal of the switch Q2 may be electrically connected to the PFC module 20 and the protection module 40. A first terminal of the switch Q2 may be electrically connected to a first terminal of the ac power source 12. The third terminal of the switch Q2 may be used as the control terminal of the switching element Q2. That is, the control module 30 may output a signal to the third terminal of the switch Q2 to control the state of the switch Q2, for example, the control module 30 may control the switch Q2 to be turned on or off.
It is understood that, in one possible implementation, the switch Q1 and the switch Q2 may be any one or a combination of Metal-Oxide-Semiconductor Field Effect transistors (MOS), Insulated Gate Bipolar Transistors (IGBT), gallium nitride (GaN), silicon carbide (SiC), and other Semiconductor switching devices. It is understood that in this embodiment, since the turn-on voltage of the insulated gate device (for example, a MOS transistor) is low, the turn-on loss can be further reduced compared to that of a diode. Therefore, the bridgeless power factor correction circuit is smaller in loss and higher in efficiency, and competitiveness of products can be improved.
In this embodiment, the protection module 40 may be used to protect a circuit from damage due to surge or lightning strike currents. Specifically, the protection module 40 may be electrically connected to both ends of the switch module 14, that is, the protection module 40 may be electrically connected to the second end of the switch Q1 and the second end of the switch Q2. The protection module 40 may include a current collection unit 46, a protection unit 42, and a protection unit 44. A first end of the protection unit 42 may be electrically connected to the second end of the switch Q1, a second end of the protection unit 42 may be electrically connected to a first end of the protection unit 44, and a second end of the protection unit 44 may be electrically connected to the second end of the switch Q2. The current collection unit 46 may be electrically connected to a node between the protection units 42 and 44 and a second end of the ac power source 12. It is understood that the current collection unit 46 may also be electrically connected to the control module 30. It is understood that the protection unit 42 and the protection unit 44 in this embodiment can be used to protect a circuit from damage due to surge or lightning strike currents. The current collecting unit 46 may collect the current of the protection module 40. For example, the current collecting unit 46 may collect the current of the branch in which the protection unit 42 and the protection unit 44 are located, and feed back the collected current to the control module 30. Therefore, the control module 30 according to the embodiment of the present application can control the state of the switch module 14 according to the collected current, so as to improve the protection capability of the switch in the switch module 14.
It is understood that in one embodiment, the current sampling unit 46 may include any one of a resistor, a CT current transformer, and a hall transformer.
It is understood that the PFC module 20 may include one or more interleaving PFC circuits. As shown in fig. 2, the one-way interleaved PFC circuit may include an inductor L1, a pair of second switching elements, and a capacitor C1. Specifically, the pair of second switches may include a switch Q3 and a switch Q4. A first terminal of the inductor L1 may be electrically connected to the second terminal of the ac power source 12, and a second terminal of the inductor L1 may be electrically connected to the first terminal of the switch Q3 and the first terminal of the switch Q4. The third terminal of the switch Q3 may be connected to the control module 30, for example, the third terminal of the switch Q3 may be connected to the control module 30 by a signal, and the second terminal of the switch Q3 may be electrically connected to the second terminal of the switch Q1 and the first terminal of the protection unit 42. The third terminal of the switch Q3 may be used as the control terminal of the switch Q3, and the control module 30 may output a signal to the third terminal of the switch Q3 to control the state of the switch Q3, for example, the control module 30 may control the switch Q3 to be turned on or off. The third terminal of the switch Q4 may be connected to the control module 30, for example, the third terminal of the switch Q4 may be connected to the control module 30 by a signal, and the second terminal of the switch Q4 may be electrically connected to the second terminal of the switch Q2 and the second terminal of the protection unit 44. The third terminal of the switch Q4 may be used as the control terminal of the switch Q4, that is, the control module 30 may output a signal to the third terminal of the switch Q4 to control the state of the switch Q4, for example, the control module 30 may control the switch Q4 to be turned on or turned off.
It is understood that another interleaved PFC circuit may include an inductor L2, a pair of third switches, and a capacitor C1. Specifically, the pair of third switches may include a switch Q5 and a switch Q6. A first terminal of the inductor L2 may be electrically connected to the second terminal of the ac power source 12, and a second terminal of the inductor L2 may be electrically connected to the first terminal of the switch Q5 and the first terminal of the switch Q6. The third terminal of the switch Q5 may be connected to the control module 30, for example, the third terminal of the switch Q5 may be connected to the control module 30 by a signal, and the second terminal of the switch Q5 may be electrically connected to the second terminal of the switch Q1 and the first terminal of the protection unit 42. The third terminal of the switch Q5 may be used as the control terminal of the switch Q5, that is, the control module 30 may output a signal to the third terminal of the switch Q5 to control the state of the switch Q5, for example, the control module 30 may control the switch Q5 to be turned on or off. The third terminal of the switch Q6 may be connected to the control module 30, for example, the third terminal of the switch Q6 may be connected to the control module 30 by a signal, and the second terminal of the switch Q6 may be electrically connected to the second terminal of the switch Q2 and the second terminal of the protection unit 44. The third terminal of the switch Q6 may be used as the control terminal of the switch Q6, that is, the control module 30 may output a signal to the third terminal of the switch Q6 to control the state of the switch Q6, for example, the control module 30 may control the switch Q6 to be turned on or off. It is understood that, in one possible implementation, the switch Q3, the switch Q4, the switch Q5 and the switch Q6 may be insulated gate devices, such as MOS transistors or IGBTs, which is not limited in this application.
Referring to fig. 3, fig. 3 is a schematic diagram of a bridgeless power factor correction protection circuit 100 according to another embodiment of the present application.
The difference from the bridgeless power factor correction protection circuit 100 shown in the embodiment of fig. 2 is that, as shown in fig. 3, in the present embodiment, the protection unit 42 may include a diode D1, and the protection unit 44 may include a diode D2. It is understood that in this embodiment, the control module 30 may include a controller, for example, the control module 30 may include a controller 32. The controller 32 may be a Triangular Current Mode (TCM) controller.
In one implementation, the controller 32 may be composed of discrete components or a logic device, for example, the controller 32 may be a Complex Programmable Logic Device (CPLD) or a Field Programmable Gate Array (FPGA).
In this embodiment, a cathode of the diode D1 may be electrically connected to the second terminal of the switch Q1 and the second terminal of the switching element Q3, an anode of the diode D1 may be electrically connected to the current sampling unit 46 and the cathode of the diode D2, and an anode of the diode D2 may be electrically connected to the second terminal of the switch Q2 and the second terminal of the switch Q4.
It can be understood that the diode D1 and the diode D2 may have characteristics of high breakdown voltage and reverse natural turn-off, so that the embodiment of the present application may effectively protect the circuit from the surge or lightning strike current through the diode D1 and the diode D2.
The following will specifically explain the implementation principle of the bridgeless power factor correction protection circuit 100 according to the embodiment of the present application. As shown in fig. 4 to fig. 6, the implementation principle of the bridgeless pfc protection circuit 100 is described by taking the positive half cycle of the ac input and the bridge arm connected by the inductor L1 as an example.
During the positive half cycle (e.g., positive left and negative right) of the ac input, the normal power loop is shown in fig. 4, i.e., the bridgeless pfc protection circuit 100 is in normal operation. Wherein a current loop may pass through the switch Q1, the switch Q3, the inductor L1, and the ac power source 12 in sequence. At this time, no current flows through the diode D1 and the diode D2. In one scenario, if a lightning strike voltage is applied to the ac power source 12, if the switch Q1 is kept in the on state all the time, all the lightning strike voltage will be applied to the current sampling unit 46, the diode D1 and the switch Q1, which may cause the switch Q1 to fail. It will be appreciated that when the lightning strike voltage is coming, if the transmission path of the lightning strike energy coincides with the conduction path of the PFC circuit, the lightning strike energy can be absorbed by the bus capacitor (e.g., capacitor C1), which can protect the switch Q1.
It will be appreciated that when a lightning strike occurs, if the lightning strike current is flowing in the opposite direction to the output current of the ac power source 12, as shown in fig. 5, the circuit of the lightning strike current may pass through the current sampling unit 46, the diode D1, the switch Q1, and the ac power source 12 in sequence. Therefore, the current sampling unit 46 may collect the current flowing through the branch, and the control module 30 may obtain the current information obtained by the current sampling unit 46 in real time, and determine whether to turn off the switch Q1 according to the current information, so as to protect the switch Q1. For example, the control module 30 may compare the absolute value of the collected branch current with a current threshold IthA comparison is made. The control module 30 may compare the current magnitude I1 collected by the current collecting unit 46 with a current threshold IthA comparison is made. For example, if the current collected by the current collecting unit 46 is-10 amperes, the current threshold IthAt 8 amps, the current level I1 is 10A, and thus, the control module 30 may determine that the current level I1 is greater than the current threshold Ith. If the current collected by the current collecting unit 46 is-6 amperes, the current threshold value IthAt 8 amps, the current level I1 is 6A, and thus, the control module 30 may determine that the current level I1 is less than the current threshold Ith. If the current collected by the current collecting unit 46 is 10 amperes, the current threshold I is setthAt 8 amps, the current level I1 is 10A, and thus, the control module 30 may determine that the current level I1 is greater than the current threshold Ith. If the branch current I1 is greater than or equal to the circuit threshold IthThe control module 30 outputs a signal to the third terminal of the switch Q1 to turn off the switch Q1, thereby protecting the switch Q1.
As shown in fig. 6, when the switch Q1 is turned off, the lightning strike current may pass through the current collecting unit 46, the diode D1, the capacitor C1 and the switch Q2 in sequence, so that the lightning strike current may be absorbed by a bus capacitor (e.g., the capacitor C1), thereby reducing stress of the low frequency switching tube and improving reliability thereof.
Fig. 7 shows a square waveform S1 as the original driving waveform of the switch Q1, a square waveform S2 as the driving waveform of the switch Q1 when a lightning strike occurs, and a triangular waveform S3 as the current waveform sampled by the current sampling unit 46.
As can be seen from fig. 7, under normal conditions, the driving waveform of the switch Q1 is shown as a square waveform S1, when a lightning stroke is detected, a sealing wave is driven, the driving waveform of the switch Q1 is shown as a square waveform S2, the lightning stroke occurs at time t1, the energy of the lightning stroke will be reversely recharged to the ac power supply 12, at this time, the protection module 40 starts to operate, and the current waveform sampled by the current sampling unit 46 is shown as a triangular waveform S3. When the lightning current reaches the current threshold IthWill trigger the protection logic of the switching elementThat is, the control module 30 will output a signal to the switch Q1 to turn off the switch Q1. When the lightning strike current flows to the body diode of the switch Q2, the lightning strike energy can be absorbed by the bus capacitor, and the switch Q1 can be protected.
Based on the above embodiments, the bridgeless power factor correction protection circuit of the embodiments of the present application can realize protection of a low frequency switching element in a PFC circuit, and improve reliability of a product. The embodiment of the application can also improve the efficiency of the circuit and reduce the conduction loss.
Referring to fig. 8, fig. 8 is a flowchart illustrating a control method of a bridgeless pfc protection circuit according to an embodiment of the present disclosure. The control method of the bridgeless power factor correction protection circuit can be applied to the bridgeless power factor correction protection circuit 100, and comprises the following steps:
step S81: and collecting the current of the protection module.
Taking the bridgeless power factor correction protection circuit 100 shown in fig. 3 as an example, the current sampling unit 46 may collect the current of the protection module 40 and feed the detected current back to the controller 32.
For example, when a lightning strike voltage is generated, an inrush current may pass through the protection module 40, and the controller 32 may obtain a current value of the inrush current through the current detection unit 46.
Step S82: determining whether a current magnitude of the protection module is greater than or equal to a current threshold.
The controller 32 can compare the current magnitude I1 collected by the current collecting unit 46 with a current threshold IthA comparison is made. For example, if the current collected by the current collecting unit 46 is-10 amperes, the current threshold I is setthAt 8 amps, the current level I1 is 10A, and thus, the controller 32 may determine that the current level I1 is greater than the current threshold Ith. If the current collected by the current collecting unit 46 is-6 amperes, the current threshold value IthAt 8 amps, the current level I1 is 6A, and thus, the controller 32 may determine thatThe current magnitude I1 is less than the current threshold value Ith. If the current collected by the current collecting unit 46 is 10 amperes, the current threshold I is setthAt 8 amps, the current level I1 is 10A, and thus, the controller 32 may determine that the current level I1 is greater than the current threshold Ith。
Step S83: and if the current flowing through the protection module is larger than or equal to the current threshold, the switch is controlled to be switched off.
In this embodiment, if the current I1 flowing through the protection module is greater than or equal to the circuit threshold IthThe controller 32 will output a signal to the third terminal of the switch Q1 to turn off the switch Q1, thereby protecting the switch Q1.
In this embodiment, when the switch Q1 is turned off, the lightning strike current may sequentially pass through the current collecting unit 46, the diode D1, the capacitor C1, and the switch Q2, so that the lightning strike current may be absorbed by a bus capacitor (such as the capacitor C1), and thus, the stress of the low-frequency switching tube may be reduced, and the reliability of the low-frequency switching tube may be improved.
Referring to fig. 9, an embodiment of the present application further provides a power module 200. The power module 200 may include the bridgeless power factor correction circuit 100 described in the above embodiments.
Based on the design, the current sampling unit is arranged in the branch of the protection module, and the state of the low-frequency switch is controlled according to the current of the branch of the protection module, so that the reliability of circuit topology is improved, and the product competitiveness is improved. The control method of the bridgeless power factor correction protection circuit can achieve protection of a low-frequency switch in a PFC circuit and improve reliability of products. The embodiment of the application can also improve the efficiency of the circuit and reduce the conduction loss.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.

Claims (10)

1. A bridgeless power factor correction protection circuit is characterized by comprising a power factor correction module, an alternating current power supply module, a protection module and a control module;
the alternating current power supply module is electrically connected with the power factor correction module and comprises an alternating current power supply and a switch;
the switch is connected with the control module, the protection module and the power factor correction module; the alternating current power supply is electrically connected with the switch;
the control module is used for collecting the current of the protection module; the control module is configured to open the switch when the current is greater than or equal to a current threshold.
2. The bridgeless power factor correction protection circuit of claim 1,
the protection module comprises a first protection unit and a second protection unit, wherein the first protection unit is electrically connected with the switch and the second protection unit, and the second protection unit is electrically connected with the switch.
3. The bridgeless power factor correction protection circuit of claim 1 or 2,
the protection module comprises a first diode and a second diode, wherein the cathode of the first diode is electrically connected to the switch, the anode of the first diode is electrically connected to the cathode of the second diode, and the anode of the second diode is electrically connected to the switch.
4. The bridgeless power factor correction protection circuit of claim 2,
the protection module further comprises a current sampling unit which is electrically connected with the power factor correction module, the first protection unit and the second protection unit;
the current sampling unit is used for collecting the current of the protection module.
5. The bridgeless power factor correction protection circuit of claim 4,
the current sampling unit comprises a resistor or a current transformer.
6. The bridgeless power factor correction protection circuit of any of claims 1-5,
the switch is any one or combination of an insulated gate bipolar transistor IGBT, a metal oxide semiconductor field effect transistor MOSFET, gallium nitride GaN and silicon carbide SiC.
7. A control method of a bridgeless power factor correction protection circuit is applied to the bridgeless power factor correction protection circuit, the bridgeless power factor correction protection circuit comprises an alternating current power supply module, a protection module and a control module, the alternating current power supply module comprises a switch, and the method is characterized by comprising the following steps:
collecting the current of the protection module, and transmitting the collected current to a control module;
determining whether the current is greater than or equal to a current threshold;
the control module turns off the switch when the current is greater than or equal to a current threshold.
8. The bridgeless power factor correction protection circuit control method of claim 7,
when the current is less than a current threshold, the control module turns on the switch.
9. The bridgeless power factor correction protection circuit control method of claim 7,
the switch is any one or combination of an insulated gate bipolar transistor IGBT, a metal oxide semiconductor field effect transistor MOSFET, gallium nitride GaN and silicon carbide SiC.
10. A power module comprising the bridgeless power factor correction protection circuit of any of claims 1-6.
CN202210141433.3A 2022-02-16 2022-02-16 Bridgeless power factor correction protection circuit, control method and power module Pending CN114640240A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023185189A1 (en) * 2022-04-02 2023-10-05 华为数字能源技术有限公司 Power control circuit and control method therefor
WO2024066988A1 (en) * 2022-09-30 2024-04-04 中兴通讯股份有限公司 Lightning strike protection circuit and protection method for power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023185189A1 (en) * 2022-04-02 2023-10-05 华为数字能源技术有限公司 Power control circuit and control method therefor
WO2024066988A1 (en) * 2022-09-30 2024-04-04 中兴通讯股份有限公司 Lightning strike protection circuit and protection method for power supply

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