Totem pole PFC circuit, circuit board, controller and air conditioner

Abstract

The utility model discloses a totem pole PFC circuit, circuit board, controller and air conditioner, including first control bridge arm, follow current bridge arm and first inductor, the first control bridge arm includes first switch tube and second switch tube that connect in series, first switch tube and second switch tube adopt IGBT, the two ends of first switch tube are antiparallel with first diode, and the two ends of second switch tube are antiparallel with second diode. Two ends of the second switch tube are reversely connected in parallel with a second diode; the follow current bridge arm comprises a third diode and a fourth diode which are connected in series, and the connection point of the third diode and the fourth diode is connected to one end of the AC power supply; one end of the first inductor is connected to the other end of the AC power supply, and the other end of the first inductor is connected to a connection point of the first switch tube and the second switch tube; under a preset test condition, reverse recovery characteristic parameters of the first diode and the second diode are smaller than a preset value, and the preset value is determined according to test parameters in the preset test condition; and the reliability of the totem-pole PFC circuit in practical application can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning circuits, and in particular to a totem pole PFC circuit, a circuit board, a controller and an air conditioner. Background Art

[0002] Existing totem pole PFC circuits generally use MOS tubes or SicMOS tubes as switch tubes. Since the price of MOS tubes or SicMOS tubes of the same power specification is generally more than 3 times more expensive than IGBT, the use of MOS tubes or SicMOS tubes has the disadvantage of being expensive; in addition, since the on-resistance of MOSFET is lower than that of IGBT, in the case of short circuit, the current of MOSFET becomes very large instantly, which may cause damage to the device, resulting in poor short-circuit resistance of the PFC circuit.

[0003] At present, the totem pole PFC circuit in the related art often mentions that IGBT can be used as the switch tube, but it often cannot solve the reliability problem in practical application. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a totem pole PFC circuit, a circuit board, a controller and an air conditioner, which can effectively improve reliability.

[0005] In a first aspect, an embodiment of the utility model provides a totem pole PFC circuit, comprising a first control bridge arm, a freewheeling bridge arm and a first inductor, wherein:

[0006] The first control bridge arm comprises a first switch tube and a second switch tube connected in series, the first switch tube and the second switch tube are IGBTs, two ends of the first switch tube are anti-parallel connected with a first diode, and two ends of the second switch tube are anti-parallel connected with a second diode;

[0007] The freewheeling bridge arm is connected in parallel with the first control bridge arm, the freewheeling bridge arm comprises a third diode and a fourth diode connected in series, and a connection point between the third diode and the fourth diode is connected to one end of an AC power supply;

[0008] One end of the first inductor is connected to the other end of the AC power supply, and the other end of the first inductor is connected to the connection point of the first switch tube and the second switch tube;

[0009] Wherein: under preset test conditions, the reverse recovery characteristic parameters of the first diode and the second diode are less than preset values, and the preset values ​​are determined according to the test parameters in the preset test conditions.

[0010] The totem pole PFC circuit provided by the embodiment of the utility model has at least the following beneficial effects: by selecting IGBTs for the two switch tubes of the first control bridge arm, the circuit cost is greatly reduced compared with selecting MOS tubes, the two IGBT devices of the first control bridge arm are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in practical applications.

[0011] According to the totem pole PFC circuit provided by some embodiments of the present invention, the reverse recovery characteristic parameter is a reverse recovery current, and the preset value is a forward current in the preset test condition.

[0012] According to the totem pole PFC circuit provided by some embodiments of the present invention, the preset test conditions include: the reverse test voltage is 400V, the forward current is 15A, the current change rate is 200A / μS, and the test temperature is 25°C; the reverse recovery characteristic parameter is the reverse recovery current, and the preset value is 15A.

[0013] According to the totem pole PFC circuit provided by some embodiments of the present invention, the preset test conditions include: the reverse test voltage is 400V, the forward current is 15A, the current change rate is 200A / μS, and the test temperature is 25°C; the reverse recovery characteristic parameter is the reverse recovery charge, and the preset value is 2μC.

[0014] According to some embodiments of the utility model, the totem pole PFC circuit provided also includes a second inductor and a second control bridge arm connected in parallel with the first control bridge arm, the second control bridge arm includes a third switch tube and a fourth switch tube connected in series, the third switch tube and the fourth switch tube use IGBT, a fifth diode is connected in anti-parallel at both ends of the third switch tube, and a sixth diode is connected in anti-parallel at both ends of the fourth switch tube; one end of the second inductor is connected to the other end of the AC power supply, and the other end of the second inductor is connected to the connection point of the third switch tube and the fourth switch tube.

[0015] According to the totem pole PFC circuit provided by some embodiments of the present invention, the freewheeling bridge arm further includes a seventh diode and an eighth diode connected in series, and a connection point between the seventh diode and the eighth diode is connected to one end of an AC power supply.

[0016] According to the totem pole PFC circuit provided by some embodiments of the present invention, the third diode, the fourth diode, the seventh diode and the eighth diode constitute a rectifier bridge stack.

[0017] In a second aspect, an embodiment of the utility model provides a circuit board, comprising the totem pole PFC circuit as described in the embodiment of the first aspect above.

[0018] The circuit board provided by the embodiment of the utility model has at least the following beneficial effects: by selecting IGBTs for the two switch tubes of the first control bridge arm of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, the two IGBT devices of the first control bridge arm are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in actual application.

[0019] In a third aspect, an embodiment of the utility model provides a controller, comprising the circuit board as described in the embodiment of the second aspect above.

[0020] The controller provided by the embodiment of the utility model has at least the following beneficial effects: by selecting IGBTs for the two switch tubes of the first control bridge arm of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, the two IGBT devices of the first control bridge arm are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in practical applications.

[0021] In a fourth aspect, an embodiment of the utility model provides an air conditioner, comprising the circuit board as described in the embodiment of the second aspect above, or comprising the controller as described in the embodiment of the third aspect above.

[0022] The air conditioner provided by the embodiment of the utility model has at least the following beneficial effects: by selecting IGBTs for the two switch tubes of the first control bridge arm of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, the two IGBT devices of the first control bridge arm are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in actual application.

[0023] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0026] Figure 1 It is a circuit schematic diagram of a totem pole PFC circuit provided in Embodiment 1 of the present utility model;

[0027] Figure 2 It is a circuit schematic diagram of a totem pole PFC circuit provided in Embodiment 2 of the present utility model;

[0028] Figure 3 This is a circuit schematic diagram of a totem pole PFC circuit provided in Embodiment 3 of the present utility model. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0030] In the description of the embodiments of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] It should be noted that the words such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0032] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Existing totem pole PFC circuits generally use MOS tubes or SicMOS tubes as switch tubes. Since the price of MOS tubes or SicMOS tubes of the same power specification is generally more than 3 times more expensive than IGBT, the use of MOS tubes or SicMOS tubes has the disadvantage of being expensive; in addition, since the on-resistance of MOSFET is lower than that of IGBT, in the case of a short circuit, the current of MOSFET becomes very large instantly, which may cause damage to the device, resulting in poor short-circuit resistance of the PFC circuit. At present, the totem pole PFC circuit in the relevant technology often mentions that IGBT can be used as a switch tube, but it often cannot solve the reliability problem in actual application. Based on this, the embodiment of the utility model provides a totem pole PFC circuit, a circuit board, a controller and an air conditioner, which can effectively improve the reliability of the totem pole PFC circuit in actual application.

[0034] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0035] Reference Figure 1 The first embodiment of the utility model provides a totem pole PFC circuit, including a first inductor L1, a first control bridge arm 100, a freewheeling bridge arm 200, an output capacitor and a sampling resistor Rs, wherein:

[0036] The first control bridge arm 100 includes a first switch tube Q1 and a second switch tube Q2 connected in series. The first switch tube Q1 and the second switch tube Q2 are IGBTs. A first diode D1 is anti-parallel connected at both ends of the first switch tube Q1. A second diode D2 is anti-parallel connected at both ends of the second switch tube Q2.

[0037] The freewheeling bridge arm 200 is connected in parallel with the first control bridge arm 100, and the freewheeling bridge arm 200 includes a third diode D3 and a fourth diode D4 connected in series;

[0038] One end of the AC power source AC is connected to a connection point of the third diode D3 and the fourth diode D4, the other end of the AC power source AC is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to a connection point of the first switch tube Q1 and the second switch tube Q2; specifically, one end of the AC power source AC is connected to the anode of the third diode D3 and the cathode of the fourth diode D4, the cathode of the third diode D3 is connected to a switch pin of the first switch tube Q1 to form an output anode and connected to one end of the first capacitor C1, the anode of the fourth diode D4 is connected to a switch pin of the second switch tube Q2 and connected to one end of the sampling resistor Rs, the other end of the sampling resistor Rs is connected to the other end of the first capacitor C1 to form an output cathode; in addition, Figure 1 The resistor RL shown represents a load equivalent resistance, and the resistor RL is connected in parallel with the first capacitor C1;

[0039] Wherein: under the preset test conditions, the reverse recovery characteristic parameters of the first diode D1 and the second diode D2 are less than the preset values, and the preset values ​​are determined according to the test parameters in the preset test conditions.

[0040] According to the totem pole PFC circuit provided by the embodiment of the utility model, by selecting IGBTs for the two switching tubes of the first control bridge arm 100, the circuit cost is greatly reduced compared with selecting MOS tubes, and the two IGBT devices of the first control bridge arm 100 are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switching tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switching tube device more consistent with the reliable operation margin value of the wafer, thereby effectively improving the reliability of the totem pole PFC circuit in actual application.

[0041] In the totem pole PFC circuit provided in some embodiments of the present invention, the reverse recovery characteristic parameter is the reverse recovery current I RM , the preset value is the forward current I in the preset test condition F , that is, the reverse recovery current I of the first diode D1 and the second diode D2 RM Less than the forward current I in the preset test condition F .

[0042] It should be noted that whenever the power diode is turned off, the current will flow from the forward current I F decays to zero, and continues to conduct in the reverse direction due to the charges stored in the space charge region and the semiconductor region, through the forward current I based on the preset test conditions F To limit the selection of the first diode D1 and the second diode D2, so that the reverse recovery current IRM Lower, thus reducing the diode reverse recovery current I during IGBT turn-on RM The resulting opening loss.

[0043] In the totem pole PFC circuit provided in some embodiments of the present invention, the preset test conditions include: the reverse test voltage is 400V, the forward current is 15A, the current change rate is 200A / μS, and the test temperature is 25°C; the reverse recovery characteristic parameter is the reverse recovery current, and the preset value is 15A.

[0044] It should be noted that under the preset test conditions, the turn-on loss P caused by the diode reverse recovery current is loss1 It can be calculated as: Among them, U out is the output voltage of the totem pole PFC circuit, U out =400V; t r is the reverse recovery time, t r =400*10 -9 s; f is the switching frequency of the totem pole PFC circuit, f = 20000Hz; In addition, the switching loss P in the totem pole PFC circuit itself loss2 for:

[0045] Among them, U out is the output voltage of the totem pole PFC circuit, U out =400V; I out is the current through the diode, I out =15A; t r is the reverse recovery time, t r =400*10 -9 s; f is the switching frequency of the totem pole PFC circuit, f = 20000Hz; t f is the forward recovery time, t f =400*10 -9 s; Therefore, the total loss of the switch tube in the totem pole PFC circuit reaches 24W. The IGBT wafer to its heat sink is generally 1.2W / ℃. When the device heat sink temperature reaches 90℃, its core temperature will reach 118.8℃, which is consistent with the wafer reliable operation margin value of 150*0.8=120 degrees. Therefore, the low reverse recovery current I RM After the first diode D1 and the second diode D2 are connected, the operating reliability of the device is effectively guaranteed.

[0046] In the totem pole PFC circuit provided in some embodiments of the present invention, the preset test conditions of the totem pole PFC circuit include: the reverse test voltage is 400V, the forward current is 15A, the current change rate is 200A / μS, and the test temperature is 25°C; the reverse recovery characteristic parameter is the reverse recovery charge, and the preset value is 2μC.

[0047] Similarly, under the preset test conditions, the turn-on loss P caused by the reverse recovery charge of the diode loss1 It can be calculated as: Among them, Q rr is the reverse recovery charge, Q rr =2*10 - 6 C; U out is the output voltage of the totem pole PFC circuit, U out =400V; f is the switching frequency of the totem pole PFC circuit, f = 20000Hz; In addition, the switching loss P in the totem pole PFC circuit itself loss2 for:

[0048] Among them, U out is the output voltage of the totem pole PFC circuit, U out =400V; I out is the current through the diode, I out =15A; t r is the reverse recovery time, t r =400*10 -9 s; f is the switching frequency of the totem pole PFC circuit, f = 20000Hz; t f is the forward recovery time, t f =400*10 -9 s; Therefore, the total loss of the switch tube in the totem pole PFC circuit reaches 24W. The IGBT wafer to its heat sink is generally 1.2W / ℃. When the device heat sink temperature reaches 90℃, its core temperature will reach 118.8℃, which is consistent with the wafer reliable operation margin value of 150*0.8=120 degrees. Therefore, the low reverse recovery charge Q rr After the first diode D1 and the second diode D2 are connected, the operating reliability of the device is effectively guaranteed.

[0049] Reference Figure 2In the totem pole PFC circuit provided in some embodiments of the utility model, a second inductor L2 and a second control bridge arm 300 connected in parallel with the first control bridge arm 100 are also included. The second control bridge arm 300 includes a third switch tube Q3 and a fourth switch tube Q4 connected in series. The third switch tube Q3 and the fourth switch tube Q4 use IGBTs. A fifth diode D5 is connected in anti-parallel to both ends of the third switch tube Q3, and a sixth diode D6 is connected in anti-parallel to both ends of the fourth switch tube Q4. One end of the second inductor L2 is connected to the other end of the AC power supply AC, and the other end of the second inductor L2 is connected to the connection point of the third switch tube Q3 and the fourth switch tube Q4.

[0050] It should be noted that when the input power is greater than 2000W, the following Figure 2 The multi-path interleaved totem pole PFC circuit shown is beneficial to reducing the device temperature of the switch tubes on the first control bridge arm 100 and the second control bridge arm 300, and improving the operating reliability of the circuit; in addition, for every increase of 1000W to 2000W in input power, an additional control bridge arm connected in parallel with the first control bridge arm 100 can be added.

[0051] Reference Figure 3 In the totem pole PFC circuit provided in some embodiments of the present invention, the freewheeling bridge arm 200 further includes a seventh diode D7 and an eighth diode D8 connected in series, and a connection point between the seventh diode D7 and the eighth diode D8 is connected to one end of the AC power source AC. That is, the freewheeling bridge arm 200 includes a third diode D3, a fourth diode D4, a seventh diode D7 and an eighth diode D8, and the third diode D3, the fourth diode D4, the seventh diode D7 and the eighth diode D8 can constitute a rectifier bridge stack BR1. One end of the AC power supply AC is simultaneously connected to the positive electrode of the third diode D3, the negative electrode of the fourth diode D4, the positive electrode of the seventh diode D7 and the negative electrode of the eighth diode D8. The negative electrode of the third diode D3, the negative electrode of the seventh diode D7 and a switch pin of the first switch tube Q1 are connected together to form the positive electrode of the output end and connected to one end of the first capacitor C1. The positive electrode of the fourth diode D4, the positive electrode of the eighth diode D8 and a switch pin of the second switch tube Q2 are connected together and connected to one end of the sampling resistor Rs. The other end of the sampling resistor Rs is connected to the other end of the first capacitor C1 to form the negative electrode of the output end.

[0052] It can be understood that in this embodiment, four diodes of the rectifier bridge stack BR1 are used to form the freewheeling bridge arm 200, that is, a single integrated device is used, and there is no need to use multiple discrete diode devices to form the freewheeling bridge arm 200, which is beneficial to reducing the volume of the totem pole PFC circuit.

[0053] In a second aspect, an embodiment of the utility model provides a circuit board, comprising the totem pole PFC circuit of the embodiment of the first aspect above.

[0054] According to the circuit board provided by the embodiment of the utility model, by selecting IGBTs for the two switch tubes of the first control bridge arm 100 of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, and the two IGBT devices of the first control bridge arm 100 are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in actual application.

[0055] In a third aspect, an embodiment of the utility model provides a controller, comprising a circuit board as described in the embodiment of the second aspect above.

[0056] According to the controller provided by the embodiment of the utility model, by selecting IGBTs for the two switch tubes of the first control bridge arm 100 of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, and the two IGBT devices of the first control bridge arm 100 are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, effectively improving the reliability of the totem pole PFC circuit in actual application.

[0057] In a fourth aspect, an embodiment of the utility model provides an air conditioner, comprising the circuit board of the embodiment of the second aspect above, or comprising the controller of the embodiment of the third aspect above.

[0058] According to the air conditioner provided by the embodiment of the utility model, by selecting IGBTs for the two switch tubes of the first control bridge arm 100 of the totem pole PFC circuit, the circuit cost is greatly reduced compared with selecting MOS tubes, and the two IGBT devices of the first control bridge arm 100 are both anti-parallel connected with diodes, and by determining the reverse recovery characteristic parameters of the anti-parallel diodes of the two IGBT devices according to the test parameters in the preset test conditions, the total loss of the switch tube in the totem pole PFC circuit is more adapted to the heat dissipation capacity of the device, thereby making the core temperature of the switch tube device more consistent with the reliable operation margin value of the wafer, and effectively improving the reliability of the totem pole PFC circuit in actual application.

[0059] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed methods above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium or a non-transitory medium and a communication medium or a temporary medium. As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0060] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A totem pole PFC circuit, characterized in that: include: A first control bridge arm, the first control bridge arm comprises a first switch tube and a second switch tube connected in series, the first switch tube and the second switch tube adopt IGBT, a first diode is connected in anti-parallel at both ends of the first switch tube, and a second diode is connected in anti-parallel at both ends of the second switch tube; A freewheeling bridge arm, the freewheeling bridge arm is connected in parallel with the first control bridge arm, the freewheeling bridge arm comprises a third diode and a fourth diode connected in series, and a connection point between the third diode and the fourth diode is connected to one end of an AC power supply; A first inductor, one end of which is connected to the other end of the AC power supply, and the other end of which is connected to a connection point between the first switch tube and the second switch tube; Wherein: under preset test conditions, the reverse recovery characteristic parameters of the first diode and the second diode are less than preset values, and the preset values ​​are determined according to the test parameters in the preset test conditions.

2. The totem pole PFC circuit according to claim 1, characterized in that: The reverse recovery characteristic parameter is a reverse recovery current, and the preset value is a forward current in the preset test condition.

3. The totem pole PFC circuit according to claim 1, characterized in that: The preset test conditions include: a reverse test voltage of 400V, a forward current of 15A, a current change rate of 200A / μS, and a test temperature of 25°C; the reverse recovery characteristic parameter is a reverse recovery current, and the preset value is 15A.

4. The totem pole PFC circuit according to claim 1, characterized in that: The preset test conditions include: a reverse test voltage of 400V, a forward current of 15A, a current change rate of 200A / μS, and a test temperature of 25°C; the reverse recovery characteristic parameter is a reverse recovery charge, and the preset value is 2μC.

5. The totem pole PFC circuit according to claim 1, characterized in that: It also includes a second inductor and a second control bridge arm connected in parallel with the first control bridge arm, the second control bridge arm includes a third switch tube and a fourth switch tube connected in series, the third switch tube and the fourth switch tube use IGBT, a fifth diode is connected in anti-parallel at both ends of the third switch tube, and a sixth diode is connected in anti-parallel at both ends of the fourth switch tube; one end of the second inductor is connected to the other end of the AC power supply, and the other end of the second inductor is connected to the connection point of the third switch tube and the fourth switch tube.

6. The totem pole PFC circuit according to claim 1, characterized in that: The freewheeling bridge arm further includes a seventh diode and an eighth diode connected in series, and a connection point between the seventh diode and the eighth diode is connected to one end of an AC power source.

7. The totem pole PFC circuit according to claim 6, characterized in that: The third diode, the fourth diode, the seventh diode and the eighth diode constitute a rectifier bridge stack.

8. A circuit board, characterized in that: The totem pole PFC circuit comprises the totem pole PFC circuit as claimed in any one of claims 1 to 7.

9. A controller, characterized in that: Including the circuit board described in claim 8.

10. An air conditioner, characterized in that: Includes the circuit board described in claim 8, or includes the controller described in claim 9.

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