IPM devices and air conditioners

Abstract

This invention provides an IPM device and an air conditioner, relating to the field of air conditioning electronic control. The IPM device is applied to an air conditioner, which also includes a main control chip and a compressor. The IPM device includes an IPM module and an IPM power-on circuit. The main control chip, the IPM power-on circuit, the IPM module, and the compressor are sequentially electrically connected. The IPM power-on circuit, under the control of the main control chip, powers on the IPM module according to a sequence of first powering on the low-voltage circuit and then on the high-voltage circuit, so that the IPM module supplies power to the compressor, reducing the risk of damage to the IPM module due to improper power-on sequence.

Description

Technical Field

[0001] This invention relates to the field of air conditioning electronic control, and more specifically, to an IPM device and an air conditioner. Background Technology

[0002] IPM (Intelligent Power Module) is a power drive product that combines power electronics and integrated circuit technology. It is generally used on the electrical control boards of equipment such as air conditioner fans and compressors.

[0003] Currently, most IPM circuits do not control the power-on sequence of the IPM module's high and low voltage sides. If an unexpected situation occurs or there is a design problem, causing the high voltage side to be powered on first and the low voltage side to be powered on later, the IPM module may be damaged, and there may be safety hazards. Summary of the Invention

[0004] The present invention aims to provide, for example, an IPM device and an air conditioner that can power on the IPM module by first powering on the low-voltage circuit and then powering on the high-voltage circuit, thereby reducing the risk of damage to the IPM module.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows:

[0006] In a first aspect, embodiments of the present invention provide an IPM device applied to an air conditioner, the air conditioner further including a main control chip and a compressor, the IPM device including an IPM module and an IPM power-on circuit, the main control chip, the IPM power-on circuit, the IPM module and the compressor being electrically connected in sequence;

[0007] The IPM power-on circuit is used to power on the IPM module under the control of the main control chip, following a sequence of first powering on the weak current and then powering on the strong current, so that the IPM module can supply power to the compressor.

[0008] In one possible implementation, the IPM power-on circuit includes a high-voltage power-on circuit and a low-voltage power-on circuit. The IPM module is electrically connected to the high-voltage power-on circuit and the low-voltage power-on circuit, respectively, and both the high-voltage power-on circuit and the low-voltage power-on circuit are electrically connected to the main control chip.

[0009] The low-voltage power-on circuit is used to power on the IPM module in a low-voltage manner;

[0010] The high-voltage power-on circuit is used to power on the IPM module under the control of the main control chip after the main control chip determines that the IPM module has completed the low-voltage power-on.

[0011] In one possible implementation, the air conditioner further includes a three-phase power supply and a single-phase power supply, the low-voltage power supply circuit includes a first rectifier circuit and a first switching circuit, and the high-voltage power supply circuit includes a second rectifier circuit and a second switching circuit.

[0012] The single-phase power supply, the first rectifier circuit, the first switching circuit, and the IPM module are electrically connected in sequence; the three-phase power supply, the second rectifier circuit, the second switching circuit, and the IPM module are electrically connected in sequence; the main control chip is electrically connected to the first switching circuit and the second switching circuit respectively.

[0013] The first rectifier circuit is used to rectify the alternating current generated by the single-phase power supply to obtain the first direct current.

[0014] The first switching circuit is used to step down the first DC power and supply it to the IPM module to power on the IPM module with low voltage, and to send a power-on signal to the main control chip.

[0015] The second rectifier circuit is used to rectify the AC power generated by the three-phase power supply to obtain the second DC power.

[0016] The second switching circuit is used to switch from an off state to an on state under the control of the main control chip when the main control chip receives the power-on signal, so as to supply the second DC power to the IPM module to power on the IPM module.

[0017] In one possible implementation, the first switching circuit includes a switching power supply and a driver chip, wherein the single-phase power supply, the first rectifier circuit, the switching power supply, the driver chip and the IPM module are electrically connected in sequence, and the switching power supply is electrically connected to the main control chip.

[0018] The second switching circuit includes a relay, one end of the relay coil is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip; the first contact of the relay is electrically connected to the three-phase power supply through a second rectifier circuit, and the second contact is electrically connected to the IPM module.

[0019] The switching power supply is used to power on the IPM module via the driver chip when the single-phase power supply is powered on, and to send a power-on signal to the main control chip.

[0020] The relay is used to switch from an open state to an on state under the control of the main control chip when the main control chip receives the power-on signal, so that the three-phase power supply can provide high-voltage power to the IPM module.

[0021] In one possible implementation, the second switching circuit includes a first relay, a second relay, a thermistor, and a first capacitor;

[0022] One end of the coil of the first relay is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip; the first contact of the first relay is electrically connected to the three-phase power supply through the second rectifier circuit, and the second contact is electrically connected to the IPM module through the thermistor;

[0023] One end of the coil of the second relay is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip; the first contact of the second relay is electrically connected to the three-phase power supply through the second rectifier circuit, and the second contact is electrically connected between the thermistor and the IPM module;

[0024] One end of the first capacitor is electrically connected between the thermistor and the IPM module, and the other end is grounded;

[0025] The first relay is used to switch from an off state to an on state under the control of the main control chip when the main control chip receives the power-on signal, so as to charge the first capacitor;

[0026] The first relay is also used to switch from a conducting state to a disconnected state under the control of the main control chip after the main control chip receives the power-on signal for a preset duration, wherein the preset duration represents the time for the first capacitor to complete charging;

[0027] The second relay is used to switch from an off state to an on state under the control of the main control chip after the main control chip receives the power-on signal for a preset time, so that the three-phase power supply can provide high-voltage power to the IPM module.

[0028] In one possible implementation, the resistance of the thermistor increases with increasing temperature.

[0029] In one possible implementation, the first rectifier circuit is a rectifier bridge, with its input terminal electrically connected to the single-phase power supply and its output terminal electrically connected to the first switching circuit.

[0030] In one possible implementation, the low-voltage power-on circuit further includes a second capacitor, both ends of which are electrically connected between the rectifier bridge and the first switching circuit.

[0031] In one possible implementation, the second rectifier circuit is a three-phase rectifier bridge, with its input terminal electrically connected to the three-phase power supply and its output terminal electrically connected to the second switching circuit.

[0032] Secondly, embodiments of the present invention also provide an air conditioner, including a main control chip, a compressor, and an IPM device as described above.

[0033] Compared to existing technologies, this invention provides an IPM device and an air conditioner. The IPM device is applied to the air conditioner, which also includes a main control chip and a compressor. The IPM device includes an IPM module and an IPM power-on circuit. The main control chip, the IPM power-on circuit, the IPM module, and the compressor are electrically connected in sequence. The IPM power-on circuit, under the control of the main control chip, powers on the IPM module according to a sequence of first powering on the low-voltage circuit and then powering on the high-voltage circuit, so that the IPM module supplies power to the compressor. This reduces the risk of damage to the IPM module due to improper power-on sequence. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of an air conditioner provided in an embodiment of the present invention.

[0036] Figure 2 This is one of the schematic diagrams of an IPM device provided in an embodiment of the present invention.

[0037] Figure 3 This is a second schematic diagram of the IPM device provided in an embodiment of the present invention.

[0038] Figure 4 This is one of the schematic diagrams of the IPM power-on circuit provided in an embodiment of the present invention.

[0039] Figure 5 This is a second schematic diagram of the IPM power-on circuit provided in an embodiment of the present invention.

[0040] Figure 6 The circuit diagram of the rectifier bridge provided in the embodiment of the present invention.

[0041] Figure 7 The circuit diagram of the three-phase rectifier bridge provided in the embodiment of the present invention.

[0042] Icons: 10-Air conditioner; 20-IPM device; 30-Main control chip; 40-Compressor; 50-Three-phase power supply; 60-Single-phase power supply; 200-IPM module; 300-IPM power-on circuit; 310-High voltage power-on circuit; 320-Low voltage power-on circuit; 311-Second rectifier circuit; 312-Second switching circuit; 321-First rectifier circuit; 322-First switching circuit. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0047] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0048] In existing technologies, most air conditioner IPM circuits do not control the power-on sequence of the IPM module's strong and weak current circuits. If an unexpected situation or design flaw occurs, causing the strong current side to power on first and the weak current side later, the IPM module will be in a standby state after the strong current side is powered on. When the power supply on the weak current side is powered on, the voltage output of the switching power supply will fluctuate significantly, which may cause the driver chip to generate control signals, causing the IPM module to turn on erroneously. If both the upper and lower bridge IGBTs (Insulated Gate Bipolar Transistors) in the IPM module are turned on, the IPM module will be short-circuited, which will not only damage the components but also pose a safety hazard.

[0049] To address the aforementioned issues, this embodiment provides an IPM device applied to an air conditioner. This device can power on the IPM module by first powering on the low-voltage circuit and then powering on the high-voltage circuit, thereby reducing the risk of damage to the IPM module.

[0050] Please refer to Figure 1 , Figure 1 The diagram shows the structure of the air conditioner 10 provided in this embodiment. The air conditioner 10 includes an IPM device 20, a main control chip 30, and a compressor 40. The IPM device 20 includes an IPM module 200 and an IPM power-on circuit 300. The main control chip 30, the IPM power-on circuit 300, the IPM module 200, and the compressor 40 are electrically connected in sequence.

[0051] The IPM power-on circuit 300 is used to power on the IPM module 200 under the control of the main control chip 30, following the sequence of powering on the weak current first and then the strong current, so that the IPM module 200 can supply power to the compressor 40.

[0052] In this embodiment, the main control chip 30 can be an MCU (Microcontroller Unit).

[0053] Optional, please refer to Figure 2 The IPM power-on circuit 300 includes a high-voltage power-on circuit 310 and a low-voltage power-on circuit 320. The IPM module 200 is electrically connected to the high-voltage power-on circuit 310 and the low-voltage power-on circuit 320 respectively, and both the high-voltage power-on circuit 310 and the low-voltage power-on circuit 320 are electrically connected to the main control chip 30.

[0054] The low-voltage power-on circuit 320 is used to power on the IPM module 200 in a low-voltage manner.

[0055] The high-voltage power-on circuit 310 is used to power on the IPM module 200 under the control of the main control chip 30 after the main control chip 30 determines that the IPM module 200 has completed the low-voltage power-on.

[0056] Optional, please refer to Figure 3 The air conditioner 10 also includes a three-phase power supply 50 and a single-phase power supply 60. The low-voltage power supply circuit 320 includes a first rectifier circuit 321 and a first switch circuit 322. The high-voltage power supply circuit 310 includes a second rectifier circuit 311 and a second switch circuit 312.

[0057] The single-phase power supply 60, the first rectifier circuit 321, the first switch circuit 322, and the IPM module 200 are electrically connected in sequence; the three-phase power supply 50, the second rectifier circuit 311, the second switch circuit 312, and the IPM module 200 are electrically connected in sequence; the main control chip 30 is electrically connected to the first switch circuit 322 and the second switch circuit 312 respectively.

[0058] The first rectifier circuit 321 is used to rectify the AC power generated by the single-phase power supply 60 to obtain the first DC power.

[0059] The first switching circuit 322 is used to step down the first DC power and supply it to the IPM module 200 to power on the IPM module 200 with low voltage, and to send a power-on signal to the main control chip 30.

[0060] The second rectifier circuit 311 is used to rectify the AC power generated by the three-phase power supply 50 to obtain the second DC power.

[0061] The second switching circuit 312 is used to switch from the off state to the on state under the control of the main control chip 30 when the main control chip 30 receives the power-on signal, so as to supply the second DC power to the IPM module 200 to power on the IPM module 200.

[0062] In this embodiment, the three-phase power supply 50 and the single-phase power supply 60 can both be 220V AC power supplies. The AC power generated by the single-phase power supply 60 is converted into a first DC power with a small amplitude after passing through the first rectifier circuit 321 and the first switch circuit 322 in sequence, so as to provide low-voltage power to the IPM module 200. The amplitude of the first DC power can be 5V-12V.

[0063] Optional, please refer to Figure 4 The first switching circuit 322 includes a switching power supply S1 and a driver chip IC1. The single-phase power supply 60, the first rectifier circuit 321, the switching power supply S1, the driver chip IC1 and the IPM module 200 are electrically connected in sequence, and the switching power supply S1 is electrically connected to the main control chip 30.

[0064] The second switching circuit 312 includes a relay K1. One end of the coil of the relay K1 is electrically connected to the switching power supply S1, and the other end is electrically connected to the main control chip 30. The first contact of the relay K1 is electrically connected to the three-phase power supply 50 through the second rectifier circuit 311, and the second contact is electrically connected to the IPM module 200.

[0065] The switching power supply S1 is used to power on the IPM module 200 with low voltage through the driver chip IC1 when the single-phase power supply 60 is powered on, and to send a power-on signal to the main control chip 30.

[0066] Relay K1 is used to switch from an open state to an on state under the control of the main control chip 30 when the main control chip 30 receives the power-on signal, so that the three-phase power supply 50 can provide high-voltage power to the IPM module 200.

[0067] In this embodiment, when the switching power supply S1 is powered on, it sends a 5V electrical signal to the main control chip 30 to instruct the main control chip 30 to control the relay K1 to change from the open state to the closed conducting state.

[0068] Optional, please refer to Figure 5 The second switching circuit 312 includes a first relay K3, a second relay K4, a thermistor PTC, and a first capacitor C1.

[0069] One end of the coil of the first relay K2 is electrically connected to the switching power supply S2, and the other end is electrically connected to the main control chip 30; the first contact of the first relay K2 is electrically connected to the three-phase power supply 50 through the second rectifier circuit 311, and the second contact is electrically connected to the IPM module 200 through the thermistor PTC.

[0070] One end of the coil of the second relay K3 is electrically connected to the switching power supply S1, and the other end is electrically connected to the main control chip 30; the first contact of the second relay K3 is electrically connected to the three-phase power supply 50 through the second rectifier circuit 311, and the second contact is electrically connected between the thermistor PTC and the IPM module 200.

[0071] One end of the first capacitor C1 is electrically connected between the thermistor PTC and the IPM module 200, and the other end is grounded.

[0072] The first relay K2 is used to switch from an off state to an on state under the control of the main control chip 30 when the main control chip 30 receives a power-on signal, so as to charge the first capacitor C1.

[0073] The first relay K2 is also used to switch from the on state to the off state under the control of the main control chip 30 after the main control chip 30 receives the power-on signal for a preset time. The preset time represents the time it takes for the first capacitor C1 to complete charging.

[0074] The second relay K3 is used to switch from the off state to the on state under the control of the main control chip 30 after the main control chip 30 receives the power-on signal for a preset time, so that the three-phase power supply 50 can provide high-voltage power to the IPM module 200.

[0075] In this embodiment, after the switching power supply S1 is powered on, it provides voltage, which can be 12V, to the first relay K2 and the second relay K3. Simultaneously, it sends a voltage signal, which can be 5V, to the main control chip 30. Upon receiving the voltage signal from the switching power supply S1, the main control chip 30 first controls the first relay K2 to close. The three-phase power supply 50, after rectification by the three-phase rectifier bridge, obtains a second DC current. This second DC current charges the first capacitor C1 through the first relay K2 and the thermistor PTC.

[0076] The first capacitor C1 is used for filtering. Before supplying the second DC power to the IPM module 200, the first capacitor C1 is first charged. Due to the characteristic that the voltage across the capacitor cannot change abruptly, there is a large current spike when the first capacitor C1 is powered on, which can easily burn out the rectifier. Therefore, a thermistor PTC needs to be connected in series in the circuit to limit the current spike and protect the three-phase rectifier bridge.

[0077] The formula for calculating the charging time of the first capacitor C1 is:

[0078]

[0079] Where Ut is the voltage across the capacitor at time t, U is the power supply voltage, R is the resistance of the thermistor PTC, C is the capacitance of the first capacitor C1, and τ = RC is the time constant.

[0080] Only when t is infinitely large, Ut = U. Therefore, when Ut = 99%U, the capacitor is considered to be fully charged. At this time, t = 5RC. The power-on time difference can be adjusted by changing the value of RC.

[0081] After the capacitor is fully charged, the three-phase power supply 50 begins to power the IPM module 200. Since the thermistor PTC limits circuit current, causing power loss, and also generates significant heat that could burn out components, it is necessary to short-circuit the thermistor PTC.

[0082] Optionally, the resistance of the thermistor PTC increases with increasing temperature.

[0083] Optionally, the first rectifier circuit 321 is a rectifier bridge, with its input terminal electrically connected to the single-phase power supply 60 and its output terminal electrically connected to the first switching circuit 322.

[0084] In this embodiment, the input terminal of the rectifier bridge is electrically connected to the single-phase power supply 60 via the live wire and the neutral wire, respectively, and the output terminal is electrically connected to the switching power supply S1.

[0085] Optionally, the low-voltage power-on circuit 320 also includes a second capacitor C2, both ends of which are electrically connected between the rectifier bridge and the first switching circuit 322.

[0086] In this embodiment, both ends of the second capacitor C2 are electrically connected between the rectifier bridge and the switching power supply S1.

[0087] Please refer to Figure 6The first rectifier circuit 321 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The cathodes of the first diode D1 and the second diode D2 are electrically connected. The anodes of the second diode D2 and the third diode D3 are electrically connected. The anodes of the third diode D3 and the fourth diode D4 are electrically connected. The cathode of the fourth diode D4 and the first diode D1 are electrically connected.

[0088] A single-phase power supply 60 is electrically connected between the first diode D1 and the second diode D2 via the neutral wire N, and between the third diode D3 and the fourth diode D4 via the live wire L. A switching power supply S1 is electrically connected between the first diode D1 and the second diode D2, and between the third diode D3 and the fourth diode D4.

[0089] Optionally, the second rectifier circuit 311 is a three-phase rectifier bridge, with its input terminal electrically connected to the three-phase power supply 50 and its output terminal electrically connected to the second switching circuit 312.

[0090] In this embodiment, please refer to Figure 7 The second rectifier circuit 311 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, and a tenth diode D10.

[0091] The cathodes of the sixth diode D6, the eighth diode D8, and the tenth diode D10 are all electrically connected to the second contact of the second relay K3; the anodes of the fifth diode D5, the seventh diode D7, and the ninth diode D9 are all grounded.

[0092] The U phase of the three-phase power supply 50 is connected between the sixth diode D6 and the fifth diode D5, the V phase is connected between the eighth diode D8 and the seventh diode D7, and the W phase is connected between the tenth diode D10 and the ninth diode D9.

[0093] The working principle of the IPM device in this embodiment of the invention is as follows:

[0094] After the three-phase power supply 50 and the single-phase power supply 60 are powered on, the high-voltage side of the IPM module is not powered on because relays K2 and K3 are in the open state. On the low-voltage side, the AC power generated by the single-phase power supply 60 is rectified by the rectifier bridge to obtain the first DC power. The first DC power charges the second capacitor C2. After charging is completed, the switching power supply S1 starts working and powers on the IPM module via the driver chip.

[0095] When the switching power supply S1 first starts working, the output voltage fluctuates significantly, which may cause the driver chip IC1 to malfunction, generating a control signal that could mis-turn on the IPM module 200. However, even if both the upper and lower IGBTs of the IPM module 300 are turned on, resulting in a shoot-through short circuit, the IPM module will not be damaged because the high-voltage side is not powered, thus reducing the safety hazard. After the output voltage of the switching power supply stabilizes, the driver chip generates normal control signals to control the on / off state of the IGBTs in the IPM module.

[0096] When the switching power supply S1 is powered on, it provides voltage to the first relay K2 and the second relay K3, and sends a voltage signal to the main control chip 30. After receiving the voltage signal sent by the switching power supply S1, the main control chip 30 first controls the first relay K2 to close. After the three-phase power supply 50 is rectified by the three-phase rectifier bridge, the second DC power is obtained. The second DC power charges the first capacitor C1 through the first relay K2 and the thermistor PTC.

[0097] After a preset time following power-on of the switching power supply S1, the first capacitor C1 is fully charged. The main control chip 30 controls the first relay K2 to open and the second relay K3 to close, short-circuiting the thermistor PTC. At this time, the high-voltage side of the IPM module 200 is powered on, and the IPM module 200 starts working, driving the compressor 40 to work.

[0098] Compared with the prior art, this embodiment has the following beneficial effects:

[0099] First, the IPM device provided in this embodiment powers on the IPM module by first powering on the low-voltage circuit and then powering on the high-voltage circuit, which reduces the risk of damage to the IPM module.

[0100] Then, the IPM device provided in this embodiment, by adding a thermistor PTC in the high-voltage power-on circuit, can limit the current spike generated by the first capacitor C1 when the three-phase power supply 50 is charging it, thus protecting the components in the circuit.

[0101] Finally, if a short circuit occurs inside the IPM module during power-on, the short-circuit current flows through the thermistor PTC, causing the PTC to heat up and its resistance to increase, thereby limiting or blocking the current and protecting the circuit from damage.

[0102] In summary, this invention provides an IPM device and an air conditioner. The IPM device is applied to the air conditioner, which also includes a main control chip and a compressor. The IPM device includes an IPM module and an IPM power-on circuit. The main control chip, the IPM power-on circuit, the IPM module, and the compressor are electrically connected in sequence. The IPM power-on circuit, under the control of the main control chip, powers on the IPM module according to a sequence of first powering on the low-voltage circuit and then powering on the high-voltage circuit, so that the IPM module supplies power to the compressor. This reduces the risk of damage to the IPM module due to improper power-on sequence.

[0103] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An IPM device, characterized in that, The device is applied to an air conditioner (10), which also includes a main control chip (30) and a compressor (40). The IPM device (20) includes an IPM module (200) and an IPM power-on circuit (300). The main control chip (30), the IPM power-on circuit (300), the IPM module (200) and the compressor (40) are electrically connected in sequence. The IPM power-on circuit (300) is used to power on the IPM module (200) under the control of the main control chip (30) in the order of first powering on the weak current and then powering on the strong current, so that the IPM module (200) can supply power to the compressor (40); The IPM power-on circuit (300) includes a high-voltage power-on circuit (310) and a low-voltage power-on circuit (320). The IPM module (200) is electrically connected to the high-voltage power-on circuit (310) and the low-voltage power-on circuit (320) respectively, and both the high-voltage power-on circuit (310) and the low-voltage power-on circuit (320) are electrically connected to the main control chip (30). The low-voltage power-on circuit (320) is used to power on the IPM module (200) in a low-voltage manner; The high-voltage power-on circuit (310) is used to power on the IPM module (200) under the control of the main control chip (30) after the main control chip (30) determines that the IPM module (200) has completed the low-voltage power-on.

2. The IPM device according to claim 1, characterized in that, The air conditioner (10) also includes a three-phase power supply (50) and a single-phase power supply (60), the low-voltage power supply circuit (320) includes a first rectifier circuit (321) and a first switch circuit (322), and the high-voltage power supply circuit (310) includes a second rectifier circuit (311) and a second switch circuit (312). The single-phase power supply (60), the first rectifier circuit (321), the first switch circuit (322), and the IPM module (200) are electrically connected in sequence; the three-phase power supply (50), the second rectifier circuit (311), the second switch circuit (312), and the IPM module (200) are electrically connected in sequence; the main control chip (30) is electrically connected to the first switch circuit (322) and the second switch circuit (312) respectively; The first rectifier circuit (321) is used to rectify the alternating current generated by the single-phase power supply (60) to obtain the first direct current; The first switching circuit (322) is used to step down the first DC power and supply it to the IPM module (200) to power on the IPM module (200) with low voltage, and send a power-on signal to the main control chip (30); The second rectifier circuit (311) is used to rectify the AC power generated by the three-phase power supply (50) to obtain the second DC power. The second switching circuit (312) is used to switch from an open state to an on state under the control of the main control chip (30) when the main control chip (30) receives the power-on signal, so as to supply the second DC power to the IPM module (200) to power on the IPM module (200).

3. The IPM device according to claim 2, characterized in that, The first switching circuit (322) includes a switching power supply and a driver chip. The single-phase power supply (60), the first rectifier circuit (321), the switching power supply, the driver chip and the IPM module (200) are connected in sequence, and the switching power supply is connected to the main control chip (30). The second switching circuit (312) includes a relay, one end of the coil of the relay is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip (30); the first contact of the relay is electrically connected to the three-phase power supply (50) through the second rectifier circuit (311), and the second contact is electrically connected to the IPM module (200); The switching power supply is used to power on the IPM module (200) via the driving chip when the single-phase power supply (60) is powered on, and to send a power-on signal to the main control chip (30); The relay is used to switch from an open state to an on state under the control of the main control chip (30) when the main control chip (30) receives the power-on signal, so that the three-phase power supply (50) can provide high-voltage power to the IPM module (200).

4. The IPM device according to claim 2, characterized in that, The first switching circuit (322) includes a switching power supply and a driver chip. The single-phase power supply (60), the first rectifier circuit (321), the switching power supply, the driver chip and the IPM module (200) are connected in sequence, and the switching power supply is connected to the main control chip (30). The second switching circuit (312) includes a first relay, a second relay, a thermistor, and a first capacitor; one end of the coil of the first relay is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip (30); the first contact of the first relay is electrically connected to the three-phase power supply (50) through the second rectifier circuit (311), and the second contact is electrically connected to the IPM module (200) through the thermistor; One end of the coil of the second relay is electrically connected to the switching power supply, and the other end is electrically connected to the main control chip (30); the first contact of the second relay is electrically connected to the three-phase power supply (50) through the second rectifier circuit (311), and the second contact is electrically connected between the thermistor and the IPM module (200); One end of the first capacitor is electrically connected between the thermistor and the IPM module (200), and the other end is grounded; The first relay is used to switch from an off state to an on state under the control of the main control chip (30) when the main control chip (30) receives the power-on signal, so as to charge the first capacitor; The first relay is also used to switch from a conducting state to a disconnected state under the control of the main control chip (30) after the main control chip (30) receives the power-on signal for a preset time. The preset time represents the time when the first capacitor is fully charged. The second relay is used to switch from an open state to an on state under the control of the main control chip (30) after the main control chip (30) receives the power-on signal for a preset time, so that the three-phase power supply (50) can provide high-voltage power to the IPM module (200).

5. The IPM device according to claim 4, characterized in that, The resistance of the thermistor increases with increasing temperature.

6. The IPM device according to claim 2, characterized in that, The first rectifier circuit (321) is a rectifier bridge. The input end of the rectifier bridge is electrically connected to the single-phase power supply (60), and the output end is electrically connected to the first switching circuit (322).

7. The IPM device according to claim 6, characterized in that, The low-voltage power-on circuit (320) also includes a second capacitor, both ends of which are electrically connected between the rectifier bridge and the first switching circuit (322).

8. The IPM device according to claim 2, characterized in that, The second rectifier circuit (311) is a three-phase rectifier bridge. The input terminal of the three-phase rectifier bridge is electrically connected to the three-phase power supply (50), and the output terminal is electrically connected to the second switching circuit (312).

9. An air conditioner, characterized in that, It includes a main control chip (30), a compressor (40), and an IPM device (20) as described in any one of claims 1-8.

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