WO2017148121A1

WO2017148121A1 - Intelligent power module and air conditioner

Info

Publication number: WO2017148121A1
Application number: PCT/CN2016/097742
Authority: WO
Inventors: 冯宇翔
Original assignee: 广东美的制冷设备有限公司
Priority date: 2016-03-04
Filing date: 2016-08-31
Publication date: 2017-09-08

Abstract

An intelligent power module (1100) and an air conditioner. The intelligent power module comprises: three-phase upper bridge leg signal input ends (UHIN, VHIN, WHIN), three-phase lower bridge leg signal input ends (ULIN，VLIN，WLIN), three-phase low voltage reference ends (UN, VN, WN), a current detection end (MTRIP), and a PFC end (PFC); an HVIC pipe (1101) provided with wiring ends (HIN1, HIN2, HIN3, LIN1, LIN2, LIN3) respectively connected to the three-phase upper bridge leg signal input ends and the three-phase lower bridge leg signal input ends, and a first port (ITRIP) connected to the current detection end; a sampling resistor (138), wherein a first end of the sampling resistor (138) is connected to the three-phase low voltage reference ends and the current detection end, and a second end thereof is connected to a negative end (COM) of a low voltage area power supply of the intelligent power module; and a self-adaptive circuit (1105) and a PFC flyback circuit (1141) capable of reducing, by different means, the possibility that the intelligent power module is erroneously triggered at a high temperature, thereby improving the reliability of the intelligent power module.

Description

Intelligent power module and air conditioner

This application claims the priority of the following Chinese patent application:

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201610126212.3, and the invention name is “Intelligent Power Module and Air Conditioner” Chinese patent application;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201620169956.9, and the Chinese patent application titled “Intelligent Power Module and Air Conditioner”;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201610128259.3, and the invention title is “Intelligent Power Module and Air Conditioner” Chinese patent application;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201620169136.X, and the Chinese patent application titled “Intelligent Power Module and Air Conditioner”;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201610126188.3, and the invention title is “Intelligent Power Module and Air Conditioner” Chinese patent application;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201620169863.6, and the Chinese patent application titled “Intelligent Power Module and Air Conditioner”;

Submitted to the State Intellectual Property Office of China on March 4, 2016, the application number is 201610126143.6, and the invention title is “Intelligent Power Module and Air Conditioner” Chinese patent application;

On March 4, 2016, the Chinese Patent Application was submitted to the State Intellectual Property Office of China, application number 201620169846.2, and the invention name was “Intelligent Power Module and Air Conditioner”.

The entire contents of the above-identified patent application are incorporated herein by reference.

Technical field

The present invention relates to the field of intelligent power module technologies, and in particular, to an intelligent power module and an air conditioner.

Background technique

Intelligent Power Module (IPM) is a kind of power A power driver integrated with an electronic discrete device and an integrated circuit technology. The intelligent power module includes a power switching device and a high voltage driving circuit, and has a fault detecting circuit such as overvoltage, overcurrent, and overheating. The logic input of the intelligent power module receives the control signal of the main controller, and the output drives the compressor or the subsequent circuit to work, and sends the detected system status signal back to the main controller. Compared with the traditional discrete solution, the intelligent power module has the advantages of high integration, high reliability, self-test and protection circuit, especially suitable for driving the inverter of the motor and various inverter power sources. It is frequency conversion speed regulation, metallurgical machinery and electric power. Ideal power electronics for traction, servo drive, and variable frequency home appliances.

The schematic diagram of the existing intelligent power module circuit is shown in FIG. 1 , and the MTRIP port is used as a current detecting end to protect the smart power module 100 according to the detected current magnitude. The PFCIN port serves as the PFC (Power Factor Correction) control input of the intelligent power module.

During the operation of the intelligent power module, the PFCINP terminal frequently switches between high and low levels according to a certain frequency, so that the IGBT tube 127 is continuously in the switching state and the FRD tube 131 is continuously in the freewheeling state, and the frequency is generally LIN1 to LIN3, HIN1~ HIN3 switching frequency is 2 to 4 times, and is not directly related to the switching frequency of LIN1~LIN3, HIN1~HIN3.

As shown in FIG. 2, UN, VN, and WN are connected to one end of the milliohm resistor 138, and the other end of the milliohm resistor 138 is connected to GND. The MTRIP is a current detecting pin connected to one end of the milliohm resistor 138, and detects the milliohm resistor. The voltage drop measures the current, as shown in FIG. 3, when the current is too large, the intelligent power module 100 is stopped to avoid permanent damage to the smart power module 100 after overheating due to overcurrent.

- VP, COM, UN, VN, and WN have electrical connection relationships in actual use. Therefore, the voltage noise at the time of switching of the IGBT tube 121 to the IGBT tube 127 and the current noise when the FRD tube 111 to the FRD tube 116 and the FRD tube 131 are freewheeling are coupled to each other, and affect the input pins of the respective low voltage regions.

Among the input pins, the thresholds of HIN1 to HIN3, LIN1 to LIN3, and PFCINP are generally around 2.3V, and the threshold voltage of ITRIP is generally only 0.5V or less. Therefore, ITRIP is the most susceptible pin. When the ITRIP is triggered, the intelligent power module 100 will stop working, and since the overcurrent does not really occur at this time, the trigger of the ITRIIP at this time is a false trigger. As shown in FIG. 4, when PFCIN is at a high level and the IGBT tube 127 is turned on instantaneously, due to the existence of the reverse recovery current of the FRD tube 131, the current waveform of the I ₁₃₁ is superimposed, and the current has a large oscillating noise. - VP, COM, UN, VN, WN electrical connection in the peripheral circuit, the oscillating noise will be combined with a certain voltage rise at the MTRIP end. Let MTRIP trigger the condition: voltage>Vth, and duration>Tth; in Figure 4, if Ta<Tth<Tb, the voltage in the first three cycles is too high to cause MTRIP to trigger falsely. In four cycles, the MTRIP will generate a false trigger.

For a specific process FRD tube, the forward conduction voltage drop is inversely proportional to the reverse recovery time/reverse recovery current. The larger the forward voltage drop, the smaller the reverse recovery time/reverse recovery current, and the forward voltage drop. The smaller the reverse recovery time / the reverse recovery current is. Under the condition that no technical improvement occurs in the filming process, the influence on the bus voltage is reduced only by shortening the reverse recovery time, which inevitably leads to an increase in the forward voltage drop, thereby causing an increase in power consumption in the frequency band below 25 kHz. The switching frequency of the PFC is fixed and the frequency is between 20 kHz and 40 kHz. For this low frequency application, the effect of the reverse recovery current on the power consumption is less than the influence of the forward voltage drop on the power consumption. Guide the FRD tube with a lower voltage drop to achieve lower conduction loss. But in fact, because the reverse recovery time and reverse recovery current of the FRD tube are positive temperature coefficients, the higher the temperature, the longer the reverse recovery time, so the temperature of the smart power module 100 continues to rise as the system continues to operate, MTRIP The chances of being triggered are getting bigger and bigger.

As shown in Figure 5, at 25 ° C, the voltage fluctuation caused by the reverse recovery effect of FRD is not sufficient to cause MTRIP triggering, and as the temperature rises, at 75 ° C, MTRIP is triggered, causing the system to stop working. Although this false trigger will recover after a period of time without causing damage to the system, it will undoubtedly cause problems for users. For the application of inverter air conditioner, the higher the ambient temperature is, the more the user needs the air conditioning system to work continuously, but the high ambient temperature will increase the reverse recovery time of the FRD tube, and the probability of MTRIP being triggered by mistake is increased once. The MTRIP was mis-triggered, and the air-conditioning system stopped working for 3 to 5 minutes due to mistakes in over-current, which made the user unable to obtain cold air during this time. This is one of the main reasons for the air-conditioning system being complained by customers due to insufficient cooling capacity. .

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

An object of the present invention is to propose a new intelligent power module, which can effectively reduce the probability of an intelligent power module being falsely triggered at a high temperature and improve the reliability of the intelligent power module.

Another object of the present invention is to provide an air conditioner having the intelligent power module.

In order to achieve the above object, according to an embodiment of the first aspect of the present invention, an intelligent power module is provided, comprising: a three-phase upper arm signal input end, a three-phase lower arm signal input end, and a three-phase low voltage reference end. a current detecting terminal and a PFC terminal; a HVIC (High Voltage Integrated Circuit) tube, wherein the HVIC tube is provided with a signal signal input to the three-phase upper arm and a signal of the three-phase lower arm respectively a terminal of the input end, and a first port corresponding to the current detecting end, the first port is connected to the current detecting end through a connecting line; a sampling resistor, the three-phase low voltage reference end and the current detecting end Connected to the first end of the sampling resistor, the second end of the sampling resistor is connected to the low voltage power supply negative end of the intelligent power module; an adaptive circuit, the input end of the adaptive circuit is connected to the a first port, the first output end of the adaptive circuit is an enable end of the HVIC tube; a PFC freewheeling circuit, an input end of the PFC freewheeling circuit is connected to the adaptive circuit a second output end, a first input and output end of the PFC freewheeling circuit is connected to the PFC end, and a second input and output end of the PFC freewheeling circuit is connected to a high voltage input end of the smart power module, The PFC freewheeling circuit realizes the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value or the freewheeling current whose reverse recovery time is lower than the predetermined duration according to the level signal input from the input end of the PFC freewheeling circuit. The function of the diode;

Wherein the adaptive circuit outputs a signal of a first level through the second output terminal when the temperature of the smart power module is lower than a predetermined temperature value, and according to an input signal of an input end of the adaptive circuit And a magnitude relationship between the value and the first set value outputting an enable signal of a corresponding level through the first output terminal; the adaptive circuit is when the temperature of the smart power module is higher than the predetermined temperature value, Outputting a signal of a second level through the second output end, and outputting corresponding power through the first output end according to a magnitude relationship between a value of the input signal of the input end of the adaptive circuit and a second set value a flat enable signal, the second set value being greater than the first set value.

Specifically, when the temperature of the smart power module is lower than the predetermined temperature value, the value of the input signal and the first setting according to the input end of the adaptive circuit (ie, the first port, that is, the current detecting end) The magnitude relationship between the fixed values outputs an enable signal of a corresponding level, so that when the temperature of the intelligent power module is low, the adaptive circuit can react according to the signal value detected by the current detecting end, that is, the current detecting end detects When the signal value is large, the enable signal for controlling the HVIC tube to stop working is output in time, and when the signal value detected by the current detecting end is small, the enable signal for controlling the operation of the HVIC tube is output to ensure that the intelligent power module is at normal temperature (ie, When it is lower than the predetermined temperature value, it can work normally and perform overcurrent protection.

When the temperature of the intelligent power module is higher than the predetermined temperature value, the temperature of the smart power module is higher by outputting the enable signal of the corresponding level according to the magnitude relationship between the value of the input signal of the input end and the second set value. When the second set value (compared to the first set value) is used as a standard, whether to output an enable signal for controlling the HVIC tube to stop working can be determined, thereby effectively reducing the intelligent power module when operating at a high temperature. The chance of being triggered by mistake.

The PFC freewheeling circuit realizes the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value or the freewheeling diode whose reverse recovery time is shorter than the predetermined duration by the level signal input according to the input end of the PFC freewheeling circuit. The function is such that when the temperature of the intelligent power module is lower than the predetermined temperature value, the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value can be realized, so as to reduce the power consumption of the intelligent power module when operating at normal temperature; At the same time, when the temperature of the intelligent power module is higher than the predetermined temperature value, the function of the freewheeling diode whose reverse recovery time is lower than the predetermined duration can be realized, so as to reduce the circuit noise generated by the intelligent power module at a high temperature to reduce the intelligence. The probability that the power module will be falsely triggered when operating at high temperatures.

Further, when the temperature of the smart power module is lower than a predetermined temperature value, if the value of the input signal of the input end of the adaptive circuit is greater than or equal to the first set value, the adaptive circuit passes the The first output terminal outputs the first level enable signal to disable the HVIC tube from operating; otherwise, the second output enable signal is output through the first output terminal to allow the HVIC tube work;

The adaptive circuit, when the temperature of the smart power module is higher than the predetermined temperature value, if the value of the input signal of the input end of the adaptive circuit is greater than or equal to the second set value, The first output terminal outputs the first level enable signal; otherwise, the second level enable signal is output through the first output terminal.

Further, the adaptive circuit includes:

a first resistor, the first end of the first resistor is connected to the positive pole of the power supply of the adaptive circuit, the second end of the first resistor is connected to the cathode of the Zener diode, and the anode of the Zener diode is connected to the cathode a negative power supply of the adaptive circuit, wherein a positive pole and a negative pole of the power supply of the adaptive circuit are respectively connected to a positive end and a negative end of the low voltage power supply of the intelligent power module;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the first voltage comparator;

a thermistor, a first end of the thermistor is connected to a second end of the second resistor, and a second end of the thermistor is connected to an anode of the Zener diode;

a first voltage source, a cathode of the first voltage source is coupled to an anode of the Zener diode, a cathode of the first voltage source is coupled to a negative input terminal of the first voltage comparator, the first voltage An output of the comparator is coupled to the input of the first NOT gate, an output of the first NOT gate is coupled to an input of the second NOT gate, and an output of the second NOT gate is coupled to the first analog switch a control end and as a second output of the adaptive circuit;

a second voltage comparator, a positive input terminal of the second voltage comparator serving as an input terminal of the adaptive circuit, and a negative input terminal of the second voltage comparator being coupled to a positive terminal of the second voltage source, the a cathode of the two voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to the first selection end of the first analog switch and the first input of the first NAND gate end;

a third voltage comparator, a positive input terminal of the third voltage comparator is connected to a positive input terminal of the second voltage comparator, and a negative input terminal of the third voltage comparator is connected to a positive terminal of the third voltage source a negative electrode of the third voltage source is connected to a negative power supply of the adaptive circuit, and an output of the third voltage comparator is connected to a second input of the first NAND gate, the first and the second The output end of the gate is connected to the input end of the third non-gate, the output end of the third non-gate is connected to the second selection end of the first analog switch, and the fixed end of the first analog switch is connected to the fourth At the input of the NOT gate, the output of the fourth NOT gate serves as the first output of the adaptive circuit.

Further, the PFC freewheeling circuit includes two freewheeling diodes; the PFC freewheeling circuit selects the two freewheeling currents when the signal of the first level is input at an input end of the PFC freewheeling circuit a freewheeling diode having a lower voltage drop in the diode is connected to the circuit; and the PFC freewheeling circuit is configured to input the signal of the second level at an input end of the PFC freewheeling circuit A freewheeling diode with a shorter reverse recovery time in the two freewheeling diodes is selected.

Further, the PFC freewheeling circuit includes: a second analog switch, a fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit, and a first selected end of the second analog switch Connected to the cathode of the first freewheeling diode, the second selected end of the second analog switch is connected to the cathode of the second freewheeling diode; the third analog switch, the fixed end of the third analog switch is used as the PFC a second input and output end of the flow circuit, a first selection end of the third analog switch is connected to an anode of the first freewheeling diode, and a second selection end of the third analog switch is connected to the second continuation An anode of the flow diode; wherein a control end of the third analog switch is coupled to a control end of the second analog switch and serves as an input of the PFC freewheeling circuit.

Further, the HVIC tube is further provided with a signal output end of the PFC driving circuit, the smart power module further includes: a first power switch tube and a first diode, the anode of the first diode is connected to the first An emitter of the power switch tube, a cathode of the first diode is connected to a collector of the first power switch tube, and a base of the first power switch tube is connected to a signal output end of the PFC drive circuit The emitter of the first power switch tube serves as a PFC low voltage reference terminal of the smart power module, and the collector of the first power switch tube serves as the PFC terminal.

The first power switch tube may be an IGBT (Insulated Gate Bipolar Transistor).

Further, the smart power module further includes: a bootstrap circuit, the bootstrap circuit includes: a first bootstrap diode, an anode of the first bootstrap diode is connected to a low voltage power supply of the smart power module a cathode of the first bootstrap diode is connected to a positive end of a U-phase high voltage power supply of the smart power module; a second bootstrap diode, an anode of the second bootstrap diode is connected to the smart power module a low voltage region power supply positive terminal, a cathode of the second bootstrap diode is connected to a positive phase of a V phase high voltage region power supply of the smart power module; a third bootstrap diode, an anode connection of the third bootstrap diode To the positive end of the low voltage power supply of the smart power module, the cathode of the third bootstrap diode is connected to the positive end of the W phase high voltage power supply of the intelligent power module.

Further, the intelligent power module further includes: a three-phase upper arm circuit, wherein an input end of the bridge arm circuit of each phase of the three-phase upper arm circuit is connected to a three-phase high voltage of the HVIC tube a signal output end of the corresponding phase in the zone; a three-phase lower arm circuit, an input end of each phase lower arm circuit of the three-phase lower arm circuit is connected to a corresponding phase in the three-phase low-voltage zone of the HVIC pipe Signal output.

The three-phase upper arm circuit includes: a U-phase upper arm circuit, a V-phase upper arm circuit, and a W-phase upper arm circuit; the three-phase lower arm circuit includes: a U-phase lower arm circuit, and a V-phase lower bridge Arm circuit, W phase lower arm circuit.

Further, the bridge arm circuit of each phase includes: a second power switch tube and a second diode, an anode of the second diode is connected to an emitter of the second power switch tube, a cathode of the second diode is connected to the collector of the second power switch tube, a collector of the second power switch tube is connected to a high voltage input end of the smart power module, the second power switch tube The base of the second power switch is connected to the negative end of the high voltage power supply of the corresponding phase of the smart power module. Wherein, the second power switch tube can be an IGBT.

Further, each phase lower arm circuit includes: a third power switch tube and a third diode, an anode of the third diode is connected to an emitter of the third power switch tube, a cathode of the third diode is connected to the collector of the third power switch tube, and a collector of the third power switch tube is connected to an anode of the second diode in the corresponding upper arm circuit, The base of the third power switch tube serves as an input end of the lower phase bridge circuit of each phase, and the emitter of the third power switch tube serves as a low voltage reference end of a corresponding phase of the smart power module. The third power switch tube may be an IGBT.

Further, the voltage of the high voltage input end of the intelligent power module is 300V; and a filter capacitor is connected between the positive end and the negative end of the power supply of each phase of the intelligent power module.

According to an embodiment of the second aspect of the present invention, an intelligent power module is further provided, comprising: a three-phase upper arm signal input end, a three-phase lower arm signal input end, a three-phase low voltage reference end, a current detecting end, a PFC control input terminal and a PFC terminal; the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and corresponding to the a first port of the current detecting end and a second port corresponding to the PFC control input, the first port is connected to the current detecting end through a connecting line, and the second port passes through the connecting line and the PFC control input end Connected; sampling resistor, said three phase a low voltage reference terminal and the current detecting terminal are both connected to a first end of the sampling resistor, and a second end of the sampling resistor is connected to a low voltage region power supply negative terminal of the smart power module; an adaptive circuit The first input end and the second input end of the adaptive circuit are respectively connected to the first port and the second port, and the first output end of the adaptive circuit is used as an enable end of the HVIC tube;

a PFC freewheeling circuit, the first input end, the second input end, the first input output end, and the second input/output end of the PFC freewheeling circuit are respectively connected to the second output end of the adaptive circuit, a third output end of the adaptive circuit, the PFC end, and a high voltage input end of the smart power module, wherein the PFC freewheeling circuit is implemented according to a level signal input by two input ends of the PFC freewheeling circuit a function of a freewheeling diode whose forward voltage is lowered by a predetermined voltage drop value or a function of a freewheeling diode whose reverse recovery current is controlled;

The adaptive circuit passes the temperature of the smart power module, the size of the input signal of the first input end of the adaptive circuit, and whether the input signal of the second input end of the adaptive circuit is on a rising edge. The first output terminal, the second output terminal, and the third output terminal output signals of respective levels.

Specifically, the PFC freewheeling circuit realizes the function of the freewheeling diode whose forward conduction voltage is lowered by the predetermined voltage drop value or realizes the reverse recovery current controlled by the level signal input from the two input terminals of the PFC freewheeling circuit. The function of the freewheeling diode makes it possible to realize the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value when the temperature of the intelligent power module is lower than the predetermined temperature value, so as to reduce the intelligent power module at normal temperature (ie, the temperature is low) The power consumption at the time of the predetermined temperature value; at the same time, when the temperature of the intelligent power module is higher than the predetermined temperature value, if the signal input from the PFC control input is at the rising edge, the reverse recovery current can be controlled. The function of the freewheeling diode is to suppress its influence on the bus voltage, which in turn reduces the chance of the smart power module being falsely triggered when operating at high temperatures.

The adaptive circuit passes through the first output end and the second output end according to whether the temperature of the smart power module, the size of the input signal of the first input end of the adaptive circuit, and the input signal of the second input end of the adaptive circuit are at a rising edge And outputting a corresponding level of the enable signal to the third output terminal, so that when the temperature of the smart power module is low, the adaptive circuit can react according to the signal value detected by the current detecting terminal to ensure that the smart power module is at normal temperature (ie below the predetermined temperature) Under the degree of value, it can work normally and perform overcurrent protection. When the temperature of the intelligent power module is higher than the predetermined temperature value, it is possible to determine whether to output an enable signal for controlling the HVIC tube to stop working by using a large standard value (a standard value higher than a lower temperature) as a standard, thereby being effective. Reduce the chance of the smart power module being falsely triggered when operating at high temperatures.

Further, the adaptive circuit outputs a signal of a first level through the second output terminal when the temperature of the smart power module is lower than a predetermined temperature value, and a temperature of the smart power module is higher than the predetermined a second level output signal through the second output terminal;

The adaptive circuit outputs the signal of the second level through the third output terminal within a predetermined period of time after the rising edge of the input signal of the second input end of the adaptive circuit; a third output terminal outputs the signal of the first level;

The adaptive circuit, when the temperature of the smart power module is lower than a predetermined temperature value, if the value of the input signal of the first input end of the adaptive circuit is greater than or equal to the first set value, Outputting the first level enable signal to disable operation of the HVIC tube; otherwise, outputting the second level enable signal through the first output terminal to allow the HVIC tube to operate ;

The adaptive circuit, when the temperature of the smart power module is higher than the predetermined temperature value, if the value of the input signal of the first input end of the adaptive circuit is greater than or equal to the second set value, The first output terminal outputs the first level enable signal; otherwise, the second output enable signal is output through the first output terminal;

The second set value is greater than the first set value.

Further, the adaptive circuit includes:

a first non-gate and a second non-gate connected in series, the input end of the first non-gate is used as a second input end of the adaptive circuit, and the output end of the second non-gate is connected to the first NAND gate First input;

a third non-gate, a fourth non-gate, and a fifth non-gate connected in series, the input end of the third non-gate is connected to the input end of the first non-gate, and the output end of the fifth non-gate is connected to a second input end of the first NAND gate, an output end of the first NAND gate is connected to an input end of a sixth NOT gate, and an output end of the sixth NOT gate is used as the first Three output terminals;

a first capacitor connected to the input end of the fourth NOT gate and the power supply of the adaptive circuit Between the source and the cathode;

a second capacitor connected between the input end of the fifth inverting gate and the negative pole of the power supply of the adaptive circuit;

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the adaptive circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode is connected To the negative pole of the power supply of the adaptive circuit, the positive and negative poles of the power supply of the adaptive circuit are respectively connected to the positive and negative terminals of the low-voltage power supply of the intelligent power module;

a first voltage source, a cathode of the first voltage source is coupled to an anode of the Zener diode, a cathode of the first voltage source is coupled to a negative input terminal of the first voltage comparator, the first voltage The output of the comparator is connected to the input of the seventh non-gate, the output of the seventh non-gate is connected to the input of the eighth non-gate, and the output of the eighth non-gate is connected to the first analog switch a control end and as a second output of the adaptive circuit;

a second voltage comparator, a positive input terminal of the second voltage comparator serving as a first input terminal of the adaptive circuit, and a negative input terminal of the second voltage comparator being coupled to a positive terminal of the second voltage source a cathode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a first selection end of the first analog switch and a second NAND gate An input;

a third voltage comparator, a positive input terminal of the third voltage comparator is connected to a positive input terminal of the second voltage comparator, and a negative input terminal of the third voltage comparator is connected to a positive terminal of the third voltage source a cathode of the third voltage source is connected to a negative power supply of the adaptive circuit, and an output of the third voltage comparator is connected to a second input of the second NAND gate, the second The output end of the gate is connected to the input end of the ninth non-gate, the output end of the ninth non-gate is connected to the second selection end of the first analog switch, and the fixed end of the first analog switch is connected to the tenth At the input of the NOT gate, the output of the tenth NOT gate serves as the first output of the adaptive circuit.

Further, the PFC freewheeling circuit is in two inputs of the PFC freewheeling circuit a function of a freewheeling diode that reduces a forward voltage drop to a predetermined voltage drop value when at least one input terminal inputs the signal of the first level; and two PFC freewheeling circuits in the PFC freewheeling circuit When the input terminal inputs the signal of the second level, the function of the reverse recovery current controlled freewheeling diode is realized.

Further, the PFC freewheeling circuit includes:

a third NAND gate, two input ends of the third NAND gate respectively serving as two input ends of the PFC freewheeling circuit, and an output end of the third NAND gate is connected to the eleventh non-gate An output end of the eleventh non-gate is connected to a control end of the second analog switch, and a fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit;

a third resistor, a first end of the third resistor is connected to the first selection end of the second analog switch, and a second end of the third resistor is connected to the second selection end of the second analog switch, And as the second input and output of the PFC freewheeling circuit.

Further, the HVIC tube is further provided with a signal output end of the PFC driving circuit, the smart power module further includes: a first power switch tube and a first diode, the anode of the first diode is connected to An emitter of the first power switch tube, a cathode of the first diode is connected to a collector of the first power switch tube, and a base of the first power switch tube is connected to the PFC drive circuit The signal output end, the emitter of the first power switch tube serves as a PFC low voltage reference end of the smart power module, and the collector of the first power switch tube serves as the PFC end. Wherein, the first power switch tube can be an IGBT.

Further, the intelligent power module further includes: a three-phase upper arm circuit, on the three-phase An input end of the bridge arm circuit of each phase in the bridge arm circuit is connected to a signal output end of a corresponding phase in a three-phase high voltage region of the HVIC tube; a three-phase lower arm circuit, in the three-phase lower arm circuit The input of each phase lower arm circuit is connected to the signal output of the corresponding phase in the three-phase low voltage region of the HVIC tube.

According to the embodiment of the third aspect of the present invention, an intelligent power module is further provided, comprising: a three-phase upper arm signal input end, a three-phase lower arm signal input end, a three-phase low voltage reference end, and a current detecting end. And a PFC terminal; the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and corresponding to the current detecting end a port, the first port is connected to the current detecting end through a connecting line; a sampling resistor, the three-phase low voltage reference end and the current detecting end are connected To a first end of the sampling resistor, a second end of the sampling resistor is connected to a negative voltage supply power supply negative end of the smart power module; and an adaptive circuit, the first input end of the adaptive circuit is connected to the a first port, an output end of the adaptive circuit is used as an enable end of the HVIC tube; a PFC freewheeling circuit, a first input output end, a second input output end, and an output end of the PFC freewheeling circuit respectively Corresponding to the PFC terminal, the high voltage input end of the smart power module, and the second input end of the adaptive circuit, the PFC freewheeling circuit realizes a forward conduction voltage according to the temperature of the smart power module. a function of a freewheeling diode lowering the predetermined voltage drop value or a function of a freewheeling diode having a reverse recovery duration less than a predetermined duration, and continuing through the PFC when the temperature of the intelligent power module is lower than a predetermined temperature value The output end of the flow circuit outputs a signal of a first level, and when the temperature of the smart power module is higher than the predetermined temperature value, a signal of a second level is output through an output end of the PFC freewheeling circuit;

The adaptive circuit outputs an enable signal of a corresponding level through an output end of the adaptive circuit according to a size of an input signal of the first input end and a level signal input by the second input end.

Specifically, the PFC freewheeling circuit realizes the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value or the function of the freewheeling diode whose reverse recovery time is shorter than the predetermined duration, according to the temperature of the intelligent power module, When the temperature of the intelligent power module is lower than the predetermined temperature value, the function of the freewheeling diode whose forward conduction voltage is lower than the predetermined voltage drop value can be realized, so as to reduce the power consumption of the intelligent power module when operating at normal temperature; When the temperature of the power module is higher than the predetermined temperature value, the function of the freewheeling diode whose reverse recovery time is lower than the predetermined duration can be realized, so as to reduce the circuit noise generated by the intelligent power module at a high temperature, so as to reduce the high temperature of the intelligent power module. The chance of being triggered by mistake when working.

The adaptive circuit outputs an enable signal of a corresponding level according to the magnitude of the input signal of the first input terminal (ie, the first port, that is, the current detecting terminal) and the level signal input by the second input terminal, so that the smart signal is enabled in the smart When the temperature of the power module is low, the adaptive circuit can react according to the signal value detected by the current detecting terminal to ensure that the intelligent power module can work normally at normal temperature (ie, below a predetermined temperature value) and has been performed. Stream protection. When the temperature of the intelligent power module is higher than the predetermined temperature value, the larger standard value (greater than the standard value when the temperature is lower) can be used to determine whether to output an enable signal for controlling the HVIC tube to stop working, thereby effectively reducing the intelligence. The probability that the power module will be falsely triggered when operating at high temperatures.

Further, when the input signal of the first level is input by the second input terminal, if the value of the input signal of the first input end is greater than or equal to the first set value, An output of the adaptive circuit outputs an enable signal of the first level to disable operation of the HVIC tube; otherwise, an output signal of the second level is output through an output of the adaptive circuit to Allowing the HVIC tube to work;

The adaptive circuit, when the second input terminal inputs the signal of the second level, if the value of the input signal of the first input terminal is greater than or equal to a second set value, Outputting the first level of the enable signal; otherwise, outputting the second level enable signal through the output of the adaptive circuit;

The second set value is greater than the first set value.

Further, the adaptive circuit includes:

a first voltage comparator, a positive input terminal of the first voltage comparator serves as a first input end of the adaptive circuit, and a negative input terminal of the first voltage comparator is coupled to a positive terminal of the first voltage source, a cathode of the first voltage source is connected to a negative power supply of the adaptive circuit, and an output of the first voltage comparator is connected to a first selection end of the first analog switch and a first input of the first NAND gate The positive and negative terminals of the power supply of the adaptive circuit are respectively connected to the positive end and the negative end of the low-voltage power supply of the intelligent power module;

a second voltage comparator, a positive input terminal of the second voltage comparator is coupled to a positive input terminal of the first voltage comparator, and a negative input terminal of the second voltage comparator is coupled to a positive terminal of a second voltage source a negative electrode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a second input of the first NAND gate, the first An output end of the NAND gate is connected to the input end of the first NOT gate, and an output end of the first NOT gate is connected to a second selection end of the first analog switch, and the control end of the first analog switch serves as a The second input end of the adaptive circuit, the fixed end of the first analog switch is connected to the input end of the second NOT gate, and the output end of the second NOT gate is used as an output end of the adaptive circuit.

Further, the PFC freewheeling circuit realizes a function of a freewheeling diode whose forward conduction voltage is lowered to a predetermined voltage drop value when the temperature of the intelligent power module is lower than a predetermined temperature value; and the PFC freewheeling circuit is When the temperature of the intelligent power module is higher than the predetermined temperature value, A function of a freewheeling diode whose reverse recovery time is shorter than a predetermined duration.

Further, the PFC freewheeling circuit includes: a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the PFC freewheeling circuit, and a second end of the first resistor is connected to a voltage regulator a cathode of the diode, an anode of the Zener diode is connected to a negative pole of a power supply of the PFC freewheeling circuit, and a positive pole and a cathode of the power supply of the PFC freewheeling circuit are respectively connected to a low voltage power supply of the intelligent power module End and negative end;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the third voltage comparator;

a third voltage source, a cathode of the third voltage source is connected to an anode of the Zener diode, a cathode of the third voltage source is connected to a negative input terminal of the third voltage comparator, the third voltage The output of the comparator is connected to the input of the third NOT gate, the output of the third NOT gate is connected to the input of the fourth NOT gate, and the output of the fourth NOT gate is used as the PFC freewheeling circuit Output

a second analog switch, the fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit, and the first selected end of the second analog switch is connected to a cathode of the first freewheeling diode The second selection end of the second analog switch is connected to the cathode of the second freewheeling diode, and the control end of the second analog switch is connected to the output end of the fourth non-gate;

a third analog switch, the fixed end of the third analog switch serves as a second input and output end of the PFC freewheeling circuit, and the first selected end of the third analog switch is connected to an anode of the first freewheeling diode a second selection end of the third analog switch is connected to an anode of the second freewheeling diode, and a control end of the third analog switch is connected to an output end of the fourth NOT gate;

Wherein the forward conduction voltage of the first freewheeling diode is lowered by a predetermined voltage drop value, the reverse recovery time of the second freewheeling diode is lower than a predetermined duration, and the thermistor is disposed at the first continuation The position of the flow diode and the second freewheeling diode.

Further, the HVIC tube is further provided with a signal output end of the PFC driving circuit, the smart power module further includes: a first power switch tube and a first diode, the anode of the first diode is connected to An emitter of the first power switch tube, a cathode connection of the first diode a base of the first power switch, a base of the first power switch connected to a signal output end of the PFC drive circuit, and an emitter of the first power switch as the smart power module a PFC low voltage reference terminal, the collector of the first power switch tube acts as the PFC terminal. Wherein, the first power switch tube can be an IGBT.

Further, the intelligent power module further includes: a three-phase upper arm circuit, wherein an input end of each phase upper arm circuit of the three-phase upper arm circuit is connected to a three-phase high voltage region of the HVIC tube a signal output end of the corresponding phase; a three-phase lower arm circuit, wherein an input end of each phase lower arm circuit of the three-phase lower arm circuit is connected to a signal of a corresponding phase in a three-phase low voltage region of the HVIC tube Output. The three-phase upper arm circuit includes: a U-phase upper arm circuit, a V-phase upper arm circuit, and a W-phase upper arm circuit; the three-phase lower arm circuit includes: a U-phase lower arm circuit, and a V-phase lower bridge Arm circuit, W phase lower arm circuit.

Further, each phase lower arm circuit includes: a third power switch tube and a third diode, an anode of the third diode is connected to an emitter of the third power switch tube, First a cathode of the third diode is connected to the collector of the third power switch tube, and a collector of the third power switch tube is connected to an anode of the second diode in the corresponding upper arm circuit, the The base of the three-power switch tube serves as an input end of the lower-side bridge arm circuit, and the emitter of the third power switch tube serves as a low-voltage reference terminal of a corresponding phase of the smart power module. The third power switch tube may be an IGBT.

According to the embodiment of the fourth aspect of the present invention, an intelligent power module is further provided, comprising: a three-phase upper arm signal input end, a three-phase lower arm signal input end, a three-phase low voltage reference end, and a current detecting end. a PFC control input terminal and a PFC terminal; a sampling resistor, the three-phase low voltage reference terminal and the current detecting terminal are both connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected to the a low voltage area power supply negative end of the intelligent power module; a HVIC tube, wherein the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and respectively Corresponding to a first port and a second port connected to the current detecting end and the PFC control input end, a PFC driving circuit is disposed in the HVIC tube; an adaptive circuit, a first input end and a second input end of the adaptive circuit The input ends are respectively connected to the first port and the second port, the first output end of the adaptive circuit is an enable end of the HVIC tube, and the second output end of the adaptive circuit is connected to Said a signal input end of the PFC driving circuit; a PFC freewheeling circuit, wherein the first input output end, the second input output end, and the output end of the PFC freewheeling circuit are respectively connected to the PFC end, and the smart power module is respectively connected a voltage input end and a third input end of the adaptive circuit, the PFC freewheeling circuit outputs a first power through an output end of the PFC freewheeling circuit when a temperature of the smart power module is lower than a predetermined temperature value a flat signal, when the temperature of the smart power module is higher than the predetermined temperature value, outputting a signal of a second level through an output end of the PFC freewheeling circuit;

The adaptive circuit outputs an enable signal of a corresponding level through the first output end of the adaptive circuit according to the level signal input by the third input terminal and the magnitude of the input signal of the first input terminal. And controlling, by the second output end of the adaptive circuit, a control signal for controlling the PFC driving circuit.

Specifically, the PFC freewheeling circuit passes the temperature of the intelligent power module below a predetermined temperature value. When the output of the first power level signal is output through the output terminal thereof, when the temperature of the intelligent power module is higher than the predetermined temperature value, the second level signal is output through the output end thereof, so that the PFC freewheeling circuit can sense the sensed temperature. The signal is passed to the adaptive circuit, which is adjusted accordingly by the adaptive circuit.

The adaptive circuit passes through the level signal input from the third input terminal (ie, the signal transmitted from the PFC freewheeling circuit) and the input signal of the first input terminal (ie, the first port, that is, the current detecting terminal) The first output terminal outputs an enable signal of a corresponding level, and outputs a control signal for controlling the PFC driving circuit through the second output terminal thereof, so that when the temperature of the smart power module is low, the adaptive circuit can detect the current detecting terminal according to the current detecting terminal. The signal value reacts to ensure that the intelligent power module is functioning properly at normal temperature (ie, below a predetermined temperature value) and that the PFC circuit can be used normally without overcurrent protection. On the other hand, when the temperature of the intelligent power module is higher than the predetermined temperature value, on the one hand, it is possible to determine whether to output an enable signal for controlling the HVIC tube to stop working by a larger standard value (greater than the standard value at a lower temperature). It is also possible to suspend the use of the PFC circuit to reduce noise interference, thereby effectively reducing the probability of the intelligent power module being falsely triggered when operating at high temperatures, and improving the adaptability of the intelligent power module to temperature.

Further, when the third input terminal inputs the signal of the first level, if the value of the input signal of the first input terminal is greater than or equal to the first set value, a first output of the adaptive circuit outputs an enable signal of the first level to disable operation of the HVIC tube; otherwise, outputting the second level by a first output of the adaptive circuit a signal capable of allowing the HVIC tube to operate and outputting a control signal for controlling an output signal of the PFC driving circuit to be synchronized with an input signal through a second output end of the adaptive circuit;

And the adaptive circuit, when the signal of the second level is input by the third input end, if the value of the input signal of the first input end is greater than or equal to a second set value, pass the adaptive circuit The first output terminal outputs the first level enable signal; otherwise, the first output terminal of the adaptive circuit outputs the second level enable signal, and passes through the adaptive circuit The second output terminal outputs a control signal for controlling the PFC driving circuit to stop working;

The second set value is greater than the first set value.

Specifically, when the third input terminal of the adaptive circuit inputs the signal of the first level, it indicates that the temperature of the smart power module is low, and the adaptive circuit can use the first set value as the standard value to determine whether to output the control. The enable signal of the HVIC tube stops working, and the input at the first input When the value of the incoming signal is small (less than the first set value), it is also possible to ensure the normal operation of the PFC circuit by controlling the output signal of the PFC driving circuit to be synchronized with the input signal to improve system efficiency. When the third input of the adaptive circuit inputs the signal of the second level, the temperature of the smart power module is high, and the adaptive circuit determines whether to output by using the larger second set value as the standard value. The enable signal for controlling the HVIC tube to stop working can reduce the probability of the intelligent power module being erroneously triggered when operating at a high temperature; and because the temperature of the intelligent power module is high, even when the value of the input signal at the first input is small ( Less than the second set value), also indirectly control the PFC circuit to stop working normally by controlling the PFC drive circuit to stop working, thereby improving the stability of the system and reducing the error caused by the signal interference of the intelligent power module when operating at high temperature. The chance of triggering.

Further, the adaptive circuit includes:

a second voltage comparator, a positive input terminal of the second voltage comparator is coupled to a positive input terminal of the first voltage comparator, and a negative input terminal of the second voltage comparator is coupled to a positive terminal of a second voltage source a negative electrode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a second input of the first NAND gate, the first An output end of the NAND gate is connected to the input end of the first NOT gate, and an output end of the first NOT gate is connected to a second selection end of the first analog switch, and the control end of the first analog switch serves as a a third input end of the adaptive circuit, the fixed end of the first analog switch is connected to the input end of the second NOT gate, and the output end of the second NOT gate is used as the first output end of the adaptive circuit;

a first input end of the NOR gate as a second input end of the adaptive circuit, and a second input end of the NOR gate is connected to a third input end of the adaptive circuit, The output of the NOR gate is connected to the input of the third NOT gate, and the output of the third NOT gate serves as the second output of the adaptive circuit.

According to an embodiment of the invention, the PFC freewheeling circuit comprises:

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the PFC freewheeling circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode Connected to the negative pole of the power supply of the PFC freewheeling circuit, the positive and negative poles of the power supply of the PFC freewheeling circuit are respectively connected to the positive and negative terminals of the low voltage power supply of the intelligent power module;

a third voltage source, a cathode of the third voltage source is connected to an anode of the Zener diode, a cathode of the third voltage source is connected to a negative input terminal of the third voltage comparator, the third voltage The output of the comparator is connected to the input of the fourth NOT gate, the output of the fourth NOT gate is connected to the input of the fifth NOT gate, and the output of the fifth NOT gate is used as the PFC freewheeling circuit Output

a freewheeling diode having an anode as a first input and output of the PFC freewheeling circuit, and a cathode of the freewheeling diode as a second input and output of the PFC freewheeling circuit;

Wherein the thermistor is disposed at a position where the freewheeling diode is located.

Further, the smart power module further includes: a bootstrap circuit, the bootstrap circuit includes: a first bootstrap diode, an anode of the first bootstrap diode is connected to a low voltage power supply of the smart power module End, the cathode of the first bootstrap diode is connected to the smart work a U-phase high voltage region power supply positive terminal of the rate module; a second bootstrap diode, an anode of the second bootstrap diode connected to a low voltage region power supply positive terminal of the smart power module, and a second bootstrap diode a cathode is connected to the positive end of the V-phase high voltage power supply of the smart power module; a third bootstrap diode, an anode of the third bootstrap diode is connected to a positive end of the low voltage power supply of the intelligent power module, The cathode of the third bootstrap diode is connected to the positive end of the W-phase high voltage region power supply of the intelligent power module.

According to an embodiment of the fifth aspect of the present invention, there is also provided an air conditioner comprising: the intelligent power module as described in any of the above embodiments.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

FIG. 1 is a schematic structural diagram of an intelligent power module in the related art;

2 shows a schematic diagram of an external circuit of an intelligent power module;

FIG. 3 is a schematic diagram showing a waveform of a current signal triggering an intelligent power module to stop working;

FIG. 4 is a schematic diagram showing a waveform of noise generated by an intelligent power module in the related art;

FIG. 5 is a schematic diagram showing another waveform of noise generated by the intelligent power module in the related art;

6 is a block diagram showing the structure of an intelligent power module according to a first embodiment of the present invention;

FIG. 7 is a schematic diagram showing the internal structure of the adaptive circuit shown in FIG. 6;

Figure 8 is a block diagram showing the internal structure of the PFC freewheeling circuit shown in Figure 6;

FIG. 9 is a block diagram showing the structure of an intelligent power module according to a second embodiment of the present invention; FIG.

FIG. 10 is a block diagram showing the internal structure of the adaptive circuit shown in FIG. 9;

Figure 11 is a block diagram showing the internal structure of the PFC freewheeling circuit shown in Figure 9;

FIG. 12 is a block diagram showing the structure of an intelligent power module according to a third embodiment of the present invention; FIG.

FIG. 13 is a block diagram showing the internal structure of the adaptive circuit shown in FIG. 12;

Figure 14 is a block diagram showing the internal structure of the PFC freewheeling circuit shown in Figure 12;

FIG. 15 is a block diagram showing the structure of an intelligent power module according to a fourth embodiment of the present invention; FIG.

Figure 16 is a diagram showing the internal structure of the adaptive circuit shown in Figure 15;

Fig. 17 is a view showing the internal structure of the PFC freewheeling circuit shown in Fig. 15.

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a full understanding of the invention, but the invention may be practiced otherwise than as described herein. Limitations of the embodiments.

The structure and function of the intelligent power module proposed by the present invention are described in detail below with four embodiments:

Embodiment 1:

As shown in FIG. 6, the intelligent power module according to the first embodiment of the present invention includes: a HVIC tube 1101 and an adaptive circuit 1105.

The VCC end of the HVIC tube 1101 is used as the low-voltage area power supply positive terminal VDD of the smart power module 1100, and VDD is generally 15V;

Inside the HVIC tube 1101:

The ITRIP terminal is connected to the input end of the adaptive circuit 1105; the VCC terminal is connected to the positive power supply terminal of the adaptive circuit 1105; the GND terminal is connected to the negative power supply terminal of the adaptive circuit 1105; the first output of the adaptive circuit 1105 is denoted as ICON. For controlling the validity of the HIN1~HIN3, LIN1~LIN3, PFCINP signals; the second output of the adaptive circuit 1105 is connected to the PFCC terminal of the HVIC tube 1101.

The bootstrap circuit structure inside the HVIC tube 1101 is as follows:

The VCC terminal is connected to the bootstrap diode 1102, the bootstrap diode 1103, and the anode of the bootstrap diode 1104; the cathode of the bootstrap diode 1102 is connected to the VB1 of the HVIC tube 1101; the cathode of the bootstrap diode 1103 is connected to the VB2 of the HVIC tube 1101; The cathode of the diode 1104 is connected to VB3 of the HVIC tube 1101.

The HIN1 end of the HVIC tube 1101 is the U-phase upper arm signal transmission of the intelligent power module 1100. The UIN terminal of the HVIC tube 1101 is the V-phase upper arm signal input end VHIN of the intelligent power module 1100; the HIN3 end of the HVIC tube 1101 is the W-phase upper arm signal input end WHIN of the intelligent power module 1100; the HVIC tube The LIN1 end of 1101 is the U-phase lower arm signal input terminal ULIN of the intelligent power module 1100; the LIN2 end of the HVIC tube 1101 is the V-phase lower arm signal input end VLIN of the intelligent power module 1100; the LIN3 end of the HVIC tube 1101 is intelligent. The W-phase lower arm signal input terminal WLIN of the power module 1100; the ITRIP end of the HVIC tube 1101 is the MTRIP end of the intelligent power module 1100; the PFCINP end of the HVIC tube 1101 is the PFC control input terminal PFCIN of the intelligent power module 1100; the HVIC tube 1101 The GND terminal serves as the low-voltage power supply negative terminal COM of the intelligent power module 1100. Among them, the intelligent power module 1100 UHIN, VHIN, WHIN, ULIN, VLIN, WLIN six input and PFCIN terminal receive 0V or 5V input signal.

The VB1 end of the HVIC tube 1101 is connected to one end of the capacitor 1131 and serves as the U-phase high voltage region power supply positive terminal UVB of the intelligent power module 1100; the HO1 end of the HVIC tube 1101 is connected to the gate of the U-phase upper arm IGBT tube 1121; HVIC The VS1 end of the tube 1101 is connected to the emitter of the IGBT tube 1121, the anode of the FRD tube 1111, the collector of the U-phase lower arm IGBT tube 1124, the cathode of the FRD tube 1114, and the other end of the capacitor 1131, and serves as the intelligent power module 1100. The U-phase high-voltage zone power supply negative terminal UVS.

The VB2 end of the HVIC tube 1101 is connected to one end of the capacitor 1132, and serves as the V-phase high voltage area power supply positive terminal VVB of the intelligent power module 1100; the HO2 end of the HVIC tube 1101 is connected to the gate of the V-phase upper arm IGBT tube 1123; HVIC The VS2 end of the tube 1101 is connected to the emitter of the IGBT tube 1122, the anode of the FRD tube 1112, the collector of the V-phase lower arm IGBT tube 1125, the cathode of the FRD tube 1115, and the other end of the capacitor 1132, and serves as the intelligent power module 1100. The V-phase high voltage area power supply negative terminal VVS.

The VB3 end of the HVIC tube 1101 is connected to one end of the capacitor 1133 as the W-phase high-voltage area power supply positive terminal WVB of the intelligent power module 1100; the HO3 end of the HVIC tube 1101 is connected to the gate of the W-phase upper arm IGBT tube 1123; the HVIC tube The VS3 end of 1101 is connected to the emitter of the IGBT tube 1123, the anode of the FRD tube 1113, the collector of the W-phase lower arm IGBT tube 1126, the cathode of the FRD tube 1116, and the other end of the capacitor 1133, and serves as the smart power module 1100. W phase high voltage area power supply negative terminal WVS.

The LO1 end of the HVIC tube 1101 is connected to the gate of the IGBT tube 1124; the HVIC tube 1101 The LO2 end is connected to the gate of the IGBT tube 1125; the LO3 end of the HVIC tube 1101 is connected to the gate of the IGBT tube 1126; the emitter of the IGBT tube 1124 is connected to the anode of the FRD tube 1114, and serves as the U phase of the intelligent power module 1100. The low voltage reference terminal UN; the emitter of the IGBT transistor 1125 is connected to the anode of the FRD tube 1115 and serves as the V-phase low voltage reference terminal VN of the smart power module 1100; the emitter of the IGBT transistor 1126 is connected to the anode of the FRD tube 1116, and As the W-phase low voltage reference terminal WN of the smart power module 1100.

VDD is the positive terminal of the power supply of HVIC tube 1101, GND is the negative terminal of the power supply of HVIC tube 1101; VDD-GND voltage is generally 15V; VB1 and VS1 are the positive and negative poles of the power supply of U-phase high-voltage zone, respectively, HO1 is U-phase high voltage The output of the zone; VB2 and VS2 are the positive and negative poles of the power supply of the V-phase high-voltage zone, and HO2 is the output of the V-phase high-voltage zone; VB3 and VS3 are the positive and negative poles of the power supply of the U-phase high-voltage zone, respectively, and HO3 is W The output of the phase high voltage region; LO1, LO2, and LO3 are the output terminals of the U phase, the V phase, and the W phase low voltage region, respectively.

The PFCO end of the HVIC tube 1101 is the output end of the PFC driving circuit, and is connected to the gate of the IGBT tube 1127; the emitter of the IGBT tube 1127 is connected to the anode of the FRD tube 1117, and serves as the PFC low voltage reference end of the intelligent power module 1100-VP. The collector of the IGBT tube 1127 is connected to the cathode of the FRD tube 1117, the first input and output of the adaptive PFC freewheeling circuit 1141, and serves as the PFC end of the intelligent power module 1100, and the PFCC terminal is connected to the adaptive PFC freewheeling circuit 1141. Input.

The second input and output end of the adaptive PFC freewheeling circuit 1141, the collector of the IGBT tube 1121, the cathode of the FRD tube 1111, the collector of the IGBT tube 1122, the cathode of the FRD tube 1112, the collector of the IGBT tube 1123, and the FRD tube 1113 The cathode is connected and serves as the high voltage input terminal P of the intelligent power module 1100, and the P is generally connected to 300V.

The role of HVIC tube 1101 is:

When ICON is high, the 0 or 5V logic input signals of the input terminals HIN1, HIN2, and HIN3 are respectively transmitted to the output terminals HO1, HO2, and HO3, and the signals of LIN1, LIN2, and LIN3 are respectively transmitted to the output terminals LO1 and LO2. LO3, the signal of PFCINP is transmitted to the output terminal PFCO, where HO1 is the logic output signal of VS1 or VS1+15V, HO2 is the logic output signal of VS2 or VS2+15V, and HO3 is the logic output signal of VS3 or VS3+15V, LO1, LO2, LO3, PFCO are 0 or 15V logic output signals;

When ICON is low, HO1, HO2, HO3, LO1, LO2, LO3, PFCO All are set low.

The role of the adaptive circuit 1105 is:

When the temperature is lower than a certain temperature value T1, PFCC outputs a low level, and if the real-time value of ITRIP is greater than a certain voltage value V1, ICON outputs a low level, otherwise ICON outputs a high level;

When the temperature is higher than a certain temperature value T1, PFCC outputs a high level, and if the real-time value of ITRIP is greater than a certain voltage value V2, ICON outputs a low level, otherwise ICON outputs a high level; wherein, V2> V1.

The role of the adaptive PFC freewheeling circuit 1141 is:

When the PFCC is low, the adaptive PFC freewheeling circuit 1141 is an FRD tube with a low forward voltage drop and a slow reverse recovery time;

When PFCC is high, the adaptive PFC freewheeling circuit 1141 is an FRD tube with a high forward voltage drop and a fast reverse recovery time.

In the first embodiment, specifically, the specific circuit structure of the adaptive circuit 1105 is as shown in FIG. 7, specifically:

One end of the resistor 2016 is connected to VCC; the other end of the resistor 2016 is connected to one end of the resistor 2013 and the cathode of the Zener diode 2011; the other end of the resistor 2013 is connected to one end of a PTC (Positive Temperature Coefficient) resistor 2012, and the voltage comparator 2015 Positive input terminal; the other end of Zener diode 2011 is connected to GND; the other end of PTC resistor 2012 is connected to GND; the negative input terminal of voltage comparator 2015 is connected to the positive terminal of voltage source 2014; the negative terminal of voltage source 2014 is connected to GND; The output terminal of the comparator 2015 is connected to the other input terminal of the NOT gate 2017; the output terminal of the NOT gate 2017 is connected to the input terminal of the NOT gate 2027; the output terminal of the NOT gate 2027 is connected to the control terminal of the analog switch 2022 and serves as the adaptive circuit 1105. The second output end, that is, the PFCC end;

ITRIP is connected to the positive input terminal of the voltage comparator 2010, the positive input terminal of the voltage comparator 2023; the negative input terminal of the voltage comparator 2010 is connected to the positive terminal of the voltage source 2018; the negative terminal of the voltage source 2018 is connected to the GND;

The negative input terminal of the voltage comparator 2023 is connected to the positive terminal of the voltage source 2019; the negative terminal of the voltage source 2019 is connected to the GND;

The output of the voltage comparator 2010 is connected to one of the inputs of the NAND gate 2025 and the analog is turned on. The output terminal of the voltage comparator 2023 is connected to one of the input terminals of the NAND gate 2025; the output terminal of the NAND gate 2025 is connected to the input terminal of the NOT gate 2026; the output terminal of the NOT gate 2026 is connected to the analog switch 2022. The 1 select terminal; the fixed end of the analog switch 2022 is connected to the input of the NOT gate 2020; the output of the NOT gate 2020 is used as the ICON.

Specifically, the specific circuit structure of the PFC freewheeling circuit 1141 is as shown in FIG. 8 , specifically:

The input end of the PFC freewheeling circuit 1141 is connected to the control end of the analog switch 2003 and the control end of the analog switch 2004; the fixed end of the analog switch 2003 is the first input and output end of the PFC freewheeling circuit 1141; the fixed end of the analog switch 2004 is Is a second input and output end of the PFC freewheeling circuit 1141;

The 1 of the analog switch 2003 is selectively terminated to the cathode of the FRD tube 2001; the 0 of the analog switch 2003 is selectively terminated to the cathode of the FRD terminal 2002; the 1 of the analog switch 2004 is selectively terminated to the anode of the FRD terminal 2001; the 0 of the analog switch 2004 is selectively terminated. The anode of the FRD tube 2002.

The working principle and key parameters of the first embodiment are described below:

The Zener diode 2011 clamp voltage is designed to be 6.4V, and the resistor 2016 is designed to be 20kΩ, which produces a stable 6.4V voltage that does not affect the VCC voltage fluctuation at point B. The PTC resistor 2012 is designed to be 10kΩ at 25°C, at 100°C. 20kΩ; resistor 2013 is designed to be 44kΩ, voltage source 2014 is designed to be 2V, then below 100°C, voltage comparator 2015 outputs low level, above 100°C, voltage comparator 2015 outputs high level.

Thus, if and only if the temperature is greater than 100 ° C, the NOT gate 2027 outputs a high level, otherwise the NOT gate 2027 outputs a low level.

The voltage source 2018 is designed to be 0.5V, and the voltage source 2019 is designed to be 0.6V;

When the NOT gate 2027 outputs a low level, the voltage of the ITRIP is compared with the voltage of the voltage source 2018. When the ITRIP voltage is >0.5V, the voltage comparator 2010 outputs a high level and causes ICON to generate a low level to stop the module from operating; and, At this time, the first input and output end of the PFC freewheeling circuit 1141 is connected to the cathode of the PFC tube 2002, and the second input and output end of the PFC freewheeling circuit 1141 is connected to the anode of the PFC tube 2002;

When the NOT gate 2027 outputs a high level, ITRIP is simultaneously compared with the voltage of 0.5V and 0.6V. Because the voltage is increasing, the voltage of ITRIP reaches 0.5V, and it needs to continue to rise for a period of time to reach 0.6V. Therefore, even if the voltage of ITRIP is > 0.5V, it will take a while for the voltage comparator 2010 and the voltage comparator 2023 to output a high level to make the NAND gate 2025 output low. Flat, this duration depends on the rising slope of ITRIP; and, at this time, the first input and output of the PFC freewheeling circuit 1141 is connected to the cathode of the PFC tube 2001, and the second input and output of the PFC freewheeling circuit 1141 and the PFC tube The anode of 2001 is connected.

The NAND gate 2025 and the NOT gate 2026 take four times the minimum size allowed by the process, and can generate a delay of 60 to 100 ns, thereby increasing the response time of the ICON to the ITRIP.

Under the same process, by adjusting the concentration of platinum, adjusting the relationship between the reverse recovery time of the FRD tube and the forward voltage drop, the FRD tube 2001 and the FRD tube 2002 are obtained, and the FRD tube 2001 can select the FRD tube with a short reverse recovery time. The FRD tube 2002 selects an FRD tube with a small forward pressure drop.

It can be seen that, based on the technical solution of the first embodiment, when the temperature is low, the ITRIP is compared with a lower voltage to ensure the sensitivity to the overcurrent protection of the intelligent power module. When the temperature is high, the ITRIP is higher with a higher temperature. Voltage comparison, taking into account the stability of the intelligent power module operation; and, at lower temperatures, the PFC circuit uses a FRD tube with a lower forward voltage drop to achieve lower power consumption, and at higher temperatures, the PFC uses reverse The FRD tube with shorter recovery time reduces the voltage noise of the circuit; thus, the intelligent power module of the invention maintains the stability of the system under the premise that the normal protection mechanism continues to be effective, and at the same time improves the user satisfaction of the product.

Embodiment 2:

As shown in FIG. 9, an intelligent power module according to a second embodiment of the present invention includes: a HVIC tube 1101' and an adaptive circuit 1105'.

The VCC end of the HVIC tube 1101' serves as the low voltage region of the intelligent power module 1100'. The power supply positive terminal VDD, VDD is generally 15V;

Inside the HVIC tube 1101':

The ITRIP terminal is connected to the first input end of the adaptive circuit 1105'; the PFCINP terminal is connected to the second input end of the adaptive circuit 1105'; the VCC terminal is connected to the power supply positive terminal of the adaptive circuit 1105'; and the GND terminal is connected to the adaptive circuit 1105'. The negative end of the power supply; the first output of the adaptive circuit 1105' is denoted as ICON for controlling the validity of the HIN1~HIN3, LIN1~LIN3, PFCINP signals; the second output of the adaptive circuit 1105' is coupled to the HVIC The PFCC1 terminal of the transistor 1101'; the third output of the adaptive circuit 1105' is coupled to the PFCC2 terminal of the HVIC transistor 1101'.

The bootstrap circuit structure inside the HVIC tube 1101' is as follows:

VCC terminal and bootstrap diode 1102', bootstrap diode 1103', bootstrap diode 1104' The anode is connected; the cathode of the bootstrap diode 1102' is connected to VB1 of the HVIC tube 1101'; the cathode of the bootstrap diode 1103' is connected to VB2 of the HVIC tube 1101'; the cathode of the bootstrap diode 1104' is connected to the VB3 of the HVIC tube 1101' .

The HIN1 end of the HVIC tube 1101' is the U-phase upper arm signal input end UHIN of the intelligent power module 1100'; the HIN2 end of the HVIC tube 1101' is the V-phase upper arm signal input end VHIN of the intelligent power module 1100'; the HVIC tube The HIN3 end of 1101' is the W-phase upper arm signal input terminal WHIN of the intelligent power module 1100'; the LIN1 end of the HVIC tube 1101' is the U-phase lower arm signal input terminal ULIN of the intelligent power module 1100'; the HVIC tube 1101' The LIN2 end is the V-phase lower arm signal input end VLIN of the intelligent power module 1100'; the LIN3 end of the HVIC tube 1101' is the W-phase lower arm signal input end WLIN of the intelligent power module 1100'; the ITRIP of the HVIC tube 1101' The end is the MTRIP end of the intelligent power module 1100'; the PFCINP end of the HVIC tube 1101' is used as the PFC control input terminal PFCIN of the intelligent power module 1100'; the GND end of the HVIC tube 1101' is used as the low voltage area power supply of the intelligent power module 1100'. End COM. Among them, the UHIN, VHIN, WHIN, ULIN, VLIN, WLIN six inputs and the PFCIN terminal of the intelligent power module 1100' receive an input signal of 0V or 5V.

The VB1 end of the HVIC tube 1101' is connected to one end of the capacitor 1131', and serves as the U-phase high voltage area power supply positive terminal UVB of the intelligent power module 1100'; the HO1 end of the HVIC tube 1101' and the U-phase upper arm IGBT tube 1121' The gate is connected; the VS1 end of the HVIC tube 1101' and the emitter of the IGBT tube 1121', the anode of the FRD tube 1111', the collector of the U-phase lower arm IGBT tube 1124', the cathode of the FRD tube 1114', and the capacitor 1131' The other end is connected and serves as the U-phase high voltage zone of the intelligent power module 1100'.

The VB2 end of the HVIC tube 1101' is connected to one end of the capacitor 1132', and serves as the V-phase high voltage region power supply positive terminal VVB of the intelligent power module 1100'; the HO2 terminal of the HVIC tube 1101' and the V-phase upper arm IGBT tube 1123' The gate is connected; the VS2 end of the HVIC tube 1101' and the emitter of the IGBT tube 1122', the anode of the FRD tube 1112', the collector of the V-phase lower arm IGBT tube 1125', the cathode of the FRD tube 1115', and the capacitor 1132' The other end is connected and serves as the V-phase high voltage power supply negative terminal VVS of the intelligent power module 1100'.

The VB3 end of the HVIC tube 1101' is connected to one end of the capacitor 1133' as the W-phase high voltage area power supply positive terminal WVB of the intelligent power module 1100'; the HO3 end of the HVIC tube 1101' and the gate of the W-phase upper arm IGBT tube 1123' Very connected; VS3 end of HVIC tube 1101' and IGBT tube The emitter of 1123', the anode of the FRD tube 1113', the collector of the W-phase lower arm IGBT tube 1126', the cathode of the FRD tube 1116', and the other end of the capacitor 1133' are connected as the smart power module 1100'. Phase high voltage zone power supply negative terminal WVS.

The LO1 end of the HVIC tube 1101' is connected to the gate of the IGBT tube 1124'; the LO2 end of the HVIC tube 1101' is connected to the gate of the IGBT tube 1125'; the LO3 end of the HVIC tube 1101' is connected to the gate of the IGBT tube 1126'. The emitter of the IGBT tube 1124' is connected to the anode of the FRD tube 1114' and serves as the U-phase low voltage reference terminal UN of the smart power module 1100'; the emitter of the IGBT tube 1125' is connected to the anode of the FRD tube 1115', and As the V-phase low voltage reference terminal VN of the smart power module 1100'; the emitter of the IGBT transistor 1126' is connected to the anode of the FRD tube 1116' and serves as the W-phase low voltage reference terminal WN of the smart power module 1100'.

VDD is the positive terminal of the power supply of HVIC tube 1101', GND is the negative terminal of the power supply of HVIC tube 1101'; VDD-GND voltage is generally 15V; VB1 and VS1 are the positive and negative poles of the power supply of U-phase high-voltage zone, respectively, HO1 is U The output of the phase high voltage region; VB2 and VS2 are the positive and negative poles of the power supply of the V phase high voltage region, HO2 is the output end of the V phase high voltage region; VB3 and VS3 are the positive and negative poles of the power source of the U phase high voltage region, respectively, HO3 It is the output end of the W-phase high-voltage zone; LO1, LO2, and LO3 are the output ends of the U-phase, V-phase, and W-phase low-voltage zones, respectively.

The PFCO end of the HVIC tube 1101' is the output of the PFC driving circuit, connected to the gate of the IGBT tube 1127'; the emitter of the IGBT tube 1127' is connected to the anode of the FRD tube 1117', and the PFC of the smart power module 1100' is low. The voltage reference terminal - VP; the collector of the IGBT transistor 1127' is connected to the cathode of the FRD transistor 1117', the first input and output of the adaptive PFC freewheeling circuit 1141', and serves as the PFC terminal of the smart power module 1100', the PFCC1 terminal The first input of the adaptive PFC freewheeling circuit 1141' is connected; the PFCC2 terminal is connected to the second input of the adaptive PFC freewheeling circuit 1141'.

The second input and output end of the adaptive PFC freewheeling circuit 1141', the collector of the IGBT tube 1121', the cathode of the FRD tube 1111', the collector of the IGBT tube 1122', the cathode of the FRD tube 1112', and the IGBT tube 1123' The collector, the cathode of the FRD tube 1113' is connected, and serves as the high voltage input terminal P of the smart power module 1100', and the P is generally connected to 300V.

The role of HVIC tube 1101' is:

When ICON is high, the 0 or 5V logic input signals of the input terminals HIN1, HIN2, and HIN3 are respectively transmitted to the output terminals HO1, HO2, and HO3, and the LIN1, LIN2, and LIN3 are respectively The signals are respectively transmitted to the output terminals LO1, LO2, and LO3, and the signals of the PFCINP are transmitted to the output terminal PFCO, where HO1 is the logic output signal of VS1 or VS1+15V, HO2 is the logic output signal of VS2 or VS2+15V, and HO3 is VS3. Or VS3+15V logic output signal, LO1, LO2, LO3, PFCO is a logic output signal of 0 or 15V;

When ICON is low, HO1, HO2, HO3, LO1, LO2, LO3, and PFCO are all set low.

The role of the adaptive circuit 1105' is:

When the temperature is lower than a certain temperature value T1, PFCC1 is low level, and if the real-time value of ITRIP is greater than a certain voltage value V1, ICON outputs a low level, otherwise ICON outputs a high level;

When the temperature is higher than a certain temperature value T1, PFCC1 is high level, and if the real-time value of ITRIP is greater than a certain voltage value V2, ICON outputs a low level, otherwise ICON outputs a high level; wherein, V2> V1;

PFCC2 outputs a high level for a short period of time after the rising edge of PFCINP occurs;

The PFCC2 outputs a low level for the rest of the time after the rising edge of PFCINP.

The role of the adaptive PFC freewheeling circuit 1141' is:

When at least one of PFCC1 and PFCC2 is at a low level, the adaptive PFC freewheeling circuit 1141' has the characteristics of a FRD tube having a low forward voltage drop and a large reverse recovery current;

When both PFCC1 and PFCC2 are simultaneously high, the adaptive PFC freewheeling circuit 1141' has the characteristics of a reverse recovery current controlled high voltage resistant FRD tube.

In the second embodiment, specifically, the specific circuit structure of the adaptive circuit 1105' is as shown in FIG. 10, specifically:

PFCINP connects the input of the non-gate 2001', the non-gate 2003'; the output of the non-gate 2001' is connected to the input of the non-gate 2002'; the output of the non-gate 2003' is connected to the end of the capacitor 2008', the non-gate 2004' The output end of the non-gate 2004' is connected to one end of the capacitor 2009', the input end of the non-gate 2005'; the other end of the capacitor 2008' is connected to the GND; the other end of the capacitor 2009' is connected to the GND;

The output of the NOT gate 2002' is connected to one of the inputs of the NAND gate 2006'; the output of the NOT gate 2005' is connected to the other input of the NAND gate 2006'; the output of the NAND gate 2006' is NAND gate 2007. The input end of the non-gate 2007' is the third output end of the adaptive circuit 1105', that is, the PFCC2 end of the HVIC tube 1101';

One end of the resistor 2016' is connected to VCC; the other end of the resistor 2016' is connected to one end of the resistor 2013' and the cathode of the Zener diode 2011'; the other end of the resistor 2013' is connected to a PTC (Positive Temperature Coefficient) resistor 2012' One end, the positive input terminal of the voltage comparator 2015'; the other end of the Zener diode 2011' is connected to GND; the other end of the PTC resistor 2012' is connected to the GND; the negative input terminal of the voltage comparator 2015' is connected to the positive terminal of the voltage source 2014' The negative terminal of voltage source 2014' is connected to GND; the output of voltage comparator 2015' is connected to the other input of NOT gate 2017'; the output of non-gate 2017' is connected to the input of non-gate 2027'; non-gate 2027' The output end is connected to the control end of the analog switch 2022' and serves as the second output end of the adaptive circuit 1105', that is, the PFCC1 end of the HVIC tube 1101';

ITRIP is connected to the positive input terminal of the voltage comparator 2010', the positive input terminal of the voltage comparator 2023'; the negative input terminal of the voltage comparator 2010' is connected to the positive terminal of the voltage source 2018'; the negative terminal of the voltage source 2018' is connected to the GND;

The negative input terminal of the voltage comparator 2023' is connected to the positive terminal of the voltage source 2019'; the negative terminal of the voltage source 2019' is connected to the GND;

The output of the voltage comparator 2010' is connected to one of the input terminals of the NAND gate 2025' and the 0 selection terminal of the analog switch 2022'; the output of the voltage comparator 2023' is connected to one of the inputs of the NAND gate 2025'; The output terminal of the NOT gate 2025' is connected to the input terminal of the NOT gate 2026'; the output terminal of the NOT gate 2026' is connected to the 1 selection terminal of the analog switch 2022'; the fixed terminal of the analog switch 2022' is connected to the input terminal of the NOT gate 2020'; The output of the gate 2020' acts as ICON, the first output of the adaptive circuit 1105';

The PFCC1 end is connected to the first input end of the PFC freewheeling circuit 1141', and the PFCC 2' end is connected to the second input end of the PFC freewheeling circuit 1141'.

In the second embodiment, specifically, the specific circuit structure of the PFC freewheeling circuit 1141' is as shown in FIG. 11, specifically:

The first input of the PFC freewheeling circuit 1141' is connected to one of the inputs of the NAND gate 2030'; the second input of the PFC freewheeling circuit 1141' is connected to the other input of the NAND gate 2030'; the NAND gate 2030 The output of the non-gate 2029' is connected to the output of the non-gate 2029'; the output of the non-gate 2029' is connected to the control end of the analog switch 2024';

A select terminal of the analog switch 2024' is coupled to one end of the resistor 2028' and serves as a first input and output terminal of the PFC freewheeling circuit 1141'; the 0 select terminal of the analog switch 2024' is coupled to another resistor 2028'. The fixed end of the analog switch 2004' is connected to the cathode of the FRD tube 2021'; the anode of the FRD tube 2021' is the second input and output of the PFC freewheeling circuit 1141'.

The working principle and key parameters of the second embodiment are described below:

On the rising edge of PFCINP, the A' point shown in Fig. 10 generates a pulse whose width is determined by the values of NOT gate 2003', NOT gate 2004', NOT gate 2005' and capacitance 2008', capacitance 2009'. The non-gate 2003' can select the minimum size allowed by the process. The non-gate 2004', the non-gate 2005' can consider the selection of the minimum size allowed by the process, and the capacitance 2008' and the capacitance 2009' can be between 5pF and 10pF. The pulse generated at the point A' has a pulse width of 200 ns to 250 ns.

The Zener diode 2011' clamp voltage is designed to be 6.4V, and the resistor 2016' is designed to be 20kΩ, which produces a stable 6.4V voltage at the B' point that does not affect the VCC voltage fluctuations; the PTC resistor 2012' is designed to be 10kΩ at 25°C. 20kΩ at 100°C; 44kΩ for resistor 2013′, 2V for voltage source 2014′, below 100°C, voltage comparator 2015' output low level, above 100°C, voltage comparator 2015' output high power level.

Thus, if and only if the temperature is greater than 100 ° C, the NOT gate 2027' outputs a high level, otherwise the NOT gate 2027' outputs a low level.

The voltage source 2018' is designed to be 0.5V, and the voltage source 2019' is designed to be 0.6V;

When the NOT gate 2027' outputs a low level, the voltage of the ITRIP is compared with the voltage of the voltage source 2018'. When the ITRIP voltage is >0.5V, the voltage comparator 2010' outputs a high level and causes ICON to generate a low level to stop the module from operating. ;

When the NOT gate 2027' outputs a high level, ITRIP is simultaneously compared with the voltage of 0.5V and 0.6V. Because the voltage is increasing, the voltage of ITRIP reaches 0.5V, and it needs to continue to rise for a period of time to reach 0.6V. Therefore, even the voltage of ITRIP >0.5V, it will take a while for the voltage comparator 2010' and the voltage comparator 2023' to output a high level to make the NAND gate 2025' output a low level, which depends on the rising slope of ITRIP;

When the rising edge of PFCINP is between 200ns and 250ns, the non-gate 2007' outputs a high level. When the temperature is above 100°C: the cathode of the FRD tube 2021' is connected to one end of the resistor 2028', and the other end of the resistor 2028' is connected. The first input and output end of the PFC freewheeling circuit 1141', the anode of the FRD tube 2021' is connected to the second input and output end of the PFC freewheeling circuit 1141'; the resistor 2028' can use an ohmic resistor with a power of 50W or more, the resistor 2028' Intervention, which extends the reverse recovery time but limits the reverse recovery current and suppresses the bus induced voltage. The power consumption of 200 ns to 250 ns in a very short time does not affect the performance of the intelligent power module proposed by the present invention;

After the rising edge of PFCINP, or when the temperature is below 100 ° C, the cathode of FRD tube 2021' is directly connected to the first input and output of PFC freewheeling circuit 1141', and the anode of FRD tube 2021' is connected to PFC freewheeling circuit 1141' The second input and output terminals are general FRD tube characteristics.

It can be seen that, based on the technical solution of the second embodiment, when the temperature is low, the ITRIP is compared with a lower voltage to ensure the sensitivity to the overcurrent protection of the intelligent power module. When the temperature is high, the ITRIP is higher with a higher Voltage comparison, taking into account the stability of the intelligent power module operation; and, when the temperature is low, the PFC circuit uses a FRD tube with a lower forward voltage drop to achieve lower power consumption, and when the temperature is higher, the rise in PFCINP Along the edge, the reverse recovery current of the PFC is controlled to suppress its influence on the bus voltage; thus, the intelligent power module of the present invention maintains the stability of the system while improving the stability of the system while the normal protection mechanism continues to be effective. customer satisfaction.

Embodiment 3:

As shown in FIG. 12, an intelligent power module according to a third embodiment of the present invention includes: a HVIC tube 1101" and an adaptive circuit 1105".

The VCC end of the HVIC tube 1101" is used as the low voltage area power supply positive terminal VDD of the smart power module 1100", and VDD is generally 15V;

Inside the HVIC tube 1101":

The ITRIP end is connected to the first input end of the adaptive circuit 1105"; the VCC end is connected to the positive end of the power supply of the adaptive circuit 1105"; the GND end is connected to the negative end of the power supply of the adaptive circuit 1105"; the output of the adaptive circuit 1105" It is denoted as ICON for controlling the validity of the HIN1~HIN3, LIN1~LIN3, PFCINP signals; the second input of the adaptive circuit 1105" is connected to the PFCC terminal of the HVIC tube 1101".

The bootstrap circuit structure inside the HVIC tube 1101" is as follows:

The VCC terminal is connected to the bootstrap diode 1102", the bootstrap diode 1103", and the anode of the bootstrap diode 1104"; the cathode of the bootstrap diode 1102" is connected to VB1 of the HVIC transistor 1101"; the cathode of the bootstrap diode 1103" and the HVIC tube The 1101" VB2 is connected; the cathode of the bootstrap diode 1104" is connected to VB3 of the HVIC tube 1101".

The HIN1 end of the HVIC tube 1101" is the U-phase upper arm signal transmission of the intelligent power module 1100" The UIN terminal of the HVIC tube 1101" is the V-phase upper arm signal input end VHIN of the intelligent power module 1100"; the HIN3 end of the HVIC tube 1101" is the W-phase upper arm signal input end of the intelligent power module 1100" WHIN; LIN1 end of HVIC tube 1101" is U-phase lower arm signal input terminal ULIN of intelligent power module 1100"; LIN2 end of HVIC tube 1101" is V-phase lower arm signal input end VLIN of intelligent power module 1100"; The LIN3 end of the HVIC tube 1101" is the W-phase lower arm signal input terminal WLIN of the intelligent power module 1100"; the ITRIP end of the HVIC tube 1101" is the MTRIP end of the intelligent power module 1100"; the PFCINP end of the HVIC tube 1101" is used as the smart The PFC control input terminal PFCIN of the power module 1100"; the GND terminal of the HVIC tube 1101" serves as the low voltage region power supply negative terminal COM of the smart power module 1100". Among them, the intelligent power module 1100" UHIN, VHIN, WHIN, ULIN, VLIN, WLIN six input and PFCIN end receive 0V or 5V input signal.

The VB1 end of the HVIC tube 1101" is connected to one end of the capacitor 1131", and serves as the U-phase high-voltage region power supply positive terminal UVB of the intelligent power module 1100"; the HO1 terminal of the HVIC tube 1101" and the U-phase upper arm IGBT tube 1121" The gate is connected; the VS1 end of the HVIC tube 1101" and the emitter of the IGBT tube 1121", the anode of the FRD tube 1111", the collector of the U-phase lower arm IGBT tube 1124", the cathode of the FRD tube 1114", and the capacitor 1131" The other end is connected and serves as the U-phase high voltage zone of the intelligent power module 1100".

The VB2 end of the HVIC tube 1101" is connected to one end of the capacitor 1132", and serves as the V-phase high voltage region power supply positive terminal VVB of the intelligent power module 1100"; the HO2 terminal of the HVIC tube 1101" and the V-phase upper arm IGBT tube 1123" The gate is connected; the VS2 end of the HVIC tube 1101" and the emitter of the IGBT tube 1122", the anode of the FRD tube 1112", the collector of the V-phase lower arm IGBT tube 1125", the cathode of the FRD tube 1115", and the capacitor 1132" The other end is connected and serves as the V-phase high voltage area of the intelligent power module 1100".

The VB3 end of the HVIC tube 1101" is connected to one end of the capacitor 1133" as the W-phase high-voltage area power supply positive terminal WVB of the intelligent power module 1100"; the HO3 end of the HVIC tube 1101" and the gate of the W-phase upper arm IGBT tube 1123" The pole is connected; the VS3 end of the HVIC tube 1101" and the emitter of the IGBT tube 1123", the anode of the FRD tube 1113", the collector of the W-phase lower arm IGBT tube 1126", the cathode of the FRD tube 1116", and the capacitor 1133" The other end is connected and serves as the W-phase high-voltage zone power supply negative terminal WVS of the intelligent power module 1100".

The LO1 end of the HVIC tube 1101" is connected to the gate of the IGBT tube 1124"; the HVIC tube The LO2 end of the 1101" is connected to the gate of the IGBT tube 1125"; the LO3 end of the HVIC tube 1101" is connected to the gate of the IGBT tube 1126"; the emitter of the IGBT tube 1124" is connected to the anode of the FRD tube 1114" and serves as The U-phase low voltage reference terminal UN of the intelligent power module 1100"; the emitter of the IGBT tube 1125" is connected to the anode of the FRD tube 1115", and serves as the V-phase low voltage reference terminal VN of the intelligent power module 1100"; the IGBT tube 1126" The emitter is connected to the anode of the FRD tube 1116" and acts as the W-phase low voltage reference terminal WN of the smart power module 1100".

VDD is the positive terminal of the HVIC tube 1101" power supply, GND is the negative terminal of the power supply of the HVIC tube 1101"; the VDD-GND voltage is generally 15V; VB1 and VS1 are the positive and negative terminals of the U-phase high voltage region, respectively, HO1 is U The output of the phase high voltage region; VB2 and VS2 are the positive and negative poles of the power supply of the V phase high voltage region, HO2 is the output end of the V phase high voltage region; VB3 and VS3 are the positive and negative poles of the power source of the U phase high voltage region, respectively, HO3 It is the output end of the W-phase high-voltage zone; LO1, LO2, and LO3 are the output ends of the U-phase, V-phase, and W-phase low-voltage zones, respectively.

The PFCO end of the HVIC tube 1101" is connected to the gate of the IGBT tube 1127"; the emitter of the IGBT tube 1127" is connected to the anode of the FRD tube 1117", and serves as the PFC low voltage reference terminal of the intelligent power module 1100"-VP; The collector of the tube 1127" is connected to the first input and output of the cathode of the FRD tube 1117", the adaptive PFC freewheeling circuit 1141", and serves as the PFC terminal of the intelligent power module 1100", and the PFCC terminal is connected to the adaptive PFC freewheeling circuit. The output of the 1141".

The second input and output end of the adaptive PFC freewheeling circuit 1141", the collector of the IGBT tube 1121", the cathode of the FRD tube 1111", the collector of the IGBT tube 1122", the cathode of the FRD tube 1112", and the IGBT tube 1123" The collector, the cathode of the FRD tube 1113" is connected, and serves as the high voltage input terminal P of the intelligent power module 1100", and P is generally connected to 300V.

The role of HVIC tube 1101" is:

When ICON is low, HO1, HO2, HO3, LO1, LO2, LO3, and PFCO are all set low.

The role of the adaptive PFC freewheeling circuit 1141" is:

When the temperature is lower than a certain temperature value T1, PFCC is low level; the adaptive PFC freewheeling circuit 1141" is an FRD tube with a low forward voltage drop and a slow reverse recovery time;

When the temperature is higher than a certain temperature value T1, PFCC is high level; the adaptive PFC freewheeling circuit 1141" is an FRD tube with a high forward voltage drop and a fast reverse recovery time.

The role of the adaptive circuit 1105" is:

When PFCC is low, if the real-time value of ITRIP is greater than a certain voltage value V1, then ICON outputs a low level, otherwise ICON outputs a high level;

When PFCC is high, if the real-time value of ITRIP is greater than a certain voltage value V2, then ICON outputs a low level, otherwise ICON outputs a high level; where V2>V1.

In the third embodiment, specifically, the specific circuit structure of the adaptive circuit 1105" is as shown in FIG. 13, specifically:

The first input terminal of the ITRIP (ie, the adaptive circuit 1105) is connected to the positive input terminal of the voltage comparator 2010", the positive input terminal of the voltage comparator 2023"; the negative input terminal of the voltage comparator 2010" is connected to the voltage source 2018" Positive terminal; the negative terminal of voltage source 2018" is connected to GND;

The negative input terminal of the voltage comparator 2023" is connected to the positive terminal of the voltage source 2019"; the negative terminal of the voltage source 2019" is connected to the GND;

The output of the voltage comparator 2010" is connected to one of the input terminals of the NAND gate 2025" and the 0 selection terminal of the analog switch 2022";

The output of the voltage comparator 2023" is connected to one of the inputs of the NAND gate 2025"; the output of the NAND gate 2025" is connected to the input of the NOT gate 2026"; the output of the NOT gate 2026" is connected to the analog switch 2022" 1 select terminal; the fixed terminal of the analog switch 2022" is connected to the input terminal of the NOT gate 2020"; the output terminal of the NOT gate 2020" is used as ICON; the control terminal of the analog switch 2022" is the second input terminal of the adaptive circuit 1105", Connected to the output of the adaptive PFC freewheeling circuit 1141".

In the third embodiment, specifically, the specific circuit structure of the PFC freewheeling circuit 1141" is as shown in FIG. 14, specifically:

One end of the resistor 2016" is connected to VCC; the other end of the resistor 2016" is connected to one end of the resistor 2013" and the cathode of the Zener diode 2011"; the other end of the resistor 2013" is connected to one end of the PTC resistor 2012", and the voltage comparator 2015" The other end of the Zener diode 2011" is connected to GND; the other end of the PTC resistor 2012" is connected to GND;

The negative input terminal of the voltage comparator 2015" is connected to the positive terminal of the voltage source 2014"; the negative terminal of the voltage source 2014" is connected to the GND; the output terminal of the voltage comparator 2015" is connected to the input terminal of the non-gate 2017"; The output terminal is connected to the input terminal of the NOT gate 2027"; the output terminal of the NOT gate 2027" is connected to the control terminal of the analog switch 2003" and the control terminal of the analog switch 2004", and serves as an output terminal of the adaptive PFC freewheeling circuit 1141";

The 1 of the analog switch 2003" is terminated to the cathode of the FRD tube 2001"; the 0 of the analog switch 2003" is selectively terminated to the cathode of the FRD tube 2002"; the 1 of the analog switch 2004" is terminated to the anode of the FRD tube 2001"; the analog switch 1" of the 2004" termination of the anode of the FRD tube 2002";

The fixed end of the analog switch 2003" is the first input and output of the adaptive PFC freewheeling circuit 1141"; the fixed end of the analog switch 2004" is the second input and output of the adaptive PFC freewheeling circuit 1141".

The working principle and key parameters of the third embodiment are described below:

The Zener diode 2011" clamp voltage is designed to be 6.4V, and the resistor 2016" is designed to be 20kΩ, which produces a stable 6.4V voltage that does not affect the VCC voltage fluctuation at the B" point shown in Figure 14; PTC resistor 2012" layout In the vicinity of the FRD tube 2001" and the FRD tube 2002", and the PTC resistor 2012" can be considered to be designed to be 10kΩ at 25°C, 20kΩ at 100°C; the resistor 2013” is designed to be 44kΩ, and the voltage source 2014” is designed to be 2V, then at 100°C. Below, the voltage comparator 2015" outputs a low level, after the non-gate 2017" and the non-gate 2027" output low level, above 100 °C, the voltage comparator 2015" outputs a high level, after the non-gate 2017" and non Gate 2027" output high level. Non-gate 2017" MOS tube size can be considered to be 1.5 times the minimum size allowed by the process, non-gate 2027" MOS tube size can be considered as non-gate 2017" MOS tube size 2 times.

When the temperature of the PTC resistor 2012" is greater than 100 ° C, the non-gate 2027" outputs a high level, and the cathode of the FRD tube 2001" is the first input and output end of the adaptive PFC freewheeling circuit 1141", the anode of the FRD tube 2001" That is, the second input and output end of the adaptive PFC freewheeling circuit 1141";

When the temperature of the PTC resistor 2012" is less than 100 °C, the NOT gate 2027" outputs a low level, and the cathode of the FRD tube 2002" is the first input and output end of the adaptive PFC freewheeling circuit 1141", the anode of the FRD tube 2002" That is, the second input and output of the adaptive PFC freewheeling circuit 1141".

Under the same process, by adjusting the concentration of platinum, adjusting the relationship between the reverse recovery time of the FRD tube and the forward pressure drop, the FRD tube 2001" and the FRD tube 2002" are obtained, and the FRD tube 2001" can select a shorter reverse recovery time. FRD tube to make adaptive PFC freewheeling circuit 1141" at high temperature It can still maintain a short reverse recovery time and reduce the voltage interference to the circuit. The FRD tube 2002" selects the FRD tube with a small forward voltage drop, so that the adaptive PFC freewheeling circuit 1141" has a low temperature at low temperatures. The forward pressure drop is well balanced, and the reverse recovery time and the forward pressure drop are better balanced.

The voltage source 2018" is designed to be 0.5V, the voltage source 2019" is designed to be 0.6V, and the voltage source 2021" is designed to be 0.7V;

When the NOT gate 2027" outputs a low level, the voltage of ITRIP is compared with the voltage of the voltage source 2018". When the ITRIP voltage is >0.5V, the voltage comparator 2010" outputs a high level and causes ICON to generate a low level to stop the module from operating. ;

When the NOT gate 2027" outputs a high level, ITRIP is compared with the voltages of 0.5V, 0.6V, and 0.7V. Because the voltage is increasing, the voltage of ITRIP reaches 0.5V, and it needs to continue to rise for a period of time to reach 0.7V. Therefore, even The voltage of ITRIP is >0.5V, and it will take a while for the voltage comparator 2010", the voltage comparator 2019" and the voltage comparator 2021" to output a high level to make the NAND gate 2025" output low level. Depending on the rising slope of ITRIP, NAND gate 2025 NAND gate 2026 takes 4 times the minimum size allowed by the process and can generate a delay of 60 to 100 ns, which increases ICON's response time to ITRIP.

It can be seen that, based on the technical solution of the third embodiment, when the temperature near the FRD tube is low, the ITRIP is compared with a lower voltage to ensure the sensitivity to the overcurrent protection of the intelligent power module. When the temperature is high, the ITRIP and the ITRIP are A higher voltage comparison, taking into account the stability of the intelligent power module operation; and, at lower temperatures, the PFC circuit uses a FRD tube with a lower forward voltage drop to achieve lower power consumption, at higher temperatures, The PFC uses the FRD tube with a shorter reverse recovery time to reduce the voltage noise of the circuit; thus, the intelligent power module of the present invention maintains the stability of the system under the premise that the normal protection mechanism continues to be effective, and improves the user satisfaction of the product. degree.

Embodiment 4:

As shown in FIG. 15, an intelligent power module according to a fourth embodiment of the present invention includes: a HVIC tube 1101"' and an adaptive circuit 1105"'.

The VCC end of the HVIC tube 1101"' serves as the low-voltage area power supply positive terminal VDD of the smart power module 1100"', and VDD is generally 15V;

Inside the HVIC tube 1101"':

The ITRIP terminal is connected to the first input of the adaptive circuit 1105"'; the PFCINP terminal is connected to the adaptive The second input end of the circuit 1105"'; the VCC end is connected to the positive end of the power supply of the adaptive circuit 1105"'; the GND end is connected to the negative end of the power supply of the adaptive circuit 1105"'; the output of the adaptive circuit 1105"' For ICON, it is used to control the validity of the HIN1~HIN3, LIN1~LIN3, PFCINP signals; the third input of the adaptive circuit 1105"' is connected to the PFCC terminal of the HVIC tube 1101"'.

The bootstrap circuit structure inside the HVIC tube 1101"' is as follows:

The VCC terminal is connected to the bootstrap diode 1102"', the bootstrap diode 1103"', and the anode of the bootstrap diode 1104"'; the cathode of the bootstrap diode 1102"' is connected to the VB1 of the HVIC transistor 1101"'; the bootstrap diode 1103" The cathode of ' is connected to VB2 of HVIC tube 1101''; the cathode of bootstrap diode 1104"' is connected to VB3 of HVIC tube 1101"'.

The HIN1 end of the HVIC tube 1101"' is the U-phase upper arm signal input terminal UHIN of the intelligent power module 1100"'; the HIN2 end of the HVIC tube 1101"' is the V-phase upper arm signal input end of the intelligent power module 1100"' VHIN; HIN3 end of HVIC tube 1101"' is W-phase upper arm signal input terminal WHIN of intelligent power module 1100"'; LIN1 end of HVIC tube 1101"' is U-phase lower arm signal of intelligent power module 1100"' Input terminal ULIN; LIN2 end of HVIC tube 1101"' is V-phase lower arm signal input end VLIN of intelligent power module 1100"'; LIN3 end of HVIC tube 1101"' is W-phase lower bridge of intelligent power module 1100"' The arm signal input terminal WLIN; the ITRIP end of the HVIC tube 1101"' is the MTRIP end of the intelligent power module 1100"'; the PFCINP end of the HVIC tube 1101"' serves as the PFC control input terminal PFCIN of the intelligent power module 1100"'; the HVIC tube 1101 "'The GND terminal acts as the smart power module 1100"'s low-voltage zone power supply negative terminal COM. Among them, the intelligent power module 1100"'s UHIN, VHIN, WHIN, ULIN, VLIN, WLIN six inputs and PFCIN end receive 0V or 5V input signals.

The VB1 end of the HVIC tube 1101"' is connected to one end of the capacitor 1131"', and serves as the U-phase high voltage area power supply positive terminal UVB of the intelligent power module 1100"'; the HO1 end of the HVIC tube 1101"' and the U-phase upper arm IGBT The gate of the tube 1121"' is connected; the VS1 end of the HVIC tube 1101"' and the emitter of the IGBT tube 1121"', the anode of the FRD tube 1111"', the collector of the U-phase lower arm IGBT tube 1124"', FRD The cathode of the tube 1114"', the other end of the capacitor 1131"' is connected, and serves as the U-phase high voltage region power supply negative terminal UVS of the intelligent power module 1100"'.

The VB2 end of the HVIC tube 1101"' is connected to one end of the capacitor 1132"', and serves as the V-phase high voltage region power supply positive terminal VVB of the intelligent power module 1100"'; the HO2 end of the HVIC tube 1101"' The gate of the V-phase upper arm IGBT tube 1123"' is connected; the VS2 end of the HVIC tube 1101"' and the emitter of the IGBT tube 1122"', the anode of the FRD tube 1112"', and the V-phase lower arm IGBT tube 1125" 'The collector, the cathode of the FRD tube 1115"', the other end of the capacitor 1132"' is connected, and serves as the V-phase high-voltage region power supply negative terminal VVS of the intelligent power module 1100"'.

The VB3 end of the HVIC tube 1101"' is connected to one end of the capacitor 1133"' as the W-phase high voltage area power supply positive terminal WVB of the intelligent power module 1100"'; the HO3 end of the HVIC tube 1101"' and the W-phase upper arm IGBT tube The gate of 1123"' is connected; the VS3 end of HVIC tube 1101"' and the emitter of IGBT tube 1123"', the anode of FRD tube 1113"', the collector of F-phase lower arm IGBT tube 1126"', FRD tube The cathode of the 1116"', the other end of the capacitor 1133"' is connected, and serves as the W-phase high-voltage region power supply negative terminal WVS of the intelligent power module 1100"'.

The LO1 end of the HVIC tube 1101"' is connected to the gate of the IGBT tube 1124"'; the LO2 end of the HVIC tube 1101"' is connected to the gate of the IGBT tube 1125"'; the LO3 end of the HVIC tube 1101"' and the IGBT tube 1126 The emitter of ''gate is connected; the emitter of IGBT tube 1124'' is connected to the anode of FRD tube 1114"' and acts as the U-phase low voltage reference terminal UN of intelligent power module 1100"'; the emitter of IGBT tube 1125"' Connected to the anode of the FRD tube 1115"' and as the V-phase low voltage reference terminal VN of the intelligent power module 1100"'; the emitter of the IGBT tube 1126"' is connected to the anode of the FRD tube 1116"' and serves as an intelligent power module 1100"' W-phase low voltage reference terminal WN.

VDD is the positive terminal of the HVIC tube 1101"' power supply, GND is the negative terminal of the power supply of the HVIC tube 1101"'; the VDD-GND voltage is generally 15V; VB1 and VS1 are the positive and negative terminals of the U-phase high voltage region, respectively, HO1 It is the output end of the U-phase high-voltage zone; VB2 and VS2 are the positive and negative poles of the V-phase high-voltage zone, and HO2 is the output of the V-phase high-voltage zone; VB3 and VS3 are the positive and negative poles of the U-phase high-voltage zone respectively. HO3 is the output end of the W phase high voltage region; LO1, LO2, and LO3 are the output ends of the U phase, V phase, and W phase low voltage regions, respectively.

The PFCO end of the HVIC tube 1101"' is connected to the gate of the IGBT tube 1127"'; the emitter of the IGBT tube 1127"' is connected to the anode of the FRD tube 1117"' and serves as a PFC low voltage reference for the intelligent power module 1100"' The collector of the IGBT tube 1127"' is connected to the first input and output of the cathode of the FRD tube 1117"', the adaptive PFC freewheeling circuit 1141"', and serves as the PFC end of the intelligent power module 1100"'. The PFCC terminal is connected to the output of the adaptive PFC freewheeling circuit 1141"'.

The second input and output of the adaptive PFC freewheeling circuit 1141"', the set of IGBT tubes 1121"' Electrode, cathode of FRD tube 1111"', collector of IGBT tube 1122"', cathode of FRD tube 1112"', collector of IGBT tube 1123"', cathode of FRD tube 1113"', and as intelligent power module The high voltage input terminal P of 1100"', P is usually connected to 300V.

The role of the HVIC tube 1101"' is:

When ICON is low, HO1, HO2, HO3, LO1, LO2, LO3, and PFCO are all set low.

The role of the adaptive PFC freewheeling circuit 1141"' is:

When the temperature is lower than a certain temperature value T1, PFCC is low;

When the temperature is higher than a certain temperature value T1, PFCC is at a high level.

The role of the adaptive circuit 1105"' is:

When PFCC is low, if the real-time value of ITRIP is greater than a certain voltage value V1, then ICON outputs a low level; otherwise, ICON outputs a high level, and controls the phase of PFCO to be synchronized with PFCINP;

When PFCC is high, if the real-time value of ITRIP is greater than a certain voltage value V2, then ICON outputs a low level; otherwise, ICON outputs a high level, and regardless of whether PFCINP is high or low, control PFCO is set to Low level; where V2>V1.

In the fourth embodiment, specifically, the specific circuit structure of the adaptive circuit 1105"' is as shown in FIG. 16, specifically:

The first input terminal of the ITRIP (ie, the adaptive circuit 1105"' is connected to the positive input terminal of the voltage comparator 2010"', and the positive input terminal of the voltage comparator 2023"';

The negative input terminal of the voltage comparator 2010"' is connected to the positive terminal of the voltage source 2018"'; the negative terminal of the voltage source 2018"' is connected to the GND; the negative input terminal of the voltage comparator 2023"' is connected to the positive terminal of the voltage source 2019"' The negative terminal of the voltage source 2019"' is connected to GND; the output terminal of the voltage comparator 2010"' is connected to one of the input terminals of the NAND gate 2025"' and the 0 selection terminal of the analog switch 2022"';

The output of the voltage comparator 2023"' is connected to one of the inputs of the NAND gate 2025"'; the output of the NAND gate 2025"' is connected to the input of the NOT gate 2026"'; the output of the NOT gate 2026"' a select terminal of the analog switch 2022"'; a fixed terminal of the analog switch 2022"' is connected to an input of the NOT gate 2020"'; an output of the NOT gate 2020"' is an ICON;

The control terminal of the analog switch 2022"' is the third input of the adaptive circuit 1105"' and is connected to one of the inputs of the NOR gate 2001"'; the PFCINP terminates the other input of the NOR gate 2001"'; The output terminal of the NOR gate 2001"' is connected to the input end of the NOT gate 2002"'; the output end of the NOT gate 2002"' is connected to the signal input end of the PFC drive circuit, and the signal output end of the PFC drive circuit is connected to the PFCO terminal.

In the fourth embodiment, specifically, the specific circuit structure of the PFC freewheeling circuit 1141"' is as shown in FIG. 17, specifically:

One end of the resistor 2016"' is connected to VCC; the other end of the resistor 2016"' is connected to one end of the resistor 2013"' and the cathode of the Zener diode 2011"'; the other end of the resistor 2013"' is connected to one end of the PTC resistor 2012"' and the voltage The positive input terminal of the comparator 2015"'; the other end of the Zener diode 2011"' is connected to GND; the other end of the PTC resistor 2012"' is connected to GND;

The negative input terminal of the voltage comparator 2015"' is connected to the positive terminal of the voltage source 2014"'; the negative terminal of the voltage source 2014"' is connected to the GND; the output terminal of the voltage comparator 2015"' is connected to the input terminal of the NOT gate 2017"'; The output of the NOT gate 2017"' is connected to the input of the NOT gate 2027"'; the output of the NOT gate 2027"' serves as the output of the adaptive PFC freewheeling circuit 1141"';

The cathode of the FRD tube 2002"' is the first input and output of the adaptive PFC freewheeling circuit 1141"'; the anode of the FRD tube 2002"' is the second input and output of the adaptive PFC freewheeling circuit 1141"'.

The working principle and key parameters of the fourth embodiment are described below:

The Zener diode 2011"' clamp voltage is designed to be 6.4V, and the resistor 2016"' is designed to be 20kΩ. At the B"' point shown in Figure 17, a stable 6.4V voltage is generated that does not affect the VCC voltage fluctuation; PTC resistor 2012"' is placed near the FRD tube 2002"', and the PTC resistor 2012"' can be designed to be 10kΩ at 25°C and 20kΩ at 100°C; the resistor 2013”' is designed to be 44kΩ, and the voltage source 2014”' is designed to be 2V. Below 100 °C, the voltage comparator 2015"' output low level, after the non-gate 2017" 'and NAND gate 2027"' output low level, above 100 °C, the voltage comparator 2015" 'output high level, After the non-door 2017" 'Yuanfei 2027"' output high power level. The size of the MOS tube of the non-gate 2017" can be considered to be 1.5 times the minimum size allowed by the process, and the size of the MOS tube of the non-gate 2027"' can be considered to be twice the size of the MOS tube designed as the non-gate 2017".

Therefore, when the temperature of the PTC resistor 2012"' is greater than 100 °C, the NOT gate 2027"' outputs a high level; when the temperature of the PTC resistor 2012"' is less than 100 °C, the NOT gate 2027"' outputs a low level;

The voltage source 2018"' is designed to be 0.5V, the voltage source 2019"' is designed to be 0.6V; when the NOT gate 2027"' is output low, the voltage of the ITRIP is compared with the voltage of the voltage source 2018"', when the ITRIP voltage is >0.5V At the time, the voltage comparator 2010"' outputs a high level and causes ICON to generate a low level to stop the module from operating; and, at this time, the output level of the NOR gate 2001"' is completely determined by the PFCINP and inverted from the PFCINP. After passing through the NOT gate 2002"', the output is in phase with the PFCINP;

When the NOT gate 2027"' outputs a high level, ITRIP is compared with the voltage of 0.5V and 0.6V. Because the voltage is increasing, the voltage of ITRIP reaches 0.5V, and it needs to continue to rise for a period of time to reach 0.6V. Therefore, even if ITRIP The voltage is >0.5V, and it will take a while for the voltage comparator 2010"' and the voltage comparator 2023"' to output a high level to make the NAND gate 2025"' output low level. This duration depends on the rising slope of ITRIP. And set. The NAND gate 2025"' NAND gate 2026"' takes 4 times the minimum size allowed by the process, and can generate a delay of 60-100 ns, thereby increasing the response time of ICON to ITRIP; and, at this time, the NOR gate 2001 The output level of '' is fixed at a high level, after passing the NOT gate 2002'', the constant output is low regardless of the level of PFCINP.

It can be seen that, based on the technical solution of Embodiment 4, when the temperature near the FRD is low, the ITRIP is compared with a lower voltage to ensure the sensitivity to the overcurrent protection of the intelligent power module. When the temperature near the FRD is high, Compared with a higher voltage, ITRIP takes into account the stability of the intelligent power module. Moreover, when the temperature near the FRD is low, the PFC circuit works normally to improve the system efficiency. When the temperature near the FRD is high, the PFC circuit stops working and the system is improved. Stability; thus, the intelligent power module of the present invention maintains the stability of the system while improving the user satisfaction of the product under the premise that the normal protection mechanism continues to be effective.

The technical solution of the present invention is described in detail above with reference to the accompanying drawings. The present invention provides a new intelligent power module, which can effectively reduce the probability of the intelligent power module being falsely triggered at high temperature and improve the reliability of the intelligent power module.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and changes of the present invention are possible in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

An intelligent power module, comprising:

Three-phase upper arm signal input end, three-phase lower arm signal input end, three-phase low voltage reference end, current detecting end and PFC end;

a HVIC tube, wherein the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and a first port connected to the current detecting end;

a sampling resistor, the three-phase low voltage reference terminal and the current detecting terminal are both connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected to the low voltage region of the smart power module end;

An adaptive circuit, an input end of the adaptive circuit is connected to the first port, and a first output end of the adaptive circuit is used as an enable end of the HVIC tube;

a PFC freewheeling circuit, an input end of the PFC freewheeling circuit is connected to a second output end of the adaptive circuit, a first input and output end of the PFC freewheeling circuit is connected to the PFC end, and the PFC continues a second input and output end of the flow circuit is connected to the high voltage input end of the smart power module, and the PFC freewheeling circuit realizes a forward voltage drop according to a level signal input at an input end of the PFC freewheel circuit a function of a freewheeling diode of a predetermined voltage drop value or a function of a freewheeling diode that achieves a reverse recovery time less than a predetermined length of time;

Wherein the adaptive circuit outputs a signal of a first level through the second output terminal when the temperature of the smart power module is lower than a predetermined temperature value, and according to an input signal of an input end of the adaptive circuit And a magnitude relationship between the value and the first set value outputting an enable signal of a corresponding level through the first output terminal; the adaptive circuit is when the temperature of the smart power module is higher than the predetermined temperature value, Outputting a signal of a second level through the second output end, and outputting corresponding power through the first output end according to a magnitude relationship between a value of the input signal of the input end of the adaptive circuit and a second set value a flat enable signal, the second set value being greater than the first set value.
The intelligent power module according to claim 1, wherein:

The adaptive circuit is when the temperature of the smart power module is lower than a predetermined temperature value If the value of the input signal at the input end of the adaptive circuit is greater than or equal to the first set value, the first level output enable signal is output through the first output terminal to prohibit the HVIC tube from operating; Otherwise, the second level of the enable signal is output through the first output terminal to allow the HVIC tube to operate;

The adaptive circuit, when the temperature of the smart power module is higher than the predetermined temperature value, if the value of the input signal of the input end of the adaptive circuit is greater than or equal to the second set value, The first output terminal outputs the first level enable signal; otherwise, the second level enable signal is output through the first output terminal.
The intelligent power module according to claim 1, wherein the adaptive circuit comprises:

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the adaptive circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode is connected To the negative pole of the power supply of the adaptive circuit, the positive and negative poles of the power supply of the adaptive circuit are respectively connected to the positive and negative terminals of the low-voltage power supply of the intelligent power module;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the first voltage comparator;

a thermistor, a first end of the thermistor is connected to a second end of the second resistor, and a second end of the thermistor is connected to an anode of the Zener diode;

a first voltage source, a cathode of the first voltage source is coupled to an anode of the Zener diode, a cathode of the first voltage source is coupled to a negative input terminal of the first voltage comparator, the first voltage An output of the comparator is coupled to the input of the first NOT gate, an output of the first NOT gate is coupled to an input of the second NOT gate, and an output of the second NOT gate is coupled to the first analog switch a control end and as a second output of the adaptive circuit;

a second voltage comparator, a positive input terminal of the second voltage comparator serving as an input terminal of the adaptive circuit, and a negative input terminal of the second voltage comparator being coupled to a positive terminal of the second voltage source, the a cathode of the two voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to the first selection end of the first analog switch and the first input of the first NAND gate End

a third voltage comparator, a positive input terminal of the third voltage comparator is coupled to a positive input terminal of the second voltage comparator, and a negative input terminal of the third voltage comparator is coupled to a positive terminal of a third voltage source a negative electrode of the third voltage source is connected to a negative power supply of the adaptive circuit, and an output of the third voltage comparator is connected to a second input of the first NAND gate, the first The output end of the NAND gate is connected to the input end of the third non-gate, and the output end of the third non-gate is connected to the second selection end of the first analog switch, the fixed end of the first analog switch is connected to An input of the fourth NOT gate, the output of the fourth NOT gate serving as a first output of the adaptive circuit.
The intelligent power module according to claim 1, wherein said PFC freewheeling circuit comprises two freewheeling diodes;

The PFC freewheeling circuit selects a freewheeling diode access circuit having a low forward voltage drop in the two freewheeling diodes when the first level signal is input at an input end of the PFC freewheeling circuit;

The PFC freewheeling circuit selects a freewheeling diode access circuit having a short reverse recovery time among the two freewheeling diodes when the signal of the second level is input at an input end of the PFC freewheeling circuit.
The intelligent power module according to claim 4, wherein the PFC freewheeling circuit comprises:

a second analog switch, the fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit, and the first selected end of the second analog switch is connected to a cathode of the first freewheeling diode The second selection end of the second analog switch is connected to the cathode of the second freewheeling diode;

a third analog switch, the fixed end of the third analog switch serves as a second input and output end of the PFC freewheeling circuit, and the first selected end of the third analog switch is connected to an anode of the first freewheeling diode a second selection end of the third analog switch is coupled to an anode of the second freewheeling diode;

The control end of the third analog switch is connected to the control end of the second analog switch and serves as an input end of the PFC freewheeling circuit.
An intelligent power module, comprising:

Three-phase upper arm signal input end, three-phase lower arm signal input end, three-phase low voltage reference end, current detecting end, PFC control input end and PFC end;

a HVIC tube, wherein the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and a first port corresponding to the current detecting end and corresponding a second port of the PFC control input, the first port is connected to the current detecting end through a connecting line, and the second port is connected to the PFC control input end through a connecting line;

a sampling resistor, the three-phase low voltage reference terminal and the current detecting terminal are both connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected to the low voltage region of the smart power module end;

An adaptive circuit, wherein the first input end and the second input end of the adaptive circuit are respectively connected to the first port and the second port, and the first output end of the adaptive circuit serves as the HVIC tube Enable end

a PFC freewheeling circuit, the first input end, the second input end, the first input output end, and the second input/output end of the PFC freewheeling circuit are respectively connected to the second output end of the adaptive circuit, a third output end of the adaptive circuit, the PFC end, and a high voltage input end of the smart power module, wherein the PFC freewheeling circuit is implemented according to a level signal input by two input ends of the PFC freewheeling circuit a function of a freewheeling diode whose forward voltage is lowered by a predetermined voltage drop value or a function of a freewheeling diode whose reverse recovery current is controlled;

The adaptive circuit passes the temperature of the smart power module, the size of the input signal of the first input end of the adaptive circuit, and whether the input signal of the second input end of the adaptive circuit is on a rising edge. The first output terminal, the second output terminal, and the third output terminal output signals of respective levels.
The intelligent power module according to claim 6, wherein:

The adaptive circuit outputs a signal of a first level through the second output terminal when a temperature of the smart power module is lower than a predetermined temperature value, and a temperature of the smart power module is higher than the predetermined temperature And outputting, by the second output end, a signal of a second level;

The adaptive circuit outputs the signal of the second level through the third output terminal within a predetermined period of time after the rising edge of the input signal of the second input end of the adaptive circuit; Outputting, by the third output, the signal of the first level;

The adaptive circuit, when the temperature of the smart power module is lower than a predetermined temperature value, if the value of the input signal of the first input end of the adaptive circuit is greater than or equal to the first set value, Outputting the first level enable signal to disable operation of the HVIC tube; otherwise, outputting the second level enable signal through the first output terminal to allow the HVIC tube to operate ;

The adaptive circuit, when the temperature of the smart power module is higher than the predetermined temperature value, if the value of the input signal of the first input end of the adaptive circuit is greater than or equal to the second set value, The first output terminal outputs the first level enable signal; otherwise, the second output enable signal is output through the first output terminal;

The second set value is greater than the first set value.
The intelligent power module according to claim 6, wherein the adaptive circuit comprises:

a first non-gate and a second non-gate connected in series, the input end of the first non-gate is used as a second input end of the adaptive circuit, and the output end of the second non-gate is connected to the first NAND gate First input;

a third non-gate, a fourth non-gate, and a fifth non-gate connected in series, the input end of the third non-gate is connected to the input end of the first non-gate, and the output end of the fifth non-gate is connected to a second input end of the first NAND gate, an output end of the first NAND gate is connected to an input end of a sixth NOT gate, and an output end of the sixth NOT gate is used as the first Three output terminals;

a first capacitor connected between the input end of the fourth NOT gate and the negative pole of the power supply of the adaptive circuit;

a second capacitor connected between the input end of the fifth inverting gate and the negative pole of the power supply of the adaptive circuit;

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the adaptive circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode is connected To the negative pole of the power supply of the adaptive circuit, the positive and negative poles of the power supply of the adaptive circuit are respectively connected to the positive and negative terminals of the low-voltage power supply of the intelligent power module;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the first voltage comparator;

a thermistor, a first end of the thermistor is connected to a second end of the second resistor, and a second end of the thermistor is connected to an anode of the Zener diode;

a first voltage source, a cathode of the first voltage source is coupled to an anode of the Zener diode, a cathode of the first voltage source is coupled to a negative input terminal of the first voltage comparator, the first voltage The output of the comparator is connected to the input of the seventh non-gate, the output of the seventh non-gate is connected to the input of the eighth non-gate, and the output of the eighth non-gate is connected to the first analog switch a control end and as a second output of the adaptive circuit;

a second voltage comparator, a positive input terminal of the second voltage comparator serving as a first input terminal of the adaptive circuit, and a negative input terminal of the second voltage comparator being coupled to a positive terminal of the second voltage source a cathode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a first selection end of the first analog switch and a second NAND gate An input;

a third voltage comparator, a positive input terminal of the third voltage comparator is coupled to a positive input terminal of the second voltage comparator, and a negative input terminal of the third voltage comparator is coupled to a positive terminal of a third voltage source a negative electrode of the third voltage source is connected to a negative power supply of the adaptive circuit, and an output of the third voltage comparator is connected to a second input of the second NAND gate, the second The output of the NAND gate is connected to the input end of the ninth non-gate, and the output end of the ninth non-gate is connected to the second selection end of the first analog switch, and the fixed end of the first analog switch is connected to An input of the tenth non-gate, the output of the tenth non-gate is used as a first output of the adaptive circuit.
The intelligent power module according to claim 6, wherein:

The PFC freewheeling circuit realizes a function of a freewheeling diode whose forward conduction voltage is lower than a predetermined voltage drop value when a signal of a first level is input to at least one of the two input ends of the PFC freewheeling circuit; as well as

The PFC freewheeling circuit implements a reverse recovery current controlled freewheeling diode function when a second level signal is input to both inputs of the PFC freewheeling circuit.
The intelligent power module according to claim 9, wherein said PFC The freewheeling circuit includes:

a third NAND gate, two input ends of the third NAND gate respectively serving as two input ends of the PFC freewheeling circuit, and an output end of the third NAND gate is connected to the eleventh non-gate An output end of the eleventh non-gate is connected to a control end of the second analog switch, and a fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit;

a third resistor, a first end of the third resistor is connected to the first selection end of the second analog switch, and a second end of the third resistor is connected to the second selection end of the second analog switch, And as the second input and output of the PFC freewheeling circuit.
An intelligent power module, comprising:

Three-phase upper arm signal input end, three-phase lower arm signal input end, three-phase low voltage reference end, current detecting end and PFC end;

a HVIC tube, wherein the HVIC tube is provided with a terminal respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and a first port corresponding to the current detecting end, The first port is connected to the current detecting end through a connecting line;

a sampling resistor, the three-phase low voltage reference terminal and the current detecting terminal are both connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected to the low voltage region of the smart power module end;

An adaptive circuit, a first input end of the adaptive circuit is connected to the first port, and an output end of the adaptive circuit is an enable end of the HVIC tube;

a PFC freewheeling circuit, wherein the first input and output ends, the second input and output ends, and the output end of the PFC freewheeling circuit are respectively connected to the PFC terminal, the high voltage input end of the intelligent power module, and the adaptive a second input end of the circuit, the PFC freewheeling circuit realizes a function of a freewheeling diode whose forward conduction voltage is lowered by a predetermined voltage drop value according to a temperature of the intelligent power module or a reverse recovery time is less than a predetermined duration a function of a freewheeling diode, and when the temperature of the smart power module is lower than a predetermined temperature value, outputting a signal of a first level through an output end of the PFC freewheeling circuit, wherein a temperature of the smart power module is higher than And outputting, by the output end of the PFC freewheeling circuit, a signal of a second level;

The adaptive circuit outputs a corresponding level through an output end of the adaptive circuit according to a size of an input signal of the first input end and a level signal input by the second input end. Enable signal.
The intelligent power module according to claim 11, wherein:

The adaptive circuit, when the signal of the first level is input by the second input end, if the value of the input signal of the first input end is greater than or equal to a first set value, pass the adaptive circuit Outputting the first level enable signal to disable operation of the HVIC tube; otherwise, outputting the second level enable signal through an output of the adaptive circuit to allow the HVIC tube work;

The adaptive circuit, when the second input terminal inputs the signal of the second level, if the value of the input signal of the first input terminal is greater than or equal to a second set value, Outputting the first level of the enable signal; otherwise, outputting the second level enable signal through the output of the adaptive circuit;

The second set value is greater than the first set value.
The intelligent power module according to claim 11, wherein the adaptive circuit comprises:

a first voltage comparator, a positive input terminal of the first voltage comparator serves as a first input end of the adaptive circuit, and a negative input terminal of the first voltage comparator is coupled to a positive terminal of the first voltage source, a cathode of the first voltage source is connected to a negative power supply of the adaptive circuit, and an output of the first voltage comparator is connected to a first selection end of the first analog switch and a first input of the first NAND gate The positive and negative terminals of the power supply of the adaptive circuit are respectively connected to the positive end and the negative end of the low-voltage power supply of the intelligent power module;

a second voltage comparator, a positive input terminal of the second voltage comparator is coupled to a positive input terminal of the first voltage comparator, and a negative input terminal of the second voltage comparator is coupled to a positive terminal of a second voltage source a negative electrode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a second input of the first NAND gate, the first An output end of the NAND gate is connected to the input end of the first NOT gate, and an output end of the first NOT gate is connected to a second selection end of the first analog switch, and the control end of the first analog switch serves as a The second input end of the adaptive circuit, the fixed end of the first analog switch is connected to the input end of the second NOT gate, and the output end of the second NOT gate is used as an output end of the adaptive circuit.
The intelligent power module according to claim 11, wherein:

The PFC freewheeling circuit realizes a function of a freewheeling diode whose forward conduction voltage is lowered by a predetermined voltage drop value when the temperature of the intelligent power module is lower than a predetermined temperature value;

The PFC freewheeling circuit realizes a function of a freewheeling diode whose reverse recovery time is lower than a predetermined duration when the temperature of the smart power module is higher than the predetermined temperature value.
The intelligent power module according to claim 14, wherein the PFC freewheeling circuit comprises:

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the PFC freewheeling circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode Connected to the negative pole of the power supply of the PFC freewheeling circuit, the positive and negative poles of the power supply of the PFC freewheeling circuit are respectively connected to the positive and negative terminals of the low voltage power supply of the intelligent power module;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the third voltage comparator;

a thermistor, a first end of the thermistor is connected to a second end of the second resistor, and a second end of the thermistor is connected to an anode of the Zener diode;

a third voltage source, a cathode of the third voltage source is connected to an anode of the Zener diode, a cathode of the third voltage source is connected to a negative input terminal of the third voltage comparator, the third voltage The output of the comparator is connected to the input of the third NOT gate, the output of the third NOT gate is connected to the input of the fourth NOT gate, and the output of the fourth NOT gate is used as the PFC freewheeling circuit Output

a second analog switch, the fixed end of the second analog switch serves as a first input and output end of the PFC freewheeling circuit, and the first selected end of the second analog switch is connected to a cathode of the first freewheeling diode The second selection end of the second analog switch is connected to the cathode of the second freewheeling diode, and the control end of the second analog switch is connected to the output end of the fourth non-gate;

a third analog switch, the fixed end of the third analog switch serves as a second input and output end of the PFC freewheeling circuit, and the first selected end of the third analog switch is connected to an anode of the first freewheeling diode a second selection end of the third analog switch is connected to an anode of the second freewheeling diode, and a control end of the third analog switch is connected to an output end of the fourth NOT gate;

Wherein the forward conduction voltage of the first freewheeling diode is reduced to a predetermined voltage drop value, The reverse recovery time of the two freewheeling diodes is lower than a predetermined duration, and the thermistor is disposed at a position where the first freewheeling diode and the second freewheeling diode are located.
An intelligent power module, comprising:

Three-phase upper arm signal input end, three-phase lower arm signal input end, three-phase low voltage reference end, current detecting end, PFC control input end and PFC end;

a sampling resistor, the three-phase low voltage reference terminal and the current detecting terminal are both connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected to the low voltage region of the smart power module end;

a HVIC tube, wherein the HVIC tube is provided with terminals respectively connected to the three-phase upper arm signal input end and the three-phase lower arm signal input end, and respectively connected to the current detecting end and the a first port and a second port of the PFC control input, wherein the HVIC tube is provided with a PFC driving circuit;

An adaptive circuit, wherein the first input end and the second input end of the adaptive circuit are respectively connected to the first port and the second port, and the first output end of the adaptive circuit serves as the HVIC tube The second output end of the adaptive circuit is connected to the signal input end of the PFC driving circuit;

a PFC freewheeling circuit, wherein the first input and output ends, the second input and output ends, and the output end of the PFC freewheeling circuit are respectively connected to the PFC terminal, the high voltage input end of the intelligent power module, and the adaptive a third input end of the circuit, the PFC freewheeling circuit outputs a first level signal through an output of the PFC freewheeling circuit when the temperature of the smart power module is lower than a predetermined temperature value, in the smart When the temperature of the power module is higher than the predetermined temperature value, outputting a signal of a second level through an output end of the PFC freewheeling circuit;

The adaptive circuit outputs an enable signal of a corresponding level through the first output end of the adaptive circuit according to the level signal input by the third input terminal and the magnitude of the input signal of the first input terminal. And controlling, by the second output end of the adaptive circuit, a control signal for controlling the PFC driving circuit.
The intelligent power module of claim 16 wherein:

The adaptive circuit inputs the signal of the first level when the third input terminal inputs, if the value of the input signal of the first input end is greater than or equal to the first set value, a first output of the circuit outputs an enable signal of the first level to disable operation of the HVIC tube; otherwise, an enable signal of the second level is output through a first output of the adaptive circuit And allowing the HVIC tube to operate, and outputting, by the second output end of the adaptive circuit, a control signal that controls an output signal of the PFC driving circuit to be synchronized with an input signal;

And the adaptive circuit, when the signal of the second level is input by the third input end, if the value of the input signal of the first input end is greater than or equal to a second set value, pass the adaptive circuit The first output terminal outputs the first level enable signal; otherwise, the first output terminal of the adaptive circuit outputs the second level enable signal, and passes through the adaptive circuit The second output terminal outputs a control signal for controlling the PFC driving circuit to stop working;

The second set value is greater than the first set value.
The intelligent power module according to claim 16, wherein the adaptive circuit comprises:

a first voltage comparator, a positive input terminal of the first voltage comparator serves as a first input end of the adaptive circuit, and a negative input terminal of the first voltage comparator is coupled to a positive terminal of the first voltage source, a cathode of the first voltage source is connected to a negative power supply of the adaptive circuit, and an output of the first voltage comparator is connected to a first selection end of the first analog switch and a first input of the first NAND gate The positive and negative terminals of the power supply of the adaptive circuit are respectively connected to the positive end and the negative end of the low-voltage power supply of the intelligent power module;

a second voltage comparator, a positive input terminal of the second voltage comparator is coupled to a positive input terminal of the first voltage comparator, and a negative input terminal of the second voltage comparator is coupled to a positive terminal of a second voltage source a negative electrode of the second voltage source is connected to a negative power supply of the adaptive circuit, and an output of the second voltage comparator is connected to a second input of the first NAND gate, the first An output end of the NAND gate is connected to the input end of the first NOT gate, and an output end of the first NOT gate is connected to a second selection end of the first analog switch, and the control end of the first analog switch serves as a a third input end of the adaptive circuit, the fixed end of the first analog switch is connected to the input end of the second NOT gate, and the output end of the second NOT gate is used as the first output end of the adaptive circuit;

a first input end of the NOR gate as a second input end of the adaptive circuit, and a second input end of the NOR gate is connected to a third input end of the adaptive circuit, The output of the NOR gate is connected to the input end of the third NOT gate, and the output end of the third NOT gate serves as The second output of the adaptive circuit.
The intelligent power module according to claim 16, wherein the PFC freewheeling circuit comprises:

a first resistor, a first end of the first resistor is connected to a positive pole of a power supply of the PFC freewheeling circuit, a second end of the first resistor is connected to a cathode of a Zener diode, and an anode of the Zener diode Connected to the negative pole of the power supply of the PFC freewheeling circuit, the positive and negative poles of the power supply of the PFC freewheeling circuit are respectively connected to the positive and negative terminals of the low voltage power supply of the intelligent power module;

a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is connected to a positive input end of the third voltage comparator;

a thermistor, a first end of the thermistor is connected to a second end of the second resistor, and a second end of the thermistor is connected to an anode of the Zener diode;

a third voltage source, a cathode of the third voltage source is connected to an anode of the Zener diode, a cathode of the third voltage source is connected to a negative input terminal of the third voltage comparator, the third voltage The output of the comparator is connected to the input of the fourth NOT gate, the output of the fourth NOT gate is connected to the input of the fifth NOT gate, and the output of the fifth NOT gate is used as the PFC freewheeling circuit Output

a freewheeling diode having an anode as a first input and output of the PFC freewheeling circuit, and a cathode of the freewheeling diode as a second input and output of the PFC freewheeling circuit;

Wherein the thermistor is disposed at a position where the freewheeling diode is located.
The smart power module according to any one of claims 1 to 19, wherein the HVIC tube is further provided with a signal output end of the PFC driving circuit, and the smart power module further comprises:

a first power switch tube and a first diode, an anode of the first diode is connected to an emitter of the first power switch tube, and a cathode of the first diode is connected to the first power a collector of the switch tube, a base of the first power switch tube is connected to a signal output end of the PFC drive circuit, and an emitter of the first power switch tube serves as a PFC low voltage reference end of the smart power module The collector of the first power switch tube serves as the PFC terminal.
The intelligent power module according to any one of claims 1 to 19, further comprising: a bootstrap circuit, wherein the bootstrap circuit comprises:

a first bootstrap diode, an anode of the first bootstrap diode is connected to a low voltage power supply positive terminal of the smart power module, and a cathode of the first bootstrap diode is connected to a U phase high voltage of the smart power module District power supply positive terminal;

a second bootstrap diode, an anode of the second bootstrap diode is connected to a low voltage power supply positive terminal of the smart power module, and a cathode of the second bootstrap diode is connected to a V phase high voltage of the smart power module District power supply positive terminal;

a third bootstrap diode, an anode of the third bootstrap diode is connected to a low voltage power supply positive terminal of the smart power module, and a cathode of the third bootstrap diode is connected to a W phase high voltage of the smart power module The power supply is positive at the front end.
The intelligent power module according to any one of claims 1 to 19, further comprising:

a three-phase upper arm circuit, wherein an input end of the bridge arm circuit of each phase of the three-phase upper arm circuit is connected to a signal output end of a corresponding phase in a three-phase high voltage region of the HVIC tube;

A three-phase lower arm circuit, an input end of each of the three-phase lower arm circuits is connected to a signal output end of a corresponding phase in a three-phase low-voltage region of the HVIC tube.
The intelligent power module according to claim 22, wherein said each phase upper arm circuit comprises:

a second power switch transistor and a second diode, an anode of the second diode is coupled to an emitter of the second power switch transistor, and a cathode of the second diode is coupled to the second power a collector of the switch, a collector of the second power switch connected to a high voltage input of the smart power module, and a base of the second power switch as a bridge circuit of each phase The input end, the emitter of the second power switch tube is connected to the negative end of the high voltage area power supply of the corresponding phase of the smart power module.
The intelligent power module according to claim 23, wherein said each phase lower arm circuit comprises:

a third power switch transistor and a third diode, an anode of the third diode is connected to an emitter of the third power switch tube, and a cathode of the third diode is connected to the third power Switch a collector of the tube, a collector of the third power switch is connected to an anode of the second diode in the corresponding upper arm circuit, and a base of the third power switch is used as each The input end of the phase bridge circuit, the emitter of the third power switch tube serves as a low voltage reference end of the corresponding phase of the smart power module.
An air conditioner, comprising: the intelligent power module according to any one of claims 1 to 24.