CN205453540U - Intelligence power module and air conditioner - Google Patents

Abstract

The utility model provides an intelligent power module and an air conditioner. The HVIC tube in the intelligent power module is provided with a first port corresponding to the current detection end; the input end of the adaptive circuit is connected to the first port, and the first output end serves as The enabling terminal of the HVIC tube; the input terminal, the first input and output terminals, and the second input and output terminals of the PFC freewheeling circuit are respectively connected to the second output terminal of the adaptive circuit, the PFC terminal and the high voltage input terminal of the IPM, and the PFC continues According to the level signal input at its input terminal, the current circuit realizes the function of the freewheeling diode whose forward voltage drop is lower than the predetermined voltage drop value or the reverse recovery time is lower than the predetermined time length; the temperature of the adaptive circuit at IPM is lower than the predetermined temperature value, output the signal of the first level through the second output terminal, and output the enable signal according to the input signal of the input terminal, and output the second level through the second output terminal when the temperature of the IPM is higher than the predetermined temperature value signal, and output the enable signal according to the input signal at its input.

Description

Smart Power Modules and Air Conditioners

technical field

The utility model relates to the technical field of intelligent power modules, in particular to an intelligent power module and an air conditioner.

Background technique

Intelligent Power Module (Intelligent Power Module, referred to as IPM) is a power driver that integrates power electronic discrete devices and integrated circuit technology. and other fault detection circuits. The logic input terminal of the intelligent power module receives the control signal of the main controller, and the output terminal drives the compressor or subsequent circuits to work, and at the same time sends the detected system status signal back to the main controller. Compared with traditional discrete solutions, intelligent power modules have the advantages of high integration, high reliability, self-test and protection circuits, etc., and are especially suitable for inverters and various inverter power supplies for driving motors. Ideal power electronic devices for traction, servo drives, and inverter appliances.

A schematic structural diagram of an existing intelligent power module circuit is shown in FIG. 1 , and the MTRIP port is used as a current detection terminal to protect the intelligent power module 100 according to the magnitude of the detected current. The PFCIN port serves as the PFC (PowerFactorCorrection, power factor correction) control input port of the intelligent power module.

During the working process 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 in the freewheeling state. The frequency is generally LIN1~LIN3, HIN1~ 2 to 4 times the switching frequency of HIN3, and has no direct connection with the switching frequency of LIN1 ~ LIN3, HIN1 ~ HIN3.

As shown in Figure 2, UN, VN, and WN are connected to one end of the milliohm resistor 138, the other end of the milliohm resistor 138 is connected to GND, and MTRIP is the current detection pin, connected to one end of the milliohm resistor 138, by detecting the milliohm resistor Voltage drop is used to calculate the current, as shown in FIG. 3 . When the current is too large, the smart power module 100 is stopped to avoid permanent damage to the smart power module 100 after overheating due to overcurrent.

-VP, COM, UN, VN, WN have electrical connections in actual use. Therefore, voltage noise during switching of IGBT tubes 121-127 and current noise during freewheeling of FRD tubes 111-FRD 116 and FRD tube 131 will be coupled with each other, affecting input pins in low-voltage regions.

Among the input pins, the thresholds of HIN1~HIN3, LIN1~LIN3, and PFCINP are generally around 2.3V, while the threshold voltage of ITRIP is generally below 0.5V. Therefore, ITRIP is the pin most susceptible to interference. When the ITRIP is triggered, the intelligent power module 100 will stop working, and because no overcurrent actually occurs at this time, the triggering of the ITRIP at this time is a false trigger. As shown in Figure 4, when PFCIN is at a high level and the IGBT tube 127 is turned on at the moment, due to the existence of the reverse recovery current of the FRD tube 131, the current waveform of I ₁₃₁ is superimposed, and the current has a large oscillating noise. - The electrical connection of VP, COM, UN, VN, and WN in the peripheral circuit, the oscillation noise will cause a certain voltage increase at the MTRIP end. Assume that the trigger condition of MTRIP is: voltage>Vth, and duration>Tth; in Figure 4, if Ta<Tth<Tb, then the voltage in the first three cycles is too high enough to cause false triggering of MTRIP, until the second Four cycles, MTRIP will generate a false trigger.

For the FRD tube of a specific process, the forward conduction voltage drop is inversely proportional to the reverse recovery time/reverse recovery current. The larger the forward conduction voltage drop, the smaller the reverse recovery time/reverse recovery current, and the forward conduction voltage drop The smaller the reverse recovery time/the greater the reverse recovery current. Generally, the switching frequency of PFC is fixed, and the frequency is between 20kHz and 40kHz. For such low-frequency applications, the impact of reverse recovery current on power consumption is less than that of forward conduction voltage drop on power consumption, usually Choose an FRD tube with a lower forward voltage drop to obtain lower conduction loss. But in fact, because the reverse recovery time and reverse recovery current of the FRD tube have positive temperature coefficients, the higher the temperature, the longer the reverse recovery time, so as the system continues to work, the temperature of the intelligent power module 100 continues to rise, MTRIP The chances of being triggered are increasing. As shown in Fig. 5, at 25°C, the voltage fluctuation caused by the reverse recovery effect of FRD is not enough to trigger MTRIP, while as the temperature increases, at 75°C, MTRIP is triggered and the system stops working. Although this false trigger will recover after a period of time without causing damage to the system, it will undoubtedly cause confusion for users. For example, in the application of inverter air conditioners, the higher the ambient temperature is, the more the user needs the continuous operation of the air conditioning system, but the high ambient temperature will increase the reverse recovery time of the FRD tube, and the probability of MTRIP being falsely triggered will increase. When MTRIP is triggered by mistake, the air conditioning system will stop working for 3 to 5 minutes due to the mistaken belief that overcurrent has occurred, so that users cannot obtain cold air during this period. This is one of the main reasons why the air conditioning system receives complaints from customers due to insufficient cooling capacity. .

Therefore, on the premise of ensuring that the smart power module can work normally at room temperature with low power consumption, how to effectively reduce the probability of false triggering of the smart power module at high temperature has become an urgent technical problem to be solved.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art or the related art.

Therefore, one purpose of this utility model is to propose a new intelligent power module, which can effectively reduce the false triggering of the intelligent power module at high temperature under the premise of ensuring that the intelligent power module can work normally at room temperature with low power consumption probability.

Another purpose of the utility model is to provide an air conditioner.

In order to achieve the above purpose, according to the embodiment of the first aspect of the utility model, an intelligent power module is proposed, including: three-phase upper bridge arm signal input end, three-phase lower bridge arm signal input end, three-phase low voltage reference Terminal, current detection terminal and PFC terminal; HVIC (HighVoltageIntegratedCircuit, high-voltage integrated circuit) tube, the HVIC tube is provided with respectively connected to the signal input terminal of the three-phase upper bridge arm and the signal input terminal of the three-phase lower bridge arm terminal, and a first port corresponding to the current detection terminal, the first port is connected to the current detection terminal through a connecting wire; a sampling resistor, the three-phase low voltage reference terminal and the current detection terminal are connected To the first end of the sampling resistor, the second end of the sampling resistor is connected to the negative end of the power supply in the low-voltage area of the intelligent power module; the adaptive circuit, the input end of the adaptive circuit is connected to the first A port, the first output end of the adaptive circuit is used as the enabling end of the HVIC tube; the PFC freewheeling circuit, the input end of the PFC freewheeling circuit is connected to the second output end of the adaptive circuit, The first input and output terminals of the PFC freewheeling circuit are connected to the PFC terminal, the second input and output terminals of the PFC freewheeling circuit are connected to the high voltage input terminal of the intelligent power module, and the PFC freewheeling circuit According to the level signal input by the input terminal of the PFC freewheeling circuit, the function of a freewheeling diode whose forward conduction voltage drop is lower than a predetermined voltage drop value or the function of a freewheeling diode whose reverse recovery duration is lower than a predetermined duration is realized;

Wherein, when the temperature of the intelligent power module is lower than a predetermined temperature value, the adaptive circuit outputs a signal of the first level through the second output terminal, and according to the input signal of the input terminal of the adaptive circuit The magnitude relationship between the value and the first set value outputs an enable signal of a corresponding level through the first output terminal; when the temperature of the intelligent power module is higher than the predetermined temperature value, the adaptive circuit, Output a signal of the second level through the second output terminal, and output a corresponding voltage through the first output terminal according to the magnitude relationship between the value of the input signal at the input terminal of the adaptive circuit and the second set value A flat enable signal, the second set value is greater than the first set value.

According to the intelligent power module of the embodiment of the present utility model, when the temperature of the intelligent power module is lower than the predetermined temperature value, according to the value of the input signal of the input terminal of the self-adaptive circuit (that is, the first port, that is, the current detection terminal) and the first set value to output an enabling signal of a corresponding level, so that when the temperature of the intelligent power module is low, the adaptive circuit can respond according to the signal value detected by the current detection terminal, that is When the signal value detected by the current detection terminal is large, the enabling signal for controlling the HVIC tube to stop working is output in time; when the signal value detected by the current detecting terminal is small, the enabling signal for controlling the operation of the HVIC tube is output to ensure that the smart power module It can work normally at normal temperature (that is, when it is lower than the predetermined temperature value), and it is protected against overcurrent.

When the temperature of the intelligent power module is higher than the predetermined temperature value, an enable signal of a corresponding level is output according to the magnitude relationship between the value of the input signal at the input terminal and the second set value, so that the temperature of the intelligent power module is higher When the second set value (compared to the first set value) is larger, it can be determined whether to output the enable signal for controlling the HVIC tube to stop working, thereby effectively reducing the time when the intelligent power module works at high temperature. Chance of being falsely triggered.

The PFC freewheeling circuit realizes the function of a freewheeling diode whose forward conduction voltage drop is lower than a predetermined voltage drop value or realizes a freewheeling diode whose reverse recovery duration is lower than a predetermined duration according to the level signal input by the input terminal of the PFC freewheeling circuit function, so 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 drop is lower than the predetermined voltage drop value can be realized, so as to reduce the power consumption of the intelligent power module when it works 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 time can be realized, so as to reduce the circuit noise generated by the intelligent power module when the temperature is high, so as to reduce the intelligent Probability of false triggering of power modules when working at high temperatures.

The intelligent power module according to the above-mentioned embodiments of the present invention may also have the following technical features:

According to an embodiment of the present utility model, when the temperature of the intelligent power module of the adaptive circuit is lower than a predetermined temperature value, if the value of the input signal at the input terminal of the adaptive circuit is greater than or equal to the first setting fixed value, output the enable signal of the first level through the first output terminal to prohibit the operation of the HVIC tube; otherwise, output the enable signal of the second level through the first output terminal signal to allow the HVIC tube to work;

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

According to an embodiment of the utility model, the adaptive circuit includes:

The 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 To the negative pole of the power supply of the adaptive circuit, the positive pole and the negative pole of the power supply of the adaptive circuit are respectively connected to the positive terminal and negative terminal of the low-voltage area power supply of the intelligent power module;

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

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

The first voltage source, the negative pole of the first voltage source is connected to the anode of the Zener diode, the positive pole of the first voltage source is connected to the negative input terminal of the first voltage comparator, and the first voltage The output terminal of the comparator is connected to the input terminal of the first NOT gate, the output terminal of the first NOT gate is connected to the input terminal of the second NOT gate, and the output terminal of the second NOT gate is connected to the first analog switch The control terminal is used as the second output terminal of the adaptive circuit;

A second voltage comparator, the positive input terminal of the second voltage comparator is used as the input terminal of the adaptive circuit, the negative input terminal of the second voltage comparator is connected to the positive pole of the second voltage source, and the first voltage comparator is connected to the positive pole of the second voltage source. The negative poles of the two voltage sources are connected to the negative poles of the power supply of the adaptive circuit, and the output terminal of the second voltage comparator is connected to the first selection terminal of the first analog switch and the first input of the first NAND gate. end;

A third voltage comparator, the positive input terminal of the third voltage comparator is connected to the positive input terminal of the second voltage comparator, and the negative input terminal of the third voltage comparator is connected to the positive pole of the third voltage source , the negative pole of the third voltage source is connected to the negative pole of the power supply of the adaptive circuit, the output terminal of the third voltage comparator is connected to the second input terminal of the first NAND gate, and the first The output terminal of the NAND gate is connected to the input terminal of the third NOT gate, the output terminal of the third NOT gate is connected to the second selection terminal of the first analog switch, and the fixed terminal of the first analog switch is connected to The input terminal of the fourth NOT gate, the output terminal of the fourth NOT gate serves as the first output terminal of the adaptive circuit.

According to an embodiment of the present invention, the PFC freewheeling circuit includes two freewheeling diodes; when the PFC freewheeling circuit inputs a signal of the first level at the input end of the PFC freewheeling circuit, Among the two freewheeling diodes, the freewheeling diode with a lower forward conduction voltage drop is connected to the circuit; when the PFC freewheeling circuit inputs the signal of the second level at the input end of the PFC freewheeling circuit, select The freewheeling diode with the shorter reverse recovery time among the two freewheeling diodes is connected to the circuit.

According to an embodiment of the present invention, the PFC freewheeling circuit includes: a second analog switch, the fixed terminal of the second analog switch is used as the first input and output terminal of the PFC freewheeling circuit, and the second analog The first selection end of the switch is connected to the cathode of the first freewheeling diode, and the second selection end of the second analog switch is connected to the cathode of the second freewheeling diode; the third analog switch, the fixed terminal as the second input and output terminal of the PFC freewheeling circuit, the first selection terminal of the third analog switch is connected to the anode of the first freewheel diode, and the second selection terminal of the third analog switch is connected to To the anode of the second freewheeling diode; wherein, the control terminal of the third analog switch is connected to the control terminal of the second analog switch, and serves as the input terminal of the PFC freewheeling circuit.

According to an embodiment of the present invention, the HVIC tube is also provided with a signal output terminal of the PFC drive circuit, and the intelligent power module further includes: a first power switch tube and a first diode, and the first two The anode of the pole tube is connected to the emitter of the first power switch tube, the cathode of the first diode is connected to the collector of the first power switch tube, and the base of the first power switch tube is connected to To the signal output terminal of the PFC drive circuit, the emitter of the first power switch tube serves as the PFC low voltage reference terminal of the intelligent power module, and the collector of the first power switch tube serves as the PFC terminal.

Wherein, the first power switch tube may be an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor).

According to an embodiment of the present utility model, it also includes: a bootstrap circuit, and the bootstrap circuit includes:

The first bootstrap diode, the anode of the first bootstrap diode is connected to the positive terminal of the power supply in the low-voltage area of the intelligent power module, and the cathode of the first bootstrap diode is connected to the U-phase high voltage of the intelligent power module area power supply positive end; second bootstrap diode, the anode of the second bootstrap diode is connected to the positive end of the low-voltage area power supply of the intelligent power module, and the cathode of the second bootstrap diode is connected to the intelligent The positive end of the power supply in the V-phase high-voltage area of the power module; the third bootstrap diode, the anode of the third bootstrap diode is connected to the positive end of the power supply in the low-voltage area of the intelligent power module, and the anode of the third bootstrap diode The cathode is connected to the positive terminal of the W-phase high-voltage area power supply of the intelligent power module.

According to an embodiment of the present invention, it also includes: a three-phase upper bridge arm circuit, the input end of each phase upper bridge arm circuit in the three-phase upper bridge arm circuit is connected to the three-phase high voltage area of the HVIC tube The signal output end of the corresponding phase in the middle; the three-phase lower bridge arm circuit, the input end of each phase lower bridge arm circuit in the three-phase lower bridge arm circuit is connected to the corresponding phase in the three-phase low voltage area of the HVIC tube signal output.

Among them, the three-phase upper bridge arm circuit includes: U-phase upper bridge arm circuit, V-phase upper bridge arm circuit, W-phase upper bridge arm circuit; the three-phase lower bridge arm circuit includes: U-phase lower bridge arm circuit, V-phase lower bridge arm circuit Arm circuit, W-phase lower bridge arm circuit.

According to an embodiment of the present invention, the upper bridge arm circuit of each phase includes: a second power switch tube and a second diode, and the anode of the second diode is connected to the second power switch tube the emitter of the second diode, the cathode of the second diode is connected to the collector of the second power switch tube, and the collector of the second power switch tube is connected to the high voltage input terminal of the intelligent power module, so The base of the second power switch tube is used as the input terminal of the upper bridge arm circuit of each phase, and the emitter of the second power switch tube is connected to the negative terminal of the high voltage power supply of the corresponding phase of the intelligent power module. Wherein, the second power switch tube may be an IGBT.

According to an embodiment of the present invention, the lower bridge arm circuit of each phase includes: a third power switch tube and a third diode, and the anode of the third diode is connected to the third power switch tube The emitter of the third diode, the cathode of the third diode is connected to the collector of the third power switch tube, and the collector of the third power switch tube is connected to the second diode in the corresponding upper bridge arm circuit. The anode of the diode, the base of the third power switch tube is used as the input terminal of the lower bridge arm circuit of each phase, and the emitter of the third power switch tube is used as the input terminal of the corresponding phase of the intelligent power module. Low Voltage Reference Terminal. Wherein, the third power switch tube may be an IGBT.

According to an embodiment of the present invention, the voltage of the high voltage input terminal of the intelligent power module is 300V.

According to an embodiment of the present utility model, a filter capacitor is connected between the positive terminal and the negative terminal of the power supply in the high-voltage area of each phase of the intelligent power module.

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

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

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

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

Fig. 3 shows a schematic diagram of a waveform in which a current signal triggers an intelligent power module to stop working;

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

FIG. 5 shows another waveform diagram of noise generated by an intelligent power module in the related art;

Fig. 6 shows a schematic structural diagram of an intelligent power module according to an embodiment of the present invention;

FIG. 7 shows a schematic diagram of the internal structure of an adaptive circuit according to an embodiment of the present invention;

FIG. 8 shows a schematic diagram of the internal structure of the PFC freewheeling circuit according to an embodiment of the present invention.

detailed description

In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from those described here, therefore, the protection scope of the utility model is not limited by the following limitations of the specific embodiments disclosed.

Fig. 6 shows a schematic structural diagram of an intelligent power module according to an embodiment of the present invention.

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

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

Inside the HVIC tube 1101:

The ITRIP end is connected to the 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 first output end of the adaptive circuit 1105 is marked as ICON, Used to control the validity of HIN1-HIN3, LIN1-LIN3, and PFCINP signals; the second output end of the adaptive circuit 1105 is connected to the PFCC end of the HVIC tube 1101 .

There is also a bootstrap circuit structure inside the HVIC tube 1101 as follows:

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

The HIN1 terminal of the HVIC tube 1101 is the U-phase upper bridge arm signal input terminal UHIN of the intelligent power module 1100; the HIN2 terminal of the HVIC tube 1101 is the V-phase upper bridge arm signal input terminal VHIN of the intelligent power module 1100; the HIN3 terminal of the HVIC tube 1101 is the signal input terminal WHIN of the W-phase upper bridge arm of the intelligent power module 1100; the LIN1 terminal of the HVIC tube 1101 is the signal input terminal ULIN of the U-phase lower bridge arm of the intelligent power module 1100; The V-phase lower bridge arm signal input terminal VLIN; the LIN3 end of the HVIC tube 1101 is the W-phase lower bridge 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 HVIC tube 1101 The PFCINP terminal of the intelligent power module 1100 is used as the PFC control input terminal PFCIN of the intelligent power module 100; Among them, the six inputs UHIN, VHIN, WHIN, ULIN, VLIN, WLIN of the intelligent power module 1100 and the PFCIN terminal 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 positive terminal UVB of the power supply in the U-phase high-voltage area of the intelligent power module 1100; the HO1 end of the HVIC tube 1101 is connected to the gate of the U-phase upper bridge arm IGBT tube 1121; the 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 bridge arm IGBT tube 1124, the cathode of the FRD tube 1114, and the other end of the capacitor 1131, and serves as an intelligent power module 1100 The negative terminal UVS of the power supply in the U-phase high-voltage area.

The VB2 end of the HVIC tube 1101 is connected to one end of the capacitor 1132, and serves as the positive terminal VVB of the power supply in the V-phase high-voltage area 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; the 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 bridge arm IGBT tube 1125, the cathode of the FRD tube 1115, and the other end of the capacitor 1132, and serves as an intelligent power module 1100 The negative terminal VVS of the power supply in the V-phase high-voltage area.

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

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

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

The PFCO terminal of the HVIC tube 1101 is the output terminal of the PFC drive circuit, which 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 -VP of the intelligent power module 1100 The collector of the IGBT tube 1127 is connected to the cathode of the FRD tube 1117 and the first input and output end of the adaptive PFC freewheeling circuit 1141, and is used as the PFC end of the intelligent power module 1100, and the PFCC end is connected to the adaptive PFC freewheeling circuit 1141 input.

The second input and output terminal 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 Connected to the cathode of the intelligent power module 1100 and used as the high voltage input terminal P of the intelligent power module 1100, P is generally connected to 300V.

The function of HVIC tube 1101 is:

When ICON is high level, the logic input signals of 0 or 5V at 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, transmit the PFCINP signal 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, HO3 is the logic output signal of VS3 or VS3+15V, LO1, LO2, LO3, PFCO are logic output signals of 0 or 15V;

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

The effect of adaptive circuit 1105 is:

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

The function of adaptive PFC freewheeling circuit 1141 is:

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

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

In one embodiment of the present invention, the specific circuit structure of the adaptive circuit 1105 is shown in Figure 7, specifically:

One end of resistor 2016 is connected to VCC; the other end of resistor 2016 is connected to one end of resistor 2013 and the cathode of Zener diode 2011; the other end of resistor 2013 is connected to one end of PTC (PositiveTemperatureCoefficient, positive temperature coefficient) resistor 2012, the positive voltage 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 end of voltage source 2014; the negative end of voltage source 2014 is connected to GND; voltage comparator The output terminal of 2015 is connected to another input terminal of NOT gate 2017; The output terminal of NOT gate 2017 is connected to the input terminal of NOT gate 2027; The output terminal of NOT gate 2027 is connected to the control end of analog switch 2022 and as the second The output terminal, that is, the PFCC terminal;

ITRIP 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 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 terminal of the voltage comparator 2023 is connected to one of the input terminals of the NAND gate 2025; the output of the NAND gate 2025 The terminal 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 terminal of the NOT gate 2020 is used as ICON.

In one embodiment of the present utility model, the specific circuit structure of the PFC freewheeling circuit 1141 is shown in Figure 8, specifically:

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

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

The working principle and key parameter values of the above-mentioned embodiments are described below:

The clamping voltage of the Zener diode 2011 is designed to be 6.4V, and the resistor 2016 is designed to be 20kΩ, then a stable 6.4V voltage is generated at point B that is not affected by VCC voltage fluctuations; the PTC resistor 2012 is designed to be 10kΩ at 25°C and 10kΩ at 100°C 20kΩ; the resistance 2013 is designed to be 44kΩ, and the voltage source 2014 is designed to be 2V, then the voltage comparator 2015 outputs a low level when the temperature is below 100°C, and the voltage comparator 2015 outputs a high level when the temperature is above 100°C.

Therefore, if and only when 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 ITRIP is compared with the voltage of the voltage source 2018, and when the ITIRP voltage>0.5V, the voltage comparator 2010 outputs a high level and makes ICON generate a low level to stop the module from working; and, At this time, the first input and output terminal of the PFC freewheeling circuit 1141 is connected to the cathode of the PFC tube 2002, and the second input and output terminal 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 compared with the voltages of 0.5V and 0.6V at the same time. 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> 0.5V, it will last for a period of time to make the voltage comparator 2010 and the voltage comparator 2023 output high level to make the NAND gate 2025 output low level. This duration depends on the rising slope of ITRIP; and, at this time, the PFC The first input and output terminal of the freewheeling circuit 1141 is connected to the cathode of the PFC tube 2001 , and the second input and output terminal of the PFC freewheeling circuit 1141 is connected to the anode of the PFC tube 2001 .

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

Under the same process, FRD tube 2001 and FRD tube 2002 are obtained by adjusting the concentration of platinum and the relationship between the reverse recovery time of the FRD tube and the forward conduction pressure drop. The FRD tube 2001 can choose the FRD tube with a shorter reverse recovery time, For the FRD tube 2002, select the FRD tube with a smaller forward voltage drop.

It can be seen from the technical solutions of the above embodiments that the intelligent power module proposed by the utility model is completely compatible with the existing intelligent power module, and can be directly replaced with the existing intelligent power module. When the temperature is low, ITRIP is compared with a lower voltage to ensure the sensitivity of the overcurrent protection of the intelligent power module. When the temperature is high, ITRIP is compared with a higher voltage to take into account the stability of the intelligent power module ; and, when the temperature is low, the PFC circuit uses the FRD tube with a lower forward voltage drop to obtain lower power consumption, and when the temperature is higher, the PFC uses the FRD tube with a shorter reverse recovery time to reduce the power consumption of the circuit Voltage noise; so that the intelligent power module of the present invention maintains the stability of the system under the premise that the normal protection mechanism continues to take effect, and at the same time improves the user satisfaction of the product.

The technical scheme of the utility model has been described in detail above in conjunction with the accompanying drawings. The utility model proposes a new smart power module, which can effectively reduce the smart power while ensuring that the smart power module can work normally with low power consumption at room temperature. Chance of the module being falsely triggered at high temperatures.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. a SPM, it is characterised in that including:

Brachium pontis signal input part, three-phase low reference voltage end, current detecting end and PFC end under brachium pontis signal input part, three-phase on three-phase；

HVIC manages, it is provided with on described HVIC pipe and is respectively connecting on described three-phase the terminals of brachium pontis signal input part under brachium pontis signal input part and described three-phase, and the first port corresponding to described current detecting end, described first port is connected with described current detecting end by connecting line；

Sampling resistor, described three-phase low reference voltage end and described current detecting end be connected to the first end of described sampling resistor, and the second end of described sampling resistor is connected to the low-pressure area power supply negative terminal of described SPM；

Adaptive circuit, the input of described adaptive circuit is connected to described first port, and the first outfan of described adaptive circuit is as the Enable Pin of described HVIC pipe；

PFC freewheeling circuit, the input of described PFC freewheeling circuit is connected to the second outfan of described adaptive circuit, first input/output terminal of described PFC freewheeling circuit is connected to described PFC end, second input/output terminal of described PFC freewheeling circuit is connected to the high voltage input of described SPM, the level signal that described PFC freewheeling circuit inputs according to the input of described PFC freewheeling circuit, it is achieved forward conduction voltage drop is less than the function of the fly-wheel diode of predetermined pressure drop value or realizes the Reverse recovery duration function less than the fly-wheel diode of scheduled duration；

Wherein, described adaptive circuit is when the temperature of described SPM is less than predetermined temperature value, exported the signal of the first level by described second outfan, and exported the enable signal of corresponding level according to the magnitude relationship between value and first setting value of the input signal of the input of described adaptive circuit by described first outfan；Described adaptive circuit is when the temperature of described SPM is higher than described predetermined temperature value, signal by described second outfan output second electrical level, and being exported the enable signal of corresponding level by described first outfan according to the magnitude relationship between value and second setting value of the input signal of the input of described adaptive circuit, described second setting value is more than described first setting value.

SPM the most according to claim 1, it is characterised in that:

Described adaptive circuit is when the temperature of described SPM is less than predetermined temperature value, if the value of the input signal of the input of described adaptive circuit is more than or equal to described first setting value, then exported the enable signal of described first level by described first outfan, to forbid that described HVIC pipe works；Otherwise, the enable signal of described second electrical level is exported by described first outfan, to allow described HVIC pipe to work；

Described adaptive circuit is when the temperature of described SPM is higher than described predetermined temperature value, if the value of the input signal of the input of described adaptive circuit is more than or equal to described second setting value, then exported the enable signal of described first level by described first outfan；Otherwise, the enable signal of described second electrical level is exported by described first outfan.

SPM the most according to claim 1, it is characterised in that described adaptive circuit includes:

First resistance, first end of described first resistance is connected to the power supply positive pole of described adaptive circuit, second end of described first resistance is connected to the negative electrode of Zener diode, the anode of described Zener diode is connected to the power supply negative pole of described adaptive circuit, and the power supply positive pole of described adaptive circuit and negative pole are respectively connecting to low-pressure area power supply anode and the negative terminal of described SPM；

Second resistance, the first end of described second resistance is connected to the second end of described first resistance, and the second end of described second resistance is connected to the positive input terminal of the first voltage comparator；

Critesistor, the first end of described critesistor is connected to the second end of described second resistance, and the second end of described critesistor is connected to the anode of described Zener diode；

First voltage source, the negative pole of described first voltage source is connected to the anode of described Zener diode, the positive pole of described first voltage source is connected to the negative input end of described first voltage comparator, the outfan of described first voltage comparator is connected to the input of the first not gate, the outfan of described first not gate is connected to the input of the second not gate, the outfan of described second not gate is connected to the control end of the first analog switch, and as the second outfan of described adaptive circuit；

Second voltage comparator, the positive input terminal of described second voltage comparator is as the input of described adaptive circuit, the negative input end of described second voltage comparator is connected to the positive pole of the second voltage source, the negative pole of described second voltage source is connected to the power supply negative pole of described adaptive circuit, and the outfan of described second voltage comparator is connected to the first selection end and first input end of the first NAND gate of described first analog switch；

Tertiary voltage comparator, the positive input terminal of described tertiary voltage comparator is connected to the positive input terminal of described second voltage comparator, the negative input end of described tertiary voltage comparator is connected to the positive pole in tertiary voltage source, the negative pole in described tertiary voltage source is connected to the power supply negative pole of described adaptive circuit, the outfan of described tertiary voltage comparator is connected to the second input of described first NAND gate, the outfan of described first NAND gate is connected to the input of the 3rd not gate, the outfan of described 3rd not gate is connected to the second selection end of described first analog switch, the fixing end of described first analog switch is connected to the input of the 4th not gate, the outfan of described 4th not gate is as the first outfan of described adaptive circuit.

SPM the most according to claim 1, it is characterised in that described PFC freewheeling circuit includes two fly-wheel diodes；

Described PFC freewheeling circuit, when the input of described PFC freewheeling circuit inputs the signal of described first level, selects the fly-wheel diode that in said two fly-wheel diode, forward conduction voltage drop is relatively low to access circuit；

Described PFC freewheeling circuit, when the input of described PFC freewheeling circuit inputs the signal of described second electrical level, selects the fly-wheel diode that in said two fly-wheel diode, reverse recovery time is shorter to access circuit.

SPM the most according to claim 4, it is characterised in that described PFC freewheeling circuit includes:

Second analog switch, the fixing end of described second analog switch is as the first input/output terminal of described PFC freewheeling circuit, first selection end of described second analog switch is connected to the negative electrode of the first fly-wheel diode, and the second selection end of described second analog switch is connected to the negative electrode of the second fly-wheel diode；

3rd analog switch, the fixing end of described 3rd analog switch is as the second input/output terminal of described PFC freewheeling circuit, first selection end of described 3rd analog switch is connected to the anode of described first fly-wheel diode, and the second selection end of described 3rd analog switch is connected to the anode of described second fly-wheel diode；

Wherein, the end that controls of described 3rd analog switch is connected with the control end of described second analog switch, and as the input of described PFC freewheeling circuit.

SPM the most according to claim 1, it is characterised in that be additionally provided with the signal output part of PFC drive circuit on described HVIC pipe, described SPM also includes:

First power switch pipe and the first diode, the anode of described first diode is connected to the emitter stage of described first power switch pipe, the negative electrode of described first diode is connected to the colelctor electrode of described first power switch pipe, the base stage of described first power switch pipe is connected to the signal output part of described PFC drive circuit, the emitter stage of described first power switch pipe is as the PFC low reference voltage end of described SPM, and the colelctor electrode of described first power switch pipe is as described PFC end.

SPM the most according to any one of claim 1 to 6, it is characterised in that also include:

Bridge arm circuit on three-phase, the signal output part of corresponding phase during the input of bridge arm circuit is connected to the three-phase high-voltage district of described HVIC pipe in each phase in bridge arm circuit on described three-phase；

Bridge arm circuit under three-phase, the signal output part of corresponding phase during the input of bridge arm circuit is connected to the three-phase low-voltage district of described HVIC pipe under each phase in bridge arm circuit under described three-phase.

SPM the most according to claim 7, it is characterised in that in described each phase, bridge arm circuit includes:

Second power switch pipe and the second diode, the anode of described second diode is connected to the emitter stage of described second power switch pipe, the negative electrode of described second diode is connected to the colelctor electrode of described second power switch pipe, the colelctor electrode of described second power switch pipe is connected to the high voltage input of described SPM, the base stage of described second power switch pipe is as the input of bridge arm circuit in described each phase, and the emitter stage of described second power switch pipe is connected to the higher-pressure region power supply negative terminal of described SPM correspondence phase.

SPM the most according to claim 8, it is characterised in that under described each phase, bridge arm circuit includes:

3rd power switch pipe and the 3rd diode, the anode of described 3rd diode is connected to the emitter stage of described 3rd power switch pipe, the negative electrode of described 3rd diode is connected to the colelctor electrode of described 3rd power switch pipe, the colelctor electrode of described 3rd power switch pipe is connected to the anode of described second diode in the upper bridge arm circuit of correspondence, the base stage of described 3rd power switch pipe is as the input of bridge arm circuit under described each phase, and the emitter stage of described 3rd power switch pipe is as the low reference voltage end of the corresponding phase of described SPM.

10. an air-conditioner, it is characterised in that including: SPM as claimed in any one of claims 1-9 wherein.