CN205792230U - SPM and air-conditioner - Google Patents

Abstract

The utility model provides an intelligent power module and an air conditioner. The first output terminal of the adaptive circuit in the intelligent power module is used as the enabling terminal of the HVIC tube; the first input and output terminals and the second input and output terminals of the PFC switch circuit are , the third input and output terminals and the fourth input and output terminals are respectively connected to the signal output terminal of the PFC drive circuit, the PFC low voltage reference terminal, the PFC terminal and the second output terminal of the adaptive circuit; the PFC switch circuit is connected according to its fourth input The level signal input at the output terminal realizes the function of a power switch tube with a first switching speed and a first saturation voltage drop, or realizes the function of a power switch tube with a second switching speed and a second saturation voltage drop; an adaptive circuit According to the size of the input signal at its input end, it outputs an enable signal of corresponding level through its first output end, and outputs a level signal of a power switch tube controlling the PFC switch circuit to realize corresponding functions through its second output end.

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 (IPM) is a power driver that integrates power electronic discrete devices and integrated circuit technology. The intelligent power module includes power switching devices and high-voltage drive circuits, and has overvoltage, overcurrent and overheating 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.

The structure 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 a PFC (Power Factor Correction, 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 (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) tube 127 is continuously in the switching state and the FRD tube 131 is continuously in the continuous state. Flow state, the frequency is generally 2 to 4 times the switching frequency of LIN1~LIN3, HIN1~HIN3, and has no direct relationship 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, the voltage noise when IGBT tubes 121 to 127 are switched and the current noise when FRD (Fast Recovery Diode) tubes 111 to 116 and FRD tubes 131 are freewheeling will be coupled with each other, and the input pins are affected.

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 that is 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.

In fact, because the reverse recovery time and reverse recovery current of the FRD tube are related to the conduction speed of the IGBT tube, the faster the conduction speed of the IGBT tube, the longer the reverse recovery time, so the higher the IGBT switching speed requirement Occasionally, the probability of MTRIP being triggered is increasing. As shown in Figure 5, when the slope tf when the IGBT is turned on is small, the voltage fluctuation caused by the reverse recovery effect of the FRD is not enough to trigger MTRIP, and when the slope tf is large when the IGBT is turned on, MTRIP is triggered. Stop the system from working. In the case that the switching speed of the IGBT has no correlation with the MTRIP trigger mechanism, although this false trigger will recover after a period of time without causing damage to the system, it will undoubtedly cause trouble to the user. For example, in the application of inverter air conditioners, the user pursues energy saving and hopes that the PFC will continue to work, but if the chances of MTRIP being falsely triggered are multiplied, then when MTRIP is falsely triggered, the air conditioning system will stop working because it is mistaken for overcurrent 3 to 5 minutes, so that users cannot get cold air during this time, which is one of the main reasons why the air conditioning system receives complaints from customers due to insufficient cooling capacity. At the same time, if the smart power module of the current technology does not automatically adjust the working state of the PFC circuit in some occasions where the wiring of the application circuit is not well considered, it will undoubtedly increase the threshold for using the smart power module and affect the popularization of the smart power module.

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.

For this reason, one purpose of this utility model is to propose a new intelligent power module, which can adjust the working state of the PFC circuit by judging the wiring environment of the application circuit by itself under the premise of realizing overcurrent protection, so as to improve the intelligent power. The stability of the module during operation.

Another purpose of the utility model is to provide an air conditioner with the intelligent power module.

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 terminal, three-phase lower bridge arm signal input terminal, three-phase low voltage reference terminal, current detection terminal, PFC terminal and PFC low voltage reference terminal; HVIC (High Voltage Integrated Circuit, high voltage integrated circuit) tube, The HVIC tube is provided with terminals 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, and a first port connected to the current detection terminal. The HVIC tube The signal output terminal of the PFC drive circuit is also arranged on the PFC; the adaptive circuit, the input terminal of the adaptive circuit is connected to the first port, and the first output terminal of the adaptive circuit is used as the enable of the HVIC tube Terminal; PFC switch circuit, the first input-output terminal, the second input-output terminal, the third input-output terminal and the fourth input-output terminal of the PFC switch circuit are respectively connected to the signal output terminal of the PFC drive circuit, the The PFC low-voltage reference terminal, the PFC terminal and the second output terminal of the adaptive circuit; wherein, the PFC switch circuit realizes a first switching speed and a level signal input according to its fourth input and output terminal The function of the power switch tube with the first saturation voltage drop, or the function of the power switch tube with the second switching speed and the second saturation voltage drop, the first switching speed is greater than the second switching speed, and the first The saturation voltage drop is greater than the second saturation voltage drop; the adaptive circuit outputs an enabling signal of a corresponding level through its first output terminal according to the size of the input signal at its input terminal, and outputs a control signal through its second output terminal The PFC switch circuit realizes the level signal of the power switch tube with corresponding functions.

According to the intelligent power module of the embodiment of the present utility model, the self-adaptive circuit outputs the use of the corresponding level through its first output terminal according to the size of the input signal at its input terminal (that is, the first port, that is, the current detection terminal). can ensure that the intelligent power module realizes overcurrent protection; at the same time, the self-adaptive circuit outputs the level signal of the power switch tube that controls the PFC switch circuit to realize the corresponding function through its second output terminal according to the size of the input signal at its input terminal , so that the adaptive circuit can determine the wiring environment of the application circuit according to the input signal at its input terminal, and control the PFC switch circuit to realize the function of a power switch tube with a fast switching speed and a high saturation voltage drop or realize a slow switching speed and a saturation voltage drop The function of the lower power switch tube is to reduce the voltage noise in the circuit by adjusting the switching speed and saturation voltage drop of the power switch tube (implemented by the PFC switch circuit) in the PFC circuit, so as to ensure that the smart power module works properly. stability.

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 invention, when the value of the input signal at the input terminal of the self-adaptive circuit is smaller than the first set value, the enable signal of the first level is output through the first output terminal of the adaptive circuit, so as to allow the The HVIC tube works, and outputs the signal of the first level through its second output terminal; the value of the input signal of the adaptive circuit at its input terminal is greater than or equal to the first set value and less than the second set value value, output the enable signal of the first level through its first output terminal, and output the signal of the second level through its second output terminal; the value of the input signal of the adaptive circuit at its input terminal is greater than or equal to the second set value, output the enabling signal of the second level through its first output terminal to prohibit the operation of the HVIC tube, and output the second electrical level through its second output terminal flat signal.

According to the intelligent power module of the embodiment of the present invention, when the value of the input signal at the input end of the adaptive circuit is less than the first set value, it means that the current value in the application circuit of the intelligent power module is within the normal range, so it can be passed The first output terminal outputs a signal of the first level to allow the HVIC tube to work; at the same time, the signal of the first level is output through the second output terminal to enable the PFC switch circuit to achieve faster switching speed and higher saturation voltage drop power The function of the switching tube to ensure that the system has a high efficiency.

When the value of the input signal at the input terminal of the adaptive circuit is greater than or equal to the first set value and less than the second set value, it means that the current value in the application circuit of the intelligent power module is relatively large, but it is still in the state where the overcurrent protection does not need to be triggered Therefore, the signal of the first level can be output through the first output terminal to ensure that the HVIC tube continues to work; at the same time, the signal of the second level can be output through the second output terminal, so that the PFC switching circuit can achieve a slower switching speed and The function of the power switch tube with a lower saturation voltage drop can further reduce the interference of voltage noise on the overcurrent protection of the intelligent power module, and improve the stability of the intelligent power module.

When the value of the input signal at the input terminal of the adaptive circuit is greater than or equal to the second set value, it means that the current value in the application circuit of the intelligent power module has reached the range of triggering the overcurrent protection, so the first output terminal can output the second A two-level enable signal is used to prohibit the work of the HVIC tube and ensure the safety of the intelligent power module.

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

A first voltage comparator, the positive input terminal of the first voltage comparator is used as the input terminal of the adaptive circuit, the negative input terminal of the first voltage comparator is connected to the positive pole of the first voltage source, and the first voltage comparator is connected to the positive pole of the first voltage source. The negative pole of a voltage source is connected to the negative pole of the power supply of the adaptive circuit, the output terminal of the first voltage comparator is connected to the first input terminal of the NAND gate and the input terminal of the first NOT gate, and the first The output end of the NOT gate is connected to the input end of the second NOT gate, and the output end of the second NOT gate is used as the second output end of the adaptive circuit; the second voltage comparator, the second voltage comparator The positive input terminal is connected to the positive input terminal of the first voltage comparator, the negative input terminal of the second voltage comparator is connected to the positive pole of the second voltage source, and the negative pole of the second voltage source is connected to the self- The negative pole of the power supply of the adaptive circuit, the output terminal of the second voltage comparator is connected to the second input terminal of the NAND gate, the output terminal of the NAND gate is connected to the input terminal of the third NOT gate, the The output terminal of the third NOT gate is used as the first output terminal of the adaptive circuit; wherein, the positive pole and the negative pole of the power supply of the adaptive circuit are respectively connected to the positive terminal and the negative pole of the power supply in the low-voltage area of the intelligent power module. end.

According to an embodiment of the present invention, when the fourth input and output terminals of the PFC switch circuit input a signal of the first level, the power switching tube with the first switching speed and the first saturation voltage drop can be realized. The function; when the fourth input and output terminal of the PFC switch circuit inputs a signal of the second level, the function of the power switch tube with the second switching speed and the second saturation voltage drop is realized.

According to an embodiment of the present utility model, the PFC switch circuit includes:

The first analog switch, the fixed end of the first analog switch is used as the third input and output end of the PFC switch circuit, the first selection end of the first analog switch is connected to the collector of the first power switch tube, so The second selection end of the first analog switch is connected to the collector of the second power switch tube; the second analog switch, the fixed end of the second analog switch is used as the second input and output end of the PFC switch circuit, the The first selection end of the second analog switch is connected to the emitter of the first power switch tube, and the second selection end of the second analog switch is connected to the emitter of the second power switch tube; wherein, the The control terminal of the second analog switch is connected to the control terminal of the first analog switch, and serves as the fourth input and output terminal of the PFC switch circuit; the grid of the first power switch tube and the second power switch The gates of the transistors are connected together and serve as the first input and output terminals of the PFC switch circuit.

Wherein, the first power switch tube and the second power switch tube may be IGBTs.

According to an embodiment of the present invention, it also includes: a bootstrap circuit, the bootstrap circuit includes: a first bootstrap diode, the anode of the first bootstrap diode is connected to the power supply in the low-voltage area of the intelligent power module positive terminal, the cathode of the first bootstrap diode is connected to the positive terminal of the U-phase high-voltage area power supply of the intelligent power module; the second bootstrap diode, the anode of the second bootstrap diode is connected to the intelligent power supply The positive end of the power supply in the low-voltage area of the module, the cathode of the second bootstrap diode is connected to the positive end of the power supply in the V-phase high-voltage area of the intelligent power module; the third bootstrap diode, the anode of the third bootstrap diode Connected to the positive end of the power supply in the low-voltage area of the intelligent power module, and the cathode of the third bootstrap diode is connected to the positive end of the power supply in the high-voltage area of the W-phase 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 third power switch tube and a first diode, and the anode of the first diode is connected to the third power switch tube the emitter of the first diode, the cathode of the first 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 high voltage input terminal of the intelligent power module, so The base of the third power switch tube is used as the input terminal of the upper bridge arm circuit of each phase, and the emitter of the third 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 third 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 fourth power switch tube and a second diode, and the anode of the second diode is connected to the fourth power switch tube the emitter of the second diode, the cathode of the second diode is connected to the collector of the fourth power switch tube, and the collector of the fourth power switch tube is connected to the first diode in the corresponding upper bridge arm circuit. The anode of the diode, the base of the fourth power switch tube is used as the input terminal of the lower bridge arm circuit of each phase, and the emitter of the fourth power switch tube is used as the input terminal of the corresponding phase of the intelligent power module. Low Voltage Reference Terminal. Wherein, the fourth 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 switch 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 first input and output terminal of the PFC switch circuit 1127; the second input and output terminal of the PFC switch circuit 1127 is connected to the anode of the FRD tube 1117, and serves as the intelligent power module 1100 The PFC low voltage reference terminal-VP; the third input and output terminal of the PFC switch circuit 1127 is connected to the cathode of the FRD tube 1117 and the anode of the FRD tube 1141, and is used as the PFC terminal of the intelligent power module 1100, and connected to the PFCC terminal of the HVIC tube 1101 The fourth input and output terminal of the PFC switch circuit 1127 . The positive terminal of the power supply of the PFC switch circuit 1127 is connected to VCC, and the negative terminal of the power supply of the PFC switch circuit 1127 is connected to COM.

The cathode of FRD tube 1141, the collector of IGBT tube 1121, the cathode of FRD tube 1111, the collector of IGBT tube 1122, the cathode of FRD tube 1112, the collector of IGBT tube 1123, and the cathode of FRD tube 1113 are connected and used as smart power The high voltage input terminals P and P of the module 1100 are generally connected to 300V.

The function of HVIC tube 1101 is:

When ICON is low 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. That is, when the ICON outputs a low level, the HVIC tube 1101 is enabled.

When ICON is high level, HO1, HO2, HO3, LO1, LO2, LO3, and PFCO are all set to low level. That is, when the ICON outputs a high level, the HVIC tube 1101 stops working.

The effect of adaptive circuit 1105 is:

When detecting that the real-time value of ITRIP is less than a certain voltage value V1, ICON outputs a low level, and the second output terminal of the adaptive circuit 1105 outputs a low level; when detecting that the real-time value of ITRIP is greater than or equal to V1 but less than a certain value When a voltage value V2, the ICON outputs a low level, and the second output terminal of the adaptive circuit 1105 outputs a high level; when detecting that the real-time value of ITRIP is greater than or equal to V2, the ICON outputs a high level, and the adaptive circuit The second output terminal of 1105 outputs a high level; wherein, V2>V1.

The function of the PFC switch circuit 1127 is:

When PFCC is at a low level, the PFC switch circuit 1127 behaves as an IGBT tube with a faster turn-on speed and a larger saturation voltage drop at the first input and output terminal, the second input and output terminal, and the third input and output terminal; when PFCC is at a high level level, the PFC switch circuit 1127 behaves as an IGBT tube with a slow turn-on speed and a small saturation voltage drop at the first input-output terminal, the second input-output terminal, and the third input-output terminal.

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

ITRIP connects the positive input terminal of voltage comparator 2010, the positive input terminal of voltage comparator 2014; The negative input terminal of voltage comparator 2010 connects the positive terminal of voltage source 2018; The negative terminal of voltage source 2018 connects GND; The negative terminal of voltage comparator 2014 The negative input terminal 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 2011 and the input terminal of the NOT gate 2012; the output of the NOT gate 2012 The terminal is connected to the input terminal of the NOT gate 2013; the output terminal of the NOT gate 2013 is the second output terminal of the adaptive circuit 1105.

The output terminal of the voltage comparator 2014 is connected to the other input terminal of the NAND gate 2011 ; the output terminal of the NAND gate 2011 is connected to the input terminal of the NOT gate 2016 ; the output terminal of the NOT gate 2016 is the ICON terminal of the adaptive circuit 1105 .

In one embodiment of the present utility model, the specific circuit structure of the PFC switch circuit 1127 is shown in Figure 8, specifically:

The fourth input-output end of the PFC switch circuit 1127 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 third input-output end of the PFC switch circuit 1127; the fixed end of the analog switch 2004 It is the second input and output terminal of the PFC switch circuit 1127; the 1 selection terminal of the analog switch 2003 is connected to the collector of the IGBT tube 2001; the 0 selection terminal of the analog switch 2003 is connected to the collector of the IGBT tube 2002; the 1 selection terminal of the analog switch 2004 connected to the emitter of IGBT tube 2001; the 0 selection terminal of analog switch 2004 is connected to the emitter of IGBT tube 2002;

The working principle and key parameter values of the above-mentioned embodiments are described below: the voltage source 2018 may be designed as 0.5V, and the voltage source 2019 may be designed as 0.6V.

On the basis of the above parameters, the intelligent power module proposed by the utility model may have the following situations during actual work:

Case 1: When the ITRIP voltage<0.5V, the voltage comparator 2010 outputs a low level, so that the second output terminal of the adaptive circuit 1105 outputs a low level, and the NAND gate 2011 outputs a high level, so that the NOT gate 2016 outputs A low level makes the ICON output low. Because the second output terminal of the adaptive circuit 1105 outputs a low level, the first input and output terminal of the PFC switch circuit 1127 is connected with the cathode of the PFC tube 2002 at this time, and the second input and output terminal of the PFC switch circuit 1127 is connected with the cathode of the PFC tube 2002. connected to the anode.

Case 2: When the ITRIP voltage ≥ 0.6V, the voltage comparator 2010 outputs a high level, and the voltage comparator 2014 outputs a high level, and the NAND gate 2011 outputs a low level, so that the NOT gate 2016 outputs a high level to make the ICON output High level, the intelligent power module 1100 enters the protection state and stops working.

Case 3: When 0.5V≤ITIRP voltage<0.6V, the voltage comparator 2010 outputs a high level, so that the second output terminal of the adaptive circuit 1105 outputs a high level; and the voltage comparator 2014 outputs a low level, NAND The output terminal of the gate 2011 is high level, so that the output of the NOT gate 2016 is low and the ICON output is low; because the second output terminal of the adaptive circuit 1105 outputs a high level, the first input and output of the PFC switch circuit 1127 is now The terminal is connected to the cathode of the PFC tube 2001, and the second input and output terminal of the PFC switch circuit 1127 is connected to the anode of the PFC tube 2001.

Under the same process, adjust the relationship between the turn-on speed of the IGBT tube and the saturation voltage drop by adjusting the dopant concentration, etc., to obtain the IGBT tube 2001 and the IGBT tube 2002, and the IGBT tube 2001 selects the IGBT with a slower turn-on speed but a lower saturation voltage drop The IGBT tube 2002 selects an IGBT tube with a faster turn-on speed but a higher saturation voltage drop. Generally, the turn-on time of the IGBT tube 2001 (current rise and voltage drop time) is at the level of hundreds of nanoseconds, and the turn-on time of the IGBT tube 2002 (current rise and voltage drop time) is at the level of ten nanoseconds.

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. ITRIP is first compared with a lower voltage, under the premise of ensuring the sensitivity of the overcurrent protection of the intelligent power module, by adjusting the switching speed of the IGBT in the PFC circuit (realized by making the PFC switch circuit 1127 realize the corresponding function of the power switch tube) Reduce voltage noise and take into account the stability of the smart power module; when ITRIP is higher than a higher voltage, the smart power module is stopped to ensure the safety of the smart power module; On the premise that the mechanism continues to take effect, the stability, usability, and robustness of the system are maintained, user satisfaction of the product is improved, and product complaints are reduced.

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 intelligent power module, which can adjust the PFC circuit by judging the wiring environment of the application circuit by itself under the premise of realizing overcurrent protection. working state, so as to improve the stability of the intelligent power module when it is working.

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

HVIC manages, and described HVIC pipe is provided with to be respectively connecting to brachium pontis signal on described three-phase defeated Enter the terminals of brachium pontis signal input part under end and described three-phase, and be connected to described current detecting end The first port, described HVIC pipe is additionally provided with the signal output part of PFC drive circuit；

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

PFC on-off circuit, the first input/output terminal of described PFC on-off circuit, second input defeated Go out end, the 3rd input/output terminal and the 4th input/output terminal are connected respectively to described PFC and drive The signal output part of circuit, described PFC low reference voltage end, described PFC end and described self adaptation Second outfan of circuit；

Wherein, the level signal that described PFC on-off circuit inputs according to its 4th input/output terminal, Realize the function with the power switch pipe of the first switching speed and the first saturation voltage drop, or realization has The function of the power switch pipe of second switch speed and the second saturation voltage drop, described first switching speed is big In described second switch speed, described first saturation voltage drop is more than described second saturation voltage drop；Described from Adaptive circuit is according to the size of the input signal of its input, by the corresponding electricity of its first outfan output Flat enable signal, and realize phase by its second outfan output described PFC on-off circuit of control Answer the level signal of the power switch pipe of function.

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

Described adaptive circuit, when the value of the input signal of its input is less than the first setting value, passes through Its first outfan exports the enable signal of the first level, to allow described HVIC pipe to work, and leads to Cross its second outfan and export the signal of described first level；

Described adaptive circuit sets more than or equal to described first in the value of the input signal of its input When being worth and be less than the second setting value, the enable being exported described first level by its first outfan is believed Number, and by the signal of its second outfan output second electrical level；

Described adaptive circuit sets more than or equal to described second in the value of the input signal of its input During value, exported the enable signal of described second electrical level by its first outfan, described to forbid HVIC pipe works, and is exported the signal of described second electrical level by its second outfan.

SPM the most according to claim 1, it is characterised in that described self adaptation Circuit includes:

First voltage comparator, the positive input terminal of described first voltage comparator is as described self adaptation electricity The input on road, the negative input end of described first voltage comparator is connected to the positive pole of the first voltage source, The negative pole of described first voltage source is connected to the power supply negative pole of described adaptive circuit, and described first The outfan of voltage comparator is connected to first input end and the input of the first not gate of NAND gate, institute The outfan stating the first not gate is connected to the input of the second not gate, and the outfan of described second not gate is made The second outfan for described adaptive circuit；

Second voltage comparator, the positive input terminal of described second voltage comparator is connected to described first electricity The positive input terminal of pressure comparator, the negative input end of described second voltage comparator is connected to the second voltage source Positive pole, the negative pole of described second voltage source is connected to the power supply negative pole of described adaptive circuit, The outfan of described second voltage comparator is connected to the second input of described NAND gate, described and non- The outfan of door is connected to the input of the 3rd not gate, the outfan of described 3rd not gate as described from First outfan of adaptive circuit；

Wherein, power supply positive pole and the negative pole of described adaptive circuit is connected respectively to described intelligence The low-pressure area power supply anode of energy power model and negative terminal.

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

Described PFC on-off circuit is when its 4th input/output terminal inputs the signal of the first level, real Now there is the function of the power switch pipe of described first switching speed and described first saturation voltage drop；

Described PFC on-off circuit is when the signal of its 4th input/output terminal input second electrical level, real Now there is the function of the power switch pipe of described second switch speed and described second saturation voltage drop.

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

First analog switch, the fixing end of described first analog switch is as described PFC on-off circuit The 3rd input/output terminal, described first analog switch first selection end be connected to the first power switch The colelctor electrode of pipe, the second selection end of described first analog switch is connected to the collection of the second power switch pipe Electrode；

Second analog switch, the fixing end of described second analog switch is as described PFC on-off circuit The second input/output terminal, described second analog switch first selection end be connected to described first power The emitter stage of switching tube, the second selection end of described second analog switch is connected to described second power and opens Close the emitter stage of pipe；

Wherein, the control end phase controlling end and described first analog switch of described second analog switch Connect, and as the 4th input/output terminal of described PFC on-off circuit；Described first power switch pipe Grid be connected with the grid of described second power switch pipe, and as described PFC on-off circuit First input/output terminal.

SPM the most according to any one of claim 1 to 5, its feature exists In, also including: boostrap circuit, described boostrap circuit includes:

First bootstrap diode, the anode of described first bootstrap diode is connected to described intelligent power mould The low-pressure area power supply anode of block, the negative electrode of described first bootstrap diode is connected to described intelligence merit The U phase higher-pressure region power supply anode of rate module；

Second bootstrap diode, the anode of described second bootstrap diode is connected to described intelligent power mould The low-pressure area power supply anode of block, the negative electrode of described second bootstrap diode is connected to described intelligence merit The V phase higher-pressure region power supply anode of rate module；

3rd bootstrap diode, the anode of described 3rd bootstrap diode is connected to described intelligent power mould The low-pressure area power supply anode of block, the negative electrode of described 3rd bootstrap diode is connected to described intelligence merit The W phase higher-pressure region power supply anode of rate module.

SPM the most according to any one of claim 1 to 5, its feature exists In, also include:

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

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

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

3rd power switch pipe and the first diode, the anode of described first diode is connected to described The emitter stage of three power switch pipes, the negative electrode of described first diode is connected to described 3rd power switch The colelctor electrode of pipe, the colelctor electrode of described 3rd power switch pipe is connected to the height of described SPM Voltage input end, the base stage of described 3rd power switch pipe is as bridge arm circuit defeated in described each phase Entering end, the emitter stage of described 3rd power switch pipe is connected to the height of described SPM correspondence phase Nip power supply negative terminal.

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

4th power switch pipe and the second diode, the anode of described second diode is connected to described The emitter stage of four power switch pipes, the negative electrode of described second diode is connected to described 4th power switch The colelctor electrode of pipe, the colelctor electrode of described 4th power switch pipe is connected in the upper bridge arm circuit of correspondence The anode of described first diode, the base stage of described 4th power switch pipe is as bridge under described each phase The input of arm circuit, the emitter stage of described 4th power switch pipe is as described SPM The low reference voltage end of corresponding phase.

10. an air-conditioner, it is characterised in that including: institute as any one of claim 1 to 9 The SPM stated.