CN108092497B

CN108092497B - Intelligent power module and air conditioner

Info

Publication number: CN108092497B
Application number: CN201810055931.XA
Authority: CN
Inventors: 冯宇翔
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2018-01-18
Filing date: 2018-01-18
Publication date: 2020-08-14
Anticipated expiration: 2038-01-18
Also published as: CN108092497A

Abstract

The invention provides an intelligent power module and an air conditioner, wherein an adjusting circuit is additionally arranged between each driving circuit and a corresponding IGBT (insulated gate bipolar transistor) tube in the intelligent power module, the adjusting circuit can detect the change of the power supply voltage value of a low-voltage area of the intelligent power module in real time, and when the voltage value is too low due to the fluctuation of a low-voltage power supply, the module stops outputting, so that the IGBT tube in the module accumulates charges due to the energy storage of a driving motor, the charges accumulated by the IGBT tube in the module can be discharged, and when the power supply voltage returns to normal operation, the charges are continuously discharged completely and rapidly in a proper time by timing selection, so that the impact of the charges on the internal circuit of the module is avoided to influence the reliability of the operation of the module.

Description

Intelligent power module and air conditioner

Technical Field

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

Background

An intelligent Power module, i.e., ipm (intelligent Power module), is a Power driving product combining Power electronics and integrated circuit technology. The intelligent power module integrates a power switch device and a high-voltage driving circuit, and is internally provided with fault detection circuits such as overvoltage, overcurrent and overheat. The intelligent power module receives a control signal of the MCU to drive a subsequent circuit to work on one hand, and sends a state detection signal of the system back to the MCU on the other hand. The intelligent power module is especially suitable for frequency converter of driving motor and various inverter power sources, and is an ideal power electronic device for frequency conversion speed regulation, metallurgical machinery, electric traction, servo drive and frequency conversion household appliances.

As shown in fig. 1, a Circuit structure of a conventional IPM module 100 includes HVIC transistors (High voltage integrated Circuit chips) 111, three-phase upper arm IGBT transistors (Insulated gate bipolar transistors) 111, 112, 113, and three-phase lower

arm IGBT transistors

114, 115, 116, where the HVIC transistors 111 include therein a UH driving Circuit 101, a VH driving Circuit 102, and a WH driving Circuit 103 connected to the three-phase upper arm IGBT transistors, and a UL driving Circuit 104, a VL driving Circuit 105, and a WL driving Circuit 106 connected to the three-phase lower arm IGBT transistors, and the six driving circuits respectively drive six corresponding IGBT transistors to switch states under the control of six control signals input by the IPM module 100. The recommended circuit of the IPM module 100 during actual operation is shown in fig. 2, the IPM module 100 is connected to the MCU200 through six input control signals, the U, V, W three-phase output end of the IPM module 100 is connected to the three-phase winding of the motor 139, the

capacitors

135, 136, 137 are bootstrap capacitors respectively connecting the three-phase output terminal and the positive end of the corresponding phase high-voltage power supply, the six control signals output by the MCU200 control the switching states of the six IGBT tubes of the IPM module 100 to switch, and output the corresponding three-phase driving signals to the motor 139, thereby driving the motor 139 to operate. In practical applications, the IPM module 100 has a severe working environment and unstable power supply, the sudden power down may be caused by a voltage fluctuation of the low voltage power supply of the IPM module 100 or the like, the IPM module 100 abruptly stops outputting, and an induced electromotive force is generated due to the inductive energy storage of the motor 139, the induced electromotive force is transmitted to the IPM module 100, so that the IGBT tube therein accumulates charges, cannot be discharged in time within a short time, and if the IPM module 100 resumes normal operation when the power supply is restored to steady, the residual charge on the IGBT tube inside the IPM module may discharge to the IPM module 100 in the next normal switching cycle, which affects the effective driving of the load motor by the IPM module, and unnecessary charge impact is possibly formed on the internal circuit of the IPM module, the long-term reliability of the IPM module is influenced, and the large-area popularization of the intelligent power module in the field of frequency conversion is hindered.

Disclosure of Invention

The invention mainly aims to provide an intelligent power module and an air conditioner controller, and aims to solve the problems that the effective driving of a motor is influenced and the working reliability of the module is influenced due to the fact that the electric charge accumulated in an IGBT (insulated gate bipolar transistor) tube in the intelligent power module cannot be discharged in a short time because of the instability of a power supply in the working process of the intelligent power module and the impact is generated on the module.

In order to achieve the purpose, the intelligent power module provided by the invention comprises a three-phase upper bridge arm IGBT tube, a three-phase lower bridge arm IGBT tube, a driving circuit and an adjusting circuit, wherein the driving circuit and the adjusting circuit correspond to each IGBT tube in the three-phase upper bridge arm IGBT tube and the three-phase lower bridge arm IGBT tube;

the output end of each driving circuit is connected with the signal input end of each corresponding adjusting circuit, and the signal output end of each adjusting circuit is connected with the grid electrode of each corresponding IGBT;

the positive electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube in the three-phase upper bridge arm IGBT tube is connected with the positive electrode of the high-voltage area power supply of the corresponding phase, and the negative electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube in the three-phase upper bridge arm IGBT tube is connected with the negative electrode of the high-voltage area power supply of the corresponding phase; the positive electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube in the three-phase lower bridge arm IGBT tube is connected with the positive electrode of the low-voltage power supply of the intelligent power module, and the negative electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube in the three-phase lower bridge arm IGBT tube is connected with the negative electrode of the low-voltage power supply of the intelligent power module; wherein the content of the first and second substances,

the adjusting circuit is used for detecting the voltage value of a power supply end of the adjusting circuit, when the voltage value is smaller than a preset voltage threshold value, the adjusting circuit cuts off a driving signal output by the driving circuit to the corresponding IGBT tube and starts timing, when the voltage value is larger than or equal to the preset voltage threshold value, if the timing time does not reach a first target time, the adjusting circuit outputs a low-resistance and high-resistance alternate continuous state to discharge the charge of the corresponding IGBT tube, wherein the duty ratio of the low-resistance state is continuously changed from small to large; if the timing time reaches the first target time and does not reach the second target time, the adjusting circuit outputs a low resistance state to continuously discharge the charges of the corresponding IGBT tube, and if the timing time reaches the second target time, the driving circuit is controlled to output a driving signal to the corresponding IGBT tube.

In one possible design, each of the adjusting circuits includes a voltage detecting module, a counting module, a signal generator, an output module, and a first switch;

the input end of the voltage detection module, the power end of the counting module, the power end of the signal generator and the power end of the output module are interconnected to form the power end of the adjusting circuit; the output end of the voltage detection module is connected with the input end of the counting module, and the output end of the voltage detection module is connected with the control end of the first switch; the first output end of the counting module is connected with the first control end of the output module, the second output end of the counting module is connected with the control end of the signal generator, the third output end of the counting module is connected with the second control end of the output module, the output end of the signal generator is connected with the third control end of the output module, the input end of the output module is the signal input end of the adjusting circuit, the output end of the output module is connected with the input end of the first switch, and the output end of the first switch is the signal output end of the adjusting circuit; wherein the content of the first and second substances,

the voltage detection module is used for controlling the counting module to start timing when detecting that the voltage value of the power end of the adjusting circuit is smaller than a preset voltage threshold, outputting a first control signal to control the first switch to be switched from on to off during normal work, and outputting a second control signal to control the first switch to be switched on when detecting that the voltage value of the power end of the adjusting circuit is larger than or equal to the preset voltage threshold;

the counting module is used for simultaneously outputting a first trigger signal to the output module by a first output end and a third output end of the counting module when the timing is started, meanwhile, the second output end of the counting module outputs a control signal of voltage change to the control end of the signal generator, so that the signal generator outputs a pulse signal with a gradually increasing duty cycle to the third control terminal of the output module, the first trigger signal and the pulse signal output by the signal generator control the output port of the output module to be in a low-resistance and high-resistance alternate continuous state, and the time of the low-resistance state is gradually increased, when the timing time exceeds the first target time and does not reach a second target time, a third output end of the counting module outputs a second trigger signal to the output module so as to control an output port of the output module to be in a low-resistance state;

when the voltage value is larger than or equal to the preset voltage threshold value, if the timing time does not reach a first target time, the low-resistance and high-resistance alternative continuous state of the output port of the output module discharges the charges of the corresponding IGBT tube, if the timing time exceeds the first target time and does not reach a second target time, the low-resistance state of the output port of the output module continuously discharges the charges of the corresponding IGBT tube, and when the timing time reaches the second target time, the first output port of the counting module outputs a third trigger signal to control the driving circuit to output a driving signal to the corresponding IGBT tube.

In one possible design, when the counting module is timing, the second output end of the counting module outputs a control signal with gradually reduced voltage to the control end of the signal generator;

the signal generator is also used for collecting the voltage value of the control end of the signal generator at the rising edge of the pulse signal output by the signal generator, and determining the duty ratio of the pulse signal output by the signal generator according to the voltage value of the control end of the signal generator.

In one possible design, the counting module includes a first not gate and a counter;

the input end of the first not gate is the input end of the counting module, and the output end of the first not gate is connected with the input end of the counter;

the first output end of the counter is the first output end of the counting module, and the second output end of the counter is the second output end of the counting module.

In one possible design, the voltage detection module includes a comparator, a voltage source;

the in-phase end of the comparator is connected with the positive electrode of the power end of the adjusting circuit, the positive electrode of the voltage source is connected with the reverse-phase end of the comparator, and the negative electrode of the voltage source is connected with the negative electrode of the power end of the adjusting circuit.

In one possible design, the output module comprises a second switch, a third switch, a fourth switch, a first PMOS transistor and a second NMOS transistor;

the input end of the second switch, the second selection end of the third switch and the source electrode of the first PMOS tube are respectively connected with the positive electrode of the power end of the regulating circuit, the output end of the second switch is connected with the control end of the fourth switch, and the control end of the second switch is the first control end of the output module;

the control end of the third switch is the second control end of the output module, the first selection end of the third switch is the third control end of the output module, and the fixed end of the third switch is connected with the first selection end of the fourth switch;

the second selection end of the fourth switch is connected with the grid electrode of the first PMOS tube, the fixed end of the fourth switch is connected with the grid electrode of the second NMOS tube, the connecting end of the drain electrode of the first PMOS tube and the drain electrode of the second NMOS tube is the output end of the output module, and the source electrode of the second NMOS tube is connected with the negative electrode of the power end of the adjusting circuit.

In one possible design, the output module further includes a shaping unit;

the output end of the second switch is connected with the input end of the shaping unit, the output end of the shaping unit is the control end of the fourth switch, and the shaping unit shapes the control signal output by the second switch and outputs the control signal to the control end of the fourth switch.

In one possible design, the shaping unit includes a first not gate and a second not gate;

the input end of the first not gate is the input end of the shaping unit, the output end of the first not gate is connected with the input end of the second not gate, and the output end of the second not gate is the output end of the shaping unit.

In one possible design, each of the adjusting circuits further includes a shaping and amplifying module:

the input end of the shaping amplification module is connected with the signal input end of the adjusting circuit, the output end of the shaping amplification module is connected with the input end of the output module, and the shaping amplification module amplifies and shapes the signal at the signal input end of the adjusting circuit and outputs the signal to the input end of the output module.

In order to achieve the above object, the present invention further provides an air conditioner, wherein the air conditioner comprises an air conditioner controller, and the air conditioner controller comprises the intelligent power module.

The intelligent power module provided by the invention has the advantages that the adjusting circuit is additionally arranged between each driving circuit in the intelligent power module and the corresponding IGBT tube, the adjusting circuit can detect the change of the power supply voltage value of the IPM module in a low-voltage area in real time, when the voltage value is too low due to the fluctuation of the low-voltage power supply to stop the module from outputting so as to enable the IGBT tube in the module to accumulate charges, the driving signals of the driving output and the IGBT tube can be firstly cut off, the charges accumulated by the IGBT tube are firstly naturally discharged, the adjusting circuit starts timing at the moment, then when the low-voltage power supply recovers to be normal, if the voltage value is reduced to the recovery time which is longer than a second target time, the driving signals output by the driving circuit are directly controlled to the corresponding IGBT tube, and if the voltage value is reduced to the recovery time which is shorter than the second target time, a low-resistance state is output within the remaining time from the timing to the target time when the voltage is recovered, so as to And (3) performing quick discharge, if the time for recovering the voltage value is reduced to be less than the first target time, performing discharge in the first target time through the high-resistance and low-resistance alternative state output by the adjusting circuit, wherein the time of the low-resistance state is gradually increased, so that the discharge of the adjusting circuit is safer, and the low-resistance state is output for quick discharge when the time is timed to be longer than the first target time. The safe and quick discharge of the accumulated charges in the IGBT is ensured, the recovery time of the IPM module in low-voltage power supply voltage fluctuation can be shortened, the module can quickly recover normal work, and the influence of the impact of the accumulated charges on the module on the working reliability is avoided.

Drawings

FIG. 1 is a circuit block diagram of a prior art smart power module;

FIG. 2 is a circuit diagram of the actual operation of a prior art smart power module;

FIG. 3 is a circuit block diagram of the smart power module of the present invention;

fig. 4 is a specific circuit structure diagram of the output adjustment circuit in fig. 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an IPM module 4100 according to a first embodiment of the present invention, and for convenience of illustration, only the relevant parts related to the embodiment of the present invention are shown.

In this embodiment, the IPM module 4100 includes a three-phase upper arm IGBT tube, a three-phase lower arm IGBT tube, and a driving circuit and an adjusting circuit corresponding to each of the three-phase upper arm IGBT tube and the three-phase lower arm IGBT tube;

the adjusting circuit is used for detecting the voltage value of a power supply end of the adjusting circuit, when the voltage value is smaller than a preset voltage threshold value, the adjusting circuit cuts off a driving signal output by the driving circuit to the corresponding IGBT tube, when the voltage value is larger than or equal to the preset voltage threshold value, timing is started, if the timing time does not reach a first target time, the adjusting circuit outputs a low-resistance and high-resistance alternate continuous state to discharge the charge of the corresponding IGBT tube, and the duty ratio of the low-resistance state is continuously changed from small to large; if the timing time reaches the first target time and does not reach the second target time, the adjusting circuit outputs a low-resistance state to continuously discharge the charges of the corresponding IGBT tube, and if the timing time reaches the second target time, the driving circuit is controlled to output a driving signal to the corresponding IGBT tube.

In this embodiment, the three-phase upper arm IGBT tube is a U-phase upper arm IGBT tube 4121, a V-phase upper arm IGBT tube 4122, and a W-phase upper arm IGBT tube 4123, and the three-phase lower arm IGBT tube is a U-phase lower arm IGBT tube 4124, a V-phase lower arm IGBT tube 4125, and a W-phase lower arm IGBT tube 4126, and these six IGBT tubes respectively constitute power circuits corresponding to the three-phase upper arm and the three-phase lower arm of the IPM module, and provide corresponding three-phase current and voltage for the IPM module to drive the load motor.

In this embodiment, the driving circuit and the adjusting circuit corresponding to each of the three-phase upper arm IGBT tube and the three-phase lower arm IGBT tube are respectively:

a UH output adjusting circuit 14A connected with the U-phase upper bridge arm IGBT tube 4121, and a UH driving circuit 14 connected with the UH output adjusting circuit 14A;

a VH output adjustment circuit 24A connected to the V-phase upper arm IGBT tube 4122, a VH drive circuit 24 connected to the VH output adjustment circuit 24A;

a WH output adjusting circuit 34A connected to the W-phase upper arm IGBT tube 4123, a WH drive circuit 34 connected to the WH output adjusting circuit 34A;

a UL output adjusting circuit 44A connected to the U-phase lower arm IGBT tube 4124, and a UL driving circuit 44 connected to the UL output adjusting circuit 44A;

a WL output regulator circuit 54A connected to the W-phase lower arm IGBT tube 4125, a WL driver circuit 54 connected to the WL output regulator circuit 54A;

a VL output adjusting circuit 64A connected to the V-phase lower arm IGBT tube 4126, and a VL drive circuit 64 connected to the VL output adjusting circuit 64A;

in this embodiment, the six driving circuits and the adjusting circuits are integrated in the HVIC transistor 4400, in practical application, the six driving circuits and the adjusting circuits may also exist independently, or the three driving circuits and the adjusting circuits corresponding to the upper bridge arm are integrated in the HVIC transistor, and the three driving circuits and the adjusting circuits corresponding to the lower bridge arm are integrated in an LVIC transistor (Low voltage integrated Circuit chip), and the specific arrangement manner may be different according to the internal structure manner of the IPM module.

In this embodiment, the power supply positive terminal VCC of the HVIC tube 4400 is used as the low-voltage area power supply positive terminal VDD of the intelligent power module 4100, VDD is generally 15V, the power supply negative terminal GND of the HVIC tube 4400 is used as the low-voltage area power supply negative terminal COM of the intelligent power module 4100, and the corresponding high-voltage area power supply forms a high voltage due to the connection with the dc bus voltage, for example, the dc bus voltage is connected to about 300V through the P terminal;

a first input terminal HIN1 of the HVIC tube 4400 serves as an input terminal UHIN of a U-phase upper bridge arm of the intelligent power module 4100 and is connected with an input terminal of the UH driving circuit 14;

a second input terminal HIN2 of the HVIC tube 4400 serves as a V-phase upper bridge arm input terminal VHIN of the intelligent power module 4100 and is connected with the input terminal of the VH driving circuit 24;

a third input terminal HIN3 of the HVIC tube 4400 serves as a W-phase upper bridge arm input terminal WHIN of the intelligent power module 4100 and is connected with the input terminal of the WH driving circuit 34;

a fourth input terminal LIN1 of the HVIC tube 4400 serves as an input terminal ULINs of the U-phase lower bridge arm of the intelligent power module 4100 and is connected with the input terminal of the UL driving circuit 44;

a fifth input terminal LIN2 of the HVIC tube 4400 serves as a V-phase lower bridge arm input terminal VLIN of the intelligent power module 4100 and is connected with the input terminal of the VL drive circuit 54;

a sixth input terminal LIN3 of the HVIC 4400 is used as a W-phase lower bridge arm input terminal WLIN of the intelligent power module 4100 and is connected with the input terminal of the WL driving circuit 64;

the power supplies of the UL driver circuit 44, the WL driver circuit 54, and the VL driver circuit 64 are low-voltage power supplies of the intelligent power module 4100, and the power supply input of the output adjusting circuit 54A, VL of the UL output adjusting circuit 44A, WL output adjusting circuit 64A is the same as that of the low-voltage power supplies of the intelligent power module 4100;

the UH drive circuit 14, the VH drive circuit 24, and the WH drive circuit 34 have two sets of power supply inputs, one is a low-voltage region power supply of the intelligent power module 4100, and the other is a high-voltage region power supply of the corresponding phase, and the UH output adjustment circuit 14A, VH outputs the power supply input of the adjustment circuit 24A, WH output adjustment circuit 34A to be the same as the high-voltage region power supply of the drive circuit connected correspondingly, that is, the power supply inputs of the UH drive circuit 14 and the UH output adjustment circuit 14A are U-phase high-voltage power supplies UVB and UVS; the power supply inputs of the VH drive circuit 24 and the VH output adjustment circuit 24A are a V-phase high-voltage power supply VVB and VVS; the power supply inputs of the WH driving circuit 34 and the WH output adjusting circuit 34A are V-phase high-voltage power supply sources WVB and WVS.

In this embodiment, the dc bus voltage input end P of the IPM module 4100 is connected to the collector electrodes of the six IGBT tubes, and UN, VN and WN are the emitter output ends of the three lower arm IGBT tubes, respectively, and the IPM module 4100 further includes three

bootstrap capacitors

4133, 4132 and 4131, which are connected in parallel to the power supply ends of the corresponding high voltage regions, respectively.

In the normal working process of the IPM module 4100, only one of the input signals of the upper bridge arm and the lower bridge arm which are in the same phase in the six input signals of UHIN, VHIN, WHIN, ULIN, VLIN and WLIN can be at a high level, and the other input signal must be at a low level, that is, only one of UHIN and ULIN can be at a high level, only one of VHIN and VLIN can be at a high level, and only one of WHIN and WLIN can be at a high level.

Taking U-phase upper and lower bridge arm input signals UHIN, ULIN as an example, when UHIN inputs a low level, the ULIN must input a high level, at this time, UHIN is input to the gate of the U-phase upper bridge arm IGBT 4121 through the UH driving circuit 14 and the UH output adjusting circuit 14A to turn off the UHIN, and the ULIN is input to the gate of the U-phase lower bridge arm IGBT 4124 through the UL driving circuit 44 and the UL output adjusting circuit 44A to turn on the U-phase lower bridge arm IGBT 4124, at this time, the low-voltage region power supply VDD of the IPM module 4100 charges the bootstrap capacitor 4133 through the bootstrap circuit inside the UH driving circuit 14, and the low-voltage region power supply VDD reaches the negative terminal COM of the low-voltage region power supply through the capacitor bootstrap IGBT 4133 and the U-phase lower bridge arm IGBT 4124, and after a sufficient time, the voltage of the two ends of the capacitor approaches the voltage region, that is 15V, that is, at this time, the voltage of the U-phase high-voltage power; when UHIN inputs a high level and ULin must input a low level, the U-phase upper arm IGBT tube 4121 is turned on, the U-phase lower arm IGBT tube 4124 is turned off, and at the moment, the direct-current bus voltage reaches UVS close to 300V through the P end and the U-phase upper arm IGBT tube 4121, and the UVB end of the bootstrap capacitor 4133 is lifted to be close to 315V due to the fact that voltage close to 15V is already arranged at the two ends of the bootstrap capacitor 4133. Therefore, the voltages of the U-phase high-voltage power supply UVB and UVS vary with the difference of the U-phase upper and lower bridge arm input signals UHIN and ULIN, and if the high-level signal input by the U-phase upper bridge arm is relatively short and the electric quantity stored in the bootstrap capacitor 4133 is relatively large, the voltage of the UVB with respect to the UVS can be maintained above 14V, that is, the voltage of the UH output adjusting circuit 14A and the input power of the UH driving circuit 14 in the high-voltage region can be maintained above 14V.

Similarly, the input power of the high-voltage area of other phases can also be kept above 14V.

In this embodiment, each of the adjusting circuits includes a voltage detecting module, a counting module, an output module, and a first switch, and taking the UH output adjusting circuit 14A as an example, as shown in fig. 4, the UH output adjusting circuit 14A includes a voltage detecting module 10, a counting module 20, a signal generator 5013, an output module 30, and a first switch 5001.

A signal input end IN of the adjusting circuit is connected with a second selection end of the second switch 5007;

the input terminal of the voltage detection module 10, the power terminal of the counting module 20, the input terminal of the first switch 5001, the power terminal of the signal generator 5013 and the power terminal of the output module 30 are interconnected to constitute the power terminals of the adjusting circuit 14A; the output end of the voltage detection module 10 is connected to the input end of the counting module 20, and the output end of the voltage detection module 10 is connected to the control end of the first switch 5001; a first output end of the counting module 20 is connected with a first control end of the output module 30; a second output end of the counting module 20 is connected with the control end of the signal generator 5013, a third output end of the counting module 20 is connected with the second control end of the output module 30, and an output end of the signal generator 5013 is connected with the third control end of the output module 30; the input end of the output module 30 is a signal input end of the adjusting circuit 14A, the output end of the output module 30 is connected to the input end of the first switch 5001, and the output end of the first switch 5001 is a signal output end of the adjusting circuit 14A; wherein the content of the first and second substances,

the voltage detection module 10 is configured to output a first control signal to control the first switch 5001 to turn off from the on state during normal operation when detecting that the voltage value at the input end of the adjustment circuit 14A is smaller than a preset threshold, output a second control signal to control the first switch 5001 to turn on when detecting that the voltage value at the input end of the adjustment circuit 14A is greater than or equal to the preset voltage threshold, and simultaneously control the counting module 20 to start timing;

the counting module 20 is configured to, at the beginning of timing, simultaneously output a first trigger signal to the output module 30 through a first output terminal and a third output terminal of the counting module 20, and simultaneously output a control signal of voltage change to a control terminal of the signal generator 5013 through a second output terminal of the counting module 20, so that the signal generator 5013 outputs a pulse signal with a gradually increasing duty ratio to the third control terminal of the output module 30, and the output port of the output module 30 is in a low-resistance and high-resistance alternating continuous state, and the time of the low-resistance state gradually increases;

when the voltage value is greater than or equal to the preset voltage threshold, if the timing time does not reach the first target time, the low-resistance and high-resistance alternate continuous state of the output port of the output module 30 discharges the charges corresponding to the IGBT tube, when the timing time exceeds the first target time and does not reach the second target time, the low-resistance state of the output port of the output module 30 continuously discharges the charges corresponding to the IGBT tube, and when the timing time exceeds the second target time, the first output port of the counting module 20 outputs a third trigger signal to the output module 30 to control the driving circuit to output the driving signal to the corresponding IGBT tube.

Specifically, the voltage detection module 10 includes a comparator 5009 and a voltage source 5008;

the in-phase terminal of the comparator 5009 is connected to the positive terminal of the power supply terminal of the regulation circuit, the positive terminal of the voltage source 5008 is connected to the inverting terminal of the comparator 5009, and the negative terminal of the voltage source 5008 is connected to the negative terminal of the power supply terminal of the regulation circuit.

The counting module 10 includes a first not gate 5012 and a counter 5002;

the input end of the first not gate 5012 is the input end of the counting module 10, and the output end of the first not gate 5012 is connected with the input end of the counter 5002;

a first output end of the counter 5002 is a first output end of the counting module 10, a second output end of the counter 5002 is a second output end of the counting module 10, and a third output end of the counter 5002 is a third output end of the counting module 10.

The output module 30 includes a second switch 5011, a third switch 5014, a fourth switch 5007, a first PMOS transistor 5003, and a second NMOS transistor 5004;

the input end of the second switch 5011, the second selection end of the third switch 5014, and the source of the first PMOS transistor 5003 are respectively connected to the positive electrode of the power end of the adjustment circuit, the output end of the second switch 5011 is connected to the control end of the fourth switch 5007, and the control end of the second switch 5011 is the first control end of the output module 30;

the control end of the third switch 5014 is the second control end of the output module 30, the first selection end of the third switch 5014 is the third control end of the output module 30, and the fixed end of the third switch 5014 is connected to the first selection end of the fourth switch 5007;

a second selection end of the fourth switch 5007 is connected to the gate of the first PMOS transistor 5003, a fixed end of the fourth switch 5007 is connected to the gate of the second NMOS transistor 5004, a connection end between the drain of the first PMOS transistor 5003 and the drain of the second NMOS transistor 5004 is an output end of the output module 30, and a source of the second NMOS transistor 5004 is connected to the negative electrode VS1 of the power supply end of the adjusting circuit 14A.

It is worth noting that the first switch 5001, the second switch 5011, the third switch 5014, and the fourth switch 5007 described above may be analog electronic switches.

The operating principle of the adjusting circuit of the embodiment is as follows: in the normal working process of the IPM module 4100, six input signals can be driven and amplified by the corresponding driving circuit and then input to the gate of the IGBT of the corresponding bridge arm through the adjusting circuit to control the switching state of the gate, and finally output corresponding three-phase driving signals to drive the normal operation of the motor, because the operating environment of the IPM module 4100 is relatively bad and the power supply is unstable, the low-voltage power supply, namely VDD, of the IPM module 4100 can fluctuate, so that VDD is lower than the under-voltage protection value of the IPM module 4100, the driving module cannot normally work to turn off the output driving signals, and further the IPM module 4100 stops outputting suddenly, because the driving motor is an inductive load, the internal winding of the driving motor can store energy to generate induced electromotive force, which can be conducted to the IPM module 4100, and further charge is accumulated on the IGBT of the PM module 4100, at this time, the output adjusting circuit connected with the IGBT starts to play a role in discharging the charge on the IGBT, specifically as follows:

when the voltage detection module 10 detects that the voltage value of the power end of the adjustment circuit is smaller than the preset voltage threshold, specifically, when the voltage value of the non-inverting terminal of the comparator 5009 is smaller than the voltage value of the voltage source 5008 connected to the inverting terminal, the voltage detection module 10 outputs a first control signal, i.e., a low level signal, to the control terminal of the first switch 5001 and the counting module 20 through the output terminal of the comparator 5009, so as to control the first switch 5001 to be turned off from the on state during normal operation.

When the first switch 5001 is turned off, the output end of the output module 30 is disconnected from the output end OUT of the adjusting circuit, and at this time, the adjusting circuit cuts off the driving signal output by the driving circuit to the corresponding IGBT, that is, the output end OUT of the adjusting circuit is turned off, and at this time, the accumulated electric charge on the IGBT performs natural discharge.

When the input of the counting module 20 changes to low level, the first not gate 5012 of the counting module 20 changes to high level in reverse, and the level of the input of the counter 5002 changes from low level to high level at this time, so that the counter 5002 starts counting.

When the counter 5002 starts counting, the first output terminal and the third output terminal of the counter 5002 simultaneously output a first trigger signal which becomes low level, the first trigger signal causes the second switch 5011 to be disconnected and the fixed terminal of the third switch 5014 to be connected with the first selection terminal, the disconnection of the second switch 5011 further causes the control terminal of the third switch 5007 to be also connected with the second selection terminal to be connected with the first selection terminal, and at this time, the pulse signal output by the signal generator 5013 is loaded on the gate of the second NMOS transistor 5004 of the output module 30 through the third switch 5014 and the third switch 5007, so that the second NMOS transistor 5004 is in a switching state, that is, the output port of the output module 30 is in a low-resistance and high-resistance alternate continuous state; while the counter 5002 starts counting, the level output by the second output terminal thereof is changed from 0V to a preset voltage value, such as 5V, and the voltage thereof gradually decreases with the counting of the counter 5002, such as the counter 5002 counts once every 1us from the counting value 2048 and decreases by 1, and the voltage of the second output terminal thereof linearly decreases with the counting time, the control signal of the voltage change gradually increases the duty ratio of the pulse signal output by the signal generator 5013, and the time of the low impedance state of the output port of the output module 30 increases, wherein the signal generator 5013 operates on the principle that the voltage value of the control terminal of the signal generator 5013 is collected at the rising edge of each pulse signal output by the signal generator 5013, pulses with the same period and different duty ratios are generated at the output terminal according to the voltage value of the control terminal of the signal generator 5013, and the pulse period can be designed to be, for example, 100ns, when the value of the control end is 5V, the duty ratio is 0%, when the value of the control end is 4.9V, the duty ratio is 1%, and when the value of the control end is 0.1, the duty ratio is 49%; and so on.

When the voltage detection module 10 detects that the voltage value at the power end of the adjustment circuit rises, so that the voltage value is greater than or equal to the preset voltage threshold, specifically, when the voltage at the non-inverting end of the comparator 5009 is greater than or equal to the voltage value of the voltage source 5008 connected to the inverting end, the voltage detection module 10 outputs a control signal, i.e., a high level signal, to the control end of the first switch 5001 and the counting module 20 through the output end of the comparator 5009, so as to control the first switch 5001 to be turned on from off.

When the first switch 5001 is turned on, there are three states according to the timing of the counting module 20 at this time:

if the counter 5002 of the counting module 20 does not count to the preset first target time, for example, 1024us, at this time, the first and third output terminals of the counter 5002 output the low level state of the first trigger signal, and the pulse signal with the gradually increasing duty ratio output by the signal generator 5013 passes through the third switch 5014 and the fourth switch 5007 to make the second NMOS transistor 5004 in the on-off state, so that the output of the output module 30 at this time is in the low-resistance and high-resistance alternate continuous state, at this time, the accumulated charge on the IGBT transistor is further discharged continuously through the second NMOS transistor 5004, and the discharge is performed in the state where the on-duty ratio is longer and longer. Because the accumulated charge on the IGBT is naturally discharged before the counter 5002 starts counting, and after the voltage value of the power end of the regulating circuit rises, the charge on the IGBT may still be more after being naturally discharged, at this time, if the output module is controlled to discharge by using the pulse with a larger duty ratio, the accumulated charge on the IGBT is excessively heated and damaged when the second NMOS in the output module is turned on and discharged. And the duty cycle that adopts to switch on gradually crescent switching state can carry out the slow discharge with the electric charge that above-mentioned IGBT pipe stayed, and the short time in a cycle is opened the time that the accessible that generates heat of production is closed for a long time and is cooled off, reduces along with the discharge of residual charge, and is limited to the impact of intelligent power module, and during the duty cycle crescent to discharge with higher speed guarantees that discharge is abundant, can ignore to the impact of intelligent power module. Therefore, the safe discharge of the charge is ensured, and the discharge speed is also ensured.

If the counter 5002 of the counting module 20 reaches or exceeds the preset first target time 1024us and does not reach the second target time 2048us, the third output terminal of the counter 5002 outputs a high level of the second trigger signal, the fixed terminal of the third switch 5014 is controlled to be connected to the second selection terminal, at this time, the positive electrode of the power source terminal of the adjusting circuit 14A is loaded on the gate of the second NMOS transistor 5004 through the third switch 5014 and the fourth switch 5007, so that the second NMOS transistor 5004 is in a continuous conduction state, that is, the output of the output module is in a continuous low-resistance state, at this time, the accumulated charge on the IGBT transistor is further discharged continuously through the second NMOS transistor 5004, because the second NMOS transistor 5004 is completely conducted at this time, the discharging speed is faster than the above-mentioned discharging speed when the second NMOS transistor is in the switch state, and it is ensured that the charge can be discharged. When the counter 5002 counts 1024us, a part or most of accumulated electric charge on the IGBT is already discharged by adopting a switch state, so that the accumulated electric charge on the IGBT is discharged when the second NMOS tube 5004 is completely switched on, so that the second NMOS tube 5004 cannot be damaged due to large discharge current, and the discharge speed is increased on the premise of ensuring the working safety of the second NMOS tube 5004.

If the time counted by the counter 5002 of the counting module 20 has reached the second target time 2048us, at this time, the counter 5002 completes the time counted, and the first output terminal of the counter 5002 also outputs the high-level third trigger signal, so that the second switch 5011 is turned on, and further the control terminal of the fourth switch 5007 is also changed from being connected with the first selection terminal to being connected with the second selection terminal, and at this time, the driving signal output by the driving circuit is output to the corresponding IGBT through the output module 30 and the first switch 5001, that is, the signal input terminal IN of the adjusting circuit can be normally output to the output terminal OUT, that is, the IPM module 4100 recovers to the normal working state.

When the voltage value of the power end of the regulating circuit recovers after dropping, the time for further discharging the accumulated charge on the IGBT through the output module 30 depends on the length relationship between the time for the voltage value to drop to recover and the first and second target times for the counting module 20 to count. If the voltage value drops to the recovery time for a longer time and exceeds the second target time of the counting module 20, the accumulated charge on the IGBT during this period can be completely discharged after performing natural discharge, so that when the voltage rises to recover, the output module directly drives the driving signal output by the circuit to output to the corresponding IGBT through the first switch 5001, and further discharge through the low impedance state of the output module is not required. If the time of the voltage value falling to the recovery is short and is less than the second target time of the counting module 20, when the voltage rising is recovered, the accumulated charge on the IGBT may not be completely discharged naturally in the last step, and further discharge through the low-resistance state of the output module is required, during this period, if the accumulated charge is further less than the first target time 1024us within the second target time 2048us, the charge is discharged through the output module 30 in a state where low resistance and high resistance of the output module 30 are alternately and continuously, and the time of the low-resistance state is gradually increased, or if the accumulated charge is greater than the first target time, the accumulated charge is discharged directly through the low-resistance state of the output module 30, and if the counted time 2048us of the counting module 20 is greater than the first target time, the counted time of the counting module 20 is TM when the voltage rising is recovered. Its further bleeding time TT is calculated as follows:

TT＝2048-TM

the time TT ensures that the charge accumulated on the IGBT tube is further discharged completely after the last step of natural discharge.

The IPM module 4100 provided by the embodiment of the invention is additionally provided with an adjusting circuit between each driving circuit inside the IPM module 4100 and the corresponding IGBT tube, the adjusting circuit can detect the change of the power supply voltage value of the IPM module 4100 in real time, and when the voltage value is too low due to the fluctuation of the low-voltage power supply, the module stops outputting, so that the IGBT tube in the module accumulates charges due to the energy storage of the driving motor, the driving circuit can firstly cut off the driving signal of the driving output and the IGBT tube, so that the charges accumulated by the IGBT tube are firstly naturally discharged, the adjusting circuit starts timing, then when the low-voltage power supply recovers to be normal, if the voltage value is reduced to the recovery time and exceeds the second target time, the driving signal output by the driving circuit is directly controlled to the corresponding IGBT tube, and if the voltage value is reduced to the recovery time and is less than the second target time and more than the first target time, the low-resistance state is output within the remaining time from the timing to the target And (3) performing quick discharge, if the time for recovering the voltage value is reduced to be less than the first target time, discharging through the high-resistance and low-resistance alternating state output by the adjusting circuit in the first target time, wherein the time of the low-resistance state is gradually increased, so that the discharge of the adjusting circuit is safer, and when the time is timed to be longer than the first target time, outputting the low-resistance state for quick discharge. The safe and quick discharge of the accumulated charges in the IGBT is ensured, the recovery time of the IPM module 4100 in low-voltage power supply voltage fluctuation can be shortened, the module can quickly recover normal work, and the influence of the impact of the accumulated charges on the module on the working reliability of the module is avoided.

Further, based on the first embodiment of the intelligent power module of the present invention, in the second embodiment of the intelligent power module of the air conditioner of the present invention, as shown in fig. 4, each adjusting circuit further includes a shaping amplifying module, taking the UH output adjusting circuit 14A as an example, the UH output adjusting circuit 14A further includes a shaping amplifying module 40:

the input end of the shaping amplifying module 40 is connected to the input end of the adjusting circuit 14A, the output end of the shaping amplifying module 40 is connected to the input end of the output module 30, and the shaping amplifying module 40 amplifies and shapes the signal at the signal input end of the adjusting circuit and outputs the signal to the input end of the output module 30.

Specifically, the shaping amplifying module 40 includes a third not gate 5005 and a fourth not gate 5006;

the input of the third not gate 5005 is the input of the shaping amplifying module 40, the output of the third not gate 5005 is connected to the input of the fourth not gate 5006, and the output of the fourth not gate 5006 is the output of the shaping amplifying module 40.

IN the normal operation process of the IPM module 4100, an input signal at the signal input terminal IN of the adjustment circuit is amplified and shaped by the third not gate 5005 and the fourth not gate 5006, and is output after being power-driven by the first PMOS transistor 5003 and the second NMOS transistor 5004 of the output module 30.

Further, the MOS transistors forming the third not gate 5005 and the fourth not gate 5006 may have different sizes, and the MOS transistor size of the third not gate 5005 is smaller than that of the fourth not gate 5006, because the signal strength of the signal is increased after the signal is first amplified by the third not gate 5005, and the power of the device is increased when the signal is amplified by the fourth not gate 5006, so the design size of the MOS transistor therein may be larger than that of the third not gate 5005, for example, the MOS transistor size of the third not gate 5005 may be designed to be 1/2 of the MOS transistor size in the fourth not gate 5006.

Further, based on the first embodiment of the intelligent power module of the present invention, in the third embodiment of the intelligent power module of the air conditioner of the present invention, as shown in fig. 4, the output module 30 further includes a shaping unit 31;

the output terminal of the second switch 5011 is connected to the input terminal of the shaping unit 31, the output terminal of the shaping unit 31 is the control terminal of the fourth switch 5007, and the shaping unit 31 shapes the control signal output by the second switch 5011 and outputs the shaped control signal to the control terminal of the fourth switch 5007.

Specifically, the shaping unit 31 includes a first not gate 5010 and a second not gate 5008;

an input terminal of the first not gate 5010 is an input terminal of the shaping unit 21, an output terminal of the first not gate 5010 is connected to an input terminal of the second not gate 5008, and an output terminal of the second not gate 5008 is an output terminal of the shaping unit 21.

The first not gate 5010 and the second not gate 5008 provide a shaped control signal output from the second switch 5011 to the control terminal of the third switch 5007.

The present invention also provides an air conditioner including an air conditioner controller for implementing control of a relevant charge of the air conditioner, and more particularly, for the inverter air conditioner, the air conditioner controller can be divided into controllers of an indoor unit part and an outdoor unit part, the indoor machine controller realizes the drive of the load operation of the indoor machine fan motor, the air guide strip and the like, the outdoor machine controller realizes the drive of the load operation of the compressor, the outdoor fan motor, the four-way valve and the like, wherein the outdoor controller comprises the IPM module for driving the compressor, if the outdoor fan motor is a DC fan, the indoor controller comprises an indoor fan motor, an outdoor controller and an IPM module, wherein the IPM module is used for driving a direct current fan, and the indoor controller also comprises the IPM module used for driving the direct current fan if the indoor fan motor is the direct current fan. For specific implementation and effects of the IPM module, reference may be made to the above embodiments, which are not described herein again.

In the description herein, references to the description of the terms "first embodiment," "second embodiment," "example," etc., mean that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An intelligent power module is characterized by comprising a three-phase upper bridge arm IGBT tube, a three-phase lower bridge arm IGBT tube, a driving circuit and an adjusting circuit, wherein the driving circuit and the adjusting circuit correspond to each IGBT tube in the three-phase upper bridge arm IGBT tube and the three-phase lower bridge arm IGBT tube;

the adjusting circuit is used for detecting the voltage value of a power supply end of the adjusting circuit, when the voltage value is smaller than a preset voltage threshold value, the adjusting circuit cuts off a driving signal output by the driving circuit to the corresponding IGBT tube and starts timing, when the voltage value is larger than or equal to the preset voltage threshold value, if the timing time does not reach a first target time, the adjusting circuit outputs a low-resistance and high-resistance alternate continuous state to discharge the charge of the corresponding IGBT tube, and the duty ratio of the low-resistance state is continuously changed from small to large; if the timing time reaches the first target time and does not reach the second target time, the adjusting circuit outputs a low resistance state to continuously discharge the charges of the corresponding IGBT tube, and if the timing time reaches the second target time, the driving circuit is controlled to output a driving signal to the corresponding IGBT tube;

each adjusting circuit comprises a voltage detection module, a counting module, a signal generator, an output module and a first switch;

2. The smart power module of claim 1 wherein the counting module is further to,

when the counting module is used for timing, a second output end of the counting module outputs a control signal with gradually reduced voltage to a control end of the signal generator;

3. The smart power module of claim 1 wherein the counting module comprises a first not gate and a counter;

4. The smart power module of claim 1 wherein the voltage detection module comprises a comparator, a voltage source;

5. The smart power module of claim 1 wherein the output module comprises a second switch, a third switch, a fourth switch, a first PMOS transistor and a second NMOS transistor;

6. The smart power module of claim 5 wherein the output module further comprises a shaping unit;

the output end of the second switch is connected with the input end of the shaping unit, the output end of the shaping unit is the control end of the third switch, and the shaping unit shapes the control signal output by the second switch and outputs the control signal to the control end of the third switch.

7. The smart power module of claim 6 wherein the shaping unit comprises a first not gate and a second not gate;

8. The smart power module of claim 1 wherein each of said regulation circuits further comprises a shaping amplification module:

9. An air conditioner comprising an air conditioning controller, the air conditioning controller comprising the smart power module of any of claims 1-8.