CN107492878A

CN107492878A - SPM and controller of air conditioner

Info

Publication number: CN107492878A
Application number: CN201710816171.5A
Authority: CN
Inventors: 冯宇翔
Original assignee: Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2017-09-11
Filing date: 2017-09-11
Publication date: 2017-12-19
Anticipated expiration: 2037-09-11
Also published as: CN107492878B

Abstract

The invention provides a kind of SPM and controller of air conditioner, by increasing an adjustment circuit between each drive circuit internally and corresponding IGBT pipes, the adjustment circuit can detect the change of SPM low-pressure area voltage value in real time, and its low-voltage power supply fluctuation cause magnitude of voltage it is too low make module stop export so that cause the energy storage of motor cause inside modules IGBT pipes savings electric charge when, the electric charge that can be put aside to inside modules IGBT pipes is released, and cause when supply voltage recovers normal work, it can continue completely to release above-mentioned electric charge, to avoid impact of its electric charge on inside modules circuit from influenceing the reliability of its work.

Description

Intelligent power module and air conditioner controller

Technical Field

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

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 in the working process of the intelligent power module, the charge accumulated in an IGBT (insulated gate bipolar transistor) tube in the intelligent power module cannot be discharged in a short time due to the instability of a power supply, so that the effective driving of the intelligent power module on a motor is influenced, and the working reliability of the intelligent power module is influenced due to the impact on the intelligent power 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 positive electrode and the negative electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube of the three-phase upper bridge arm are respectively connected with the positive electrode and the negative electrode of the power supply of the high-voltage area of the corresponding phase; the positive electrode and the negative electrode of the power supply end of the adjusting circuit corresponding to each IGBT tube of the three-phase lower bridge arm are respectively connected with the positive electrode and the negative electrode of the low-voltage power supply of the intelligent power module; wherein,

the adjusting circuit is used for detecting the voltage value of a power supply end of the adjusting circuit, cutting off a driving signal output to the corresponding IGBT tube by the driving circuit when the voltage value is smaller than a preset threshold value, outputting a low-resistance and high-resistance alternate continuous state to discharge the charge of the corresponding IGBT tube when the voltage value is larger than or equal to the preset voltage threshold value, and controlling the driving circuit to output the driving signal to the corresponding IGBT tube after delaying for preset time.

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

the input end of the voltage detection module, the power end of the delay 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, and the output end of the voltage detection module is respectively connected with the control end of the delay module and the control end of the first switch; the output end of the delay module is connected with the second control end of the output module; the output end of the signal generator is connected with the first 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;

when the voltage detection module detects that the voltage value of the input end of the adjusting circuit is smaller than the preset voltage threshold, the first switch is controlled to be switched from on to off;

when the voltage detection module detects that the voltage value of the input end of the adjusting circuit is greater than or equal to the preset voltage threshold value, the voltage detection module controls the first switch to be switched on and the time delay module to start timing, and controls the output module to output a low-resistance and high-resistance alternately continuous state through the signal generator so as to discharge charges corresponding to the IGBT tube, and when the timing reaches the preset time, the time delay module controls the output module to output a driving signal to the corresponding IGBT tube through the output module.

In one possible design, the delay module includes a second switch, a first resistor, and a first capacitor;

the control end of the second switch is the control end of the delay module, the input end of the second switch is connected with the positive electrode of the power end of the adjusting circuit, the connecting end of the output end of the second switch and one end of the first resistor is the output end of the delay module, the other end of the first resistor is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the negative electrode of the adjusting circuit.

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

the output end of the second switch and the connection end of one end of the first resistor are input ends of the shaping unit, the output end of the shaping unit is the output end of the delay module, and the shaping unit shapes the control signal output by the delay module and outputs the control signal to the control end of the output module.

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

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 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 input by the signal input end of the adjusting circuit and outputs the signal to the input end of the output module.

In one possible design, the shaping amplification module includes a third not gate and a fourth not gate;

the input end of the third not gate is the input end of the shaping amplification module, the output end of the third not gate is connected with the input end of the fourth not gate, and the output end of the fourth not gate is the output end of the shaping amplification module.

In one possible design, the size of the MOS transistor in the third not gate is 1/2 times the size of the MOS transistor in the fourth not gate.

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

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 first control end of the output module, the second selection end of the third switch is connected with the grid electrode of the first PMOS tube, the fixed end of the third switch is connected with the grid electrode of the second NMOS tube, the source electrode of the first PMOS tube is connected with the positive electrode of the power end of the adjusting circuit, 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 order to achieve the above object, the present invention further provides an air conditioner controller, wherein the air conditioner 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 low-voltage area of the intelligent power module 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 and further the IGBT tube in the module stores charges due to the energy storage of the driving motor, the driving signals of the driving output and the IGBT tube can be firstly cut off, so that the charges stored in the IGBT tube are firstly naturally discharged, then when the low-voltage power supply is recovered to be normal, the adjusting circuit outputs a continuous low-resistance and high-resistance alternating state to further rapidly discharge the charges stored in the IGBT tube, and after the time delay preset time, the adjusting circuit recovers the transmission of normal signals from the input end to the output end, so that the driving signals output by the driving, at the moment, the charges accumulated on the IGBT tube are completely discharged, so that the normal operation of the module is ensured, and the influence of the impact of the accumulated charges on the module on the operational reliability is avoided.

Drawings

FIG. 1 is a schematic diagram of a prior art circuit configuration of an intelligent power module;

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

FIG. 3 is a schematic circuit diagram of an intelligent power module according to the present invention;

fig. 4 is a schematic diagram of a specific circuit structure 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 output end of each driving circuit is connected with the input end of each corresponding adjusting circuit, and the output end of each adjusting circuit is connected with the grid electrode of each corresponding IGBT;

the positive end and the negative end of a power supply of the adjusting circuit corresponding to each IGBT tube of the three-phase upper bridge arm are respectively connected with the positive end and the negative end of a power supply of a high-voltage area power supply of a corresponding phase;

the positive end and the negative end of a power supply of the adjusting circuit corresponding to each IGBT tube of the three-phase lower bridge arm are respectively connected with the positive end and the negative end of the power supply of the IPM module low-voltage area;

the adjusting circuit is used for detecting a power supply of the IPM module in a low-voltage area, discharging charges accumulated in an IGBT (insulated gate bipolar transistor) tube in the IPM module when the power supply voltage drops, and continuously and completely discharging the charges when the power supply voltage recovers to normal work so as to avoid the impact of the charges on an internal circuit of the IPM module to influence the working reliability of the IPM module.

Specifically, the adjusting circuit is used for detecting a voltage value of an input 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, the adjusting circuit discharges charges corresponding to the IGBT tube, and after the preset time is delayed, the driving circuit is controlled to output the 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 delay module, an output module, a first switch, a second switch, and a third 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 delay module 20, an output module 30, a signal generator 5013, and a first switch 5001.

The input end of the voltage detection module 10, the power end of the delay module 20, the power end of the signal generator 5013 and the power end of the output module 30 are interconnected to form the power end of the adjusting circuit, and the output end of the voltage detection module 10 is connected to the control end of the delay module 20 and the control end of the first switch 5001; the output end of the delay module 20 is connected to the second control end of the output module 30; the output end of the signal generator 5013 is connected to the first control end of the output module 30, the input end of the output module 30 is the signal input end IN of the adjusting circuit, 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 the signal output end OUT of the adjusting circuit;

when detecting that the voltage value at the input end of the adjusting circuit is smaller than the preset voltage threshold, the voltage detecting module 10 controls the first switch 5001 to be switched from on to off;

when detecting that the voltage value at the input end of the adjusting circuit is greater than or equal to the preset voltage threshold value, the voltage detection module 10 controls the first switch 5001 to be switched on and the delay module 20 to start timing, and controls the output module 30 to output a low-resistance and high-resistance alternately continuous state through the signal generator 5013 so as to discharge the charges of the corresponding IGBT tube, and when the timing reaches the preset time value, controls the driving circuit to output a driving signal to the corresponding IGBT tube through the output module 30.

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 with the positive electrode VB1 of the power supply end of the regulating circuit, the positive output terminal of the voltage source 5008 is connected with the inverted terminal of the comparator 5009, and the negative electrode of the voltage source 5008 is connected with the negative electrode VS1 of the power supply end of the regulating circuit. The voltage source 5008 provides a stable reference voltage for the inverting terminal of the comparator 5009, and the voltage source 5008 may be designed to be 6V or a value 1-2V lower than the under-voltage protection of the IPM module 4100.

The delay module 20 includes a second switch 5011, a first resistor 5012, and a first capacitor 5002;

the control terminal of the second switch 5011 is the control terminal of the delay module 20, the input terminal of the second switch 5011 is connected to the positive terminal VB1 of the power supply terminal of the adjustment circuit, the connection terminal between the output terminal of the second switch 5011 and one terminal of the first resistor 5012 is the output terminal of the delay module 20, the other terminal of the first resistor 5012 is connected to one terminal of the first capacitor 5002, and the other terminal of the first capacitor 5002 is connected to the negative terminal VS1 of the adjustment circuit.

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

the control end of the third switch 5007 is the second control end of the output module 30, the first selection end of the third switch 5007 is the first control end of the output module 30, the second selection end of the third switch 5007 is connected to the gate of the first PMOS transistor 5003, the fixed end of the third switch 5007 is connected to the gate of the second NMOS transistor 5004, the source of the first PMOS transistor 5003 is connected to the positive electrode VB1 of the power supply terminal of the regulation circuit, the connection end between the drain of the first PMOS transistor 5003 and the drain of the second NMOS transistor 5004 is the output end of the output module 30, and the source of the second NMOS transistor 5004 is connected to the negative electrode VS1 of the power supply terminal of the regulation circuit.

The signal generator 5013 may include an oscillation circuit therein, and generate a continuous switching signal, for example, the switching signal may be a pulse signal with a duty ratio of 50%, and the pulse width may be designed to be 100 ns;

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 at the input terminal of the adjustment circuit is smaller than the preset voltage threshold, specifically, when the voltage value at 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 5011 and the control terminal of the third switch 5001 through the output terminal of the comparator 5009, and controls the two switches to be turned off from on during normal operation.

When the third switch 5001 is turned off, the output terminal of the output module 30 is disconnected from the output terminal OUT of the regulating circuit, so as to cut off the driving signal output from the driving circuit to the corresponding IGBT, that is, the output terminal OUT of the regulating circuit is turned off, and at this time, the accumulated charge on the IGBT is naturally discharged.

When the first switch 5011 is turned off, the first capacitor 5012 in the delay module 5012 rapidly discharges and outputs the second control signal with low level to the control terminal of the second switch 5007 through the first resistor 5002, so that the fixed terminal of the second switch 5007 is connected to the first selection terminal, and the continuous switching signal generated by the signal generator 5013 is input to the second input terminal of the output module 30, i.e., the gate of the second NMOS transistor 5004;

when the voltage detection module 10 detects that the voltage value at the input terminal of the adjustment circuit is greater than or equal to the predetermined voltage threshold, specifically, when the voltage at the non-inverting terminal of the comparator 5009 is greater than or equal to the voltage value of the voltage source 5008 connected to the inverting terminal, the voltage detection module 10 outputs a third control signal, i.e., a high level signal, to the control terminal of the first switch 5011 and the control terminal of the third switch 5001 through the output terminal of the comparator 5009, so as to control the two switches to be turned on from off.

When the third switch 5001 is turned on, the continuous switching signal generated by the previous signal generator 5013 is applied to the gate of the second NMOS transistor 5004, so that the second NMOS transistor 5004 is in a continuous switching state, at this time, the output module 30 outputs a state in which the low resistance and the high resistance are alternately continuous, at this time, the accumulated charge on the IGBT transistor is further discharged continuously through the continuous switching state of the second NMOS transistor 5004, and the speed of charge discharge is faster than the previous natural discharge.

When the first switch 5011 is turned on, the power supply voltage VB1 of the adjusting circuit charges the first capacitor 5002 through the first resistor 5012 via the first switch 5011, and when the voltage on the first capacitor 5002 rises to a high level after a preset time, the fourth control signal is output to connect the fixed end of the second switch 5007 to the second selection end, and at this time, the driving circuit is controlled to output the driving signal to the corresponding IGBT, so that the input terminal IN of the adjusting circuit can be normally output to the output terminal OUT, that is, the IPM module 4100 recovers to a normal operating state, and since the discharging of the accumulated electric charge on the IGBT is already completed after the preset time, the IPM module 4100 can be ensured to recover to operate normally.

It should be noted that when the adjusting circuit detects that the voltage is too low due to the fluctuation of the low-voltage power supply, i.e., VDD, the third switch 5001 is first controlled to be turned off to naturally discharge the accumulated charge on the IGBT, instead of directly controlling the second NMOS 5004 to discharge the charge, because the accumulated charge on the IGBT is more, if the charge is directly discharged through the second NMOS 5004, the discharge current is too large, which causes the second NMOS 5004 to be too hot and even damaged, so the accumulated charge on the IGBT is naturally discharged through turning off the third switch 5001, after the low-voltage power supply returns to normal, the telephone stored in the IGBT is already discharged for a while, which may be completely discharged or not, and may be incomplete, specifically, the time is determined according to the time from the low-voltage power supply falling to the normal return, and then the signal generator 5013 controls the continuous switching state of the second NMOS 5004 to further discharge the charge, the reason why the signal generator 5013 controls the continuous on/off state of the second NMOS transistor 5004 is to prevent the charge from accumulating when the charge is discharged through the second NMOS transistor 5004, for example, when the second NMOS transistor 5004 is controlled to be on/off by a pulse with a duty ratio of 50%, after 50% of the time when the heat is discharged, the other 50% of the time is used for cooling, if the second NMOS transistor 5004 is directly controlled to be continuously turned on, the charge may be relatively large, so that the second NMOS transistor 5004 may be damaged due to excessive heat accumulation when the charge is discharged. The regulator circuit resumes normal operation after a predetermined time, which is advantageous for more safe and reliable operation of the IPM module 4100.

The values of the first resistor 5012 and the first capacitor 5002 corresponding to the delay module 20 may be selected as follows:

taking the high level to which the first capacitor 5002 is charged to 7.5V and the time parameter Tx to be designed to 1 μ s, then:

obtaining:

the capacitance of the first capacitor 5002 can be designed to be 10pF according to the above formula, and the resistance value of the first resistor 5012 is 144k Ω.

It should be noted that the UH output regulator circuit 14A and other output regulator circuits have the same operation principle, and that the supply voltage of the output regulator circuit 24A, WH of the UH output regulator circuit 14A, VH is a corresponding high-voltage supply power supply, and the supply voltage of the output regulator circuit 34A is variable with respect to the COM terminal of the low-voltage area, but the voltage of the positive terminal of the supply power is not changed with respect to the negative terminal of the IPM module 4100 during normal operation, and the UL output regulator circuit 44A, WL outputs the working power of the regulator circuit 54A, VL and the working power of the output regulator circuit 64A is a low-voltage supply power of the IPM module 4100, and the voltage value of the working power is close to the same as the voltage of the positive terminal of the high-voltage area supply power supply, and when the low-voltage supply power of the IPM module 4100, i.e. VDD fluctuates, the charging of the three bootstrap capacitors will fluctuate accordingly, so the voltage of the positive terminal of the high-voltage area supply power will fluctuate accordingly, the voltage value is also nearly the same as the voltage value of the low-voltage region.

The IPM module 4100 of the embodiment of the invention adds an adjusting circuit between each driving circuit inside 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 to stop the module output and further the energy storage of the driving motor causes the IGBT tube in the module to accumulate charges, the adjusting circuit can firstly cut off the driving signals of the driving output and the IGBT tube, so that the charges accumulated by the IGBT tube are firstly naturally discharged, then when the low voltage power supply is recovered to be normal, the adjusting circuit outputs the continuous low-resistance and high-resistance alternate state to further rapidly discharge the charges accumulated by the IGBT tube, and after the preset time is delayed, the adjusting circuit recovers the transmission of the normal signals from the input end to the output end, so that the driving signals output by the driving circuit can normally control the corresponding IGBT tube, at the moment, the charges accumulated on the IGBT tube are completely discharged, so that the normal operation of the module is ensured, and the influence of the impact of the accumulated charges on the module on the operational reliability 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, the output end of the shaping amplifying module 40 is connected to the second selection end of the second switch 5007, and the shaping amplifying module 40 amplifies and shapes the signal at the input end of the adjusting circuit and outputs the signal to the second selection end of the second switch 5007.

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 input terminal IN of the adjustment circuit is amplified and shaped by the third not gate 5005 and the fourth not gate 5006, and then 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 a third embodiment of the intelligent power module of the air conditioner of the present invention, as shown in fig. 4, the delay module 20 further includes a shaping unit 21;

the input end and the output end of the shaping unit 21 are respectively connected to one end of the first resistor 5012 and the output end of the delay module 20, and the shaping unit 21 shapes the control signal output by the delay module 20 and outputs the control signal to the control end of the second switch 5007.

Specifically, the shaping unit 21 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 control terminal for shaping the voltage on the first capacitor 5002 of the delay module 20 and then outputting the shaped voltage to the second switch 5007, and meanwhile, since the conversion of the output signal of the not gate has a requirement on the threshold of the input signal, the voltage input on the first capacitor 5002 also has a threshold requirement, only when the threshold is reached, the output of the not gate is converted, and the output of the not gate is ensured to be consistent with the input signal of the first not gate after the shaping of the next not gate. For example, the input threshold Vth of the first not gate 5010 can be designed to be 7.5V, which can affect the design parameters of the first capacitor 5002 and the first resistor 5012.

The invention also provides an air conditioner controller, which is used for realizing the control of the air conditioner in relative charge, in particular to a variable frequency air conditioner, the air conditioner controller can be divided into controllers of an indoor unit part and an outdoor unit part, the indoor unit controller realizes the driving of the running of loads such as an indoor unit fan motor, an air guide strip and the like, the outdoor unit controller realizes the driving of the running of loads such as a compressor, an outdoor fan motor, a four-way valve and the like, wherein the outdoor controller comprises the IPM module for driving the running of the compressor, if the outdoor fan motor is a direct current fan, the interior of the outdoor controller also comprises the IPM module for driving the direct current fan, and if the indoor fan motor is a direct current fan, the interior of the indoor controller also comprises the IPM module for driving 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 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 adjusting circuit is used for detecting the voltage value of a power supply end of the adjusting circuit, cutting off a driving signal output to a corresponding IGBT tube by the driving circuit when the voltage value is smaller than a preset voltage threshold value, outputting a low-resistance and high-resistance alternate continuous state to discharge electric charges of the corresponding IGBT tube when the voltage value is larger than or equal to the preset voltage threshold value, and controlling the driving circuit to output the driving signal to the corresponding IGBT tube after delaying for preset time.

2. The smart power module of claim 1 wherein each of the regulation circuits comprises a voltage detection module, a delay module, an output module, a signal generator, a first switch;

3. The smart power module of claim 2 wherein the delay module comprises a second switch, a first resistor, and a first capacitor;

4. The smart power module of claim 3 wherein the delay module further comprises a shaping unit;

5. The smart power module of claim 4 wherein the shaping unit comprises a first not gate and a second not gate;

6. The smart power module of claim 2 wherein the voltage detection module comprises a comparator, a voltage source;

7. The smart power module of claim 2 wherein each of said regulation circuits further comprises a shaping amplification module:

8. The smart power module of claim 7 wherein the shaping amplification module comprises a third not gate and a fourth not gate;

9. The smart power module of claim 8 wherein the MOS transistor size in the third not gate is 1/2 times the MOS transistor size in the fourth not gate.

10. The smart power module of claim 2 wherein the output module comprises a third switch, a first PMOS transistor and a second NMOS transistor;

11. An air conditioner controller comprising the smart power module of any one of claims 1 to 10.