CN217956685U - Air condition compressor IGBT overcurrent protection drive circuit - Google Patents
Air condition compressor IGBT overcurrent protection drive circuit Download PDFInfo
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- CN217956685U CN217956685U CN202222082363.7U CN202222082363U CN217956685U CN 217956685 U CN217956685 U CN 217956685U CN 202222082363 U CN202222082363 U CN 202222082363U CN 217956685 U CN217956685 U CN 217956685U
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Abstract
The utility model relates to an air condition compressor drive circuit technical field. The provided IGBT overcurrent protection driving circuit of the air conditioner compressor comprises a three-phase bridge type inverter circuit, a first voltage detection circuit, a second voltage detection circuit, a third voltage detection circuit and a main control circuit. The utility model provides an air condition compressor IGBT overcurrent protection drive circuit, whether the IGBT overflows can be judged through detecting the magnitude of the breakover voltage drop of the IGBT in real time so as to prevent the IGBT from overcurrent damage; the current limiting action is carried out according to the change characteristics of current and voltage when the IGBT is switched on, and the IGBT is switched off according to a hardware circuit, so that the IGBT switching-off device has the advantages of quick, accurate and reliable action; because the on-state voltage drop of the IGBT generally changes within 0.7-5V and is relatively low, the dv/dt of the on-state voltage is small even if the current flowing through the IGBT changes greatly, and therefore the circuit is not easy to be interfered.
Description
Technical Field
The utility model relates to an air condition compressor drive circuit technical field, concretely relates to air condition compressor IGBT overcurrent protection drive circuit.
Background
At present, a motor of an air conditioner compressor is a three-phase permanent magnet synchronous motor, three windings of the three-phase permanent magnet synchronous motor are respectively U, V and W, and at present, an IGBT three-phase bridge type inverter circuit is mainly used for converting direct current into alternating current to drive the three-phase motor to rotate.
The IGBT is a main component of a three-phase bridge inverter circuit in a motor control module of a compressor, is called an Insulated Gate Bipolar Transistor (IGBT) in the whole name, is called an Insulated Gate Bipolar Transistor in the Chinese name, and is a composite full-control voltage-driven power semiconductor device consisting of a Bipolar Junction Transistor (BJT) and a Metal Oxide Semiconductor (MOS).
Like other transistors, the operating current of the IGBT is limited, which may cause the IGBT to break down when the current flowing through the IGBT is too large. The current detection method of the current sampling sensor and the related circuit is generally used for carrying out overcurrent protection on the IGBT, and when the current sampling sensor or the related circuit is damaged, the IGBT loses the function of overcurrent protection, so that the IGBT is easily damaged due to overcurrent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an air condition compressor IGBT overcurrent protection drive circuit.
The utility model adopts the following technical scheme:
the air conditioner compressor IGBT overcurrent protection driving circuit comprises a three-phase bridge inverter circuit, a first voltage detection circuit, a second voltage detection circuit, a third voltage detection circuit and a main control circuit;
the three-phase bridge inverter circuit comprises IGBT1, IGBT2, IGBT3, IGBT4, IGBT5 and IGBT6, the gate pole of which is respectively connected with the PWM1 driving signal end, the PWM2 driving signal end, the PWM3 driving signal end, the PWM4 driving signal end, the PWM5 driving signal end and the PWM6 driving signal end of the main control circuit,
the collectors of the IGBT4, the IGBT5 and the IGBT6 are connected with the positive electrode HV +, the emitters of the IGBT1, the IGBT2 and the IGBT3 are connected with the negative electrode HV-,
the collector of the IGBT1 is connected with the emitter of the IGBT4, the collector of the IGBT2 is connected with the emitter of the IGBT5, the collector of the IGBT3 is connected with the emitter of the IGBT6,
an emitting electrode of the IGBT4 is connected with a U winding of the three-phase permanent magnet synchronous motor, an emitting electrode of the IGBT5 is connected with a V winding of the three-phase permanent magnet synchronous motor, and an emitting electrode of the IGBT6 is connected with a W winding of the three-phase permanent magnet synchronous motor;
the first voltage detection circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RL1, a capacitor C1, a diode D11, a diode D12 and an operational amplifier U1;
the non-inverting input end of the operational amplifier U1 is grounded through the resistor R12, sequentially connected with the cathode of the diode D11 through the resistor R13 and the resistor R11, sequentially connected with the anode of the diode D12 through the resistor R13 and the resistor RL1, sequentially connected with the cathode HV < - > of the power supply through the resistor R13 and the capacitor C1,
the anode of the diode D11 is connected with the PWM1 driving signal end of the main control circuit,
the cathode of the diode D12 is connected to the collector of the IGBT1,
the inverting input end of the operational amplifier U1 is connected with the negative electrode HV < - > of the power supply through the resistor R14,
the output end of the operational amplifier U1 is connected with the inverting input end thereof through the resistor R15,
the output end of the operational amplifier U1 is connected with a U-phase voltage detection end U _ vce of the main control circuit;
the second voltage detection circuit comprises a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor RL2, a capacitor C2, a diode D21, a diode D22 and an operational amplifier U2;
the non-inverting input end of the operational amplifier U2 is grounded through the resistor R22, sequentially connected with the resistor R23 and the resistor R21 and the cathode of the diode D21, sequentially connected with the resistor R23 and the resistor RL2 and the anode of the diode D22, sequentially connected with the resistor R23 and the capacitor C2 and the power supply cathode HV-,
the anode of the diode D21 is connected with the PWM2 driving signal end of the main control circuit,
the cathode of the diode D22 is connected to the collector of the IGBT2,
the inverting input end of the operational amplifier U2 is connected with the negative electrode HV < - > of the power supply through the resistor R24,
the output end of the operational amplifier U2 is connected with the inverting input end thereof through the resistor R25,
the output end of the operational amplifier U2 is connected with a V-phase voltage detection end V _ vce of the main control circuit;
the third voltage detection circuit comprises a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor RL3, a capacitor C3, a diode D31, a diode D32 and an operational amplifier U3;
the non-inverting input end of the operational amplifier U3 is grounded through the resistor R32, sequentially connected with the cathode of the diode D31 through the resistor R33 and the resistor R31, sequentially connected with the anode of the diode D32 through the resistor R33 and the resistor RL3, sequentially connected with the cathode HV < - > of the power supply through the resistor R33 and the capacitor C3,
the anode of the diode D31 is connected to the PWM3 driving signal terminal of the main control circuit,
the cathode of the diode D32 is connected to the collector of the IGBT3,
the inverting input end of the operational amplifier U3 is connected with the negative electrode HV < - > of the power supply through the resistor R34,
the output end of the operational amplifier U3 is connected with the inverting input end thereof through the resistor R15,
the output end of the operational amplifier U3 is connected with the W phase voltage detection end W _ vce of the main control circuit.
The utility model provides an air condition compressor IGBT overcurrent protection drive circuit, whether the IGBT overflows can be judged through detecting the magnitude of the breakover voltage drop of the IGBT in real time so as to prevent the IGBT from overcurrent damage; the current limiting action is carried out according to the change characteristics of current and voltage when the IGBT is switched on, and the IGBT is switched off according to a hardware circuit, so that the IGBT switching-on and switching-off device has the advantages of quick, accurate and reliable action; because the on-state voltage drop of the IGBT generally changes within 0.7-5V and is relatively low, the dv/dt of the on-state voltage is small even if the current flowing through the IGBT changes greatly, and therefore the circuit is not easy to be interfered.
Drawings
Fig. 1 is the embodiment of the utility model provides an air condition compressor IGBT overcurrent protection drive circuit's circuit schematic diagram.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Refer to fig. 1.
The air conditioner compressor IGBT overcurrent protection driving circuit provided by the embodiment comprises a three-phase bridge type inverter circuit, a first voltage detection circuit, a second voltage detection circuit, a third voltage detection circuit and a main control circuit;
the three-phase bridge inverter circuit comprises IGBT1, IGBT2, IGBT3, IGBT4, IGBT5 and IGBT6, the gate pole of which is respectively connected with the PWM1 driving signal end, the PWM2 driving signal end, the PWM3 driving signal end, the PWM4 driving signal end, the PWM5 driving signal end and the PWM6 driving signal end of the main control circuit,
the collectors of IGBT4, IGBT5, IGBT6 are connected with the positive electrode HV +, the emitters of IGBT1, IGBT2, IGBT3 are connected with the negative electrode HV-,
the collector of IGBT1 is connected with the emitter of IGBT4, the collector of IGBT2 is connected with the emitter of IGBT5, the collector of IGBT3 is connected with the emitter of IGBT6,
an emitter of the IGBT4 is connected with a U winding of the three-phase permanent magnet synchronous motor, an emitter of the IGBT5 is connected with a V winding of the three-phase permanent magnet synchronous motor, and an emitter of the IGBT6 is connected with a W winding of the three-phase permanent magnet synchronous motor;
the first voltage detection circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RL1, a capacitor C1, a diode D11, a diode D12 and an operational amplifier U1;
the non-inverting input end of the operational amplifier U1 is grounded through a resistor R12, is connected with the cathode of a diode D11 through a resistor R13 and a resistor R11 in sequence, is connected with the anode of the diode D12 through a resistor R13 and a resistor RL1 in sequence, and is connected with the cathode HV-of the power supply through a resistor R13 and a capacitor C1 in sequence,
the anode of the diode D11 is connected with the PWM1 driving signal end of the main control circuit,
the cathode of the diode D12 is connected to the collector of the IGBT1,
the inverting input end of the operational amplifier U1 is connected with the negative pole HV < - > of the power supply through a resistor R14,
the output terminal of the operational amplifier U1 is connected to its inverting input terminal through a resistor R15,
the output end of the operational amplifier U1 is connected with a U-phase voltage detection end U _ vce of the main control circuit;
the second voltage detection circuit comprises a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor RL2, a capacitor C2, a diode D21, a diode D22 and an operational amplifier U2;
the non-inverting input end of the operational amplifier U2 is grounded through a resistor R22, connected with the cathode of a diode D21 through a resistor R23 and a resistor R21 in sequence, connected with the anode of the diode D22 through a resistor R23 and a resistor RL2 in sequence, connected with the cathode HV < - > of the power supply through a resistor R23 and a capacitor C2 in sequence,
the anode of the diode D21 is connected with the PWM2 driving signal end of the main control circuit,
the cathode of the diode D22 is connected to the collector of the IGBT2,
the reverse input end of the operational amplifier U2 is connected with the negative pole HV-of the power supply through a resistor R24,
the output terminal of the operational amplifier U2 is connected to its inverting input terminal through a resistor R25,
the output end of the operational amplifier U2 is connected with a V-phase voltage detection end V _ vce of the main control circuit;
the third voltage detection circuit comprises a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor RL3, a capacitor C3, a diode D31, a diode D32 and an operational amplifier U3;
the non-inverting input end of the operational amplifier U3 is grounded through a resistor R32, connected with the cathode of a diode D31 through a resistor R33 and a resistor R31 in sequence, connected with the anode of the diode D32 through a resistor R33 and a resistor RL3 in sequence, connected with the cathode HV < - > of the power supply through a resistor R33 and a capacitor C3 in sequence,
the anode of the diode D31 is connected to the PWM3 driving signal terminal of the main control circuit,
the cathode of the diode D32 is connected to the collector of the IGBT3,
the inverting input end of the operational amplifier U3 is connected with the negative pole HV-of the power supply through a resistor R34,
the output terminal of the operational amplifier U3 is connected to its inverting input terminal through a resistor R15,
the output end of the operational amplifier U3 is connected with a W phase voltage detection end W _ vce of the main control circuit.
The working principle of the air conditioner compressor IGBT overcurrent protection driving circuit provided in this embodiment is further described as follows:
the IGBT is driven by the PWM driving signal, and is switched on when the PWM driving signal is high, and is switched off otherwise. The turn-on voltage drop of the IGBT increases with the increase in current, and exhibits a linear change in a certain region. Therefore, the present embodiment determines whether the IGBT is overcurrent by detecting the magnitude of the turn-on voltage drop of the IGBT.
In this embodiment, the operation principle of the first voltage detection circuit, the second voltage detection circuit, and the third voltage detection circuit is the same, and only the operation principle of the first voltage detection circuit will be described in detail below.
The diode D11 enables the PWM1 signal to flow in a single direction, the resistor R11 plays a role in current limiting and time delaying, the capacitor C1 plays a role in filtering, the diode D12 isolates the high-voltage signal, the resistor R11 and the capacitor C1 also form a filter circuit, and the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the operational amplifier U1 jointly form a proportional amplification circuit.
When the PWM1 driving signal end outputs high level, the gate pole of the IGBT1 is at high level, and the IGBT1 is conducted;
meanwhile, the high level output by the PWM1 driving signal end also charges a capacitor C11 through a diode D11 and a resistor R11; after the capacitor C11 is charged, the voltage thereof is the sum of the conduction voltage drop Vce of the IGBT1, the conduction voltage drop of the diode D12, and the voltage drop of the resistor RL 1;
the voltage of the capacitor C1 is divided by the resistor R13 and the resistor R12, then input to the operational amplifier U1, amplified by the operational amplifier U1, and then output to the main control circuit,
the voltage of the capacitor C1 is input to the non-inverting input end of the proportional amplifying circuit.
When the IGBT1 is in overcurrent, the conduction voltage drop Vce of the IGBT1 is too high, the voltage of the capacitor C1 is also too high at the moment, the too high voltage signal is amplified by the proportional amplification circuit and then transmitted to the main control circuit, the main control circuit closes the output of the PWM1 driving signal end, the PWM2 driving signal end, the PWM3 driving signal end, the PWM4 driving signal end, the PWM5 driving signal end and the PWM6 driving signal end after detecting the too high voltage signal, and at the moment, the IGBT1, the IGBT2, the IGBT3, the IGBT4, the IGBT5 and the IGBT6 are turned off, so that the overcurrent protection of the IGBT is realized
When the PWM1 outputs a low level signal, the IGBT1 is switched off, the voltage of the capacitor C1 is low, the main control circuit detects that the voltage signal output by the proportional amplification circuit is a normal value, and the PWM1 driving signal end, the PWM2 driving signal end, the PWM3 driving signal end, the PWM4 driving signal end, the PWM5 driving signal end and the PWM6 driving signal end of the main control circuit normally output signals.
In this embodiment, the resistor R13 has the same resistance as the resistor R14, and the resistor R12 has the same resistance as the resistor R15.
In this embodiment, the main control circuit is composed of a DSP chip and its peripheral circuits.
In the embodiment, the types of the IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, and IGBT are IKW40N60T, IKW25N60H3, or RGS80TSX2DHR;
the models of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3 are TL084 or LM324.
The model of the DSP chip is TMS320F280023 or TMS320F28031.
In this embodiment, diodes are connected in the forward direction between the emitters and collectors of IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, and IGBT 6.
In this embodiment, the air conditioner compressor IGBT overcurrent protection driving circuit further includes an IGBT characteristic detection circuit;
the IGBT characteristic detection circuit comprises a resistor R41 and a resistor R42,
the first end of the resistor R41 is connected with a Vcc power supply, the second end is connected with the ground through a resistor R42,
and a second end of the resistor R41 is connected with an IGBT characteristic detection end IGBT _ ID of the master control circuit.
By providing the IGBT characteristic detection circuit,
when the air conditioner compressor driving circuit is designed and manufactured, after the model number of the IGBT is changed,
the value of R41\ R42 can be adjusted so as to change the voltage value of the IGBT characteristic detection end IGBT _ ID, so that the main control circuit can judge the characteristic parameters and the model of the IGBT in the air conditioner compressor driving circuit by detecting the voltage value of the IGBT characteristic detection end IGBT _ ID, and the conduction voltage drop Vce value corresponding to the overcurrent of the IGBT is determined. Therefore, various IGBT models and corresponding conduction voltage drop Vce values during overcurrent can be preset in the driving program of the air conditioner compressor driving circuit, and one set of driving program can be compatible with various driving circuits using different models of IGBTs. Thereby facilitating the design and manufacture of the driving circuit of the air conditioner compressor.
In conclusion, the air conditioner compressor IGBT overcurrent protection driving circuit provided by the embodiment can judge whether the IGBT is in overcurrent or not by detecting the magnitude of the conduction voltage drop of the IGBT in real time so as to prevent the IGBT from overcurrent damage; the current limiting action is carried out according to the change characteristics of current and voltage when the IGBT is switched on, and the IGBT is switched off according to a hardware circuit, so that the IGBT switching-off device has the advantages of quick, accurate and reliable action; because the on-state voltage drop of the IGBT generally changes within 0.7-5V and is relatively low, the dv/dt of the on-state voltage is small even if the current flowing through the IGBT changes greatly, and therefore the circuit is not easy to be interfered.
The above is an illustration of the present invention.
Claims (2)
1. The air conditioner compressor IGBT overcurrent protection driving circuit is characterized by comprising a three-phase bridge type inverter circuit, a first voltage detection circuit, a second voltage detection circuit, a third voltage detection circuit and a main control circuit;
the three-phase bridge inverter circuit comprises IGBT1, IGBT2, IGBT3, IGBT4, IGBT5 and IGBT6, the gate pole of which is respectively connected with the PWM1 driving signal end, the PWM2 driving signal end, the PWM3 driving signal end, the PWM4 driving signal end, the PWM5 driving signal end and the PWM6 driving signal end of the main control circuit,
the collectors of the IGBT4, the IGBT5 and the IGBT6 are connected with the positive electrode HV +, the emitters of the IGBT1, the IGBT2 and the IGBT3 are connected with the negative electrode HV-,
the collector of the IGBT1 is connected with the emitter of the IGBT4, the collector of the IGBT2 is connected with the emitter of the IGBT5, the collector of the IGBT3 is connected with the emitter of the IGBT6,
an emitting electrode of the IGBT4 is connected with a U winding of the three-phase permanent magnet synchronous motor, an emitting electrode of the IGBT5 is connected with a V winding of the three-phase permanent magnet synchronous motor, and an emitting electrode of the IGBT6 is connected with a W winding of the three-phase permanent magnet synchronous motor;
the first voltage detection circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RL1, a capacitor C1, a diode D11, a diode D12 and an operational amplifier U1;
the non-inverting input end of the operational amplifier U1 is grounded through the resistor R12, sequentially connected with the cathode of the diode D11 through the resistor R13 and the resistor R11, sequentially connected with the anode of the diode D12 through the resistor R13 and the resistor RL1, sequentially connected with the cathode HV < - > of the power supply through the resistor R13 and the capacitor C1,
the anode of the diode D11 is connected with the PWM1 driving signal end of the main control circuit,
the cathode of the diode D12 is connected to the collector of the IGBT1,
the inverting input end of the operational amplifier U1 is connected with the negative electrode HV < - > of the power supply through the resistor R14,
the output end of the operational amplifier U1 is connected with the inverting input end thereof through the resistor R15,
the output end of the operational amplifier U1 is connected with a U-phase voltage detection end U _ vce of the main control circuit;
the second voltage detection circuit comprises a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor RL2, a capacitor C2, a diode D21, a diode D22 and an operational amplifier U2;
the non-inverting input end of the operational amplifier U2 is grounded through the resistor R22, sequentially connected with the resistor R23 and the resistor R21 and the cathode of the diode D21, sequentially connected with the resistor R23 and the resistor RL2 and the anode of the diode D22, sequentially connected with the resistor R23 and the capacitor C2 and the power supply cathode HV-,
the anode of the diode D21 is connected with the PWM2 driving signal end of the main control circuit,
the cathode of the diode D22 is connected to the collector of the IGBT2,
the inverting input end of the operational amplifier U2 is connected with the negative electrode HV < - > of the power supply through the resistor R24,
the output end of the operational amplifier U2 is connected with the inverting input end thereof through the resistor R25,
the output end of the operational amplifier U2 is connected with a V-phase voltage detection end V _ vce of the main control circuit;
the third voltage detection circuit comprises a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor RL3, a capacitor C3, a diode D31, a diode D32 and an operational amplifier U3;
the non-inverting input end of the operational amplifier U3 is grounded through the resistor R32, sequentially connected with the cathode of the diode D31 through the resistor R33 and the resistor R31, sequentially connected with the anode of the diode D32 through the resistor R33 and the resistor RL3, sequentially connected with the cathode HV < - > of the power supply through the resistor R33 and the capacitor C3,
the anode of the diode D31 is connected to the PWM3 driving signal terminal of the main control circuit,
the cathode of the diode D32 is connected to the collector of the IGBT3,
the inverting input end of the operational amplifier U3 is connected with the negative electrode HV < - > of the power supply through the resistor R34,
the output end of the operational amplifier U3 is connected with the inverting input end thereof through the resistor R15,
and the output end of the operational amplifier U3 is connected with a W-phase voltage detection end W _ vce of the main control circuit.
2. The air conditioner compressor IGBT overcurrent protection drive circuit of claim 1, further comprising an IGBT characteristic detection circuit;
the IGBT characteristic detection circuit comprises a resistor R41 and a resistor R42,
the first end of the resistor R41 is connected with a Vcc power supply, the second end is connected with the ground through the resistor R42,
and the second end of the resistor R41 is connected with an IGBT characteristic detection end IGBT _ ID of the main control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222082363.7U CN217956685U (en) | 2022-08-04 | 2022-08-04 | Air condition compressor IGBT overcurrent protection drive circuit |
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| CN202222082363.7U CN217956685U (en) | 2022-08-04 | 2022-08-04 | Air condition compressor IGBT overcurrent protection drive circuit |
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| CN217956685U true CN217956685U (en) | 2022-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116066344A (en) * | 2023-03-30 | 2023-05-05 | 深圳艾为电气技术有限公司 | IGBT-based electric compressor control method and device |
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- 2022-08-04 CN CN202222082363.7U patent/CN217956685U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116066344A (en) * | 2023-03-30 | 2023-05-05 | 深圳艾为电气技术有限公司 | IGBT-based electric compressor control method and device |
| CN116066344B (en) * | 2023-03-30 | 2023-07-21 | 深圳艾为电气技术有限公司 | IGBT-based electric compressor control method and device |
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Address after: 518000, 601, 6th Floor, Tianyun Building, Chongzhi Avenue, Vanke City Community, Bantian Street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Aiwei Electrical Technology Co.,Ltd. Country or region after: China Address before: 518000 7f703a, Shenzhou computer building, Madame Curie Avenue, wankecheng community, Bantian street, Longgang District, Shenzhen, Guangdong Province Patentee before: Shenzhen Aiwei Electrical Technology Co.,Ltd. Country or region before: China |
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