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Three-phase motor drive protection circuit

A technology for driving protection circuits and three-phase motors, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high cost of FPGA chips, increased control difficulty, and need for programming intervention, achieving low cost, simple and fast control process, Avoid the effect of frequent restarts

Pending Publication Date: 2019-05-28
SHANGHAI COTECH AUTOMOTIVE ENG CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of FPGA chips is high, and programming intervention is required for control, which increases the difficulty of control
Moreover, at present, semiconductor manufacturers have not launched FPGA chips that meet functional safety.

Method used

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  • Three-phase motor drive protection circuit
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  • Three-phase motor drive protection circuit

Examples

Experimental program
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Effect test

Embodiment

[0054] Such as figure 2 As shown, in this embodiment, the U-phase current sensor of the motor outputs V Iu Connect to port 2 and port 3 of the first 2-channel comparator U1, respectively. U phase current positive overcurrent protection threshold V Iu_TH+ It is connected to the first port of U1, which is generated by voltage division of VCC through the first resistor R1 and the second resistor R2, wherein VCC is connected to R1, and R1 is connected to ground through R2. U phase current negative overcurrent protection threshold V Iu_TH- It is connected to the fourth port of U1, which is generated by voltage division of VCC through the third resistor R3 and the fourth resistor R4, wherein VCC is connected to R3, and R3 is connected to ground through R4. The seventh port of U1 is connected to VCC, and connected to ground through the first capacitor C1. The fifth port and the sixth port of U1 are respectively connected to the first port and the second port of the second 4-inpu...

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Abstract

The invention relates to a three-phase motor drive protection circuit, which comprises a driving chip enabling control unit, a logic processing unit, and a U-phase, V-phase and W-phase over-current monitoring unit, a bus over-current monitoring unit, a bus under-voltage over-voltage monitoring unit, a U-phase and V-phase over-temperature monitoring unit and a W-phase and motor stator over-temperature monitoring unit, which are connected with the logic processing unit. The driving chip enabling control unit is connected with the logic processing unit, and comprises a microprocessor, a driving chip and a D trigger; the input end of the D trigger is connected with the output end of the logic processing unit; the output end of the D trigger is connected with the enabling end of the driving chip; the microprocessor is connected with a control port of the driving chip; and an IO port of the microprocessor is connected with one input end of the logic processing unit. Compared with the prior art, when the three-phase motor driving system has faults of overvoltage, undervoltage, overcurrent, over-temperature and the like and the microcontroller is reset, the motor stops rotating; and the three-phase motor drive protection circuit has a simple control process, and low cost.

Description

technical field [0001] The invention relates to the technical field of new energy drive, in particular to a three-phase motor drive protection circuit. Background technique [0002] The electric motor is the main actuator in the car and its function is to convert electrical energy into mechanical energy. Realize the long-distance transmission of energy, and at the same time, through appropriate wiring, the difficulty of automotive wiring and the complexity of mechanical mechanisms are greatly reduced. In the automotive field, three-phase permanent magnet synchronous motors are often used in steering systems and power drive systems of new energy vehicles; three-phase brushless DC motors are often used in water pumps, fans, sunroofs, intake and exhaust systems, etc. [0003] A three-phase motor drive system is generally composed of a power supply, a microcontroller, a (pre) drive chip, and a power drive device. According to the actual application of the motor, the motor type...

Claims

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Application Information

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IPC IPC(8): H02H7/08
Inventor 徐宏亮徐福祥
Owner SHANGHAI COTECH AUTOMOTIVE ENG CORP LTD
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