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IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver

A technology for stepping motors and protection circuits, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of low IGBT judgment accuracy, short circuit overcurrent fault tolerance time, and short service life of IGBT, so as to reduce the number of protection times, The effect of improving life and stability and improving work efficiency

Inactive Publication Date: 2015-11-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problems of low judgment accuracy for IGBT protection in existing motor drivers, short circuit overcurrent fault tolerance time, short service life of IGBT and poor reliability, etc.

Method used

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  • IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver
  • IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver
  • IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver

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specific Embodiment approach 1

[0020] Specific implementation scheme 1, this scheme is specifically designed to protect the first type of overcurrent. like Figure 1 As shown, this scheme mainly includes control circuit 1, overcurrent protection circuit 2, current transformer 3, first gate driver 4, second gate driver 5, IGBTT1~T4, gate resistors R1~R4, gate stabilizer Diodes D1-D4 and transistors Q1-Q4. Among them, the control circuit 1 is connected to the first gate drive, the second gate drive and the bases of the transistors Q1~Q4, and the first gate drive and the second gate drive pass through the gate resistors R1~R4 and the gates of the IGBTT1~T4 The collectors of transistors Q1~Q4 are connected to the cathodes of Zener diodes D1~D4, the anodes of Zener diodes D1~D4 are connected to the grids of IGBTT1~T4, and the IGBTT1~T4 and stepping motor coils form an H-type PWM power conversion circuit. The current transformer 3 is connected in series in the motor coil, the output terminal of the current tran...

specific Embodiment approach 2

[0031] Specific embodiment 2. This embodiment is a specific example of protecting the second type of overcurrent: when the stepper motor is working, because the coil is an inductive element, it will store a certain amount of feedback energy. When the stepper motor brakes or When reversing, the feedback energy can be calculated as follows:

[0032] E r e v = - 104.7 J G e s n N K T ( K E n N 2 + I 2 ...

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Abstract

The invention discloses an IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in a stepping motor driver, relates to the technical field of motors, and aims to solve the technical problems of low judgment accuracy, short circuit overcurrent fault tolerance time, short IGBT service life and poor reliability in the protection of IGBTs in an existing motor driver. The IGBT protection circuit comprises a control circuit, an overcurrent protection circuit, a current transformer, a grid driver 4, a grid driver 5, IGBTs, grid resistors, grid voltage stabilizing diodes and triodes, wherein the control circuit is connected with the grid drivers and the bases of the triodes; the grid drivers are connected with the grids of the IGBTs through the grid resistors; the collectors of the triodes are connected with the cathodes of the voltage stabilizing diodes; the anodes of the voltage stabilizing diodes are connected with the grids of the IGBTs; the current transformer is connected in series to a motor coil; the output end of the current transformer is connected with the input end of the overcurrent protection circuit; and the output end of the overcurrent protection circuit is connected with the control circuit. Through adoption of the IGBT protection circuit and protection method, the protection times of overcurrent are reduced, and the working efficiencies of the drivers are increased.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an IGBT overcurrent protection method and protection circuit in a stepping motor driver. Background technique [0002] IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) is a common electronic device in stepper motor drivers, used for PWM (Pulse-Width Modulation, pulse width modulation) power conversion of the driver circuit. In operation, when the internal current of the PWM power conversion circuit of the stepper motor driver commutates and the stepper motor brakes or reverses, the inductive element inside the stepper motor will release the reverse current, causing the current in the IGBT to increase sharply. If the current value exceeds the safe working area of ​​the IGBT, the IGBT will be damaged. At this time, the stepper motor driver is required to turn off the IGBT for protection. [0003] At present, the protection method of IGBT mainly uses delay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08H02H7/20
Inventor 高慧斌马泽龙
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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