A power-on and power-off locking protection circuit for a servo drive igbt module

Abstract

The invention discloses a power-up and down-locking protection circuit of an IGBT module of a servo driver, which includes an optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, The first Zener diode, the first triode, the second triode, the third triode, and the MOS tube, the digital signal power threshold is set by the second resistor and the first Zener diode. When the digital signal power does not reach When the digital signal power threshold is at the threshold, the first triode is turned off. When the digital signal power rises to the digital signal power threshold, the first Zener diode breaks down, and the first triode is turned on. Through the conduction of the first triode Turn on and off, control the optocoupler to turn on or off, and protect the optocoupler; the comparison threshold is set by the fifth resistor, the first capacitor and the third transistor, and the input signal is compared after entering, and the third transistor The turn-on or turn-off of the optocoupler is controlled to protect the optocoupler, thus effectively avoiding the false turn-on of the IGBT module.

Description

technical field [0001] The present invention relates to a servo drive IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) module, in particular to a servo drive IGBT module power up and down locking protection circuit. Background technique [0002] In industrial production, servo drives are widely used. The control and protection of the IGBT module is the core technical issue of the servo driver. [0003] During the process of the whole servo driver going up and down, due to the uncertainty of the power-on and power-on sequence, the IGBT module is prone to be turned on by mistake. Especially in the case of an abnormality in the servo drive, the IGBT module is mistakenly turned on, resulting in short-circuit damage to the IGBT module is very common. [0004] The existing power-on and power-off protection forms of the IGBT module mainly control the power-on and power-on sequences of each power supply of the servo driver. One is to control the power-o...

AI Technical Summary

Problems solved by technology

[0005] However, with the above-mentioned first type of power-on and power-on protection, due to the complex structure of the power supply module used by the medium and high-power servo driver, the power supply has multiple channels and multi-level outputs, and there are multiple levels between the power-on of the IGBT-driven optocoupler and the power start-up. Delay, so the timing of power on and off is more stringent

Using the above two types of power-on and power-off protection forms will lead to poor stability of the servo drive and is prone to omissions, resulting in false turn-on of the IGBT module, resulting in short-circuit damage to the IGBT module

Images