IGBT driving protection system

Abstract

The invention relates to an IGBT driving protection system. The system comprises an IGBT driver and an IGBT fault feedback module; the IGBT driver comprises a Vce detection unit used for short-circuit protection, an active clamping circuit used for overvoltage protection, a first connector used for being connected to a PCB with a digital processing unit and a second connector used for being connected to a built-in NTC thermistor of an IGBT module. The IGBT driver further comprises a DC / DC power source. The first connector comprises 20 pins, wherein the fifth pin and the seventh pin are used for being connected with a 15-V power source, the ninth pin is used for state outputting of a first channel, the thirteenth pin is used for state outputting of a second channel, the eleventh pin and the fifth pin are used for signal inputting, the seventeenth pin is used for mode selection, the nineteenth pin is used for blocking time setting, the first pin and the third pin are standby pins, and the other pins are grounded.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an IGBT-based drive protection system. Background technique [0002] At present, M57962AL is commonly used for IGBT overcurrent protection, which is an integrated circuit integrating drive and protection (called a hybrid drive module). (ON) is directly proportional to the collector current Ie. The size of Ie can be judged by detecting the size of Uce(ON). Different types of hybrid drive modules have different output capabilities, switching speeds, and du / dt tolerances. Use It should be selected appropriately according to the actual situation. The threshold voltage action value of the overcurrent protection of the hybrid drive module itself is fixed, generally 7-10V, so there is a problem of cooperating with the IGBT. The usual method is to adjust the number of diodes V connected in series between the IGBT collector and the drive module, such as figure 1 shown. The sum of the...

AI Technical Summary

Problems solved by technology

The modified method has the following disadvantages: 1. Hybrid drive modules are commonly used for overcurrent protection. The critical voltage action value of the hybrid drive module itself is fixed, and there is a problem with IGBT coordination. The accuracy is not high. The drive module and IGBT are integrated. The voltage between the electrodes cannot be continuously adjusted

2. Overvoltage protection, using laminated busbars to reduce stray inductance, and adding some low-resistance and low-inductance decoupling capacitors on the entire line can also reduce line inductance, but the cost is high

3. For overheating protection, radiators are generally used for forced air cooling, which is costly

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