Design of IGBT Drive Protection Circuit Based on ACPL-T350

Abstract

The IGBT drive circuit using the optocoupler has a simple structure and low cost, and is very suitable for driving medium and low power IGBT modules. However, a common problem in the optocoupler drive circuit is the Miller effect problem in the process of the bridge arm being turned off. If the Miller effect is too large, high current will cause damage to the IGBT module caused by the second turn-on, and the protection capability of the circuit is weak. When a fault such as a short circuit occurs, the fault signal cannot be fed back in time to stop the operation. In order to solve this problem, a drive circuit based on ACPL-T350 optocoupler driver chip and its unipolar power supply power supply circuit and protection circuit are designed to effectively suppress the Miller effect and can be quickly protected in the event of a short circuit. The experimental results demonstrate the feasibility and correctness of the method.