IGBT全桥逆变隔离驱动辅助电源的设计

Design of auxiliary power supply for IGBT full-bridge inverter isolation driver

全桥逆变电路作为大功率变换器的主要拓扑形式,其功率开关管工作的可靠性对电路的稳定运行具有关键性的作用。针对高压电源IGBT全桥逆变主电路专用驱动模块M57962L隔离供电的问题,设计了具有11绕组,9路隔离输出的反激式开关电源。详细介绍了反激变压器的设计方法以及基于三端集成稳压器TL431与线性光耦PC817的二阶环路补偿网络,包括磁芯的选取、匝数、线径、原边电感、气隙的计算以及环路补偿网络的理论分析与Saber仿真分析。仿真分析与样机测试结果表明:该电路设计有效,输出电压稳定,纹波小于100 m V,负载调整率高,在驱动源头上解决了IGBT运行的可靠性问题。

As the main topology of high-power converter, the reliable working state of full-bridge inverter power switch plays an important role in the stable operation of the circuit. In this paper, a flyback switching power supply with 11-winding and 9-output is designed for the isolated power supply of the M57962 L drive module used in the high voltage power supply IGBT full-bridge inverter main circuit. The design of flyback transformer and the second-order loop compensation network based on the three-termi-nal integrated voltage regulator TL431 and liner optocoupler PC817 are introduced in detail, including the selection of core, turns,diameter, primary inductance, air gap calculation and the theoretical analysis and Saber simulation analysis of the loop compensation network. Simulation and prototype test results show that the circuit design is effective. The output voltage is stable with the ripple less than 100 m V. The load regulation rate is high, and the reliability of IGBT operation is solved at the source of the driver.