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

Abstract

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 M57962L 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-terminal 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 mV. The load regulation rate is high, and the reliability of IGBT operation is solved at the source of the driver.

Keywords

• flyback power supply
• full-bridge inverter
• high-frequency transformer
• loop compensation
• Saber simulation