摘要：In resent years, HIRFL DC power supply system upgrading is concentrated on middle power and low power output converters. Except small power supplies for corrector magnet, there are 183 power supplies in this part. The output power varies from 6 kW to 36 kW, current stability is from ±100 ppm to ±20 ppm per 8 hours. Most of them are used to drive trim coils of SSC and quadrupole magnets of beam transport line. There are