Improved Degaussing Power Supply Applied to Ship Degaussing System

A full-bridge circuit is applied in the traditional degaussing power supply to achieve output polarity switching. The limited output minimum current and the complicated circuit configuration affect the equipment performance. Thus, a bipolar DC-DC converter is proposed in this paper to achieve the output polarity switching and adjust the current amplitude. Compared with traditional degaussing power supply, The improved degaussing power supply consists of fewer power semiconductor devices and the output voltage is smooth at zero crossings, especially suitable for low resistance coils. This paper analyzes the operation mode of the bipolar DC-DC converter, derives the voltage gain expression of the converter, and proposes an equivalent analysis method based on the Buck-Boost circuit to make the output characteristics of the converter and the features of the circuit more intuitive. Finally, the output capability of the improved degaussing power supply structure is verified by simulation. The result has verified the improved degaussing power supply structure meets the power requirements of the ship’s degaussing system.