Design of low-voltage high-current rectifier with high-efficiency output side for electrolytic disinfection of ballast water

In ships the ballast water treatment system (BWTS) of using electrolytic disinfection needs low-voltage high-current rectifiers with such good performance as high efficiency, galvanic isolation between electric source and electrolysis module unit, light weight and small volume. Several rectifier schemes are reviewed as a kind of good rectifier candidate for BWTS and their comparison results are summarized. Based on the review and comparison results, we propose the new rectifier scheme for BWTS as one of the most suitable rectifier one. It is composed of 3 phase diode bridge, high-frequency DC/DC converter with galvanic isolation and synchronous rectification, and very low-frequency DC/AC inverter with high efficiency. The paper analyzes the proposed rectifier scheme and suggests the practical design guideline thoroughly in terms of both power circuit and control circuit, and finally verifies it by simulation results.