An Efficient Subregulator for Outputs of Forward Converters

摘要

Of the many ways to derive well-regulated outputs on forward converters, the magnetic amplifier is one of the most popular, particularly for low-voltage, high-current outputs. This is the traditional way to derive a 3.3 V output from the existing 5 V secondary in forward converters found in the power supplies in personal computers. This paper describes an alternative approach, replacing the mag amp's saturable reactor with synchronous FET rectifiers and a new controller.