Selection of Isolated DC-DC Converter for Low Power Applications with Current Double Rectifier

A high frequency, low voltage, high current DC-DC converter is most suitable for high speed electronic circuits like microprocessors, telecommunication networks etc. This paper presents the details regarding the selection of Isolated DC-DC converter for high current applications using Current Double Rectifier (CDR) among four isolated DC-DC Converters such as flyback, forward, push-pull and two switch forward converter. To increase the efficiency of the transformer, CDR is used at the output which has the property of one diode conduction drop, provides much higher conversion ratio without using high turns ratio, thereby reducing stress on the secondary side. All the above isolated converters like flyback, forward, push pull and two switch forward converters were designed and simulated and results were validated for 5V/10A at 100kHz switching frequency. For the same output power level Forward converter is found to be the most suitable among other isolated converters having minimum turns ratio and low leakage inductance.