A novel push-pull forward converter for high reliability and high input voltage applications

A novel push-pull forward converter (PPFC) is proposed in this paper. The converter is constructed by series connecting and coupling two forward converter cells via an integrated magnetizing core. Switches' voltage stress of this converter is clamped at input voltage and the leakage energy and magnetizing energy of the transformer are recycled. In addition, high reliability can be guaranteed since no direct-short path existed in the converter, which is the main consideration for applications where high-reliability is required, i.e. space and aircraft applications. All these features make the proposed PPFC suitable for high-reliability, high-input voltage, high power density power conversion applications. Operation principle and detailed analysis of the proposed converter are given and verified with experimental results. Furthermore, the topology principle is extended with another PPFC topology proposed based on the full-bridge converter.