In response to the demands for high efficiency of spaceborne synthetic aperture radar power converter,after comparing the topologies of various power supplies suitable for the spaceborne,a topology scheme of synchronous rectifier forward converter is proposed in this paper,which adopts a novel gate charge retention voltage-driven synchronous rectifier topology to solve the free-wheeling driving problem in transformer dead time.Circuit principle,radiation-hardened method,main components,parameter calculation methods are described in detail.A prototype with 50 V～70 V input and 5 V/6 A output is manufactured according to the proposed scheme.The characteristics of high efficiency,radiation-hardened and the accuracy of solution have been proven by experimental results.New forward converter can meet the requirements of the spaceborne power supply.
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