| The interleaving flyback converter has virtues of simple topology, easy control, and it can realize electrical isolation. However, it has low voltage gain and high voltage stress of switches, and the hard switching reduces efficiency of the converter.To solve the problems above, the paper proposed a new isolated soft switching Boost converter with both its primary inductance and secondary inductance parallel connected, which was based on the winding-cross-coupled inductors. It inherits the virtues of interleaving flyback converter. It has two units working alternately, the power loss of the converter is distributed and the output voltage ripple frequency is twice of the switching frequency. The difference is that this converter has higher voltage gain and lower switch voltage stress. In aspect of soft switching, the converter uses active clamp circuit which makes the main switches and auxiliary switch realize the soft switching and prolongs the life of the converter. Compared with the interleaved flyback converter, the new one is more suitable for low voltage input and high voltage output application.Based on the new converter, an improved converter with two output clamp capacitances was proposed in the paper to reduce the voltage spike and the voltage stress of the output diode. The improved converter has higher efficiency and longer life.At last, some simulations and experiments were done to testify the rationality and the feasibility of the new isolated soft switching Boost converter with both its primary inductance and secondary inductance parallel connected, which was based on the winding-cross-coupled inductors.
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