Abstract
In this study, a new zero voltage switching (ZVS) synchronous buck converter with ultra-high step-down conversion ratio is introduced. By combining coupled inductors and energy-transferring capacitors, operating duty cycle is significantly extended while the voltage stress across the switches is reduced. Thereby, extremely low voltage gain can be achieved and the conduction loss is reduced owing to using switches with lower voltage rating. Also, by applying the interleaved method and complementary pulses for switches, the current stress and the output current ripple are reduced. In the proposed converter, soft switching condition is achieved for all switches without any auxiliary circuit. As a result, the overall efficiency of the introduced converter is improved. The converter operation and its design considerations are discussed. Experimental results are presented to validate the theoretical analysis.
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