High-step-up single-switch DC–DC converter with low voltage spike

DC-DC converters using coupled inductors have been developed for many years. However, to prevent the high voltage spikes across main switches and diodes, the leakage inductance energy recycling will be an important issue. Consequently, a high-step-up single-switch DC-DC converter with low voltage stress is presented herein. The proposed converter integrates a coupled inductor and switched capacitors not only to realise a high voltage gain but also to recycle the leakage inductance energy. Accordingly, the voltage spikes on the switch and diodes can be clamped at some values as low as possible. Moreover, similar to the traditional boost converter, the source terminal of the MOSFET is connected to the ground. Therefore, no isolated driver is required. Eventually, the detailed analysis of the proposed converter and an experimental prototype with 12 V input voltage, 200 V output voltage and 100 W output power are provided to verify the effectiveness of the proposed converter.