A New Zero Current Switching Ultra Step‐Up Converter With Low Input Current Ripple

This paper proposes a high step‐up converter featuring zero current (ZC) switching (ZCS) and continuous input current to enhance efficiency. The converter integrates switched capacitor and coupled inductor techniques to improve voltage gain while significantly reducing the voltage stress across the switch. Furthermore, the maximum voltage stress on the diodes remains unaffected by the increase in turn ratio, allowing for unrestricted turn ratio adjustment to boost the gain. ZCS is achieved without requiring auxiliary circuitry or extra switches. The use of pulse width modulation (PWM) for the switch simplifies the control circuit implementation. Additionally, the leakage inductance energy is efficiently absorbed by the clamping capacitor, preventing voltage spikes on the switch. Moreover, the switch source is grounded, enabling the drive circuit to be powered directly from the input. The converter is comprehensively analyzed, and both simulation results from PSPICE and experimental implementation results are presented to validate its performance. The results demonstrate a full‐load efficiency of 96.2%.