Non-isolated common-grounded high step-up DC-DC converter with continuous source current suitable for low power applications.

This paper proposes a non-isolated high step-up switched-capacitor dual-switch DC-DC converter for low-power applications. The proposed converter benefits from high voltage gain, low voltage stress on the devices, continuous input current, availability of common-ground point, and simple structure. The proposed converter provides the voltage gain of 10 at mild duty cycle of 50%, where the per-unit voltage stress of S and S switches are 20 and 40%, respectively. In such condition, the highest voltage stress on the diodes will be limited to 67%. The synchronous operation of the switches in proposed converter leads to only 2 operational modes in continuous conduction mode (CCM), which makes the control of the converter very straightforward. The interleaved structure divides the input current between the inductors, which accordingly reduces the losses on the input devices. This study contains detailed steady-state analysis of proposed converter in CCM and DCM operations. It also provides the loss (and efficiency) analysis as well as the design procedure of the devices. The comparison section evaluates the competitiveness of the proposed converter compared to other existing similar counterparts. The average state-space method and small signal analysis have been used to model the proposed topology. The appropriate dynamic operation of proposed converter has been verified by simulation analysis. The experimental results confirm the correct performance of the proposed converter.