A Transformerless High Step-up DC-DC Converter Based on Active Switched Capacitor Network

High step-up DC-DC converters are widely used in various applications such as renewable energy sources. The voltage gain of the conventional boost converter is limited by high voltage stress, high current ripple and low efficiency due to the high duty cycle ratio. In order to solve these problems, a step-up DC-DC converter based on active switched capacitor (ASC) network is proposed. In the proposed structure, both active switched capacitor (ASC) and active switched inductor (ASL) techniques are combined together with the switch and diode array to achieve high voltage gain. Employing three switches with two different duty cycles and increasing the voltage gain by adding only one extra diode and capacitor are the main advantages of this converter. Beside these advantages, unlike other voltage-boosting structures that utilized switched capacitor, the proposed converter avoids the extreme instantaneous currents of capacitor. The operational principles of the proposed converter in the continuous conduction mode (CCM), inductor and capacitor design and comparison of the proposed converter with other similar structures are presented in this article. Also, the parasitic elements are assumed to calculate the DC-voltage gain and the efficiency of the converter accurately. Finally, simulation results are presented in PSIM software to validate the feasibility of the proposed converter.