Novel double switch voltage-lift Cuk converter

High voltage conversion with a continuous input and output current is the prime requirement for electric vehicles and renewable energy applications. In this paper, a new topology based on the Cuk converter is proposed to meet the high step-up gain, reduced switch stress, and continuous input current requirements. The topology is derived from the Cuk converter by using two switches, three inductors, a voltage-lift capacitor, and switched-capacitors. When compared to conventional converters, the proposed converter achieves a high step-up gain with reduced switch stress. Since the topology does not consist of a coupled inductor or transformer structure, voltage spikes during the turnoff process are eliminated. In addition, by simply varying the duty ratio of the two switches, a wide output voltage range is possible. The duty cycle and the switching pulses for the two switches are identical. Hence, the operation and control are simple. To analyze the topology, the continuous conduction mode of operation, voltage, and current stress of the devices, as well as an efficiency analysis are discussed. Finally, a 690 W prototype is implemented to experimentally examine and investigate the proposed converter.