A low stress, high voltage, switched capacitor and active switched inductor DC-DC converter

A novel, high voltage gain, non-isolated, non-coupled DC-DC converter is proposed for applications such as PV systems, HEV, aerospace, and so forth. The proposed converter consists of two active switches in parallel, which are turned on and off simultaneously, two inductors in parallel and switched capacitors arrangements. During charging, both the inductor comes in parallel with voltage source and effectively reduces the ripple current and inductor size. These factors attribute to the lower power loss and low cost. The voltage stress of the switches is at least 5 times lower than the output voltage, which allows the use of low Rdson$$ {\mathbf{R}}_{\mathbf{dson}} $$ switches. The voltage stresses of the diodes are also at least 2.5 times lower than the output voltage, which enables to use low forward voltage drop diodes, and hence, the total power loss due to diode will be further reduced. Lower capacitors' stress also results in reduced parasitics. The detailed steady-state analysis of the proposed converter and its comparison with the existing converters are presented. The efficiency of the proposed converter is highest. The hardware prototype of 325 W is implemented to boost the voltage by 18 times, and results are presented. The closed-loop analysis of the proposed converter is also carried out. The maximum efficiency of the proposed converter is reported 96% for 100 W and 93% for 300 W. A high voltage gain DC-DC converter having an active switched inductor is developed. The developed converter has low voltage stress. The efficiency is highest from its counterpart. image