A Novel Design of a High Gain Step-Up Converter Using Switched-Capacitors/Switched-Inductors Cells

摘要

This paper addresses a two level power switched capacitors boost converter (PSC-boost) for high voltage gain applications. The difficulty to provide a high voltage gain by the conventional boost converter is the main purpose behind this design. The proposed design is an integration of a PSC converter and a conventional boost converter. The PSC switched-capacitors and the conventional boost converter are respectively cascaded as a primary and a secondary side of the proposed converter. Without alerting the secondary side (conventional boost), the conversion ratio can be increased by adding more switched-capacitors cells. The proposed converter similarly acts as a multilevel boost converter (MBC); however, the MBC converter fails at a higher duty cycle. Determining the proposed converter's ability at a higher duty cycle manner shows a subtle difference between the simulated and calculated results. Another implementation to the proposed converter is by inserting a switched inductor model instead of the secondary side's inductor. Five switches, five capacitors, seven diodes and three inductors are needed to build a PSC-boost switched-inductor converter. The PSC-boost converter's parameters are the input voltage, the output voltage, primary side switching frequency and the secondary side switching frequency which are chosen as 12 V, 192 V, 200 KHz and 100 KHz respectively. The MATLAB/SIMULINK and the LTspice simulators were used to determine the proposed model.