A High Step-Up DC-DC Converter With Switched-Capacitor and Coupled-Inductor Techniques

• Published in: IEEE journal of emerging and selected topics in industrial electronics (Print) Vol. 3; no. 4; pp. 1067 - 1076
• Main Authors: Zhang, Min, Wei, Zhengyi, Zhou, Mingzhu, Wang, Fenglian, Cao, Yichang, Quan, Limin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Capacitors; Circuits; Conduction losses; Coupled inductor; DC-DC power converters; dc–dc converter; high step-up; High voltages; High-voltage techniques; Inductance; Inductors; low voltage stress; switched capacitor; Switches; Voltage; Voltage converters (DC to DC); Voltage gain; Winding; Windings
• ISSN: 2687-9735; 2687-9743
• DOI: 10.1109/JESTIE.2022.3173909

This article proposes a high step-up dc-dc converter with single switch, which combines a multiplier voltage cell, two winding coupled inductor, and switched capacitor. The converter attained high voltage gain by the boost cell consisting of two winding coupled inductor and switched capacitor. A passive clamp circuit consisting of diode and capacitor can reduce the voltage spike of switch S and recover leakage inductance energy. Therefore, the power switch with low on -state resistance can be used, which will reduce the conduction losses of the switch S . The main properties of the suggested converter are high voltage gain with low turn ratio n at reasonable duty cycle D , and high efficiency. The operation modes and steady-state analysis are presented. Moreover, the stress of the components, theoretical efficiency analysis, and comparison with other dc-dc converters are analyzed and presented, respectively. Finally, a 200 W prototype construct in the laboratory based on the design guidelines verifies the validity of the suggested converter.