High Step-up Active-Clamp Converter with an Input Current Doubler and a Symmetrical Switched-Capacitor Circuit

Liangzong He; Tao Zeng; Tong Li; Yuxian Liao; Wei Zhou

High Step-up Active-Clamp Converter with an Input Current Doubler and a Symmetrical Switched-Capacitor Circuit

Vol. 15, No. 3, pp. 587-601, May 2015

10.6113/JPE.2015.15.3.587

Input current doubler

High step-up converter

Switched-capacitor

PDF Full-Text

Abstract

A high step-up dc-dc converter is proposed for photovoltaic power systems in this paper. The proposed converter consists of an input current doubler, a symmetrical switched-capacitor doubler and an active-clamp circuit. The input current doubler minimizes the input current ripple. The symmetrical switched-capacitor doubler is composed of two symmetrical quasi-resonant switched-capacitor circuits, which share the leakage inductance of the transformer as a resonant inductor. The rectifier diodes (switched-capacitor circuit) are turned off at the zero current switching (ZCS) condition, so that the reverse-recovery problem of the diodes is removed. In addition, the symmetrical structure results in an output voltage ripple reduction because the voltage ripples of the charge/pump capacitors cancel each other out. Meanwhile, the voltage stress of the rectifier diodes is clamped at half of the output voltage. In addition, the active-clamp circuit clamps the voltage surges of the switches and recycles the energy of the transformer leakage inductance. Furthermore, pulse-width modulation plus phase angle shift (PPAS) is employed to control the output voltage. The operation principle of the converter is analyzed and experimental results obtained from a 400W prototype are presented to validate the performance of the proposed converter.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

L. He, T. Zeng, T. Li, Y. Liao, W. Zhou, "High Step-up Active-Clamp Converter with an Input Current Doubler and a Symmetrical Switched-Capacitor Circuit," Journal of Power Electronics, vol. 15, no. 3, pp. 587-601, 2015. DOI: 10.6113/JPE.2015.15.3.587.

[ACM Style]

Liangzong He, Tao Zeng, Tong Li, Yuxian Liao, and Wei Zhou. 2015. High Step-up Active-Clamp Converter with an Input Current Doubler and a Symmetrical Switched-Capacitor Circuit. Journal of Power Electronics, 15, 3, (2015), 587-601. DOI: 10.6113/JPE.2015.15.3.587.