Open AccessA Novel Over-Current Protection Technique Applied to Peak-Current Type DC-DC Converter
Author(s) -
Yu Fang,
Tengfei Wei,
Liang He,
Yunxiang Xie,
Yan Xing
Publication year - 2010
Publication title -
journal of electromagnetic analysis and applications
Language(s) - English
Resource type - Journals
eISSN - 1942-0749
pISSN - 1942-0730
DOI - 10.4236/jemaa.2010.26045
Subject(s) - duty cycle , current (fluid) , compensation (psychology) , limit (mathematics) , computer science , pulse width modulation , control theory (sociology) , current limiting , controller (irrigation) , power (physics) , voltage , constant current , electrical engineering , constant (computer programming) , physics , control (management) , mathematics , engineering , psychology , mathematical analysis , agronomy , quantum mechanics , artificial intelligence , psychoanalysis , biology , programming language
The change of the over-current protection point of the power switches, caused by slope compensation, is analyzed in detail. It is discovered that the peak current protecting value increases as the duty cycle decreases. As a result, the safety operation of the switches is damaged greatly. A novel solution to improve over-current protection with constant peak current limitation is proposed by inducing synchronous slope compensation into the current limit function instead of the original constant voltage. The design principle and method of the protection circuit based on a UC3846 PWM controller for the interleaved dual-forward converter is presented. Experimental results are given to verify the analysis