A Novel Over-Current Protection Technique Applied to Peak-Current Type DC-DC Converter
Yu Fang, Tengfei Wei, Liang He, Yong Xie, Yan Xing
DOI: 10.4236/jemaa.2010.26045   PDF    HTML     7,155 Downloads   12,087 Views   Citations


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.

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Y. Fang, T. Wei, L. He, Y. Xie and Y. Xing, "A Novel Over-Current Protection Technique Applied to Peak-Current Type DC-DC Converter," Journal of Electromagnetic Analysis and Applications, Vol. 2 No. 6, 2010, pp. 352-356. doi: 10.4236/jemaa.2010.26045.

Conflicts of Interest

The authors declare no conflicts of interest.


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