Title :
Novel Over-Current Protection for Peak Current Regulated DC-DC Converter
Author :
Qiu, Xun ; Fang, Yu ; He, Liang ; Xing, Ya ; Wang, Huizhen
Author_Institution :
Suzhou Vocational Univ., Suzhou
Abstract :
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.
Keywords :
DC-DC power convertors; PWM power convertors; electrical safety; overcurrent protection; switching convertors; UC3846 PWM controller; constant peak current limitation; current limit function; interleaved dual-forward converter; operation safety; overcurrent protection; peak current regulated DC-DC converter; power switches; protection circuit; synchronous slope compensation; Circuits; Current control; Current limiters; DC-DC power converters; Inductors; Industrial Electronics Society; Protection; Pulse width modulation; Switches; Voltage;
Conference_Titel :
Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE
Conference_Location :
Taipei
Print_ISBN :
1-4244-0783-4
DOI :
10.1109/IECON.2007.4459943
