The Analysis and Improvement of Start-Up Circuits Used in the Switch Power-Supply

This paper presents a variety of traditional switching power supply auxiliary start circuits, and analyzes the characteristics and the defects of these circuits. On this basis, then proposes revised a start-up circuit of high voltage switch power-supply to solve the high loss-power problems derived from traditional start-up methods. Experimental results show that this new starting circuit has self-starting function. In addition, it provides a more universal way of circuit design for high voltage switching power supply.