正反激励式准谐振软开关电源

Quasi resonant soft switching power supply for positive and negative incentive mode

以UCC28600D芯片为核心,结合正、反激励共用方式构建准谐振软开关电源。以正激励为主,正、反激励相互配合,拓展功率输出能力;采用定功率法设计开关电源变压器,控制反激励电压值略高于输入线电压;有效发挥谐振作用,降低激励管开通损耗和开通噪声,利用滤波电感的续流作用消除正激励整流二极管的关闭噪声。所设计的开关电源具有高度洁净的输出电压,电源输出口的扰讯电压和开关周期的脉动电压均限制在5 mV以下,整体工作效率达85%,开关电源中正、反激励共用方式具有明显优势。

This paper designed a kind of quasi resonant soft switching sower supply based on chip UCC28600D as the core, and combined with positive and negative incentive mode. Based on positive incentive and cooperate with negative incentive, can ex pand the power output capacity. Designed switching power transformer by constant-power method, The resonant circuit eliminated the the opening noise of exciter tube and close noise of positive exciter tube. The continued flow effect of the filter inductor elimi- nated the close noise of positive incentive rectifier diode. All these makes the design of the switching power supply with a hightly spotless output voltage, the disturbance voltage of power output port and pulsating voltage of switching cycle are below 5 mV, and working efficiency can be 85 %. These reflect the advantages of positive and negative incentive in switching power supply.