反激开关电源初级侧RCD吸收回路的应用分析

Application Analysis of RCD Absorption Circuit On the Primary Side of Flyback Switching Power Supply

随着电源技术的不断发展进步,辅助电源是所有弱电控制的能量源,鉴于开关电源突出的优点,除某些要求特别高的场合外,将逐渐取代线性电源。其中为控制器提供弱电控制的电源功率一般较小,在目前的应用中普遍采用反激开关电源,为更好的保证电源质量和设计成本,其中初级侧的RCD吸收回路起到很重要的作用。本文从理论计算、元件选型、对比测试等角度出发,给出一定的分析,通过这些对比分析,从而提升产品开发的设计质量。

With the continuous development and progress of power supply technology,auxiliary power supply is the energy source of all weak current control.In view of the outstanding advantages of switching power supply,it will gradually replace the linear power supply in addition to some especially high requirements.Among them,the power supply which provides weak current control for the controller is generally small,and the flyback switch power supply is widely used in the current application,in order to better ensure the quality and design cost of the power supply,the RCD absorption loop on the primary side plays a very important role.In this paper,from the point of view of theoretical calculation,component selection,comparative test and so on,some analysis is given,through which the design quality of product development can be improved.