IC693APU300RR
IC693APU300RR
单端反激变换电路是脉冲变压器原副边隔离多输出的结构，原边开关Q1导通，从同名端的标注可知，副边感应电压因二极管D反向不能产生回路电流，原边输入能量以磁能形式存储在隔离变压器(也是电感器)中;当开关Q1断开时，二极管D正向偏置导通，副边对电容充电和对负载供电的电流。由于开关Q1与二极管D的工作相位相反，即开关Q1关断时D开通，耦合能量经副边传至负载，因此称作反激式变换器。该电路的优点就是简单，只需要一个磁元件，一个开关就可以完成多输出隔离，降、升压的要求。
该电路的磁元件设计有要求，它既是隔离变压器，又是储能的电感，在多绕组输出时要求有良好的交叉调节特性(即副边绕组相互之间耦合小)。由于隔离变压器具有储能作用，为了使磁芯不易饱和，一般使用软磁粉末压制的磁芯并增加磁芯气隙来增大磁芯的储能，使其不易达到饱和。
IC693APU300RR
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豫公安备 41010502000017号