电流型反激式开关电源的环路补偿设计

Compensation Loop Design of Switch Power Supply with Current Flyback Type

峰值电流控制模式是反激式开关电源设计中最流行方式的之一,与电压型控制方式相比它更容易进行补偿。负反馈环路补偿是开关电源设计的关键,目前多采用环路补偿方式实现,以适应负载和电网的突变。本文以一款三路输出反激式开关电源的环路补偿设计为例进行了详尽分析,对环路参数进行了定量计算并搭建了硬件电路。经验证,该设计方法具有较好的通用性,满足设计要求。

Control mode of the peak current is one of the most popular topologies in design of the flyback switching power supply, which is easier to compensate comparing with the voltage-control mode. But the negative feedback compensation is the key to design the switching power supply. At present, loop compensation mode is designed to adapt to mutation in the load and grid. This paper takes loop compensation design with a three-way output as an example, and carries out a detailed analysis. Simultaneously, the paper also calculates the component parameters on the loop compensation, and builds the hardware circuit. The experiments show that the design is of better versatility and meets the requirements of the design.