一、 开关电源的电路组成[/b]：： 开关电源的主要电路是由输入电磁干扰滤波器（EMI）、整流滤波电路、功率变换电路、PWM控制器电路、输出整流滤波电路组成。辅助电路有输入过欠压保护电路、输出过欠压保护电路、输出过流保护电路、输出短路保护电路等。 开关电源的电路组成方框图如下：(series are high performance fixed
frequency current mode controllers They are specifically designed for
integrated circuits feature a trimmed oscillator for precise duty cycle
control a temperature compensated referencehigh gain error
amplifier　current sensing comparator and a high current totem pole
output ideally suited for driving a power MOSFET
Also included are protective features consisting of input and)