基于反激式开关电源电路实现与测试分析

摘要

this paper implement the switch power supply circuit,the design USES the lfyback type switch power supply structure design of the typical form of UC3842 as the core device, by using the basic principle of pulse width modulation,and USES the auxiliary power supply way for the power supply,is helpful to increase the output power of main power supply. Using ifeld effect tube as switching devices,the conduction and deadline fast,conduction loss is smal ,which guarantees efifcient performance of switch power supply.At the same time,supplemented by over-voltage and over-current protection circuit in the circuit,which guarantees system of work safety,pay attention to improve the circuit load regulation, enhances the working efifciency of the switching power supply,reduce the switching power supply output ripple voltage,reduce the electromagnetic interference,achieve the goal of green environmental protection.Adjustable output voltage,make its can be applied to different occasions.%本文实现了开关电源电路的实现，设计采用典型的反激式开关电源结构设计形式，以UC3842作为控制核心器件，运用脉宽调制的基本原理，并采用辅助电源供电方式为其供电，有利于增大主电源的输出功率。采用场效应管作为开关器件，其导通和截止速度很快，导通损耗小，为开关电源的高效性能提供保障。同时，电路中辅以过压过流保护电路，为系统的安全工作提供保障，本电路注意改善负载调整率，提高开关电源工作效率，降低开关电源输出纹波电压，降低电磁串扰，达到绿色环保的目的。输出电压可调，使其可适用于不同场合。