基于微处理器的大电流模拟继电器的设计

摘要

Due to the limitation of the traditional switch devices, high current switching power supply has small power, low ef-ficiency .After analyzing the PWM soft switching technology , the adjustable frequency and duty ratio of PWM pulse outputs by using AT89C52 microcontroller interrupt, switch or off the large power GT40T101 are controlled, then the control of on-off of the circuit is realized by simulating a relay.By building the circuit,the superiority of PWM in the control of high power soft switching power supply is verified, which has a certain reference value for the practical application of electrical engineering .%由于受到传统开关器件的限制，大电流开关电源存在功率小、效率低等问题，在对PWM软开关技术进行分析后，利用AT89 C52单片机的中断方式输出频率和占空比可调的PWM脉冲，控制大功率开关管GT40 T101的通断，从而实现以模拟继电器的方式控制电路的通断。通过搭建电路验证了PWM软开关在控制大功率电源方面的优越性，对于实际的电气工程应用具有一定的参考价值。