摘要
针对电压型脉宽调制器(PWM)控制器只有电压控制环、电流变化滞后电压变化、系统响应速度慢、稳定性差等固有缺点,介绍了既有电压控制环、又有电流控制环的新型电流型PWM控制器。分析了电流型PWM控制器与电压型PWM控制器的控制原理,比较了二者之间的优缺点;介绍了电流型PWM控制器UC3844的工作原理,并应用电流型PWM控制器UC3844设计了微机电源,指出了设计中应该注意的问题。结果表明,由电流型PWM控制器构成的微机电源具有良好的电压调整率、负载调整率和系统稳定性等优点。
Voltage type PWM controller has only voltage control loop .The system based on current type PWM controller is slow in response and has low stability .The paper introduces a new current type PWM controller with both current control loop and voltage control loop. The current type PWM controller and the voltage type are compared and the advantages are pointed out. The principle of the current type PWM contro-ller UC3844 is described. The application of the current type PWM controller UC3844 to PC power supply is recommended. The results show that this PC power supply has high load regulation rate and high stability.
出处
《电子工程师》
2005年第1期42-44,共3页
Electronic Engineer
