摘要
直流稳压电源是电子技术常用的设备之一,广泛的应用于教学、科研等领域。传统的多功能直流稳压电源功能简单、难控制、可靠性低、干扰大、精度低且体积大、复杂度高等。本次设计是采用MOSFET管型设计开关型稳压电源，利用成熟的PWM脉冲调制控制芯片uc3842，制作了一个稳压方式采用并联型稳压电路，通过PWM脉冲调制IC电路，有限流，限压，截流保护的输出可调的，能稳定，高精度输出36CV电压与2A电流的直流稳压电源，主要克服了（1) 输出电压是通过粗调(波段开关) 及细调(电位器)来调节，需要在一个小范围内改变时(如1. 05～ 1. 07V ) ,困难就较大。另外, 随着使用时间的增加, 波段开关及电位器难免接触不良, 对输出会有影响。2) 稳压方式均是采用串联型稳压电路, 对过载进行限流或截流型保护, 电路构成复杂,稳压精度也不高。
关键词：PWM 稳压电源 MOSFET
ABSTRACT
DC power supply electronic technology is one of the commonly used equipment, widely used in teaching, research and other fields. The traditional multi-function features a simple DC power supply, Nan Kongzhi, low reliability, interference, accuracy and low volume, high complexity. The design is a type of MOSFET switching power supply design, use of mature PWM pulse modulation control chip uc3842, produced a regulator means using parallel regulator circuit, through the PWM pulse modulation IC circuits, a limited flow, pressure limiting , The closure of the protection of the adjustable output, stable, high-precision output voltage and current DC power supply, mainly to overcome the (1) output voltage through the rough-(switch-band) and fine-tune the (potential) to adjust , To be in a small area changes (such as 1. 05 ~ 1. 07V), on larger problems. In addition, with increased use of time, the band switches and potentiometers inevitable connection is bad, the output will be affected. 2) regulator means are used in series regulator circuit, had set a limit on the flow or closure of protection, a complex circuit, the regulator accuracy is not high.
Key words: PWM power supply MOSFET
