摘要
直流穩壓電源是電子技術常用的設備之一,廣泛的應用于教學、科研等領域。傳統的多功能直流穩壓電源功能簡單、難控制、可靠性低、干擾大、精度低且體積大、復雜度高等。本次設計是采用MOSFET管型設計開關型穩壓電源，利用成熟的PWM脈沖調制控制芯片uc3842，制作了一個穩壓方式采用并聯型穩壓電路，通過PWM脈沖調制IC電路，有限流，限壓，截流保護的輸出可調的，能穩定，高精度輸出36CV電壓與2A電流的直流穩壓電源，主要克服了（1) 輸出電壓是通過粗調(波段開關) 及細調(電位器)來調節，需要在一個小范圍內改變時(如1. 05～ 1. 07V ) ,困難就較大。另外, 隨著使用時間的增加, 波段開關及電位器難免接觸不良, 對輸出會有影響。2) 穩壓方式均是采用串聯型穩壓電路, 對過載進行限流或截流型保護, 電路構成復雜,穩壓精度也不高。
關鍵詞：PWM 穩壓電源 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
