數控直流穩(wěn)壓電源設計


論文摘要：本系統(tǒng)以直流電壓源為核心，AT89S52單片機為主控制器，通過鍵盤來設置直流電源的輸出電壓，設置步進等級可達0.1V，輸出電壓范圍為0—9.9V，最大電流為330mA，并可由液晶屏顯示實際輸出電壓值。系統(tǒng)有過流保護電路，當輸出電流過大時功率管自動截至，而且有紅色指示燈發(fā)出警報。本系統(tǒng)由單片機程控輸出數字信號，經過D/A轉換器（AD0832）輸出模擬量，再經過運算放大器隔離放大，控制輸出功率管的基極，隨著功率管基極電壓的變化而輸出不同的電壓。實際測試結果表明，本系統(tǒng)實際應用于需要高穩(wěn)定度小功率恒壓源的領域。
關鍵詞： 直流穩(wěn)壓電源　單片機　數字控制

　　Abstract：This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values. This system consists of microcontroller program output digital signal, through D/A converter (AD0832) output analog amplifier, through isolating amplifier output power, control of base, with the power to change the passive tube voltage output of different voltage. Test results show that this system application in need of high stability of small power constant-voltage source fields.

Keywords： regulated power supply of direct current; single2ch ip m icrocomputer, digital control