精密數(shù)控直流電源設(shè)計(jì)

摘要：主要論述了基于dsPIC30f4013的高精度數(shù)控直流電源的設(shè)計(jì)原理及實(shí)現(xiàn)方法。該穩(wěn)壓電源以開關(guān)穩(wěn)壓芯片LM2596為基礎(chǔ)，把開關(guān)直流穩(wěn)壓電源的高效率性和嵌入式系統(tǒng)的高精度數(shù)據(jù)采集處理能力相結(jié)合，用I2C總線的數(shù)字電位器MAX5478實(shí)現(xiàn)輸出電壓的微步進(jìn)調(diào)節(jié)。設(shè)計(jì)的開關(guān)電源具有輸出電流保護(hù)功能、LCD1602實(shí)時顯示電壓電流、矩陣鍵盤人機(jī)交互功能。軟件采用MAPLAB編譯，整個系統(tǒng)經(jīng)過測試運(yùn)行穩(wěn)定。 敘詞：開關(guān)電源 電流保護(hù) dsPIC30f4013 矩陣鍵盤 Abstract：The article Mainly discusses the design principle and method of high-precision digital controlled DC power supply based on dsPIC30f4013. The power supply is based on the switching regulator chip LM2596 ,which combine the high-efficiency switching devices and high-precision data acquisition and processing capabilities. In the system, digital potentiomete MAX5478 that based on I2C bus is used to achieve the adjustment of output voltage. The switch power supply system has the following function which can achieve the output over current protection, LCD1602 real-time display the voltage and current, matrix keyboard interactive features. MAPLAB compile is used to write software. The entire system has been tested to run stably. Keyword：Switch power supply, Protection of over current, dsPIC30F4013, Matrix keyboard