现代电子技术
現代電子技術
현대전자기술
Modern Electronics Technique
2015年
22期
139-141,146
,共4页
开关电源%MCU%SG3525%稳压电路
開關電源%MCU%SG3525%穩壓電路
개관전원%MCU%SG3525%은압전로
switching power supply%MCU%SG3525%voltage regulator circuit
设计了一款基于MCU控制的开关电源稳压电路,该系统主要由整流滤波电路、推挽式功率变换电路和控制电路组成,并通过MCU调节PWM控制开关电源输出电压.MCU输出的数字信号通过DAC0832转换为模拟信号,该模拟信号作为开关控制芯片SG3525第二管脚的基准电压,SG3525根据基准电压的变化自动产生PWM控制脉冲,调节开关管的输出脉宽,从而达到调节输出电压的目的.实验表明,输出电压可调范围为28~36 V,最大输出电流Imax=15 A,开关电源的效率为η=89%.
設計瞭一款基于MCU控製的開關電源穩壓電路,該繫統主要由整流濾波電路、推輓式功率變換電路和控製電路組成,併通過MCU調節PWM控製開關電源輸齣電壓.MCU輸齣的數字信號通過DAC0832轉換為模擬信號,該模擬信號作為開關控製芯片SG3525第二管腳的基準電壓,SG3525根據基準電壓的變化自動產生PWM控製脈遲,調節開關管的輸齣脈寬,從而達到調節輸齣電壓的目的.實驗錶明,輸齣電壓可調範圍為28~36 V,最大輸齣電流Imax=15 A,開關電源的效率為η=89%.
설계료일관기우MCU공제적개관전원은압전로,해계통주요유정류려파전로、추만식공솔변환전로화공제전로조성,병통과MCU조절PWM공제개관전원수출전압.MCU수출적수자신호통과DAC0832전환위모의신호,해모의신호작위개관공제심편SG3525제이관각적기준전압,SG3525근거기준전압적변화자동산생PWM공제맥충,조절개관관적수출맥관,종이체도조절수출전압적목적.실험표명,수출전압가조범위위28~36 V,최대수출전류Imax=15 A,개관전원적효솔위η=89%.
A voltage regulator circuit of the switching power supply based on MCU control was designed,which is com-posed of rectification filtering circuit,push-pull power conversion circuit and control circuit. In this circuit,the output voltage of the switching power supply is controlled by regulating PWM via the MCU. The digital signal output by MCU is converted into analog signal through the DAC0832. The analog signal is taken as the reference voltage of the second pin of the switching con-trol chip SG3525. SG3525 generates PWM control pulse automatically according to the variation of reference voltage to regulate the output pulse width of the switching tube,so the purpose of regulating the output voltage is achieved. The experimental re-sults show that the output voltage adjustable range is 28~36 V,the maximum output current is 15 A,and the efficiency of the switching power supply is 89%.
