摘要
介绍了以脉宽调制控制电路SG3525为控制核心的大电流低电压开关电源的设计。该电源主电路采用DC/DC全桥变换器,SG3525输出信号经光电隔离、功率放大后驱动主电路开关管IGBT,应用反馈技术和PWM调制技术实现电源稳定输出和输出电流连续可调。文中给出了主电路和控制及驱动电路的具体设计及主要电路参数。试验结果表明,该电源工作稳定,实现了输出直流电流从45A到90A连续可调。
A design for the switching power supply with large current and low voltage is presented, which is based on the Pulse Width Modulator control circuit named SG3525. The DC/DC full-bridge converter is used for the main circuit of the switching power supply. The output signals of SG3525 drive IGBTs of the main circuit after photoelectric isolation and power amplifier. In order to achieve the stable output and the continuously adjustable current, the technologies of feedback and PWM are applied to the switching power supply. This paper introduces the specific design and the primary circuit parameters of the main circuit, the control circuit and the drive circuit. The experimental results show that the switching power supply can steadily operate and continuously regulate the output current from 45A to 90A.
出处
《电测与仪表》
北大核心
2013年第4期120-124,共5页
Electrical Measurement & Instrumentation
