摘要
本文设计了一种用于降压型DC-DC转换器的过流保护电路。它采用折叠式共源共栅差分放大器对电感电流进行采样,并转换成电压输出到限流比较器。Hspice仿真结果表明该电路工作可靠、性能优良,可广泛应用于功率开关器件保护电路中。
A over-current protection circuit for step-down DC-DC converter is presented. In this circuit, the inductor current is sensed by a folded-cascade operational amplifier, and is transfer to a voltage. The Hspice simulation results proved the feasibility of the circuit. It can be applied in power semiconductor protect circuit.
出处
《微计算机信息》
北大核心
2007年第20期255-256,共2页
Control & Automation
基金
国家自然科学基金资助项目(60371017)
关键词
过流保护
电流采样
运放
over-current protection, current sensing, operational amplifier
