【摘要】 本文简介了PWM集成电路HEF4752,给出了系统控制电路框图及各主要部分的电路图。为了提高系统的可靠性笔者采取了两项主要措施:一是提出了一种正确检测异步电动机工作状态的方法,实现了对电流、电压的有效限制:二是提出了一种不用电压隔离器的简单、快速的过流保护电路。更多还原

【Abstract】 The PWM integrated circuit HEF 4752 is simply introduced in this paper.The block diagram for the control circuit and the circuit for each main parts of the system are given. In order to improve the reliability of the system,the method for correct detection of the operating condition of the induction motor is presscnted therefore the restriction of the current and the voltage are realized,and a simple quick-overcurrcnt protection circuit without voltage isolator is also prcssented.更多还原