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光耦是一种把发光元件和光敏元件封装于同一壳体中,中间通过电-光-电的转换来传输电信号的半导体光电子器件。为了解决直流电机运行时产生的电流尖峰脉冲量和高频电压毛刺信号对主控电路及驱动电路造成的干扰,设计了基于普通光耦的直流电机驱动控制电路和基于线性光耦的直流电机反馈电流隔离采样电路。并在超临界分析系统的自动背压调节阀的控制中验证了其可行性,在应用中充分体现了光耦器件体积小、响应速度快、隔离效果好和具有较强的抗干扰能力。
An optocoupler is a semiconductor optoelectronic device that encapsulates a light-emitting element and a light-sensitive element in the same housing and transmits electrical signals through electro-optic-electrical conversion. In order to solve the interference of the main circuit and the driving circuit caused by the current spikes and the high-frequency voltage glitch signals generated during the operation of the DC motor, a DC motor drive control circuit based on a common optocoupler and a DC motor feedback based on a linear optocoupler Current isolation sampling circuit. And the feasibility of the automatic back pressure regulating valve in the supercritical analysis system is verified. The application shows that the optocoupler has the advantages of small volume, fast response, good isolation effect and strong anti-interference ability.