双向可控硅过零调功调速的技术实现方法

为实现对仔猪舍通风换气设备的无级调速控制，对电机调速进行了分析和研究。提出了一种以可控硅过零调功方式实现调速的控制方案。该方案采用过零触发方式，使可控硅输出完整的正弦波电压。不仅无高次谐波产生，而且不影响电网电压，不干扰通讯设备。系统的可控硅过零触发与主回路控制由软硬件协同完成．其中软件承担了主要的控制任务，从而简化了硬件设计，便于检修和维护。所提出的调速方案解决了仔猪舍通风电机的调速问题，为同类系统的开发提供了参考。

A speed control method by zero-crossing power adjustment

To realize the ventilator speed adjustment of a piglet house a control method by zero-crossing power adjustment of Silicon Controlled Rectifier (SCR) was developed based on the investigations and analyses of a motor speed control process. By means of a zero-crossing burst mode, the SCR exports complete sinusoidal wave voltage, which has no high-order harmonic produced, no influences on the voltage of power network, and no interferences on the communication apparatus. The hardware design of the system is simple and the apparatus are easy for overhauling and maintaining for its zero-crossing bursting and the main loop of the SCR are completed by a cooperative operation of the hardware and the software and the software plays a key role in the control process.