| 摘要 |
<p>The present invention relates to a safe control circuit for a valve actuator, and more specifically, to a safe control circuit for a valve actuator, which is designed to supply AC power during operation. According to a current heating control system, a valve control box does not need safety certification. Valve control box suppliers don′t have knowledge on electrical safety, or intentionally ignore electrical safety because of money. In an attempt to solve the problems, the safe control circuit is effectively manufactured to have smaller number of components needed for a motor driver compared to existing products. Thus, cost can be reduced. A program controls the circuit. The circuit receives a control signal, so can perform individual control according to a related set. A user can use the circuit without restriction of a proportional control method and an on/off control method.</p> |
