To provide synchronization signal of line current for switchingcontrol in time, a method to forecast the crossover point of the current was given.
为及时向切换控制提供线路电流同步信号，提出了一种预测电流过零的方法。
2
In this paper, a pneumatic actuator position servo system is described, which controlled by a five-point switch PWM control method using high-speed switching valves.