The servo systems compare the feedback signal with input instruction, then convert the difference into compensatory instruction so to control the output component.

伺服系统将检测信号和输入指令进行比较，将差值转化从而控制输出元件。

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The system can realize traffic signal control to signalized intersection with difference signal phase and coordinated control of traffic signals.

该系统能对不同相位的信号交叉口的信号进行控制，同时具有信号的协调控制功能。

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The difference of output voltage of inverter and 220v is set as control signal, controller change the PWM signal to regulate buck-boost converter and three-phase rectifier.

以逆变器输出的电压和220v的差值作为控制信号。设计控制器根据控制信号改变直流变换器和三相可控整流的PWM控制信号。

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