Timing circuit is usually made up of power supply unit, panel circuit and timing board, it is the digital control part of power source.
定时电路一般由电源模块、面板电路和定时板组成，是功率源中的数字控制部分。
Alternating-direct-alternating circuit is adopted and CPLD is used as logic control device of power IGBT in main circuit of variance-frequency timing system.
变频调速系统主电路采用交-直-交形式，以可编程逻辑器件(CPLD)作为调速系统逆变电路功率开关器件IGBT的逻辑控制器件。
He article mainly introduces the application based on the PLC and Frequency conversion timing control system in use of the cycling water automation renovation system in the heat and power plant.
介绍了一种基于PLC与变频调速的控制系统在水系统自动化改造中的应用。
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