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。
This article proposes the operating principle and the program block-diagram of the automatic switching control to the main circuit-breaker on board of each powered unit of the train at proper time.
本文介绍了该装置对列车各车组适时进行主断路器自动分合闸控制的工作原理及程序框图。
Preferably, the inverter unit further comprises a conductive plate (50) that covers the control board (17) and is electrically connected to the conductive pattern (92).
逆变器单元 优选还包括覆盖控制基板（17）并与导电图案（92）电连接的导电板 （50）。
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