通过对电容器充电回路开关管进行控制，实现交流输入端的高功率因数。
High power factor at ac input can be achieved by controlling the switch of capacitor charge circuit.
详细分析了交流接触器在不同使用条件下的闭合与分断时触点两端电压与回路电流情况，并研究了AC1～AC4工作制下的控制时序。
The conditions of voltage between contactors and current in main circuit under different using types are analyzed in detail, then designed the control sequences with working mode AC1-AC4.
且不需对原交流接触器线圈和控制回路作任何改变，即可达到节电和无声运行的目的。
The coil and the control loop of the original AC contactor need not any change, the goal of electricity saving and silent running can be reached.
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