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.
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。
2
In this regulator system, a DSP controls bi-directional IGBT triggered and turn-off at zero-crossing to control different combination of secondary coil and realize AC voltage stabilization.