Adopted advanced sine energy distrlbuting technology,the main circuit is constructed by paralleling the sing entrgy distributor and the high power filter,When the output voltage Uo is changed because of the undulation of the supply voltage or the load,it control the SCR elements angle through sampling circuit,circuit,comparer and trigger unit to change the current which lead to the variety of the compensating voltage ??nd the phase,and reach to the target of stable output voltage