CIRCUIT FOR ELECTRIC POWER CONTROL AT THE OFF-MODE STATE

摘要

a switching means(10) switched by a level outputted from a control part if a vertical and a horizontal synchronization signal are not inputted; a photo coupler(20) feedbacking a current according to the switching of the switching means, being connected to the output terminal of the switching means; and a control means controlling the second side voltage of a switching transformer by controlling the basic switching frequency of the first side of the switching transformer according to the feedback current.