优劣电源对比1 80-85% 2 60% 1 + 2 3 1 PCB 400 100 2 3 4 filter (Analog Signal) ) 5 100mA 100mA KHz 25 3000 A X 22 2CZ QL 100KHz 2CLG 6 opticalcoupler OC LED “ ― ― ” 4N PC817A―C VCD DCD PC817A----C PC111 TLP521 LP632 TLP532 PC614 PC714 PS2031 4N25 4N26 4N……