SWITCHING MODE POWER SUPPLY APPARATUS

摘要

PURPOSE: A switching mode power supply device is provided to reduce the number of resistors used for dividing a voltage by using a discharge resistor as a voltage divider. CONSTITUTION: An EMI filter(110) is connected to an AC voltage through a live terminal and a neutral terminal. An AC-DC block unit(120) generates and outputs a specific DC voltage using the AC voltage. An AC information providing unit(130) divides the level of a DC voltage and provides the divided result to an AC detecting unit(140). The AC information providing unit includes a first voltage dividing unit(132), a rectifying unit(134), and a second voltage dividing unit(136). The AC detecting unit generates a detection signal with normal or abnormal information of the AC power. [Reference numerals] (110) EMI filter; (120) AC-DC block unit; (132) Discharge and a first voltage dividing unit; (134) Rectifying unit; (136) Second voltage dividing unit; (140) AC detecting unit