POWER SUPPLY DEVICE AND CONTROL METHOD OF THE SAME

摘要

PURPOSE: A power supply and a controlling method thereof are provided to sense a plurality of power supply levels using a circuit of a simple structure. CONSTITUTION: A power factor correction(10) compensates the power factor of an inputted power supply. A standby power supply unit(20) is connected to the power factor correction. The standby power unit includes a transformer(21) with changing an input power into the standby power supply of the fixed level. A sensor(30) is located on the secondary side of the transformer. The sensor senses the level of an inductive power supply corresponding to the input power supply. A power controlling unit(50) supplies a driving power supply to a system unit(200).