Patent ID: 8494382
Filing Date: 2013-07-23
Classification: G03G

Abstract:
1. A switching mode power supply apparatus comprising: an alternating current (AC) power input unit to receive a first AC voltage from an AC power supply source; a first rectifier to output a first direct current (DC) voltage by rectifying the received first AC voltage; a pulse width modulation (PWM) signal generator to output a PWM signal according to the first DC voltage; a transformer to transform the first DC voltage output from the first rectifier into a second AC voltage according to a turn ratio and to output the second AC voltage according to the PWM signal; a second rectifier to output a second DC voltage by rectifying the second AC voltage output from the transformer; a feedback unit to provide as feedback to the PWM signal generator a change of the second DC voltage output from the second rectifier; a DC power input unit to receive a third DC voltage from a DC power supply source; a DC voltage input detector to detect whether the third DC voltage is input to the DC power input unit; and an AC power input controller to stop generation of the second DC voltage when the DC voltage input detector detects that the third DC voltage is input to the DC power input unit.