Display apparatus, power supply apparatus and power supply method thereof

摘要

Disclosed is a display apparatus including an image processor configured to process an image signal, a display configured to display an image based on the image signal, a controller configured to control the display of the image, and a power supply configured to supply actuating power to the controller, the power supply including a power circuit configured to receive alternating current (AC) power and output the actuating power by a switching mode, a noise reducer configured to reduce high-frequency noise due to the switching mode, and a discharging circuit configured to supply a residual voltage of the noise reducer to the power circuit when the AC power is input, and discharge the residual voltage of the noise reducer when the AC power is shut off. Thus, it is possible to decrease power consumption caused when the residual voltage of the noise reducer is discharged.

主权项

1. A display apparatus comprising:
an image processor configured to process an image signal; a display configured to display an image based on the image signal; a controller configured to control the display of the image; and a power supply configured to supply actuating power to the controller, the power supply comprising:
a power circuit configured to receive alternating current (AC) power when the AC power is input and output the actuating power using a switching mode;a noise reducer configured to reduce high-frequency noise due to the switching mode; anda discharging circuit configured to:
when the AC power is input, charge a charging capacitor based on an input voltage of the AC power, and if a level of the input voltage is lower than a first threshold level, discharge the voltage charged in the charging capacitor, andwhen the AC power is shut off, charge the charging capacitor based on the residual voltage of the noise reducer, and if the voltage charged in the charging capacitor has a level equal to or higher than a second threshold level, discharge a residual voltage of the noise reducer when the AC power is shut off, wherein the second threshold level is higher than the first threshold level.