Display apparatus, power supply apparatus and power supply method thereof

Patent metadata

Field	Value
Publication number	US-9564798-B2
Application number	US-201514755501-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Aug 8, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

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.

First claim

What is claimed is:

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; and
a 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, and
when 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.

2. The display apparatus according to claim 1 , wherein the power circuit further comprises a pulse width modulation (PWM) controller configured to control output of the actuating power using a PWM mode, wherein
the controller is further configured to supply the residual voltage of the noise reducer to the PWM controller when the AC power is input.

3. The display apparatus according to claim 2 , wherein the discharging circuit and the PWM controller are combined on a single integrated chip (IC).

4. The display apparatus according to claim 1 , wherein the discharging circuit comprises a charger/discharger configured to charge the charging capacitor with the residual voltage of the noise reducer in sync with a cycle of the AC power when the AC power is input, and to discharge the power charged in the charging capacitor.

5. The display apparatus according to claim 1 , wherein the discharging circuit comprises a transistor configured to turn off when the AC power is input, to supply the residual voltage of the noise reducer to the power circuit, to turn on when the AC power is shut off and the voltage charged in the charging capacitor has a level equal to or higher than the second level and to reduce the residual voltage of the noise reducer to a ground.

6. A power supply apparatus for supplying actuating power to a display apparatus, the power supply apparatus 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; and
a 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, and
when 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,

wherein the second threshold level is higher than the first threshold level.

7. The power supply apparatus according to claim 6 , wherein the power circuit further comprises a pulse width modulation (PWM) controller configured to control output of the actuating power using a PWM mode.

8. The power supply apparatus according to claim 7 , wherein the discharging circuit and the PWM controller are combined on a single integrated chip (IC).

9. The power supply apparatus according to claim 6 , wherein the discharging circuit comprises a charger/discharger configured to charge the charging capacitor with the residual voltage of the noise reducer in sync with a cycle of the AC power when the AC power is input, and to discharge the power charged in the charging capacitor.

10. The power supply apparatus according to claim 6 , wherein the discharging circuit comprises a transistor configured to turn off when the AC power is input, to supply the residual voltage of the noise reducer to the power circuit, to turn on when the AC power is shut off and the voltage charged in the charging capacitor has a level equal to or higher than the second threshold level, and to reduce the residual voltage of the noise reducer to a ground.

11. A method of controlling a display apparatus which comprises a power supply for supplying actuating power and processes an image signal to display an image,
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; and
a discharging circuit, and

the method comprising:
charging, by the discharging circuit, a charging capacitor based on an input voltage of the AC power while the AC power is input to the power circuit;
discharging, by the discharging circuit, the voltage charged in the charging capacitor if a level of the input voltage is lower than a first threshold level while the AC power is input to the power circuit;
charging, by the discharging circuit, the charging capacitor based on the residual voltage of the noise reducer when the AC power is shut off to the power circuit; and
discharging, by the discharging circuit, a residual voltage of the noise reducer when the AC power is shut off to the power circuit and the voltage charged in the charging capacitor has a level equal to or higher than a second threshold level,

wherein the second threshold level is higher than the first threshold level.

12. The method according to claim 11 , wherein the supplying the residual voltage of the noise reducer further comprises charging the charging capacitor of the discharging circuit with the residual voltage of the noise reducer in sync with a cycle of the AC power when the AC power is input, and discharging the power charged in the charging capacitor.

13. A method of controlling a power supply apparatus which comprises a power supply and supplies actuating power to a display apparatus processing an image signal and displaying an image,
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; and
a discharging circuit, and

the method comprising:
charging, by the discharging circuit, a charging capacitor based on an input voltage of the AC power while the AC power is input to the power circuit;
discharging, by the discharging circuit, the voltage charged in the charging capacitor if a level of the input voltage is lower than a first threshold level while the AC power is input to the power circuit;
charging, by the discharging circuit, the charging capacitor based on the residual voltage of the noise reducer when the AC power is shut off to the power circuit; and
discharging, by the discharging circuit, a residual voltage of the noise reducer, when the AC power is shut off to the power circuit and the voltage charged in the charging capacitor has a level equal to or higher than a second threshold level,

wherein the second threshold level

Assignees

• Samsung Electronics Co Ltd

Inventors

• Joo Sung-Yong
• Lee Jin-Hyung

Classifications

• H02M2001/322

  Electricity · mapped topic

• H02M1/36 Primary

  Means for starting or stopping converters · CPC title

• H02M7/217

  using semiconductor devices only · CPC title

• H02M1/322

  Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock · CPC title