ELECTRONIC APPARATUS AND POWER CONTROLLING METHOD THEREOF

• US 20140056033A1
• Filed: 05/03/2013
• Published: 02/27/2014
• Est. Priority Date: 08/23/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: WOO, Won-myung, Lee, Jin-hyung
• Granted Patent: US 9,444,348 B2
• Time in Patent Office: Days
• US Class Current: 363/21.01
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 3/335 using semiconductor devices only
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An electronic apparatus and a power controlling method thereof are provided. The electronic apparatus includes a system unit supplied with power to conduct an operation, and a power supply unit including a power control unit controlling output of standby power, and supplying the standby power to the system unit. The power control unit includes a pulse width modulation (PWM) generation unit generating a PWM signal and a first switching unit switched on/off based on an external input signal to selectively supply power to the PWM generation unit. Thus, power consumption of the electronic apparatus in the standby mode is minimized to facilitate conformance with power regulations in accordance with an energy saving policy.

Claims

1. An electronic apparatus comprising:

a system unit supplied with power to conduct an operation; and

a power supply unit comprising a power control unit controlling output of standby power, and supplying the standby power to the system unit,

wherein the power control unit comprises a pulse width modulation (PWM) generation unit generating a PWM signal and a first switching unit switched on/off based on an external input signal to selectively supply power to the PWM generation unit.

2. The electronic apparatus of claim 1, wherein the power supply unit further comprises a first capacitor charged with preset voltage, and the first switching unit detects the external input signal using the voltage charged in the first capacitor.

3. The electronic apparatus of claim 2, wherein the power control unit further comprises a current source outputting preset current to the first capacitor.

4. The electronic apparatus of claim 1, wherein the external input signal is supplied from the system unit or an external device.

5. The electronic apparatus of claim 4, wherein the external input signal is input in accordance with a state of supply of the standby power to the system unit.

6. The electronic apparatus of claim 1, wherein the power supply unit further comprises a second switching unit receiving the output power from the power control unit to operate.

7. The electronic apparatus of claim 6, wherein the power supply unit further comprises a conversion unit outputting the output power from the second switching unit to a secondary terminal based on a preset transformation ratio.

8. The electronic apparatus of claim 7, wherein the power supply unit further comprises an output unit outputting direct current (DC) power to the system unit by rectifying and filtering the power from the secondary terminal of the conversion unit.

9. The electronic apparatus of claim 8, wherein the power supply unit further comprises a feedback unit feeding back the DC power from the output unit to a feedback terminal of the power control unit.

10. A power controlling method of an electronic apparatus comprising a system unit supplied with power to conduct an operation and a power supply unit supplying standby power to the system unit, the method comprising:

monitoring an external input signal using a first switching unit provided in a power control unit controlling an output of the standby power; and

waking-up the power control unit by switching the first switching unit on when an on signal input from outside the power control unit is detected as a result of the monitoring.

11. The method of claim 10, wherein the waking up comprises supplying power to a pulse width modulation (PWM) generation unit provided in the power control unit.

12. The method of claim 10, wherein the power control unit further comprises a current source outputting preset current to a first capacitor of the power supply unit, and the monitoring detects the external input signal using voltage charged in the first capacitor.

13. The method of claim 10, wherein the external input signal is supplied from the system unit or an external device.

14. The method of claim 13, wherein the external input signal is input in accordance with a state of supply of the standby power to the system unit.

15. The method of claim 10, further comprising receiving the output power from the power control unit and switching the output power by a second switching unit.

16. The method of claim 15, further comprising outputting the output power from the second switching unit to a secondary terminal of a conversion unit having a preset transformation ratio.

17. The method of claim 16, further comprising outputting direct current (DC) power to the system unit by rectifying and filtering the power from the secondary terminal of the conversion unit.

18. The method of claim 17, further comprising feeding back the DC power unit to a feedback terminal of the power control unit.

19. A method of reducing power consumption in an electronic apparatus including a power control unit, the method comprising:

monitoring a signal external to the power control unit using a switching unit controlling an output of standby power; and

waking-up the power control unit by switching the switching unit on when an on signal is detected by the monitoring.