Apparatus and method for controlling power saving mode in a power supply

• US 6,369,643 B1
• Filed: 10/22/1999
• Issued: 04/09/2002
• Est. Priority Date: 10/22/1998
• Status: Expired due to Term

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Dong Ju, Pyeon, Dae Beum
• Primary Examiner(s): LE, DINH THANH
• Application Number:
  US09/422,730
• Time in Patent Office: 900 Days
• Field of Search: 327/541, 327/99, 327/544, 327/143, 327/144, 455/343, 395/750, 363/89, 363/95
• US Class Current: 327/544
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: H04W 52/0293 having a sub-controller with a low clock frequency switching on and off a main controller with a high clock frequency
• 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
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The apparatus for controlling a power supply, which supplies power to loads, includes a low frequency clock generator generating a low frequency clock, a high frequency clock generator generating a high frequency clock, and a controller. The controller controls operation of the power supply. While operating at the low frequency clock in a first mode, if the controller receives an input signal, the controller determines if the input signal includes a predetermined portion. The controller then switches to operation at the high frequency clock in a second mode if the input signal is determined to include the predetermined portion.

Claims

1. An apparatus for controlling a power saving mode of a switching mode power supply in accordance with receiving a remote control key input signal, comprising:

a low frequency clock generator for generating a low frequency clock signal;

a high frequency clock generator for generating a high frequency clock signal;

a receiver for receiving said remote control key input signal from a remote controller;

a selector for selecting one of the low frequency clock generator and the high frequency clock generator; and

a microcomputer for detecting a header of the remote control key input signal received by the receiver and controlling the selector to select output of the high frequency clock generator based on the detected header portion of the remote control key input signal, wherein said microcomputer generates control signals to said switching mode power supply and operates according to a selected one of the low and high frequency clock signals.

2. The apparatus of claim 1, wherein the frequency of the low frequency clock generator is not lower than a frequency of the header of the remote control input signal.

3. The apparatus of claim 1, wherein the switching mode power supply does not supply power to a load while the low frequency clock generator is selected.

4. The apparatus of claim 1, wherein the switching mode power supply supplies power to a load while the high frequency clock signal generator is selected.

5. The apparatus of claim 1, wherein when the microcomputer detects an operation command of the remote control key input signal indicating a power-on request, the microcomputer controls the switching mode power supply to supply power to a load based on the detected operation command of the remote control key input signal.

6. The apparatus of claim 5, wherein the microcomputer selects the low frequency clock signal when the microcomputer does not detect the operation command of the remote control key input signal indicating a power-on request.

7. The apparatus of claim 5, wherein the frequency of the operation command of the remote control key input signal is not higher than the high frequency clock signal from the high frequency clock generator.

8. A method for controlling a power saving mode of a switching mode power supply in response to receiving a remote control key input signal, comprising:

generating a low frequency clock and a high frequency clock;

receiving a remote control key input signal while a microcomputer, which controls operation modes of the switching mode power supply, operates at the low frequency clock;

detecting a header of the received remote control key input signal; and

selecting a high frequency clock signal to operate the microcomputer in a normal mode based on the detected header of the received remote control key input signal.

9. The method of claim 8, wherein the frequency of the low frequency clock is not lower than the frequency of the header of the received remote control input signal.

10. The method of claim 8, wherein the switching mode power supply operates in a power saving mode and does not supply power to a load while the microcomputer operates at the low frequency clock.

11. The method of claim 8, wherein the switching mode power supply operates in a normal mode and supplies power to a load while the microcomputer operates at a high frequency clock.

12. The method of claim 8, further comprising:

detecting an operation command of the received remote control key input signal indicating a power-on request while the microcomputer operates at the high frequency clock; and

controlling the switching mode power supply to supply power to a load based on the detected operation command of the received remote control key input signal.

13. The method of claim 12, further comprising:

selecting the low frequency clock to operate the microcomputer when no operation command of the received remote control key input signal is detected.

14. The method of claim 12, wherein the frequency of the operation command of the received remote control key input signal is not higher than the high frequency clock.

15. An apparatus for controlling a power saving mode of a switching mode power supply in accordance with receiving a remote control key input signal, comprising:

low frequency clock generator means for generating a low frequency clock signal;

high frequency clock generator means for generating a high frequency clock signal;

receiver means for receiving said remote control key input signal from a remote controller;

selector means for selecting one of the low frequency clock generator means and the high frequency clock generator means; and

microcomputer means for detecting a header portion of the remote control key input signal received by the receiver means and controlling the selector means to select output of the high frequency clock generator means based on the detected header portion of the remote control key input signal, wherein the frequency of the low frequency clock generator means is not lower than a frequency of the header portion of the remote control input signal.