Power supply having power status indicator with reduced power consumption

• US 7,633,273 B2
• Filed: 12/14/2006
• Issued: 12/15/2009
• Est. Priority Date: 06/06/2006
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Yang, Yongbin, Lin, Dong
• Primary Examiner(s): Patel; Rajnikant B
• Application Number:
  US11/610,647
• Publication Number:
  US 20070279017A1
• Time in Patent Office: 1,097 Days
• Field of Search: 363/17, 363/24, 363/37, 363/41, 363/55, 363/131, 363/132, 363/43, 363/89, 307 64- 66, 307/125, 323282-288, 323/222, 323/271, 323/272
• US Class Current: 323/222
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• 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

What is concerned is a power supply having a power status indicator, in which the power status indicator is powered by a constant voltage source, such as a constant voltage provided by an auxiliary power supply or a reference voltage provided for the internal control circuitry. Or otherwise, the power status indicator is connected in series with a feedback circuit or a protection circuit of the power supply, and the current-limiting resistor thereof is eliminated. In this way, the power consumption of the power supply under the standby mode is reduced, and the energy utilization of the power supply is enhanced.

Claims

1. A power supply comprising:

a power converter stage for converting an input power into an output power;

a signal processing circuit for regulating a voltage or a current of the output power based on the variation of the voltage or the current of the output power;

a constant voltage source for providing a constant voltage lower than an output voltage of the power converter stage; and

a power status indicator connected across the constant voltage source and a ground terminal for being powered by the constant voltage provided by the constant voltage source to display the power status of the power supply, wherein the power status indicator is connected in series with the signal processing circuit, and configured to be driven by the current flowing through the signal processing circuit to display the power status of the power supply.

2. The power supply according to claim 1 wherein the power converter stage is an AC-DC converter stage.

3. The power supply according to claim 1 wherein the constant voltage source is an auxiliary power supply output.

4. The power supply according to claim 1 wherein the constant voltage source is a reference voltage for a control circuitry of the power converter stage as a criterion for voltage comparison.

5. The power supply according to claim 1 wherein the power status indicator comprises:

a light-emitting device for emitting lights to display the power status of the power supply; and

a current-limiting resistor connected in series with the light-emitting device for limiting the current flowing through the light-emitting device.

6. The power supply according to claim 5 wherein the light-emitting device comprises a light-emitting diode.

7. A power supply comprising:

a power converter stage for converting an input power into an output power;

a signal processing circuit for regulating a voltage or a current of the output power based on the variation on the voltage or the current of the output power; and

a power status indicator connected to an output terminal of the power converter stage and connected in series with the signal processing circuit, and configured to be driven by the current flowing through the signal processing circuit to display the power status of the power supply.

8. The power supply according to claim 7 wherein the signal processing circuit comprises a feedback circuit.

9. The power supply according to claim 7 wherein the signal processing circuit comprises a pulse-width modulation controller.

10. The power supply according to claim 7 wherein the signal processing circuit comprises a protection circuit.

11. The power supply according to claim 7 wherein the power converter stage is an AC-DC converter stage.

12. The power supply according to claim 7 wherein the power status indicator comprises a light-emitting device for emitting lights to display the power status of the power supply.

13. The power supply according to claim 12 wherein the light-emitting device comprises a light-emitting diode.

14. A power supply comprising:

a power converter stage for converting an input power into an output power;

a signal processing circuit for regulating a voltage or a current of the output power based on the variation on the voltage or the current of the output power;

an auxiliary power supply for converting the input power into an auxiliary power; and

a power status indicator connected to an output terminal of the auxiliary power supply and connected in series with the signal processing circuit, and configured to be driven by the current flowing through the signal processing circuit to display the power status of the power supply.

15. The power supply according to claim 14 wherein the signal processing circuit comprises a feedback circuit.

16. The power supply according to claim 14 wherein the signal processing circuit comprises a pulse-width modulation controller.

17. The power supply according to claim 14 wherein the signal processing circuit comprises a protection circuit.

18. The power supply according to claim 14 wherein the power converter stage is an AC-DC converter stage.

19. The power supply according to claim 14 wherein the power status indicator comprises a light-emitting device for emitting lights to display the power status of the power supply.

20. The power supply according to claim 19 wherein the light-emitting device comprises a light-emitting diode.