POWER SUPPLY DEVICE FOR LED AND LIGHT EMITTING DEVICE HAVING THE SAME

• US 20140062332A1
• Filed: 03/15/2013
• Published: 03/06/2014
• Est. Priority Date: 08/29/2012
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: KIM, Dae Hun
• Granted Patent: US 9,445,481 B2
• Time in Patent Office: Days
• US Class Current: 315/228
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

Disclosed is a power supply device including a wired controller receiving AC power to generate a driving voltage, and outputting a lighting driving signal, a wireless controller wirelessly receiving a lighting control signal and outputting the lighting control signal to the wired controller, and a standby power supply unit receiving a reference standby voltage based on the driving voltage, storing the reference standby voltage, and supplying the reference standby voltage to the wireless controller as standby power. In the lighting control device based on wired/wireless communication, the power is always obtained from the super capacitor to turn on the wireless controller, so that the turn-on state of the power generator of the wired controller is not always required. The power consumption is reduced by reducing the standby power.

Claims

1. A power supply device comprising:

a wired controller receiving AC power to generate a driving voltage, and outputting a lighting driving signal;

a wireless controller wirelessly receiving a lighting control signal and outputting the lighting control signal to the wired controller; and

a standby power supply unit receiving a reference standby voltage based on the driving voltage, storing the reference standby voltage, and supplying the reference standby voltage to the wireless controller as standby power.

2. The power supply device of claim 1, wherein the standby power supply unit comprises:

a switching unit used to supply the reference standby voltage according to a switching signal that is transmitted from the wireless controller; and

a capacitor charged with the reference standby voltage and discharged by supplying the reference standby voltage to the wireless controller.

3. The power supply device of claim 2, wherein the capacitor is a large-capacity capacitor charged with a voltage in a range of 3.6V to 5.5V.

4. The power supply device of claim 2, wherein the wireless controller comprises:

a wireless communication unit receiving and processing the lighting control signal from an outside through a wireless network;

a power generating unit receiving the reference standby voltage from the capacitor and converting the reference standby voltage into a voltage having a standby power level of the wireless communication unit; and

a power control unit detecting a voltage level of the capacitor to output the switching signal to the switching unit.

5. The power supply device of claim 4, wherein the switching unit comprises a first switch used to supply the AC power to the wired controller, and a second switch used to supply the reference standby voltage to the capacitor.

6. The power supply device of claim 5, wherein the first and second switches are simultaneously turned on or turned off.

7. The power supply device of claim 6, wherein the wireless communication unit uses the standby power at a sleep mode to receive the lighting control signal.

8. A lighting apparatus comprising:

a lighting unit including a plurality of lighting emitting diodes; and

a lighting control unit receiving AC power, and receiving a lighting control signal for the lighting unit through a wired scheme or a wireless scheme to output a lighting driving signal to the lighting unit,

wherein the lighting control unit comprises a capacitor storing a reference standby voltage generated from the AC power, and supplying the reference standby voltage as standby power to wirelessly receive the lighting control signal.

9. The lighting apparatus of claim 8, wherein the lighting control unit comprises:

a wired controller receiving the AC power to generate a driving voltage, and outputting the lighting driving signal;

a wireless controller wirelessly receiving the lighting control signal and outputting the lighting control signal to the wired controller; and

a standby power supply unit storing the reference standby voltage by receiving the reference standby voltage from the driving voltage, and supplying the reference standby voltage to the wireless controller as the standby power, and

wherein the capacitor constitutes the standby power supply unit.

10. The lighting apparatus of claim 9, wherein the standby power supply unit comprises a switching unit used to supply the reference standby voltage according to a switching signal that is transmitted from the wireless controller.

11. The lighting apparatus of claim 8, wherein the capacitor is a large-capacity capacitor charged with a voltage in a range of 3.6V to 5.5V.

12. The lighting apparatus of claim 9, wherein the wireless controller comprises:

a wireless communication unit receiving and processing the lighting control signal from an outside through a wireless network;

a power generating unit receiving the reference standby voltage from the capacitor and converting the reference standby voltage into a voltage having a driving voltage level of the wireless communication unit; and

a power control unit detecting a voltage level of the capacitor to output a switching signal to the switching unit.

13. The lighting apparatus of claim 12, wherein the switching unit comprises a first switch used to supply the AC power to the wired controller, and a second switch used to supply the reference standby voltage to the capacitor.

14. The lighting apparatus of claim 13, wherein the first and second switches are simultaneously turned on or turned off.

15. The lighting apparatus of claim 14, wherein the wireless communication unit uses the standby power at a sleep mode to receive the lighting control signal.

16. A method of driving a lighting apparatus including a lighting unit including a plurality of lighting emitting diodes, and a lighting control unit receiving AC power, receiving a lighting control signal for the lighting unit through a wired scheme or a wireless scheme to output a lighting driving signal to the lighting unit, and comprising a capacitor storing a reference standby voltage generated from the AC power and supplying the reference standby voltage as standby power to wirelessly receive the lighting control signal, the method comprising:

periodically checking a voltage level of the capacitor;

charging the capacitor with the AC power if the voltage level of the capacitor is lower than a first reference voltage; and

discharging the voltage of the capacitor as a voltage for standby power by cutting off the AC power if the voltage level of the capacitor is higher than a level of a second reference voltage.

17. The method of claim 16, wherein the checking of the voltage level of the capacitor comprises:

initializing an operation of the lighting control unit;

determining if a check event for the capacitor periodically occurs; and

reading a voltage of the capacitor.

18. The method of claim 17, wherein the charging of the capacitor with the AC power comprises:

determining if the lighting unit is in an off state;

determining if the capacitor is in a discharged state when the lighting unit is in an on state; and

charging the capacitor with a voltage branching from the AC power when the capacitor is in the discharged state.

19. The method of claim 17, wherein the charging of the capacitor with the AC power comprises:

determining if the lighting unit is in an off state;

determining if the capacitor is in a charged state when the lighting unit is in the off state; and

charging the capacitor with a voltage branching from the AC power when the capacitor is not charged, and when a voltage of the capacitor is equal to or less than a reference voltage.

20. The method of claim 18, wherein the capacitor is a large-capacity capacitor charged with a voltage in a range of 3.6V to 5.5V.