Power supply device for LED and light emitting device having the same

• US 9,445,481 B2
• Filed: 03/15/2013
• Issued: 09/13/2016
• 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
• Primary Examiner(s): PHAM, THAI N
• Application Number:
  US13/836,838
• Publication Number:
  US 20140062332A1
• Time in Patent Office: 1,278 Days
• Field of Search: 315/160, 315/227.R, 315/228, 315/246.291, 315/294
• US Class Current: 1/1
• 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 supplying the AC power to an AC/DC rectifying unit of the wired controller;

wherein the standby power supply unit receives a reference standby voltage based on the driving voltage from the wired controller, stores the reference standby voltage in a capacitor, and supplies the reference standby voltage to the wireless controller as standby power through a power control unit;

wherein the standby power supply unit comprises;

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

wherein the capacitor is charged with the reference standby voltage and is discharged by supplying the reference standby voltage to the wireless controller;

wherein the switching unit comprises a first switch supplying the AC power to the wired controller, and a second switch supplying the reference standby voltage to the capacitor;

wherein when a lighting unit is turned off and a voltage level of the capacitor is greater than a first reference voltage and the capacitor is fully charged, the first switch and the second switch are turned off;

wherein when the lighting unit is turned on and the capacitor is in a discharge state, the first switch and the second switch are turned on; and

wherein when the lighting unit is turned off and the capacitor is not charged and a voltage level of the capacitor is lower than a second reference voltage, the first switch and the second switch are turned on.

2. The power supply device of claim 1, wherein the capacitor is a large-capacity capacitor charged with a voltage in a range of 3.6V to 5.5 V.

3. The power supply device of claim 1, 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

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

4. The power supply device of claim 1, wherein the wireless communication unit applies the standby power at a sleep mode to receive the lighting control signal.

5. 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;

wherein the lighting control unit further 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 supplying the AC power to the wired controller, 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;

wherein the standby power supply unit comprises;

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

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

wherein the switching unit comprises a first switch supplying the AC power to the wired controller, and a second switch supplying the reference standby voltage to the capacitor;

wherein when a lighting unit is turned off and a voltage level of the capacitor is greater than a first reference voltage and the capacitor is fully charged, the first switch and the second switch are turned off;

wherein when the lighting unit is turned on and the capacitor is in a discharge state, the first switch and the second switch are turned on; and

wherein when the lighting unit is turned off and the capacitor is not charged and a voltage level of the capacitor is lower than a second reference voltage, the first switch and the second switch are turned on.

6. The lighting apparatus of claim 5, wherein the capacitor is a large-capacity capacitor charged with a voltage in a range of 3.6V to 5.5V.

7. The lighting apparatus of claim 5, 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.

8. The lighting apparatus of claim 7, wherein the wireless communication unit applies the standby power at a sleep mode to receive the lighting control signal.

9. A method of driving a lighting apparatus comprises a lighting unit and a lighting control unit:

wherein the lighting unit comprises a plurality of lighting emitting diodes, and the lighting control unit receiving AC power through a wired controller, 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, and wherein the lighting control unit further comprises a capacitor storing a reference standby voltage generated from the AC power through the wired controller and supplying the reference standby voltage as standby power to a wireless controller for wirelessly receive the lighting control signal, the method comprising;

periodically checking a voltage level of the capacitor;

converting the voltage level to a predetermined voltage level;

charging the capacitor with the AC power when the predetermined 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 when the predetermined voltage level of the capacitor is higher than a level of a second reference voltage.

10. The method of claim 9, wherein the checking of the predetermined voltage level of the capacitor comprises:

initializing an operation of the lighting control unit;

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

reading a voltage of the capacitor.

11. The method of claim 10, wherein the charging of the capacitor with the AC power comprises:

determining when the lighting unit is in an off state;

determining when 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.

12. The method of claim 11, wherein the capacitor is a large-capacity capacitor charged with the predetermined voltage in a range of 3.6V to 5.5V.

13. The method of claim 10, wherein the charging of the capacitor with the AC power comprises:

determining when the lighting unit is in an off state;

determining when 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 the predetermined voltage of the capacitor is equal to or less than a reference voltage.