LED lamp and driving apparatus for the same

• US 7,888,882 B2
• Filed: 01/30/2008
• Issued: 02/15/2011
• Est. Priority Date: 01/30/2008
• Status: Expired due to Fees

• Current Assignee: Alliance Optotek Co., Ltd.
• Original Assignee: Alliance Optotek Co., Ltd.
• Inventors: Lin, Ching-Hsien, Wang, Chien-Lung
• Primary Examiner(s): Philogene; Haissa
• Application Number:
  US12/022,181
• Publication Number:
  US 20090189534A1
• Time in Patent Office: 1,112 Days
• Field of Search: 315/209.R, 315/247, 315/224, 315/307, 315/312, 315/291, 315/156, 363/24, 363/37, 363/41, 363131-133, 362/296.01, 362543-545, 362/549, 362/800
• US Class Current: 315/291
• CPC Class Codes: H05B 45/36 Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: H05B 45/39 Circuits containing inverter bridges
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An LED lamp including at least one LED is electrically connected to a utility input voltage. A driving apparatus located inside a lamp holder of the LED lamp includes an input rectifying/filtering unit to accept the utility input voltage; an isolated power inverter electrically connected to the input rectifying/filtering unit to generate an a buck A.C.; an output rectifying/filtering unit electrically connected to the isolated power inverter to generate an output D.C. voltage to drive the at least one LED. The components of the driving apparatus could be located inside the LED lamp, and the components can provide an isolation protection against the utility input voltage. The driving apparatus can more precisely control output D.C. voltage, current, and power as output D.C. voltage and current signals sent from the output rectifying/filtering unit are feedbacked to a photo coupler signal feedback unit.

Claims

1. An LED lamp driving apparatus electrically connected between a utility input voltage and at least one LED, comprising:

an input rectifying/filtering unit that receives the utility input voltage;

an isolated power inverter that is electrically connected to the input rectifying/filtering unit to receive an output of the input rectifying/filtering unit to generate a buck A.C.;

an output rectifying/filtering unit that is electrically connected to the isolated power inverter to receive the buck A.C. of the isolated power inverter and then to rectify and filter the buck A.C. into an output D.C. voltage; and

a voltage/current limiting unit that is electrically connected to the input rectifying/filtering unit to restrict output voltage and output current of the input rectifying/filtering unit.

2. The LED lamp driving apparatus as claimed in claim 1, further comprising an EMI filter unit that is between and electrically connected to the utility input voltage and the input rectifying/filtering unit.

3. The LED lamp driving apparatus as claimed in claim 1, further comprising:

a photo coupler signal feedback unit that is electrically connected to the output of the output rectifying/filtering unit; and

a feedback and control unit that is electrically connected to the photo coupler signal feedback unit and the input rectifying/filtering unit, and uses the photo coupler signal feedback unit to feedback the output of the output rectifying/filtering unit to feedback and control the input rectifying/filtering unit.

4. The LED lamp driving apparatus as claimed in claim 1, wherein the input rectifying/filtering unit, the isolated power inverter, and the output rectifying/filtering unit are located inside a lamp holder of the LED lamp.

5. The LED lamp driving apparatus as claimed in claim 1, further comprising:

an output peripheral protection unit that is electrically connected to the output rectifying/filtering unit to provide over-current, over-voltage, and over-temperature protections for the output rectifying/filtering unit.

6. An LED lamp receiving an utility input voltage, comprising:

a metal lamp cup;

a lamp holder that is connected to the metal lamp cup;

at least one LED located inside the metal lamp cup; and

a driving apparatus located inside the lamp holder, comprising;

an input rectifying/filtering unit that receives the utility input voltage;

an isolated power inverter that is electrically connected to the input rectifying/filtering unit to receive an output of the input rectifying/filtering unit to produce a buck A.C.; and

a voltage/current limiting unit that is electrically connected to the input rectifying/filtering unit to restrict output voltage and output current of the input rectifying/filtering unit; and

an output rectifying/filtering unit that is electrically connected to the isolated power inverter to receive the buck A.C. of the isolated power inverter and then to rectify and filter the buck A.C. into an output D.C. voltage to drive the at least one LED.

7. The LED lamp as claimed in claim 6, wherein the driving apparatus further comprises:

an output peripheral protection unit that is electrically connected to the output rectifying/filtering unit to provide over-current, over-voltage, and over-temperature protections for the output rectifying/filtering unit.

8. The LED lamp as claimed in claim 7, wherein the driving apparatus further comprises an EMI filter unit that is electrically connected between and electrically connected to the utility input voltage and the input rectifying/filtering unit.

9. The LED lamp as claimed in claim 7, wherein the driving apparatus further comprises:

at least one photo coupler signal feedback unit that is electrically connected to the output of the output rectifying/filtering unit; and

a feedback and control unit that is electrically connected to the at least one photo coupler signal feedback unit and the input rectifying/filtering unit, and uses the at least one photo coupler signal feedback unit to feedback the output of the output rectifying/filtering unit to feedback and control the input rectifying/filtering unit.