RECTANGULAR LED LIGHTING APPARATUS

• US 20140312771A1
• Filed: 05/31/2013
• Published: 10/23/2014
• Est. Priority Date: 04/17/2013
• Status: Abandoned Application

• Current Assignee: Posco Led Company Ltd. (TMS Co., Ltd.)
• Original Assignee: Posco Led Company Ltd. (TMS Co., Ltd.)
• Inventors: LEE, Deok Ju, Kim, Dae Won, Yoon, Seong Bok, Park, II
• Application Number:
  US13/907,208
• Publication Number:
  US 20140312771A1
• Time in Patent Office: Days
• US Class Current: 315/113
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/345 Current stabilisation; Maintaining constant current
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices

Abstract

A rectangular LED lighting apparatus connected directly to an AC power supply is provided. The rectangular LED lighting apparatus includes: a printed circuit board in which circuit patterns are formed for electrical connection of LEDs; a rectification unit configured to rectify an AC voltage and output a DC rectified voltage; an LED unit driven by the rectified voltage, the LED unit including first to n-th light emitting blocks (where n is a positive integer equal to or greater than 2) arranged linearly on the printed circuit board; and an LED driving control unit configured to sequentially drive first to m-th light emitting groups (where m is a positive integer equal to or greater than 2), each of which includes n LEDs, according to a voltage level of the rectified voltage output from the rectification unit.

Claims

1. A rectangular light emitting diode (LED) lighting apparatus, comprising:

a printed circuit board in which circuit patterns are formed for electrical connection of LEDs;

a rectification unit configured to rectify an alternating current (AC) voltage and output a direct current (DC) rectified voltage;

an LED unit driven by the rectified voltage, the LED unit including first to n-th light emitting blocks, where n is a positive integer equal to or greater than 2, the first to n-th light emitting blocks arranged linearly on the printed circuit board; and

an LED driving control unit configured to sequentially drive first to m-th light emitting groups, where m is a positive integer equal to or greater than 2, each of which includes n LEDs, according to a voltage level of the rectified voltage output from the rectification unit,

wherein each of the first to n-th light emitting blocks includes first to m-th LEDs arranged linearly, and each of the first to m-th LEDs is sequentially turned on and off according to the voltage level of the rectified voltage.

2. The rectangular LED lighting apparatus of claim 1, wherein the printed circuit board is a printed circuit board having a horizontal length longer than a vertical length,

the first to n-th light emitting blocks are sequentially arranged on the printed circuit board in a horizontal direction, and

the first to m-th LEDs are sequentially arranged on the printed circuit board in a horizontal direction within the light emitting block.

3. The rectangular LED lighting apparatus of claim 1, wherein the printed circuit board comprises:

a first conductive circuit pattern formed on a top surface of the printed circuit board; and

a second conductive circuit pattern formed on a bottom surface of the printed circuit board.

4. The rectangular LED lighting apparatus of claim 1, wherein the printed circuit board includes a through-hole passing through top and bottom surfaces, and the through-hole includes a heat conductive member inside.

5. The rectangular LED lighting apparatus of claim 4, wherein the printed circuit board further comprises a first heat sink pattern formed on the bottom surface thereof and connected to the heat conductive member.

6. The rectangular LED lighting apparatus of claim 5, wherein the printed circuit board further comprises a second heat sink pattern formed on the top surface thereof and connected to the heat conductive member.

7. The rectangular LED lighting apparatus of claim 6, wherein the LED contacts the second heat sink pattern.

8. The rectangular LED lighting apparatus of claim 4, wherein the heat conductive member is a metal pattern formed along an inner surface of the through-hole.

9. The rectangular LED lighting apparatus of claim 5, wherein the first heat sink pattern is made of a metal.

10. The rectangular LED lighting apparatus of claim 6, wherein the second heat sink pattern is made of a metal.

11. The rectangular LED lighting apparatus of claim 4, wherein the inside of the through-hole is filled with a heat conductive resin.

12. The rectangular LED lighting apparatus of claim 3, further comprising:

a heat sink; and

an insulating heat sink member interposed between the printed circuit board and the heat sink.

13. The rectangular LED lighting apparatus of claim 12, wherein the insulating heat sink member comprises:

an insulating base film; and

a heat conductive adhesive coated on both sides of the base film.

14. The rectangular LED lighting apparatus of claim 13, further comprising a release prevention member configured to prevent the printed circuit board from being released from the heat sink.

15. The rectangular LED lighting apparatus of claim 14, wherein the release prevention member is a hook with a latch protrusion, and the heat sink includes a coupling groove coupled to the latch protrusion of the hook.

16. The rectangular LED lighting apparatus of claim 1, further comprising an optical member configured to diffuse light emitted from the plurality of LEDs.

17. The rectangular LED lighting apparatus of claim 16, wherein a ratio of a gap between the plurality of LEDs and the optical member to a pitch of the light emitting block is in a range from 1.2 to 0.8.