LED lighting device and illumination apparatus including same

• US 8,723,436 B2
• Filed: 02/16/2012
• Issued: 05/13/2014
• Est. Priority Date: 02/22/2011
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Watanabe, Koji, Mizukawa, Hiromitsu, Matsuda, Kenji
• Primary Examiner(s): Le, Tung X
• Application Number:
  US13/398,078
• Publication Number:
  US 20120212148A1
• Time in Patent Office: 817 Days
• Field of Search: 315/209.R, 315/224, 315/225, 315/226, 315/246, 315/274, 315/276, 315/291, 315/294, 315/297
• US Class Current: 315/224
• CPC Class Codes: H02H 9/001 limiting speed of change of electric quantities, e.g. soft switching on or off progressive control of electronic switches for eliminating interferences H03K17/16
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/375 using buck topology
• CPC Class Codes: H05B 45/38 using boost topology

Abstract

An LED lighting device includes two or more switching circuits connected between a power source and an LED (light emitting diode) unit, an inrush current limiting circuit which limits an inrush current flowing through the LED lighting device when power is turned on and a trigger circuit which generates a trigger signal of an operation/non-operation of the inrush current limiting circuit from the switching circuits. Further, the inrush current limiting circuit is set in a non-operation state when any one of the switching circuits is started first.

Claims

1. An LED lighting device comprising:

two or more switching circuits connected between a power source and an LED (light emitting diode) unit;

an inrush current limiting circuit which limits an inrush current flowing through the LED lighting device when power is turned on; and

a trigger circuit which generates a trigger signal of an operation/non-operation of the inrush current limiting circuit from the switching circuits,

wherein the inrush current limiting circuit is set in a non-operation state when any one of the switching circuits is started first.

2. The LED lighting device of claim 1, wherein the trigger circuit uses a voltage of a secondary winding of coils of each of the switching circuits.

3. An illumination apparatus comprising:

the LED lighting device of claim 2.

4. An illumination apparatus comprising:

the LED lighting device of claim 1.