LED lighting device and illumination apparatus

• US 8,610,363 B2
• Filed: 09/02/2010
• Issued: 12/17/2013
• Est. Priority Date: 09/04/2009
• Status: Expired due to Fees

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Otake, Hirokazu, Asami, Kenichi
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US12/874,282
• Publication Number:
  US 20110057578A1
• Time in Patent Office: 1,202 Days
• Field of Search: 315/32, 315/51, 315/194, 315/291
• US Class Current: 315/194
• CPC Class Codes: H05B 45/3575 by means of dummy loads or bleeder circuits, e.g. for dimmers
• CPC Class Codes: H05B 45/375 using buck topology

Abstract

The present invention provides a pair of input terminals to which AC voltage is input, the AC voltage being phase-controlled by a dimmer for phase-controlling AC voltage of an AC source; a damping circuit which has a resistor inserted to a position, into which input current flows from the AC source via the dimmer in series, and a capacitor and an inductor which form a closed circuit together with the AC source and the dimmer, and suppresses high-frequency vibration generated in the dimmer when a phase control element of the dimmer is turned on; and an LED lighting circuit which rectifies AC voltage phase-controlled and input via the pair of input terminals, converts DC output voltage, which is obtained by rectification, so that the voltage adapts to a load, and lights the LED.

Claims

1. An LED lighting device comprising:

a pair of input terminals to which AC voltage is input;

a dimmer coupled to the input terminals and including a phase control element for phase-controlling AC voltage of an AC source;

a timer circuit for determining a timing for turning on the phase control element; and

a filter circuit;

a damping circuit including;

a first resistor connected to a node into which input current flows from the AC source via the dimmer;

a capacitor which is connected to the first resistor and in parallel to the AC source;

a second resistor which is connected in parallel to the AC source and in series with the capacitor; and

an inductor connected to the second resistor to form a closed circuit together with the AC source, the dimmer, the first resistor, the capacitor, and the second resistor;

the damping circuit suppressing high-frequency vibration generated in the dimmer when the phase control element of the dimmer is turned on; and

an LED lighting circuit including;

a rectifying circuit for rectifying AC voltage input via the pair of input terminals and phase-controlled by the dimmer; and

a converter for converting DC output voltage of the rectifying circuit so that the voltage adapts to an LED.

2. An illumination apparatus comprising:

an illumination apparatus main body;

the LED lighting device according to claim 1 disposed on the illumination apparatus main body; and

the LED which is connected to an output end of the converter of the LED lighting device being supported on the illumination apparatus main body.

3. The illumination apparatus according to claim 2,

wherein the illumination apparatus main body includes a cap which is connected to the AC source and receives current, and

in the LED lighting device, the resistor of the damping circuit is constituted by a fuse resistor and housed in the cap.