LED LIGHTING DEVICE AND LIGHTING EQUIPMENT

• US 20100052566A1
• Filed: 08/31/2009
• Published: 03/04/2010
• Est. Priority Date: 09/04/2008
• Status: Active Grant

• Current Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Takahashi, Yuji, Kitamura, Noriyuki
• Granted Patent: US 8,237,374 B2
• Time in Patent Office: Days
• US Class Current: 315/291
• 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: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• 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 lighting device including a DC power source circuit, a high frequency generation circuit which includes an inverter circuit having switching elements and a resonance circuit having a series-connected inductor and condenser, in which the switching elements are on-off controlled by a no-load resonance frequency of the resonance circuit, and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage, a rectification smoothing circuit having an input side which is connected between both edges of the condenser or both edges of the inductor; and a light emitting diode series connected to an output side of the rectification smoothing circuit.

Claims

1. An LED lighting device comprising:

a DC power source circuit;

a high frequency generation circuit including an inverter circuit having a switching element and a resonance circuit having a series-connected inductor and condenser, in which the switching element is on-off controlled by a frequency within a predetermined frequency band including a no-load resonance frequency of the resonance circuit, and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage;

a rectification smoothing circuit having an input side which is parallelly connected to the condenser or inductor so that the input high frequency AC voltage is rectified and smoothed for output; and

a light emitting diode series connected to an output side of the rectification smoothing circuit.

2. The LED lighting device according to claim 1, wherein

the predetermined frequency band is set to ±

5% with respect to the no-load resonance frequency.

3. A lighting equipment comprising:

the LED lighting device according to claim 1; and

an equipment main body in which a light emitting diode of the LED lighting device is provided.

4. A lighting equipment comprising:

the LED lighting device according to claim 2; and

an equipment main body in which a light emitting diode of the LED lighting device is provided.