Title:
LED ILLUMINATION CIRCUIT AND LED ILLUMINATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/001756
Kind Code:
A1
Abstract:
Provided are an LED illumination circuit and LED illumination device, with which it is possible to alter LED brightness, and LED failure due to excessive increase in temperature or excess current is prevented. An inductor (12) and a switching circuit (13), which by means of a switch can select a capacitor (131) and a short circuit in series with a circuit to which a voltage doubler rectifier circuit (11) is connected, are provided between power supply input terminals (T1, T2) for inputting an AC power supply and an LED group (142) to which a plurality of LEDs (411 to 41n) are connected in series. When the switch (132) has selected the short circuit, current flowing in the LED group (142) flows through the short circuit and the LED group (142) assumes a normal light emission state in which light is emitted at a normal brightness. When the switch (132) has selected the capacitor (131), the current that flows in the LED group (142) flows through the capacitor (131) and is reduced, and the LED group (142) assumes a low-brightness light emission state in which light is emitted at a low brightness.
Inventors:
SUGIMORI HIDEO (JP)
Application Number:
PCT/JP2012/004033
Publication Date:
January 03, 2013
Filing Date:
June 21, 2012
Export Citation:
Assignee:
ALCO GIKEN LTD (JP)
SUGIMORI HIDEO (JP)
SUGIMORI HIDEO (JP)
International Classes:
H05B37/02; F21S2/00; F21V23/00; F21V23/04; H01L33/00; F21Y101/02
Foreign References:
| JP2011049075A | 2011-03-10 | |||
| JPS59148593A | 1984-08-25 | |||
| JP2011113643A | 2011-06-09 | |||
| JP2011100666A | 2011-05-19 | |||
| JP2011100667A | 2011-05-19 |
Attorney, Agent or Firm:
WATANABE, KIHEI (JP)
Kihei Watanabe (JP)
Kihei Watanabe (JP)
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Claims: