Title:
光源点灯装置及び照明装置
Document Type and Number:
Japanese Patent JP5289471
Kind Code:
B2
Abstract:
A power supply circuit drives circuits having different numbers of series-connected LEDs without changing a circuit constant or a component. An LED series circuit is connected to a power converter circuit of a power supply circuit. The power converter circuit is controlled by a control arithmetic circuit, and supplies a constant current to the LED series circuit. A voltage detection circuit detects a voltage applied to the LED series circuit. The control arithmetic circuit checks whether the LED series circuit has 40 LEDs or 20 LEDs, based on the voltage detected by the voltage detection circuit. The control arithmetic circuit holds a constant-current value table for 40 LEDs and a constant-current value table for 20 LEDs. In accordance with the detected voltage, the control arithmetic circuit selects one constant-current value table, and controls the power converter circuit based on the constant-current value table selected.
Inventors:
Takafumi Nonaka
Takashi Kumagai
Yuichiro Ito
Kinoshita Haruka
Shinsuke Funayama
Takashi Maeda
Takashi Kumagai
Yuichiro Ito
Kinoshita Haruka
Shinsuke Funayama
Takashi Maeda
Application Number:
JP2011011342A
Publication Date:
September 11, 2013
Filing Date:
January 21, 2011
Export Citation:
Assignee:
Mitsubishi Electric Corporation
Mitsubishi Electric Lighting Co., Ltd.
Mitsubishi Electric Lighting Co., Ltd.
International Classes:
H05B37/02
Domestic Patent References:
| JP2009283281A | ||||
| JP2004158840A | ||||
| JP2004178945A |
Attorney, Agent or Firm:
Shoji Mizoi
Toshio Watanabe
Toshio Watanabe