Drive device for light emitting diode element, light source...

Details Drive device for light emitting diode element, light source... Drive device for light emitting diode element, light source...

2007-05-30

2009-02-24

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C345S102000, C345S082000

Reexamination Certificate

active

07495397

ABSTRACT:
A drive device for a light emitting diode element comprises a light emitting diode element circuit part configured to be formed by connecting at least one light emitting diode element based on a predetermined connection form, a power supply unit configured to generate a direct-current (DC) supply voltage for driving the light emitting diode element of the light emitting diode element circuit part for light emission of the light emitting diode element, and apply the DC supply voltage to the light emitting diode element circuit part, a power-supply application on/off unit configured to be provided to turn on/off application of the DC supply voltage to the light emitting diode element circuit part, and a current control circuit part configured to be caused to switch its operation so as to carry out constant current operation if application of the DC supply voltage is in an on-state and carry out voltage keeping operation if application of the DC supply voltage is in an off-state.

REFERENCES:
patent: 6534924 (2003-03-01), Oguchi et al.
patent: 7002547 (2006-02-01), Yamada
patent: 7235954 (2007-06-01), Murakami
patent: 7312783 (2007-12-01), Oyama
patent: 2005/0231459 (2005-10-01), Furukawa
patent: 2006/0082538 (2006-04-01), Oyama
patent: 2001-210122 (2001-08-01), None

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