Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2010-07-13
2011-11-15
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S2090SC, C315S362000
Reexamination Certificate
active
08058821
ABSTRACT:
A control circuit of a DC/DC converter is provided for supplying a driving voltage to a light emitting element. A hysteresis comparator compares a detection voltage that corresponds to the output voltage of the DC/DC converter with two threshold voltages. If the detection voltage is smaller than the lower threshold voltage, the hysteresis comparator outputs a comparison signal at the low level. Otherwise, the comparison signal is set to the high level. The switching control unit uses the comparison signal as a reference. The switching control unit instructs the switching transistor of the DC/DC converter to perform the switching operation during a period when the comparison signal is at the low level. Otherwise, the switching operation is suspended. The control circuit inhibits light emission of the light emitting element during a period when the comparison signal is at the low level. Otherwise, the control circuit permits the light emission.
REFERENCES:
patent: 5696431 (1997-12-01), Giannopoulos et al.
patent: 5977725 (1999-11-01), Miyazaki et al.
patent: 6153987 (2000-11-01), Toda et al.
patent: 6445141 (2002-09-01), Kastner et al.
patent: 6617808 (2003-09-01), Ito et al.
patent: 6628093 (2003-09-01), Stevens
patent: 6946807 (2005-09-01), Okamoto et al.
patent: 7411360 (2008-08-01), Henry
patent: 7414371 (2008-08-01), Choi et al.
patent: 7557517 (2009-07-01), Jin
patent: 2003/0117084 (2003-06-01), Stack
patent: 2006/0028148 (2006-02-01), Ichikawa et al.
patent: 2007/0013323 (2007-01-01), De Oto
patent: 84-89380 (1989-04-01), None
patent: 2002-169201 (2002-06-01), None
patent: 2004-201474 (2004-07-01), None
patent: 2005-73483 (2005-03-01), None
patent: 2005-130602 (2005-05-01), None
patent: 2005-338257 (2005-12-01), None
patent: 2004/100614 (2004-11-01), None
Form PTO-892 from Office Action for U.S. Appl. No. 12/062,756 dated Jan. 14, 2010.
Notification of Reason(s) for Refusal for Patent Application No. 2005-356071 with English translation dispatched Jan. 25, 2011.
Japanese Office Action, Notification of Reason(s) for Refusal for Japanese Patent Application No. 2005-356071 with English Translation dispatched May 17, 2011.
Tamegai Yoichi
Yamamoto Isao
Cantor & Colburn LLP
Le Tung X
Owens Douglas W
Rohm & Co., Ltd.
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