Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2005-11-18
2009-12-01
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S225000, C315S247000, C315S2090SC, C315S291000
Reexamination Certificate
active
07626341
ABSTRACT:
A discharge lamp lighting apparatus includes an input power supply, a power supply circuit, a bridge circuit having switching elements that performs AC operation of a discharge lamp, a lighting circuit, a control circuit that controls the power supply circuit, and a drive circuit that drives bridge circuit. An overcurrent suppressing circuit having a resistance element and a switching element connected to the resistance element in parallel therewith is connected between the negative side of the bridge circuit and the negative side of the power supply circuit, so that the overcurrent suppressing circuit automatically adjusts current flowing to the switching elements and suppresses the overcurrent upon starting the discharge lamp.
REFERENCES:
patent: 7239089 (2007-07-01), Suzuki et al.
patent: 7518319 (2009-04-01), Konno et al.
patent: A 5-152088 (1993-06-01), None
patent: A 9-322548 (1997-12-01), None
patent: B2 3258758 (2001-12-01), None
patent: A 2005-5185 (2005-01-01), None
Minebea Co. Ltd.
Oliff & Berridg,e PLC
Vo Tuyet
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