Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-02-14
2009-10-20
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S276000, C315S307000, C363S021020, C363S041000, C363S123000
Reexamination Certificate
active
07605546
ABSTRACT:
A discharge lamp lighting apparatus includes a triangular signal oscillator, a first control part to compare the triangular signal with an error voltage between a reference voltage and a voltage corresponding to a first current passed through a secondary winding of a transformer and generate a first PWM control signal for turning on/off switching elements Qp1and Qn1with a phase difference of about 180 degrees and a pulse width corresponding to the first current, and a second control part to compare the triangular signal with an error voltage between a reference voltage and a voltage corresponding to a second current passed through a secondary winding S2of a transformer T2and turn on/off switching elements Qp2and Qn2in synchronization with the first PWM control signal with a phase difference of about 180 degrees and a pulse width corresponding to the second current.
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U.S. Appl. No. 12/391,594, filed Feb. 24, 2009, Kimura.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Owens Douglas W
Sanken Electric Co. Ltd.
Vu Jimmy T
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