Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2006-01-18
2010-02-23
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S297000, C315S2090SC, C315SDIG002, C345S102000, C345S213000, C345S690000, C345S087000
Reexamination Certificate
active
07667415
ABSTRACT:
A PWM generation circuit is set so as to generate a PWM pulse signal having a frequency that is an odd number times a vertical synchronization frequency. A frequency division circuit frequency-divides the PWM pulse signal generated by the PWM generation circuit. An AND gate calculates the logical product of the PWM pulse signal generated by the PWM generation circuit and a frequency-division pulse signal outputted from the frequency division circuit. An OR gate calculates the logical sum of the PWM pulse signal generated by the PWM generation circuit and the frequency-division pulse signal outputted from the frequency division circuit. A selector outputs an output signal of the OR gate as a dimming pulse signal in a case where the set duty ratio is not less than 50%, while outputting an output signal of the AND gate as a dimming pulse signal in a case where the set duty ratio is less than 50%. Consequently, the frequency of the dimming pulse signal is five-second the frequency of a vertical synchronizing signal.
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English language Abstract of JP 11-297485.
English language Abstract of JP 6-243987.
English language Abstract of JP 11-126696.
English language Abstract of JP 7-325286.
Hatano Takahisa
Suzuki Kosho
Greenblum & Bernstein P.L.C.
Panasonic Corporation
Philogene Haissa
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