Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation
Reexamination Certificate
2011-01-11
2011-01-11
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural load device regulation
C315S307000, C315SDIG002
Reexamination Certificate
active
07868561
ABSTRACT:
A dimmer switch for controlling the intensity of a dimmable screw-in compact fluorescent lamp provides smooth dimming of the fluorescent lamp and prevents flickering of the lamp due to multiple re-strikes. The dimmer switch prevents multiple re-strikes by avoiding multiple firings of a controllably conductive switching device of the dimmer circuit by limiting the high-end light intensity of the fluorescent lamp. Specifically, the dimmer switch limits the length of a conduction interval of the controllably conductive switching device to less than approximately 75% of each half-cycle. The dimmer switch may include a user-accessible adjustment actuator for changing the dimmer switch between an incandescent operating mode and a screw-in compact fluorescent mode. The dimmer switch may also be operable to automatically change the dimmer switch between the incandescent operating mode and the screw-in compact fluorescent mode by detecting the occurrence of the multiple firings of the controllably conductive switching device.
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Description of MAESTRO® Dimmer Model MALV-600 product of assignee Lutron Electronics Co. Inc. shown at p. 62 of Lutron's 2006 catalog. The product employs a fault detection technique which is described in the attached 8 page description and circuit diagram. Applicant will gladly answer any question the Examiner cares to raise regarding the details of the circuit diagram of the device or the attached description of its operation.
Taipale Mark S.
Weightman Russell
Chen Jianzi
Lutron Electronics Co. Inc.
Ostrolenk Faber LLP
Owens Douglas W
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