Ballast protecting device

Details Ballast protecting device Ballast protecting device

2011-01-18

2011-01-18

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Reexamination Certificate

active

07872426

ABSTRACT:
A ballast protecting device is connected between an AC input voltage and a ballasted lamp. The device includes a voltage sensing block, a current sensing block, a pulse forming block, a switch block, and a micro-controller unit (MCU). The pulse forming block converts positive half cycles of the voltage and current provided by the voltage and current sensing blocks to square wave pulses, and the MCU performs a phase angle comparison between generated pulses. Upon lamp malfunction, ballast current is phase shifted. Current may also be phase shifted when there is a radical change in the input voltage. As a trend of the phase shift between current and voltage is determined by the MCU, a ballast disconnect decision is made, and the MCU actuates the switch block to disconnect the connected ballast and malfunctioning lamp.

REFERENCES:
patent: 5452173 (1995-09-01), Brannon et al.
patent: 5521491 (1996-05-01), Najam
patent: 6191568 (2001-02-01), Poletti
patent: 6326740 (2001-12-01), Chang et al.
patent: 6534933 (2003-03-01), Shen
patent: 6661185 (2003-12-01), Kominami et al.
PCT International Search Report (ISR) for PCT/US2004/34097 mailed Aug. 29, 2005.

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