Ballast with relamping circuitry

Details Ballast with relamping circuitry Ballast with relamping circuitry

2007-02-27

2007-02-27

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural load device systems

C315S105000, C315S224000, C315S276000, C315S308000, C315S309000

Reexamination Certificate

active

11172066

ABSTRACT:
An apparatus for detecting the reconnection of a lamp filament to an electronic ballast driving a fluorescent lamp. A control circuit controls an inverter circuit to providing power to a filament control circuit. The filament control circuit preheats and powers the lamp filament of the one or more lamps. A pulse generator generates an input signal as a function of the number of lamp filament connected to the filament control circuit. A current sensor generates a first voltage indicative of whether a lamp filament has been reconnected to the circuit. A peak detector generates a peak voltage signal when the first voltage indicates a reconnection of a lamp filament has occurred. A sensing circuit generates a command signal to provide to the control circuit to supply power to the filament control circuit to preheat and power the lamp when the peak detector generates the peak voltage signal.

REFERENCES:
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patent: 5770925 (1998-06-01), Konopka et al.
patent: 5883473 (1999-03-01), Li et al.

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