Circuit arrangement for electrode pre-heating of a fluorescent l

Details Circuit arrangement for electrode pre-heating of a fluorescent l Circuit arrangement for electrode pre-heating of a fluorescent l

1996-06-10

1998-12-29

Pascal, Robert

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315DIG5, 315102, 315107, H05B 4136

Patent

active

058545387

ABSTRACT:
A circuit arrangement used with electronic ballast equipment has an inverter which supplies a high-frequency half-bridge voltage to at least one load circuit having a lamp throttle, a fluorescent lamp, an ignition capacitor, and a half-bridge capacitor. In order to pre-heat the coils of the fluorescent lamp in a short period of time, a switchable voltage source is activated. This voltage source is connected to the output of the inverter. The outputs of the voltage source are constructed as a pair, to which the electrodes and the fluorescent lamp are connected in parallel. This voltage source includes a transformer having a primary winding coupled to the inverter and is switched between non-conducting and conducting (energized) states by a switching stage. The secondary windings of the transformer are connected in parallel to the electrodes of the fluorescent lamp.

REFERENCES:
patent: 3872350 (1975-03-01), Powell et al.
patent: 4682080 (1987-07-01), Ogawa et al.
patent: 4965493 (1990-10-01), Van Meurs et al.
patent: 5049783 (1991-09-01), Kroening
patent: 5656891 (1997-08-01), Luger et al.

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