Electronic ballast device for fluorescent lamps

Details Electronic ballast device for fluorescent lamps Electronic ballast device for fluorescent lamps

1990-10-29

1991-09-17

Mis, David

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

315 96, 315219, 315228, 315DIG5, H05B 4126

Patent

active

050497839

ABSTRACT:
In an electronic ballast for at least one fluorescent lamp equipped with heatable electrodes, the heatable electrodes must be adequately preheated before the actual ignition of the fluorescent lamp. Given a high-frequency preheating of the heating electrodes that is usually employed and given the utilization of a frequency shift of the high-frequency of the D.C.-A.C. converter, relatively long preheating times on the order of magnitude of >1.2 second result. In order to be able to significantly reduce the preheating tifme below 1 second, it is proposed that a D.C. path be provided wherein the heating electrtodes are connected in series with the secondary winding at the secondary side of a transformer and to connect this D.C. path to the operating D.C. voltage during the preheating phase via controlled switches.

REFERENCES:
patent: 3710177 (1973-01-01), Ward
patent: 4730147 (1988-03-01), Kroening

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