Electrical circuit for operating a fluorescent lamp and for meas

Details Electrical circuit for operating a fluorescent lamp and for meas Electrical circuit for operating a fluorescent lamp and for meas

1993-09-23

1996-04-02

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315239, 315244, 315226, 315291, 315 94, 315DIG2, H05B 4116

Patent

active

055043992

ABSTRACT:
In an electrical circuit for feeding a fluorescent lamp, a serial resonant circuit is comprised of a first coil of a feedback-transformer, a resonant inductor, a coupling condenser, a first lamp cathode, a resonant condenser, and a first coil of an isolating transformer, this serial resonant circuit being connected between the output of an inverted rectifier, connected to a voltage supply source and one terminal of said voltage supply source, with a second coil of the isolating transformer being connected in parallel with the second lamp cathode. If the coils of the isolating transformer have the same number of loops, this connection of the second lamp cathode ensures that the same heating current will flow through both lamp cathodes, so that these will be heated equally. The parallel circuit of the second lamp cathode with the second coil of the isolating transformer is connected through a resistance with a terminal of the supply voltage. The lamp current flows through this resistor, thus the voltage across the resistor is proportional to the actual current of the lamp and it can therefore be transmitted to the main circuit which regulates the lamp current.

REFERENCES:
patent: 4017761 (1977-04-01), Woldring
patent: 4399391 (1983-08-01), Hammer et al.
patent: 4553071 (1985-11-01), Boyd
patent: 4959591 (1990-09-01), Hirschmann
patent: 4988920 (1991-01-01), Hoeksma
patent: 5192896 (1993-03-01), Qin

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