Means for limiting and controlling the current of a discharge la

Details Means for limiting and controlling the current of a discharge la Means for limiting and controlling the current of a discharge la

1982-09-20

1985-01-08

Moore, David K.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315224, G02B 960

Patent

active

044928971

ABSTRACT:
A means for limiting and regulating the current of a discharge lamp. The problem is in particular making the power control of a thin fluorescent lamp easy to manage and in a universally applicable manner. The starting point chosen for the solving of this problem is a conventional supply voltage regulator, for instance one which when the luminous power is controlled clips part of the leading or trailing front of the supply voltage wave. Between such a control (1) and the lamp (8) has been connected an electronic ballast means (7) having after a filtering circuit (L,C1,C2) and a rectifier (5), a high frequency oscillator consisting of two series-connected transistors (V6, V5), a transformer (T1) connected betweem them, a choke (L1,L2) connected in series with the transformer's primary winding, and a capacitor (C6,C7) in the last-mentioned series circuit between the lamp and the current source. Moreover, between one pair of terminals of the lamp's filaments and in parallel with the lamp has been connected a capacitor (C8,C9), which during ignition determines the operating frequency and the voltage and which furthermore causes the filament heating power to increase with decreasing lamp current.

REFERENCES:
patent: 4234822 (1980-11-01), Garrison et al.
patent: 4240009 (1980-12-01), Paul
patent: 4392087 (1983-07-01), Zansky

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