Electric arrangement for igniting and supplying a gas discharge

Details Electric arrangement for igniting and supplying a gas discharge Electric arrangement for igniting and supplying a gas discharge

1988-09-29

1990-10-23

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315240, 315DIG5, H05B 3702

Patent

active

049654934

ABSTRACT:
An electric arrangement for igniting and supplying a gas discharge lamp (13) has two input terminals (1, 2) intended to be connected to an AC power supply source. The output terminals of a rectifier bridge (4, 5, 6, 7) are connected in the operative state of the lamp to a DC/AC converter having two input terminals (A, B), one terminal (A) of which is connected to the other terminal (B) at least via a series arrangement of a first semiconductor switching element (9) and a load circuit comprising at least an induction coil (10) and the discharge lamp (13) as well as a capacitor (15). The load circuit and capacitor are shunted by a circuit comprising a second semiconductor switching element (16) and a parallel arrangement of a third semiconductor switching element (18) and a diode (17). The first two semiconductor switching elements are shunted by a buffer capacitor (8). The third semiconductor switching element (18) includes a control circuit which makes the third switching element conduct for a given period at the start of each period of the high-frequency cycle of the converter.

REFERENCES:
patent: 4525648 (1985-06-01), DeBijl et al.

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