DC/AC converter with improved starter circuit

Details DC/AC converter with improved starter circuit DC/AC converter with improved starter circuit

1998-05-04

1999-10-05

Vu, David H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315276, 315DIG2, 315DIG5, H05B 3702

Patent

active

059629851

ABSTRACT:
A circuit arrangement for operating a discharge lamp comprises a self-oscillating DC/AC converter (II) provided with a series arrangement of a first and a second switching element between a first and a second input terminal (2, 2') for connection to a DC voltage source (III). The series arrangement supplies an alternating current Ib to a load branch having output terminals for connection of the discharge lamp during nominal operation. The circuit arrangement is in addition provided with a starter circuit ST for generating a DC voltage component between the control electrode (1c') and the main electrode (1a') of the second switching element (1'). The starter circuit also include apparatus which comprise an auxiliary switch (25) that brings the first switching element (1) into a conducting state if the amplitude of the alternating current Ib is low compared with its amplitude during nominal operation. This apparatus prevents damage to the switching elements and promotes the initiation of the nominal operational state.

REFERENCES:
patent: 4748383 (1988-05-01), Houkes

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