Drive circuit for operating at least one lamp in an...

Details Drive circuit for operating at least one lamp in an... Drive circuit for operating at least one lamp in an...

2006-06-06

2006-06-06

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000, C363S037000

Reexamination Certificate

active

07057355

ABSTRACT:
Drive circuit for operating at least one lamp in an associated load circuit, in which terminals for the lamp are arranged, having two switches in a half-bridge arrangement, each switch including a cascode circuit of a bipolar transistor having a control, a working and a reference electrode, and a field-effect transistor having a control, a working and a reference electrode. The center point of the half-bridge arrangement is coupled to the load circuit, and each cascode circuit has an input circuit, in which a diode and a secondary winding of a transformer, connected in series, are arranged in parallel with the control electrode of the bipolar transistor and the reference electrode of the field-effect transistor, the primary winding of the transformer being arranged in the load circuit such that the load circuit current flows through it when operating the lamp.

REFERENCES:
patent: 4894587 (1990-01-01), Jungreis et al.
patent: 5475285 (1995-12-01), Konopka
patent: 5777861 (1998-07-01), Shimizu et al.
patent: 6078144 (2000-06-01), Twardzik
patent: 2004/0012345 (2004-01-01), Busse et al.
patent: 0261018 (1988-03-01), None
patent: 0753987 (1997-01-01), None
patent: 0936845 (1999-08-01), None
Search Report from European Patent Office (for related foreign application) referencing the above-listed patent documents, dated Dec. 2, 2005 (3 pages total).

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