H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/00 (2006.01) H05B 41/282 (2006.01)
Patent
CA 2469575
The present invention relates to a drive circuit for operating at least one lamp La in an associated load circuit, in which the terminals for the at least one lamp are arranged, having two switches (S1, S2) in a half-bridge arrangement, each switch (S1, S2) comprising a cascode circuit of a bipolar transistor (B2) having a control, a working and a reference electrode, and a field-effect transistor (F2) having a control, a working and a reference electrode, the center point of the half-bridge arrangement being coupled to the at least one load circuit, and each cascode circuit of this type having an input circuit (E1, E2), in which a diode (D21) and a secondary winding (L2) of a transformer, connected in series, are arranged in parallel with the control electrode of the bipolar transistor (B2) and the reference electrode of the field-effect transistor (F2), the primary winding (L0) of said transformer being arranged in the load circuit such that the load circuit current (I L) flows through it when operating the at least one lamp (La).
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Smart & Biggar
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