H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/54
H05B 41/298 (2006.01)
Patent
CA 1225693
PHN. 10.337 12 ABSTRACT: The invention relates to a DC/AC converter provided with two transistors (11 and 20), the current through an inductively stabilized discharge lamp (16, 15) to be connected to the converter alternately flow- ing through one and the other transistor According to the invention, the lamp (15) has connected in series with it a primary winding (12) of a current transformer, a secondary winding (30, 31) of this transformer being connected to a timing circuit (32 to 35; 32' to 35' ) of a control device of the transistors. The timing circuit is provided with voltage-dependent elements, i.e. Zener diodes (35, 35') The combination of the current trans- former and the Zener diodes causes the frequency of the converter during starting of the lamp (15) to be larger than during the operating condition of this lamp. As a result, it is avoided that this lamp ignites at too cold electrodes.
426339
de Bijl Adrianus M.j.
Melai Henri A.i.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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