H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/44
H05B 41/38 (2006.01) H05B 41/392 (2006.01) H05B 41/42 (2006.01)
Patent
CA 1208693
14 ABSTRACT: The invention relates to a dimming circuit for a discharge lamp (5) which is arranged in series with two electric coils (3, 4), one of which is by-passed by a semiconductor switching element (6). In accordance with the invention t the control circuit of the semiconductor switching element (6) is formed by a series arrangement of a resistor (15) and a capacitor (16), the series arrange- ment connecting a main electrode to the control electrode of that semiconductor switching element (6). The induc- tance of the by-passed coil (3) is chosen such that the semiconductor switching element (6) is made conductive on reignition of the lamp. The electric losses of the dimming arrangement are low.
414846
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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