H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/55
H05B 41/26 (2006.01) H01F 27/255 (2006.01) H01F 38/02 (2006.01) H01F 38/10 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1039795
TITLE OF THE INVENTION: DISCHARGE LAMP LIGHTING APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE: In the present discharge lamp lighting apparatus there are combined for cooperation three oscillation circuits. The first oscillation circuit has a power source, a linear inductor and a capacitor connected in series. The second oscillation circuit is connected across said capacitor and has a bounce or back swing booster inductor and a voltage response switching element connected in series. The third oscillation circuit comprises the bounce booster inductor and its distributed capacity. A dis- charge lamp is connected across the capacitor. The first, second and third oscillation circuits generate a high oscillation vol- tage across the capacitor for starting the discharge lamp. The bounce booster inductor comprises a magnetic core and a coil wound around the magnetic core. The quality of material and the shape of the magnetic core are so chosen that, when the break- down current of the switching element is applied thereto, its inductance lu in a non-saturated state, is increased rapidly. By "breakdown current" of a switching element is meant the value of the current immediately after the state of conduction where a thyristor type voltage-current characteristic is involved. To achieve said rapid inductance increase, the core factor K is made small the effective permeability µe is made large, "lu" is determined as lu = 4?Kµe?N2 x 10-9 (Henry), wherein N indicates the number of turns of the coil windings. The core factor K = K1 + K2 wherein K1 represents the coiled part and is made larger than that K2 representing the non-coiled part that is, the cross-sectional area of the coiled part is made smaller than that of the non-coiled part to achieve a small core factor K = K1 + K2 = li/Ai where in Ai shows the cross-sectional area of the individual part of the core and li shows the length of the magnetic path corresponding to Ai. The effective per- meability is determined relative to the initial permeability leakage current and ambient temperature. However, the quality of material of the core which has the first peak of permeabi- lity in the range of a low temperature from -40°C to +10°C and an abrupt saturation characteristic, is used to make the effective permeability at a low temperature higher than that at the normal temperature. In addition, the core is provided with a small gap to improve the starting operation of the dis- charge lamp at a high temperature.
208905
Nec Sylvania Corporation
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