| 摘要 |
<p>TITLE OF THE INVENTION: DISCHARGE LAMP LIGHTING APPARATUS AND METHOD 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 discharge lamp is connected across the capacitor. The first, second and third oscillation circuits generate a high oscillation voltage 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 breakdown 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 .mu.e is made large, "lu" is determined as lu = 4?K.mu.e?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 permeability 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 permeability in the range of a low temperature from -40.degree.C to +10.degree.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 discharge lamp at a high temperature.</p> |
