| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit wherein the lamp currents of two difference kinds of electrode discharge tubes lit in series at a frequency of over 500Hz by using each reference lamp current. SOLUTION: An output oscillated by an oscillation circuit OSC is applied to a coil L1 as the primary winding wire of a transformer TR, a coil L2 as the secondary winding wire of the transformer is connected in series to an electric discharge tube LMP1 and the parallel circuit of a distribution capacitor C2 and the electric discharge tube LMPI and a capacitor C1 as a load current control element are connected to each other. Thus, since the current of a vector sum between the lamp current of the electric discharge tube LMP1 and the current of the distribution capacitor C2 is a lamp current for the LMP1, by the two kinds of electrode discharge tubes having different reference lamp currents, a compact, light-weight and inexpensive serial lighting circuit lit by each reference lamp current is provided. |
