1995 年 115 巻 11 号 p. 1062-1071
Concerning the operating circuit for high pressure mercury arc lamp, the authors propose a in-phase type operating circuit through which current, nearly sinusoidal, runs with power factor, close to 100%. We connect by-pass circuit to the tap at the point near power source side, using ballast with larger self-inductance than self-inductance L of ballast winding of operating circuit without by-pass circuit. It is shown that in-phase type operating circuit, through which sinusoidal current runs in power source side with power factor of 100%, is realizable, by fixing the circuit constant with self-inductance L, self-inductance of choke coil of by-pass circuit Lb and condenser capacity Cb at reasonable value.
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