The Consideration of In-Phase Type Operating Circuit for High-Pressure Mercury Arc Lamp

Abstract

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 L_b and condenser capacity C_b at reasonable value.