The Operating Circuits with a Common By-pass Circuit for Multiple High-pressure Mercury Discharge Lamp

Characteristics of Circuit during Start-up and When a Lamp does not Light

Abstract

Usillg both simulation and experiments, we investigated cause to ensure that the supply currellt in an electrical circuit with a common by-pass circuit can be kept approximately constant from start-up to reachillg steady state. In such circuit, the supply current can be distorted by about 2% when the power factor reaches 100%. We found that an approximately constant supply current can be achieved, thus making these circuits practical for usewith multiple high-pressure mercury discharge lamps, even when a larnp does not light.