LIGHTING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a lighting system making the noises hardly leaking from a discharge lamp lighting device to the outside even when the temperature rises in a common mode choke at lighting a discharge lamp on by quantitatively clarifying a relationship between a resonance frequency and an operating frequency for preventing the magnetic saturation of the common mode choke. SOLUTION: The lighting system comprises the discharge lamp lighting device 4 having a printed board 1 on which electronic parts are mounted and a conductive case (a case body 2 and a case cover 3) storing the printed board 1 and connected to the discharge lamp 6 via a lead 5, and a conductive luminaire 9 (a luminaire body 7 and a reflecting plate 8) storing the discharge lamp lighting device 4. The operating frequency f of an inverter circuit is√2 to 1/√2 times the resonance frequency f0 of a LC resonance circuit which consists of an inductor L of the common mode choke and a floating capacitance C formed in an electrical closed loop including the common mode choke. COPYRIGHT: (C)2003,JPO