HIGH VOLTAGE DISCHARGING LAMP LIGHTING DEVICE AND OVERCURRENT SUPPRESSING METHOD OF BOOSTER/STEP-DOWN INVERTER AS WELL AS HIGH VOLTAGE DISCHARGING LAMP LIGHTING DEVICE

摘要

PPROBLEM TO BE SOLVED: To permit the securing of an inductance capable of limiting a current by a coil L, and the suppression of breakage of a high voltage discharging lamp lighting device, even when a load (discharging lamp) is short-circuited and overcurrent is made to flow whereby the magnetic saturation of the coil L is generated. PSOLUTION: The high voltage discharging lamp lighting device is provided with: a power supplying unit having a booster/step-down inverter for supplying a power to the high voltage discharging lamp, and controlling an output so as to conduct a specified current into the high voltage discharging lamp; an initiating pulse generating circuit for supplying an initiating high voltage to the high voltage discharging lamp; and a control circuit for controlling the power supplying unit as well as the initiating pulse generating circuit. In such a high voltage discharging lamp lighting device, the booster/step-down inverter is provided with coils having elements as follows: (a) a bobbin having a core inserting hole at the central part thereof and a coil receiving part at the outside thereof; (b) a coil wound around the coil receiving part, and provided with the number of winding which is larger than that in a case of constituting a closed magnetic circuit; and (c) an open type core provided in a part of the magnetic circuit formed around the core inserting hole and the coil. PCOPYRIGHT: (C)2006,JPO&NCIPI