2003 Volume 123 Issue 3 Pages 294-300
Novel electric ballast for HID lamps which can not only supply the stable discharge current but also generate high voltage for initiate its restarting instantaneously is presented. On the restarting process of the HID lamps, the discharging starts at a glow-discharge and changes to stable arc-discharge. However, it is necessary to inject adequate voltage onto the HID lamp depending upon the previous discharging condition. The immittance-conversion elements, which are composed of a coaxial cables, are applied in order to realize above mentioned requirements. Furthermore, multi pulse injection method is presented for quick restarting of the HID lamps. The effectiveness of the proposed circuit is verified through the experimental results on the experimental setup for 75W HID lamp.