HIDランプの高周波点灯における放電アーク不安定性の新しい抑制方

抄録

If HID lamps are operated on sinusoidal high frequency power (above 1kHz-), acoustic resonances occur in the discharge tube and arc instabilities are observed. For this reason, high frequency electronic ballasts have not been widely used. If it were possible to operate HID lamps on high frequency power without arc instabilities, one could expect a reduction in weight, size and wattage losses of the ballast. Such electronic ballasts would lead to the wider application of HID lamps. In order to find new methods for the stable operation of HID lamps at high frequency, the authors have first analyzed the instability phenomenon theoretically. They then classified the stable operating methods which had been reported in the past. They then devised a new stable operating method which consisted in changing wavelength in the discharge tube from a progressive wave to a reflected wave. This method can suppress the formation of a standing wave and has not been reported.
norder to find new methods for the stable operation of HID lamps at high frequency, the authors have first analyzed the instability phenomenon theoretically. They then classified the stable operating methods which had been reported in the past. They then devised a new stable operating method which consisted in changing wavelength in the discharge tube from a progressive wave to a reflected wave. This method can suppress the formation of a standing wave and has not been reported.
Next, the authors analyzed and simulated the new stable operating method theoretically and found the best operating condition. By the simulation, it was found that HID lamps can be operated stably at high frequency by changing the wavelength in the ratio of 1.0: 0.4 every cycle. Finally, in a practical experiment, HID lamps were operated under the conditions that had been simulated. The new method permitted operation without acoustic resonances and with greater stability then normal sine wave operation.