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Megahertz operation of voltage-fed inverter for HID lamps using distributed constant line

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6 Author(s)
Ohsato, M.H. ; Dept. of Electr. Eng., Tokyo Metropolitan Univ., Japan ; Mao, Q. ; Ohguchi, H. ; Shimizu, T.
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A novel type of solid-state ballast, which operates in the megahertz-range frequency, is presented in this paper. A circuit composed of a voltage-fed half-bridge inverter, a distributed constant line, and a parallel LC resonant circuit has been developed for this purpose. The high-intensity discharge (HID) lamp is connected to the output terminal of the inverter through the distributed constant line. Here, since the length of the line is adjusted to 1/4 of the propagation wavelength λ, the output voltage of the voltage-fed inverter can be converted to a current source on the load side. Based on the experiment results, the ballast appears to be able to supply not only high voltage, but also constant current for ignition of the HID lamp. The experimental results from a prototype system are used to verify the theoretical procedure

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Industry Applications, IEEE Transactions on  (Volume:34 ,  Issue: 4 )