This paper is concerned with the design and the electrical characteristics of the leakage auto-transformer type constant wattage ballasts for the high pressure mercury lamps.At first investigation, the necessary electric circuit constants for designing, such as, turns ratio, required leakage reactances, magnetizing currents, are derived from the equivalent circuit for the leakage auto-transformers by the use of the equivalent sine-wave analysis. And then, the circuit constants and electrical characteristics of the ballasts are calculated in a particular specification with the aid of the computer, and the quantitative relations between those constants are discussed.
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