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Abstract

An electronic ballast for high intensity discharge lamps is taught. A high speed electronic switch gates voltage across the lamp only for that period of time when the amount of resultant current flow will not adversely affect the lamp or the switch. At that point, the voltage is gated off for a period of time, after which the cycle repeats. This scheme eliminates the need for any inductive, resistive or capactive element, either saturable or conventional, in the post-ignition operation of the lamp, except perhaps for auxiliary functions. The elimination of such inductive elements results in a highly efficient, low cost electronic ballast having reduced electromagnetic and radio interference emissions.

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First Claim