Ferroresonant transformer ballast for maintaining the current of gas discharge lamps at a predetermined value
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
May 30, 1997
filing date -
May 30, 1997
priority date (Note) -
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Abstract
A ferroresonant ballast for regulating the current level of gas discharge lamps includes a magnetic core for supporting coil windings. A first or input coil is wound about the magnetic core for supplying a changing input voltage. A second or capacitor coil is wound about the magnetic core and is induced by the first coil to generate an output voltage across an output or resonant capacitor. A third or lamp coil is wound about the magnetic core and coupled to a gas discharge lamp which is regulated at a constant voltage in response to the voltage generated across the output capacitor. The ferroresonant ballast may include a control circuit and inductor that is switchable coupled to the output capacitor for simulating core saturation.
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