Ferroresonant transformer ballast for maintaining the current of

Details Ferroresonant transformer ballast for maintaining the current of Ferroresonant transformer ballast for maintaining the current of

1997-05-30

1999-08-17

Shingleton, Michael B

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315291, 315307, 315308, H05B 3702

Patent

active

059398388

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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patent: 5216333 (1993-06-01), Wucholls
patent: 5539300 (1996-07-01), Mathieu

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