Tuned oscillator ballast circuit

Details Tuned oscillator ballast circuit Tuned oscillator ballast circuit

1976-03-19

1977-08-30

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315DIG2, 315DIG5, 315239, 315278, 315205, 315265, 331113A, H05B 3702, H05B 3904, H05B 4136

Patent

active

040457117

ABSTRACT:
A fluorescent lamp ballast circuit includes a tuned oscillator coupled to a pulsed DC potential source and to a transformer having a first winding directly connected to the oscillator and in series connection with a capacitor to form a series resonant circuit. A second winding of the transformer inductively couples the first winding of the transformer to the oscillator, a third winding inductively couples a load across the capacitor of the series resonant circuit, and a fourth winding is inductively coupled to the first winding of the transformer and clamps the DC potential source to a given potential level. Also, protection for open circuits, short circuits, and temperature change due to changed ambient conditions or increased current flow is provided.

REFERENCES:
patent: 3008068 (1961-11-01), Wilting et al.
patent: 3611021 (1971-10-01), Wallace
patent: 3723848 (1973-03-01), Miller
patent: 3753076 (1973-08-01), Zelina
patent: 3754160 (1973-08-01), Jensen
patent: 3758841 (1973-09-01), Bourbeau
patent: 3769545 (1973-10-01), Crane
patent: 3889153 (1975-06-01), Pierce

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