Integrated circuit for use in a ballast circuit for a gas discha

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition

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315205, 315DIG5, 315219, 315225, H05B 3702

Patent

active

059864109

ABSTRACT:
Disclosed is an integrated circuit for use in a ballast circuit for supplying a.c. current to a resonant load circuit incorporating a gas discharge lamp and a resonant inductance and capacitance. The integrated circuit comprises a d.c.-to-a.c. converter circuit comprising first and second switches serially connected between a bus pin, for connection to a bus conductor at a d.c. voltage, and a reference pin, for connection to a reference conductor. The switches are connected together at a node connected to a common pin through which the a.c. current flows, have respective control nodes connected to a control pin, and have respective reference nodes. The voltage between the control pin and an associated reference node determines the conduction state of the associated switch. A first embodiment also includes first and second resistors serially connected between the bus and reference pins, with their intermediate node connected to an intermediate pin. A voltage-breakover (VBO) device is effectively connected between the common pin and the intermediate pin, for supplying a starting pulse for starting the ballast circuit. A third resistor is connected between the common pin and one of the bus pin and the reference pin, to set the initial polarity of starting pulse to be generated upon firing of the VBO device. A second embodiment also includes first and second resistors serially connected between the bus and reference pins, with their intermediate node connected to the control pin. A third resistor is connected between the common pin and one of the bus pin and the reference pin.

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Copending application, serial No. 08/709,064, filed on Jun. 12, 1998 as a continuation of application serial No. 08/709,064, filed on Sep. 6, 1996, including specification & drawings marked with attorney docket No. LD 10980, Amendment dated Jan. 9, 1998, and Preliminary Amendment dated Jun. 12, 1998.
Copending application, serial No. 08/897,345, filed on Jul. 21, 1997 as a continuation-in-part of application serial No. 08/794,071, filed on Feb. 4, 1997, including specification & drawings marked with attorney docket No. LD 10980, Amendment dated Jan. 21, 1998, Preliminary Amendment dated Jul. 21, 1997, and Amendment dated Jul. 6, 1998.

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