Circuit for driving a gas discharge lamp load

Details Circuit for driving a gas discharge lamp load Circuit for driving a gas discharge lamp load

1992-05-19

1994-03-08

Argenbright, Tony M.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315307, 315360, 315DIG7, H04B 3702, H04B 3904, H04B 4136

Patent

active

052930998

ABSTRACT:
A circuit (100) for driving an instant-start fluorescent lamp (102) has an inverter (103, 132) and a series-resonant LC oscillator (146, 152). A capacitor (190) begins charging after power-up of the circuit and when its voltage reaches a certain level causes breakdown of a diac (192), which discharges the capacitor into an inverter transistor (132) to trigger operation of the inverter. Re-triggerring of the inverter is prevented by a diode (194) which subsequently discharges the capacitor cyclically, and by a capacitor (186) which enables a transistor (180) at a predetermined time following power-up. The occurrence of a subsequent fault condition causes a capacitor (210) to charge and to enable a transistor (196) which disables the inverter. Charging of the initiating capacitor (190) is prevented by an open circuit between terminal connectors (160, 162) if the lamp is not present.

REFERENCES:
patent: 4477748 (1984-10-01), Grubbs
patent: 5142202 (1992-08-01), Sun et al.
patent: 5179509 (1993-01-01), Ling

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