Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1993-02-18
1994-08-23
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315209R, 315DIG7, H05B 3702
Patent
active
053410688
ABSTRACT:
A compact fluorescent lamp having an electronic ballast circuit arrangement which exhibits improved thermal management characteristics includes an input conditioning circuit which performs rectification and optionally, power factor correction of a standard power line current. The output of the conditioning circuit is coupled to a high frequency switching circuit which includes a pair of power MOSFET switching devices operated alternately between an on and an off condition in response to a control signal presented to the respective gate terminals thereof. The gate control signal is developed by sampling the load current and generating a speed-up pulse which, by being transformer coupled to the gate terminals, functions as the gate control signal. The gate control signal is of a duration to allow high frequency operation of the lamp without generating EMI in a compliance band between 400 kHz and 30 mHz and further, without subjecting the switching devices to dynamic loss conditions that could result in a thermal runaway condition.
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Application Note AN-973 entitled: "HEXFETs Improve Efficiency, Expand Life Of Electronic Lighting Ballasts" by Peter N. Wood of International Rectifier.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Shingleton Michael B.
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