Electric lamp and discharge devices: systems – High frequency starting operation for fluorescent lamp
Patent
1998-03-31
1999-10-12
Yu, David H.
Electric lamp and discharge devices: systems
High frequency starting operation for fluorescent lamp
315209R, 315244, H05B 3702
Patent
active
059659858
ABSTRACT:
A dimmable ballast circuit for a gas discharge lamp comprises a resonant load circuit with a resonant inductance, a resonant capacitance and circuitry for connecting to a gas discharge lamp. A d.c.-to-a.c. converter circuit is coupled to the resonant load circuit for inducing a.c. current therein, and comprises a pair of switches serially connected between a bus conductor at a d.c. voltage and a reference conductor. The voltage between a reference node and a control node of each switch determines the conduction state of the associated switch. The respective reference nodes of the switches are interconnected at a common node through which the a.c. current flows, and the respective control nodes of the switches are substantially directly interconnected. A gate drive arrangement for regeneratively controlling the switches comprises a driving inductor connected between the common node and the control nodes and mutually coupled to the resonant inductor for sensing current therein. A second inductor is serially connected to the driving inductor, and together with the driving inductor is connected between the common node and the control nodes. A clamping circuit limits the voltage across the second inductor to achieve desired lamp output, and includes a control winding mutually coupled to the second inductor. A control circuit controls voltage across the control winding in response to an error signal representing difference between a user-selectable set point signal and a feedback signal representing a time-averaged value of a lamp operating parameter.
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General Electric Company
Yu David H.
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