Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2005-03-01
2005-03-01
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S2090SC
Reexamination Certificate
active
06861811
ABSTRACT:
The invention concerns a circuit arrangement for igniting and operating an electrodeless gas discharge lamp by means of a high operating frequency drive voltage, comprising a half-bridge commutator having two switching elements each having an emitter electrode and a control electrode. The said switching elements are alternately switched to a conducting state by means of a resonant control circuit, which is coupled to an oscillator via a transformer. The said resonant control circuit comprises capacitor means forming part of said oscillator and a driver stage driven by an oscillator, the driver being of the class-E type. A DC supply voltage is supplied to the driver via a current-limiting circuit. The amplitude of the high frequency drive voltage is substantially constant in a chosen frequency range.
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Data Sheet for HEF4046B Phase Locked Loop, Philips Semiconductors, Jan. 1995.
Koninklijke Philips Electronics , N.V.
Lee Wilson
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