Shielded starting coil for an electrodeless high intensity disch

Details Shielded starting coil for an electrodeless high intensity disch Shielded starting coil for an electrodeless high intensity disch

1990-06-24

1992-04-21

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, 313234, H05B 4116

Patent

active

051071851

ABSTRACT:
A passive, resonant starting circuit for an electrodeless HID lamp includes a starting coil that is shielded from stray capacitances that would otherwise result in detuning the resonant circuit and hence decreasing efficiency. The starting circuit further includes a capacitance coupled in series with the starting coil and another capacitance coupled in parallel with the coil. In a preferred embodiment, the starting coil is enclosed in a conductive cylindrical housing which functions as both a shield from external capacitances and the resonant capacitance in parallel with the starting coil. The housing has a lengthwise gap in order to prevent the housing from acting as a short circuit secondary with respect to the starting coil. A conductive disk is mounted to the ground end of the housing to increase shielding even further. The parallel resonant capacitance is determined by the length of the housing and the distance between the coil and the housing.

REFERENCES:
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4894589 (1990-01-01), Borowiec
patent: 4894590 (1990-01-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4972120 (1990-11-01), Witting

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