Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1988-08-05
1990-02-27
Mis, David
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315307, 315DIG7, H05B 4136
Patent
active
049049054
ABSTRACT:
An apparatus for starting and operating an arc lamp used in health care applications includes means for producing a rectangular wave AC signal with a frequency controlled by external resistive and capacitive networks. Parallel-connected inductor and capacitor means form a resonant circuit to receive the rectangular wave AC signal. Additional capacitor means connected in series with the arc lamp is closed into the circuit when the arc lamp begins to conduct, thereby changing the resonant frequency of the parallel inductor-capacitor resonant circuit. The detection of current flow in the arc lamp causes a resistor to be switched into the resistive network controlling the frequency of the pulse-width modulated signal, thereby changing the frequency of the rectangular wave AC signal.
REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4525650 (1985-06-01), Hicks et al.
patent: 4698554 (1987-10-01), Stupp et al.
patent: 4700111 (1987-10-01), Folwell et al.
patent: 4700113 (1987-10-01), Stupp et al.
Lester and Cohen, "The RF Starter and its Application to Miniature Metal Halide Lamps", Journal of the Illuminating Engineering Society (1986).
American Sterilizer Company
Mis David
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