Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Automatic cut-out or voltage regulator in the cathode or...
Patent
1988-12-22
1991-01-01
Pascal, Robert J.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Automatic cut-out or voltage regulator in the cathode or...
315219, 315DIG2, H05B 3702
Patent
active
049821377
ABSTRACT:
An apparatus is provided for driving a discharge lamp, the discharge lamp having first and second electrodes, each of the first and second electrodes having first and second terminals. The apparatus includes a switching circuit coupled to the first terminals of the first and second electrodes of the discharge lamp for supplying a high frequency signal to the discharge lamp for igniting the discharge lamp. A starting circuit is provided connected to the second terminals of the first and second electrodes of the discharge lamp and including an inductor and capacitor connected in parallel across the discharge lamp. Alternately, a thermister is provided between parallel connected conductor and capacitor and one of the second terminals of the first electrode of the discharge lamp. Furthermore, circuitry is provided which is connected between the switching circuit and the thermister for deactivating the switching circuit when the thermister is heated to a specified temperature.
REFERENCES:
patent: 4238708 (1980-12-01), Kaneda
patent: 4647817 (1987-03-01), Fahnrich et al.
Horii Shigeru
Ito Kazuhiko
Kichibayashi Masakatsu
Miyazaki Kouji
Ozawa Masakatsu
Matsushita Electric - Industrial Co., Ltd.
Pascal Robert J.
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