Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load
Patent
1985-06-18
1988-09-06
Moore, David K.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Discharge device load
315 57, 315223, 315224, 315243, 315241R, H05B 4116, H05B 4100
Patent
active
047695781
ABSTRACT:
A high-pressure sodium discharge lamp comprising a discharge vessel (3) provided with an external auxiliary electrode (11) and a built-in electric starting circuit including an electric circuit comprising a transformer winding (35a), a capacitor (33) and a semiconductor switching element (34). The circuit is connected in series with a resistor (32) electrically parallel to the discharge vessel (3) and with the transformer (35) electrically connected to the external auxiliary electrode (11). The semiconductor switching element (34) is an uncontrolled voltage-dependent breakdown element of the thyristor type having a breakdown current smaller than 1 mA at a breakdown time shorter than 10 .mu.s. The resultant lamp starts very reliably and its build-in starter dissipates only a very low power.
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Chermin Hubertus M. J.
Jacobs Cornelis A. J.
Franzblau Bernard
Moore David K.
Razavi Michael
Treacy David R.
U.S. Philips Corporation
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