Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1985-10-31
1988-05-10
Moore, David K.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315208, 315276, 315 60, H05B 4136, H05B 4122
Patent
active
047438100
ABSTRACT:
A matching circuit arrangement for operating a high-pressure discharge lamp. The circuit arrangement is provided with first and second input terminals for connection to a supply source, each of which is connected to a respective first and second output terminal. The output terminals are intended for connection of the high-pressure discharge lamp. A first controlled semiconductor switching element A having a thyristor characteristic is included in a connection between the second input terminal and the respective second output terminal. A control electrode of the switching element A is connected to a main electrode BE2 of a second controlled semiconductor switching element B having a thyristor characteristics. The main electrode AE2 of the first switching element is connected together with the main electrode BE1 of the second switching element to the second input terminal. The main electrode AE1 of the first switching element is connected to the second output terminal. The control electrode BS of the second switch is connected to a voltage divider circuit connected between the input terminals. During operation of the lamp, the lamp current will flow substantially solely via the first switching element so that the housing thereof can directly contact the input terminal, to provide a satisfactory cooling.
REFERENCES:
patent: 3476977 (1969-11-01), Hallay
patent: 4151445 (1979-04-01), Davenport et al.
patent: 4276496 (1981-06-01), Arena-Ochoa
patent: 4342948 (1982-08-01), Samuels
patent: 4370601 (1983-01-01), Horii et al.
patent: 4438372 (1984-03-01), Zuchtriegel
Franzblau Bernard
Moore David K.
Salindong Theodore
U.S. Philips Corporation
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