Arrangement for starting and operating a discharge lamp

Details Arrangement for starting and operating a discharge lamp Arrangement for starting and operating a discharge lamp

1976-11-12

1978-05-02

Smith, Alfred E.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge device and/or rectifier in shunt to the load device

315243, 315273, 315DIG7, H05B 4118, H05B 4136

Patent

active

040877230

ABSTRACT:
The invention relates to an arrangement for starting and supplying a discharge lamp provided with cold electrodes. The lamp is shunted by a starter circuit which consists of a series arrangement of at least a capacitor and a controlled semiconductor switching element having a bidirectional thyristor characteristic.
According to the invention a resistor with a positive temperature coefficient is connected in series with the capacitor and the controlled semiconductor switching element. If the lamp fails to ignite the device produces substantially no radio interference owing to the high-ohmic value of the PTC resistor produced by an increase in its temperature. Furthermore, a controlled semiconductor switching element having a low blocking voltage can now be used. Normal starting of the lamp is hardly affected by the PTC resistor.

REFERENCES:
patent: 3875459 (1975-03-01), Remery et al.
patent: 3890539 (1975-06-01), Remery
patent: 3904921 (1975-09-01), Imaizumi et al.

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