Starter for igniting a gas and/or vapor discharge lamp

Details Starter for igniting a gas and/or vapor discharge lamp Starter for igniting a gas and/or vapor discharge lamp

1977-11-23

1980-01-01

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315209CD, 315224, 315240, 315245, 315DIG5, H05B 3904, H05B 4136

Patent

active

041818725

ABSTRACT:
The invention relates to a starter for igniting a low-pressure sodium lamp. The starter is provided with an oscillator circuit consisting of an electric coil, a first capacitor and a controlled semiconductor switching element.
In accordance with the invention the starter also comprises a parallel circuit of a resistor having a positive temperature coefficient and a second capacitor, this parallel circuit and the oscillator circuit being in series. This series circuit is connected between two electrodes of the lamp. In the case where a defective lamp must be replaced by a new lamp--the supply voltage being switched on--in spite of the hot state of the resistor with positive temperature coefficient a plurality of starting pulses will nevertheless be passed through the second capacitor to the new lamp whereafter this lamp can ignite.

REFERENCES:
patent: 3659150 (1972-04-01), Laupman
patent: 4082981 (1978-04-01), Morton et al.

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