STARTER FOR IGNITING A GAS AND/OR VAPOUR DISCHARGE LAMP

摘要

PHN.8604 13-9-1977 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 that a defective lamp must be replaced by a new lamp - the mains voltage being switched on - in spite of the hot state of the resistor with positive temperature coefficient a plurality of starting pulses will neverntheless be passed through the second capacitor to the new lamp whereafter this lamp can ignite. Fig. no. 1.