ES407217A1 - Improvements in the bipolar electronic starters for the priming of fluorescent lamps. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements in the bipolar electronic starters for the priming of fluorescent lamps, with preheating of the electrodes in the form of filaments of the fluorescent lamp, comprising two terminals intended to be electrically connected each to a filament of the fluorescent lamp so that they form, with said filament, a series assembly in turn intended to be connected to an alternating current source, characterized in that the starter comprises, between its two terminals, an electronic bidirectional driving switch as well as a threshold trigger circuit for sending control pulses at a control input of the bidirectional electronic switching switch, the trip circuit essentially being composed of a threshold diode one of whose electrodes is connected to the control input of the electronic switch, while its other electrode is connected to one of the armors of a capacitor, connected to turn to an intermediate tap of a voltage divider bridge that is powered by the alternating current source and forms a charging circuit and a discharge circuit for the capacitor, and because the voltage divider bridge presents a means capable of sliding the potential of the intermediate tap in such a sense that the voltage to which said capacitor is charged at each alternation of the alternating supply voltage is converted, after a predetermined time for which the voltage applied to the fluorescent lamp is normally sufficient to cause its priming, below the trigger threshold of the threshold diode, in order to keep the electronic switch in the locked state. (Machine-translation by Google Translate, not legally binding)