Pulse starting device using a special pulse transformer having integral capacitance

Claim 1

A PULSE STARTING DEVICE FOR INSERTION IN AN ELECTRIC DISCHARGE LAMP OPERATING CIRCUIT OF THE KIND INCLUDING BALLASTING MEANS ENERGIZED BY ALTERNATING CURRENT AND SUPPLYING TO A LOAD CIRCUIT TERMINAL A REGULATED CURRENT FOR AN ELECTRIC DISCHARGE LAMP REQUIRING A STARTING VOLTAGE HIGHER THAN THE OPEN-CIRCUIT VOLTAGE OF SAID BALLASTING MEANS, COMPRISING A PULSE TRANSFORMER INCLUDING A MAGNETIC CORE HAVING WOUND THEREON CONDUCTIVE FOILS WITH THEIR TURNS INSULATED FROM EACH OTHER, SAID FOILS BEING WOUND FLAT TURN UPON TURN ON SAID CORE AND INCLUDING ONE MAIN FOIL PROVIDED WITH AN INTERMEDIATE TAP FORMING A LOAD CIRCUIT TERMINAL AND DETERMINING A PRIMARY WINDING PORTION ON ONE SIDE THEREOF AND SECONDARY WINDING PORTION ON THE OTHER, THE OUTER END OF SAID PRIMARY WINDING PORTION FORMING A LAMP TERMINAL, A FIRST AUXILIARY FOIL EXTENDING ALONG AND WOUND WITH THE PRIMARY WINDING PORTION BUT INSULATED THEREFROM TO PROVIDE AN INTEGRAL CAPACITANCE TO THE END OF SAID PRIMARY WINDING PORTION NEAR SAID LOAD CIRCUIT TERMINAL, A SECOND AUXILIARY FOIL EXTENDING ALONG AND WOUND WITH THE PRIMARY WINDING PORTION BEYOND SAID FIRST AUXILIARY FOIL BUT INSULATED THEREFROM TO PROVIDE AN INTEGRAL CAPACITANCE TO THE OUTER END OF SAID PRIMARY WINDING PORTION, A COMMON TERMINAL COMPLEMENTING BOTH SAID LOAD CIRCUIT TERMINAL AND SAID LAMP TERMINAL AND CONNECTED TO SAID FIRST AUXILIARY FOIL, AND PULSE SWITCHING MEANS CONNECTED BETWEEN SAID SECOND AUXILIARY FOIL AND SAID COMMON TERMINAL.