Electronic power supply of electrical energy of a load, preferably of a capacitive type, such as particularly a tube discharge, periodically in the short - circuit without destruction of said power supply

摘要

The invention relates to an electronic supply of a receiver 13 of the capacitive type, such as particularly to a discharge tube, comprising a generator 2 of the dc voltage tc1, converted by a chopper 4 in a continuous voltage tc2 supplying a first capacitor 6 of the storage of energy, said voltage tc2 is converted by an inverter 8 in an alternating voltage rectangular ta1, applied to a converter 9 of the alternating voltage to a galvanic insulation, such as particularly to a power transformer, the alternating voltage ta2 being then rectified by a dc voltage tc3 placed at the terminals of the receiver 13. This supply is characterized, on the one hand, in that the control stage 50 of the inverter 8 gives an operation at constant duty ratio, very close to 50%, and on the other hand, in that the control stage of the chopper 4 has a means for adapting its duty cycle of operation as a function of the result of the comparison performed between the current consumed by the receiver 13 and a current of predetermined set, and also as a function of the result of the comparison performed between the dc voltage tc3 applied to the receiver 13 and a voltage of predetermined value.