FR2641661A2 - Enhancement to the aperiodic generator - Google Patents

Abstract

Device intended to allow accurate matching of an aperiodic generator to its load, characterised by the use, on one transformer, of windings arranged over a fraction of a common magnetic circuit, so as to obtain intermediate voltages between two consecutive turns of the secondary winding of the aperiodic transformer.

Description

 In invention patent N 8419859, provision is made for using an auxiliary self-tensor T2 to perform fine adjustment of the generator to its load.

 The object of the present invention is to improve the aperiodic transformer T1 taught by this last document, and consists in providing one or more of the auxiliary windings on magnetic circuits of the transformer TI in order to allow this adaptation.

 The transformer T1 is usually made on a magnetic circuit called armored which consists of a central leg on which the winding is switched. The magnetic circuit loops back on either side of the central leg via 2 side legs.

Each of the side legs has a section which is half that of the central leg.

 These magnetic circuits are usually produced by the juxtaposition of ferrite circuits U.

 The magnetic flux which circulates in the central leg is divided into 2 equal fractions and which circulates in the lateral legs.

The tension by turns induced in a winding wound on each of the lateral legs will therefore have a tension half lower than a winding wound on the central leg. This results in the possibility of producing voltages which will be a fraction of those available between two consecutive turns of the aperiodic transformer.

 For example, in a high frequency aperiodic transformer, the voltage per turn is of the order of 200 volts.

The secondary voltage usually used is 350 to 500 volts.

Without a voltage distributor, the user will have 0 - 200 - 400 - 600 volt sockets.

The role of the transformer makes it possible to have intermediate voltages and therefore to allow a precise adaptation of the generator to its load.

 If there are 2 windings c and d, made on one of the 2 legs or the 2 lateral legs of the transformer, the voltage generated will be 100 volts per spirr instead of 200.

 It will therefore be possible to add or subtract the voltages thus generated, from the existing voltages on the secondary of winding b.

This will provide voltages 0 - 100 - 200 - 300 - 400 - 500 - 600 volts. In practice, we will limit ourselves to 300 - 400 and 500 volts.

 Although it does not allow an adaptation as fine as the auxiliary transformer, this device solves the majority of adaptation problems. It is also possible to install windings on the half of each side leg. We will thus have a new division by 2, or 50 volts per turn. This device has two advantages compared to previous techniques, on the one hand, it allows a fine adaptation of the generator from the aperiodic transformer, on the other hand, it avoids an auxiliary transformer of adaptation. in 100 volts or 50 in 50 volts, are available to the user without having to carry out eommutati (ns as was necessary in the case of the use of the auxiliary transformer.

 Finally, such a device has a parasitic inductance much lower than that of the device consisting in using an auxiliary transformer @.

 The figure ann @ xed il @ ustre a possible embodiment of the device object of the invention.

 The two windings a and b are coils around a magnetic circuit e.

 Two additional windings respectively c and d are connected between sockets 2 and 3 and 3 and 4 of the secondary winding b.

These two windings are themselves provided with a median grip marked 2.5 and 3.5.

 Tension per pi. e in these two lateral windings is half of induced crane 1ane winding b or a. It therefore appears on the sockets marked 2.5 ct 3.5 an intermediate voltage between that which exists between the sockets 2 @t 3 @t 3 @t 4.

Claims (1)

 SINGLE CLAIM  Device intended to allow a precise adaptation of the generator to its load, characterized by the use, on the same transformer, of windings c and d carried out on a fraction of the magnetic circuit e of said transformer in order to generate voltages which are in the section ratio between the total magnetic circuit and the fraction used. The windings thus formed are connected to the terminals of two consecutive turns of the secondary winding in order to divide this tension by the desired factor.