SU920865A1 - Dc-to-ac converter - Google Patents

Description

(54) DEVICE FOR CONVERSION OF CURRENT CURRENT TO VARIABLE

one

The invention relates to devices for measuring transducers of direct current and can be used in measuring information technology.

A known converter of direct current into alternating current, comprising magnetic cores with excitation windings, a measuring winding, a signal winding, a magnetic circuit in the form of two rings, inserted between the measuring and signal windings 1, is applied to them.

But this converter is not suitable for converting direct currents to alternating voltages without breaking the current-carrying parts, saturation of the cores does not allow to extend the range of convertible currents, and the complexity of the design makes it difficult to manufacture.

A device for converting a direct current into an alternating current is known, containing a conductive bus passing through a magnetic circuit made in the form of two C-6 different parallel sections arranged interconnected by two ferromagnetic elements, a Hall element assembled from series-connected links located between

ferromagnetic connecting elements 2.

However, the known device is not reliable in operation.

5 The purpose of the invention is to increase the reliability of the device.

Claims (2)

This goal is achieved by the fact that the device for converting direct current into alternating current, containing a current bus, a Q bus, passing through a magnetic circuit made in the form of two C-shaped parallel sections, interconnected by two ferromagnetic connecting elements, is provided with modulating and the output windings, the connecting elements are made with rectangular cuts, the modulating windings being evenly distributed on each rod of the connecting element, and the output windings cover one2Q temporarily both. rod of the connecting element and are located along the edges of its cutout. FIG. 1 shows the magnetic system of the device with. conductive sheath; in fig. 2 shows the arrangement of the modulating and output windings on the rod and their connection. The converter consists of a magnetic conductor, made by an IZ of two C-shaped parallel sections 1 and 2 (see Fig. 1), interconnected by ferromagnetic connecting elements 3 and 4, made with rectangular cuts, parallelism of connecting elements is maintained by means of wedges insulating material 5 and 6, the conductive bus 7, the modulating winding 8, which is evenly spaced on each rod of the connecting element, the measuring winding 9, simultaneously covering both rods of the connecting socket element and located along the edge of its notch. The Converter operates as follows. FIG. 2 shows one of the ferromagnetic rods with a rectangular notch 3, on which uniformly modulating windings 8 are wound, consisting of two sections interconnected in series, fed by alternating current IM (1H UH) and creating a modulating alternating magnetic flux Φ, whose variation the time from each winding of section 1 is equal and opposite in direction, so there is no EMF at the output of the output winding. If the converted current 1x passes through the current-conducting bus 7 (see Fig. 1), counter-directed magnetic fluxes Fd and Fp are created in the left and right C-shaped magnetic core, in the segment A-A has the maximum value and in the segment BB, this flux decreases by AFD due to leakage of the magnetic flux through the air gap. The magnetic flux Fp in the rod on the explosive segment has a maximum value, and on the AA segment it decreases by AFP due to leakage of the magnetic flux through the air gap. , In the central part of the rod (in the OO segment) these magnetic fluxes 4i, and Ф „are equal (Ф Фц) to each other. The output winding 9 is wound on a rod at two ends of a cutout at equal distances x from the center of the OO, where there are flow differences F - -F AFL (segment AA) and AFP (segment BB). The direction of these difference flows & FJ and L Fp are shown in FIG. 2, and in magnitude they are equal () to each other, since the fluxes and F are the same magnetic resistance, both in the magnetic core and in the air gap. From the currents A and in the output windings of the converter, which are interconnected in series, EMF arises, taking into account the fact that in the segment AA and in the segment BB there are magnetic fluxes yf "and AFP. equal to each other, i.e. D F 1. The EMF Uni is determined by the formula EVY EL + EP 2 / LF Six, (1) where DB is the EMF on the left side of the output winding; EP - EMF on the right side of the output winding; S is the conversion factor. From the formula {1} it can be seen that the output voltage EMF Ev1x is proportional to the converted current I; whose value can be judged by the indications of the measuring device (PI) connected to the free ends of the output windings. If it is required to double the sensitivity of the transducer, then a second rod with a rectangular cut-out is used, which modulates you in the same way; one winding as the first rod. Theoretical research has shown that with the help of this converter, due to the absence of saturation of magnetic materials, it is possible to convert direct currents in the circuits without breaking current-carrying parts in the range from O-10A and above to proportional variable EMF in the range from O-1 V or in the range from -10 V. The proposed DC-to-AC converter can be used in any object where conversion of DC to AC is required without breaking the current-carrying parts of the circuit. The invention The device for transforming direct current into alternating current containing a conductive busbar passing through a magnetic circuit made in the form of two C-shaped parallel sections arranged interconnected by two ferromagnetic connecting elements, characterized in that device reliability, it is equipped with modulating and output windings, connecting elements are made with rectangular cuts, and the modulating windings are evenly spaced on the house. e coupling member and the output are both simultaneously obmotkiohvatyvayut rod connector element and are arranged along the edges of its cut-out. Sources of information taken into account in the examination 1. USSR author's certificate number 230894, cl. H 03 S 7/00, 1967. 2. USSR author's certificate for application number 2798333 / 24-07, cl. H 01 F 40/12, 1979.