SU1183905A1 - Contactless converter of large direct currents - Google Patents

Description

The invention relates to electrical engineering and can be used to measure large constant currents.

The purpose of the invention is to raise 5

conversion accuracy by reducing the impact on the measurement results of external magnetic fields created by adjacent current-carrying conductors. '®

FIG. 1 shows schematically the transducer magnetic circuit} in FIG. 2 is a block diagram of a converter.

The Converter contains a closed magnetic circuit (Fig. 1), consisting of individual ferromagnetic elements 1 and 2. Ferromagnetic elements 1 as well as ferromagnetic elements 2 are installed with longitudinal gaps. Neighboring ferro-20 magnetic elements 1 and 2, in addition, form between themselves and pairs of transverse gaps in which the Hall elements 3 are placed (Fig. 1 and 2). The closed magnetic circuit, together with the Hall elements of 3, is placed in an insulating, body 4, which in the process of measurement covers the bus 5 with a controlled current. Current electrodes of the Hall elements 3 are connected to a source 6 30 DC, which can be performed, for example, in the form of a rectifier 7 connected to an AC network, installed at the output of the rectifier 7 stabilizer 8 current. 35 The Hall electrodes of the Hall elements 3 are interconnected in series, with the Hall electrodes of the Hall elements 3 placed in each pair of transverse gaps formed by one ferromagnetic element 2 and adjacent ferromagnetic elements 1 are connected in opposite directions. To display the measurement results, a Hall device (not shown) is included in the circuit of the series-connected Hall-45 electrodes of the Hall elements 3.

The device works as follows.

After covering the bus 5 with a constant current controlled by the magnetic core, a permanent magnetic flux F # is created in the last controlled current _; which, penetrating the Hall elements 3 (Fig. 1), causes the Hall electromotive voltage on their Hall electrodes, which, due to the counter-switching on of the Hall electrodes of the Hall elements 3 located in each pair of transverse gaps, and the series connection of the Hall electrodes of all Hall elements 3 ( Fig. 2) are arithmetically summed, causing the appearance at the output of a circuit of series-connected Hall electrodes of elements 3 Chol-. la total output emf E _and Hall, proportional to the value of controlled DC. The value of this total EMF E _n Hall is measured using a regulating device (not shown) included in the after-circuit. connected hall electrodes of Hall elements 3.

In the presence of external magnetic fields Φ _{βΗ of} adjacent parallel-arranged tires with currents (Fig. 1), the latter, penetrating Hall's elements 3, cause the EMF of the Hall, not associated with a controlled direct current, i.e. are emf interference. However, these EMF interference due to the counter-inclusion of the Hall electrodes of Hall elements 3, located in each pair of transverse gaps between the ferromagnetic elements 1 and 2, mutually compensate each other and do not cause changes in the total output EMF of the Hall Hall transducer, which increases the conversion accuracy of the proposed device compared to the famous.

Π 83905

FIG. 2o

Claims (2)

A NON-CONTACT TRANSFORMER OF GREAT CONSTANT CURRENTS, containing a closed magnetic circuit made of separate ferromagnetic elements with longitudinal gaps, Hall elements, current electrodes of which are connected to a DC source, and Hall electrodes are connected in series, and a registering device connected to a series of successively connected Hall electrodes , characterized in that, in order to improve the accuracy of the conversion, it introduced ferromagnetic elements forming with mi ferromagnetic elements η pairs of consecutive identical transverse gaps in which the Hall elements are placed, with the Hall electrodes of the Hall elements placed in each _; Doy pair of transverse gaps included counter. four -four- 5ϋ::, 1183905 Fa & .1 > one 1183905 2