Embedded open-loop Hall current sensor for intelligent contactor

Abstract

The invention discloses an embedded open-loop Hall current sensor for an intelligent contactor and belongs to the field of Hall current sensors. The embedded open-loop Hall current sensor specificallycomprises a circuit board, a gasket, Hall elements, a multi-air-gap magnetic ring and a frame which are all packaged in a magnetic shielding assembly; the magnetic shielding assembly is fixed on an end surface of the intelligent contactor; six bang-shaped grooves with the same shape are symmetrically distributed in the frame; an air gap is reserved between every two grooves; the multi-air-gap magnetic ring is composed of six completely-identical distributed magnetic cores; the magnetic cores are embedded into the bang-shaped grooves of the frame respectively through tight fit; the Hall elements are inserted into the air gaps reserved in the magnetic ring on the frame; the four pins of each Hall element are welded onto the circuit board; the four pins are led out from the circuit board soas to extend into a magnetic shielding cover. With the embedded open-loop Hall current sensor of the invention adopted, under a premise that the length of the air gaps is fixed, the magnetism gathering effect of the magnetic ring is effectively enhanced, and a flux leakage amount at the air gaps is reduced.

Description

technical field [0001] The invention relates to the field of Hall current sensors, in particular to an embeddable open-loop Hall current sensor for an intelligent contactor. Background technique [0002] The contactor is a switching device suitable for frequently connecting and disconnecting the AC and DC main circuits at a long distance, and it does not have the function of overcurrent protection itself. The main contact of the traditional contactor is connected to the main circuit, and the coil is energized or de-energized through the auxiliary contact of the thermal overload relay and the start stop button, so that the contactor is released or pulled in, and the main circuit is controlled to be on or off. Relatively speaking, the structure is complex and inconvenient to use. The intelligent contactor developed in recent years adds an intelligent protection controller to the main part of the traditional DC contactor. The controller requires a current detection function, w...

AI Technical Summary

Problems solved by technology

[0004] The closed-loop Hall sensor has relatively large bandwidth and fast response, but it is too large to be integrated into a small switching device.

The open-loop Hall sensor has the characteristics of simple process, low cost and small size, but the Hall sensor products on the market cannot adapt to the shape and size of the switching device terminal, and compared with the parameters of the switching device in some applications, there are oversized problem

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