Precision current sensing element and manufacturing method thereof

Abstract

The invention belongs to the field of precision current sensing elements and particularly relates to a structure of a multi-layer structured precision current sensing element with a radiating layer, and a manufacturing method for the structure. The multi-layer structured precision current sensing element comprises at least one layer of resistor body, two layers of radiating sheets, electrodes, an insulation heat conduction adhesive layer, via holes and a protection layer, wherein an insulation slit is formed between the radiating sheets; the insulation heat conduction adhesive layer is arranged between one metal layer and another metal layer; the electrodes are arranged on two sides of a product; the electrodes are connected with the resistor body and the radiating sheets; a via hole is formed in each electrode; and the via holes are connected with the resistor body and the radiating sheets. In the manufacturing method, the thick resistor body is decomposed into a plurality of thin resistor bodies; the thin resistor bodies are subjected to resistance modification, and alloy sheets are connected in parallel with one another; each resistor body is at least provided with one radiating sheet for radiation, so the radiating property of the product is enhanced greatly; furthermore, a layer of protection layer is covered on the outer layer of the multi-layer structured precision current sensing element. The precision current sensing element is high in practicability.

Description

technical field [0001] The invention belongs to the field of precision current sensing elements, and in particular relates to a structure and a manufacturing method of a precision current sensing element for overcurrent protection. Background technique [0002] As we all know, the size of the resistance is related to three factors, the resistivity of the conductor, the length of the conductor and the cross-sectional area of ​​the conductor. Under the premise that the conductor material is fixed, the resistivity of the conductor remains unchanged. To increase the resistance, the length of the conductor can be increased or the cross-sectional area of ​​the conductor can be decreased. To improve the current resistance of the conductor, there are three ways to reduce the resistance, or to increase the length of the conductor in proportion to the cross-sectional area of ​​the resistance without changing the resistance, or to improve the heat dissipation effect. [0003] Most of...

AI Technical Summary

Problems solved by technology

Reduced efficiency, reduced yield, and sharply increased costs

[0005] As described in the document CN201117381Y, the resistance layer is attached to the ceramic substrate by means of an adhesive layer. The only way to increase the power is to reduce the resistance by continuously superimposing single-layer products, and the superposition of alloy sheets is also accompanied by the increase of ceramic sheets. , in this way, the thickness of the product increases sharply, and the overlapping of different layers of ceramic sheets is also a big problem, and the lamination of multi-layer ceramics is more likely to cause the ceramic sheets to crack and reduce product performance

Affected by the thickness of the product, the product cannot be miniaturized. In today's increasingly miniaturized products, it is obviously an unsatisfactory process.

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