RU2665491C1 - Body for current power measuring microsystems - Google Patents

Abstract

FIELD: measuring equipment; electrical engineering.SUBSTANCE: use for current sensors. Summary of the invention consists in that the housing for microsystems for measuring current strength, comprising a cover and two interconnected body parts: base and insert, the upper surface of the base is formed with a recess for housing components of the current measuring device, the inner wall of the recess is formed with a horizontal step on which the leads are formed to the contact areas of the lead-out frame on the outer surface of the body, mating with projections formed on the upper surface of the insert to form a horizontally oriented U-shaped cavity for locating the conductive bus, the insert has at least two holes vertically intersecting the U-shaped cavity, and in the recess of the lower side of the base, additional recesses are placed opposite the openings in the protruding parts of the insert, with the formation of a vertically oriented U-shaped cavity to accommodate the concentrators when the base and the insert are mated.EFFECT: ensuring the possibility of optimal positioning of elements: a conductive bus, concentrators and crystals containing sensitive elements, which leads to an increase in reliability, accuracy and reproducibility of measurements when conducting current control.1 cl, 3 dwg

Description

The invention relates to the production of microelectronic products and can be used in the construction of current sensors.

A known case for crystals of microsystems of magnetic field analysis according to the patent for utility model of the Russian Federation No. 162094 (IPC H01L 23/02, publ. 05/27/2016), containing a base with a recess, a cover, a gasket located between the base and the cover, and an output frame . The inner wall of the base recess is made with a horizontal step to form a lower cavity of a smaller size to accommodate crystals and the upper cavity. In two lateral opposite walls of the base recess, leads are formed to the contact pads of the lead frame on the outer surface of the base.

Known housing of the current sensor described in the patent for the invention of the Russian Federation No. 2100811 (IPC G01R 19/15, G01R 1/04, publ. 12/27/1997), the housing is made of non-magnetic material, includes a base and two opposing walls and allows placement magnetic flux concentrator partially inside the housing.

Known sealed housing for a semiconductor device or integrated circuit microwave range described in the patent for the invention of the Russian Federation No. 2489769 (IPC H01L 23/055, publ. 08/10/2013), containing a multilayer ceramic base, hermetically connected metal rim and adjacent metal cover sealed to the metal rim.

Known sensor housing for non-contact measurement of current parameters described in the patent for utility model of the Russian Federation No. 108634 (IPC G01R 19/15, published on 09/20/2011), consisting of two parts: the base and the casing. In the lower part of the casing, a through groove is made, which, when assembling the case, when connecting the lower and upper parts, turns into a through hole for placement of the studied conductor in it. A closed magnetic circuit (magnetic flux concentrator) in the form of a frame made of two U-shaped elements can be located inside the housing. One U-shaped element is located in the base, the other in the casing. A sensitive element is also located in the casing, which registers the magnetic field created by the studied conductor placed in the through hole. The casing also houses a printed circuit board on which an electronic device is designed to convert the supply voltage and isolate the measuring signal.

The specified device is the closest to the claimed utility model. The following features coincide with the essential features of the claimed invention: the presence of two parts of the base body connected to each other with a recess, the presence of a U-shaped cavity to accommodate the concentrator.

Obtaining the desired technical result is hampered by the inability to place conductive busbars and concentrators in one housing.

The technical problem to which the invention is directed is to create a case for reliable protection of crystals of magnetic semiconductor circuits, sensors, transducers and sensitive elements of the magnetic field from external influences and providing a fixed distance between the conductive bus and crystals containing sensitive elements.

The technical result obtained by the implementation of the invention is expressed in providing the possibility of optimal positioning of elements: a conductive bus, concentrators and crystals containing sensitive elements, which leads to increased reliability, accuracy and reproducibility of measurements when monitoring the current strength, it should also be noted that the assembly of the current sensor in the proposed housing.

To achieve the above technical result, the housing for microsystems for measuring current strength comprises a cover and two parts of the housing that are interconnected: a base and an insert, the upper surface of the base is made with a recess for accommodating the components of the device for measuring current strength, the inner wall of the recess is made with a horizontal step on which are formed conclusions to the contact pads of the lead frame on the outer surface of the housing, on the bottom side of the base there is a recess mating with the protrusions, made on the upper surface of the insert, with the formation of a horizontally oriented U-shaped cavity for accommodating the conductive bus, at least two holes are made in the insert, vertically intersecting the U-shaped cavity, and additional recesses are made in the recess of the lower side of the base opposite the holes in the protruding parts of the insert, with the formation of the pairing of the base and insert a vertically oriented U-shaped cavity for placement of concentrators.

The structural design of the housing allows for the placement of the U-shaped conductive busbar at the required optimal distance from the sensing element, and the possibility of precise positioning and reliable fastening of the busbar and hubs during housing assembly is also realized. Placing a conductive busbar in a partially insulated space reliably protects the busbar from external influences. These factors can improve the accuracy, reliability and reproducibility of measurements.

The terms “upper”, “lower”, “above”, “under”, etc. in the description and in the claims, if any, are used for the purpose of description and not necessarily to describe permanent mutual positions. It should be understood that the terms used in this way are interchangeable in appropriate circumstances such that the embodiments of the invention described herein allow, for example, to work in different orientations than those presented or otherwise described herein.

The invention is illustrated by the following drawings.

FIG. 1 - microsystem for measuring the current strength in the housing.

FIG. 2 - insert.

FIG. 3 - the lower surface of the base of the housing.

The case for microsystems for measuring current strength contains two parts of the case that are interconnected: the upper one is the base 1 and the lower one is the insert 2 (Fig. 1). The base 1 is closed by a cover 3. The upper surface of the base of the housing 1 is made with a recess 4 to accommodate the components of the current measuring device, such as a printed circuit board 5 and a magnetic field transducer 6. The inner wall of the recess 4 is made with a horizontal step 7, on which conclusions are made to the contact sites of the output frame 8 on the outer surface of the housing. On the bottom side of the base of the housing 1, a recess 9 is made, mating with the protrusions 10, made on the upper surface of the insert of the housing 2 with the formation of a U-shaped cavity 11. In the U-shaped cavity 11 is placed a copper conductive bus 12.

At least two holes 13 are made in the insert 2 of the casing, vertically intersecting the U-shaped cavity 11 (Fig. 2, 3). In the recess 9 of the lower side of the base 1, additional recesses 14 are made, located opposite the holes 13 in the protruding parts of the insert 2, with the formation of a vertically oriented U-shaped cavity to accommodate the concentrators 15 when pairing the base and the insert (upper and lower parts of the housing).

The sealing of the housing space of the base 1 is provided by welding the metal cover 3 by the method of seam-roller welding, which ensures the protection of the product from external factors.

Lead frames 8 are located on two long sides of the housing perpendicular to the mounting plane of the housing. The lead pitch of the case is 1.27 mm. The case has a coating of H2Zl1.5. Covering Chem. Н3. The printed circuit board 5 with components is glued to the bottom of the recess 4, through the through holes of which the crystals of the magnetic field transducer 6 are mounted.

According to the invention, a housing was realized in which a crystal of a microsystem for measuring current strength was placed. Tests have shown an increase in the reliability, accuracy and reproducibility of current measurements.

Claims (1)

A housing for microsystems for measuring current strength, comprising a cover and two parts of the housing that are interconnected: a base and an insert, the upper surface of the base is made with a recess for accommodating the components of the device for measuring current strength, the inner wall of the recess is made with a horizontal step on which conclusions are made to the contact pads the output frame on the outer surface of the housing, on the lower side of the base a recess is made, mating with the protrusions made on the upper surface of the insert, with the image At the same time, by inserting a horizontally oriented U-shaped cavity to accommodate the conductive busbar, at least two holes are made in the insert that vertically intersect the U-shaped cavity, and additional recesses are made in the recess of the bottom side of the base, located opposite the holes in the protruding parts of the insert, with the formation of bases and inserts of a vertically oriented U-shaped cavity for placement of concentrators.

Images