GB2106710A - Hall effect device - Google Patents
Hall effect device Download PDFInfo
- Publication number
- GB2106710A GB2106710A GB08128566A GB8128566A GB2106710A GB 2106710 A GB2106710 A GB 2106710A GB 08128566 A GB08128566 A GB 08128566A GB 8128566 A GB8128566 A GB 8128566A GB 2106710 A GB2106710 A GB 2106710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hall effect
- relay
- pole
- encapsulant
- pieces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000005355 Hall effect Effects 0.000 title claims description 23
- 239000008393 encapsulating agent Substances 0.000 claims abstract description 8
- 230000005291 magnetic effect Effects 0.000 claims description 4
- 239000003302 ferromagnetic material Substances 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N52/00—Hall-effect devices
- H10N52/80—Constructional details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A hall plate (1) is mounted between a pair of ferro-magnetic pole pieces (3,5) by an encapsulant (7). The pole pieces may protrude as shown or be flush with the surface of the encapsulant. An output amplifier may also be embedded in the encapsulant. The device may be mounted in an air gap of an inductor connected in a telephone line to monitor the DC line condition. <IMAGE>
Description
SPECIFICATION
Hall effect device
This invention relates to Hall effect relays, and to
arrangements for improving the efficiency of such
relays.
According to the invention, there is provided a Hall
effect relay, which includes a Hall effect element
located between two pole-pieces each of which is
made of ferro-magnetic material, the end faces of the two pole-pieces being parallel to each other and
each being close to the Hall effect element, electrical
connections to the Hall effect element, electrical connections to the Hall effect device, and an encapsulant enclosing the Hall effect device and the whole
or a part of each said pole-piece.
An embodiment of the invention will now be described with reference to the accompanying draw
ing, in which Figure 1 is a side view and Figure 2 is a
plan view of a Hall effect relay embodying the
invention.
The arrangement to be described herein was developed for use in a telephone subscriber's line circuit. In such a line circuit, the direct current line supply is fed to the line pair via a source which has a high impedance to alternating current. An inductor source having a built-in series resistance is commonly used. The line current conditions have to be monitored, and this is done by the use of a Hall effect relay in an air gap of an inductor in the direct current power supply. Due to power dissipation in the windings, the iron circuit used for the inductive feed is large compared with the Hall effect relays currently available.
In such an arrangement, the Hall relay measures the amplitude of the direct current in the telephone line by detecting the flux in the inductors air gap, this measurement being useful, inter alia, in testing the line for its looped or unlooped condition.
In the above application, the cross-sectional area of the iron circuit of the inductor is relatively large, of the order 2000 times that of the Hall element of the relay. This suggests that only about one twothousandth of the magnetic flux in the air gap actually influences the Hall element. It is desirable, in order to reduce the need for electronic amplification of the Hall relay output that more of this flux influences the Hall element. To do this the arrangement of Figures 1 and 2 is used. Here we have the
Hall element 1 located between, and closely adjacent to the end faces of two pole-pieces 3, 5.
The pole-pieces in Figures 1 and 2 may be of soft iron or a ferrite, and their outer end faces may each project, as shown, or be flush with the encapsulation 7. The version with projecting pole-pieces has the merit that assembly of the relay into an air gap of the circuit to be monitored is simplified.
The encapsulation may, if desired also enclose an amplifier for the Hall element's output.
With the arrangements described herein we are wasting less magnetic flux than with conventional devices, and are therefore using the flux more efficiently. However, with a given device, a given output signal could be produced with lower coil power, when pole-pieces are used.
Claims (7)
1. A Hall effect relay, which includes a Hall effect element located between two pole-pieces each of which is made of ferro-magnetic material, the end faces of the two pole-pieces being parallel to each other and each being close to the Hall effect element, electrical connections to the Hall effect device, and an encapsulant enclosing the Hall effect device and the whole or a part of each said pole-piece.
2. A Hall effect relay as claimed in claim 1, and in which the overall length of the relay through the two pole-pieces is small so that the relay can fit snugly in the air gap of the magnetic circuit of an inductive element in a circuit to be monitored by the relay.
3. A Hall effect relay as claimed in claim 1 or 2, and in which the outer face of each said pole-piece is flush with the outer surface of the encapsulant.
4. A Hall effect relay as claimed in claim 1 or 2, and in which each said pole-piece extends outwards of the encapsulant.
5. A relay as claimed in claim 1,2,3 or 4, and which includes an electronic amplifier for the output voltage generated by the Hall effect element when the relay is in use, which amplifier is enclosed within the encapsulant.
6. A telephone line circuit feeding arrangement, which includes inductors via which the direct current supply terminals are connected to the two wires of the line, at least one of said inductors having an air gap in its magnetic circuit, and a Hall effect relay as claimed in claim 1,2,3,4 or 5 located in each said air gap.
7. A Hall effect relay substantially as described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08128566A GB2106710A (en) | 1981-09-22 | 1981-09-22 | Hall effect device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08128566A GB2106710A (en) | 1981-09-22 | 1981-09-22 | Hall effect device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2106710A true GB2106710A (en) | 1983-04-13 |
Family
ID=10524661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08128566A Withdrawn GB2106710A (en) | 1981-09-22 | 1981-09-22 | Hall effect device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2106710A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2146872A (en) * | 1983-09-15 | 1985-04-24 | Stc Plc | Hall effect module for loop detector |
| US4972140A (en) * | 1988-06-14 | 1990-11-20 | Stanley Electric Co., Ltd. | Current detection device and core for detection of magnetic flux |
| EP1037057A2 (en) * | 1999-03-09 | 2000-09-20 | Eaton Corporation | Electrical current sensing apparatus |
-
1981
- 1981-09-22 GB GB08128566A patent/GB2106710A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2146872A (en) * | 1983-09-15 | 1985-04-24 | Stc Plc | Hall effect module for loop detector |
| US4972140A (en) * | 1988-06-14 | 1990-11-20 | Stanley Electric Co., Ltd. | Current detection device and core for detection of magnetic flux |
| EP1037057A2 (en) * | 1999-03-09 | 2000-09-20 | Eaton Corporation | Electrical current sensing apparatus |
| EP1037057A3 (en) * | 1999-03-09 | 2001-02-07 | Eaton Corporation | Electrical current sensing apparatus |
| CN100383536C (en) * | 1999-03-09 | 2008-04-23 | 易通公司 | Electric current detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |