CN2139736Y - High precision shunt resistor - Google Patents
High precision shunt resistor Download PDFInfo
- Publication number
- CN2139736Y CN2139736Y CN 92218841 CN92218841U CN2139736Y CN 2139736 Y CN2139736 Y CN 2139736Y CN 92218841 CN92218841 CN 92218841 CN 92218841 U CN92218841 U CN 92218841U CN 2139736 Y CN2139736 Y CN 2139736Y
- Authority
- CN
- China
- Prior art keywords
- shunt resistor
- resistance
- high precision
- wire
- resistance wire
- 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.)
- Expired - Fee Related
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Abstract
The utility model provides a high precision shunt resistor, comprising resistance wires, resistance wire leading wires, a casing and filling materials. The high precision shunt resistor is characterized in that a plurality of resistance wires with the same resistance and low temperature coefficient are connected in parallel with bus bars to form a shunt resistor. The casing of the high precision shunt resistor adopts a hollow rectangular flat box made of aluminium alloy, wherein, the filling materials adopt insulation oxide with good heat dispersion to generate insulating oil. The shunt resistor has the advantages of reasonable structural design, high precision and favorable heat stability. High precision and favorable heat stability are kept particularly under the operating state of heavy current, and the high precision shunt resistor can be matched with various precise instruments.
Description
The utility model provides a kind of high-accuracy shunt resistor, belongs to the essential electronic element in the electricity field.
Shunt resistor is widely used in the instrument, instrument of electricity field.When the electric current that is passed through in the instrument surpasses its range, will use shunt resistor to come range extension.Present widely used shunt resistor is to adopt the low common resistor of resistance.Their shortcoming is that poor heat stability, precision are low, when on the shunt resistance during by big electric current, produces bigger heat on resistance wire, this heat can not distribute very soon, thereby can make resistance that bigger variation takes place, cause poor stability, precision low, the supporting use of instrument that can not be higher with precision.
The purpose of this utility model be to provide a kind of can with the matching used shunt resistor of precision instrument, the Heat stability is good of this shunt resistor, precision height.
High-accuracy shunt resistor provided by the utility model is made up of resistance wire, resistance wire lead-in wire, inserts and shunt resistor housing.It adopts more than three, and resistance is identical, and the resistance wire of TCR≤10ppm is formed in parallel, and resistance wire forms the shunt resistance body by the wire bonds that is connected to its two ends on bus-bar, and the solder joint between the lead-in wire at resistance wire and its two ends is the silver soldering point.The housing of shunt resistor adopts aluminium alloy to make the flat box body of hollow rectangle of two side angle openings.Two bus-bars are symmetricly set on the both sides of shunt resistor shell nozzle, the inserts in the housing be the graininess insulation oxide as above silicon dioxide or alundum (Al inserts can also use insulating oil, such as transformer oil, methyl-silicone oil, ethyl silicon oil etc.The opening epoxy encapsulation of shunt resistor both sides, bus-bar are loaded in the opening and must not contact with the shunt resistor housing.
Shunt resistor provided by the utility model, owing to adopted many TCR≤10ppm resistance wire to be formed in parallel, the resistance of this shunt resistor only is the 1/n that forms every resistance wire resistance of shunt, so make the shunt resistor of low resistance easily, owing to be to be formed in parallel by many resistance wires, the electric current of being shared when being contained in supporting use on the instrument is assigned on each root resistance wire, only be the 1/n that should shunt, significantly reduce the thermal stress variation that causes thus, thereby reduced the variation of each root resistance wire resistance.Simultaneously, owing to adopt graininess insulating metal oxide (Al
2O
3, SiO
2) or the insulation oils (transformer oil, methyl-silicone oil, ethyl silicon oil) do inserts, the heat dispersion of these materials is fabulous, can the very fast heat transferred shunt resistor housing that electric current is produced on resistance wire, and the shunt resistor housing is made with aluminium alloy, heat dispersion is good, this this structure has guaranteed that shunt resistor can will dissipate owing to the heat that energising produces very soon on resistance wire, thereby eliminates thermal stress.Simultaneously because the resistance wire that adopts is the low resistance wire of temperature coefficient of TCR≤10ppm, under identical heat situation the variation of resistance less, guaranteed that further in the shunting process, the change in resistance of shunt resistor is less.Thereby improve stability.The lead-in wire of resistance wire is connected on the bus-bar in this shunt resistor, adopt silver soldering between resistance wire and lead-in wire, improve reliability, reduced the intermolecular diffusion of different metal, reduced the thermoelectric potential that the different materials contact produces, again because the setting of lead-in wire is symmetrical, all adopt silver soldering therefore the thermoelectric potential that two ends produce to be offset again between two lead-in wires and resistance wire, shunt resistor is done the flat box body of rectangularity, and shared spatial volume is little, is easy to and the supporting installation of instrument.
High-accuracy shunt resistor provided by the utility model, reasonable in design, manufacturing process are easy, has the precision height, the advantage of Heat stability is good, particularly under the operating state of big electric current, still kept high precision and thermal stability, this shunt resistor is fit to and the supporting use of various precisions range extension.
Description of drawings:
The outline drawing of Fig. 1, shunt resistor that the utility model provides
4, bus-bar 5, housing 9, epoxy resin seal
The shunt resistance body structure figure of Fig. 2, shunt resistor that the utility model provides.
1, resistance wire 2, lead-in wire 3, silver soldering point 6, fairlead
Fig. 3, the utility model provide the shunt resistor cutaway view
7, screw on inserts 8, the shell
Embodiment
The shunt resistor housing all adopts forging type to make the flat box body of rectangle of both-side opening with aluminium alloy in following examples, bus-bar adopts zinc-plated copper coin or sheffield plate, resistance wire adopts manganin filament winding spirality, lead-in wire adopts general copper conductor, adopt silver soldering between lead-in wire and the resistance wire, lead-in wire is welded in the resistance wire two ends, lead-in wire is connected on the fairlead of bus-bar with soldering or silver soldering, after having welded resistance wire on the bus-bar, the shunt resistance body is put into Al-alloy casing, bus-bar is symmetrically placed in a side opening of earlier sealing Al-alloy casing with epoxy resins in rectangle box body both sides makes bus-bar place in the middle of the opening and casing insulation, after reinstalling inserts, just make with epoxy resin sealing opposite side open split resistor, following table is material numerical value such as the resistance wire of each embodiment and inserts, and become the performance parameter of shunt resistance.
Claims (3)
1, a kind of high-accuracy shunt resistor, form by resistance wire, resistance wire lead-in wire, shunt resistance housing, inserts etc., the resistance wire that it is characterized in that described composition shunt resistor is equated by three above resistances, resistance wire be formed in parallel, resistance wire is connected on formation shunt resistance body on the bus-bar by the lead-in wire at its two ends, the flat box body of hollow rectangle of the both-side opening that the housing employing aluminium alloy of shunt resistor is made, the bus-bar symmetry is located at the two sides of shell nozzle, and the inserts in the housing becomes insulating oil for the graininess insulation oxide.
2,, it is characterized in that every resistance wire of described composition shunt resistor, TCR≤10ppm according to the described shunt resistor of claim 1.
3,, it is characterized in that every resistance wire of described composition shunt resistor and the tie point between the lead-in wire of its two ends are the silver soldering point according to claim 1 or 2 described shunt resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92218841 CN2139736Y (en) | 1992-09-29 | 1992-09-29 | High precision shunt resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92218841 CN2139736Y (en) | 1992-09-29 | 1992-09-29 | High precision shunt resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2139736Y true CN2139736Y (en) | 1993-08-04 |
Family
ID=33766261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92218841 Expired - Fee Related CN2139736Y (en) | 1992-09-29 | 1992-09-29 | High precision shunt resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2139736Y (en) |
-
1992
- 1992-09-29 CN CN 92218841 patent/CN2139736Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |