Novel precise four-terminal sampling resistor

Abstract

The utility model provides a novel precise four-terminal sampling resistor which comprises a resistor main body, electrode leading-out structures, electrode connecting points, connecting and fixing welding strips and nameplate expressions, the electrode leading-out structures are fixedly arranged on two sides of the resistor main body, the electrode connecting points are fixedly arranged at one ends of the electrode leading-out structures, and the nameplate expressions are arranged on the electrode connecting points. The connecting and fixing welding strip is welded and fixed between the resistor main body and the electrode leading-out structure; the nameplate is fixedly mounted on the surface of the resistor main body; due to the arrangement of the resistor main body, the electrode lead-out structure and the connecting and fixing welding strip, the temperature coefficient is low, the reliability is high, and precise current sampling can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of resistor especially relates to a novel precision four-terminal sampling resistor. BACKGROUND

[0002] In the design of various power supplies such as automobile control circuit, new energy product, battery protection board and switching power supply, current sampling is a constant topic. Whether it is general current control, adjustment, or overcurrent protection, short circuit protection, the first problem to be considered is to detect the current size.

[0003] There are two kinds of sampling methods currently used, one is to use a current transformer, and the other is to use a current sampling resistor. The current transformer performs well in some large current detection, but due to the high price, it is often suitable for applications with small quantity and no special requirements for cost. Generally, various automobile control circuits, switching power supplies, power tools, battery protection boards, lamps, driving motors or power supply parts of products, etc. The second kind of way is mainly used in economic, high-precision, efficient and practical applications. Using resistance for sampling, the resistance is generally placed in the position where the current needs to be sampled, and the voltage value at both ends of the resistance is measured to feedback and determine the current size in the circuit. To ensure accurate sampling, the resistance value of the surface mount sampling resistor is generally small, which can ensure that the sampling resistor does not affect the current in the original circuit.

[0004] Compared with traditional ceramic chip resistors, the performance advantages of alloy resistors are: high precision, low temperature coefficient: the rated power can exceed ceramic resistors by several times under the same package size. The most important point is that in the application of large current sampling and overcurrent protection, short circuit protection, alloy resistors have superior performance, such as ceramic chip resistors, which are often burned out in a short time, while alloy resistors can pass through a relatively strong impact current, protecting other devices in the overall circuit and ensuring the quality of the entire product.

[0005] Compared with copper wire resistors which also use metal as the main material, the most intuitive advantage of surface mount alloy resistors is: stable product performance, high power, high current, stable material performance, not easy to oxidize, high reliability, and not affected by the slight change of the welding position.

[0006] Therefore, it is necessary to invent a novel precision four-terminal sampling resistor. Utility model content

[0007] In order to solve the above technical problems, the utility model provides a novel precision four terminal sampling resistor to solve the problem that the existing resistor still has high temperature coefficient, poor reliability and is difficult to realize precision current sampling. A novel precision four terminal sampling resistor, including resistance main part, electrode lead out structure, electrode connection point, connecting fixed welding strip and nameplate, wherein: electrode lead out structure is fixedly installed on both sides of resistance main part, and electrode connection point is fixedly installed on one end of electrode lead out structure, and the connecting fixed welding strip is welded and fixed between resistance main part and electrode lead out structure; the nameplate is fixedly installed on the surface of resistance main part.

[0008] Resistance main part includes resistance sheet, passivation protective layer and electrode lead out point, and the passivation protective layer is arranged on the outer surface of the resistance sheet, and the electrode lead out point is arranged below the resistance sheet and is connected with the electrode lead out structure.

[0009] The resistance sheet in the resistance main part adopts a rectangular manganese copper alloy metal resistance, and the passivation protective layer adopts a protective film formed by chemical passivation treatment, the resistance sheet is finely adjusted on the surface by mechanical polishing, and the resistance value is adjusted by chemical etching process, and has the following effects: ① resistance function: the resistance sheet in the resistance main part is the core part of the resistor, provides a specific resistance value, and is used for measuring current or voltage. When current flows, a voltage drop proportional to the current is generated, and according to Ohm's law, the voltage drop can be used to calculate the current; ② structural support: the resistance main part is not only the carrier of the resistance, but also provides structural support for the entire resistor, ensuring that other components such as electrode lead out structure and connecting fixed welding strip can be firmly installed and connected; ③ protection effect: the passivation protective layer on the resistance main part can provide protection against corrosion, oxidation and the like, prolonging the service life of the resistor; ④ connection point: the resistance main part also provides the electrode lead out point, which is connected with the electrode lead out structure, ensures that the current is led out from the resistor, and can be connected with the external circuit.

[0010] The electrode lead-out structure adopts two groups of red copper metal sheets, and the electrode lead-out structure is formed into an inwardly bent metal structure through stamping, and the electrode lead-out structure is fixed with the resistance main body through welding; the outer side of the electrode lead-out structure can selectively use a ceramic shell, and the electrode lead-out structure forms four terminals through electrode connecting points, and has the following effects: ① current guidance: the electrode lead-out structure is responsible for transmitting current from the resistance main body to other parts of the circuit, and provides an outlet for the current to flow smoothly; ② physical connection: the electrode lead-out structure is connected with the resistance main body through the electrode connecting points, and ensures stable conduction of the current. In addition, the electrode lead-out structure is fixed on both sides of the resistance main body, providing a firm connection and ensuring stability during long-term use; ③ terminal connection: the electrode lead-out structure forms four terminals through the electrode connecting points, which can be used for connection with external circuits. These terminals can effectively eliminate the influence of lead resistance on measurement results and improve measurement accuracy.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The resistance main body has the following effects: ① resistance function: the resistance sheet in the resistance main body is the core part of the resistor, which provides a specific resistance value for measuring current or voltage. When current flows through, a voltage drop proportional to the current is generated, and according to Ohm's law, this voltage drop can be used to calculate the current; ② structural support: the resistance main body is not only the carrier of the resistance, but also provides structural support for the entire resistor, ensuring that other components such as the electrode lead-out structure and the connecting and fixing welding strip can be firmly installed and connected; ③ protective effect:

[0013] The passivation protective layer on the resistance main body can provide protection against corrosion and oxidation, prolonging the service life of the resistor; ④ connection end point: the resistance main body also provides an electrode lead-out end point, which is connected with the electrode lead-out structure to ensure that the current is led out of the resistor and can be connected with external circuits.

[0014] 2. The electrode lead-out structure has the following effects: ① current guidance: the electrode lead-out structure is responsible for transmitting current from the resistance main body to other parts of the circuit, and provides an outlet for the current to flow smoothly; ② physical connection: the electrode lead-out structure is connected with the resistance main body through the electrode connecting points, and ensures stable conduction of the current. In addition, the electrode lead-out structure is fixed on both sides of the resistance main body, providing a firm connection and ensuring stability during long-term use; ③ terminal connection: the electrode lead-out structure forms four terminals through the electrode connecting points, which can be used for connection with external circuits. These terminals can effectively eliminate the influence of lead resistance on measurement results and improve measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1It is the structural schematic diagram of the utility model.

[0016] Figure 2 It is the structural schematic diagram of the resistance main body of the utility model.

[0017] In the drawing,

[0018] Resistance main body 1, resistance sheet 11, passivation protective layer 12, electrode lead-out end point 13, electrode lead-out structure 2, electrode connecting point 3, connecting fixed welding strip 4, nameplate 5. Specific embodiments

[0019] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below, obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor should belong to the protection scope of the utility model.

[0020] As shown in the accompanying Figure 1 To the accompanying Figure 2 As shown.

[0021] The utility model provides a kind of novel precision four-terminal sampling resistor, including resistance main body 1, electrode lead-out structure 2, electrode connecting point 3, connecting fixed welding strip 4 and nameplate 5, wherein: electrode lead-out structure 2 is fixedly installed in the both sides of resistance main body 1, and electrode connecting point 3 is fixedly installed in one end of electrode lead-out structure 2, and this connecting fixed welding strip 4 is welded and fixed between resistance main body 1 and electrode lead-out structure 2;The nameplate 5 is fixedly installed on the surface of resistance main body 1.

[0022] Resistance main body 1 includes resistance sheet 11, passivation protective layer 12 and electrode lead-out end point 13, and passivation protective layer 12 is arranged on the outer surface of resistance sheet 11, and the electrode lead-out end point 13 is arranged below resistance sheet 11 and is connected with electrode lead-out structure 2.

[0023] Resistance sheet 11 in resistance main body 1 adopts a rectangular manganese-copper alloy metal resistance, and passivation protective layer 12 adopts a layer of protective film formed by chemical passivation treatment, the surface of resistance sheet 11 is finely adjusted by mechanical polishing, and the resistance value is adjusted by chemical etching process.

[0024] Electrode lead-out structure 2 adopts two groups of purple copper metal sheets, and electrode lead-out structure 2 is formed into inwardly bent metal structure by stamping, and electrode lead-out structure 2 is fixed with resistance main body 1 by welding;The outside of electrode lead-out structure 2 can select to use ceramic shell, and electrode lead-out structure 2 forms four terminals through electrode connecting point 3.

[0025] The device has the following advantages compared to existing technology:

[0026] 1. Precise measurement performance:

[0027] The device uses a new type of precise four-terminal sampling resistor, such as resistor body 1 and electrode lead-out structure 2, which can accurately measure current. The four-terminal structure significantly improves the measurement accuracy by eliminating the influence of lead resistance, avoiding the interference of contact resistance and line resistance on the measurement results, thereby providing more reliable and accurate test data.

[0028] 2. Improved stability and durability:

[0029] The device adopts a passivation layer 12 and a protective film technology to ensure better oxidation resistance and corrosion resistance of the resistor body 1 during use, extending the service life. In addition, the electrode lead-out structure 2 is formed by a special stamping process, with high structural strength and stability.

[0030] 3. Stronger adaptability:

[0031] The electrode lead-out structure 2 supports the use of a ceramic shell option, which can provide better protection in different working environments, adapt to extreme environments such as high temperature and humidity, and improve the adaptability and reliability of the device, suitable for a wider range of applications.

[0032] 4. Modular design, easy to maintain and replace:

[0033] The electrode lead-out structure 2 is connected to the resistor body 1 through the electrode connection point 3, fixed by welding, easy to disassemble and replace. This modular design improves the maintainability of the device, reduces the fault repair time, and users can easily replace damaged parts according to their needs, improving the convenience of use.

[0034] 5. Reducing temperature rise problem:

[0035] The resistor sheet 11 uses manganese-copper alloy metal material, combined with fine mechanical polishing and chemical etching process, to ensure the stability and consistency of the resistance value. This technology reduces the temperature rise effect, improves the measurement accuracy and long-term stability of the device, and avoids measurement errors caused by temperature changes.

[0036] Optimized structure design:

[0037] The electrode lead-out structure 2 of the device is formed by stamping, optimizing the connection between the electrode and the resistor body 1, ensuring good contact quality, while also reducing production cost and complexity.

[0038] In summary, compared with the prior art, the device has more accurate measurement capability, higher stability, durability and adaptability, and also has significant improvement in maintainability and operation convenience, and can meet more complex and demanding work requirements.

[0039] The technical scheme disclosed by the utility model, or the technical scheme designed by the person skilled in the art inspired by the technical scheme of the utility model, similar technical schemes achieving the above technical effects fall within the protection scope of the utility model.

Claims

1. A novel precision four-terminal sampling resistor characterized by: The utility model provides an electrode lead-out structure, electrode connecting point, connecting fixed welding strip and nameplate indication are arranged on the resistance body, and the electrode lead-out structure is fixedly installed on both sides of the resistance body, and the electrode connecting point is fixedly installed on one end of the electrode lead-out structure, and the connecting fixed welding strip is welded and fixed between the resistance body and the electrode lead-out structure, and the nameplate indication is fixedly installed on the surface of the resistance body.

2. A novel precision four-terminal sampling resistor as claimed in claim 1, characterized in that: The resistance body (1) comprises a resistance sheet (11), a passivation protective layer (12) and an electrode lead-out end point (13), the passivation protective layer (12) is arranged on the outer surface of the resistance sheet (11), and the electrode lead-out end point (13) is arranged below the resistance sheet (11) and is connected with the electrode lead-out structure (2).

3. A novel precision four-terminal sampling resistor as claimed in claim 1, characterized in that: The resistance sheet (11) in the resistance body (1) is a rectangular manganese-copper alloy metal resistance, the passivation protective layer (12) is a protective film formed by chemical passivation treatment, the surface of the resistance sheet (11) is finely adjusted by mechanical polishing, and the resistance value is adjusted by a chemical etching process.

4. A novel precision four-terminal sampling resistor as claimed in claim 2, characterized in that: The electrode lead-out structure (2) is made of two groups of purple copper metal sheets, the electrode lead-out structure (2) is formed into an inwardly bent metal structure by stamping, the electrode lead-out structure (2) is fixed with the resistance body (1) by welding, the outer side of the electrode lead-out structure (2) can optionally use a ceramic shell, and the electrode lead-out structure (2) forms four terminals through the electrode connecting point (3).

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