Non-inductive three-dimensional winding resistor

Abstract

The utility model discloses a kind of non-inductive three-dimensional wire-wound resistors, it relates to wire-wound resistor technical field, the one side of tinned copper wire is fixedly connected with lead cap, the one side of lead cap is fixedly connected with high temperature conduction porcelain body, high temperature conduction porcelain body is provided with electric limit alloy wire, electric limit alloy wire is wound on high temperature conduction porcelain body using cross winding method, in the utility model, when circuit is energized, current flows from the one end of lead cap welded with PCB circuit board, is conducted to the resistance winding formed by electric limit alloy wire and tinned copper wire by spot welding point, since electric limit alloy wire is wound on high temperature conduction porcelain body using cross winding method, this winding method makes the magnetic field generated between winding mutually offset, greatly reduces mutual inductance phenomenon, reduces inductance, therefore when working in high-frequency circuit, no significant inductance effect is generated, ensure the stability of circuit signal transmission, meet the demand of high-frequency circuit to non-inductive resistance.

Description

Technical Field

[0001] This utility model relates to the field of wire-wound resistor technology, specifically a non-inductive three-dimensional wire-wound resistor. Background Technology

[0002] Non-inductive 3D wire-wound resistors are a special type of resistor that combines the characteristics of wire-wound resistors with a non-inductive design. Their core feature is the elimination or significant reduction of inductive effects through a special winding method, while maintaining the high precision, high stability, and high power advantages of wire-wound resistors. Non-inductive 3D wire-wound resistors eliminate inductive effects through a special winding process, while maintaining the high precision, high stability, and high power characteristics of wire-wound resistors. They solve the inductance problem of traditional wire-wound resistors in high-frequency applications and are suitable for scenarios with high requirements for signal integrity and power processing.

[0003] According to Chinese Patent Application No. CN222260678U, a wire-wound resistor, relating to the field of resistor technology, includes a fixed housing. One side of the outer surface of the fixed housing is fixedly connected to a motor. The motor output end is fixedly connected to a lower surface of a transmission shaft. One side of the outer circumferential surface of the transmission shaft is fixedly connected to one side of the inner surface of a transmission mechanism. One side of the outer surface of the transmission mechanism is fixedly connected to one end of a push rod. The other side of the outer surface of the push rod is fixedly connected to one side of the outer surface of a moving plate. One side of the inner surface of the moving plate is fixedly connected to one side of the outer surface of a telescopic plate. The other side of the outer surface of the telescopic plate is slidably connected to one side of the inner surface of the fixed housing. The transmission mechanism includes a flat driving wheel and a flat driven wheel. This invention uses a motor to drive the transmission mechanism to rotate, which in turn causes the push rod to move. The push rod, through the moving plate, causes the telescopic plate to slide horizontally on the inner surface of the fixed housing. This achieves the effect of opening the electronic casing according to the needs of wire-wound resistor maintenance, improving the efficiency of resistor maintenance and solving the problem of low maintenance efficiency in traditional wire-wound resistors.

[0004] In the above solution, the motor drives the transmission mechanism to rotate, the transmission mechanism drives the push rod to move, and the push rod drives the telescopic plate to slide horizontally on the inner surface of the fixed shell through the moving plate. This achieves the opening of the electronic shell according to the maintenance needs of the wire-wound resistor. However, this solution has the following disadvantages: the winding method of traditional wire-wound resistors causes a significant inductive effect during operation. This inductive component will seriously interfere with signal transmission in high-frequency circuit environments, leading to signal distortion, delay, and other problems. It cannot meet the performance requirements of modern high-frequency circuits for resistor components. The horizontal structure of traditional resistors occupies a large space on the PCB board. In areas with tight layouts, space optimization is crucial.

[0005] Therefore, there is an urgent need for a non-inductive, three-dimensional wire-wound resistor to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a non-inductive three-dimensional wire-wound resistor, which solves the problem that the winding method of traditional wire-wound resistors causes a non-negligible inductive effect during operation. This inductive component can seriously interfere with signal transmission in high-frequency circuit environments.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a non-inductive three-dimensional wire-wound resistor, comprising a tinned copper wire, a lead cap fixedly connected to one side of the tinned copper wire, a high-temperature conductive ceramic body fixedly connected to one side of the lead cap, an electrical limiting alloy wire disposed on the high-temperature conductive ceramic body, the electrical limiting alloy wire being wound on the high-temperature conductive ceramic body using a cross-winding method, and the electrical limiting alloy wire being a nickel-chromium alloy wire or a constantan alloy wire.

[0008] Preferably, one end of the lead cap is used for soldering to the PCB circuit board, the high-temperature conductive ceramic body is provided with electronic encapsulation material, the electronic encapsulation material wraps the electrical limiting alloy wire and the high-temperature conductive ceramic body, the lead cap is provided with spot solder joints, and the electrical limiting alloy wire is fixedly connected to the lead cap through the spot solder joints.

[0009] Preferably, the inwardly bent portion of the lead cap is coated with a three-proof paint, and the high-temperature conductive ceramic body is an alkali-free heat-resistant ceramic component.

[0010] Preferably, the outer surface of the electronic encapsulant is provided with a color ring for identifying resistance parameters.

[0011] Preferably, the tin-plated copper wire has a larger cross-sectional area.

[0012] Preferably, the end of the lead cap that is soldered to the PCB circuit board is bent outward at an angle of 90 degrees.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model discloses a non-inductive three-dimensional wire-wound resistor. When the circuit is powered on, the current flows in from one end of the lead cap soldered to the PCB board, and is conducted through the spot solder joint to the resistor winding composed of the limiting alloy wire and the tinned copper wire. Since the limiting alloy wire is wound on the high-temperature conductive ceramic body using a cross-winding method, the magnetic fields generated between the windings cancel each other out, greatly reducing mutual inductance and lowering the inductance. Therefore, when working in high-frequency circuits, no significant inductive effect is generated, ensuring the stability of circuit signal transmission and meeting the requirement of non-inductive resistors in high-frequency circuits. Attached Figure Description

[0014] Figure 1 This is a frontal perspective view of the present invention. Figure 2 This is a three-dimensional structural diagram of the back of the present invention; Figure 3This is a schematic diagram of the exploded three-dimensional structure of this utility model; Figure 4 This is a schematic diagram of the electrical limiting alloy wire structure of this utility model.

[0015] In the diagram: 1. Tinned copper wire; 2. Lead cap; 3. High-temperature conductive ceramic body; 4. Spot solder joint; 5. Electrical limiting alloy wire; 6. Electronic encapsulation material; 7. Color ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1 Please see Figures 1-4 The diagram shows a non-inductive three-dimensional wire-wound resistor, which includes a tinned copper wire 1, a lead cap 2 fixedly connected to one side of the tinned copper wire 1, a high-temperature conductive ceramic body 3 fixedly connected to one side of the lead cap 2, and an electrical limiting alloy wire 5 provided on the high-temperature conductive ceramic body 3. The electrical limiting alloy wire 5 is wound on the high-temperature conductive ceramic body 3 using a cross-winding method. The limiting alloy wire 5 is a nickel-chromium alloy wire or a constantan alloy wire. One end of the lead cap 2 is used for soldering to the PCB circuit board. The high-temperature conductive ceramic body 3 is provided with an electronic encapsulation material 6, which wraps the limiting alloy wire 5 and the high-temperature conductive ceramic body 3. The lead cap 2 is provided with a spot solder joint 4. The electric limit alloy wire 5 is fixedly connected to the lead cap 2 through the spot solder joint 4. The part of the lead cap 2 that is bent inward is coated with three-proof paint. The high temperature conductive ceramic body 3 is an alkali-free heat-resistant ceramic part. The outer surface of the electronic encapsulation material 6 is provided with a color ring 7 for marking resistance parameters. The tinned copper wire 1 adopts a large cross-sectional area specification. The end of the lead cap 2 that is soldered to the PCB circuit board is bent outward at an angle of 90 degrees.

[0018] The resistor wire (tin-plated + nickel-chromium alloy or constantan alloy) is wound on an alkali-free heat-resistant ceramic part using a cross-wound method. The cross-wound method cancels the magnetic field between the wires, reducing mutual inductance and thus lowering the inductance. It can work in high-frequency circuits without producing significant inductive effects. In high-power circuits, this resistor is not prone to oscillation during use and will not damage other components in the circuit. The copper wire winding has a large cross-sectional area, which can resist large surges. At the same time, the number of turns can be flexibly adjusted to achieve ultra-low or ultra-high resistance values. It is made by coating the resistor with silicon element resin or non-flammable coating. It has a non-flammable coating and can completely insulate. The lead cap 2 connects the lead to the electrode. One end of the lead cap 2 is connected to the PCB circuit board for soldering. One end is bent outward, and the other end is bent 180° and then bent inward. The bending point of the same end is different, with a difference of about 0.5mm. This is mainly because the end of the body is heavy and requires a larger support surface to facilitate tape weaving. The purpose of the bending point is to prevent the two ends from falling into the holes of the PCB board and to act as a locking point. The 180° bend leads are coated with conformal coating to prevent short circuits between the leads and the circuit board or other metal parts, protect the leads from corrosion by environmental moisture or other chemicals, and also increase the soldering strength between the leads and the circuit board pads.

[0019] Working principle: When the circuit is powered on, the current flows in from one end of the lead cap 2 soldered to the PCB board, and is conducted through the spot solder point 4 to the resistor winding composed of the limiting alloy wire 5 and the tinned copper wire 1. Since the limiting alloy wire 5 is wound on the high-temperature conductive ceramic body 3 using a cross-winding method, the magnetic fields generated between the windings cancel each other out, greatly reducing the mutual inductance phenomenon and reducing the inductance. Therefore, when working in a high-frequency circuit, no significant inductive effect is generated, ensuring the stability of the circuit signal transmission and meeting the requirement of high-frequency circuits for non-inductive resistors. The tinned copper wire 1 has a large cross-sectional area and strong current carrying capacity, which can effectively resist large surge current in the circuit and protect the circuit safety. Meanwhile, the electric limit alloy wire 5 is made of nickel-chromium alloy wire or constantan alloy wire, and the number of turns can be flexibly adjusted to achieve ultra-low or ultra-high resistance values ​​to adapt to the resistance requirements of different circuits. The electronic encapsulation material 6 wraps the resistor winding and the high-temperature conductive ceramic body 3. On the one hand, it plays an insulating and protective role to prevent short circuits between the inside of the resistor and the outside. On the other hand, the color ring 7 on its outer surface can intuitively mark the resistor parameters, making it easy for users to quickly identify them. The conformal coating on the inward-bent portion of the lead cap 2 prevents short circuits between the pins and the circuit board or other metal parts, resists environmental moisture and chemical corrosion, and increases the soldering strength between the pins and the circuit board pads. The specific angle of the bend in the lead cap 2 (one end bent outward at 90 degrees to be soldered to the PCB, and the other end bent outward first and then inward, with a difference of about 0.5mm in the inflection point) allows it to be precisely secured on the PCB during installation. This facilitates tape and reel operation, ensures that the resistor is securely mounted on the circuit board, saves PCB space, and meets the requirements for compact circuit layouts.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A non-inductive three-dimensional wire-wound resistor, comprising tin-plated copper wire (1), characterized in that: One side of the tinned copper wire (1) is fixedly connected to a lead cap (2), and one side of the lead cap (2) is fixedly connected to a high-temperature conductive ceramic body (3). An electrical limiting alloy wire (5) is provided on the high-temperature conductive ceramic body (3). The electrical limiting alloy wire (5) is wound on the high-temperature conductive ceramic body (3) using a cross-winding method. The electrical limiting alloy wire (5) is a nickel-chromium alloy wire or a constantan alloy wire. One end of the lead cap (2) is used for soldering to the PCB circuit board.

2. The non-inductive three-dimensional wire-wound resistor according to claim 1, characterized in that: The high-temperature conductive ceramic body (3) is provided with an electronic encapsulating material (6), which encapsulates the electrical limiting alloy wire (5) and the high-temperature conductive ceramic body (3). The lead cap (2) is provided with a spot solder joint (4), and the electrical limiting alloy wire (5) is fixedly connected to the lead cap (2) through the spot solder joint (4).

3. The non-inductive three-dimensional wire-wound resistor according to claim 1, characterized in that: The inwardly bent portion of the lead cap (2) is coated with a three-proof paint, and the high-temperature conductive ceramic body (3) is an alkali-free heat-resistant ceramic component.

4. The non-inductive three-dimensional wire-wound resistor according to claim 2, characterized in that: The outer surface of the electronic encapsulant (6) is provided with a color ring (7) for identifying resistance parameters.

5. The non-inductive three-dimensional wire-wound resistor according to claim 1, characterized in that: The tin-plated copper wire (1) adopts a larger cross-sectional area specification.

6. The non-inductive three-dimensional wire-wound resistor according to claim 1, characterized in that: The end of the lead cap (2) that is soldered to the PCB circuit board is bent outward at an angle of 90 degrees.

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