Extensible alloy resistor

Abstract

The utility model discloses an extensible alloy resistor which comprises at least two groups of resistor bodies which are stacked up and down, and the two adjacent groups of resistor bodies are connected through a radiator; the upper surface of the resistor body is a flat surface, and two ends of the bottom end surface of the resistor body are step parts protruding outwards; the bottom end face of the heat dissipation body is a flat face, welding parts protruding outwards are arranged at the two ends of the upper surface of the heat dissipation body, and notches penetrating through the heat dissipation body are downwards formed in the middle positions of the welding parts. The bottom end face of the heat dissipation body is connected with the upper surface of the lower resistor body in a welded mode, and the welding part of the heat dissipation body is connected with the step part of the upper resistor body in a welded mode. According to the utility model, the two or more groups of resistor bodies are arranged in a laminated manner, the adjacent resistor bodies are connected through the heat dissipation bodies, and the resistor bodies can be connected in series or in parallel according to actual working requirements, so that the resistance value in a larger range is obtained, and the purposes of signal transmission and power adaptation are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of alloy resistors, in particular to an expandable alloy resistor. Background Art

[0002] Alloy resistors refer to resistors that use alloys as current media. They have the characteristics of low resistance, high precision, low temperature coefficient, resistance to impact current, and high power. They are widely used in precision instruments, military products, aerospace electronics, new energy photovoltaic products, automobiles, etc.

[0003] For example, the Chinese patent CN219800574U of the prior art discloses a partially plastic-encapsulated anti-oxidation high-power alloy resistor, comprising a resistor body, electrodes located on both sides of the resistor body, and a plastic encapsulation material covering a partial surface of the alloy resistor, wherein the plastic encapsulation material covers the surface of the anti-oxidation high-power alloy resistor excluding the two end faces in the length direction and the electrode welding area.

[0004] Generally speaking, the larger the resistance value, the thinner and finer the resistor body will be. When the thickness of the resistor body is as thin as 0.1mm or less, it is equivalent to the thickness of an A4 paper. It has low strength and is easy to deform. The higher the requirements for the current carrying capacity and heat dissipation of the resistor body, the resistance value of a traditional single alloy resistor can reach 5mR due to the limitations of structural strength and heat dissipation capacity. The application of only a single alloy resistor is difficult to meet the market demand for large-resistance alloy resistors (such as new energy photovoltaic products). Utility Model Content

[0005] In view of this, an object of the present invention is to provide an expandable alloy resistor, which can be stacked and used to increase the overall resistance value.

[0006] To achieve the above purpose, the utility model adopts the following contents:

[0007] The utility model provides an expandable alloy resistor, which comprises at least two groups of resistor bodies stacked up and down, and two adjacent groups of resistor bodies are connected through a heat sink;

[0008] The upper surface of the resistor is a flat surface, and both ends of the bottom end surface of the resistor are stepped portions protruding outwards;

[0009] The bottom end surface of the heat sink is a flat surface, and the two ends of the upper surface of the heat sink are welding parts protruding outward, and a groove penetrating the heat sink is opened downward along the middle position of the welding part; the bottom end surface of the heat sink is welded to the upper surface of the resistor below, and the welding part of the heat sink is welded to the step part of the resistor above.

[0010] According to the expandable alloy resistor provided by the utility model, the heat sink is made of ceramics. Ceramics have good thermal stability and can prevent deformation due to heat.

[0011] Furthermore, the height of the step portion is greater than the height of the welding portion. The welding portion is used to weld the resistor, and the step portion is used as a medium to connect the circuit board. A certain distance should be left between the resistor and the circuit board surface to meet the distribution of the solder joints on the circuit board surface.

[0012] Furthermore, the thickness of the resistor is 0.35-1.15 mm, and preferably, the thickness of the resistor is 0.65 mm.

[0013] Furthermore, the heat sink has a thickness of 0.1-0.4 mm, and preferably, the heat sink has a thickness of 0.2 mm.

[0014] Furthermore, the thickness of the step portion is 0.04-0.06 mm, and preferably, the thickness of the step portion is 0.05 mm.

[0015] Furthermore, the thickness of the welding portion is 0.02-0.04 mm, and preferably, the thickness of the welding portion is 0.03 mm.

[0016] Compared with the prior art, the utility model has the following technical effects: the utility model has a simple structure and a reasonable design; it adopts the form of stacking two or more groups of resistors to increase the overall resistance, and adjacent resistors are connected by a heat sink to improve the heat dissipation effect, and it also facilitates the stacking of two groups of resistors. Two or more groups of resistors can be connected in series or in parallel according to actual working requirements to obtain a wider range of resistance values, thereby achieving the purpose of signal transmission and power adaptation. Of course, the resistors can also be used alone. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the main view of an expandable alloy resistor according to an embodiment of the utility model;

[0019] Figure 2 It is a top view schematic diagram of a heat sink according to an embodiment of the utility model;

[0020] Figure 3 It is a side view schematic diagram of an expandable alloy resistor according to an embodiment of the utility model;

[0021] 1-resistor, 2-heat sink, 11-step portion, 21-welding portion, 22-notch. DETAILED DESCRIPTION

[0022] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0024] See also Figures 1 to 3 The present invention provides an expandable alloy resistor, comprising at least two groups of resistor bodies 1 stacked up and down. Figure 1 There are four groups of resistors in total, and two adjacent groups of resistors 1 are connected through the heat sink 2; the upper surface of the resistor 1 is a flat surface, and the two ends of the bottom end surface of the resistor 1 are outwardly protruding step portions 11; the bottom end surface of the heat sink 2 is a flat surface, and the two ends of the upper surface of the heat sink 2 are outwardly protruding welding portions 21, and a notch 22 penetrating the heat sink 2 is opened downward along the middle position of the welding portion 21, and the surface area of ​​the resistor 1 exposed below the notch 22 is the welding point position used for series / parallel connection later; the bottom end surface of the heat sink 2 is welded to the upper surface of the resistor 1 below, and the welding portion 21 of the heat sink 2 is welded to the step portion 11 of the upper resistor 1.

[0025] In this embodiment, the heat sink 2 is made of ceramics, which have good thermal stability and can prevent deformation due to heat.

[0026] It should be noted that the height of the step portion 11 is greater than the height of the soldering portion 21. The soldering portion is used to solder the resistor, and the step portion is used as a medium to connect the circuit board. A certain distance should be left between the resistor and the circuit board surface to meet the distribution of solder joints on the circuit board surface.

[0027] In this embodiment, the thickness of the resistor 1 is preferably 0.65 mm, and the actual thickness of the resistor may be in the range of 0.35 to 1.15 mm.

[0028] In this embodiment, the thickness of the heat sink 2 is preferably 0.2 mm, and the actual thickness of the heat sink may be in the range of 0.1 to 0.4 mm.

[0029] In this embodiment, the thickness of the step portion 11 on the resistor 1 is preferably 0.05 mm, and the actual thickness of the step portion may be in the range of 0.04 to 0.06 mm.

[0030] In this embodiment, the thickness of the welding portion 21 on the heat sink 2 is preferably 0.03 mm, and the actual thickness of the welding portion may be in the range of 0.02 to 0.04 mm.

[0031] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. An expandable alloy resistor, characterized in that: It comprises at least two groups of resistors stacked up and down, and two adjacent groups of resistors are connected through a heat sink; The upper surface of the resistor is a flat surface, and both ends of the bottom end surface of the resistor are stepped portions protruding outwards; The bottom end surface of the heat sink is a flat surface, and the two ends of the upper surface of the heat sink are welding parts protruding outward, and a groove penetrating the heat sink is opened downward along the middle position of the welding part; the bottom end surface of the heat sink is welded to the upper surface of the resistor below, and the welding part of the heat sink is welded to the step part of the resistor above.

2. The expandable alloy resistor according to claim 1, characterized in that: The heat sink is made of ceramic.

3. The expandable alloy resistor according to claim 1, characterized in that: The height of the step portion is greater than the height of the welding portion.

4. The expandable alloy resistor according to claim 1, characterized in that: The thickness of the resistor is 0.35-1.15 mm.

5. The expandable alloy resistor according to claim 1, characterized in that: The thickness of the heat sink is 0.1-0.4 mm.

6. The expandable alloy resistor according to claim 1, characterized in that: The thickness of the step portion is 0.04-0.06 mm.

7. The expandable alloy resistor according to claim 1, characterized in that: The thickness of the welding part is 0.02-0.04 mm.

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