Universal multi-contact variable resistance device

Abstract

The utility model provides a universal multi-contact variable resistance device. The universal multi-contact variable resistance device comprises contacts, a control button, a hierarchical circuit and a housing, the plurality of contacts are arranged in the transverse direction and the longitudinal direction, and a control button is arranged between every two adjacent contacts. The hierarchical circuit comprises a first layer of circuit, a second layer of circuit and a third layer of circuit, each layer of circuit comprises a connecting column and a contact, each contact is respectively connected with a plurality of connecting columns, a contact is arranged between every two adjacent connecting columns, and the contacts corresponding to every two adjacent contacts are electrically connected or disconnected. The connecting column is sleeved with a guide wire, the control button is connected with the guide wire, and the guide wire can be controlled to be electrically connected with different hierarchical circuits by pressing the control button. Different resistance values can be obtained in a series connection, parallel connection or series-parallel connection mode by connecting different contacts and pressing a control button between the contacts, different resistance values can be provided for a plurality of circuits at the same time under the condition of uninterruptible power supply, and the problem that a variable resistance device cannot provide various resistance values at the same time can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of varistors, and in particular to a universal multi-contact varistor device. Background Art

[0002] In the field of electronic control and testing, variable resistors (VRs) are key components for adjusting resistance, voltage division, or current limiting. Their performance and application flexibility directly impact the overall efficiency and safety of the system. However, some VRs face limitations in practical applications in multiple scenarios, making them unable to simultaneously provide accurate and non-interfering resistance values for multiple independent products or multiple test channels. For example, in the complex testing environment of medical devices, the impedance testing requirements of different channels vary. Using only one VR device for rotational or shared adjustment is not only inefficient, but can also distort test results due to mutual interference between resistance values.

[0003] On the other hand, when the circuit involves multi-channel power supply and each channel needs to independently adjust the power supply voltage, some variable resistor devices are difficult to flexibly distribute and stably maintain multiple different voltage levels in the same circuit. This requires the additional configuration of multiple independent variable resistor devices or power supply equipment, which not only increases the complexity and cost of the system, but also increases the wiring difficulty and space occupancy, thereby exacerbating the risk of short circuits caused by interlaced lines. Utility Model Content

[0004] The present application provides a universal multi-contact variable resistance device to solve the problem that the variable resistance device cannot provide multiple resistance values at the same time.

[0005] The present application provides a universal multi-contact variable resistance device, comprising: contacts, a control button, a hierarchical circuit, and a housing; wherein the contacts and the control button are arranged on the outside of the housing, and the hierarchical circuit is arranged inside the housing; a plurality of the contacts are arranged in a horizontal and vertical arrangement, and the control button is arranged between two adjacent contacts;

[0006] The hierarchical circuit includes a first layer circuit, a second layer circuit and a third layer circuit; the first layer circuit includes a first contact and a first connecting post, the second layer circuit includes a second contact and a second connecting post, and the third layer circuit includes a third contact and a third connecting post; a fourth connecting post is provided on the bottom surface of the cover;

[0007] The first connecting post, the second connecting post, the third connecting post, and the fourth connecting post are respectively connected end to end through a connecting groove; the first contact point, the second contact point, and the third contact point are respectively disposed in the connecting groove;

[0008] One of the contacts is connected to the top ends of the plurality of first connecting pillars, two adjacent second contacts corresponding to two adjacent contacts are electrically connected, and a resistor is electrically connected between two adjacent third contacts corresponding to two adjacent contacts;

[0009] A guide wire is sleeved on the outer side of each first connecting column, the top end of the guide wire is electrically connected to the contact, and the bottom end of the guide wire is connected to the control button; the display state of the control button includes a first display state, a second display state and a third display state. When the control button is in the first display state, the second display state and the third display state respectively, the bottom end of the guide wire enters the connecting groove and is electrically connected to the first contact, the second contact and the third contact respectively.

[0010] The device is configured with a plurality of contacts and control buttons, and multiple hierarchical circuits are provided to enable the control buttons to be in different display states. During use, by connecting different contacts and pressing the control buttons, different resistance values can be obtained through series connection, parallel connection, or series-parallel connection. Furthermore, different resistance values can be provided simultaneously for multiple products or circuits without interrupting power.

[0011] Optionally, the resistance between two adjacent second contact points corresponding to two adjacent contacts is equal to 0, and the resistance of the resistor is greater than 0.

[0012] Optionally, a card is provided on the side of the top of the second connecting post and the top of the third connecting post away from the connecting groove, and the card is elastically connected to the second connecting post and the third connecting post respectively.

[0013] Optionally, the connecting groove includes a first horizontal portion and a first inclined portion, the first horizontal portion is respectively arranged between the first connecting column and the second connecting column, between the second connecting column and the third connecting column, and between the third connecting column and the fourth connecting column, and the first inclined portion is inclined toward the direction close to the top surface of the cover shell.

[0014] Optionally, two connecting lines are provided at the bottom of the control button, and the ends of the two connecting lines away from the control button are respectively connected to the bottom ends of the guide wires. The control button drives the bottom of the guide wire to slide along the outer sides of the first connecting column, the second connecting column and the third connecting column through the connecting lines.

[0015] Optionally, a spring is provided inside the control button, one end of the spring is connected to the two connecting lines respectively, and the control button selects the display state through the spring.

[0016] Optionally, the control button includes three lighting colors, and the three lighting colors correspond to the first display state, the second display state and the third display state respectively.

[0017] Optionally, a fuse is further included, one end of the fuse is electrically connected to the contact, and the other end of the fuse is connected to the top end of the first connecting column and electrically connected to the top end of the guide wire.

[0018] Optionally, it further includes a variable resistance knob and a control component, and the variable resistance knob is electrically connected to the third layer circuit through the control component.

[0019] The present application provides a universal multi-contact variable resistor device, comprising: contacts, control buttons, hierarchical circuits and a cover. Several contacts are arranged in a horizontal and vertical arrangement, and a control button is provided between two adjacent contacts. The hierarchical circuit comprises a first layer circuit, a second layer circuit and a third layer circuit, each layer circuit comprises a connecting column and a contact, and each contact is respectively connected to a plurality of connecting columns, and a contact is provided between two adjacent connecting columns, and the contacts corresponding to the two adjacent contacts are electrically connected or disconnected. A guide wire is sleeved on the connecting column, and the control button is connected to the guide wire. Pressing the control button can control the guide wire to be electrically connected to different hierarchical circuits. By connecting different contacts and pressing the control button between the contacts, different resistance values can be obtained in series, parallel or series-parallel manner, and different resistance values can be provided for multiple products or circuits at the same time without power outage, which can solve the problem that the variable resistor device cannot provide multiple resistance values at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic structural diagram of a universal multi-contact variable resistor device provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a top view of the structure of a universal multi-contact variable resistor device provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of a cross-sectional structure in the direction of A provided in an embodiment of the present application;

[0024] Figure 4 This is an enlarged schematic diagram of point B provided in an embodiment of the present application;

[0025] Figure 5 This is an enlarged schematic diagram of point C provided in an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the connection slot structure provided in an embodiment of the present application.

[0027] Illustration:

[0028] Among them, 1-contact; 101~108-contacts; 2-control button; 31-first layer circuit; 311-first contact; 312-first connecting column; 32-second layer circuit; 321-second contact; 322-second connecting column; 33-third layer circuit; 331-third contact; 332-third connecting column; 34-connecting slot; 36-fourth connecting column; 4-cover; 5-resistance knob; 7-control component; 8-fuse. DETAILED DESCRIPTION

[0029] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0030] Because some variable resistor devices cannot provide accurate and non-interfering resistance values for multiple independent products or multiple test channels at the same time, and when the circuit involves multi-channel power supply and each channel needs to independently adjust the power supply voltage, some variable resistor devices are difficult to flexibly allocate and stably maintain multiple different voltage levels in the same circuit. This requires the additional configuration of multiple independent variable resistor devices or power supply equipment, which not only increases the complexity and cost of the system, but also increases the wiring difficulty and space occupancy, thereby exacerbating the risk of short circuits caused by interlaced lines.

[0031] In order to solve the problem that the variable resistance device cannot provide multiple resistance values at the same time, the embodiment of the present application provides a universal multi-contact variable resistance device, see Figure 1 The device includes: contacts 1, control buttons 2, hierarchical circuits and a cover 4. The contacts 1 and the control buttons 2 are arranged on the outside of the cover 4, and the hierarchical circuits are arranged inside the cover 4. The contacts 1 are conductive and are used to connect to the terminal of a product or circuit. Several contacts 1 are arranged in a horizontal and vertical arrangement, and a control button 2 is provided between two adjacent contacts 1. In some embodiments, when the contacts 1 are arranged in a horizontal and vertical arrangement on the top surface of the cover 4, the spacing may be the same. The cover 4 may be a shell with a rectangular cross-section and may be made of an insulating material.

[0032] See also Figure 3-5The hierarchical circuit includes a first layer circuit 31, a second layer circuit 32, and a third layer circuit 33. In some embodiments, the first layer circuit 31 can be arranged on the top layer, the second layer circuit 32 can be arranged on the middle layer, and the third layer circuit 33 can be arranged on the bottom layer. The first layer circuit 31 includes a first contact 311 and a first connecting post 312, the second layer circuit 32 includes a second contact 321 and a second connecting post 322, and the third layer circuit 33 includes a third contact 331 and a third connecting post 332. A fourth connecting post 36 is provided on the bottom surface of the housing 4. The bottom end of the fourth connecting post 36 can be bonded to the bottom surface of the housing 4 to secure the fourth connecting post 36 to the bottom surface of the housing 4. The first connecting post 312, the second connecting post 322, the third connecting post 332, and the fourth connecting post 36 are all cylindrical structures. The first connecting post 312, the second connecting post 322, the third connecting post 332, and the fourth connecting post 36 are connected end to end via a connecting groove 34, and can be connected by bonding. The first connecting pillar 312 , the second connecting pillar 322 , the third connecting pillar 332 , the fourth connecting pillar 36 and the connecting groove 34 form a framework of the hierarchical circuit.

[0033] One contact 1 is connected to the top ends of multiple first connecting pillars 312. Since the contacts 1 are arranged in a horizontal and vertical arrangement, in some embodiments, there can be four first connecting pillars 312. Each contact 1 then corresponds to four second connecting pillars 322, four third connecting pillars 332, and four fourth connecting pillars 36, respectively, and four first contact points 311, four second contact points 321, and four third contact points 331, respectively. The four first connecting pillars 312 can be evenly arranged along the circumference, with the four connecting grooves 34 between the first connecting pillar 312 and the second connecting pillar 322, the four connecting grooves 34 between the second connecting pillar 322 and the third connecting pillar 332, and the four connecting grooves 34 between the third connecting pillar 332 and the fourth connecting pillar 36 facing in four directions.

[0034] The first, second, and third contacts 311, 321, and 331 are each disposed within the connection slot 34. Each of these contacts 311, 321, and 331 serves to electrically connect the electrical components or conductors of the corresponding hierarchical circuits. Two adjacent second contacts 321 corresponding to two adjacent contacts 1 are electrically connected via a conductor, and two adjacent third contacts 331 corresponding to two adjacent contacts 1 are electrically connected via a conductor to a resistor R1. It can be understood that the hierarchical circuits within the housing 4 form a mesh-like structure. Because there is no connection between the first contacts 311, the resistance of the first circuit layer 31 approaches infinity, representing a disconnected layer. Because adjacent second contacts 321 are only electrically connected, the resistance of the second circuit layer 32 is zero, representing a zero-resistance layer. Because resistor R1 is electrically connected between adjacent third contacts 331, the resistance of resistor R1 is greater than zero, representing a normal-resistance layer.

[0035] A guide wire 35 is sleeved on the outside of each first connecting post 312. The top end of the guide wire 35 is electrically connected to the contact 1, and the bottom end of the guide wire 35 is connected to the control button 2. The guide wire 35 has a spiral structure. In some embodiments, the guide wire 35 can be a soft spring, which is elastic, flexible, and conductive. The control button 2 is a spring-loaded button. The display states of the control button 2 include a first display state, a second display state, and a third display state. Pressing the control button 2 switches the display state. When the control button 2 is in the first display state, the second display state, and the third display state, respectively, the bottom end of the guide wire 35 enters the connecting slot 34 under the action of the control button 2 and electrically connects to the first contact 311, the second contact 321, and the third contact 331, respectively.

[0036] When the control button 2 is in the first display state, the bottom end of the guide wire 35 enters the connecting slot 34 between the first connecting post 312 and the second connecting post 322. Since the two adjacent first contacts 311 are disconnected, the circuit between the two adjacent contacts 1 is disconnected. When the control button 2 is in the second display state, the bottom end of the guide wire 35 enters the connecting slot 34 between the second connecting post 322 and the third connecting post 332. The two adjacent second contacts 321 are electrically connected, resulting in a resistance of zero. A non-resistance path exists between the two adjacent contacts 1. When the control button 2 is in the third display state, the bottom end of the guide wire 35 enters the connecting slot 34 between the third connecting post 332 and the fourth connecting post 36. The two adjacent third contacts 331 are electrically connected to resistor R1. A resistance path exists between the two adjacent contacts 1. When the terminal of a product or circuit is connected to different contacts 1, pressing the control button 2 between the two contacts 1 to be connected causes the control button 2 to enter different display states, thereby providing different resistance values for the product or test circuit.

[0037] For example, the resistance of the resistor R1 can be set to N, see Figure 2 , marking contact 1 from serial number 101 to serial number 108. Connect one end of the product or circuit's terminal to contact 101 and the other end to contact 103, and press the control button 2 between contacts 101 and 103 to the third display state. A resistor with a resistance of 2N can be obtained by connecting them in series. Connect one end of the product or circuit's terminal to contact 101 and the other end to contact 102, or connect one end of the terminal to contact 105 and the other end to contact 106, and press the control button 2 between contacts 101 and 102 and between contacts 105 and 106 to the third display state. Press the control button 2 between contacts 101 and 105 and between contacts 102 and 106 to the second display state. A resistor with a resistance of 0.5N can be obtained by connecting them in parallel. By connecting one terminal of the product or circuit to contact 101 and the other terminal to contact 107 in parallel, and pressing the control button 2 between contacts 105 and 107 to the third display state, a resistor with a resistance of 1.5N can be obtained by connecting in parallel and then in series.

[0038] The above connection method is only an example, and the contact 1 and the control button 2 can be arbitrarily combined to obtain the required resistance value. The device of the present application can also provide different resistance values for multiple products or circuits at the same time. For example, while providing resistance for a product or circuit in the above parallel or series manner, the contact 104 and the contact 108 can be connected to the terminal of another product or circuit, and the control button 2 between the contact 104 and the contact 108 can be pressed to the required display state to provide resistance for another product or circuit. Selecting different contacts 1 to connect to the terminal of a product or circuit can provide different resistance values for the product or circuit. It should also be noted that, Figure 1-3 The number of contacts 1 and control buttons 2 is only an example, and more contacts 1 and control buttons 2 may be provided in the device.

[0039] The device provided herein comprises several contacts 1 and a control button 2. Multiple hierarchical circuits are employed to adjust the control button 2 to different display states. During use, by connecting different contacts 1 and pressing the control button 2, different resistance values can be achieved through series, parallel, or both. Furthermore, without power outages, different resistance values can be provided simultaneously for a variety of products or circuits, resolving the issue of variable resistor devices being unable to simultaneously provide multiple resistance values. Furthermore, the device provided herein has a simple structure and is highly practical.

[0040] In some embodiments, since the first connecting column 312 , the second connecting column 322 , and the third connecting column 332 are not electrically connected to each other, the first connecting column 312 , the second connecting column 322 , the third connecting column 332 , the fourth connecting column 36 , and the connecting slot 34 are all made of insulating materials.

[0041] See again Figure 4-5 , and see Figure 6 The connecting groove 34 includes a first horizontal portion and a first inclined portion, a hollow structure, and the interior is used to set the first contact 311, the second contact 321 and the third contact 331. The top surface and the bottom surface of the first straight portion of the connecting groove 34 are respectively bonded to different connecting columns to connect the first connecting column 312, the second connecting column 322, the third connecting column 332 and the fourth connecting column 36 together end to end. The material of the first contact 311, the second contact 321 and the third contact 331 is a conductor and can conduct electricity. The first contact 311, the second contact 321 and the third contact 331 can be a sheet-like structure, and the external structure can be the same as that of the connecting groove 34, that is, it includes a second straight portion and a second inclined portion, the top of the second inclined portion is used to electrically connect to the adjacent contact, and the second straight portion is used to electrically connect the guide wire 35.

[0042] Two connecting wires are provided at the bottom of the control button 2, and the connecting wires are hard insulating wires. The ends of the two connecting wires away from the control button 2 are respectively connected to the bottom ends of the guide wire 35. The control button 2 drives the bottom of the guide wire 35 to slide along the outside of the first connecting column 312, the second connecting column 322, and the third connecting column 332 through the connecting wires, so that the bottom end of the guide wire 35 can enter the connecting groove 34. It should also be noted that since the first inclined portion of the connecting groove 34 is inclined upward, the side of the guide wire 35 close to the first inclined portion is limited by the first inclined portion, and the other side of the guide wire 35 enters the connecting groove 34 downward. In order to clearly display the internal structure of the device, Figure 1 The example in the figure magnifies the size of each structural component, and the actual height of each connecting column is relatively small. For example, the height of the second connecting column 322 and the third connecting column 332 can be 3 mm, so that the guide wire 35 can enter the connecting groove 34.

[0043] In some embodiments, a clip is disposed on the top of the second connecting post 322 and the top of the third connecting post 332, away from the side of the connecting slot 34. The clip is elastically connected to the second connecting post 322 and the third connecting post 332, respectively. For example, a thin spring can be disposed within the second connecting post 322 and the third connecting post 332, respectively, to elastically connect the clip to the second connecting post 322 and the third connecting post 332. The clip can have a triangular structure and can be used to intercept the guide wire 35 when it slides downward. When the guide wire 35 needs to return upward, the guide wire 35, driven by the connecting line, presses against the clip and is retracted upward through the inclined surface of the clip.

[0044] A spring is provided inside the control button 2, and the control button 2 selects the display state through the spring. The bottom ends of the springs are respectively connected to two connecting wires. When the control button 2 is pressed, the two connecting wires drive the guide wire 35 to slide downward under the elastic force of the springs, and are electrically connected to the contacts in different hierarchical circuits to put the control button 2 in different display states. The control button 2 includes three lighting colors, which correspond to the first display state, the second display state, and the third display state, respectively. In some embodiments, the three lighting colors can be set to green, red, and white, respectively. The first display state can be set to a white light, the second display state to a red light, and the third display state to a green light.

[0045] For example, when the control button 2 is lit white, the control wire 35 of the control button 2 extends downward into the connection slot 34 between the first connection post 312 and the second connection post 322, electrically connecting to the first contact 311 in the connection slot 34. The control button 2 is in the first layer of circuit 31. When the control button 2 is lit red, the control wire 35 of the control button 2 extends downward into the connection slot 34 between the second connection post 322 and the third connection post 332, electrically connecting to the second contact 321 in the connection slot 34. The control button 2 is in the second layer of circuit 32. When the control button 2 is lit green, the control wire 35 of the control button 2 extends downward into the connection slot 34 between the third connection post 332 and the fourth connection post 36, electrically connecting to the third contact 331 in the connection slot 34. The control button 2 is in the third layer of circuit 33.

[0046] By setting different lighting colors for the control button 2, you can intuitively determine which circuit layer the control button 2 is in based on the lighting color, and thus obtain the required resistance value. Since the first layer circuit 31 is a disconnected layer, the lighting color of the first display state can also be set to off to better distinguish the first layer circuit 31.

[0047] In some embodiments, the device further includes a fuse 8, one end of which is electrically connected to the contact 1, and the other end of which is connected to the top of the first connecting column 312 and the top of the guide wire 35. By providing the fuse 8, the hierarchical circuits within the device can be protected and operated safely.

[0048] See again Figure 3In some embodiments, the device further includes a variable resistance knob 5 and a control assembly 7. The variable resistance knob 5 is disposed outside the housing 4, and the control assembly 7 is disposed within the housing 4. The variable resistance knob 5 is electrically connected to the third-layer circuit 33 via the control assembly 7. The variable resistance knob 5 is provided with different resistance levels, such as R×1, R×10, and R×100. Rotating the variable resistance knob 5 selects different resistance levels. The control assembly 7 is used to control the resistance value connected to the third-layer circuit 33, so that the third-layer circuit 33 can change the resistance value of resistor R1 according to the resistance level selected by the variable resistance knob 5. By providing the variable resistance knob 5 and the control assembly 7, the device can further provide more selectable resistance values, expanding the range of resistance selection. It should be noted that the internal structure and spring of the control button 2, the variable resistance knob 5, and the control assembly 7 are all structures that can be obtained through existing technology and are therefore not described in detail in this application.

[0049] When in use, the contact 1 to be connected can be obtained by calculating the resistance value, wherein the contact 1 includes an input contact and an output contact, which are respectively used to connect to the terminal of the product or circuit. It can be understood that since the number of products or circuits to be connected may be greater than 1, the number of contacts 1 to be connected is at least 2. Press the control button 2 between the input contact and the output contact to put the control button 2 in one of the display states. Electrically connect the terminal of the circuit to the input contact and the output contact respectively to obtain the required resistance value. It should be noted that in the embodiment of the present application, the order of the above processes is not strictly distinguished. The terminal can also be connected to the input contact and the output contact respectively, and then the control button 2 is pressed as needed to change the display state of the control button 2. Since obtaining different resistance values by free combination of series connection, parallel connection or series-parallel connection has been explained in the embodiment of the above device, it will not be repeated here.

[0050] As can be seen from the above technical solution, the present embodiment provides a universal multi-contact variable resistor device, comprising: contacts 1, control buttons 2, hierarchical circuits, and a housing 4. Several contacts 1 are arranged horizontally and vertically, with a control button 2 positioned between adjacent contacts 1. The hierarchical circuit comprises a first circuit layer 31, a second circuit layer 32, and a third circuit layer 33. Each circuit layer comprises connecting posts and contacts, and each contact 1 is connected to multiple connecting posts. Contacts are positioned between adjacent connecting posts, and the corresponding contacts of two adjacent contacts 1 are electrically connected or disconnected. A guide wire 35 is sleeved on the connecting post, and a control button 2 is connected to the guide wire 35. Pressing the control button 2 controls the electrical connection of the guide wire 35 to different hierarchical circuits. By connecting different contacts 1 and pressing the control button 2 between contacts 1, different resistance values can be achieved through series, parallel, or series-parallel connections. Furthermore, different resistance values can be provided simultaneously for multiple products or circuits without powering down, resolving the problem of variable resistor devices being unable to provide multiple resistance values simultaneously.

[0051] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A universal multi-contact variable resistance device, characterized in that: include: Contacts (1), control buttons (2), hierarchical circuits, and a cover (4); wherein the contacts (1) and the control buttons (2) are arranged on the outside of the cover (4), and the hierarchical circuits are arranged inside the cover (4); a plurality of the contacts (1) are arranged in a horizontal and vertical arrangement, and the control button (2) is arranged between two adjacent contacts (1); The hierarchical circuit includes a first layer circuit (31), a second layer circuit (32) and a third layer circuit (33); the first layer circuit (31) includes a first contact (311) and a first connecting post (312); the second layer circuit (32) includes a second contact (321) and a second connecting post (322); the third layer circuit (33) includes a third contact (331) and a third connecting post (332); a fourth connecting post (36) is provided on the bottom surface of the cover (4); The first connecting column (312), the second connecting column (322), the third connecting column (332), and the fourth connecting column (36) are respectively connected end to end through a connecting groove (34); the first contact point (311), the second contact point (321), and the third contact point (331) are respectively arranged in the connecting groove (34); One of the contacts (1) is connected to the top ends of the plurality of first connecting columns (312), two adjacent second contacts (321) corresponding to two adjacent contacts (1) are electrically connected, and a resistor is electrically connected between two adjacent third contacts (331) corresponding to two adjacent contacts (1); A guide wire (35) is sleeved on the outer side of each first connecting column (312), the top end of the guide wire (35) is electrically connected to the contact (1), and the bottom end of the guide wire (35) is connected to the control button (2); the display state of the control button (2) includes a first display state, a second display state and a third display state. When the control button (2) is in the first display state, the second display state and the third display state respectively, the bottom end of the guide wire (35) enters the connecting groove (34) and is electrically connected to the first contact (311), the second contact (321) and the third contact (331) respectively.

2. The universal multi-contact variable resistance device according to claim 1, characterized in that: The resistance between two adjacent second contact points (321) corresponding to two adjacent contacts (1) is equal to 0, and the resistance of the resistor is greater than 0.

3. The universal multi-contact variable resistance device according to claim 1, characterized in that: Cards are provided on the sides of the top of the second connecting column (322) and the top of the third connecting column (332) away from the connecting groove (34), and the cards are elastically connected to the second connecting column (322) and the third connecting column (332) respectively.

4. The universal multi-contact variable resistance device according to claim 1, characterized in that: The connecting groove (34) includes a first horizontal portion and a first inclined portion, wherein the first horizontal portion is respectively arranged between the first connecting column (312) and the second connecting column (322), between the second connecting column (322) and the third connecting column (332), and between the third connecting column (332) and the fourth connecting column (36), and the first inclined portion is inclined toward a direction close to the top surface of the cover shell (4).

5. The universal multi-contact variable resistance device according to claim 1, characterized in that: Two connecting lines are provided at the bottom of the control button (2), and one end of the two connecting lines away from the control button (2) is respectively connected to the bottom end of the guide wire (35), and the control button (2) drives the bottom of the guide wire (35) to slide along the outer sides of the first connecting column (312), the second connecting column (322), and the third connecting column (332) through the connecting lines.

6. The universal multi-contact variable resistance device according to claim 5, characterized in that: A spring is provided inside the control button (2), one end of the spring is respectively connected to the two connecting lines, and the control button (2) selects the display state through the spring.

7. The universal multi-contact variable resistance device according to claim 1, characterized in that: The control button (2) includes three lighting colors, and the three lighting colors correspond to the first display state, the second display state and the third display state respectively.

8. The universal multi-contact variable resistance device according to claim 1, characterized in that: It also includes a fuse (8), one end of which is electrically connected to the contact (1), and the other end of which is connected to the top of the first connecting column (312) and electrically connected to the top of the guide wire (35).

9. The universal multi-contact variable resistance device according to claim 1, characterized in that: It also includes a variable resistance knob (5) and a control component (7), wherein the variable resistance knob (5) is electrically connected to the third layer circuit (33) via the control component (7).

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