High-precision adjustable resistor

Abstract

The utility model discloses a high-precision adjustable resistor. The high-precision adjustable resistor comprises a plurality of value selection resistor modules which are connected in series, a plurality of resistors are arranged between the input end and the output end of each value selection resistor module in a series connection or parallel connection mode, and the resistance value of the value selection resistor module can be switched and adjusted between zero and the maximum resistance value in a grading mode through switching selection of the selection switch. The resistance value adjusting ranges of the value selection resistor modules are set in a grading manner, so that the total resistance value of the resistor can be accurately adjusted after the value selection of the value selection resistor modules is respectively switched. According to the high-precision adjustable resistor disclosed by the utility model, higher-precision and quicker resistance adjustment is realized, so that the production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to an electrical device, and more particularly to a resistor. Background Technology

[0002] An adjustable resistor, also known as a potentiometer, is an electrical component that allows for adjustment of its resistance value. Current adjustable resistors typically consist of a resistive element and a movable contact (moving contact). The resistance value is changed by altering the position of the contact on the resistive element. This adjustment can be achieved through rotation or sliding control, making adjustable resistors widely used in electronic circuits. In our industrial production, many scenarios require the use of high-precision resistive components for testing, production, and other processes. However, traditional rotary or sliding adjustable resistors have the following drawbacks:

[0003] 1. Compared to some high-precision industrial requirements, the resistance value accuracy is still relatively low, the adjustment error is relatively large, and it is difficult to make precise value adjustment.

[0004] 2. When adjusting the resistance value, the value cannot change linearly, which brings a lot of tedious back-and-forth operations to the debugging, affecting both work efficiency and work quality. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a high-precision adjustable resistor, which enables higher precision and faster resistance adjustment, thereby greatly improving production efficiency.

[0006] To solve this technical problem, the technical solution adopted by this utility model is as follows:

[0007] A high-precision adjustable resistor includes several selectable resistor modules, which are connected in series.

[0008] Each of the selected resistor modules has several resistors connected in series or in parallel between its input and output terminals. By switching the selector switch, the resistance value of the selected resistor module can be adjusted in stages from zero to the maximum resistance value.

[0009] The resistance adjustment ranges of the several selected resistor modules are set in different ranges, so that by switching the selected values ​​of the several selected resistor modules respectively, the total resistance value of the resistor can be precisely adjusted.

[0010] Furthermore, one of the selected resistor modules is responsible for adjusting one of the digital resistance values ​​of the resistor; the adjustable resistance value of each selected resistor module is divided into ten equal levels between zero and the maximum resistance value, namely level zero, level one, level two, level three, level four, level five, level six, level seven, level eight and level nine.

[0011] Furthermore, the input and output terminals of the selectable resistor module are connected in parallel with ten branch circuits. One branch circuit has no resistor. The remaining nine branch circuits are connected in series with resistors of different resistance values. The resistance values ​​of the nine branch circuits are the first to ninth level resistance values ​​of the digital resistance value adjusted by the selectable resistor module. Each branch circuit is equipped with a selection switch. The selection switch is used to select and connect one of the ten branch circuits, so that the resistance value of the selectable resistor module is one of the ten resistance values ​​from level zero to level nine.

[0012] Furthermore, the resistor is provided with ten selectable resistor modules, and the maximum resistance values ​​of the ten selectable resistor modules are 0.9Ω, 9Ω, 90Ω, 900Ω, 9KΩ, 90KΩ, 900KΩ, 9MΩ, 90MΩ, and 900MΩ, respectively.

[0013] Furthermore, a main circuit is provided between the input and output terminals of the selectable resistor module. Nine resistors of equal value are connected in series on the main circuit. The resistance value of the resistors connected in series on the main circuit is the first-level resistance value corresponding to the resistance value adjusted by the selectable resistor module. At the same time, the selectable resistor module is also provided with a short-circuit circuit. The selector switch can switch between not short-circuiting the resistors connected in series on the main circuit or short-circuiting one or more series resistors on the main circuit, so that the resistance value of the selectable resistor module is one of the ten resistance values ​​from level zero to level nine.

[0014] Furthermore, the short-circuit circuit is specifically configured such that nine short-circuit branches are provided between the input and output terminals of each of the selected resistor modules, which can respectively short-circuit one, two, three, four, five, six, seven, eight, or nine resistors on the main circuit. Each of the short-circuit branches is connected in series with a selection switch. When all selection switches are not connected or one of them is selected to be connected, the resistance value of the corresponding selected resistor module is made to be one of the ten resistance values ​​from level zero to level nine.

[0015] Furthermore, the resistor is provided with ten selectable resistor modules, and the resistance values ​​of the resistors connected in series on the main circuit in the ten selectable resistor modules are 0.1Ω, 1Ω, 10Ω, 100Ω, 1KΩ, 10KΩ, 100KΩ, 1MΩ, 10MΩ, and 100MΩ, respectively.

[0016] Furthermore, the selector switch can be a toggle switch, rotary switch, jumper cap, or relay.

[0017] Furthermore, several selectable resistor modules are mounted on a PCB board.

[0018] Furthermore, the resistor includes a housing, the PCB board is fixedly disposed within the housing, and the housing is filled with potting compound.

[0019] In production practice and testing, the high-precision adjustable resistor of this invention can achieve higher precision and faster resistance adjustment. The resistance adjustment accuracy can quickly and accurately reach 0.1Ω or even higher, without deviation and without the need for repeated adjustments and corrections, thus greatly improving production efficiency.

[0020] To modularize and miniaturize the entire adjustable resistor, we can mount the selectable resistor module on a single PCB board, including the connection circuits between modules. This results in a small, stable, and reliable adjustable resistor. Furthermore, the PCB board is fixed within a housing filled with potting compound. This potting compound provides added protection, ensuring the resistor is unaffected by ambient temperature and humidity. This makes the adjustable resistor even more stable and reliable, adaptable to a wider range of operating environments, even relatively harsh ones. Attached Figure Description

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the high-precision adjustable resistor of this utility model.

[0023] Figure 2 This is a schematic diagram of a resistor module with selected values ​​using series resistors.

[0024] Figure 3 This is one of the schematic diagrams of the operation panel for an adjustable resistor, with a resistance value of 0Ω.

[0025] Figure 4 This is the second schematic diagram of the operation panel for an adjustable resistor, with a resistance value of 8503625.6Ω.

[0026] Figure 5 This is a schematic diagram of a resistor module with selected values ​​using series resistors and a multi-contact rotary switch.

[0027] Figure 6 This is a schematic diagram of a resistor module with selected values ​​using parallel resistors.

[0028] Figure 7 This is a schematic diagram of a resistor module that allows you to adjust the resistance value of the resistor by 10Ω (tens-digit value).

[0029] In the picture:

[0030] 10. Value-selecting resistor module

[0031] R, the equivalent resistor connected in series on the main circuit of the selected resistor module.

[0032] k1-k8, in the selector resistor module using series resistors, are selection switches respectively set on the nine short-circuit branches.

[0033] R1-R9 are resistors that are set on the nine branch circuits respectively in the parallel resistor selection module.

[0034] In the selection resistor module using parallel resistors (K1-K9), the selection switches are respectively set on the ten branch circuits. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0036] First set of embodiments

[0037] Figure 1 A high-precision adjustable resistor is shown, comprising ten selectable resistor modules 10 connected in series. The maximum resistance values ​​of the ten selectable resistor modules 10 are set in stages, so that the overall resistance value of the resistor can be adjusted in stages by switching the selection values ​​of the ten selectable resistor modules individually.

[0038] The resistance values ​​of the resistors R connected in series on the main circuit of the ten selectable resistor modules 10 are 0.1Ω, 1Ω, 10Ω, 100Ω, 1KΩ, 10KΩ, 100KΩ, 1MΩ, 10MΩ, and 100MΩ, respectively.

[0039] One of the selected resistor modules 10 is responsible for adjusting one of the digital resistance values ​​of the resistor. The adjustable resistance value of each selected resistor module 10 is divided into ten equal levels from zero to the maximum resistance value, namely level 0, level 1, level 2, level 3, level 4, level 5, level 6, level 7, level 8, and level 9. For example, if the selected resistor module 10 is responsible for adjusting the tens digit resistance value of the resistor, that is, if the resistance value of the resistor R connected in series on the main circuit of the selected resistor module 10 is 10Ω, the adjustable resistance values ​​obtained by the selected resistor module 10 are: level 0 (0Ω), level 1 (10Ω), level 2 (20Ω), level 3 (30Ω), level 4 (40Ω), level 5 (50Ω), level 6 (60Ω), level 7 (70Ω), level 8 (80Ω), and level 9 (90Ω).

[0040] like Figure 2As shown, a main circuit is provided between the input and output terminals of each selected resistor module 10. Nine resistors R of equal value are connected in series on the main circuit. The resistance value of the resistor R connected in series on the main circuit is the first-level resistance value corresponding to the resistance value adjusted by the selected resistor module 10. That is, if the selected resistor module 10 adjusts the resistance value of the resistor to the tens digit, then the resistance value of the resistor R connected in series on the main circuit is 10Ω.

[0041] Meanwhile, the selectable resistor module 10 is also provided with a short-circuit circuit. Through the selection switch (k0-k8), it is possible to switch between not short-circuiting the resistor R connected in series on the main circuit, or short-circuiting one or more series resistors R on the main circuit, so that the resistance value of the selectable resistor module 10 is one of the ten resistance values ​​from level zero to level nine.

[0042] Specifically, such as Figure 2 As shown, each of the selectable resistor modules 10 has nine short-circuit branches between its input and output terminals, which can short-circuit one, two, three, four, five, six, seven, eight, or nine resistors R in the main circuit, respectively. Each short-circuit branch is connected in series with a selector switch (k0-k8). When all selector switches are not connected, or when only one of the switches is selected to be connected, the resistance value of the selectable resistor module 10 is correspondingly set as follows:

[0043] Taking the selectable resistor module 10, which adjusts the resistance value of the tens digit of the resistor by 10Ω, as an example, when all selector switches (k0-k8) are not connected, the resistance value of the selectable resistor module 10 is nine levels (i.e., 90Ω). When one resistor R is short-circuited, it is eight levels (i.e., when k8 is connected, the resistance value of the selectable resistor module 10 is 80Ω). When two resistors R are short-circuited, it is seven levels (i.e., when k7 is connected, the resistance value of the selectable resistor module 10 is 70Ω), ..., when eight resistors R are short-circuited, it is one level (i.e., when k1 is connected, the resistance value of the selectable resistor module 10 is 10Ω). When nine resistors R are short-circuited, it is zero levels (i.e., when k0 is connected, the resistance value of the selectable resistor module 10 is 0Ω).

[0044] The selector switches (k0-k8) can be toggle switches, jumper caps, or relays, or k0-k8 can be integrated into a rotary switch. When the selector switches use relays, the corresponding relays can be controlled by the central controller to achieve automated adjustment functions.

[0045] As a simple and intuitive implementation method, we can use a jumper cap. Figure 3The control panel of the resistor is shown, displaying interfaces for different digital resistance values ​​controlled by different selectable resistor modules 10. Each digital display block has ten sets of selection switch pins, corresponding to the selection switches k0-k8 for resistance values ​​from zero to eight levels, and the short-circuit neutral position for the ninth resistance level of the selectable resistor module 10. Each selectable resistor module 10 is equipped with a jumper cap, which is normally inserted at the zero resistance level position, such as... Figure 3 As shown, the total resistance of the resistors is 0Ω at this time.

[0046] When we need to set the resistance value of a resistor to a specific value, we simply need to insert the jumper cap of the selector resistor module 10 corresponding to the resistance value digits onto a set of selector switch pins for the corresponding resistance value. Figure 4 As shown, the resistance value of the resistor can be made to be 8503625.6Ω.

[0047] The jumper cap is very intuitive and easy to operate, and the selection of resistance values ​​for each digit is very clear, making it less likely to cause operational errors or mistakes.

[0048] As another implementation of the selection switch, such as Figure 5 As shown, we can use a multi-contact rotary switch, which essentially integrates the above k0-k8 and a short-circuit neutral position "9" into a multi-contact rotary switch, and can connect the 0-9 positions as needed.

[0049] To achieve greater portability, compact size, and stable performance, the aforementioned selectable resistor module 10 is mounted on a PCB board. The resistor has a housing, the PCB board is fixedly mounted within the housing, and the housing is filled with potting compound.

[0050] The aforementioned resistor is equipped with ten selectable resistor modules 10, each used to adjust the resistor value from 0.1 digits to hundreds of mega-digits in Ω. Depending on the design, the resistor can have fewer or more selectable resistor modules 10, thereby obtaining resistors with different resistance ranges and adjustable resistance precision. For example, to increase the adjustment precision, selectable resistor modules 10 with a value of ×0.01Ω or even ×0.001Ω can be added; to increase or decrease the adjustment range, higher-digit selectable resistor modules 10 can be added or removed.

[0051] Second set of embodiments

[0052] In the above embodiments, the selected resistor module 10 adopts a series equivalent resistor scheme. In this set of embodiments, the technical problem can also be solved by using a parallel resistor.

[0053] Similarly, the high-precision adjustable resistor includes ten selectable resistor modules 10, which are connected in series. The maximum resistance values ​​of the ten selectable resistor modules 10 are set in stages, so that the overall resistance value of the resistor can be adjusted in stages by switching the values ​​of the ten selectable resistor modules.

[0054] like Figure 6 As shown, the input and output terminals of the selectable resistor module 10 are connected in parallel with ten branch circuits. One branch circuit has no resistor. The remaining nine branch circuits are connected in series with resistors of different values ​​(R1-R9). The resistance values ​​of the resistors (R1-R9) on the nine branch circuits are the first to ninth level resistance values ​​of the digital resistance value adjusted by the selectable resistor module 10. Each branch circuit is provided with a selection switch (K0-K9). By selecting (K0-K9) to connect one of the ten branch circuits, the resistance value of the selectable resistor module is one of the ten resistance values ​​from level zero to level nine.

[0055] Taking the selectable resistor module 10, which adjusts the resistance value of the tens digit of the resistor by 10Ω, as an example, Figure 7 As shown, the normal state can be that the selector switch K0 is closed, at which time the resistance of the selector resistor module 10 is zero-level resistance (i.e., 0Ω); when only the selector switch K5 is closed, the resistance of the selector resistor module 10 is five-level resistance (i.e., 50Ω); when only the selector switch K8 is closed, the resistance of the selector resistor module 10 is eight-level resistance (i.e., 80Ω).

[0056] Similarly, the selector switches (K0-K9) can be toggle switches, jumper caps, or relays, or K0-K9 can be integrated into a rotary switch.

[0057] In the above embodiment, the adjustable resistor includes ten selectable resistor modules 10. The resistance adjustment digits of each selectable resistor module 10 are 0.1Ω to 100MΩ (that is, the resistance adjustment range of the resistor is 0.1Ω to 999,999,999.9Ω, and the adjustment accuracy is 0.1Ω). In order to obtain different resistance adjustment ranges, the resistance adjustment digits of the selectable resistor module 10 can also be 1Ω to 1GΩ (that is, the resistance adjustment range of the resistor is 1Ω to 9,999,999,999Ω, and the adjustment accuracy is 1Ω). Of course, other numbers of selectable resistor modules 10 can also be selected as needed to obtain different resistance adjustment ranges and adjustment accuracies.

[0058] Similarly, the selectable resistor module 10 may not follow the zero-to-nine grade classification. For example, if the ×0.1Ω selectable resistor module 10 is divided into five grades: 0.0Ω, 0.2Ω, 0.4Ω, 0.6Ω, and 0.8Ω, then the adjustment accuracy of the resistor is 0.2Ω.

[0059] In the above embodiments, one of the selected resistor modules 10 is responsible for adjusting one of the digital resistance values ​​of the resistor. Due to the needs of certain specific usage environments, the selected resistor modules 10 may not be divided according to the digital resistance value of the resistor. Instead, the resistance adjustment range of several selected resistor modules 10 may be set according to special requirements. This allows for precise and quick adjustment of the total resistance value of the resistor by switching the selected values ​​of several selected resistor modules 10.

[0060] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A high-precision adjustable resistor, characterized in that: It includes several selectable resistor modules, and the several selectable resistor modules are connected in series; Each of the selected resistor modules has several resistors connected in series between its input and output terminals. By switching the selector switch, the resistance value of the selected resistor module can be adjusted in stages from zero to the maximum resistance value. The resistance adjustment ranges of the several selected resistor modules are set in different ranges, so that by switching the selected values ​​of the several selected resistor modules respectively, the total resistance value of the resistor can be precisely adjusted. One of the selected resistor modules is responsible for adjusting one of the digital resistance values ​​of the resistor; the adjustable resistance value of each selected resistor module is divided into ten equal levels between zero and the maximum resistance value, namely level zero, level one, level two, level three, level four, level five, level six, level seven, level eight and level nine; A main circuit is provided between the input and output terminals of the selectable resistor module. Nine resistors of equal value are connected in series on the main circuit. The resistance value of the resistors connected in series on the main circuit is the first-level resistance value corresponding to the resistance value adjusted by the selectable resistor module. At the same time, the selectable resistor module is also provided with a short-circuit circuit. The selector switch can switch between not short-circuiting the resistors connected in series on the main circuit or short-circuiting one or more series resistors on the main circuit, so that the resistance value of the selectable resistor module is one of the ten resistance values ​​from level zero to level nine. The short-circuit circuit is specifically configured such that nine short-circuit branches are provided between the input and output terminals of each selected resistor module, which can short-circuit one, two, three, four, five, six, seven, eight, or nine resistors on the main circuit, respectively. Each short-circuit branch is equipped with a selection switch in series. When all selection switches are not connected or one of them is selected to be connected, the resistance value of the corresponding selected resistor module is made to be one of the ten resistance values ​​from level zero to level nine.

2. The resistor according to claim 1, characterized in that: The resistor is provided with ten selectable resistor modules, and the resistance values ​​of the resistors connected in series on the main circuit in the ten selectable resistor modules are 0.1Ω, 1Ω, 10Ω, 100Ω, 1KΩ, 10KΩ, 100KΩ, 1MΩ, 10MΩ, and 100MΩ, respectively.

3. The resistor according to claim 1, characterized in that: The selector switch can be a toggle switch, rotary switch, jumper cap, or relay.

4. The resistor according to any one of claims 1 to 3, characterized in that: Several selectable resistor modules are mounted on a PCB board.

5. The resistor according to claim 4, characterized in that: The resistor includes a housing, the PCB board is fixedly mounted inside the housing, and the housing is filled with potting compound.

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