CN114974769B - Fixed value digital potentiometer - Google Patents
Fixed value digital potentiometer Download PDFInfo
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- CN114974769B CN114974769B CN202210625948.0A CN202210625948A CN114974769B CN 114974769 B CN114974769 B CN 114974769B CN 202210625948 A CN202210625948 A CN 202210625948A CN 114974769 B CN114974769 B CN 114974769B
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Abstract
The invention relates to a fixed value digital potentiometer, comprising: the high-voltage double-throw switch comprises a high end, a low end, an adjusting end, a first resistor, a second resistor and N single-pole double-throw switches which are connected in parallel, wherein the first resistor is connected between the high end and the adjusting end, the second resistor is connected between the adjusting end and the low end, each single-pole double-throw switch comprises a first branch, a second branch and a third branch, the first end of the first branch is connected with the high end, the first end of the second branch is connected with the adjusting end, the first end of the third branch is connected with the low end, at least two branches of the first branch, the second branch and the third branch are respectively provided with branch resistors, and the second end of the first branch, the second end of the second branch and the second end of the third branch serve as three movable connecting ends of the single-pole double-throw switch; different switch connections are performed through N single-pole double-throw switches, and different resistances are output between the high end and the low end. The invention improves the output precision of the potentiometer.
Description
Technical Field
The invention relates to the technical field of potentiometers, in particular to a constant value digital potentiometer.
Background
The potentiometer is a resistor element with three leading-out ends and the resistance value of the resistor element can be adjusted according to a certain change rule. Potentiometers are generally composed of a resistor body and a movable brush. When the brush moves along the resistor, a resistance value or voltage which has a certain relation with the displacement is obtained at the output end.
Existing potentiometers can be divided into two categories: mechanical potentiometers and digital potentiometers.
The mechanical potentiometer is a variable resistor. At present, the screw driver is mainly used for analog adjustment, the cost of the mode is high, human errors exist, and the mode is difficult to adjust to a desired value. The slider is connected to a resistive element, the resistance of which changes as it moves along the length of the element. To ensure reliable operation of the device, the sliding end must remain in good contact with the resistive element during the product lifetime. Mechanical connections are inherently susceptible to vibration, shock, humidity, pressure, etc., and thus the accuracy of adjustment is not ideal. The adjustment times of the mechanical potentiometer are limited to the structure, and are generally only thousands or hundreds of times, which are not enough to meet the requirements in many cases.
Mechanical potentiometers are also advantageous because the resolution of the mechanical potentiometers is virtually unlimited, but the actual effect depends on the proficiency of the adjusting personnel. Specific proficiency will vary from person to person, and different results will be obtained at different times.
Compared with the traditional mechanical potentiometer, the digital potentiometer has obvious advantages, firstly, the writing times of the digital potentiometer are not limited by the structure, the resolution of the digital potentiometer provided in the market at present is 32-level to 256-level or higher, and secondly, the digital potentiometer is far stronger in sensitivity than the mechanical potentiometer because the traditional mechanical potentiometer is insensitive to dust, dirt and moist environment.
Besides the advantages, the existing digital potentiometer has the defects of high rated blocking error, high temperature coefficient, narrow pass frequency band, small allowable current of a sliding end and the like, so that the application of the existing digital potentiometer is limited to a great extent.
Disclosure of Invention
The invention aims to provide a constant value digital potentiometer, which improves the output precision of the potentiometer.
In order to achieve the above object, the present invention provides the following solutions:
a constant value digital potentiometer comprising: the high-voltage double-throw switch comprises a high end, a low end, an adjusting end, a first resistor, a second resistor and N single-pole double-throw switches which are connected in parallel, wherein the first resistor is connected between the high end and the adjusting end, the second resistor is connected between the adjusting end and the low end, each single-pole double-throw switch comprises a first branch, a second branch and a third branch, the first end of the first branch is connected with the high end, the first end of the second branch is connected with the adjusting end, the first end of the third branch is connected with the low end, branch resistors are respectively arranged in at least two branches of the first branch, the second end of the second branch and the second end of the third branch, and the third branch serve as three movable connecting ends of the single-pole double-throw switch; different switch connections are performed through N single-pole double-throw switches, and different resistances are output between the high end and the low end.
Optionally, the branch resistor includes a first branch resistor and a second branch resistor, where the first branch in each single-pole double-throw switch is a pole in the single-pole double-throw switch, a second end of the first branch is used to connect with a second end of the second branch or connect with a second end of the third branch, the first branch resistor is disposed on the first branch, and the second branch resistor is disposed on the second branch.
Optionally, a third branch resistor is further included, and the third branch resistor is disposed on the third branch.
Optionally, the branch resistor includes a first branch resistor and a third branch resistor, where the first branch in each single-pole double-throw switch is a pole in the single-pole double-throw switch, a second end of the first branch is used to connect with a second end of the second branch or connect with a second end of the third branch, the first branch resistor is disposed on the first branch, and the third branch resistor is disposed on the third branch.
Optionally, the branch resistor includes a first branch resistor and a second branch resistor, where the second branch in each single-pole double-throw switch is a pole in the single-pole double-throw switch, and a second end of the second branch is used to connect with a second end of the first branch or connect with a second end of the third branch, the first branch resistor is disposed on the first branch, and the second branch resistor is disposed on the second branch.
Optionally, the branch resistors include a second branch resistor and a third branch resistor, the second branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, a second end of the second branch is used for being connected with a second end of the first branch or a second end of the third branch, the second branch resistor is arranged on the second branch, and the third branch resistor is arranged on the third branch.
Optionally, the circuit further comprises a first branch resistor, and the first branch resistor is arranged on the first branch.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a fixed value digital potentiometer, which is characterized in that the appearance of the digital potentiometer is kept by improving the internal structure, different switch connections are carried out through N single-pole double-throw switches by utilizing the characteristics of the single-pole double-throw switches, different resistors are output between a high end and a low end, and the accurate output of the potentiometer is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a constant value digital potentiometer according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a single pole double throw switch in embodiment 1 of the present invention;
FIG. 3 is a diagram showing a constant value digital potentiometer according to embodiment 2 of the present invention;
FIG. 4 is a diagram showing a constant value digital potentiometer according to embodiment 3 of the present invention;
FIG. 5 is a diagram showing a constant value digital potentiometer according to embodiment 4 of the present invention;
FIG. 6 is a diagram showing a constant value digital potentiometer according to embodiment 5 of the present invention;
FIG. 7 is a diagram showing a constant value digital potentiometer according to embodiment 6 of the present invention;
FIG. 8 is a diagram showing a constant value digital potentiometer according to embodiment 7 of the present invention;
FIG. 9 is a diagram showing a constant value digital potentiometer according to embodiment 8 of the present invention;
fig. 10 is a schematic diagram of a constant value digital potentiometer according to embodiment 9 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a constant value digital potentiometer, which improves the output precision of the potentiometer.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
Fig. 1 is a schematic structural diagram of a constant value digital potentiometer according to embodiment 1 of the present invention, as shown in fig. 1, a constant value digital potentiometer includes: high end (A end), low end (C end), regulating end (B end), first resistor R u A second resistor R d And N single-pole double-throw switches (SP 1, SP2, …, SPN) connected in parallel, wherein a first resistor is connected between the high end and the regulating end, a second resistor is connected between the regulating end and the low end, and each single-pole double-throw switchThe single-pole double-throw switch comprises a first branch, a second branch and a third branch, wherein the first end of the first branch is connected with a high end, the first end of the second branch is connected with an adjusting end, the first end of the third branch is connected with a low end, at least two branches of the first branch, the second branch and the third branch are respectively provided with branch resistors, and the second end of the first branch, the second end of the second branch and the second end of the third branch are used as three movable connecting ends of the single-pole double-throw switch; different switch connections are carried out through N single-pole double-throw switches, different resistances are output between the high end and the low end, and different resistances are output between the regulating end and the low end.
Vc represents the voltage between the A terminal and the C terminal, and Vb represents the voltage between the B terminal and the C terminal.
When the fixed-value digital potentiometer is used as an output resistor and a plurality of resistance values are required to be obtained, the position and the number of the single-pole double-throw switch of the fixed-value digital potentiometer can be adjusted, and when the position and the number are unchanged, two groups of values can be output because the resistance values obtained by Vc and Vb are different. Because the value of the resistance value is already controlled by the switch, the constant value digital potentiometer can output two required resistance values at the moment.
The single-pole double-throw switch is commonly used for debugging large-scale mechanical equipment, and the single-pole double-throw switch is used for resistance adjustment.
In the constant value digital potentiometer circuit, a single-pole double-throw switch can control a single circuit, and one switch can control multiple paths.
A single pole double throw switch is a special switch structure. The single pole double throw switch control can simultaneously control the working states of two devices, and the working states of the two devices are opposite. For example, a single pole double throw switch is connected to device a and device B, device a will be in an on state, and if the single pole double throw switch is off, device B is off; conversely, if the single pole double throw switch is open, device a will be in the off state and device B will be open. Thus, it is known that only one device will be turned on no matter what state the single pole double throw switch is in.
The invention uses the characteristic of single pole double throw to control multiple paths in the circuit simultaneously.
As shown in FIG. 2, the structure of a single-pole double-throw switch is that the single-pole double-throw switch is connected left and right and has two different resistance values, when the switch at the position of the knife SP1 is connected left, the resistance between the A end and the B end is equal to R 1 SPa +R 1 SPb The method comprises the steps of carrying out a first treatment on the surface of the When the switch at the knife SP1 is connected to the right, the resistance between the A end and the C end is R 1 SPa 。
The branch resistors comprise a first branch resistor and a second branch resistor, a first branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the first branch is used for being connected with the second end of the second branch or the second end of the third branch, the first branch resistor is arranged on the first branch, and the second branch resistor is arranged on the second branch. When the second end of the first branch is not connected with the second end of the second branch and the second end of the third branch, the single-pole double-throw switch is in an off state.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switches (the second end of the first branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPa +R i SPb (the sum of the first and second branch resistances); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the first branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPa (first branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
R T representing the resistance between the a terminal and the C terminal.
Wherein R is Lower part(s) Representing the resistance between the B terminal and the C terminal and R T Is a ratio of (2).
Example 2
As shown in fig. 3, the branch resistors include a first branch resistor and a third branch resistor, the first branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the first branch is used for connecting the second end of the second branch or connecting the second end of the third branch, the first branch resistor is arranged on the first branch, and the third branch resistor is arranged on the third branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switches (the second end of the first branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPa (first branch resistance); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the first branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPa +R j SPc (the sum of the first branch resistance and the third branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 3
As shown in fig. 4, the branch resistors include a first branch resistor, a second branch resistor and a third branch resistor, wherein the second branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the second branch is used for connecting the second end of the first branch or the second end of the third branch, the first branch resistor is arranged on the first branch, the second branch resistor is arranged on the second branch, and the third branch resistor is arranged on the third branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switches (the second end of the first branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPa +R i SPb (the sum of the first and second branch resistances); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the first branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPa +R j SPc (the sum of the first branch resistance and the third branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 4
As shown in fig. 5, the branch resistors include a first branch resistor and a second branch resistor, the second branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the second branch is used for connecting the second end of the first branch or the second end of the third branch, the first branch resistor is arranged on the first branch, and the second branch resistor is arranged on the second branch. When the second end of the second branch is not connected with the second end of the first branch and the second end of the third branch, the single-pole double-throw switch is in an off state.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the second branch is connected with the second end of the first branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPa +R i SPb (the sum of the first and second branch resistances); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the second branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPb (second branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 5
As shown in fig. 6, the branch resistors include a second branch resistor and a third branch resistor, the second branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the second branch is used for connecting the second end of the first branch or the second end of the third branch, the second branch resistor is arranged on the second branch, and the third branch resistor is arranged on the third branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the second branch is connected with the second end of the first branch), a resistor set is formed, and the number of elements in the resistor set is thatM is R as element i SPb (second branch resistance); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the second branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPb +R j SPc (the sum of the second and third branch resistances).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 6
As shown in fig. 7, the branch resistors include a first branch resistor, a second branch resistor and a third branch resistor, wherein the second branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the second branch is used for connecting the second end of the first branch or connecting the second end of the third branch, the second branch resistor is arranged on the second branch, the third branch resistor is arranged on the third branch, and the first branch resistor is arranged on the first branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the second branch is connected with the second end of the first branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPa +R i SPb (the sum of the first and second branch resistances); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the second branch is connected with the second end of the third branch), wherein the number of elements in the set is N-M, and the elements are R j SPb +R j SPc (the sum of the second and third branch resistances).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 7
As shown in fig. 8, the branch resistors include a second branch resistor and a third branch resistor, the third branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the third branch is used for connecting the second end of the first branch or the second end of the second branch, the second branch resistor is arranged on the second branch, and the third branch resistor is arranged on the third branch. When the second end of the third branch is not connected with the second end of the first branch and the second end of the second branch, the single-pole double-throw switch is in an off state.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the third branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPb +R i SPc (the sum of the second branch resistance and the third branch resistance); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the third branch is connected with the second end of the first branch), wherein the number of elements in the set is N-M, and the elements are R j SPc (third branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 8
As shown in fig. 9, the branch resistors include a first branch resistor and a third branch resistor, the third branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the third branch is used for connecting the second end of the first branch or the second end of the second branch, the first branch resistor is arranged on the first branch, and the third branch resistor is arranged on the third branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the third branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPc (third branch resistance); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the third branch is connected with the second end of the first branch), wherein the number of elements in the set is N-M, and the elements are R j SPa +R j SPc (the sum of the first branch resistance and the third branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
example 9
As shown in fig. 10, the branch resistors include a first branch resistor, a second branch resistor and a third branch resistor, wherein the third branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the third branch is used for connecting the second end of the first branch or the second end of the second branch, the first branch resistor is arranged on the first branch, the second branch resistor is arranged on the second branch, and the third branch resistor is arranged on the third branch.
The fixed value digital potentiometer is provided with N single-pole double-throw switches with proper number, when P is the left connection of the single-pole double-throw switch (the second end of the third branch is connected with the second end of the second branch), the resistor is assembled, the number of elements in the assembly is M, and the elements are R i SPb +R i SPc (the sum of the second branch resistance and the third branch resistance); q is the complement of P, and forms a resistor set when the single-pole double-throw switch is connected right (the second end of the third branch is connected with the second end of the first branch), wherein the number of elements in the set is N-M, and the elements are R j SPa +R j SPc (the sum of the first branch resistance and the third branch resistance).
Let I be the set I formed by all I and J be the set J.
At this time, the output connections Vc and Vb have two output determined resistance values due to the uncertainty of the number of the left connection and the right connection, and the basic formula calculated by the series-parallel circuit can be obtained:
according to the constant value digital potentiometer, the three-end original of the original digital potentiometer is changed into the two-end original, and accurate numerical values are more conveniently output.
Compared with the traditional mechanical potentiometer, the invention improves the inaccuracy of the adjustment resistance of the screwdriver, greatly improves the adjustment efficiency of the potentiometer, has more accurate adjustment precision, can calculate the output by using a specific formula, and improves the efficiency at the same time. The adjustment can be performed by only changing the position of the single pole double throw switch. The operability of an operator is greatly facilitated.
Compared with a digital potentiometer, the invention solves the problem of large rated blocking error of the digital potentiometer, and the inaccuracy of the potentiometer is reduced by adjusting the position of the switch to accurately output. The problem that the allowable current of the sliding end is small is also solved. The magnitude of the current can be adjusted by adjusting the resistance value, the inherent defect limitation of the sliding rheostat is avoided, the operability and accuracy of the digital potentiometer are greatly improved, and the operation efficiency is also improved.
The invention is different from a potentiometer controlled by a shifting switch in that:
the structures are different. Compared with a potentiometer designed by a shifting switch, the single-pole double-throw switch has fewer switches, and one switch can control multiple paths (two paths or three paths) and has only a single loop. The potentiometer controlled by the shifting switch is provided with an independent switch on each path, and belongs to various loops.
The application is different. The 'potentiometer controlled by the shifting switch' is suitable for the potentiometer improvement on a small circuit board because of the characteristics of the switch, and the single-pole double-throw switch is suitable for the potentiometer with a large current resistor because of the characteristics of the switch.
The calculation formulas are different. Only a single loop requires few variables and only one control variable. The number of required parameters is smaller than that of a potentiometer controlled by a shifting switch, and the formula is simpler.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A constant value digital potentiometer, comprising: the high-voltage double-throw switch comprises a high end, a low end, an adjusting end, a first resistor, a second resistor and N single-pole double-throw switches which are connected in parallel, wherein the first resistor is connected between the high end and the adjusting end, the second resistor is connected between the adjusting end and the low end, each single-pole double-throw switch comprises a first branch, a second branch and a third branch, the first end of the first branch is connected with the high end, the first end of the second branch is connected with the adjusting end, the first end of the third branch is connected with the low end, branch resistors are respectively arranged in at least two branches of the first branch, the second end of the second branch and the second end of the third branch, and the third branch serve as three movable connecting ends of the single-pole double-throw switch; different switch connections are carried out through N single-pole double-throw switches, and different resistances are output between the high end and the low end;
the branch resistors comprise a first branch resistor and a second branch resistor, the first branch in each single-pole double-throw switch is a knife in the single-pole double-throw switch, the second end of the first branch is used for being connected with the second end of the second branch or the second end of the third branch, the first branch resistor is arranged on the first branch, and the second branch resistor is arranged on the second branch;
the high-side and low-side resistors R T Expressed as:
wherein R is u Represents a first resistance, R d Represents a second resistance, R i SPa +R i SPb Representing the i-th element in the set of resistances when the second end of the first branch is connected to the second end of the second branch, R j SPa The J-th element in the set of resistors is represented when the second end of the first branch is connected with the second end of the third branch, I is the set of I, and J is the set of J.
2. The constant value digital potentiometer according to claim 1, further comprising a third branch resistor disposed on the third branch.
3. The fixed value digital potentiometer according to claim 1, wherein the branch resistances comprise a first branch resistance and a third branch resistance, wherein the first branch in each single pole double throw switch is a knife in a single pole double throw switch, the second end of the first branch is used for connecting the second end of the second branch or connecting the second end of the third branch, the first branch resistance is arranged on the first branch, and the third branch resistance is arranged on the third branch.
4. The fixed value digital potentiometer according to claim 1, wherein the shunt resistor comprises a first shunt resistor and a second shunt resistor, wherein the second shunt is a pole in a single pole double throw switch in each single pole double throw switch, the second end of the second shunt is used for connecting the second end of the first shunt or the second end of the third shunt, the first shunt resistor is arranged on the first shunt, and the second shunt resistor is arranged on the second shunt.
5. The fixed value digital potentiometer according to claim 1, wherein the branch resistances comprise a second branch resistance and a third branch resistance, wherein the second branch in each single pole double throw switch is a knife in a single pole double throw switch, a second end of the second branch is used for connecting a second end of the first branch or a second end of the third branch, the second branch resistance is arranged on the second branch, and the third branch resistance is arranged on the third branch.
6. The constant value digital potentiometer according to claim 5, further comprising a first shunt resistor disposed on the first shunt resistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022105442116 | 2022-05-18 | ||
| CN202210544211 | 2022-05-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114974769A CN114974769A (en) | 2022-08-30 |
| CN114974769B true CN114974769B (en) | 2023-09-19 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4803458A (en) * | 1987-08-28 | 1989-02-07 | Wilbrecht Electronics, Inc. | Control switch and potentiometer for hearing aids and the like |
| CN101853722A (en) * | 2009-03-30 | 2010-10-06 | 武汉市创佳源电子有限公司 | Two resistance output modes of universal electronic potentiometer module |
| CN203491031U (en) * | 2013-09-30 | 2014-03-19 | 浙江欣亚磁电发展有限公司 | Electric potentiometer |
| CN203658894U (en) * | 2014-01-14 | 2014-06-18 | 皖西学院 | Two-way relay type digital potentiometer |
| CN107124789A (en) * | 2017-05-11 | 2017-09-01 | 郑州珂玛影视光电有限公司 | The Jing Yin drive circuits of the LED of illumination and adjustable color of Width funtion multichannel input |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
| CN210006552U (en) * | 2019-07-12 | 2020-01-31 | 成都恩菲特科技有限公司 | Program-controlled three-terminal adjustable resistor and system |
| CN214705598U (en) * | 2021-05-19 | 2021-11-12 | 陈锦 | Variable resistor simulating sliding rheostat |
-
2022
- 2022-06-02 CN CN202210625948.0A patent/CN114974769B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4803458A (en) * | 1987-08-28 | 1989-02-07 | Wilbrecht Electronics, Inc. | Control switch and potentiometer for hearing aids and the like |
| CN101853722A (en) * | 2009-03-30 | 2010-10-06 | 武汉市创佳源电子有限公司 | Two resistance output modes of universal electronic potentiometer module |
| CN203491031U (en) * | 2013-09-30 | 2014-03-19 | 浙江欣亚磁电发展有限公司 | Electric potentiometer |
| CN203658894U (en) * | 2014-01-14 | 2014-06-18 | 皖西学院 | Two-way relay type digital potentiometer |
| CN107124789A (en) * | 2017-05-11 | 2017-09-01 | 郑州珂玛影视光电有限公司 | The Jing Yin drive circuits of the LED of illumination and adjustable color of Width funtion multichannel input |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
| CN210006552U (en) * | 2019-07-12 | 2020-01-31 | 成都恩菲特科技有限公司 | Program-controlled three-terminal adjustable resistor and system |
| CN214705598U (en) * | 2021-05-19 | 2021-11-12 | 陈锦 | Variable resistor simulating sliding rheostat |
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| CN114974769A (en) | 2022-08-30 |
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