Variable resistor three-lead anti-interference structure

Abstract

The utility model is suitable for the technical field of piezoelectric ceramic wafers, and provides a variable resistor body, the variable resistor body is connected with a first lead-out wire, a second lead-out wire and a third lead-out wire, and the first lead-out wire and the second lead-out wire are connected to two ends of the variable resistor body to form a flowing current area. The third leading-out wire is connected to the middle position or another specific point of the variable resistor body to form a non-flowing current area, a first capacitor is connected between the end point of the first leading-out wire and the ground and used for absorbing interference signals sensed by the non-flowing current area, and a second capacitor is connected between the end point of the second leading-out wire and the end point of the third leading-out wire and used for absorbing interference signals sensed by the non-flowing current area. The first lead-out wire is used for forming an alternating-current loop and reducing interference signals superposed at the end point of the first lead-out wire; through the arrangement of the first leading-out wire, the second leading-out wire and the third leading-out wire and the arrangement of the first capacitor and the second capacitor, the accuracy of resistance change signals is integrally improved, the signal processing speed is increased, and the influence of interference signals is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-interference circuits, and in particular relates to a variable resistor three-lead anti-interference structure. Background Art

[0002] In position detection systems, variable resistors (often called potentiometers or rheostats) are often used to detect the position of mechanical components. These systems are widely used in various industrial and automotive applications, such as brake position, seat position, and accelerator position. Traditional position detection systems may use simple analog circuits to process the voltage change across resistors AB due to the resistance change. These circuits are often slow and cannot meet the requirements of fast response. When voltage change processing is slow, the impact of interference is more significant.

[0003] Therefore, the prior art has defects. Utility Model Content

[0004] The purpose of the utility model is to overcome the disadvantage of slow voltage change processing speed in the above-mentioned prior art, and to provide a variable resistor three-lead anti-interference structure.

[0005] The utility model is implemented as follows: a variable resistor three-lead anti-interference structure includes a variable resistor body, the variable resistor body is connected to a first lead wire, a second lead wire and a third lead wire, the first lead wire and the second lead wire are connected to the two ends of the variable resistor body to form a current flow area, the third lead wire is connected to the middle position or another specific point of the variable resistor body to form a current non-flow area, a first capacitor is connected between the end point of the first lead wire and the ground, for absorbing the interference signal sensed in the current non-flow area, a second capacitor is connected between the end point of the second lead wire and the end point of the third lead wire, for forming an AC loop to reduce the interference signal superimposed on the end point of the first lead wire.

[0006] Furthermore, it also includes a signal processing unit for real-time monitoring and processing of voltage changes between the first lead wire and the second lead wire caused by resistance changes.

[0007] Furthermore, the signal processing unit includes at least one amplifier and / or filter for enhancing the detected resistance change signal and suppressing interference signals.

[0008] Furthermore, the first lead wire, the second lead wire and the third lead wire are all shielded wires to reduce the impact of external electromagnetic interference on the circuit.

[0009] The utility model provides a variable resistor three-lead anti-interference structure, in which the endpoints of the first lead and the second lead are directly connected to the two ends of the variable resistor body for measuring the resistance value. When the resistance value of the variable resistor body changes, the endpoint voltage of the first lead and the endpoint voltage of the second lead will also change accordingly. The third lead is connected to the middle of the resistor body or other specific position. Its function is to provide a path so that the interference signal sensed in the area where no current flows can pass through the endpoint of the third lead, through the second capacitor to the endpoint of the second lead, forming an AC loop. The interference signal that may have been superimposed on the endpoint of the first lead is shunted, thereby reducing the impact on the endpoint of the first lead, so that the voltage change caused by the electronic change between the endpoint of the first lead and the endpoint of the second lead can be quickly processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0012] Figure 1 It is a structural diagram provided by the utility model.

[0013] Figure 2 This is a circuit diagram provided by the utility model.

[0014] Explanation of the accompanying drawings: 1. variable resistor; 2. first lead wire; 3. second lead wire; 4. third lead wire; 5. first capacitor; 6. second capacitor; 7. signal processing unit. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] See also Figure 1-Figure 2The utility model discloses a variable resistor three-lead anti-interference structure, comprising a variable resistor 1, which can be a potentiometer, a varistor, or another type of variable resistor. The variable resistor 1 is connected to a first lead 2, a second lead 3, and a third lead 4. Preferably, the first lead 2, the second lead 3, and the third lead 4 are all shielded wires to reduce the impact of external electromagnetic interference on the circuit.

[0017] The first lead wire 2 and the second lead wire 3 are connected to the two ends of the variable resistor 1 to form a current flow area, which is responsible for the flow of current and the transmission of power to detect resistance changes. The third lead wire 4 is connected to the middle position or another specific point of the variable resistor 1 to form a current non-flow area, which is used for the absorption of interference signals and the measurement of voltage division, thereby providing more accurate resistance value measurement. By measuring the voltage between the third lead wire 4 and the first lead wire 2 or the voltage between the third lead wire 4 and the second lead wire 3, the actual resistance value of the variable resistor 1 can be calculated more accurately. The third lead wire 4 provides an additional detection point, which enables the resistance value of the variable resistor 1 to be detected from different positions, which helps to improve the accuracy and reliability of the measurement.

[0018] A first capacitor 5 is connected between the endpoint of the first lead wire 2 and the ground to absorb interference signals induced in the area where no current flows. Since the area where no current flows may induce external electromagnetic interference, these interferences will not directly affect the flow of current, but may generate noise in the circuit. The first capacitor 5 can effectively absorb these interference signals and reduce the impact on the circuit. A second capacitor 6 is connected between the endpoint of the second lead wire 3 and the endpoint of the third lead wire 4 to form an AC loop to reduce the interference signal superimposed on the endpoint of the first lead wire 2. Because the interference signal in the circuit often forms a loop between different lead endpoints, and this additional loop helps to shunt and offset these interferences. Specifically, the interference signal sensed in the area where no current flows can pass through the endpoint of the third lead wire 4, through the second capacitor 6 to the endpoint of the second lead wire 3, to form an AC loop. The interference signal that may have been superimposed on the endpoint of the first lead wire 2 is shunted, thereby weakening the impact on the endpoint of the first lead wire 2, so that the voltage change caused by electronic changes between the endpoint of the first lead wire 2 and the endpoint of the second lead wire 3 can be quickly processed. The faster the processing speed of the voltage change, the greater the impact of interference.

[0019] Furthermore, a signal processing unit 7 is included for real-time monitoring and processing of voltage changes caused by resistance changes between the first lead 2 and the second lead 3. The signal processing unit 7 includes at least one amplifier and / or filter for enhancing the detected resistance change signal and suppressing interference signals, further accelerating signal processing speed, and thus directly improving the processing speed of voltage changes.

[0020] By setting the first lead wire 2, the second lead wire 3 and the third lead wire 4 and setting the first capacitor 5 and the second capacitor 6, the accuracy of the resistance change signal is improved as a whole, the signal processing speed is accelerated, and the influence of interference signals is reduced. This three-lead structure provides greater flexibility and adaptability and can be applied to a variety of different electronic devices and environments.

[0021] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A variable resistor three-lead anti-interference structure, characterized by: The invention comprises a variable resistor (1), wherein the variable resistor (1) is connected to a first lead wire (2), a second lead wire (3) and a third lead wire (4), wherein the first lead wire (2) and the second lead wire (3) are connected to both ends of the variable resistor (1) to form a current flow area, and the third lead wire (4) is connected to the middle position or another specific point of the variable resistor (1) to form a current non-flow area, wherein a first capacitor (5) is connected between the end point of the first lead wire (2) and the ground to absorb interference signals induced in the current non-flow area, and a second capacitor (6) is connected between the end point of the second lead wire (3) and the end point of the third lead wire (4) to form an AC loop to reduce interference signals superimposed on the end point of the first lead wire (2).

2. The variable resistor three-lead anti-interference structure according to claim 1, characterized in that: It also includes a signal processing unit (7) for real-time monitoring and processing of voltage changes between the first lead wire (2) and the second lead wire (3) caused by resistance changes.

3. The variable resistor three-lead anti-interference structure according to claim 2, characterized in that: The signal processing unit (7) comprises at least one amplifier and / or filter, which is used to enhance the detected resistance change signal and suppress interference signals.

4. The variable resistor three-lead anti-interference structure according to claim 1, characterized in that: The first lead wire (2), the second lead wire (3) and the third lead wire (4) are all shielded wires to reduce the influence of external electromagnetic interference on the circuit.

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