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Real-time fault distinguishing circuit and distinguishing method for potentiometer type angle sensor

A technology of rotation angle sensor and real-time fault, which is applied in the direction of measuring resistance/reactance/impedance, instruments, and electrical devices, etc. It can solve the problems of potentiometer brush material aging, wear cost, sensitivity, etc., and achieve high reliability and simple circuit , to achieve easy results

Pending Publication Date: 2022-04-01
石家庄数英仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] One of the purposes of the present invention is to provide a potentiometer-type angle sensor real-time fault discrimination circuit to solve the problems of aging, wear and cost sensitivity of potentiometer brush materials in the prior art

Method used

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  • Real-time fault distinguishing circuit and distinguishing method for potentiometer type angle sensor
  • Real-time fault distinguishing circuit and distinguishing method for potentiometer type angle sensor
  • Real-time fault distinguishing circuit and distinguishing method for potentiometer type angle sensor

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Embodiment 1

[0044] Such as Figure 5 As shown, the present invention includes a potentiometer VR, a bias resistor Rtest, and a single-chip microcomputer U including an analog-to-digital converter ADC, an IO port with a push-pull output and a high-impedance input.

[0045] The upper end of the potentiometer VR is connected to the positive end X of the reference voltage Vref, the lower end is connected to the reference ground D, and the brush is connected to the positive end of the output voltage Vx; one end of the bias resistor Rtest is connected to the brush end of the potentiometer VR, and the other end is connected to node A ;

[0046] The power supply voltage VCC of the microcontroller U is connected to the positive terminal X of the reference voltage Vref, the input analog quantity Adin is connected to the brush of the potentiometer VR, and the IO port is connected to the node A. The single-chip microcomputer U controls the switch K1 and the switch K2, and the IO port is connected be...

Embodiment 2

[0058] The real-time fault discrimination method of the potentiometer type rotation angle sensor of the present invention comprises the following steps:

[0059] A, potentiometer type angle sensor real-time fault discrimination method is applied to the potentiometer type angle sensor real-time fault discrimination circuit in embodiment 1, and this circuit diagram is Figure 5 , Figure 4 yes Figure 5 The simplified circuit, Figure 6 yes Figure 4 the equivalent circuit.

[0060] B. Calculate the internal resistance Rs of the potentiometer.

[0061] The switch K1 and switch K2 are controlled by the single-chip microcomputer U, and the output voltage Vx is measured by the analog-to-digital converter ADC inside the single-chip microcomputer to obtain the first output voltage Vx1, and the internal resistance of the potentiometer Rs=Rup*Rdown / (Rup is calculated by the single-chip microcomputer U +Rdown). Since the contact resistance Rcont ranges from about 1Ω to tens of kΩ ...

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Abstract

The invention provides a potentiometer type corner sensor real-time fault discrimination circuit and discrimination method. The potentiometer type corner sensor real-time fault discrimination circuit comprises a potentiometer VR, a bias resistor Rtest and a single-chip microcomputer U, wherein the single-chip microcomputer U comprises an analog-to-digital converter ADC and an IO port end with push-pull output and high-resistance input functions; the upper end of the potentiometer VR is connected with the positive end X of the reference voltage Vref, and the lower end is connected with the reference ground D. The electric brush is connected with the positive end of the output voltage Vx. One end of the bias resistor Rtest is connected to the brush end of the potentiometer VR, and the other end of the bias resistor Rtest is connected to the node A; the power supply voltage VCC end of the single-chip microcomputer U is connected with the positive electrode end X of the reference voltage Vref, the input analog quantity Adin end is connected with the electric brush of the potentiometer VR, and the IO port end is connected with the node A. According to the method, the contact resistance of the potentiometer can be judged in each measurement period, whether the potentiometer breaks down or not is judged, sudden failure can be found immediately, fault processing is carried out, and serious consequences caused by using wrong measurement values are avoided. The operation and the judgment are both completed by single chip microcomputer software, the circuit is simple, the implementation is easy, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of measuring rotation angle circuits, in particular to a potentiometer type rotation angle sensor real-time fault discrimination circuit and a discrimination method. Background technique [0002] In many occasions that need to measure the rotation angle, such as the electronic rocker used in remote control, the angle control of the rocker arm of the steering gear, the closed-loop control of the valve opening, the liquid level measurement, etc., it is necessary to use the rotation angle sensor to convert the measured rotation angle into an electrical signal for measurement. [0003] There are many components for measuring the rotation angle, among which the potentiometer is the cheapest and simplest measurement component. [0004] A potentiometer is usually a resistive element with three terminals, and the output signal has a linear relationship with the rotation angle. It usually consists of a resistor body...

Claims

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Application Information

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IPC IPC(8): G01B7/30G01R27/02
Inventor 温航宇满津蒋富雄周云亮尹倩倩
Owner 石家庄数英仪器有限公司
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