Contact resistance measuring system and method based on voltage-frequency conversion method

A technology of contact resistance and frequency conversion, applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of poor data stability and low accuracy, and achieve high accuracy and strong data stability Effect

Inactive Publication Date: 2012-10-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology measures how well it works with stable measurements over time without any changes or errors that could affect its results.

Problems solved by technology

This patents describes different methods for determining how well an electrical connection between two devices needs to work properly in terms of reducing impedance without increasing its size or requiring more power than what was previously possible with other techniques like direct electricity measurements.

Method used

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  • Contact resistance measuring system and method based on voltage-frequency conversion method
  • Contact resistance measuring system and method based on voltage-frequency conversion method
  • Contact resistance measuring system and method based on voltage-frequency conversion method

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specific Embodiment approach 1

[0027] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, the contact resistance measurement system based on the voltage-frequency conversion method, which includes a controllable constant current source 1, a standard current-sensing resistor 3, a variable-gain voltage amplifier 4, a voltage-frequency converter 5, and a voltage follower 6. AD converter 7 and single chip microcomputer 8;

[0028] The power output terminal of the controllable current source 1 is connected to one end of the component under test 2; the other end of the component under test 2 is connected to one end of the standard current-sensing resistor 3; the other end of the standard current-sensing resistor 3 is connected to the power ground ;

[0029] The variable gain voltage amplifier 4 collects the terminal voltage at both ends of the component under test 2; the voltage signal output terminal of the variable gain voltage amplifier 4 is connected with the voltage signa...

specific Embodiment approach 2

[0040] Embodiment 2. The contact resistance measurement system based on the voltage-frequency conversion method described in this embodiment and Embodiment 1 is characterized in that it also includes a liquid crystal display module 9, and the display signal input of the liquid crystal display module 9 The end is connected with the display signal output end of the single-chip microcomputer 8.

specific Embodiment approach 3

[0041] Specific embodiment three, this specific embodiment and the contact resistance measurement system based on the voltage-frequency conversion method described in specific embodiment one are characterized in that it also includes a keyboard 10, and the keyboard signal output terminal of the keyboard 10 is connected to the single-chip microcomputer 9 connected to the keyboard signal input terminal.

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Abstract

The invention discloses a contact resistance measuring system and method based on a voltage-frequency conversion method and relates to a contact resistance measuring system and method which are used for solving the problem that a contact resistance measuring method is poor in data stability and low in accuracy. According to the invention, a variable gain voltage amplifier is adopted for acquiring and amplifying the voltages U of the two ends of a to-be-measured component; a voltage follower is adopted for acquiring a voltage between the to-be-measured component and a standard current-detecting resistor, and after being isolated, the voltage is input to an AD (analog to digital) converter, and then the voltage is converted into a digital quantity ix through the AD converter; a voltage-frequency converter is adopted for converting the amplified voltages into frequency signals, and carrying out timing counting on the frequency signals so as to obtain the digital quantities Ux of the voltages U of the two ends of the to-be-measured component; a digital quantity Ix of an exciting current is calculated acceding to the digital quantities Ux; and then the resistance value of the to-be-measured component is obtained, thereby realizing the contact resistance measurement based on the voltage-frequency conversion method. The system and method disclosed by the invention are applicable to the measurement of contact resistances.

Description

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Claims

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Application Information

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Owner HARBIN INST OF TECH
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