High-precision small resistor resistance measurement circuit

A resistance measurement, small resistance technology, applied in the field of circuits, can solve the problems of low reliability, low measurement accuracy, low degree of measurement automation, and achieve the effect of improving measurement accuracy and eliminating measurement errors

Active Publication Date: 2017-02-08
BEIJING INST OF ELECTRONICS SYST ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-wire resistance measurement method introduces the cable resistance and contact resistance of the measurement cable, which has the disadvantages of low measurement accuracy, low reliability and low degree of automation

Method used

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  • High-precision small resistor resistance measurement circuit
  • High-precision small resistor resistance measurement circuit
  • High-precision small resistor resistance measurement circuit

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Embodiment Construction

[0033] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0034] like figure 1 As shown, the high-precision small resistance measurement circuit provided in this embodiment includes: a constant current source circuit, a single-ended / differential operational amplifier circuit, an A / D conversion processing circuit and a microprocessor control circuit;

[0035] The constant current source circuit provides a high-precision constant tiny current for the measured resistance, and generates a millivolt-level measurement voltage on the measured resistance, which is used as the input analo...

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Abstract

The invention discloses a high-precision small resistor resistance measurement circuit. The circuit comprises a constant current source circuit, a single-terminal/difference operation amplification circuit, an A/D conversion processing circuit and a microprocessor control circuit. The constant current source circuit provides a constant micro current for a measured resistor and generates a millivolt-level measured voltage on the measured resistor. The single-terminal/difference operation amplification circuit amplifies the millivolt-level voltage to acquire the measured voltage after operation amplification. The A/D conversion processing circuit converts the measured voltage after operation amplification into a digital waveform so as to acquire the measured voltage of the digital waveform. The microprocessor control circuit carries out filtering processing on the measured voltage of the digital waveform, calculates and acquires a resistance of the measured resistor. In the technical scheme, measurement precision of the small resistor is increased.

Description

technical field [0001] The present invention relates to circuits. More specifically, it relates to a high-precision small resistance resistance measurement circuit. Background technique [0002] In many fields, the measurement of small resistance resistance measurement requires high-precision measurement results and high-safety measurement processes, such as the resistance measurement of pyrotechnics. Measuring the resistance value of pyrotechnics is an important step in missile comprehensive testing, and the measurement result is an important parameter related to whether the missile can be launched and flew normally. Generally, the resistance value of pyrotechnic products is relatively small, and the test accuracy is high, and the resistance measurement of pyrotechnic products must be carried out under safe conditions, and the measurement current is generally required to be no more than 10mA. The small change in the resistance value of a small resistor has a signal fluctu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/14
Inventor 雷锋成程鹏邵云峰陈玉峰
Owner BEIJING INST OF ELECTRONICS SYST ENG
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