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Alternating current impedance measuring circuit with correction function

A technology for measuring AC impedance and measuring circuits, which is applied in diagnostic recording/measurement, medical science, sensors, etc. It can solve problems that affect the accuracy of measurement results and inconvenient practical applications, and achieve accurate correction results

Pending Publication Date: 2021-12-17
HYCON TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art mentioned above, when the AC impedance measurement circuit is calibrated, two external calibration impedances are required, which is inconvenient in practical application
In addition, the switch in series with the DUT also has impedance, which will affect the accuracy of the measurement results

Method used

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  • Alternating current impedance measuring circuit with correction function
  • Alternating current impedance measuring circuit with correction function
  • Alternating current impedance measuring circuit with correction function

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Embodiment Construction

[0030] The present invention will be more specifically described with reference to the following examples. Please note that the following descriptions of the embodiments of the present invention are for illustrative purposes only; they are not meant to be exhaustive or limited to the disclosed form.

[0031] For a first embodiment of the invention see figure 1 , which shows an AC impedance measurement circuit, including a waveform generating circuit 10, including a sine wave signal output terminal for outputting a sine wave signal, and a frequency signal output terminal for outputting a frequency signal; a first amplifier 20 , the positive input end of the first amplifier 20 is connected to the output end of the sine wave signal; a switch circuit 30 is connected with the negative input end of the first amplifier 20 and the output end of the first amplifier 20; an impedance to be measured 401 and a correction impedance 402, connected to the switch circuit 30; a second amplifie...

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Abstract

The invention discloses an alternating current impedance measuring circuit with a correction function. The alternating current impedance measuring circuit is characterized in that only one correction impedance is needed, a switching circuit is matched, and the equivalent impedance of the switching circuit, the gain of the circuit and the phase offset can be calculated according to the measuring results of two correction modes. According to the results, the equivalent impedance value of the switching circuit is deducted from the measuring results of the measuring modes, and the alternating current conductance value and the alternating current conductance phase value of the impedance to be measured can be accurately calculated. In addition, the phase difference of an input sine wave signal and a sampling frequency signal is adjusted, the impedance value of the same phase and the impedance value of the quadrature phase can be obtained, and the alternating current impedance value and the phase angle of the impedance to be measured are calculated.

Description

technical field [0001] The present invention relates to an AC impedance measurement circuit, and in particular to a measurement circuit with a correction function, which calculates the equivalent impedance of a switch circuit, compensates the measurement result, and improves measurement precision. Background technique [0002] The AC impedance measurement circuit is widely used in the measurement of human body impedance, allowing users to pay attention to their own body fat content, and then more accurately grasp their own health status. Compared with the DC impedance measurement circuit, although the DC impedance measurement circuit is simpler, the disadvantage is that the measurement result includes the human skin impedance, which makes the accuracy of the total human body impedance measurement result worse. The AC impedance measurement circuit can reduce the influence of skin impedance on the measurement results, and accurately analyze the equivalent AC impedance and phas...

Claims

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Application Information

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IPC IPC(8): A61B5/0531A61B5/0537
CPCA61B5/0537
Inventor 赵伯寅李永竹庄郁暐
Owner HYCON TECH
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