CN216495289U - Blood sugar detection circuit and blood sugar measuring apparatu - Google Patents
Blood sugar detection circuit and blood sugar measuring apparatu Download PDFInfo
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- CN216495289U CN216495289U CN202220735871.8U CN202220735871U CN216495289U CN 216495289 U CN216495289 U CN 216495289U CN 202220735871 U CN202220735871 U CN 202220735871U CN 216495289 U CN216495289 U CN 216495289U
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Abstract
The utility model belongs to the technical field of blood sugar detection equipment, and discloses a blood sugar detection circuit and a blood sugar measuring instrument, which comprise an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a direct digital frequency synthesizer and a filtering amplification circuit; the first controller, the direct digital frequency synthesizer, the filtering and amplifying circuit and the electrode are sequentially connected, the first logarithmic amplifier is connected with the first adder, and the first adder is connected with the first controller; the first logarithmic amplifier is connected with the phase detector, the second logarithmic amplifier is connected with the electrode, the second logarithmic amplifier is connected with the phase detector, the second logarithmic amplifier is connected with the first adder, the phase detector is connected with the second adder, and the second adder is connected with the first controller. Has the advantages that: the first logarithmic amplifier and the second logarithmic amplifier amplify the exciting signal and the feedback signal respectively, so that a more accurate blood sugar measurement value can be obtained.
Description
Technical Field
The utility model relates to the technical field of blood sugar detection equipment, in particular to a blood sugar detection circuit and a blood sugar measuring instrument.
Background
At present, no effective method for radically treating diabetes exists, blood sugar is detected in time, and the method has very important significance for controlling diabetes and preventing complications. At present, blood sugar detection equipment can be divided into two types of invasive and non-invasive detection equipment, and invasive detection has high cost and is easy to cause pain of patients so as to be gradually replaced by non-invasive detection. In the blood sugar noninvasive detection equipment, the electrochemical detection method is easily influenced by external factors.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: provided are a blood glucose detection circuit and a blood glucose meter with higher accuracy.
In order to achieve the above object, the present invention provides a blood glucose detecting circuit, which includes an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a direct digital frequency synthesizer, and a filtering and amplifying circuit;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the second port of the first controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the third port of the first controller.
The utility model discloses a blood sugar detection circuit, which comprises an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a second controller, a direct digital frequency synthesizer and a filtering amplification circuit, wherein the electrode is connected with the first logarithmic amplifier;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the first port of the second controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the second port of the second controller.
Further, the first logarithmic amplifier and the second logarithmic amplifier have the same structure.
Further, the second port and the third port of the filtering and amplifying circuit are the same port.
Further, the second port and the third port of the first logarithmic amplifier are the same port.
Further, the second port and the third port of the second logarithmic amplifier are the same port.
The utility model also discloses a blood glucose measuring instrument which applies the blood glucose detection circuit.
Compared with the prior art, the blood sugar detection circuit and the blood sugar measuring instrument have the advantages that: the first logarithmic amplifier and the second logarithmic amplifier amplify the exciting signal and the feedback signal respectively, so that a more accurate blood sugar measurement value can be obtained.
Drawings
FIG. 1 is a schematic diagram of a first overall structure of a blood glucose detecting circuit according to the present invention;
FIG. 2 is a schematic diagram of a second overall structure of a blood glucose detecting circuit according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
Example 1:
as shown in fig. 1, the present invention discloses a blood glucose detecting circuit, which comprises an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a direct digital frequency synthesizer and a filtering and amplifying circuit;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the second port of the first controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the third port of the first controller.
In this embodiment, the first logarithmic amplifier and the second logarithmic amplifier have the same structure.
In this embodiment, the second port and the third port of the filtering and amplifying circuit may be the same port.
In this embodiment, the second port and the third port of the first logarithmic amplifier may be the same port.
In this embodiment, the second port and the third port of the second logarithmic amplifier may be the same port.
In this embodiment, the control signal of the first controller is sent to a direct digital frequency synthesizer, the direct digital frequency synthesizer generates a sinusoidal signal with response frequency and amplitude, and the sinusoidal signal enters a filtering and amplifying circuit to obtain a smooth sinusoidal excitation signal and is transmitted to the skin surface of the human body through the electrodes for measuring the impedance value of the human body.
In this embodiment, the driving signal source generates a driving signal to enter the human body through the skin, and the human body will generate a certain feedback signal. The excitation signal is connected with the first logarithmic amplifier, the feedback signal is connected with the second logarithmic amplifier, the first logarithmic amplifier is connected with the first adder and the phase detector, the second logarithmic amplifier is connected with the first adder and the phase detector, the first adder outputs an amplitude ratio signal, the phase detector is connected with the second adder, the second adder outputs a phase difference signal, and the phase difference signal and the amplitude ratio signal are sent to an MCU (first controller) to calculate an impedance value and calculate a blood glucose value.
The working principle is as follows: the first controller, the direct digital frequency synthesizer and the filter amplifying circuit form an excitation signal source circuit. The first controller unit generates a sine wave with response frequency and amplitude by sending a control signal to the direct digital frequency synthesizer, the sine wave enters the filtering and amplifying circuit, redundant clutter is filtered out, a smooth sine excitation signal which meets the medical standard is obtained, and the sine excitation signal is added to the surface of the skin of a human body through the electrode. The configuration of the filter amplifying circuit can be adjusted along with the excitation signals with different frequencies, so that the requirements of the excitation signals of low, medium and high frequency bands are matched, and the advantages that the low, medium and high frequency biological impedance can be measured are achieved.
The excitation signals with different frequencies are applied to the skin of a human body through the electrodes to measure the biological impedance, the biological impedance contains blood sugar information with correlation, and the blood sugar can be calculated through further extraction and processing. Feedback signals received from the electrodes are weak, and problems of power frequency interference, motion interference, environmental interference, electromyographic signal interference and the like exist in the acquisition process.
To accurately measure the impedance, the scheme also preferably adopts two groups of amplifiers with low power consumption, low noise, high bandwidth, ultralow bias current and excellent distortion performance, and adopts a completely symmetrical structure for eliminating the introduced measurement error. After the excitation signal and the feedback signal are processed by the logarithmic amplifier, the excitation signal and the feedback signal are respectively and simultaneously input into the first adder to obtain an amplitude ratio signal, input into the phase detector and the second adder to obtain a phase difference signal, and the amplitude ratio signal and the phase difference signal are sent to the first controller to carry out biological impedance calculation and draw an impedance spectrum.
Example 2:
as shown in fig. 2, the present invention discloses a blood glucose detecting circuit, which comprises an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a second controller, a direct digital frequency synthesizer and a filtering and amplifying circuit;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the first port of the second controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the second port of the second controller.
In this embodiment, the first logarithmic amplifier and the second logarithmic amplifier have the same structure.
In this embodiment, the second port and the third port of the filtering and amplifying circuit may be the same port.
In this embodiment, the second port and the third port of the first logarithmic amplifier may be the same port.
In this embodiment, the second port and the third port of the second logarithmic amplifier may be the same port.
In this embodiment, the control signal of the first controller is sent to a direct digital frequency synthesizer, the direct digital frequency synthesizer generates a sinusoidal signal with response frequency and amplitude, and the sinusoidal signal enters a filtering and amplifying circuit to obtain a smooth sinusoidal excitation signal and is transmitted to the skin surface of the human body through the electrodes for measuring the impedance value of the human body.
In this embodiment, the driving signal source generates a driving signal to enter the human body through the skin, and the human body will generate a certain feedback signal. The excitation signal is connected with the first logarithmic amplifier, the feedback signal is connected with the second logarithmic amplifier, the first logarithmic amplifier is connected with the first adder and the phase detector, the second logarithmic amplifier is connected with the first adder and the phase detector, the first adder outputs an amplitude ratio signal, the phase detector is connected with the second adder, the second adder outputs a phase difference signal, and the phase difference signal and the amplitude ratio signal are sent to an MCU (second controller) to calculate an impedance value and calculate a blood glucose value.
The working principle is as follows:
the first controller triggers the signal excitation electricity at regular time to generate ordered excitation signals to be loaded on the skin through the electrodes, and meanwhile, the second controller carries out continuous sampling on the processed feedback signals to draw impedance spectrums in different time periods. The second controller analyzes the difference between the impedance spectrums in different time periods according to the correlation between the personal biological impedance and the blood sugar, and then calculates the blood sugar trend in each time period.
Example 3:
the utility model also discloses a blood glucose measuring instrument, which applies the blood glucose detection circuit described in embodiment 1 or embodiment 2.
To sum up, the embodiment of the present invention provides a blood glucose detecting circuit and a blood glucose measuring apparatus, which have the following beneficial effects: the first logarithmic amplifier and the second logarithmic amplifier amplify the exciting signal and the feedback signal respectively, so that a more accurate blood sugar measurement value can be obtained.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A blood sugar detection circuit is characterized by comprising an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a direct digital frequency synthesizer and a filtering amplification circuit;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the second port of the first controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the third port of the first controller.
2. A blood sugar detection circuit is characterized by comprising an electrode, a first logarithmic amplifier, a second logarithmic amplifier, a phase detector, a first adder, a second adder, a first controller, a second controller, a direct digital frequency synthesizer and a filtering and amplifying circuit;
the first port of the first controller is connected with the first port of the direct digital frequency synthesizer, the second end of the direct digital frequency synthesizer is connected with the first end of the filtering and amplifying circuit, and the second port of the filtering and amplifying circuit is connected with the electrode; the third port of the filter amplifying circuit is connected with the first port of the first logarithmic amplifier;
the second port of the first logarithmic amplifier is connected with the first port of the first adder, and the second port of the first adder is connected with the first port of the second controller; the third port of the first logarithmic amplifier is connected with the first port of the phase detector, the first port of the second logarithmic amplifier is connected with the electrode, the second port of the second logarithmic amplifier is connected with the second port of the phase detector, the third port of the second logarithmic amplifier is connected with the third port of the first adder, the third port of the phase detector is connected with the first port of the second adder, and the second port of the second adder is connected with the second port of the second controller.
3. The blood glucose detecting circuit of claim 1 or 2, wherein the first logarithmic amplifier and the second logarithmic amplifier are identical in structure.
4. The blood glucose detecting circuit of claim 1 or 2, wherein the second port and the third port of the filter amplifying circuit are the same port.
5. The blood glucose detecting circuit of claim 1 or 2, wherein the second port and the third port of the first logarithmic amplifier are the same port.
6. The blood glucose detecting circuit of claim 1 or 2, wherein the second port and the third port of the second logarithmic amplifier are the same port.
7. A blood glucose meter, characterized in that it employs the blood glucose detecting circuit of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220735871.8U CN216495289U (en) | 2022-04-01 | 2022-04-01 | Blood sugar detection circuit and blood sugar measuring apparatu |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220735871.8U CN216495289U (en) | 2022-04-01 | 2022-04-01 | Blood sugar detection circuit and blood sugar measuring apparatu |
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| Publication Number | Publication Date |
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| CN216495289U true CN216495289U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220735871.8U Active CN216495289U (en) | 2022-04-01 | 2022-04-01 | Blood sugar detection circuit and blood sugar measuring apparatu |
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- 2022-04-01 CN CN202220735871.8U patent/CN216495289U/en active Active
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