CN115363556A - Contact impedance measuring circuit, method and device, chip and electronic equipment - Google Patents
Contact impedance measuring circuit, method and device, chip and electronic equipment Download PDFInfo
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Abstract
The application provides a contact impedance measuring circuit, a method, a device, a chip and an electronic device. The application provides a contact impedance measurement circuit includes: the excitation signal control port group is used for being connected with the first group of electrodes and outputting or receiving excitation signals through the first group of electrodes; wherein the first set of electrodes comprises any two electrodes of the plurality of electrodes; the voltage signal measurement port group is used for being connected with the first group of electrodes connected with the excitation signal control port group and acquiring voltage signals of the first group of electrodes; and the measuring module is used for acquiring the measured impedance of the at least one first group of electrodes according to the excitation signal and the voltage signal and obtaining the contact impedance of the at least one electrode according to the measured impedance. The application provides a contact impedance measurement circuit has improved the degree of accuracy that contact impedance measured, reduces the influence of contact impedance to bioimpedance measurement among the actual measurement to bioimpedance measurement's degree of accuracy has been improved.
Description
Technical Field
The present disclosure relates to the field of bioelectrical impedance technologies, and in particular, to a contact impedance measurement circuit, a method, an apparatus, a chip, and an electronic device.
Background
The organism impedance measurement is a nondestructive detection technology for extracting biomedical information related to human physiological and pathological conditions by utilizing the electrical characteristics and change rules of biological tissues and organs. In the measurement of the impedance of the organism, the contact impedance between the electrode and the organism has great influence on the accuracy and repeatability of the impedance measurement result of the object to be measured, so that the error of the impedance measurement of the object to be measured is large.
Content of application
The present application aims to provide a contact impedance measurement circuit, a method, a device, a chip and an electronic apparatus, so as to solve the technical problem in the prior art that the error of the bio-impedance measurement is large.
The technical scheme of this application as follows provides a contact impedance measurement circuit, includes:
the excitation signal control port set is used for being connected to the first set of electrodes and outputting or receiving excitation signals through the first set of electrodes; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes;
the voltage signal measurement port set is used for being connected with the first group of electrodes connected with the excitation signal control port set and acquiring voltage signals of the first group of electrodes;
and the measuring module is used for acquiring the measured impedance of at least one first group of electrodes according to the excitation signal and the voltage signal and obtaining the contact impedance of at least one first group of electrodes according to the measured impedance.
Another technical solution of the present application is as follows, providing a contact impedance measuring method, including:
outputting or receiving an excitation signal through a first group of electrodes connected with the excitation signal control port group; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes;
acquiring voltage signals of the first group of electrodes through a voltage signal measurement port group;
and obtaining the measured impedance of at least one electrode in the first group according to the excitation signal and the voltage signal, and obtaining the contact impedance of at least one electrode according to the measured impedance.
Another aspect of the present application provides a contact impedance measuring apparatus, including the contact impedance measuring circuit according to any one of the above aspects, and a plurality of electrodes connected to the contact impedance measuring circuit.
Another technical solution of the present application is as follows, providing a chip including the contact impedance measuring circuit described in any one of the above.
Another aspect of the present invention is to provide an electronic device, including the contact impedance measuring circuit according to any one of the above aspects, the contact impedance measuring apparatus according to any one of the above aspects, or the chip according to any one of the above aspects.
The beneficial effect of this application lies in: connecting the excitation signal control port set to a first set of electrodes, and outputting or receiving excitation signals through the first set of electrodes; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes; connecting a voltage signal measurement port set to the first group of electrodes connected to the excitation signal control port set, and acquiring voltage signals of the first group of electrodes; enabling a measurement module to obtain the measured impedance of at least one first group of electrodes according to the excitation signal and the voltage signal, and obtaining the contact impedance of at least one first group of electrodes according to the measured impedance; through the technical scheme, the measurement of the contact impedance of all the electrodes is realized, the influence of the contact impedance on the impedance measurement of the object to be measured in actual measurement is reduced, and therefore the accuracy of the impedance measurement of the object to be measured is improved.
Drawings
FIG. 1 is a first block diagram of a contact impedance measuring circuit according to an embodiment of the present disclosure;
FIG. 2 is a block diagram of a second embodiment of a contact impedance measuring circuit;
FIG. 3 is a block diagram of a third embodiment of a contact impedance measurement circuit;
FIG. 4 is a block diagram of a contact impedance measuring circuit according to an embodiment of the present disclosure;
FIG. 5 is a block diagram of a contact impedance measurement circuit according to an embodiment of the present disclosure;
FIG. 6 is a block diagram six of a contact impedance measurement circuit according to an embodiment of the present application;
FIG. 7 is a block diagram of a contact impedance measurement circuit according to an embodiment of the present disclosure;
fig. 8 is a block diagram eight of the structure of the contact impedance measuring circuit according to the embodiment of the present application;
FIG. 9 is a schematic diagram of a first measurement of contact impedance of an electrode provided by an embodiment of the present application;
FIG. 10 is a schematic diagram illustrating a second measurement of contact impedance of an electrode according to an embodiment of the present application;
fig. 11 is a first schematic structural diagram of a contact impedance measuring apparatus according to an embodiment of the present disclosure;
fig. 12 is a second schematic structural diagram of a contact impedance measuring apparatus according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a chip according to an embodiment of the present disclosure;
fig. 14 is a first schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the embodiments of the present application, at least one means one or more; plural means two or more. In the description of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.
It is to be noted that "connected" in the embodiments of the present application may be understood as an electrical connection, and the connection of two electrical components may be a direct or indirect connection between the two electrical components. For example, a and B may be connected directly or indirectly through one or more other electrical components.
The biological impedance measurement is a nondestructive detection technology for extracting biomedical information related to human physiological and pathological conditions by using the electrical characteristics and change rules of biological tissues and organs. It usually applies an excitation electrical signal to the object to be measured by means of electrodes disposed on electronic equipment such as a body fat scale or a body composition analyzer, and measures impedance data of the object to be measured according to the change of the excitation electrical signal after passing through a conductive loop of the object to be measured. Currently, a four-electrode or eight-electrode measurement method is commonly used in the bio-impedance measurement, but in the measurement method, contact impedance is generated due to contact between an electrode and an object to be measured, and the contact impedance greatly affects the impedance measurement result of the object to be measured, so that the accuracy of the impedance measurement result is seriously affected.
In order to alleviate the above problem, the present embodiment provides a contact impedance measuring circuit 100, please refer to fig. 1 to 3, the contact impedance measuring circuit 100 includes a set of excitation signal control ports 11, a set of voltage signal measuring ports 12, and a measuring module 13. The excitation signal control port set 11 is used for being connected to the first set of electrodes 201 and outputting or receiving excitation signals through the first set of electrodes 201; wherein the first set of electrodes 201 comprises any two electrodes of the plurality of electrodes 20. And the voltage signal measurement port set 12 is used for being connected to the first group of electrodes 201 connected with the excitation signal control port set 11 and is used for acquiring voltage signals of the first group of electrodes 201. And the measuring module 13 is used for acquiring the measured impedance of at least one first group of electrodes 201 according to the excitation signal and the voltage signal, and obtaining the contact impedance of at least one electrode according to the measured impedance.
In this embodiment, the excitation signal control port set and the voltage signal measurement port set are simultaneously connected to any two electrodes of the plurality of electrodes, that is, in order to obtain the contact impedance of the electrodes, the excitation signal control port set and the voltage signal measurement port set are simultaneously connected to the same set of electrodes (the first set of electrodes 201), the excitation signal control port set outputs or receives an excitation signal through the first set of electrodes 201, and the voltage signal measurement port set 12 connected to the first set of electrodes 201 measures the voltage of the first set of electrodes 201, so that all the electrodes of the plurality of electrodes 20 can be sequentially connected to the excitation signal control port set 11 and the voltage signal measurement port set 12 by combining any two electrodes, and then the measurement module 13 obtains the contact impedance of at least one electrode.
For better understanding of the present application, a conventional 4-electrode measurement method will be described by taking a 4-electrode measurement method and a human body as an example in the examples of the present application. Generally, when 4 electrodes are used to measure the impedance of a human body, 2 electrodes of the 4 electrodes are used as excitation electrodes, and the other 2 electrodes are used as measurement electrodes, wherein two excitation electrodes are respectively in contact with different parts of the human body, such as the left hand and the right hand, or the left foot and the right foot. The two measuring electrodes also correspond to the two excitation electrodes for measuring the voltage. The excitation signal flows through the human body from one excitation electrode and is output from the other excitation electrode, and due to the existence of human body impedance, the excitation signal has voltage drop between the two measuring electrodes, and after the excitation signal is collected by the measuring electrodes and further processed, the human body impedance data can be calculated. In the application, in order to obtain the contact impedance generated when at least one electrode is in contact with a human body, different from the prior art that an excitation electrode is only used for transmitting an excitation signal and a measurement electrode is only used for measuring a voltage signal, in the application, the functions and the connection relation of the excitation electrode and the measurement electrode are not limited, and the functions of the two types of electrodes can be mixed without special distinction. I.e. the excitation electrodes can be used both for transmitting excitation signals and for measuring voltages, and the measurement electrodes can be used both for measuring voltages and for transmitting excitation signals. That is, any two electrodes in the plurality of electrodes may be both excitation electrodes, one may be an excitation electrode, the other may be a measurement electrode, or both may be measurement electrodes, and may be combined as desired.
In this embodiment, at least one group of electrodes may be simultaneously connected to the excitation signal control port group 11 and the voltage signal measurement port group 12 in a manner that a plurality of electrodes are arbitrarily combined two by two, and then the measurement module obtains the measurement impedance of at least the first group of electrodes, so as to obtain the contact impedance of at least one electrode; the method and the device realize the measurement of the contact impedance of at least one electrode, improve the accuracy of the measurement of the contact impedance, reduce the influence of the contact impedance on the measurement of the biological impedance in the actual measurement and improve the accuracy of the measurement of the biological impedance.
In some embodiments, in order to measure the contact impedance of each electrode, it is necessary to control the connection state of each electrode with the contact impedance measuring circuit 100, referring to fig. 2, the contact impedance measuring circuit 100 further includes a switch module 14, and the switch module 14 is configured to control the connection state of each electrode with the excitation signal control port set 11 and the voltage signal measuring port set 12 respectively. The switch module 14 is connected to the excitation signal control port group 11 and the voltage signal measurement port group 12, respectively, and is further connected to the plurality of electrodes 20 for controlling the plurality of electrodes 20, so that the electrodes can be connected to the excitation signal control port group 11 and the voltage signal measurement port group 12 through the switch module 12, and the specific structure of the switch module 14 is not limited herein, and only needs to control the connection state of each electrode with the excitation signal control port group 11 and the voltage signal measurement port group 12, respectively.
In some embodiments, referring to fig. 4, the switch module 14 is configured to control the second set of electrodes 202 to be disconnected from the excitation signal control port set 11 and the voltage signal measurement port set 12 when the first set of electrodes 201 is connected to the excitation signal control port set 11 and the voltage signal measurement port set 12, respectively; wherein the second set of electrodes 202 includes electrodes of the plurality of electrodes 20 other than the first set of electrodes 201. When the first group of electrodes 201 are connected to the excitation signal control port group 11 and the voltage signal measurement port group 12, respectively, in order to avoid the remaining electrodes from being connected to the excitation signal control port group 11 and the voltage signal measurement port group 12, the second group of electrodes 202 may be controlled by the switch module 12, that is, the electrodes except the first group of electrodes 201 in the plurality of electrodes 20 are disconnected from the excitation signal control port group 11 and the voltage signal measurement port group 12, so that when the combination of any two electrodes in the plurality of electrodes 20 is connected to the excitation signal control port group 11 and the voltage signal measurement port group 12, the other electrodes are disconnected from the excitation signal control port group 11 and the voltage signal measurement port group 12, and the measurement of the electrodes connected to the excitation signal control port group 11 and the voltage signal measurement port group 12 at this time is not affected.
In some embodiments, referring to fig. 5, the set of fire signal control ports 11 includes a first fire signal control port 111 and a second fire signal control port 112. The first excitation signal control port 111 is used for being connected to a first electrode in the first group of electrodes 201 and outputting an excitation signal through the first electrode; the second excitation signal control port 112 is for connection to a second electrode in the first set of electrodes 201 and for receiving an excitation signal via the second electrode.
In this embodiment, the excitation signal control port set 11 may include a first excitation signal control port 111 and a second excitation signal control port 112, and the first set of electrodes 201 may also include a first electrode and a second electrode. The first electrode may be connected to the first excitation signal control port 111, and the second electrode may be connected to the second excitation signal control port 112, wherein the first electrode may be connected to the first excitation signal control port 111 through the switch module 14, and the second electrode may also be connected to the second excitation signal control port 112 through the switch module 14. The excitation signal control port 11 may output an excitation signal to the first electrode through the first excitation signal control port 111 and receive an excitation signal from the second electrode through the second excitation signal control port 112.
In some embodiments, referring to fig. 6, the voltage signal measurement port set 12 includes a first voltage signal measurement port 121 and a second voltage signal measurement port 122. The first voltage signal measurement port 121 is configured to be connected to a first electrode in the first group of electrodes 201 connected to the first excitation signal control port 11, and is configured to obtain a first voltage signal of the first electrode; the second voltage signal measurement port 122 is for connecting to a second electrode of the first set of electrodes 201 connected to the second excitation signal control port 112 and for obtaining a second voltage signal of the second electrode.
In the present embodiment, the voltage signal measurement port set 12 may include a first voltage signal measurement port 121 and a second voltage signal measurement port 122. The first electrode can be connected with a first voltage signal measuring port 121 in addition to the first excitation signal control port 111; in addition to being connected to the second excitation signal control port 112, the second electrode may also be connected to a second voltage signal measurement port 122, wherein the first electrode may be connected to the first voltage signal measurement port 121 through the switch module 14, and the second electrode may also be connected to the second voltage signal measurement port 122 through the switch module 14. The voltage signal measurement port set 12 can obtain a first voltage signal of the first electrode through the first voltage signal measurement port 121, obtain a second voltage signal of the second electrode through the second voltage signal measurement port 122, and input the first voltage signal and the second voltage signal to the measurement module 13, so that the measurement module 13 processes the first voltage signal and the second voltage signal.
In some embodiments, the measurement module 13 is further configured to obtain a third voltage signal between the first electrode and the second electrode according to the first voltage signal and the second voltage signal; and for obtaining a measured impedance of the at least one first set of electrodes 201 from the excitation signal and the third voltage signal, and for obtaining a contact impedance of the at least one electrode from the measured impedance.
After acquiring the first voltage signal and the second voltage signal, the measurement module 13 acquires a third voltage signal, that is, a voltage drop between the first electrode and the second electrode, according to the first voltage signal and the second voltage signal, and can acquire a measured impedance corresponding to the first group of electrodes 201 according to the excitation signal and the third voltage signal, because the first group of electrodes 201 can have various combinations, the measurement module 13 can acquire a measured impedance of at least one first group of electrodes 201, and acquire a contact impedance of one or more electrodes according to the measured impedance.
For example, referring to fig. 8, similarly, taking the example that the plurality of electrodes includes 2 excitation electrodes ISIN0, ISIN1, and 2 measurement electrodes VSEN0, VSEN1, and the object to be measured is a human body, if the first group of electrodes 201 includes the excitation electrode ISIN0 and the measurement electrode VSEN0, the excitation electrode ISIN0 may be the aforementioned first electrode, the measurement electrode VSEN0 may be the aforementioned second electrode, the excitation electrode ISIN0 may be simultaneously connected to the first excitation signal control port 111 and the first voltage signal measurement port 121, and the measurement electrode VSEN0 may be simultaneously connected to the second excitation signal control port 112 and the second voltage signal measurement port 122. An excitation signal can be output to the excitation electrode ISIN0 via the first excitation signal control port 111 and received from the measurement electrode VSEN0 via the second excitation signal control port 112. Correspondingly, the first voltage signal measurement port 121 obtains a first voltage signal of the excitation electrode ISIN0, the second voltage signal measurement port 122 obtains a second voltage signal of the measurement electrode VSEN0, the third voltage signal is a voltage drop between the excitation electrode ISIN0 and the measurement electrode VSEN0, and the measurement module 13 can obtain a corresponding first measurement impedance through the third voltage signal and the excitation signal.
Accordingly, by controlling the measurement electrode VSEN0 and the excitation electrode ISIN1 as the first group of electrodes 201, controlling the measurement electrode VSENI and the excitation electrode ISIN0 as the first group of electrodes 201, and controlling the measurement electrode VSEN0 and the measurement electrode VSENI as the first group of electrodes 201, accordingly, a second measurement impedance corresponding to the measurement electrode VSEN0 and the excitation electrode ISIN1, a third measurement impedance corresponding to the measurement electrode VSENI and the excitation electrode ISIN0, and a fourth measurement impedance corresponding to the measurement electrode VSEN0 and the measurement electrode VSENI can be obtained.
When any two electrodes of the plurality of electrodes are used as the first group of electrodes 201 to be respectively connected with the excitation signal control port group 11 and the voltage signal measurement port group 12, the contact positions of the connected any two electrodes and the object to be measured are different, so some of the corresponding measured impedances may include the human body impedance, and some of the corresponding measured impedances may not include the human body impedance. For example, if the excitation electrodes ISIN0 and ISIN1 are provided to be in contact with the left and right feet of the human body, respectively, the measurement electrodes VSEN0 and VSEN1 correspond to the excitation electrodes ISIN0 and ISIN1, respectively. If the first group of electrodes 201 includes the excitation electrode ISIN0 and the measurement electrode VSEN0, the excitation electrode ISIN0 and the measurement electrode VSEN0 both contact with the left foot of the human body, and therefore do not pass through the human body, the corresponding first measurement impedance does not include the human body impedance, and if the first group of electrodes 201 includes the measurement electrodes VSEN0 and VSENI, the measurement electrodes VSEN0 and VSENI respectively contact with the left foot and the right foot of the human body, and pass through the human body to form a loop, so the corresponding second measurement impedance includes the human body impedance. Accordingly, the contact impedance of some of the plurality of electrodes is independent of the body impedance, and the contact impedance of some of the plurality of electrodes is dependent on the body impedance.
In some embodiments, to obtain the analyte impedance, the set of voltage signal measurement ports 12 is further configured to connect to two measurement electrodes when the first set of electrodes 201 includes two excitation electrodes; and obtaining the measuring voltage of the two measuring electrodes; wherein the measuring electrode comprises an electrode of the plurality of electrodes 20 corresponding to the excitation electrode.
In this embodiment, in order to obtain the impedance of the object to be measured, when the first set of electrodes 201 includes two excitation electrodes, the voltage signal measurement port set 12 may be connected to two measurement electrodes, where the measurement electrodes include the electrode corresponding to the excitation electrode in the plurality of electrodes 20. For example, referring to fig. 8, when the first group of electrodes 201 includes excitation electrodes ISIN0 and ISIN1, at this time, the excitation electrodes ISIN0 and ISIN1 are respectively connected to the excitation signal control port group 11, and the measurement electrodes VSEN0 and VSEN1 can be controlled to be respectively connected to the voltage signal measurement port group 12 in order to obtain the impedance of the object to be measured, the voltage signal measurement port group 12 can obtain the corresponding measurement voltage, and input the measurement voltage into the measurement module 13.
In some embodiments, the measurement circuit 13 is further configured to obtain an impedance of the dut according to the excitation signal and the measurement voltage, and obtain a contact impedance of the at least one electrode according to the measurement impedance and the impedance of the dut. The measurement circuit 13 may receive the impedance of the object to be measured according to the excitation signal and the obtained measurement voltage, and obtain the contact impedance of at least one electrode according to the previously obtained measurement impedance in combination with the impedance of the object to be measured.
In some embodiments, referring to fig. 7, the contact impedance measuring circuit further includes an excitation module 15, where the excitation module 15 is connected to the excitation signal control port set 11, and is configured to generate a current signal, use the current signal as an excitation signal, and control the port set 11 to pass through the first set of electrodes 201 via the excitation signal.
As an embodiment, referring to fig. 8, the excitation module 15 may include a Direct Digital frequency Synthesizer 151 (DDS), a Digital-to-Analog Converter 152 (DAC), a Low Pass Filter 153 (LPF), and a signal processing module 154, where the DDS is configured to generate a preset Digital signal, the DDS is configured to convert the preset Digital signal into an Analog signal, the LPF is configured to perform Low Pass filtering on the Analog signal to obtain a sine wave signal, and the signal processing module 154 is configured to process the sine wave signal to obtain a current signal, i.e., the excitation signal in the present application. The accuracy of measuring the biological contact impedance is improved by generating a stable current signal through a direct digital frequency synthesizer, a digital-to-analog converter, a low-pass filter and a signal processing module.
For a better understanding of the present application, the measurement of the contact impedance of at least one electrode in the present application is illustrated with a plurality of electrodes as 4 electrodes, as an example. Referring to fig. 9, as described above, the contact impedances of the measurement electrode VSEN0, the measurement electrode VSEN1, the excitation electrode ISIN0, and the excitation electrode ISIN1 are R1, R2, R3, and R4, respectively, the first measurement impedance corresponding to the excitation electrode ISIN0 and the measurement electrode ISIN0 is Z0, the second measurement impedance corresponding to the measurement electrode VSEN0 and the excitation electrode ISIN1 is Z1, the third measurement impedance corresponding to the measurement electrode VSENI and the excitation electrode ISIN0 is Z2, the fourth measurement impedance corresponding to the measurement electrode VSEN0 and the measurement electrode VSENI is Z3, and the impedance of the object to be measured is RB. By combining the different electrodes with each other, the measured impedance of the plurality of first set of electrodes 201 can be obtained:
the first measurement impedance Z0 between the measurement electrode VSEN0 and the excitation electrode ISIN0 is:
Z0＝R1+R3
the second measurement impedance Z1 between the measurement electrode VSEN0 and the excitation electrode ISIN1 is:
Z1＝R1+R4+RB
a third measured impedance Z2 between the measurement electrode VSENI and the excitation electrode ISIN0 is:
Z2＝R2+R3+RB
the fourth measurement impedance Z3 between the measurement electrode VSEN0 and the measurement electrode VSENI is:
Z3＝R1+R2+RB
the values of the respective contact resistances R1, R2, R3, R4 can be obtained by the above formulas:
R1＝(Z0-Z2+Z3)/2
R2＝(Z2+Z3-Z0)/2-RB
R3＝(Z0+Z2-Z3)/2
R4＝Z1-(Z1+Z4-Z3)/2-RB
as can be seen from the above-mentioned formulas for obtaining contact impedances, in the embodiment using four electrodes as an example, some contact impedances such as R1, R2 and R3 do not need to be obtained, and some contact impedances have values independent of the body impedance such as R1 and R3, so that the contact impedances of some electrodes can be obtained without obtaining all the measured impedances or the body impedance.
As another example, the contact impedance measuring circuit 100 may also be used for measuring contact impedance of a plurality of electrodes such as 6 electrodes or 8 electrodes. Referring to fig. 10, two electrodes may be added on the basis of fig. 8, the two newly added electrodes may be an electrode VSEN2 and an electrode VSEN3, and the corresponding contact impedances are R5 and R6, so that VSEN0, VSEN1, ISIN0, and ISIN1 may form four electrodes, and the corresponding measured impedance of the object to be measured is RB0; VSEN2, VSEN3, ISIN0 and ISIN1 form new four electrodes, and the correspondingly measured impedance of the object to be measured is RB1; the measurement of the contact impedance is the same as above, and will not be described in detail here.
In this embodiment, at least one group of electrodes may be simultaneously connected to the excitation signal control port group 11 and the voltage signal measurement port group 12 in a manner that a plurality of electrodes are arbitrarily combined two by two, and then the measurement module obtains the measurement impedance of at least the first group of electrodes, so as to obtain the contact impedance of at least one electrode; the method and the device realize the measurement of the contact impedance of at least one electrode, improve the accuracy of the measurement of the contact impedance, reduce the influence of the contact impedance on the measurement of the biological impedance in the actual measurement and improve the accuracy of the measurement of the biological impedance.
The embodiment of the present application provides a contact impedance measuring method, which can be applied to the contact impedance measuring circuit in the above embodiment, and the contact impedance measuring method includes:
outputting or receiving an excitation signal through a first group of electrodes connected with the excitation signal control port group; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes;
acquiring voltage signals of the first group of electrodes through the voltage signal measurement port group;
a measured impedance of the at least one first set of electrodes is obtained from the excitation signal and the voltage signal and used to obtain a contact impedance of the at least one electrode from the measured impedance.
In some embodiments, the contact impedance measurement method further comprises: when the first group of electrodes comprises two excitation electrodes, acquiring the measurement voltages of the two measurement electrodes through the voltage signal measurement port group; wherein the measuring electrode includes an electrode corresponding to the excitation electrode among the plurality of electrodes. And obtaining the impedance of the object to be measured according to the excitation signal and the measurement voltage, and obtaining the contact impedance of at least one electrode according to the measurement impedance and the impedance of the object to be measured.
In some embodiments, the contact impedance measurement method further comprises: and controlling the connection state of each electrode with the excitation signal control port group and the voltage signal measurement port group respectively.
For the specific description of the method, reference may be made to the specific description of the foregoing embodiments, which are not repeated in this embodiment.
According to the contact impedance measuring method provided by the embodiment of the application, the first group of electrodes connected with the excitation signal control port group outputs or receives excitation signals; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes; acquiring voltage signals of the first group of electrodes through the voltage signal measurement port group; acquiring the measured impedance of at least one first group of electrodes according to the excitation signal and the voltage signal, and obtaining the contact impedance of at least one electrode according to the measured impedance; at least one group of electrodes can be simultaneously connected to the excitation signal control port group and the voltage signal measurement port group in a mode of randomly combining a plurality of electrodes in pairs, and then the measurement impedance of at least a first group of electrodes is obtained through the measurement module, so that the contact impedance of at least one electrode is obtained; the method and the device realize the measurement of the contact impedance of at least one electrode, improve the accuracy of the measurement of the contact impedance, reduce the influence of the contact impedance on the measurement of the biological impedance in the actual measurement and improve the accuracy of the measurement of the biological impedance.
Referring to fig. 11, the contact impedance measuring apparatus 300 includes a contact impedance measuring circuit 100 and a plurality of electrodes 20, wherein the plurality of electrodes and the contact impedance measuring circuit 100.
In some embodiments, referring to fig. 12, the contact impedance measuring apparatus further includes a switch module 14 for controlling the connection state of each electrode with the excitation signal control port set 11 and the voltage signal measurement port set 12. The switch module may be provided in the contact impedance measuring circuit 100, in addition to the contact impedance measuring circuit 100, as long as it can control the connection state of the plurality of electrodes 20 with the excitation signal control port group 11 and the voltage signal measuring port group 12, respectively.
In the embodiment of the present application, referring to fig. 13, a chip 400 includes a contact impedance measuring circuit 100.
An embodiment of the present application provides an electronic apparatus 500 including an apparatus main body on which a plurality of electrodes 20 are disposed, and a contact impedance measurement device 300. Referring to fig. 14 and 15, the electronic device 500 may further include a chip 400, or a contact impedance measuring circuit 100. The electronic device 400 may be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a touch pen, a true wireless headset, an automobile, a smart wearable device, and a mobile terminal. The intelligent wearable device comprises but not limited to an intelligent watch, an intelligent bracelet and a cervical vertebra massager. Mobile terminals include, but are not limited to, smart phones, laptops, tablets, point of sale (POS) machines.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express preferred embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A contact impedance measurement circuit, comprising:
the excitation signal control port set is used for being connected with the first group of electrodes and outputting or receiving excitation signals through the first group of electrodes; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes;
the voltage signal measurement port set is used for being connected with the first group of electrodes connected with the excitation signal control port set and acquiring voltage signals of the first group of electrodes;
and the measuring module is used for acquiring the measured impedance of at least one first group of electrodes according to the excitation signal and the voltage signal and acquiring the contact impedance of at least one first group of electrodes according to the measured impedance.
2. The contact impedance measurement circuit of claim 1, wherein the set of excitation signal control ports includes a first excitation signal control port and a second excitation signal control port;
the first excitation signal control port is used for being connected to a first electrode in the first group of electrodes and outputting the excitation signal through the first electrode;
the second excitation signal control port is for connection to a second electrode of the first set of electrodes and for receiving the excitation signal via the second electrode.
3. The contact impedance measurement circuit of claim 2, wherein the set of voltage signal measurement ports comprises a first voltage signal measurement port and a second voltage signal measurement port;
the first voltage signal measurement port is used for being connected to the first electrode in the first group of electrodes connected with the first excitation signal control port and obtaining a first voltage signal of the first electrode;
the second voltage signal measurement port is used for being connected to the second electrode in the first group of electrodes connected with the second excitation signal control port and obtaining a second voltage signal of the second electrode.
4. The contact impedance measurement circuit of claim 3, wherein the measurement module is further configured to:
acquiring a third voltage signal between the first electrode and the second electrode according to the first voltage signal and the second voltage signal;
obtaining a measured impedance of at least one of the first set of electrodes from the excitation signal and the third voltage signal;
obtaining the contact impedance of at least one of the electrodes from the measured impedance.
5. The contact impedance measurement circuit of claim 1, wherein the set of voltage signal measurement ports are further configured to:
when the first set of electrodes comprises two excitation electrodes, connecting to two measurement electrodes;
acquiring the measuring voltages of the two measuring electrodes; wherein the measurement electrode comprises an electrode of the plurality of electrodes corresponding to the excitation electrode.
6. The contact impedance measurement circuit of claim 5, wherein the measurement module is further configured to:
and obtaining the impedance of an object to be measured according to the excitation signal and the measurement voltage, and obtaining the contact impedance of at least one electrode according to the measurement impedance and the impedance of the object to be measured.
7. The contact impedance measurement circuit of any one of claims 1-6, further comprising:
and the switch module is used for controlling the connection state of each electrode with the excitation signal control port group and the voltage signal measurement port group respectively.
8. The contact impedance measurement circuit of claim 7, wherein the switch module is configured to: when the first group of electrodes are controlled to be respectively connected with the excitation signal control port group and the voltage signal measurement port group, the second group of electrodes are controlled to be disconnected with the excitation signal control port group and the voltage signal measurement port group; wherein the second set of electrodes comprises electrodes of the plurality of electrodes other than the first set of electrodes.
9. A contact impedance measuring method, characterized by comprising:
outputting or receiving an excitation signal through a first group of electrodes connected with the excitation signal control port group; wherein the first set of electrodes comprises any two electrodes of a plurality of electrodes;
acquiring voltage signals of the first group of electrodes through a voltage signal measuring port group;
and acquiring the measured impedance of at least one first group of electrodes according to the excitation signal and the voltage signal, and obtaining the contact impedance of at least one first group of electrodes according to the measured impedance.
10. The contact impedance measurement method of claim 9, further comprising:
when the first group of electrodes comprises two excitation electrodes, acquiring the measurement voltages of the two measurement electrodes through the voltage signal measurement port group; wherein the measurement electrode comprises an electrode of the plurality of electrodes corresponding to the excitation electrode.
And obtaining the impedance of an object to be measured according to the excitation signal and the measurement voltage, and obtaining the contact impedance of at least one electrode according to the measurement impedance and the impedance of the object to be measured.
11. The contact impedance measurement method of claim 9, further comprising:
and controlling the connection state of each electrode with the excitation signal control port group and the voltage signal measurement port group respectively.
12. A contact impedance measuring device comprising the contact impedance measuring circuit according to any one of claims 1 to 8 and a plurality of electrodes connected to the contact impedance measuring circuit.
13. The contact impedance measurement device of claim 12, further comprising:
and the switch module is used for controlling the connection state of each electrode with the excitation signal control port group and the voltage signal measurement port group respectively.
14. A chip comprising the contact impedance measurement circuit of any one of claims 1-8.
15. An electronic device comprising the contact impedance measurement circuit of any one of claims 1 to 8, or the contact impedance measurement device of any one of claims 12 to 13, or the chip of claim 14.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210921746.0A CN115363556A (en) | 2022-08-02 | 2022-08-02 | Contact impedance measuring circuit, method and device, chip and electronic equipment |
| PCT/CN2023/109844 WO2024027592A1 (en) | 2022-08-02 | 2023-07-28 | Circuit, method, and apparatus for measuring contact impedance, chip, and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210921746.0A CN115363556A (en) | 2022-08-02 | 2022-08-02 | Contact impedance measuring circuit, method and device, chip and electronic equipment |
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| CN115363556A true CN115363556A (en) | 2022-11-22 |
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| CN202210921746.0A Pending CN115363556A (en) | 2022-08-02 | 2022-08-02 | Contact impedance measuring circuit, method and device, chip and electronic equipment |
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| CN (1) | CN115363556A (en) |
| WO (1) | WO2024027592A1 (en) |
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| WO2024027592A1 (en) * | 2022-08-02 | 2024-02-08 | 西安芯海微电子科技有限公司 | Circuit, method, and apparatus for measuring contact impedance, chip, and electronic device |
| WO2024032722A1 (en) * | 2022-08-11 | 2024-02-15 | 芯海科技（深圳）股份有限公司 | Contact impedance measurement circuit and method, detection apparatus, chip, and electronic device |
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| CN211962043U (en) * | 2019-12-20 | 2020-11-20 | 芯海科技（深圳）股份有限公司 | Measuring device and measuring apparatus |
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| CN114431863A (en) * | 2020-11-03 | 2022-05-06 | 深圳迈瑞生物医疗电子股份有限公司 | System for measuring electrode contact impedance and impedance measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115363556A (en) * | 2022-08-02 | 2022-11-22 | 西安芯海微电子科技有限公司 | Contact impedance measuring circuit, method and device, chip and electronic equipment |
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2022
- 2022-08-02 CN CN202210921746.0A patent/CN115363556A/en active Pending
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| US20150293045A1 (en) * | 2014-04-11 | 2015-10-15 | Texas Instruments Incorporated | Measuring electrode impedance in an impedance measurement circuit |
| US20150305648A1 (en) * | 2014-04-24 | 2015-10-29 | Texas Instruments Incorporated | Impedance measurement circuit |
| CN211962043U (en) * | 2019-12-20 | 2020-11-20 | 芯海科技（深圳）股份有限公司 | Measuring device and measuring apparatus |
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| WO2024027592A1 (en) * | 2022-08-02 | 2024-02-08 | 西安芯海微电子科技有限公司 | Circuit, method, and apparatus for measuring contact impedance, chip, and electronic device |
| WO2024032722A1 (en) * | 2022-08-11 | 2024-02-15 | 芯海科技（深圳）股份有限公司 | Contact impedance measurement circuit and method, detection apparatus, chip, and electronic device |
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| WO2024027592A1 (en) | 2024-02-08 |
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