CN117562527A - Bioimpedance detection circuit, contact state detection method, chip and electronic equipment - Google Patents
Bioimpedance detection circuit, contact state detection method, chip and electronic equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7221—Determining signal validity, reliability or quality
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The application relates to the technical field of health measurement, and provides a bioimpedance detection circuit, a contact state detection method, a chip and electronic equipment, wherein the bioimpedance detection circuit comprises a first excitation source; the switch network circuit is used for sequentially connecting any two electrodes with two ends of the first excitation source respectively to form corresponding detection loops; the first voltage measuring circuit is used for acquiring a first measuring voltage signal corresponding to the detection loop; the control circuit is used for acquiring the impedance of the corresponding detection loop according to the first alternating current signal and the first measurement voltage signal and acquiring the contact state of the electrode according to the impedance of the detection loop; by the mode, when in-place judgment is needed for a specific electrode, the impedance of the detection loop formed by the electrode and any one other electrode can be obtained respectively, the contact state of the electrode can be obtained according to the impedance of all the detection loops where the electrode is positioned, whether the electrode falls off or not is judged accurately, and the in-place judgment accuracy of the electrode is improved.
Description
Technical Field
The application relates to the technical field of health measurement, in particular to a bioimpedance detection circuit, a contact state detection method, a chip and electronic equipment.
Background
The bio-impedance detection device mostly adopts a bio-impedance analysis method (Bioelectrical Impedance Analysis, BIA) to carry out bio-impedance detection, the detection method is convenient and the measurement result is accurate, the bio-impedance detection device generally comprises at least two groups of electrode pairs corresponding to at least two different contact parts of a human body respectively, each group of electrode pairs comprises two electrodes, one electrode is used for transmitting a current signal to the contact part of the human body, the other electrode is used for receiving a voltage signal generated by the current signal passing through the human body, the corresponding human body part impedance is calculated according to the current signal transmitted by the electrode pairs positioned at the different contact parts and the acquired voltage signal, and then the human body impedance is calculated according to the combination of the different human body part impedances.
To prevent abnormal measurement results, BIA systems are often added to in-situ detection to determine if the electrode is in good contact with the measurement target. At present, the common in-situ detection means in the background technology can only judge that the electrode falls off in a plurality of electrodes, but can not accurately judge which electrode falls off, which is not beneficial to improving the accuracy of in-situ judgment of the electrodes.
Disclosure of Invention
In view of the above, embodiments of the present application provide a bio-impedance detection circuit, a contact state detection method, a chip, and an electronic device, so as to solve the above technical problems.
In a first aspect, embodiments of the present application provide a bioimpedance detection circuit, including:
the first excitation source is used for providing a first alternating current signal with a first frequency;
the switch network circuit is used for sequentially connecting any two electrodes in the plurality of electrodes to two ends of the first excitation source respectively so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop;
the first voltage measuring circuit is used for acquiring a first measuring voltage signal corresponding to the detection loop;
and the control circuit is used for acquiring the corresponding impedance of the detection loop according to the first alternating current signal and the first measurement voltage signal and acquiring the contact state of the electrode according to the impedance of the detection loop.
In a second aspect, an embodiment of the present application provides a contact state detection method, including:
sequentially connecting any two electrodes in a plurality of electrodes to two ends of a first excitation source respectively, so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop, and the first excitation source provides a first alternating current signal with a first frequency for the detection loop;
acquiring a first measurement voltage signal corresponding to the detection loop;
acquiring the impedance of the detection loop according to the first alternating current signal and the first measurement voltage signal;
and acquiring the contact state of the electrode according to the impedance of the detection loop.
In a third aspect, embodiments of the present application provide a chip including the bioimpedance detection circuit described above.
In a fourth aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the chip described above.
The bio-impedance detection circuit, the contact state detection method, the chip and the electronic device provided by the embodiment of the application comprise the following steps: the first excitation source is used for providing a first alternating current signal with a first frequency; the switch network circuit is used for sequentially connecting any two electrodes in the plurality of electrodes to two ends of the first excitation source respectively so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop; the first voltage measuring circuit is used for acquiring a first measuring voltage signal corresponding to the detection loop; the control circuit is used for acquiring the corresponding impedance of the detection loop according to the first alternating current signal and the first measurement voltage signal and acquiring the contact state of the electrode according to the impedance of the detection loop; by the method, any two electrodes are sequentially connected to the two ends of the first excitation source respectively, the first measurement voltage signals of the corresponding detection loops are obtained, when the specific electrodes are required to be subjected to in-place judgment, the impedance of the detection loops formed by the electrodes and any one other electrode can be obtained respectively, the contact state of the electrodes can be obtained according to the impedance of all the detection loops where the electrodes are located, whether the electrodes fall off or not is accurately judged, and the in-place judgment accuracy of the electrodes is improved.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
Fig. 1 shows a schematic diagram of electrode in-situ detection in the background art.
Fig. 2 shows an application scenario diagram of the bio-impedance detection circuit provided in the embodiment of the present application.
Fig. 3 shows a schematic structural diagram of a bio-impedance detection circuit according to an embodiment of the present application.
Fig. 4 shows a schematic structural diagram of a bio-impedance detection circuit according to an embodiment of the present application.
Fig. 5 shows a schematic diagram of parasitic capacitance formation in the electrode bit detection in the background art.
Fig. 6 shows a schematic structural diagram of a bio-impedance detection circuit according to an embodiment of the present application.
Fig. 7 shows a schematic structural diagram of a bio-impedance detection circuit according to an embodiment of the present application.
Fig. 8 is a schematic diagram illustrating the principle of detecting the loop current flow in the bio-impedance detection circuit according to the embodiment of the present application.
Fig. 9 shows a schematic structural diagram of a contact state detection method provided in an embodiment of the present application.
Fig. 10 shows a schematic structural diagram of a chip provided in an embodiment of the present application.
Fig. 11 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In order to better understand the solution of the present application, the following description will make clear and complete descriptions of the technical solution of the embodiment of the present application with reference to the accompanying drawings in the embodiment of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of embodiments of the present application, words such as "example" or "such as" are used to indicate exemplary, illustrative, or descriptive matter. Any embodiment or design described herein as "example" or "such as" is not necessarily to be construed as preferred or advantageous over another embodiment or design. The use of words such as "example" or "such as" is intended to present relative concepts in a clear manner.
In addition, the term "plurality" in the embodiments of the present application means two or more, and in view of this, the term "plurality" may be understood as "at least two" in the embodiments of the present application. "at least one" may be understood as one or more, for example as one, two or more. For example, including at least one means including one, two or more, and not limiting what is included, e.g., including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C, may be included.
It should be noted that, in the embodiment of the present application, "and/or" describe the association relationship of the association object, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship.
It should be noted that in the embodiments of the present application, "connected" is understood to mean electrically connected, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.
Referring to fig. 1, an excitation source emits excitation current to two excitation signal electrodes, a voltmeter detects voltage between two voltage detection electrodes, zb represents bio-impedance, zcc 'and Zcc' represent electrode contact impedance between the excitation signal electrodes and a measurement target, zcc 'and Zcc' represent electrode contact impedance between the voltage detection electrodes and the measurement target, respectively, and a common in-situ detection method in the background art is to judge whether voltage detected by the voltmeter is stable and/or exceeds a preset range, and if an unstable and/or out-of-range phenomenon occurs, prompt abnormal contact of the electrodes to indicate that at least one electrode of the four electrodes shown in fig. 1 is dropped. The method cannot accurately judge which electrode falls off, and is not beneficial to improving the accuracy of electrode in-place judgment.
The bio-impedance detection circuit 100 provided by the application can be applied to the bio-impedance detection device 200 shown in fig. 2, wherein the bio-impedance detection device 200 comprises a first electrode 201, a second electrode 202, a third electrode 203 and a fourth electrode 204, and the bio-impedance detection circuit 100 is electrically connected with the first electrode 201, the second electrode 202, the third electrode 203 and the fourth electrode 204 respectively. In detecting the impedance of a measurement target such as a human body, the first electrode 201 and the second electrode 202 are used to contact the first side of the measurement target, the third electrode 203 and the fourth electrode 204 are used to contact the second side of the measurement target, and the bioimpedance detection circuit 100 may detect the contact state of at least one of the first electrode 201, the second electrode 202, the third electrode 203, and the fourth electrode 204 with the measurement target in addition to detecting the impedance of the measurement target.
An embodiment of the present application provides a bio-impedance detection circuit 100, referring to fig. 3, the bio-impedance detection circuit 100 of the present embodiment includes: a first excitation source 11, a switching network circuit 12, a first voltage measurement circuit 13, and a control circuit 14.
Wherein the first excitation source 11 is configured to provide a first ac signal at a first frequency.
The switching network circuit 12 is configured to sequentially connect any two electrodes 10 of the plurality of electrodes 10 to two ends of the first excitation source 10, so that any two electrodes 10 sequentially form a corresponding detection loop with the first excitation source 10.
The first voltage measurement circuit 13 is configured to obtain a first measurement voltage signal corresponding to the detection loop. In the present embodiment, the first voltage measurement circuit 13 may sequentially acquire the first measurement voltage signal of the detection loop formed by each two electrodes 10.
The control circuit 14 is configured to obtain the impedance of the corresponding detection circuit according to the first ac signal and the first measurement voltage signal, and obtain the contact state of the electrode 10 according to the impedance of the detection circuit. In this embodiment, by the control circuit 14 and the switch network circuit 12, it is realized that any two electrodes 10 are sequentially connected to two ends of the first excitation source 11 respectively, so as to obtain the first measurement voltage signal of the corresponding detection circuit, when the specific electrode needs to be subjected to in-situ judgment, the impedance of the detection circuit formed by the electrode and any one of the other electrodes can be obtained respectively, the contact state of the electrode can be obtained according to the impedance of all the detection circuits where the electrode is located, whether the electrode falls off or not can be accurately judged, and the accuracy of in-situ judgment of the electrode is facilitated.
In one application scenario of the embodiment, the switching network circuit 12 may switch the connection states of each electrode 10 and the first excitation source 11, so as to sequentially connect each two electrodes 10 to two ends of the first excitation source 11, so that any two electrodes 10 may respectively form a detection loop with the first excitation source 11; the first voltage measurement circuit 13 may sequentially acquire a first measurement voltage signal of a detection loop formed by each two electrodes 10; the control circuit 14 may obtain the contact state of each electrode 10 based on the impedance of the detection loop. As an embodiment, the control circuit 14 is further configured to: if the impedance of the detection loop formed by the two electrodes 10 meets the preset contact condition, it is determined that the contact states of the two electrodes 10 are normal.
In the present embodiment, if the sum of the contact resistances of the two electrodes 10 meets the preset contact condition, the contact states of the two electrodes 10 are normal. The impedance of the detection loop formed by any two electrodes 10 and the first excitation source is the sum of two contact impedances formed by the two electrodes 10 and the measurement target respectively. The preset contact condition may be that the impedance of the detection loop is smaller than a preset impedance threshold, and when the preset contact condition is not met, the impedance of the detection loop is larger than or the impedance of the detection loop is unstable or the impedance of the detection loop is equal to a preset impedance threshold, and the preset impedance threshold may be used to represent an open circuit of the detection loop or may be a resistance value of a resistance unit connected in parallel with the detection loop. If the sum of the contact resistances of the two electrodes 10 does not meet the preset contact condition, the contact state of at least one electrode 10 of the two electrodes 10 is dropped, and it is necessary to further determine the contact state of the two electrodes 10 by combining with whether the resistance of the other detection circuit meets the preset contact condition.
In some embodiments, the control circuit 14 is further configured to: if the impedance of all the detection loops where the electrode 10 is located does not meet the preset contact condition, the contact state of the electrode 10 is determined to be falling off.
In the present embodiment, when each detection circuit in which the electrode 10 is located does not meet the preset contact condition, it may be determined that the electrode 10 is detached.
In some embodiments, when no resistor unit connected in parallel to the detection loop is provided, if at least one electrode 10 in the detection loop falls off, the contact impedance formed by the fallen electrode 10 and the measurement target is larger, the corresponding detection loop is close to an open circuit, and the impedance of the detection loop is larger than a preset impedance threshold value or instability for representing the open circuit. If the electrode 10 does not fall off in the detection loop, the contact impedance formed by the two electrodes 10 and the measurement target is smaller, the impedance of the corresponding detection loop is smaller, and the impedance of the detection loop is smaller than a preset impedance threshold used for representing an open circuit.
As an implementation manner, referring to fig. 4, the bio-impedance detection circuit 100 of the present embodiment further includes a resistor unit 19, where the resistor unit 19 is connected to two ends of the first excitation source 11.
In the present embodiment, when the electrode 10 is dropped in the detection circuit, the contact resistance between the dropped electrode 10 and the measurement target is large, and the corresponding detection circuit is close to an open circuit, so that the first measurement voltage signal of the detection circuit formed by the two electrodes 10 acquired by the first voltage measurement circuit 13 is actually the first measurement voltage signal formed by the first ac signal through the resistor unit 19, and the impedance of the detection circuit formed by the two electrodes 10 acquired by the control circuit 14 based on the first ac signal and the first measurement voltage signal is actually the resistance value of the resistor unit 19. By the mode, whether the detection loop is open or not is judged more easily, and the accuracy of electrode contact state detection is improved. When the electrode 10 does not fall off in the detection loop, the contact impedance formed between the two electrodes 10 and the measurement target is smaller, the impedance of the corresponding detection loop is the resistance value of the equivalent resistance corresponding to the parallel connection of the two electrodes 10 and the resistance unit 19 after the contact impedance of the two electrodes 10 is connected in series, so the first measurement voltage signal of the detection loop formed by the two electrodes 10 obtained by the first voltage measurement circuit 13 is actually the first measurement voltage signal formed by the first alternating current signal through the equivalent resistance, and the impedance of the detection loop formed by the two electrodes 10 obtained by the control circuit 14 according to the first alternating current signal and the first measurement voltage signal is smaller than the resistance value of the resistance unit 19.
In some embodiments, the resistance value of the resistance unit 19 is a preset resistance threshold; the control circuit 14 is also configured to: if the impedance of the detection loop formed by the two electrodes 10 is smaller than a preset resistance threshold, determining that the contact states of the two electrodes are normal respectively; if the impedance of all the detection loops in which the electrode 10 is located is equal to the preset resistance threshold, the contact state of the electrode 10 is determined to be falling off.
Referring to fig. 5, in the electrode in-place measurement mode of the background art, an ac excitation circuit for transmitting a current signal is often affected by a parasitic capacitance of the circuit, resulting in an in-place judgment error, for example, when an electrode for transmitting a current signal to a human body contact part falls off, it is difficult to determine whether the voltage detection is stable or out of range because the parasitic capacitance can pass through the ac signal; and the method needs to consume main control resources to handle abnormal contact.
As an embodiment, the first frequency may be less than a preset frequency threshold. For example, the preset frequency threshold may be 10kHz, at which time the first ac signal is a low frequency ac signal. According to capacitive reactance definition Wherein X is c The parasitic capacitance and resistance value are respectively C and f, and the frequency of the alternating current signal is respectively f. It is known that the lower the frequency is, the larger the resistance value of the parasitic capacitance is, the closer to an open circuit is when the electrode falls off, and reducing the first frequency can reduce the influence of the parasitic capacitance, thereby being beneficial to improving the accuracy of detecting the electrode contact state.
In the present embodiment, the electrode contact state is detected by the low-frequency first ac signal, and the bioimpedance is detected by the high-frequency ac signal, which is advantageous in improving the accuracy of detecting the electrode contact state.
As an embodiment, in order to improve efficiency, the electrode contact state detection and the bio-impedance detection may be performed simultaneously, and two ac signals, namely a low-frequency first ac signal and a high-frequency ac signal for bio-impedance detection, may be present in the system, and, for example, the first current signal actually flowing through each detection loop may include the first ac signal and the high-frequency ac signal for bio-impedance detection at the same time; in order to avoid the high-frequency ac signal interfering with the detection of the electrode contact state of the first ac signal, the bio-impedance detection circuit 100 of the present embodiment further includes: the first frequency selection circuit 15, the first frequency selection circuit 15 is connected to the first excitation source 11 and the first voltage measurement circuit 13, respectively, for extracting a first ac signal of a first frequency from the first current signal flowing through the detection circuit.
As an embodiment, referring to fig. 6, the plurality of electrodes 10 includes at least one set of first electrode units 10a and at least one set of second electrode units 10b, the first electrode units 10a include two first electrodes 10-a, and the two first electrodes 10-a are respectively connected to a first side and a second side of the measurement target; the second electrode unit 10b includes two second electrodes 10-b, and the two second electrodes 10-b are connected to the first side and the second side of the measurement target, respectively; the bioimpedance detection circuit 100 of the present embodiment further includes: a second excitation source 16, a second voltage measurement circuit 17, and a second frequency selection circuit 18.
Wherein the second excitation source 16 is configured to provide a second ac signal with a second frequency, and two ends of the second excitation source 16 are respectively connected to the two first electrodes 10-a in each group of the first electrode units 10a, so as to provide the second ac signal to the measurement target; the two ends of the second voltage measuring circuit 17 are respectively connected to the two second electrodes 10-b in each group of the second electrode units 10b, and the second voltage measuring circuit 17 is used for acquiring second measurement voltage signals of the two second electrodes 10-b in the second electrode units 10b forming a detection loop, wherein the second measurement voltage signals are voltage differences between the first side and the second side of the measurement target. The bioimpedance of the measurement target can be obtained from the second alternating current signal and the second measurement voltage signal. The second voltage measuring circuit 17 and the second frequency selecting circuit 18 are used for bio-impedance detection, the first electrode 10-a in the first electrode unit 10a transmits a second alternating current signal of a second frequency to the measurement target, and the second electrode 10-b in the second electrode unit 10b measures a second measurement voltage signal generated by the second alternating current signal passing through the measurement target, and the second frequency is larger than the first frequency. The second frequency may be, for example, 50kHz to 250Hz.
Wherein the second frequency selection circuit 18 is connected to the second voltage measurement circuit 17, the second current signal, which exemplarily actually flows through the measurement target, may include a first ac signal and a second ac signal due to the presence of the first ac signal; in order to avoid interference of the bio-impedance measurement by the first ac signal, the second frequency selection circuit 18 is arranged to extract a second ac signal of a second frequency from the second current signal flowing through the loop formed between the first side and the second side of the measurement target.
In this embodiment, the second frequency selection circuit 18 is configured to avoid the first ac signal interfering with the bio-impedance detection of the second ac signal, which is beneficial to improving the accuracy of the bio-impedance detection.
In some embodiments, the first frequency selection circuit 15 comprises a low pass filter and the second frequency selection circuit 18 comprises a high pass filter. The low-pass filter passes the first alternating-current signal of the first frequency and cuts off the second alternating-current signal of the second frequency, and the high-pass filter passes the second alternating-current signal of the second frequency and cuts off the first alternating-current signal of the first frequency.
As an embodiment, as shown in fig. 6, the switching network circuit 12 includes a plurality of switch units, where the switch units are disposed in one-to-one correspondence with the plurality of electrodes 10, the switch units include a first switch 121 and a second switch 122, the first switch 121 is used to connect the corresponding electrode 10 to the first end of the first excitation source 11, and the second switch 122 is used to connect the corresponding electrode 10 to the second end of the first excitation source 11.
In the present embodiment, when two different electrodes 10 are required to form a detection circuit, the two electrodes 10 may be connected to both ends of the first excitation source 11, and the control circuit 14 may control the first oneThe first switch 121 of the electrode 10 and the second switch 122 of the second electrode 10 are respectively closed, and the other switches are opened; the control circuit 14 may also control the second switch 122 of the first electrode 10 and the first switch 121 of the second electrode 10 to be closed respectively, and the other switches to be opened. The control circuit 14 sequentially forms each two electrodes 10 and the first excitation source 11 into a detection loop through controlling the switch network circuit 12 so as to acquire the impedance of each two electrodes 10 forming the detection loop. As shown in FIG. 6, Z cc The contact impedance of the electrodes 10 and the measurement target is respectively, and the impedance of a detection loop formed by each two electrodes 10 is the sum of the contact impedance of the two electrodes; z is Z b And (3) bioimpedance.
In some embodiments, referring to FIG. 7, assuming that the number of electrodes is four, and the numbers of the four electrodes 10 are 10-1, 10-2, 10-3 and 10-4, if the electrode 10-1 is dropped, the electrode 10-2, the electrode 10-3 and the electrode 10-4 are normal, the electrode 10-1 participates in the formed detection loop: the detection loop 1-2 formed by the electrode 10-1 and the electrode 10-2, the detection loop 1-3 formed by the electrode 10-1 and the electrode 10-3, the detection loop 1-4 formed by the electrode 10-1 and the electrode 10-4 are respectively open circuits, and the corresponding impedance of the detection loop 1-2, the detection loop 1-3 and the detection loop 1-4 is respectively R open Wherein R is open To preset the resistance threshold, it may be determined that the electrode 10-1 is falling off. The impedance of the detection circuit 2-3 formed by the electrode 10-2 and the electrode 10-3, the impedance of the detection circuit 2-4 formed by the electrode 10-2 and the electrode 10-4, and the impedance of the detection circuit 3-4 formed by the electrode 10-3 and the electrode 10-4 are smaller than R open The contact states of the electrode 10-2, the electrode 10-3 and the electrode 10-4 were determined to be normal. With continued reference to FIG. 7, if the detection loop 1-2 formed by the electrode 10-1 and the electrode 10-2 is open, the detection loop 1-3 formed by the electrode 10-1 and the electrode 10-3 is open, the detection loop 1-4 formed by the electrode 10-1 and the electrode 10-4 is open, the detection loop 2-3 formed by the electrode 10-2 and the electrode 10-3 is open, the detection loop 2-4 formed by the electrode 10-2 and the electrode 10-4 is open, and the detection loop 3-4 formed by the electrode 10-3 and the electrode 10-4 is normal, the contact states of the electrode 10-1 and the electrode 10-2 are respectively disengaged, and the contact states of the electrode 10-3 and the electrode 10-4 are respectively normal.
Referring to fig. 8, as described above with respect to the resistor unit 19, in order to more easily determine whether the detection circuit is open, the resistor unit 19 may be provided, assuming that the electrode 10-1 and the electrode 10-2 are connected to two ends of the first excitation source 11 to form a detection circuit, and current in the detection circuit sequentially passes through the electrode 10-1 and the electrode 10-2 from one end of the first excitation source 11 to the other end of the first excitation source 11, and simultaneously, the first excitation source 11 and the resistor unit 19 form another circuit in which current passes through the resistor unit 19 from one end of the first excitation source 11 to the other end of the first excitation source 11. By measuring the resistance of the resistor 19 to determine whether the corresponding detection circuit is abnormal, if the resistor 19 is OPEN, it can be determined that the detection circuit 1-2 formed by the electrode 10-1 and the electrode 10-2 is OPEN, and so on, which electrode contact state is abnormal can be determined according to the result of each detection circuit.
As an embodiment, the control circuit 14 is further configured to control the switching network circuit 12, so that the switching network circuit 12 sequentially connects each of the two electrodes 10 to both ends of the first excitation source 11.
In some implementations, the bio-impedance detection circuit 100 of this embodiment further includes a main control module, and the main control module may obtain the bio-impedance according to the second measurement voltage signal and the second ac signal.
In the embodiment, the electrode contact state detection is performed without consuming resources of the main control module, so that the efficiency of bioimpedance detection is improved.
In some embodiments, the control circuit 14 may send information of the electrode 10 whose contact state is falling off to the main control module.
An embodiment of the present application provides a contact state detection method, referring to fig. 9, including the following steps S11 to S14:
s11, sequentially connecting any two electrodes in the plurality of electrodes to two ends of a first excitation source respectively, so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop, and the first excitation source provides a first alternating current signal with a first frequency for the detection loop;
s12, acquiring a first measurement voltage signal corresponding to the detection loop;
s13, acquiring impedance of a detection loop according to the first alternating current signal and the first measurement voltage signal;
s14, acquiring the contact state of the electrode according to the impedance of the detection loop.
In this embodiment, it is achieved that any two electrodes are sequentially connected to two ends of the first excitation source respectively, so that a first measurement voltage signal corresponding to the detection loop is obtained, when in-place judgment needs to be performed on a specific electrode, impedances of the detection loop formed by the electrode and any one other electrode can be obtained respectively, a contact state of the electrode can be obtained according to the impedances of all the detection loops where the electrode is located, whether the electrode falls off or not is accurately judged, and accuracy of in-place judgment of the electrode is facilitated to be improved.
The contact state detection method of the present embodiment can be applied to the above-described bioimpedance detection circuit 100.
As an embodiment, step S14 specifically includes the steps of:
s141, if the impedance of the detection loop formed by the two electrodes meets the preset contact condition, determining that the contact states of the two electrodes are normal respectively.
In some embodiments, step S14 further comprises the steps of:
s142, if the impedance of all the detection loops where the electrodes are located does not meet the preset contact condition, determining that the contact state of the electrodes is falling.
In some embodiments, step S14 specifically includes the steps of:
s14a, if the impedance of a detection loop formed by the two electrodes is smaller than a preset resistance threshold, determining that the contact states of the two electrodes are normal respectively;
s14b, if the impedance of all detection loops where the electrodes are located is equal to a preset resistance threshold, determining that the contact state of the electrodes is falling. An embodiment of the present application provides a chip 300, referring to fig. 10, the chip 300 includes the bio-impedance detection circuit 100 described above. The Chip (Integrated Circuit, IC) is also referred to as a Chip, which may be, but is not limited to, a SOC (System on Chip) Chip, SIP (System in package ) Chip.
The chip of this embodiment, through control circuit 14 and switching network circuit 12, realized connecting arbitrary two electrodes respectively in proper order in the both ends of first excitation source, obtained the first measurement voltage signal that corresponds the detection return circuit, when needs to carry out the judgement in place to specific electrode, can obtain the impedance of the detection return circuit that this electrode and arbitrary other electrode formed respectively, can obtain the contact state of this electrode according to the impedance of all detection return circuits that this electrode is located, judge accurately whether this electrode drops, be favorable to improving the accuracy of electrode judgement in place.
The embodiment of the application further provides an electronic device 400, referring to fig. 11, where the electronic device 400 includes a device body and the chip 300 disposed in the device body. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutritional scale, a pulse oximeter, a body composition analyzer, a display, a USB (Universal Serial Bus ) docking station, an automobile, a smart wearable device, a mobile terminal, a smart home device. The intelligent wearing equipment comprises, but is not limited to, an intelligent watch, an intelligent bracelet and a cervical vertebra massage instrument. Mobile terminals include, but are not limited to, smartphones, notebook computers, tablet computers, POS (point of sales terminal, point of sale terminal) machines. The intelligent household equipment comprises, but is not limited to, an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp.
The electronic device of this embodiment, through the control circuit 14 and the switch network circuit 12, realizes that any two electrodes are connected to two ends of the first excitation source in turn, obtains the first measurement voltage signal corresponding to the detection circuit, when it is required to perform in-place judgment on a specific electrode, can obtain the impedance of the detection circuit formed by the electrode and any one other electrode respectively, and can obtain the contact state of the electrode according to the impedance of all the detection circuits where the electrode is located, so as to accurately judge whether the electrode falls off, thereby being beneficial to improving the accuracy of in-place judgment of the electrode.
The foregoing is merely exemplary of the present application and it should be noted herein that modifications may be made by those skilled in the art without departing from the inventive concept herein, which fall within the scope of the present application.
Claims (15)
1. A bioimpedance detection circuit, comprising:
the first excitation source is used for providing a first alternating current signal with a first frequency;
the switch network circuit is used for sequentially connecting any two electrodes in the plurality of electrodes to two ends of the first excitation source respectively so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop;
the first voltage measuring circuit is used for acquiring a first measuring voltage signal corresponding to the detection loop;
and the control circuit is used for acquiring the corresponding impedance of the detection loop according to the first alternating current signal and the first measurement voltage signal and acquiring the contact state of the electrode according to the impedance of the detection loop.
2. The bioimpedance detection circuit of claim 1, wherein the control circuit is further configured to:
if the impedance of the detection loop formed by the two electrodes meets the preset contact condition, determining that the contact states of the two electrodes are normal respectively.
3. The bioimpedance detection circuit of claim 2, wherein the control circuit is further configured to:
if the impedance of all the detection loops where the electrodes are positioned does not meet the preset contact condition, determining that the contact state of the electrodes is falling.
4. The bioimpedance detection circuit of claim 3, wherein the bioimpedance detection circuit further comprises:
and the resistance units are respectively connected to two ends of the first excitation source, and the resistance value of each resistance unit is a preset resistance threshold value.
5. The bioimpedance detection circuit of claim 4, wherein the impedance detection circuit comprises,
the control circuit is further configured to:
if the impedance of a detection loop formed by the two electrodes is smaller than the preset resistance threshold, determining that the contact states of the two electrodes are normal respectively;
and if the impedance of all the detection loops where the electrodes are positioned is equal to the preset resistance threshold value, determining that the contact state of the electrodes is falling.
6. The bioimpedance detection circuit according to claim 1, wherein the switching network circuit includes a plurality of switching units, the plurality of switching units being disposed in one-to-one correspondence with the plurality of electrodes, the switching units including:
a first switch for connecting the corresponding electrode to a first end of the first excitation source;
and the second switch is used for connecting the electrode to the second end of the first excitation source.
7. The bioimpedance detection circuit of claim 1, wherein the bioimpedance detection circuit further comprises:
and the first frequency selection circuit is respectively connected with the first excitation source and the first voltage measurement circuit and is used for extracting a first alternating current signal with the first frequency from a first current signal flowing through the detection loop.
8. The bioimpedance detection circuit of claim 7, wherein a plurality of said electrodes comprise at least one set of first electrode units and at least one set of second electrode units, said first electrode units comprising two first electrodes, said two first electrodes being connected to a first side and a second side of a measurement target, respectively; the second electrode unit comprises two second electrodes which are respectively connected to a first side and a second side of the measurement target;
the bioimpedance detection circuit further includes:
the two ends of the second excitation source are respectively used for connecting the two first electrodes so as to provide the second alternating current signal for the measurement target, wherein the second frequency is larger than the first frequency;
the two ends of the second voltage measuring circuit are respectively used for connecting the two second electrodes so as to acquire a second measuring voltage signal between the first side and the second side of the measuring target;
and a second frequency selection circuit connected to the second voltage measurement circuit for extracting a second alternating current signal of the second frequency from a second current signal flowing through a loop formed between the first end and the second end of the measurement target.
9. The bioimpedance detection circuit of claim 8, wherein said first frequency selection circuit comprises a low pass filter and said second frequency selection circuit comprises a high pass filter.
10. A contact state detection method, characterized in that the contact state detection method comprises:
sequentially connecting any two electrodes in a plurality of electrodes to two ends of a first excitation source respectively, so that the any two electrodes and the first excitation source sequentially form a corresponding detection loop, and the first excitation source provides a first alternating current signal with a first frequency for the detection loop;
acquiring a first measurement voltage signal corresponding to the detection loop;
acquiring the impedance of the detection loop according to the first alternating current signal and the first measurement voltage signal;
and acquiring the contact state of the electrode according to the impedance of the detection loop.
11. The contact state detection method according to claim 10, wherein the acquiring the contact state of the electrode from the impedance of the detection circuit includes:
if the impedance of the detection loop formed by the two electrodes meets a preset contact condition, determining that the contact states of the two electrodes are normal respectively.
12. The contact state detection method according to claim 11, wherein the acquiring the contact state of the electrode from the impedance of the detection circuit includes:
if the impedance of all the detection loops where the electrodes are positioned does not meet the preset contact condition, determining that the contact state of the electrodes is falling.
13. The contact state detection method according to claim 12, wherein the acquiring the contact state of the electrode from the impedance of the detection circuit includes:
if the impedance of a detection loop formed by the two electrodes is smaller than the preset resistance threshold, determining that the contact states of the two electrodes are normal respectively;
and if the impedance of all the detection loops where the electrodes are positioned is equal to the preset resistance threshold value, determining that the contact state of the electrodes is falling.
14. A chip comprising the bioimpedance detection circuit of any one of claims 1 to 9.
15. An electronic device comprising the chip of claim 14.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311455953.2A CN117562527A (en) | 2023-11-02 | 2023-11-02 | Bioimpedance detection circuit, contact state detection method, chip and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311455953.2A CN117562527A (en) | 2023-11-02 | 2023-11-02 | Bioimpedance detection circuit, contact state detection method, chip and electronic equipment |
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| CN117562527A true CN117562527A (en) | 2024-02-20 |
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| CN (1) | CN117562527A (en) |
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- 2023-11-02 CN CN202311455953.2A patent/CN117562527A/en active Pending
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