Human body impedance detection circuit, method and equipment and storage medium

Abstract

The invention relates to the technical field of human body embedded equipment detection, in particular to a human body impedance detection circuit, method and equipment and a storage medium, and aims to solve the problem of low human body impedance detection precision. The human body impedance detection circuit comprises a power conversion module, a current control module, a main control chip and an impedance detection module, the power supply conversion module realizes static detection of to-be-detected impedance; the current control module is used as a constant current source to realize dynamic detection of to-be-detected impedance; the output end of the impedance detection module is connected to the first input end of the main control chip, and the impedance detection module is used for obtaining an equivalent current between the two current signals according to the two current signals output by the current control module and obtaining a detection value of the to-be-detected impedance through voltages at the two ends of the to-be-detected impedance; a static detection and dynamic detection combined mode is adopted to detect the resistance value of the to-be-detected impedance, and the purpose of improving the detection precision is achieved. Therefore, the technical effects of detecting the impedance to be detected and improving the detection precision can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of human body embedded device detection, and in particular to a human body impedance detection circuit, method, device and storage medium. Background Art

[0002] With the continuous advancement of medical technology, the purpose of treating or detecting diseases is achieved by embedding some tiny detection devices or auxiliary devices into the human body, such as pacemakers, minimally invasive needles or simulators. By embedding simulation devices, human life behaviors can be simulated, or the purpose of alleviating pain caused by diseases can be achieved.

[0003] For devices embedded in the human body, due to the instability caused by human movement, the human body impedance detection method is generally used to determine whether the device is operating normally in the human body. However, due to the uncertain factors during human movement, it is difficult to dynamically detect human body impedance. For example, when the human body moves, the contact surface of the device in the body changes, causing the test results to change, reducing the accuracy of disease treatment.

[0004] Therefore, how to improve the accuracy and precision of human body impedance detection has become a problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a human body impedance detection circuit, method, device and storage medium to solve the problem of low accuracy of human body impedance detection.

[0006] In a first aspect, an embodiment of the present application provides a human body impedance detection circuit, comprising:

[0007] Power conversion module, current control module, main control chip and impedance detection module;

[0008] The output end of the power conversion module is connected to the first input end of the current control module, and the power conversion module is used to provide a working voltage for the current control module;

[0009] The second input end of the current control module is connected to the first output end of the main control chip, the third input end of the current control module is connected to the second output end of the main control chip, the first output end of the current control module is connected to the first input end of the impedance detection module and one end of the impedance to be measured, the second output end of the current control module is connected to the second input end of the impedance detection module and the other end of the impedance to be measured, and the current control module is used to provide a stable current signal for the impedance detection module through the control of the main control chip;

[0010] The output end of the impedance detection module is connected to the first input end of the main control chip. The impedance detection module is used to obtain the equivalent current between the two current signals according to the two current signals output by the current control module, and to obtain the detection value of the impedance to be measured through the voltage across the two ends of the impedance to be measured.

[0011] In combination with the first aspect, in some implementations of the first aspect, the main control chip is used to transmit a sinusoidal current signal to the current control module, and transmit a stable current signal to the impedance detection module through the current control module, and the impedance detection module is further used to analyze the detection value of the impedance to be measured according to the current signal, and feed back the detection value of the impedance to be measured to the main control chip;

[0012] The main control chip is also used to change the input electrical signal of the power conversion module so that the output of the power conversion module adjusts the voltage signal. The main control chip is also used to change the input electrical signal of the current control module so that the current control module outputs an adjusted current signal. The adjusted voltage signal and the adjusted current signal are input into the impedance detection module, and the adjusted detection value of the impedance to be measured is detected by the impedance detection module.

[0013] In combination with the first aspect, in some implementations of the first aspect, the power conversion module includes: a power battery, a first inductor, a first transistor, a first diode, and a first capacitor;

[0014] The positive output terminal of the power battery is connected to one end of the first inductor, the negative input terminal of the power battery and the first end of the first transistor and one end of the first capacitor are connected to the first ground terminal, and the power battery provides a start-up voltage for the main control chip and the current control module;

[0015] The other end of the first inductor is connected to the second end of the first transistor and the reverse input end of the first diode;

[0016] The forward output end of the first diode and the other end of the first capacitor are connected to the first input end of the current control module as the output end of the power conversion module;

[0017] The control end of the first transistor is connected to the third output end of the main control chip.

[0018] In combination with the first aspect, in some implementations of the first aspect, the current control module includes:

[0019] A first op amp, a second op amp, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a second capacitor, a third capacitor, a first impedance, and a second impedance;

[0020] The positive input end of the first op amp is connected to the first output end of the main control chip as the second input end of the current control module, the negative input end of the first op amp is connected to one end of the first impedance and the second end of the first switch tube, and the output end of the first op amp is connected to the control end of the first switch tube;

[0021] The first end of the first switch tube is connected to the first end of the second switch tube, the control end of the second switch tube and the control end of the third switch tube;

[0022] The other end of the first impedance is connected to a second ground terminal;

[0023] The second end of the second switch tube is connected as the first input end of the current control module and is connected to the output end of the power conversion module with the second end of the third switch tube, the second end of the fourth switch tube, and the second end of the fifth switch tube;

[0024] The first end of the third switch tube is connected to the first end of the sixth switch tube and one end of the second capacitor;

[0025] The second end of the sixth switch tube is connected to the third ground end, and the control end of the sixth switch tube is connected to the fourth output end of the main control chip;

[0026] The first end of the fourth switch tube is connected to the first end of the seventh switch tube and one end of the third capacitor, and the control end of the fourth switch tube is connected to the control end of the fifth switch tube, the first end of the fifth switch tube and the first end of the eighth switch tube;

[0027] The second end of the seventh switch tube is connected to the fourth ground end, and the control end of the seventh switch tube is connected to the fifth output end of the main control chip;

[0028] The second end of the eighth switch tube is connected to one end of the second impedance and the inverting input end of the second operational amplifier, and the control end of the eighth switch tube is connected to the output end of the second operational amplifier;

[0029] The positive input terminal of the second operational amplifier is connected to the second output terminal of the main control chip as the third input terminal of the current control module;

[0030] The other end of the second impedance is connected to a fifth ground terminal;

[0031] The other end of the second capacitor is connected to the first input end of the impedance detection module and one end of the impedance to be measured as the first output end of the current control module;

[0032] The other end of the third capacitor serves as the second output end of the current control module and is connected to the second input end of the impedance detection module and the other end of the impedance to be measured.

[0033] In combination with the first aspect, in some implementations of the first aspect, the current control module includes:

[0034] a third operational amplifier, a fourth operational amplifier, a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube, a sixteenth switch tube, a seventeenth switch tube, a third impedance, a fourth impedance, a fifth impedance, a sixth impedance, a seventh impedance, an eighth impedance, a fourth capacitor, and a fifth capacitor;

[0035] The positive input end of the third op amp is connected to the first output end of the main control chip as the second input end of the current control module, the negative input end of the third op amp is connected to the second end of the ninth switch tube and one end of the third impedance, and the output end of the third op amp is connected to the control end of the ninth switch tube;

[0036] The first end of the ninth switch tube is connected to the first end of the tenth switch tube, the control end of the tenth switch tube and the control end of the eleventh switch tube;

[0037] The other end of the third impedance is connected to a sixth ground terminal;

[0038] The second end of the tenth switch tube is connected to the second end of the eleventh switch tube, the second end of the twelfth switch tube, the second end of the thirteenth switch tube, the second end of the fourteenth switch tube and one end of the fourth impedance;

[0039] The first end of the eleventh switch tube and the first end of the fourteenth switch tube are connected to the first input end of the impedance detection module as the first output end of the current control module;

[0040] The control end of the twelfth switch tube is connected to the other end of the fourth impedance and one end of the fifth impedance, and the first end of the twelfth switch tube and the first end of the fifteenth switch tube are connected to the second input end of the impedance detection module as the second output end of the current control module;

[0041] The other end of the fifth impedance is connected to the first end of the sixteenth switch tube;

[0042] The first end of the thirteenth switch tube is connected to the control end of the thirteenth switch tube, the control end of the fourteenth switch tube and the first end of the seventeenth switch tube;

[0043] The control end of the fifteenth switch tube is connected to one end of the sixth impedance and one end of the fourth capacitor, and the second end of the fifteenth switch tube and the other end of the fourth capacitor are connected to the seventh ground end;

[0044] The other end of the sixth impedance is connected to the first output end of the main control chip;

[0045] The control end of the sixteenth switch tube is connected to one end of the seventh impedance and one end of the fifth capacitor, and the second end of the sixteenth switch tube and the other end of the fifth capacitor are connected to the eighth ground end;

[0046] The other end of the seventh impedance is connected to the second output end of the main control chip;

[0047] The control end of the seventeenth switch tube is connected to the output end of the fourth operational amplifier, and the second end of the seventeenth switch tube is connected to one end of the eighth impedance and the reverse input end of the fourth operational amplifier;

[0048] The other end of the eighth impedance is connected to a ninth ground terminal;

[0049] The positive input terminal of the fourth operational amplifier is connected to the second output terminal of the main control chip.

[0050] In combination with the first aspect, in some implementations of the first aspect, the impedance detection module includes:

[0051] Protection unit and impedance detection unit;

[0052] The first input end of the protection unit is connected to the first output end of the current control module as the first input end of the impedance detection module, the second input end of the protection unit is connected to the second output end of the current control module as the second input end of the impedance detection module, the first output end of the protection unit is connected to the first input end of the impedance detection unit, the second output end of the protection unit is connected to the second input end of the impedance detection unit, and the protection unit is used to block the current from being input to the impedance detection unit when the input current is too large;

[0053] The output end of the impedance detection unit is connected to the first input end of the main control chip as the output end of the impedance detection module, and the impedance detection unit is used to detect the detection value of the impedance to be measured.

[0054] In combination with the first aspect, in some implementations of the first aspect, the protection unit includes: a first relay switch;

[0055] The first input end of the first relay switch is connected to the first output end of the current control module as the first input end of the protection unit, the second input end of the first relay switch is connected to the second output end of the current control module as the second input end of the protection unit, the first output end of the first relay switch is connected to the first input end of the impedance detection unit as the first output end of the protection unit, the second output end of the first relay switch is connected to the second input end of the impedance detection unit as the second output end of the protection unit, and the first relay switch is used to block the high current from flowing to the impedance detection unit when receiving an excessively high current.

[0056] In combination with the first aspect, in some implementations of the first aspect, the impedance detection unit includes: a ninth impedance, a tenth impedance, an eleventh impedance, a twelfth impedance, a thirteenth impedance, a sixth capacitor, and a fifth operational amplifier;

[0057] One end of the ninth impedance is connected as the first input end of the impedance detection unit, and the other end of the ninth impedance is connected to one end of the tenth impedance and the positive input end of the fifth operational amplifier;

[0058] The other end of the tenth impedance is connected to a tenth ground terminal;

[0059] One end of the eleventh impedance is connected to the second output end of the protection unit as the second input end of the impedance detection unit, and the other end of the eleventh impedance is connected to one end of the twelfth impedance and the reverse input end of the fifth operational amplifier;

[0060] The other end of the twelfth impedance is connected to the output end of the fifth operational amplifier and one end of the thirteenth impedance;

[0061] The other end of the thirteenth impedance and one end of the sixth capacitor are connected to the first input end of the main control chip as the output end of the impedance detection unit;

[0062] The other end of the sixth capacitor is connected to an eleventh ground terminal.

[0063] In combination with the first aspect, in some implementations of the first aspect, the circuit further includes: an electrode selection module and a fine-tuning module;

[0064] The electrode selection module and the fine-tuning module are connected between the current control module and the impedance detection module, the first input end of the electrode selection module is connected to the first output end of the current control module, the second input end of the electrode selection module is connected to the second output end of the current control module, the first output end of the electrode selection module is connected to the first input end of the fine-tuning module and one end of the impedance to be measured, the second output end of the electrode selection module is connected to the second input end of the fine-tuning module and the other end of the impedance to be measured, the electrode selection module is used to select electrodes at different positions in the human body and change the detection value of the impedance to be measured, and the fine-tuning module is used to change the branch current of the impedance to be measured connected in parallel so that the impedance detection module operates in a working current environment.

[0065] In combination with the first aspect, in some implementations of the first aspect, the electrode selection module includes: a switch selection chip, a first electrode rod and a second electrode rod, the fine-tuning module includes a plurality of fine-tuning branches connected in parallel, and the fine-tuning branches are composed of impedances and switches connected in series;

[0066] The first input end of the switch selection chip is connected to the first output end of the current control module, the second input end of the switch selection chip is connected to the second output end of the current control module, the third input end of the switch selection chip is connected to the fourth output end of the main control chip, the switch selection chip is used to receive the switch control signal output by the main control chip, the first output end of the switch selection chip is connected to the first contact in the first electrode rod and the second electrode rod, the second output end of the switch selection chip is connected to the second contact in the first electrode rod and the second electrode rod, the third output end of the switch selection chip is connected to the second input end of the main control chip, and the switch selection chip is also used to feedback the switch state to the main control chip;

[0067] The first contact points in the first electrode rod and the second electrode rod, the first input end of the fine-tuning module and one end of the impedance to be measured are connected to the first input end of the impedance detection module;

[0068] The second contacts in the first electrode rod and the second electrode rod, the second input end of the fine-tuning module and the other end of the impedance to be measured are connected to the second input end of the impedance detection module.

[0069] In a second aspect, an embodiment of the present application provides a human body impedance detection method, which is applied to any human body impedance detection circuit as described in the first aspect, including:

[0070] Obtaining the initial impedance value of the impedance to be measured;

[0071] Adjusting the working current of the current control module to obtain a corresponding adjustment impedance value;

[0072] Based on the initial impedance value and the adjusted impedance value, a target detection value of the impedance to be measured is determined.

[0073] In conjunction with the second aspect, in some implementations of the second aspect, obtaining the initial impedance value of the impedance to be measured includes:

[0074] Controlling the first transistor to remain in an off state, and determining an initial supply voltage value corresponding to the voltage conversion module;

[0075] Determining an initial current value output by the current control module based on the initial supply voltage value;

[0076] An initial impedance value of the impedance to be measured is determined based on the initial current value and the initial supply voltage value.

[0077] In combination with the second aspect, in some implementations of the second aspect, the step of adjusting the working current of the current control module to obtain a corresponding adjustment impedance value includes:

[0078] The main control chip controls the first transistor to remain in a closed state, thereby determining the regulated voltage value output by the voltage conversion module;

[0079] Adjusting the input signal of the current control module to obtain an adjusted working current output by the current control module;

[0080] An adjusted impedance value corresponding to the impedance detection unit is obtained based on the adjusted voltage value and the working current.

[0081] In combination with the second aspect, in some implementations of the second aspect, determining the target detection value of the impedance to be measured based on the initial impedance value and the adjusted impedance value includes:

[0082] Obtaining a difference between the adjusted impedance value and the initial impedance value;

[0083] When the difference meets a preset threshold condition, the currently adjusted impedance value is used as the target detection value of the impedance to be measured.

[0084] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0085] When the operating current of the current control module exceeds the set current threshold, the protection unit is controlled to remain disconnected, or the conduction state of the fine-tuning module is adjusted to start the overcurrent protection of the impedance detection unit.

[0086] In a third aspect, an embodiment of the present application provides a detection device, comprising: a processor and a memory, wherein the processor is used to execute a control program for human body impedance detection stored in the memory to implement the human body impedance detection method described in any one of the second aspects.

[0087] In a fourth aspect, an embodiment of the present application provides a storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the human body impedance detection method described in any one of the second aspects.

[0088] The human body impedance detection circuit provided by the embodiment of the present application is provided with a power conversion module, a current control module, a main control chip and an impedance detection module; the output end of the power conversion module is connected to the first input end of the current control module, and the power conversion module is used to provide a working voltage for the current control module; the second input end of the current control module is connected to the first output end of the main control chip, the third input end of the current control module is connected to the second output end of the main control chip, the first output end of the current control module is connected to the first input end of the impedance detection module and one end of the impedance to be measured, and the second output end of the current control module is connected to the second input end of the impedance detection module and the other end of the impedance to be measured The current control module is used to provide a stable current signal to the impedance detection module through the control of the main control chip; the output end of the impedance detection module is connected to the first input end of the main control chip, and the impedance detection module is used to obtain the equivalent current between the two current signals according to the two current signals output by the current control module, and obtain the detection value of the impedance to be measured through the voltage across the impedance to be measured; by adjusting the square wave signal in the current control module, the current size is changed to obtain multiple impedance values, which are compared with the previously detected impedance values, and the purpose of dynamically detecting human body impedance is achieved through fine-tuning, and the detection accuracy is improved after multiple detections; thereby, the technical effect of improving the accuracy of human body impedance detection can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0090] Figure 1 The figure is a schematic diagram of the structure of a human body impedance detection circuit provided in the first embodiment of the present application;

[0091] Figure 2The figure shows a schematic diagram of the structure of a human body impedance detection circuit provided in the second embodiment of the present application;

[0092] Figure 3 FIG. 2 is a schematic diagram showing the structure of another human body impedance detection circuit provided in Embodiment 2 of the present application;

[0093] Figure 4 FIG. 1 is a schematic diagram of a human body impedance detection circuit provided in Embodiment 3 of the present application;

[0094] Figure 5 FIG. 2 is a schematic diagram showing the structure of another human body impedance detection circuit provided in Embodiment 3 of the present application;

[0095] Figure 6 FIG. 4 is a flow chart of a method for detecting human body impedance according to a fourth embodiment of the present application;

[0096] Figure 7 FIG. 4 is a flow chart of another method for detecting human body impedance provided in Embodiment 4 of the present application;

[0097] Figure 8 Shown is a schematic diagram of the structure of a detection device provided in Example 5 of the present application.

[0098] Reference numerals:

[0099] 10. Power conversion module; 20. Current control module; 30. Impedance detection module; 40. Pole selection module; 50. Fine-tuning module; By, power battery; L1, first inductor; Q1, first transistor; D1, first diode; C1, first capacitor; Rb, impedance to be measured; MCU, main control chip; U1A, first op amp; U1B, second op amp; T1, first switch tube; T2, second switch tube; T3, third switch tube; T4, fourth switch tube; T5, fifth switch tube; T6, sixth switch tube; T7, seventh switch tube; T8, eighth switch tube; C2, second capacitor; C3, third capacitor; R1, first impedance; R2, second impedance; U2A, third op amp; U2B, fourth op amp; T9, ninth switch tube; T10, tenth switch tube; T1 1. The eleventh switch tube; T12, the twelfth switch tube; T13, the thirteenth switch tube; T14, the fourteenth switch tube; T15, the fifteenth switch tube; T16, the sixteenth switch tube; T17, the seventeenth switch tube; R3, the third impedance; R4, the fourth impedance; R5, the fifth impedance; R6, the sixth impedance; R7, the seventh impedance; R8, the eighth impedance; C4, the fourth capacitor; C5, the fifth capacitor; 31. The protection unit; 32. The impedance detection unit; S1, the first relay switch; R9, the ninth impedance; R10, the tenth impedance; R11, the eleventh impedance; R12, the twelfth impedance; R13, the thirteenth impedance; C6, the sixth capacitor; U3A, the fifth operational amplifier; 41. The switch selection chip; 42. The first electrode rod; 43. The second electrode rod; R, impedance; K, switch. DETAILED DESCRIPTION

[0100] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0101] With the development of technology, there are many ways to detect human body impedance. All of them are to further clarify whether the treatment device or detection device is working normally in the human body, and provide more accurate information for the next step of disease treatment and detection. However, in the device embedded in the human body, the voltage or current at a specified position of the human body is collected in the form of an electrode rod, and the human body impedance at the detection position is calculated by detecting the equivalent voltage between the two electrodes. As the human body moves, the contact point of the electrode rod in the body changes, which may affect the detection results of the human body impedance.

[0102] In order to solve the inaccuracy of human body impedance detection results caused by the change of the position of the electrode rod embedded in the body, the present application proposes a human body impedance detection circuit, which obtains the initial impedance value in the detection circuit by setting a power conversion module, and realizes dynamic detection by setting a current control module and adjusting the square wave signal in the current control module to obtain multiple groups of human body impedance values. By setting a main control chip and an impedance detection module, the main control chip analyzes the size of the detection value, and selects the closest human body impedance value, so as to achieve the purpose of improving the accuracy of human body impedance detection. The human body impedance detection circuit is described in detail below in conjunction with the accompanying drawings.

[0103] Embodiment 1

[0104] Figure 1 FIG. 1 is a schematic diagram of a human body impedance detection circuit provided in Example 1 of the present application. Figure 1 As shown, the structure of the human body impedance detection circuit specifically includes:

[0105] A power conversion module 10 , a current control module 20 , a main control chip MCU and an impedance detection module 30 .

[0106] The output terminal of the power conversion module 10 is connected to the first input terminal of the current control module 20 . The power conversion module 10 is used to provide the operating voltage Vcc for the current control module 20 .

[0107] The second input end of the current control module 20 is connected to the first output end of the main control chip MCU, the third input end of the current control module 20 is connected to the second output end of the main control chip MCU, the first output end of the current control module 20 is connected to the first input end of the impedance detection module 30 and one end of the impedance to be measured Rb, the second output end of the current control module 20 is connected to the second input end of the impedance detection module 30 and the other end of the impedance to be measured Rb, and the current control module 20 is used to provide a stable current signal to the impedance detection module 30 through the control of the main control chip MCU.

[0108] The output end of the impedance detection module 30 is connected to the first input end of the main control chip MCU. The impedance detection module 30 is used to obtain the equivalent current between the two current signals according to the two current signals output by the current control module 20, and to obtain the detection value of the impedance to be measured Rb through the voltage across the two ends of the impedance to be measured Rb.

[0109] Exemplarily, the main control chip MCU is used to transmit a sinusoidal current signal to the current control module 20, and transmit a stable current signal to the impedance detection module 30 through the current control module 20. The impedance detection module 30 is also used to analyze the detection value of the impedance to be measured Rb according to the current signal, and feed back the detection value of the impedance to be measured Rb to the main control chip MCU.

[0110] The main control chip MCU is also used to change the input electrical signal of the power conversion module 10 so that the output of the power conversion module 10 adjusts the voltage signal. The main control chip MCU is also used to change the input electrical signal of the current control module 20 so that the current control module 20 outputs an adjusted current signal. The adjusted voltage signal and the adjusted current signal are input to the impedance detection module 30, and the adjusted detection value of the impedance to be measured Rb is detected by the impedance detection module 30.

[0111] Exemplarily, the power conversion module 10 converts the AC power into the working voltage of the detection circuit and then provides the working voltage to the current control module 20; the current control module 20 is used as a constant current source to generate a current signal according to the square wave signal output by the main control chip MCU, and the impedance detection module 30 feeds back the voltage and current signals to the main control chip MCU for calculating the detection value of the impedance Rb to be measured based on the voltage across the impedance to be measured and the generated current signal; by comparing with the impedance value detected last time, a more accurate detection value is selected, and the main control chip MCU specifically increases or decreases the output square wave signal strength according to the detection result, and changes the size of the current signal generated by the current control module 20, thereby obtaining different detection values, and the main control chip MCU compares the detection values ​​corresponding to the impedance to be measured, and repeatedly selects detection values ​​with higher accuracy.

[0112] The present application provides a human body impedance detection circuit, which provides a working voltage for the detection circuit through a power conversion module, and changes the frequency or amplitude of a square wave signal through a main control chip, so that the current signal of a current control module is changed, thereby affecting the detection result of the impedance detection module, and obtaining multiple detection values ​​of the impedance to be measured. Through directional selection, a detection value closer to the accurate value is obtained, thereby improving the detection accuracy of the human body impedance.

[0113] Embodiment 2

[0114] Figure 2 Shown is a structural schematic diagram of a human body impedance detection circuit provided in Example 2 of the present application.

[0115] Figure 3 Shown is a structural schematic diagram of another human body impedance detection circuit provided in Example 2 of the present application. Figure 2 and Figure 3 This is introduced based on the previous embodiment. Figure 2 and Figure 3 The structure of the human body impedance detection circuit specifically includes:

[0116] A power conversion module 10 , a current control module 20 , a main control chip MCU and an impedance detection module 30 .

[0117] For example, according to Figure 2and Figure 3 According to the diagram provided, the power conversion module 10 in the human body impedance detection circuit includes:

[0118] A power supply battery By, a first inductor L1, a first transistor Q1, a first diode D1 and a first capacitor C1.

[0119] The positive output terminal of the power battery By is connected to one end of the first inductor L1, the negative input terminal of the power battery By and the first end of the first transistor Q1 and one end of the first capacitor C1 are connected to the first ground terminal, and the power battery By provides a start-up voltage Vcc for the main control chip MCU and the current control module 20.

[0120] The other end of the first inductor L1 is connected to the second end of the first transistor Q1 and the inverting input end of the first diode D1.

[0121] The forward output terminal of the first diode D1 and the other end of the first capacitor C1 as the output terminal of the power conversion module 10 are connected to the first input terminal of the current control module 20 .

[0122] The control end of the first transistor Q1 is connected to the third output end of the main control chip MCU.

[0123] Exemplarily, the first transistor Q1 can be understood as a MOS tube, an IGBT or a triode having a switch function, etc. The embodiment of the present application uses a MOS tube as the first transistor for illustration.

[0124] In a possible example scenario, the power is supplied by the power battery By, and the main control chip MCU is first used to control the first transistor Q1 to be disconnected. At this time, the power battery By stores energy through the loop formed by the first inductor and the first capacitor, and outputs the power supply voltage Vcc to the current control module connected to the subsequent stage. At the same time, the main control chip MCU changes the square wave signal output, and changes the conduction time of the first transistor while closing the first transistor, thereby achieving the purpose of changing the output voltage, thereby achieving the purpose of adjusting the power supply voltage Vcc.

[0125] Exemplarily, the first transistor Q1 is turned off to obtain a static power supply voltage value, which is used as an initial reference value for adjusting the voltage value.

[0126] For example, according to Figure 2 According to the diagram provided, the current control module 20 in the human body impedance detection circuit includes:

[0127] A first operational amplifier U1A, a second operational amplifier U1B, a first switch tube T1, a second switch tube T2, a third switch tube T3, a fourth switch tube T4, a fifth switch tube T5, a sixth switch tube T6, a seventh switch tube T7, an eighth switch tube T8, a second capacitor C2, a third capacitor C3, a first impedance R1 and a second impedance R2.

[0128] The positive input terminal of the first op amp U1A is connected to the first output terminal of the main control chip MCU as the second input terminal of the current control module 20, the reverse input terminal of the first op amp U1A is connected to one end of the first impedance R1 and the second end of the first switch tube T1, and the output terminal of the first op amp U1A is connected to the control terminal of the first switch tube T1.

[0129] The first end of the first switch tube T1 is connected to the first end of the second switch tube T2 , the control end of the second switch tube T2 , and the control end of the third switch tube T3 .

[0130] The other end of the first impedance R1 is connected to the second ground end.

[0131] The second end of the second switch tube T2 is connected as the first input end of the current control module 20 and is connected to the output end of the power conversion module 20 with the second ends of the third switch tube T3 , the fourth switch tube T4 , and the fifth switch tube T5 .

[0132] A first end of the third switch tube T3 is connected to a first end of the sixth switch tube T6 and one end of the second capacitor C2.

[0133] The second end of the sixth switch tube T6 is connected to the third ground end, and the control end of the sixth switch tube T6 is connected to the fourth output end of the main control chip MCU.

[0134] The first end of the fourth switch tube T4 is connected to the first end of the seventh switch tube T7 and one end of the third capacitor C3, and the control end of the fourth switch tube T4 is connected to the control end of the fifth switch tube T5, the first end of the fifth switch tube T5 and the first end of the eighth switch tube T8.

[0135] The second end of the seventh switch tube T7 is connected to the fourth ground end, and the control end of the seventh switch tube T7 is connected to the fifth output end of the main control chip MCU.

[0136] The second end of the eighth switch tube Y8 is connected to one end of the second impedance R2 and the inverting input end of the second amplifier U1B, and the control end of the eighth switch tube T8 is connected to the output end of the second amplifier U1B.

[0137] The positive input terminal of the second operational amplifier U1B is connected to the second output terminal of the main control chip MCU as the third input terminal of the current control module 20 .

[0138] The other end of the second impedance R2 is connected to the fifth ground end.

[0139] The other end of the second capacitor C2 is connected to the first input end of the impedance detection module 30 and one end of the impedance to be measured Rb as the first output end of the current control module 20 .

[0140] The other end of the third capacitor C3 is connected to the second input end of the impedance detection module 30 and the other end of the impedance to be measured Rb as the second output end of the current control module 20 .

[0141] Exemplarily, the purpose of the switch tube is to turn on or off, and in this solution, the switch tube is a triode. Optionally, a MOS tube (including a PMOS tube and / or an NMOS tube), an IGBT or other transistor with a switching function can also be used.

[0142] Exemplarily, a square wave signal is provided to the current control module through a PWM interface in the main control chip.

[0143] In a possible example scenario, the power conversion module 10 provides electric energy Vcc to the current control module 20, and after the set DAC AC / DC signal is input to the first op amp U1A and the second op amp U1B in the current control module through the main control chip MCU, the first op amp or the second op amp U1B is controlled to output a high-level signal when the DAC signal is high, and to output a low-level signal when the DAC signal is low. After the first op amp U1A outputs a high level, the second switch tube T2 and the third switch tube T3 are controlled to be turned on under the action of the power supply Vcc, and a charging circuit is formed with the second capacitor C2, the impedance to be measured Rb, the third capacitor C3 and the fifth switch tube T5; when the second op amp U1B outputs a high-level signal, the fourth switch tube T4 and the fifth switch tube T5 are turned on under the action of the power supply Vcc, and a power supply circuit is formed through the third capacitor T3, the impedance to be measured Rb, the second capacitor C2 and the sixth switch tube T6; and then a constant current source is formed through the current control module, and a stable current is provided to the impedance to be measured Rb through an equivalent constant current source.

[0144] Further, when the power supply Vcc needs to be adjusted, by changing the square wave signal output by the main control chip MCU, the internal switch conduction time of the power conversion module 10 is controlled to achieve the purpose of changing the output power supply. At the same time, by changing the square wave signal output by the main control chip MCU to the first op amp U1A and the second op amp U1B, the output signal of the first op amp U1A or the second op amp U1B is changed, and then the switch state of the first switch tube T1 or the eighth switch tube T8 is changed, and the current size of the equivalent constant current source is changed to achieve the purpose of adjusting the current. By changing the current size of the constant current source, the voltage at both ends of the impedance to be measured Rb is changed. After the voltage and current of the impedance to be measured Rb are detected by the impedance detection module 30 and fed back to the main control chip MCU, a detection value of the impedance to be measured Rb is calculated by the main control chip MCU. Compared with the detection value detected last time, a detection value closer to the true value is selected for the next detection comparison, thereby improving the accuracy of the detection result.

[0145] For example, according to Figure 3According to the diagram provided, the current control module 20 in the human body impedance detection circuit includes:

[0146] The third operational amplifier U2A, the fourth operational amplifier U2B, the ninth switch tube T9, the tenth switch tube T10, the eleventh switch tube T11, the twelfth switch tube T12, the thirteenth switch tube T13, the fourteenth switch tube T14, the fifteenth switch tube T15, the sixteenth switch tube T16, the seventeenth switch tube T17, the third impedance R3, the fourth impedance R4, the fifth impedance R5, the sixth impedance R6, the seventh impedance R7, the eighth impedance R8, the fourth capacitor C4 and the fifth capacitor C5.

[0147] The positive input terminal of the third op amp U2A is connected to the first output terminal of the main control chip MCU as the second input terminal of the current control module 20, the reverse input terminal of the third op amp U2A is connected to the second terminal of the ninth switch tube T9 and one end of the third impedance R3, and the output terminal of the third op amp U2A is connected to the control terminal of the ninth switch tube T9.

[0148] A first end of the ninth switch tube T9 is connected to a first end of the tenth switch tube T10 , a control end of the tenth switch tube T10 , and a control end of the eleventh switch tube T11 .

[0149] The other end of the third impedance R3 is connected to the sixth ground end.

[0150] A second end of the tenth switch tube T10 is connected to second ends of the eleventh switch tube T11 , the twelfth switch tube T12 , the thirteenth switch tube T13 , the fourteenth switch tube T14 and one end of the fourth resistor R4 .

[0151] The first end of the eleventh switch tube T11 and the first end of the fourteenth switch tube T14 are connected to the first input end of the impedance detection module 30 as the first output end of the current control module 20 .

[0152] The control end of the twelfth switch tube T12 is connected to the other end of the fourth impedance R4 and one end of the fifth impedance R5, and the first end of the twelfth switch tube T12 and the first end of the fifteenth switch tube T15 are connected to the second input end of the impedance detection module 30 as the second output end of the current control module 20.

[0153] The other end of the fifth resistor R5 is connected to the first end of the sixteenth switch tube T16.

[0154] A first end of the thirteenth switch tube T13 is connected to a control end of the thirteenth switch tube T13 , a control end of the fourteenth switch tube T14 , and a first end of the seventeenth switch tube T17 .

[0155] The control end of the fifteenth switch tube T15 is connected to one end of the sixth impedance R6 and one end of the fourth capacitor C4, and the second end of the fifteenth switch tube T15 and the other end of the fourth capacitor C4 are connected to the seventh ground end.

[0156] The other end of the sixth impedance R6 is connected to the first output end of the main control chip MCU.

[0157] The control end of the sixteenth switch tube T16 is connected to one end of the seventh impedance R7 and one end of the fifth capacitor C5 , and the second end of the sixteenth switch tube T16 and the other end of the fifth capacitor C5 are connected to the eighth ground end.

[0158] The other end of the seventh impedance R7 is connected to the second output end of the main control chip MCU.

[0159] The control end of the seventeenth switch tube T17 is connected to the output end of the fourth operational amplifier U2B, and the second end of the seventeenth switch tube T17 is connected to one end of the eighth impedance R8 and the reverse input end of the fourth operational amplifier U2B.

[0160] The other end of the eighth impedance R8 is connected to the ninth ground end.

[0161] The positive input terminal of the fourth operational amplifier U2B is connected to the second output terminal of the main control chip MCU.

[0162] In one possible example scenario, the structure of the current control module can be like Figure 2 In addition to the structure shown in Figure 3 The structure in the figure is set to achieve the same constant current source function. Similarly, Figure 2 Compared with the internal structure of the current control module in Figure 3 The internal structure of the current control module provided is also to provide a stable current for the impedance to be measured.

[0163] The impedance mentioned here refers to the resistance device. The switch tube mentioned here refers to the device with the function of switching, such as MOS tube, triode, ICBT, etc.

[0164] For example, according to Figure 3The diagram provided shows that after the power conversion module provides the power supply Vcc, a square wave signal is input to the third op amp U2A and the fourth op amp U2B through the main control chip MCU to control the conduction state of the ninth switch tube T9 and the seventeenth switch tube T17, thereby forming a new loop, which is equivalent to a new constant current source, and the main control chip MCU alternately outputs an AC square wave signal to realize an AC signal, and provides an AC current for the impedance to be measured Rb. Then, by adjusting the size of the square wave signal input to the seventh impedance R7 and the sixth impedance R6, the conduction state of the adjustment loop is achieved, and the size of the square wave input to the third op amp U2A and the fourth op amp U2B is controlled to adjust the size of the current, and multiple groups of different current data and voltage values ​​corresponding to the impedance to be measured are obtained through the impedance detection module 30, and then the detection value of the impedance to be measured Rb is calculated.

[0165] Similarly, using Figure 3 The structure in the current control module provides a constant current signal for the impedance to be measured, and changes the size of the constant current source by changing the square wave size of the signal output by the main control chip to the third op amp and the fourth op amp, so as to change the voltage detection value of the impedance to be measured, and calculate the estimated value of the impedance to be measured through the voltage detection value and the current value. By comparing multiple groups of estimated values ​​with previously detected data, a detection value closer to the true value is obtained, thereby improving the detection accuracy.

[0166] For example, according to Figure 2 and Figure 3 According to the diagram provided, the impedance detection module 30 in the human body impedance detection circuit includes:

[0167] The protection unit 31 and the impedance detection unit 32 .

[0168] The first input end of the protection unit 31 is connected to the first output end of the current control module 20 as the first input end of the impedance detection module 30, the second input end of the protection unit 31 is connected to the second output end of the current control module 20 as the second input end of the impedance detection module 30, the first output end of the protection unit 31 is connected to the first input end of the impedance detection unit 32, the second output end of the protection unit 31 is connected to the second input end of the impedance detection unit 32, and the protection unit 31 is used to block the current from being input to the impedance detection unit 32 when the input current is too large.

[0169] The output end of the impedance detection unit 32 is connected to the first input end of the main control chip MCU as the output end of the impedance detection module 30 . The impedance detection unit 32 is used to detect the detection value of the impedance to be measured Rb.

[0170] Exemplarily, the protection unit 31 is used for switch control. When the current output by the current control module is too high, in order to prevent the internal components of the impedance detection unit 32 from being damaged, the protection unit 31 is disconnected internally to block the excessive current from flowing to the impedance detection unit 32 .

[0171] Furthermore, after the current control module outputs a stable current, the current is input into the impedance detection unit 32 through the protection unit 31, and the equivalent current and voltage at both ends of the impedance to be measured are obtained through the impedance detection unit 32, and the detected result is fed back to the main control chip MCU, and the detection value of the impedance to be measured is calculated by the main control chip MCU.

[0172] In a possible example scenario, the impedance detection module 30 is connected through the GPIO interface in the main control chip to send and receive current data and voltage data detected by the impedance detection unit 32, and then the detection value of the impedance to be measured Rb is obtained through calculation, and the detection value is fed back to the impedance detection unit 32 through the GPIO port.

[0173] For example, according to Figure 2 and Figure 3 According to the provided diagram, the protection unit 31 in the human body impedance detection circuit includes: a first relay switch S1.

[0174] The first input end of the first relay switch S1 is connected to the first output end of the current control module 20 as the first input end of the protection unit 31, the second input end of the first relay switch S1 is connected to the second output end of the current control module 20 as the second input end of the protection unit 31, the first output end of the first relay switch S1 is connected to the first input end of the impedance detection unit 32 as the first output end of the protection unit 31, the second output end of the first relay switch S1 is connected to the second input end of the impedance detection unit 30 as the second output end of the protection unit 31, and the first relay switch S1 is used to block the high current from flowing to the impedance detection unit 32 when receiving an excessively high current.

[0175] Exemplarily, the internal structure of the protection unit 31 is implemented by a relay. When the current control module outputs an excessively high current, the main control chip MCU controls the first relay switch S1 to be disconnected, thereby preventing the excessively high current from damaging the impedance detection unit 32.

[0176] Optionally, the protection unit 31 may also include a switch device such as an IGBT or a MOS tube, which disconnects the internal connection when an excessively high current or an excessively low current is detected, thereby blocking the current.

[0177] For example, according to Figure 2 and Figure 3 According to the diagram provided, the impedance detection unit 32 in the human body impedance detection circuit includes: a ninth impedance R9, a tenth impedance R10, an eleventh impedance R11, a twelfth impedance R12, a thirteenth impedance R13, a sixth capacitor C6 and a fifth operational amplifier U3A.

[0178] One end of the ninth impedance R9 is connected as the first input end of the impedance detection unit 32, and the other end of the ninth impedance R9 is connected to one end of the tenth impedance R10 and the positive input end of the fifth operational amplifier U3A.

[0179] The other end of the tenth resistor R10 is connected to the tenth ground terminal.

[0180] One end of the eleventh impedance R11 is connected to the second output end of the protection unit 31 as the second input end of the impedance detection unit 32 , and the other end of the eleventh impedance R11 is connected to one end of the twelfth impedance R12 and the reverse input end of the fifth operational amplifier U3A.

[0181] The other end of the twelfth impedance R12 is connected to the output end of the fifth operational amplifier U3A and one end of the thirteenth impedance R13.

[0182] The other end of the thirteenth resistor R13 and one end of the sixth capacitor C6 are connected to the first input end of the main control chip MCU as the output end of the impedance detection unit 32 .

[0183] The other end of the sixth capacitor C6 is connected to an eleventh ground end.

[0184] Exemplarily, the ninth impedance and the eleventh impedance are used as voltage-dividing resistors to protect the impedance detection unit. The tenth impedance is used as a pull-up resistor. The RC loop composed of the thirteenth impedance and the sixth capacitor performs filtering processing for the subsequent circuit.

[0185] In a possible example scenario, the current control module 20 outputs a stable current signal, which is input to the fifth op amp U3A through the protection unit 31. The two input terminals of the fifth op amp U3A are indirectly connected to the two ends of the impedance to be measured Rb. The voltage difference across the impedance to be measured Rb is obtained by comparing the voltage difference detection at the input terminals, and is fed back to the processing unit of the main control chip MCU through filtering. The impedance value across the impedance to be measured Rb is calculated by the current value and voltage value obtained by the processing unit and storage unit of the main control chip MCU.

[0186] according to Figure 2 and Figure 3The diagram provided shows that after the main control chip provides a set square wave signal, first when the first transistor is disconnected, the power conversion module outputs an initial voltage value, and on the basis of the secondary voltage value, the current control module is equivalent to a constant current source to output a stable current to the first relay switch, and when the current is in a safe state, the voltage across the impedance to be measured is obtained through the voltage difference across the fifth op amp, and the obtained voltage value and current value are stored in the storage unit of the main control chip, and the static detection value of the impedance to be measured is calculated by the processing unit of the main control chip. By changing the frequency or amplitude of the square wave output by the main control chip, the voltage value output by the power conversion module is changed, and the current value of the current control module is changed, and then the new detection value corresponding to the impedance to be measured is calculated again by the main control chip, and by comparing with the value obtained in the previous detection, a more accurate impedance value is selected as the reference value for the next comparison, and through multiple dynamic detections, an accurate resistance value of the impedance to be measured is finally obtained, thereby achieving the purpose of improving the detection accuracy.

[0187] Embodiment 3

[0188] Figure 4 Shown is a structural schematic diagram of a human body impedance detection circuit provided in Example 3 of the present application.

[0189] Figure 5 Shown is a structural schematic diagram of another human body impedance detection circuit provided in Example 3 of the present application. Figure 4 and Figure 5 The invention is introduced on the basis of the above-mentioned embodiments. Figure 4 and Figure 5 The structure of the human body impedance detection circuit specifically includes:

[0190] A power conversion module 10 , a current control module 20 , a main control chip MCU and an impedance detection module 30 .

[0191] according to Figure 4 According to the provided diagram, the structure of the human body impedance detection circuit further includes: an electrode selection module 40 and a fine-tuning module 50 .

[0192] The electrode selection module 40 and the fine-tuning module 50 are connected between the current control module 20 and the impedance detection module 30. The first input end of the electrode selection module 40 is connected to the first output end of the current control module 20, the second input end of the electrode selection module 40 is connected to the second output end of the current control module 20, the first output end of the electrode selection module 40 is connected to the first input end of the fine-tuning module 50 and one end of the impedance to be measured Rb, the second output end of the electrode selection module 40 is connected to the second input end of the fine-tuning module 50 and the other end of the impedance to be measured Rb, the electrode selection module 40 is used to select electrodes at different positions in the human body and change the detection value of the impedance to be measured Rb, and the fine-tuning module 50 is used to change the branch current of the impedance to be measured Rb connected in parallel so that the impedance detection module 30 operates in a working current environment.

[0193] Exemplarily, the electrodes are used to contact the human body. Two different electrodes generate two electric potential energies after contacting the human body. The difference between the two electric potential energies is used as the electric energy between the two electrodes, that is, the electric energy of the equivalent impedance.

[0194] The electrode selection module 40 is arranged between the current control module and the impedance to be measured, and the equivalent impedance of different positions of the human body is selected through the electrode selection module 40. By changing the internal switch of the electrode selection module 40, different electrode connections are selected, thereby realizing the detection of the equivalent impedance corresponding to different electrodes. The fine-tuning module is used to change the input current of the impedance detection module to avoid the input of too high current to damage the internal components of the impedance detection module and affect the detection results.

[0195] In a possible example scenario, after selecting a plurality of designated electrodes through the internal setting of the electrode selection module 40, a plurality of equivalent impedances corresponding to the plurality of electrodes are obtained. The current control module 20 provides a stable current for the impedance to be measured Rb, the power conversion module 10 provides a voltage for the impedance to be measured Rb, the voltage signal and the current signal are applied to the selected electrode, two electrodes are selected through the electrode selection module 40, the voltage difference between the two electrodes is equivalent to the voltage difference of the impedance to be measured Rb, and the impedance detection module 30 is used to obtain the voltage and current between the two electrodes, and the impedance detection module 30 is used to feed back to the main control chip MCU for processing, and the equivalent impedance between the two electrodes is calculated (here one of the equivalent impedances is the impedance to be measured), and then the impedance value of the impedance to be measured Rb is detected. By changing the frequency or amplitude of the PWM wave output by the main control chip MCU, and the fine-tuning module changes the size of the branch current and voltage, the detection values ​​of the plurality of impedances to be measured Rb are calculated, and compared with the previous detection value, the impedance value closer to the true value is first selected to improve the accuracy of the detection. After switching to the other two electrodes through the electrode selection module 40, the equivalent impedance between the other electrodes is detected, and the equivalent impedance of the electrodes embedded in the human body is detected by changing the connection relationship of the electrodes.

[0196] according to Figure 5 The diagram provided shows the structure of the human body impedance detection circuit. The electrode selection module 40 includes: a switch selection chip 41, a first electrode rod 42 and a second electrode rod 43. The fine-tuning module 50 includes a plurality of fine-tuning branches connected in parallel. The fine-tuning branches are composed of an impedance R and a switch K in series.

[0197] The first input end of the switch selection chip 41 is connected to the first output end of the current control module 20, the second input end of the switch selection chip 41 is connected to the second output end of the current control module 20, the third input end of the switch selection chip 41 is connected to the fourth output end of the main control chip MCU, the switch selection chip 41 is used to receive the switch control signal output by the main control chip MCU, the first output end of the switch selection chip 41 is connected to the first contact in the first electrode rod 42 and the second electrode rod 43, the second output end of the switch selection chip 41 is connected to the second contact in the first electrode rod 42 and the second electrode rod 43, the third output end of the switch selection chip 41 is connected to the second input end of the main control chip MCU, and the switch selection chip 41 is also used to feedback the switch state to the main control chip MCU.

[0198] The first contacts in the first electrode rod 42 and the second electrode rod 43 , the first input end of the fine-tuning module 50 , and one end of the impedance to be measured Rb are connected to the first input end of the impedance detection module 30 .

[0199] The second contacts in the first electrode rod 42 and the second electrode rod 43 , the second input end of the fine-tuning module 50 and the other end of the impedance to be measured Rb are connected to the second input end of the impedance detection module 30 .

[0200] Optionally, the electrode selection module 40 further includes a seventh capacitor C7 and an eighth capacitor C8. The seventh capacitor C7 is connected between the switch selection chip 41 and the first electrode rod 42, and the eighth capacitor C8 is connected between the switch selection chip 41 and the second electrode rod 43. The current signal output by the switch selection chip 41 is filtered by the seventh capacitor C7 and the eighth capacitor C8 to provide a stable signal for the first electrode rod 42 and the second electrode rod 43.

[0201] Exemplarily, the electrode selection switch 41 is generally composed of a register, a plurality of D flip-flops, a plurality of level converters, etc., to form a selection network to achieve connection and selective conduction of corresponding collection points on the first electrode rod and the second electrode rod. Figure 5 In the example, SWIN1 and SWIN2 are two input terminals, and SWOUT1 and SWOUT are a group of output terminals, transmitting the two selected input signals to the first electrode rod and the second electrode rod.

[0202] Exemplarily, a plurality of contacts are provided on the first electrode rod and the second electrode rod for collecting the electric field at a specified position of the human body after contacting the human body. The contact setting rule can be set in an array or a circular patch shape as required, which is not limited here. The two positions collected on the two electrode rods obtain two collection points, and the voltage difference between the two collection points is equivalent to the voltage across the impedance to be measured.

[0203] In a possible example scenario, after the first electrode rod and the second electrode rod are embedded in the designated position of the human body, the electrode selection switch 41 is used to select the first electrode rod and the second electrode rod to collect two contact electrodes at the contact point of the human body, and the current input by the current control module is input into the fine-tuning module 50. The fine-tuning module 50 adjusts the impedance and the conduction state and the number of closures of the switches in multiple fine-tuning branches according to the current size, and inputs the current signal and the voltage signal into the impedance detection module 30 while ensuring the current safety.

[0204] In a possible example scenario, the first transistor is first controlled to remain disconnected, output an initial power supply, and output a stable current under the action of a current control module. A group of electrodes is selected through an electrode selection unit, and the current input to the fifth op amp is controlled to be within a safe range through a fine-tuning module. The detected voltage and current are fed back to the main control chip, and the initial detection value of the impedance to be measured is calculated; then the first transistor is closed periodically to output a changed voltage to the impedance to be measured, and the current output by the current control module is changed by adjusting the amplitude or frequency of the PWM wave of the main control chip, and then new current and voltage values ​​are obtained through the impedance detection module. After being processed by the main control chip again, a second detection value of the impedance to be measured is calculated. Compared with the initial detection value in the last static state, a detection value closer to the true value is selected for the next dynamic detection comparison process. After multiple detections, a more accurate detection value is obtained; in the same way, other electrode contacts in the electrode selection module are changed, and a human body impedance detection process of equivalent impedance between other electrodes is performed.

[0205] Embodiment 4

[0206] Figure 6 The figure shows a flow chart of a human body impedance detection method provided in the fourth embodiment of the present application. It is applied in a human body impedance detection circuit. Figure 6 The diagram provided, the human body impedance detection method specifically includes:

[0207] S601. Obtain an initial impedance value of an impedance to be measured.

[0208] The initial impedance value mentioned here can be understood as the detection value of the impedance to be measured detected for the first time.

[0209] For example, according to the structure of the human body impedance detection circuit, the detection of human body impedance can be achieved and the detection accuracy can be improved, which is helpful for auxiliary medical research and development and further optimizes the therapeutic effect of micro-detection equipment or micro-therapeutic equipment (such as artificial heart devices) implanted in the human body, which is of great help to medical research.

[0210] In a possible example scenario, after starting the human body impedance detection circuit, the voltage and current of the detected circuit are obtained through the main control chip, and then the voltage and current on both sides of the branch where the impedance to be measured is located are calculated, and then the initial impedance value of the impedance to be measured in the initial state is calculated and stored as a static detection value to provide a reference value for subsequent dynamic detection values.

[0211] S602: Adjust the working current of the current control module to obtain a corresponding adjustment impedance value.

[0212] The regulation process mentioned here can be understood as adjusting the current amplitude or output frequency, or adjusting the signal amplitude or frequency of the received PWM wave, thereby indirectly changing the working current.

[0213] Exemplarily, after obtaining the initial impedance value, in order to improve the detection accuracy, the amplitude or frequency of the PWM wave and other square wave signals (such as DC to AC square wave signals or AC to DC square wave signals, etc.) output by the main control chip can be adjusted, and the changed signal can be fed back to the power conversion module to output an adjusted voltage signal; the changed current signal is output through the current control module, and then the adjusted impedance value of the impedance to be measured is calculated based on the new voltage and current obtained after the adjustment process.

[0214] S603: Determine a target detection value of the impedance to be measured based on the initial impedance value and the adjusted impedance value.

[0215] The target detection value mentioned here can be understood as the detection value determined after static detection and dynamic detection, which is data closer to the actual value.

[0216] Exemplarily, based on the comparison of the initial impedance value obtained in the static state and the adjusted impedance value of the dynamic detection, the impedance value closer to the true value is selected as the target detection value of the impedance to be measured, thereby achieving the purpose of combining static detection with dynamic detection and improving the accuracy of human body impedance detection.

[0217] Figure 7 Shown is a flow chart of another human body impedance detection method provided in Example 4 of the present application. Figure 7 This is introduced based on the previous embodiment. Figure 7 The steps of the human body impedance detection method include:

[0218] S701, controlling the first transistor to remain in an off state, and determining an initial supply voltage value corresponding to the voltage conversion module.

[0219] S702 : Determine an initial current value output by a current control module based on an initial supply voltage value.

[0220] S703: Determine an initial impedance value of the impedance to be measured based on the initial current value and the initial supply voltage value.

[0221] In a possible example scenario, by turning off the first transistor, the battery is used to store energy for the first capacitor, and the generated voltage is used as the initial power supply voltage; when the main control chip provides a set PWM wave signal to the current control module, the current control module is used as a constant current source to output a stable current signal, and the initial current value output by the current control module is determined based on the initial power supply voltage value. The impedance detection module feeds back the received initial power supply voltage value and initial current value to the storage unit of the main control chip for storage, and at the same time, the voltage value and current value of the impedance to be measured are calculated by the main control chip, and then the initial impedance value in the static state is calculated.

[0222] S704, controlling the first transistor to remain in a closed state through the main control chip to determine the regulated voltage value output by the voltage conversion module.

[0223] S705 , adjusting the input signal of the current control module to obtain the adjusted working current output by the current control module.

[0224] S706: Obtain an adjusted impedance value corresponding to the impedance detection unit based on the adjusted voltage value and the operating current.

[0225] Exemplarily, after obtaining the initial impedance value in the static state, the main control chip changes the output square wave signal to control the conduction time of the first transistor, thereby changing the voltage value output by the power conversion module, and the voltage value output after changing the square wave signal is input into the fifth op amp as the adjustment voltage value; at the same time, the main control chip changes the frequency or amplitude of the output PWM wave to change the current output by the current control module, obtains the changed working current, and inputs the adjusted working current into the fifth op amp, and the fifth op amp feeds back the working current and the adjustment voltage to the main control chip for processing and storage. The impedance value of the impedance to be measured in a dynamic environment is calculated by the main control chip, and the dynamically detected impedance value is stored as the adjustment impedance value.

[0226] S707: Obtain the difference between the adjusted impedance value and the initial impedance value.

[0227] S708: When the difference meets a preset threshold condition, the currently adjusted impedance value is used as a target detection value of the impedance to be measured.

[0228] S709: When the operating current of the current control module exceeds the set current threshold, the protection unit is controlled to remain disconnected, or the conduction state of the fine-tuning module is adjusted to start overcurrent protection for the impedance detection unit.

[0229] Exemplarily, the main control chip obtains the initial impedance value under static environment and the adjusted impedance value under dynamic adjustment. By comparing the difference between the two, it is determined whether the difference between the results of the previous and subsequent detections exceeds the set range. The set difference range is used as the threshold condition. When the difference is within the difference range, it indicates that the difference meets the threshold condition, and the adjusted impedance value can be changed. The adjusted impedance value is used as the initial impedance value and as a reference value for the next dynamic detection. After multiple comparisons, the target detection value is obtained.

[0230] Furthermore, after the main control chip changes the square wave signal, the working current output by the current control module changes. When the working current changes and exceeds the set safety current threshold, if the working current is directly input to the fifth op amp, the fifth op amp will be burned due to the large current. In order to protect the normal operation of the device, the switch in the protection unit is disconnected to achieve the purpose of blocking the input of large current, which can protect the safety of the subsequent circuit. Alternatively, by closing multiple fine-tuning branches in the fine-tuning module, the current is shunted, so that the current input to the fifth op amp is reduced, thereby achieving the purpose of overcurrent protection.

[0231] Embodiment 5

[0232] Figure 8 Shown is a schematic diagram of the structure of a detection device provided in Example 5 of the present application. Figure 8 The detection device 800 shown includes: at least one processor 801, a memory 802, at least one network interface 804 and other user interfaces 803. The various components in the detection device 800 are coupled together via a bus system 805. It is understood that the bus system 805 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 805 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, the bus system 805 is not shown in FIG. Figure 8 Various buses are labeled as bus system 805 .

[0233] The user interface 803 may include a display, a keyboard, or a pointing device (eg, a mouse, a trackball, a touch pad, or a touch screen).

[0234] It can be understood that the memory 802 in the embodiment of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 802 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0235] In some implementations, the memory 802 stores the following elements, executable units or data structures, or a subset thereof, or an extended set thereof: an operating system 8021 and an application program 8022 .

[0236] The operating system 8021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application 8022 includes various application programs, such as a media player (Media Player), a browser (Browser), etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present application can be included in the application 8022.

[0237] In the embodiment of the present application, by calling the program or instruction stored in the memory 802, specifically, the program or instruction stored in the application 8022, the processor 801 is used to execute the method steps provided by each method embodiment, for example, including:

[0238] The initial impedance value of the impedance to be measured is obtained; the working current of the current control module is adjusted to obtain the corresponding adjusted impedance value; based on the initial impedance value and the adjusted impedance value, the target detection value of the impedance to be measured is determined.

[0239] The method disclosed in the above embodiment of the present application can be applied to the processor 801, or implemented by the processor 801. The processor 801 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 801. The above processor 801 can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to execute, or the hardware and software units in the decoding processor can be executed. The software unit can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802 and completes the steps of the above method in combination with its hardware.

[0240] It is understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPDevice, DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application, or a combination thereof.

[0241] For software implementation, the technology described herein can be implemented by a unit that performs the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0242] The detection device provided in this embodiment can be Figure 8 The detection device shown in FIG. 1 can perform the following steps: Figure 6-7 All steps of the human body impedance detection method are implemented Figure 6-7 The technical effect of the human body impedance detection method shown in the figure is shown in the figure. Figure 6-7 For the sake of brevity, the relevant description is not repeated here.

[0243] The embodiment of the present application also provides a storage medium (computer-readable storage medium). The storage medium here stores one or more programs. The storage medium may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a read-only memory, a flash memory, a hard disk or a solid-state drive; the memory may also include a combination of the above-mentioned types of memory.

[0244] When one or more programs in the storage medium can be executed by one or more processors, the human body impedance detection method executed on the detection device side can be implemented.

[0245] The processor is used to execute the human body impedance detection control program stored in the memory to implement the following steps of the human body impedance detection method performed on the human body impedance detection device side:

[0246] The initial impedance value of the impedance to be measured is obtained; the working current of the current control module is adjusted to obtain the corresponding adjusted impedance value; based on the initial impedance value and the adjusted impedance value, the target detection value of the impedance to be measured is determined.

[0247] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0248] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0249] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0250] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0251] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0252] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0253] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A human body impedance detection circuit, characterized in that: include: Power conversion module, current control module, main control chip and impedance detection module; The output end of the power conversion module is connected to the first input end of the current control module, and the power conversion module is used to provide a working voltage for the current control module; The second input end of the current control module is connected to the first output end of the main control chip, the third input end of the current control module is connected to the second output end of the main control chip, the first output end of the current control module is connected to the first input end of the impedance detection module and one end of the impedance to be measured, the second output end of the current control module is connected to the second input end of the impedance detection module and the other end of the impedance to be measured, and the current control module is used to provide a stable current signal for the impedance detection module through the control of the main control chip; The output end of the impedance detection module is connected to the first input end of the main control chip. The impedance detection module is used to obtain the equivalent current between the two current signals according to the two current signals output by the current control module, and to obtain the detection value of the impedance to be measured through the voltage across the two ends of the impedance to be measured.

2. The circuit according to claim 1, characterized in that The main control chip is used to transmit a sinusoidal current signal to the current control module, and transmit a stable current signal to the impedance detection module through the current control module. The impedance detection module is also used to analyze the detection value of the impedance to be measured according to the current signal, and feed back the detection value of the impedance to be measured to the main control chip; The main control chip is also used to change the input electrical signal of the power conversion module so that the output of the power conversion module adjusts the voltage signal. The main control chip is also used to change the input electrical signal of the current control module so that the current control module outputs an adjusted current signal. The adjusted voltage signal and the adjusted current signal are input into the impedance detection module, and the adjusted detection value of the impedance to be measured is detected by the impedance detection module.

3. The circuit according to claim 1, characterized in that The power conversion module includes: a power battery, a first inductor, a first transistor, a first diode and a first capacitor; The positive output terminal of the power battery is connected to one end of the first inductor, the negative input terminal of the power battery and the first end of the first transistor and one end of the first capacitor are connected to the first ground terminal, and the power battery provides a start-up voltage for the main control chip and the current control module; The other end of the first inductor is connected to the second end of the first transistor and the reverse input end of the first diode; The forward output end of the first diode and the other end of the first capacitor are connected to the first input end of the current control module as the output end of the power conversion module; The control end of the first transistor is connected to the third output end of the main control chip.

4. The circuit according to claim 1, characterized in that The current control module comprises: A first op amp, a second op amp, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a second capacitor, a third capacitor, a first impedance, and a second impedance; The positive input end of the first op amp is connected to the first output end of the main control chip as the second input end of the current control module, the negative input end of the first op amp is connected to one end of the first impedance and the second end of the first switch tube, and the output end of the first op amp is connected to the control end of the first switch tube; The first end of the first switch tube is connected to the first end of the second switch tube, the control end of the second switch tube and the control end of the third switch tube; The other end of the first impedance is connected to a second ground terminal; The second end of the second switch tube is connected as the first input end of the current control module and is connected to the output end of the power conversion module with the second end of the third switch tube, the second end of the fourth switch tube, and the second end of the fifth switch tube; The first end of the third switch tube is connected to the first end of the sixth switch tube and one end of the second capacitor; The second end of the sixth switch tube is connected to the third ground end, and the control end of the sixth switch tube is connected to the fourth output end of the main control chip; The first end of the fourth switch tube is connected to the first end of the seventh switch tube and one end of the third capacitor, and the control end of the fourth switch tube is connected to the control end of the fifth switch tube, the first end of the fifth switch tube and the first end of the eighth switch tube; The second end of the seventh switch tube is connected to the fourth ground end, and the control end of the seventh switch tube is connected to the fifth output end of the main control chip; The second end of the eighth switch tube is connected to one end of the second impedance and the inverting input end of the second operational amplifier, and the control end of the eighth switch tube is connected to the output end of the second operational amplifier; The positive input terminal of the second operational amplifier is connected to the second output terminal of the main control chip as the third input terminal of the current control module; The other end of the second impedance is connected to a fifth ground terminal; The other end of the second capacitor is connected to the first input end of the impedance detection module and one end of the impedance to be measured as the first output end of the current control module; The other end of the third capacitor serves as the second output end of the current control module and is connected to the second input end of the impedance detection module and the other end of the impedance to be measured.

5. The circuit according to claim 1, characterized in that The current control module comprises: a third operational amplifier, a fourth operational amplifier, a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube, a sixteenth switch tube, a seventeenth switch tube, a third impedance, a fourth impedance, a fifth impedance, a sixth impedance, a seventh impedance, an eighth impedance, a fourth capacitor, and a fifth capacitor; The positive input end of the third op amp is connected to the first output end of the main control chip as the second input end of the current control module, the negative input end of the third op amp is connected to the second end of the ninth switch tube and one end of the third impedance, and the output end of the third op amp is connected to the control end of the ninth switch tube; The first end of the ninth switch tube is connected to the first end of the tenth switch tube, the control end of the tenth switch tube and the control end of the eleventh switch tube; The other end of the third impedance is connected to a sixth ground terminal; The second end of the tenth switch tube is connected to the second end of the eleventh switch tube, the second end of the twelfth switch tube, the second end of the thirteenth switch tube, the second end of the fourteenth switch tube and one end of the fourth impedance; The first end of the eleventh switch tube and the first end of the fourteenth switch tube are connected to the first input end of the impedance detection module as the first output end of the current control module; The control end of the twelfth switch tube is connected to the other end of the fourth impedance and one end of the fifth impedance, and the first end of the twelfth switch tube and the first end of the fifteenth switch tube are connected to the second input end of the impedance detection module as the second output end of the current control module; The other end of the fifth impedance is connected to the first end of the sixteenth switch tube; The first end of the thirteenth switch tube is connected to the control end of the thirteenth switch tube, the control end of the fourteenth switch tube and the first end of the seventeenth switch tube; The control end of the fifteenth switch tube is connected to one end of the sixth impedance and one end of the fourth capacitor, and the second end of the fifteenth switch tube and the other end of the fourth capacitor are connected to the seventh ground end; The other end of the sixth impedance is connected to the first output end of the main control chip; The control end of the sixteenth switch tube is connected to one end of the seventh impedance and one end of the fifth capacitor, and the second end of the sixteenth switch tube and the other end of the fifth capacitor are connected to the eighth ground end; The other end of the seventh impedance is connected to the second output end of the main control chip; The control end of the seventeenth switch tube is connected to the output end of the fourth operational amplifier, and the second end of the seventeenth switch tube is connected to one end of the eighth impedance and the reverse input end of the fourth operational amplifier; The other end of the eighth impedance is connected to a ninth ground terminal; The positive input terminal of the fourth operational amplifier is connected to the second output terminal of the main control chip.

6. The circuit according to claim 1, characterized in that The impedance detection module comprises: Protection unit and impedance detection unit; The first input end of the protection unit is connected to the first output end of the current control module as the first input end of the impedance detection module, the second input end of the protection unit is connected to the second output end of the current control module as the second input end of the impedance detection module, the first output end of the protection unit is connected to the first input end of the impedance detection unit, the second output end of the protection unit is connected to the second input end of the impedance detection unit, and the protection unit is used to block the current from being input to the impedance detection unit when the input current is too large; The output end of the impedance detection unit is connected to the first input end of the main control chip as the output end of the impedance detection module, and the impedance detection unit is used to detect the detection value of the impedance to be measured.

7. The circuit according to claim 6, characterized in that The protection unit comprises: a first relay switch; The first input end of the first relay switch is connected to the first output end of the current control module as the first input end of the protection unit, the second input end of the first relay switch is connected to the second output end of the current control module as the second input end of the protection unit, the first output end of the first relay switch is connected to the first input end of the impedance detection unit as the first output end of the protection unit, the second output end of the first relay switch is connected to the second input end of the impedance detection unit as the second output end of the protection unit, and the first relay switch is used to block the high current from flowing to the impedance detection unit when receiving an excessively high current.

8. The circuit according to claim 6, characterized in that The impedance detection unit includes: a ninth impedance, a tenth impedance, an eleventh impedance, a twelfth impedance, a thirteenth impedance, a sixth capacitor and a fifth operational amplifier; One end of the ninth impedance is connected as the first input end of the impedance detection unit, and the other end of the ninth impedance is connected to one end of the tenth impedance and the positive input end of the fifth operational amplifier; The other end of the tenth impedance is connected to a tenth ground terminal; One end of the eleventh impedance is connected to the second output end of the protection unit as the second input end of the impedance detection unit, and the other end of the eleventh impedance is connected to one end of the twelfth impedance and the reverse input end of the fifth operational amplifier; The other end of the twelfth impedance is connected to the output end of the fifth operational amplifier and one end of the thirteenth impedance; The other end of the thirteenth impedance and one end of the sixth capacitor are connected to the first input end of the main control chip as the output end of the impedance detection unit; The other end of the sixth capacitor is connected to an eleventh ground terminal.

9. The circuit according to claim 1, characterized in that The circuit further includes: an electrode selection module and a fine-tuning module; The electrode selection module and the fine-tuning module are connected between the current control module and the impedance detection module, the first input end of the electrode selection module is connected to the first output end of the current control module, the second input end of the electrode selection module is connected to the second output end of the current control module, the first output end of the electrode selection module is connected to the first input end of the fine-tuning module and one end of the impedance to be measured, the second output end of the electrode selection module is connected to the second input end of the fine-tuning module and the other end of the impedance to be measured, the electrode selection module is used to select electrodes at different positions in the human body and change the detection value of the impedance to be measured, and the fine-tuning module is used to change the branch current of the impedance to be measured connected in parallel so that the impedance detection module operates in a working current environment.

10. The circuit according to claim 9, characterized in that The electrode selection module comprises: a switch selection chip, a first electrode rod and a second electrode rod, and the fine-tuning module comprises a plurality of fine-tuning branches connected in parallel, wherein the fine-tuning branches are composed of an impedance and a switch in series; The first input end of the switch selection chip is connected to the first output end of the current control module, the second input end of the switch selection chip is connected to the second output end of the current control module, the third input end of the switch selection chip is connected to the fourth output end of the main control chip, the switch selection chip is used to receive the switch control signal output by the main control chip, the first output end of the switch selection chip is connected to the first contact in the first electrode rod and the second electrode rod, the second output end of the switch selection chip is connected to the second contact in the first electrode rod and the second electrode rod, the third output end of the switch selection chip is connected to the second input end of the main control chip, and the switch selection chip is also used to feedback the switch state to the main control chip; The first contact points in the first electrode rod and the second electrode rod, the first input end of the fine-tuning module and one end of the impedance to be measured are connected to the first input end of the impedance detection module; The second contacts in the first electrode rod and the second electrode rod, the second input end of the fine-tuning module and the other end of the impedance to be measured are connected to the second input end of the impedance detection module.

11. A human body impedance detection method, applied to the human body impedance detection circuit as claimed in any one of claims 1 to 10, characterized in that: include: Obtaining the initial impedance value of the impedance to be measured; Adjusting the working current of the current control module to obtain a corresponding adjustment impedance value; Based on the initial impedance value and the adjusted impedance value, a target detection value of the impedance to be measured is determined.

12. The method according to claim 11, characterized in that The step of obtaining the initial impedance value of the impedance to be measured comprises: Controlling the first transistor to remain in an off state, and determining an initial supply voltage value corresponding to the voltage conversion module; Determining an initial current value output by the current control module based on the initial supply voltage value; An initial impedance value of the impedance to be measured is determined based on the initial current value and the initial supply voltage value.

13. The method according to claim 11, characterized in that The step of adjusting the working current of the current control module to obtain a corresponding adjustment impedance value includes: The main control chip controls the first transistor to remain in a closed state, thereby determining the regulated voltage value output by the voltage conversion module; Adjusting the input signal of the current control module to obtain an adjusted working current output by the current control module; An adjusted impedance value corresponding to the impedance detection unit is obtained based on the adjusted voltage value and the working current.

14. The method according to claim 12 or 13, characterized in that The step of determining a target detection value of the impedance to be measured based on the initial impedance value and the adjusted impedance value includes: Obtaining a difference between the adjusted impedance value and the initial impedance value; When the difference meets a preset threshold condition, the currently adjusted impedance value is used as the target detection value of the impedance to be measured.

15. The method according to claim 11, characterized in that The method further comprises: When the operating current of the current control module exceeds the set current threshold, the protection unit is controlled to remain disconnected, or the conduction state of the fine-tuning module is adjusted to start the overcurrent protection of the impedance detection unit.

16. A detection device, characterized in that: include: A processor and a memory, wherein the processor is used to execute a control program for human body impedance detection stored in the memory to implement the human body impedance detection method according to any one of claims 11 to 15.

17. A storage medium, characterized in that: The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the human body impedance detection method according to any one of claims 11 to 15.

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