CN209678509U - Signal deteching circuit - Google Patents
Signal deteching circuit Download PDFInfo
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- CN209678509U CN209678509U CN201821973386.4U CN201821973386U CN209678509U CN 209678509 U CN209678509 U CN 209678509U CN 201821973386 U CN201821973386 U CN 201821973386U CN 209678509 U CN209678509 U CN 209678509U
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Abstract
The utility model relates to field of medical technology, particularly disclose a kind of signal deteching circuit, comprising: electro-physiological signals detection chip, contact impedance measuring circuit, buffer circuit, isolation circuit and signal processing circuit；Contact impedance measuring circuit passes sequentially through buffer circuit and isolation circuit and connect with crosslinking electrode line；Contact impedance measuring circuit is used to detect the contact impedance of crosslinking electrode line and human skin；Electro-physiological signals detection chip carries out differential amplification and is filtered to obtain electro-physiological signals for detecting body electrical signals；Buffer circuit and isolation circuit are used to be isolated influence of the detection of contact impedance to electro-physiological signals detection chip；Signal processing circuit is used to assess electro-physiological signals according to contact impedance.It can be seen that using the utility model, using the contact impedance of contact impedance measuring circuit real-time detection crosslinking electrode line and human skin, to guarantee the quality of electro-physiological signals under physiology pyroelectric monitor scene.
Description
Technical field
The utility model relates to field of medical technology, and in particular to a kind of signal deteching circuit.
Background technique
Sleep analysis monitor is an important new technology in current sleep medicine, is claimed again in world's sleep study circle
For " goldstandard " for diagnosing sleep disturbance disease, sleep disturbance related diseases various for diagnosis and treatment ensure that health of people is just playing
Increasingly important role.Wherein, electroencephalogram (electroencephalogram, EEG), electrocardiogram
(electrocardiogram, ECG), electroculogram (electro-oculogram, EOG), electromyogram
The acquisition of (electromyography, EMG) is the important evidence of the various sleep disturbance related diseases of diagnosis and treatment, the physiology of high quality
Electrical signal collection is just particularly important.
In order to preferably inhibit Hz noise in electro-physiological signals collection process, the signal-to-noise ratio of electro-physiological signals is improved, is adopted
With differential amplifier circuit, this requires amplifier ins consistent input impedance and signal amplitude, so leading sleep more
The measuring unit of contact impedance is necessary between electrode and skin in monitoring system.
Sleep analysis monitor product on the market all has the function of impedance detection at present, but the measurement of impedance is main
Thinking is to start impedance measurement module, confirmation electrode contact is good or meets electro-physiological signals acquisition after posting electrode
Impedance measurement is closed after resistance requirements and carries out signal acquisition, has detected whether electrode delamination simultaneously in signal acquisition.Impedance is surveyed
The processing circuit for measuring module is that constant pressure source exports stable voltage, after fixed resistance and electrode contact impedance are divided,
The voltage value at detecting electrode contact impedance both ends, by the corresponding relationship of the voltage value and impedance that detect, to obtain electrode
With the contact impedance value of skin.
It is big by monitoring mode application condition of the electric resistance partial pressure type to contact impedance, because electrode needs to connect human body, examine
Consider the safety of human body, constant voltage output cannot be too high, and when voltage value is not high enough, the changing value of contact impedance becomes in the voltage end of detection
Change is very little, so the contact impedance value error calculated can be very big.Existing equipment has electrode delamination monitoring, lacks in real time
Monitor contact impedance function.The reason is that the acquisition mode of existing equipment is electric resistance partial pressure mode, it is to access direct current on the electrode
Pressure, to real-time detection contact impedance, needs to continue to access DC voltage on the electrode, will affect adopting for Human Physiology electric signal
Collection, and there are security risks.
In addition, sleep analysis monitor is the acquisition equipment of data the whole night, so in monitoring system between electrode and skin
The acquisition of physiological electricity of human body EEG, ECG, EOG, EMG cannot be influenced when contact impedance, and can accurately test out impedance value to be
The important a part of entire acquisition system.A possibility that electrode loosens during sleeping at night is very big, and electrode loosens but without de-
The case where falling may cause contact impedance and become larger, and the signal quality of acquisition is deteriorated, to the last analysis of data the whole night and sleeping disorders
Judgement brings difficulty.And to equipment energy real-time monitoring contact impedance, then need the careful conscientiously observation of medical staff the whole night
Judge whether electrode contact is good, it is very high for the skill requirement of medical worker, experience the application of equipment bad.
Summary of the invention
In view of the above problems, the utility model is proposed to overcome the above problem in order to provide one kind or at least partly solve
The certainly signal deteching circuit of the above problem.
One aspect according to the present utility model provides a kind of signal deteching circuit, comprising: is connected by crosslinking electrode line
It connects the electro-physiological signals detection chip of human body, contact impedance measuring circuit, buffer circuit, isolation circuit and contacts resistance with described
The signal processing circuit that anti-measuring circuit is connected with the electro-physiological signals detection chip；The contact impedance measuring circuit is successively
It is connect by the buffer circuit and the isolation circuit with the crosslinking electrode line；
The contact impedance measuring circuit is used to detect the contact impedance of the crosslinking electrode line and human skin；
The electro-physiological signals detection chip is given birth to for detecting body electrical signals, and carrying out differential amplification to be filtered
Manage electric signal；
The buffer circuit and the isolation circuit are used to be isolated the detection of the contact impedance to the electro-physiological signals
The influence of detection chip；
The signal processing circuit is used to assess the electro-physiological signals according to the contact impedance.
Signal deteching circuit according to the present utility model, comprising: the electro-physiological signals of human body are connected by crosslinking electrode line
Detection chip, contact impedance measuring circuit, buffer circuit, isolation circuit and with the contact impedance measuring circuit and the life
Manage the signal processing circuit of electrical signal detection chip connection；The contact impedance measuring circuit pass sequentially through the buffer circuit and
The isolation circuit is connect with the crosslinking electrode line；The contact impedance measuring circuit for detect the crosslinking electrode line with
The contact impedance of human skin；The electro-physiological signals detection chip carries out differential amplification filter for detecting body electrical signals
Wave handles to obtain electro-physiological signals；The buffer circuit and the isolation circuit are used to be isolated the detection of the contact impedance to institute
State the influence of electro-physiological signals detection chip；The signal processing circuit is used to assess the physiology electric according to the contact impedance
Signal.Using the scheme of the present embodiment, using connecing for contact impedance measuring circuit real-time detection crosslinking electrode line and human skin
Impedance is touched, to guarantee the quality of electro-physiological signals under physiology pyroelectric monitor scene.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift specific embodiment of the present utility model.
Detailed description of the invention
It, below will be to tool in order to illustrate more clearly of the utility model specific embodiment or technical solution in the prior art
Body drawings that need to be used in the embodiment or the prior art description is briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 shows the structure chart of the signal deteching circuit according to the utility model one embodiment；
Fig. 2 shows the measurement model schematic diagrames of the contact impedance measuring circuit in Fig. 1；
Fig. 3 shows the constant-current source connection schematic diagram of a plurality of crosslinking electrode line；
Fig. 4 shows the structure chart of the signal deteching circuit according to the utility model another embodiment；
Fig. 5 shows the structural schematic diagram of the multiway analog switch in Fig. 4；
Fig. 6 shows the structural schematic diagram of isolation circuit and buffer circuit
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality
The ordinary meaning understood with novel one of ordinary skill in the art.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The meaning of " plurality " is two in the description of the present invention,
More than, unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In this application unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
Fig. 1 shows the structure chart of the signal deteching circuit according to the utility model one embodiment.As shown in Figure 1, should
Circuit include: contact impedance measuring circuit 10, by crosslinking electrode line connect human body electro-physiological signals detection chip 11 and
Electricity is isolated in the signal processing circuit 12 that connects with the contact impedance measuring circuit 10 and the electro-physiological signals detection chip 11
Road 13, buffer circuit 14.The contact impedance measuring circuit 10 passes sequentially through the buffer circuit 14 and the isolation circuit 13
It is connect with the crosslinking electrode line.
The contact impedance measuring circuit 10 is used to detect the contact impedance of the crosslinking electrode line and human skin；It is described
Electro-physiological signals detection chip 11 carries out differential amplification and is filtered to obtain electro-physiological signals for detecting body electrical signals.
The detection that the buffer circuit 14 and the isolation circuit 13 are used to be isolated the contact impedance detects the electro-physiological signals
The influence of chip 11；The signal processing circuit 12 is used to assess the electro-physiological signals according to the contact impedance.
In the utility model embodiment, contact resistance of the contact impedance measuring circuit 10 to crosslinking electrode line with human skin
Anti- detection and electro-physiological signals detection chip 11 is all real-time, and relatively independent to the detection of body electrical signals, and
Signal processing circuit 12 then obtains electro-physiological signals detection chip 11 according to the contact impedance that contact impedance measuring circuit 10 detects
The electro-physiological signals taken are assessed.Specifically, signal processing circuit 12 determines whether contact impedance meets preset condition, if
Meeting preset condition, illustrates that the contact of crosslinking electrode line is good, the electro-physiological signals that electro-physiological signals detection chip 11 obtains are desirable,
Noise is relatively good.If being unsatisfactory for preset condition, illustrate the electro-physiological signals signal matter that electro-physiological signals detection chip 11 obtains
Measure poor, loosening occurs in crosslinking electrode line, and can issue alarm in time.Wherein, preset condition refers to that the contact of crosslinking electrode line is good
Resistance requirements that are good or meeting electro-physiological signals acquisition, it is default less than or equal to one to can be contact impedance in practical applications
Impedance value, specific value can according to need setting, and this is not restricted.Realize the contact impedance of real-time detection electrode
Afterwards, alarm will be issued in time as long as electrode wires occur and loosening, there is no need to medical staff to see that the signal quality of equipment comes always
Judge whether electrode wires loosen, is the easier intelligence of application of equipment.
Signal deteching circuit according to the present utility model, the contact impedance measuring circuit 10 is for detecting the lead electricity
The contact impedance of polar curve and human skin；The electro-physiological signals detection chip 11 carries out difference for detecting body electrical signals
Amplification filtering processing is divided to obtain electro-physiological signals；The buffer circuit 14 and the isolation circuit 13 are for being isolated the contact resistance
Influence of the anti-detection to the electro-physiological signals detection chip 11；The signal processing circuit 12 is used to be hindered according to the contact
The anti-assessment electro-physiological signals.Using the scheme of the present embodiment, using 10 real-time detection lead electricity of contact impedance measuring circuit
The contact impedance of polar curve and human skin, to guarantee the quality of electro-physiological signals under physiology pyroelectric monitor scene.
In the utility model embodiment, contact impedance measuring circuit 10 includes voltage detection module 100 and the lead
The constant-current source 101 and the first analog-to-digital conversion output module 102 of electrode wires connection；The voltage detection module 100 is connected in parallel on institute
The both ends of contact impedance are stated, the first analog-to-digital conversion output module 102 is connect with the signal processing circuit 12.The constant current
Source 101 provides AC constant current and flows through the crosslinking electrode line and the contact impedance；The voltage detection module 100 detects
The voltage at the contact impedance both ends；The first analog-to-digital conversion output module 102 is according to the AC constant current and described
Voltage obtains the impedance value of the contact impedance, and exports to the signal processing circuit 12.
Contact impedance test is in body electrical signals collection process while to carry out.The measurement mould of contact impedance measuring circuit
For type referring specifically to Fig. 2, crosslinking electrode line impedence is Re, and contact impedance measuring circuit 10 generates the AC constant current Is of very little,
It is connected on human body by crosslinking electrode line, flows through the equivalent contact impedance Rs between crosslinking electrode line and human skin, can produce
Pressure drop is given birth to, then detects the partial pressure Vs value at the both ends equivalent contact impedance Rs by contact impedance measuring circuit 10.According to Ohm's law, Is
In the case where constant, equivalent contact impedance Rs is bigger, and the partial pressure Vs at the both ends equivalent contact impedance Rs will be bigger, and there are direct proportions
Correlation.So the contact impedance calculated between crosslinking electrode line and human skin can be corresponded to according to partial pressure Vs value, connect
Touching impedance Rs meets following relationship: Rs=K*Vs/Is+M, wherein Vs is the described of contact impedance measuring circuit detection
The voltage at contact impedance both ends, Is are the AC constant current that the constant-current source provides, and K, M are relative coefficient.
In the utility model embodiment, contact impedance measuring circuit 10 is based preferably on the realization of AFE4300 chip.It is based on
Contact impedance between the real-time accurate measurements crosslinking electrode line of AFE4300 chip platform and human skin can make the circuit of detection
It is simple easily to realize.
Electro-physiological signals detection chip 11 include the signal acquisition module 110 being connect with the crosslinking electrode line and with institute
State the second analog-to-digital conversion output module 111 of signal processing circuit connection.The signal acquisition module 110 detects the human body electricity
Signal；The second analog-to-digital conversion output module 111 body electrical signals are exported after differential amplification is filtered to
The signal processing circuit 12.
In the embodiments of the present invention, to lead the crosslinking electrode number that sleeping device uses many more, electro-physiological signals inspection
It surveys chip 11 to connect by a plurality of crosslinking electrode line with human body, the constant-current source is flowed through described in every using hub-and-spoke configuration
The AC constant current of the contact impedance on crosslinking electrode line is equal.As shown in figure 3, constant-current source 101 is using star-like
Structure, the AC constant current provided are flowed into from Iout1, are flowed out from Iout0.The end Iout1 of constant-current source 101 passes through capacitor C, electricity
Resistance R1 connects human body with crosslinking electrode line, and the end Iout0 of constant-current source 101 connects human body, lead electricity with public electrode by capacitor C
One resistance R2 of parallel connection between polar curve and public electrode wire.The end Iout1 of constant-current source 101 also passes through capacitor C, resistance R1, resistance R3
Another capacitor C flows back to the end Iout0 of constant-current source 101, wherein there are also a resistance R2 is in parallel with resistance R3.In this way, the constant-current source
101 flow through the AC constant current phase of the contact impedance on the every crosslinking electrode line using hub-and-spoke configuration
Deng the electric current for ensuring to flow through in each crosslinking electrode line is consistent.
When the acquisition of electro-physiological signals needs many crosslinking electrode lines to be used together, since the measurement of contact impedance is primary only
The contact impedance of a crosslinking electrode line can be detected, cannot a plurality of crosslinking electrode line detect simultaneously, so need increase control opens
It closes to switch over, contact impedance measuring circuit 10 is enabled successively to measure the contact impedance of each crosslinking electrode line.
Fig. 4 shows the structure chart of the signal deteching circuit according to the utility model another embodiment.As shown in figure 4,
Signal deteching circuit further includes a multiway analog switch 15, is connected to the contact impedance measuring circuit 10 and the buffer circuit
Between 14, for carrying out the switching between a plurality of crosslinking electrode line, it is ensured that successively measure a plurality of crosslinking electrode line with
The contact impedance of human body.Due to contact impedance measurement cannot a plurality of crosslinking electrode line detect simultaneously, can only one-time detection
The contact impedance of one crosslinking electrode line, so multiway analog switch 15 is needed to carry out the switching between crosslinking electrode line.
Multiway analog switch 15 include at least connect with the contact impedance measuring circuit 10 control terminal, output end, with
And multiple input terminals, each input terminal pass sequentially through the buffer circuit 14 and the isolation circuit 13 and lead electricity
Polar curve connection, the contact impedance measuring circuit 10 by the multiple input terminals of control terminal control successively with the output
End connection makes the contact impedance measuring circuit 10 successively measure the contact resistance of a plurality of crosslinking electrode line and human body
It is anti-.More specifically, the circuit block diagram of multiway analog switch 15 is as shown in Figure 5, it is preferable that use 4051 chips, including 16 are drawn
Foot, wherein the 1st, 2,4,5,12,13,14,15 pins be input terminal, the 3rd pin be output end, the 6th, 9,10,11 for control
End.3rd pin connects public electrode, and the 6th pin is to forbid holding, and when inputting as high level, which forbids, and disconnects, and inputs
When being zero, which is worked normally.6th pin connects supply voltage through resistance R11.7th, 8 pins are grounded, the 9th, 10,11 pins
It is connect with touching impedance measuring circuit 10.9th pin also connects supply voltage through resistance R12, and the 10th pin also connects power supply through resistance R13
Voltage, the 11st pin also connect supply voltage through resistance R14.16th pin connects supply voltage, also through first capacitor C1 in parallel and
Second capacitor C2 ground connection.1st, 2,4,5,12,13,14,15 pins isolation be followed by different crosslinking electrode lines.Touch impedance measurement electricity
Road 10 by the 6th, 9,10,11 pins control the 1st, 2,4,5,12,13,14,8 input terminals of 15 pins one of them with the
The conducting of 3 pins.
In the present embodiment, the input terminal of multiway analog switch 15 passes sequentially through the buffer circuit 14 and isolation electricity
Road 13 is connect with the crosslinking electrode line for being used as anode, and passes sequentially through the buffer circuit 14 and the isolation circuit 13
It is connect with the crosslinking electrode line for being used as cathode.With continued reference to Fig. 4, multiway analog switch 12 passes sequentially through 14 He of buffer circuit
Isolation circuit 13 is connect with positive crosslinking electrode line, is connected simultaneously also by buffer circuit 14 and isolation circuit 13 and negative crosslinking electrode line
It connects.
In the utility model embodiment, isolation circuit 13 is connected to the multiway analog switch 15 and the crosslinking electrode
Between line, DC voltage for being isolated on the crosslinking electrode line can prevent DC voltage direct by crosslinking electrode line
It is connected in skin ambustion on human body, plays the role of protecting personal safety.Buffer circuit 14 is connected to the multiway analog switch 15
Between the isolation circuit 13, for described in the isolation when the multiway analog switch 15 switches or acquires the contact impedance
Acquisition of the electro-physiological signals detection chip 11 to electro-physiological signals.Amplifier in buffer circuit 14 needs to select high input resistance
Anti-, the Weak current avoided passing through on crosslinking electrode line shunts.The setting of buffer circuit 14 can obstruct analog switch 15
Switching or contact impedance measuring circuit 10 acquire contact impedance partial pressure value when to 11 normal acquisition of electro-physiological signals detection chip
The influence of electro-physiological signals is only accomplished not influencing normal acquisition electro-physiological signals, can just detect contact impedance in real time.
In the present embodiment, as shown in fig. 6, the isolation circuit 13 includes first capacitor C0, first resistor R0 and the
Two resistance R, the buffer circuit 14 include operational amplifier M；The output end m0 connection multichannel mould of the operational amplifier M
Quasi- switch 15, positive input terminal m1 connect with the first end of the first end of the first resistor R0 and the second resistance R, bear defeated
Enter to hold m2 to connect with the output end m0, the second termination power of the first resistor R0, the second termination of the second resistance R
Ground, the positive output end m1 of the operational amplifier M is also by the first capacitor C0 connection crosslinking electrode line, and passing through should
Crosslinking electrode line connects human body.
According to the signal deteching circuit of the utility model, the crosslinking electrode line of test and the contact impedance value accuracy energy of human body
Accomplish 5%, because the AC current values exported by AFE4300 are within 20uA, it is the safe electric of human body that alternating current is very faint
Flow valuve is hereinafter, small electric current is after contact impedance, and contact impedance variation is bigger, and the voltage value detected is more obvious.To adopting
The data collected carry out visual analyzing, it is found that there are very strong linear relationship between voltage value and impedance value, calculate it
Linear dependence finds that its linear dependence numerical value is up to 0.9678.Least square method can be used and carry out multinomial linear fit,
Linear regression is carried out using 3 power multinomials when doing data algorithm processing.Most impedance measurements known to after verifying with
Error between true value is 5% hereinafter, improving the accuracy of contact impedance detected value.
The signal deteching circuit of the utility model can more accurately measure the contact impedance of crosslinking electrode line and human body,
Whether better judgement is matched with for the differential amplification both ends input impedance of electro-physiological signals, it is better to collect signal-to-noise ratio
Electro-physiological signals provide advantage.Moreover, it is achieved that after the contact impedance of real-time detection crosslinking electrode line, as long as there is lead
Electrode wires loosen will issue alarm in time, see the signal quality of equipment always there is no need to personnel to judge that crosslinking electrode line is
It is no to loosen, it is the easier intelligence of application of equipment.By the detection of real-time contact impedance to ensure that physiology pyroelectric monitor field
The quality of electro-physiological signals under scape, electrode wires loosen auto-alarming, more embody the automatic intelligent feature of acquisition equipment.
Signal deteching circuit according to the present utility model, comprising: the electro-physiological signals of human body are connected by crosslinking electrode line
Detection chip, contact impedance measuring circuit, buffer circuit, isolation circuit and with the contact impedance measuring circuit and the life
Manage the signal processing circuit of electrical signal detection chip connection；The contact impedance measuring circuit pass sequentially through the buffer circuit and
The isolation circuit is connect with the crosslinking electrode line；The contact impedance measuring circuit for detect the crosslinking electrode line with
The contact impedance of human skin；The electro-physiological signals detection chip carries out differential amplification filter for detecting body electrical signals
Wave handles to obtain electro-physiological signals；The buffer circuit and the isolation circuit are used to be isolated the detection of the contact impedance to institute
State the influence of electro-physiological signals detection chip；The signal processing circuit is used to assess the physiology electric according to the contact impedance
Signal.Using the scheme of the present embodiment, using connecing for contact impedance measuring circuit real-time detection crosslinking electrode line and human skin
Impedance is touched, to guarantee the quality of electro-physiological signals under physiology pyroelectric monitor scene.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Especially, as long as structural conflict is not present, items technical characteristic mentioned in the various embodiments can combine in any way
Get up.The utility model is not limited to specific embodiment disclosed herein, but including falling within the scope of the appended claims
All technical solutions.
Claims (10)
1. a kind of signal deteching circuit characterized by comprising detected by the electro-physiological signals that crosslinking electrode line connects human body
Chip, contact impedance measuring circuit, buffer circuit, isolation circuit and with the contact impedance measuring circuit and the physiology electric
The signal processing circuit of signal detection chip connection；The contact impedance measuring circuit passes sequentially through the buffer circuit and described
Isolation circuit is connect with the crosslinking electrode line；
The contact impedance measuring circuit is used to detect the contact impedance of the crosslinking electrode line and human skin；
The electro-physiological signals detection chip carries out differential amplification and is filtered to obtain physiology electric for detecting body electrical signals
Signal；
The detection that the buffer circuit and the isolation circuit are used to be isolated the contact impedance detects the electro-physiological signals
The influence of chip；
The signal processing circuit is used to assess the electro-physiological signals according to the contact impedance.
2. circuit according to claim 1, which is characterized in that the contact impedance measuring circuit includes voltage detecting mould
Block, the constant-current source being connect with the crosslinking electrode line and the first analog-to-digital conversion output module；The voltage detection module is in parallel
At the both ends of the contact impedance, the first analog-to-digital conversion output module is connect with the signal processing circuit；
The constant-current source provides AC constant current and flows through the crosslinking electrode line and the contact impedance；The voltage detecting mould
Block detects the voltage at the contact impedance both ends；The first analog-to-digital conversion output module is according to the AC constant current and institute
The impedance value that voltage obtains the contact impedance is stated, and is exported to the signal processing circuit.
3. circuit according to claim 2, which is characterized in that the contact impedance Rs meets following relationship: Rs=K*
Vs/Is+M, wherein the Vs is the voltage at the contact impedance both ends of contact impedance measuring circuit detection, the Is
For the AC constant current that the constant-current source provides, the K, the M are relative coefficient.
4. circuit according to claim 2, which is characterized in that the electro-physiological signals detection chip described is led by a plurality of
Connection electrode wires are connect with human body, and the constant-current source flows through the contact on the every crosslinking electrode line using hub-and-spoke configuration
The AC constant current of impedance is equal.
5. circuit according to claim 4, which is characterized in that the signal deteching circuit further includes that a multi-channel analog is opened
Close, be connected between the contact impedance measuring circuit and the buffer circuit, for carry out a plurality of crosslinking electrode line it
Between switching.
6. circuit according to claim 5, which is characterized in that the multiway analog switch, which is included at least, contacts resistance with described
Control terminal, output end and the multiple input terminals of anti-measuring circuit connection, each input terminal pass sequentially through the buffering electricity
Road and the isolation circuit are connect with the crosslinking electrode line, and the contact impedance measuring circuit is controlled more by the control terminal
A input terminal is successively connected to the output end, and the contact impedance measuring circuit is made successively to measure a plurality of lead electricity
The contact impedance of polar curve and human body.
7. circuit according to claim 6, which is characterized in that the input terminal of the multiway analog switch passes sequentially through
The buffer circuit and the isolation circuit are connect with the crosslinking electrode line for being used as anode, while passing sequentially through the buffering
Circuit and the isolation circuit are connect with the crosslinking electrode line for being used as cathode.
8. circuit according to claim 5, which is characterized in that the isolation circuit include first capacitor, first resistor with
And second resistance, the buffer circuit include operational amplifier；The output end of the operational amplifier connects the multi-channel analog
Switch, positive output end are connect with the first end of the first end of the first resistor and the second resistance, negative input end and institute
State output end connection, the second termination power of the first resistor, the second end ground connection of the second resistance, the operation amplifier
The positive output end of device also connects the crosslinking electrode line by the first capacitor.
9. circuit according to claim 1, which is characterized in that the contact impedance measuring circuit is based on AFE4300 chip
It realizes.
10. circuit according to claim 1, which is characterized in that the electro-physiological signals detection chip includes leading with described
The signal acquisition module of connection electrode wires connection and the second analog-to-digital conversion output module being connect with the signal processing circuit；
The signal acquisition module detects the body electrical signals；The second analog-to-digital conversion output module is used for the human body
Electric signal exports after differential amplification is filtered to the signal processing circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821973386.4U CN209678509U (en) | 2018-11-27 | 2018-11-27 | Signal deteching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821973386.4U CN209678509U (en) | 2018-11-27 | 2018-11-27 | Signal deteching circuit |
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| CN209678509U true CN209678509U (en) | 2019-11-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector detection device and detection method |
| CN109528193A (en) * | 2018-11-27 | 2019-03-29 | 深圳和而泰数据资源与云技术有限公司 | Signal deteching circuit |
| CN112957026A (en) * | 2021-02-05 | 2021-06-15 | 上海爻火微电子有限公司 | Detection circuit for access impedance and electronic equipment |
| CN113093061A (en) * | 2021-04-22 | 2021-07-09 | 北京机械设备研究所 | Flexible array electrode on-off detection method based on sweep frequency screening |
| WO2022035360A1 (en) * | 2020-08-11 | 2022-02-17 | Общество с ограниченной ответственностью "ЮНО" | Device for monitoring the vital signs of a child |
| WO2024055301A1 (en) * | 2022-09-16 | 2024-03-21 | 深圳市韶音科技有限公司 | Signal measurement circuit and method |
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2018
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| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector detection device and detection method |
| CN109528193A (en) * | 2018-11-27 | 2019-03-29 | 深圳和而泰数据资源与云技术有限公司 | Signal deteching circuit |
| WO2022035360A1 (en) * | 2020-08-11 | 2022-02-17 | Общество с ограниченной ответственностью "ЮНО" | Device for monitoring the vital signs of a child |
| CN112957026A (en) * | 2021-02-05 | 2021-06-15 | 上海爻火微电子有限公司 | Detection circuit for access impedance and electronic equipment |
| CN113093061A (en) * | 2021-04-22 | 2021-07-09 | 北京机械设备研究所 | Flexible array electrode on-off detection method based on sweep frequency screening |
| WO2024055301A1 (en) * | 2022-09-16 | 2024-03-21 | 深圳市韶音科技有限公司 | Signal measurement circuit and method |
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Address after: 518000 Guangdong science and technology innovation and Research Institute, Shenzhen, Shenzhen, Nanshan District No. 6, science and technology innovation and Research Institute, Shenzhen, D 10, 1004, 10 Patentee after: Shenzhen Hetai intelligent home appliance controller Co.,Ltd. Address before: 518000 Guangdong science and technology innovation and Research Institute, Shenzhen, Shenzhen, Nanshan District No. 6, science and technology innovation and Research Institute, Shenzhen, D 10, 1004, 10 Patentee before: SHENZHEN H&T DATA RESOURCES AND CLOUD TECHNOLOGY Ltd. |