CN208659358U - A kind of electrode multiplex circuit and wearable device promoting body fat rate accuracy of measurement - Google Patents
A kind of electrode multiplex circuit and wearable device promoting body fat rate accuracy of measurement Download PDFInfo
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- CN208659358U CN208659358U CN201721789063.5U CN201721789063U CN208659358U CN 208659358 U CN208659358 U CN 208659358U CN 201721789063 U CN201721789063 U CN 201721789063U CN 208659358 U CN208659358 U CN 208659358U
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Abstract
The utility model discloses a kind of electrode multiplex circuits and wearable device for promoting body fat rate accuracy of measurement, including four electrodes, body fat rate measurement module, Electrocardiography module, analog switch chip and central processing unit；Four electrode interfaces of the body fat rate measurement module directly connect one to one with four electrodes；The analog switch chip has enabled turn-off function, including four-way switch channel, the one end in the four-way switch channel connects one to one with four electrodes respectively, the other end connects the electrode interface of Electrocardiography module, and is shorted the other end of a portion switching channels according to the selection of the quantity of the electrode interface of Electrocardiography module；The central processing unit carries out on-off control to the four-way switch channel of analog switch chip.Using the electrode multiplexing technology of the utility model, body fat rate measurement and Electrocardiography dual role can satisfy, and can promote the accuracy of body fat rate measurement.
Description
Technical field
The utility model belongs to wearable device technical field, specifically, being to be related to a kind of apply in wearable device
In electrode multiplex circuit.
Background technique
Wearable device be it is a kind of directly can wear or be integrated into it is portable in the clothes or accessory of user
Electronic product.Wearable device is not only a kind of hardware device, can more be handed over by software support and data interaction, cloud
Mutually realize powerful function, wearable device brings huge transformation to people's lives, perception.
Current wearable device is mostly based on smartwatch and Intelligent bracelet.Existing smartwatch or Intelligent bracelet are removed
Original step counting, sleep monitor outside heart rate detecting function, gradually start to add the function such as body fat rate, electrocardiogram and blood pressure measurement
Energy.It realizes these new functions, generally requires assembly electrode piece, electrode slice on smartwatch or Intelligent bracelet and connect with human skin
Touching, for acquiring the bioelectrical signals of human body.For example, body fat rate measurement needs 4 electrodes, Electrocardiography needs 2 or 3
Electrode.If realizing body fat rate measurement and two functions of Electrocardiography on smartwatch or Intelligent bracelet, need to assemble 7
Electrode.Since the surface area of smartwatch and Intelligent bracelet is very limited, assembling 7 electrodes be cannot achieve, and therefore, it is necessary to use
Electrode multiplexing technology realizes body fat rate measurement and Electrocardiography dual function.
Previous electrode multiplexing technology is usually directly to be realized by analog switch switching, although it realizes electrode
The function of multiplexing, but there is a problem of body fat rate measurement inaccuracy.Tracing it to its cause is, analog switch can generate over the ground in closure
Closure capacitor, bioelectrical signals amplitude very little when body fat rate measures, it is serious that closure capacitor will lead to its decaying, eventually leads to
Body fat rate measurement inaccuracy.
Summary of the invention
The utility model proposes a kind of completely new electrode multiplex circuit skill to promote the accuracy that body fat rate measures
Art using the achievable body fat rate measurement of a set of electrode and Electrocardiography dual function, and can guarantee the standard of two functional tests
Exactness.
In order to solve the above technical problems, the utility model is achieved using following technical scheme:
The utility model in one aspect, proposes a kind of electrode multiplex circuit for promoting body fat rate accuracy of measurement, packet
Include four electrodes, body fat rate measurement module, Electrocardiography module, analog switch chip and central processing unit；Wherein, the body
Rouge rate measurement module is used to generate body fat rate data according to collected bioelectrical signals, including four electrode interfaces, and described four
A electrode interface directly connects one to one with four electrodes；The Electrocardiography module is used for according to collected
Bioelectrical signals generate electrocardiogram (ECG) data, including two or three electrode interfaces；The analog switch chip includes that four-way switch is logical
Road, the one end in the four-way switch channel connect one to one with four electrodes respectively, and the other end connects the electrocardio
The electrode interface of figure detection module, and selected according to the quantity of the electrode interface of Electrocardiography module by a portion
The other end of switching channels is shorted；The central processing unit outputs enable signal to the enabled of the analog switch chip
End carries out on-off control to the four-way switch channel of the analog switch chip.
When the electrode interface of the Electrocardiography module is three, by the other end of switching channels described in two-way
After short circuit, it is then connected to one of electrode interface of the Electrocardiography module.
When the electrode interface of the Electrocardiography module is two, the four-way switch channel is divided into two groups,
After the other end in the double switch channel in each group is shorted, respectively with two electrodes of the Electrocardiography module
Interface connects one to one.
By being shorted, two electrodes can be synthesized into an electrode, to increase the contact area of electrode and skin, improve life
The acquisition quality of object electric signal.
It preferably, further include zero resistance in the electrode multiplex circuit, the other end of the switching channels is preferred
The short circuit of selectivity is realized by zero resistance.It carries out being shorted the compatibility that circuit board can be improved using zero resistance, so that same
Block circuit board is not only suitable for tool, and there are two the Electrocardiography module of electrode interface (welding two zero resistances) on circuit boards, but also
Being suitable for tool, there are three the Electrocardiography module of electrode interface (welding a zero resistance on circuit boards).
In order to play the role of electrostatic protection, it is additionally provided with four tunnel transient states in the electrode multiplex circuit and inhibits two poles
Pipe is connected to described four between electrode and ground correspondingly.
Preferably, the central processing unit connects the body fat rate measurement module, is controlling the switch chip conducting
It period, controls the body fat rate measurement module and closes, emit pumping signal to avoid by body fat rate measurement module, to electrocardiogram
Detection impacts, and then improves the accuracy and reliability of Electrocardiography.
In order to further increase the accuracy of body fat rate measurement, the analog switch chip is preferably using with enabled shutdown
Input capacitance after function and the shutdown of its four-way switch channel is less than the integrated chip of 20pF.
The utility model is on the other hand, it is also proposed that a kind of wearable device, including the measurement of four electrodes, body fat rate
Module, Electrocardiography module, analog switch chip and central processing unit；Wherein, the body fat rate measurement module is used for basis
Collected bioelectrical signals generate body fat rate data, including four electrode interfaces, four electrode interfaces directly with it is described
Four electrodes connect one to one；The Electrocardiography module is used to generate electrocardio number according to collected bioelectrical signals
According to, including two or three electrode interfaces；The switch chip includes four-way switch channel, the one end in the four-way switch channel
It connecting one to one respectively with four electrodes, the other end connects the electrode interface of the Electrocardiography module,
And the other end of a portion switching channels is shorted according to the selection of the quantity of the electrode interface of Electrocardiography module；
The central processing unit outputs enable signal to the enable end of the analog switch chip, to described in the analog switch chip
Four-way switch channel carries out on-off control.
When the wearable device is smartwatch or Intelligent bracelet, four electrodes include being laid in smartwatch
Or the shell of Intelligent bracelet positive first electrode and third electrode and be laid in the shell the back side second electrode
With the 4th electrode, and the shell is exposed to, the back side of the shell is worn on people in the smartwatch or Intelligent bracelet
Skin contact when in the wrist of body, with wrist.
Preferably, when the electrode interface of the Electrocardiography module is three, by the second electrode and the 4th electricity
It is extremely short to connect；When the electrode interface of the Electrocardiography module is two, the first electrode and third electrode are shorted, and
The second electrode and the 4th electrode are shorted.
Further, it is additionally provided with display screen on the wearable device, the central processing unit is connected, for showing
The body fat rate and electrocardiogram of wearer.
Compared with prior art, the advantages and positive effects of the utility model are as follows: the electrode using the utility model is multiplexed
Technology, four electrodes, which are only used only, can meet body fat rate measurement and the dual test assignment of Electrocardiography, not only reduce electricity
The usage quantity of pole piece, reduces hardware cost, improves the aesthetics of wearable device appearance, and by surveying body fat rate
Amount is separated from analog switch, makes bodily fat measurement signal without analog switch chip, and is directly surveyed in electrode and body fat rate
It is transmitted between amount module, it is possible thereby to the closure capacitor of analog switch chip is avoided to generate decaying to bodily fat measurement signal, thus
Greatly improve the accuracy of body fat rate measurement.The electrode multiplexing technology is applied in wearable device, can help to mention
Rise the usage experience of user.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the embodiment for the electrode multiplex circuit that the utility model is proposed；
Fig. 2 is the circuit diagram of another embodiment for the electrode multiplex circuit that the utility model is proposed；
Fig. 3 is a kind of Facad structure of embodiment of the smartwatch of the electrode multiplex circuit design based on the utility model
Schematic diagram；
Fig. 4 is a kind of structure schematic diagram of embodiment of smartwatch shown in Fig. 3.
Specific embodiment
Specific embodiment of the present utility model is described in more detail with reference to the accompanying drawing.
As shown in Figure 1 and Figure 2, the electrode multiplex circuit of the present embodiment includes four electrodes, respectively first electrode P1, the
Four electrode P1-P4 are connected directly to body fat rate measurement module by two electrode P2, third electrode P3 and the 4th electrode P4,
And it connects one to one with four electrode interface A1-A4 of body fat rate measurement module.Meanwhile selection one has enabled shutdown function
The analog switch chip U1 of energy is connected between four electrode P1-P4 and the electrode interface of Electrocardiography module, with control
Four electrode P1-P4 are connected to Electrocardiography module selective processed, realize electrode P1-P4 to body fat rate measurement and the heart
The multiplexing of electrograph detection.
The analog switch chip U1 of the present embodiment should at least have four-way switch channel, by the one of the four-way switch channel
It holds COM1-COM4(for the sake of convenient for distinguishing, hereinafter referred to as input terminal, but does not limit the flow direction of signal, electric signal can both pass through end
Sub- COM1-COM4 is flowed into, and can also be flowed out via COM1-COM4) it connects one to one respectively with four electrode P1-P4, by four
The other end NO1-NO4(in way switch channel is for the sake of convenient for distinguishing, hereinafter referred to as output end, but does not limit the flow direction of signal, telecommunications
Number can both be flowed into, can also be flowed out via NO1-NO4 by terminal NO1-NO4) electrode of connection Electrocardiography module connects
Mouthful, and select a part to be shorted in output end NO1-NO4 according to the quantity of the electrode interface of Electrocardiography module.For example,
If the Electrocardiography module includes three electrode interfaces B1, B2, B3, as shown in Figure 1, can be by output end NO2 and NO4
After short circuit, be then connected to the electrode interface B2 of Electrocardiography module, and by output end NO1 and NO3 respectively with Electrocardiography
Other two electrode interface B1, B3 of module connect one to one.Since output end NO2 and NO4 are shorted, in control mould
When the four-way switch channel closure of quasi- switch chip U1 carries out Electrocardiography, the second electrode P2 and the 4th electrode P4
Be connected one electrode of synthesis.If the Electrocardiography module includes two electrode interfaces B1, B2, as shown in Fig. 2, can incite somebody to action
After the output end NO1 and NO3 of analog switch chip U1 is shorted, it is connected to the electrode interface B1 of Electrocardiography module, and will be defeated
After outlet NO2 and NO4 are shorted, it is connected to the electrode interface B2 of Electrocardiography module.Due to output end NO1 and NO3 be shorted,
NO2 and NO4 is shorted, therefore, when the four-way switch channel closure for controlling analog switch chip U1 carries out Electrocardiography,
The first electrode P1 is connected one electrode of synthesis with third electrode P3, and the second electrode P2 is connected synthesis with the 4th electrode P4
One electrode.Two electrodes are synthesized into an electrode, the contact area of electrode and skin can be increased, to help to improve life
The acquisition quality of object electric signal.
In the present embodiment, it is preferred to use the resistance (zero resistance) of 0 Ω carries out the output end of analog switch chip U1 short
It connects.As shown in Figure 1, can use 0 Ω's for the Electrocardiography module including three electrode interface B1-B3
Resistance R1 is connected between the output end NO2 and NO4, realizes that output NO2 and NO4 is shorted.As shown in Fig. 2, for including two
For the Electrocardiography module of a electrode interface B1, B2, it can be connected to using resistance R1, R2 of two 0 Ω described
Between output end NO1 and NO3 and between output end NO2 and NO4, to realize output end NO1 and NO3 short circuit and output end
NO2 and NO4 is shorted.Two can be reserved in advance when making printed circuit board using the short circuit that zero resistance carries out output terminal
The welding position of a zero resistance R1, R2.It, can be according to the electrode interface of selected Electrocardiography module in practical fabric swatch
Quantity, one or two zero resistance R1, R2 is welded on the welding position by selection, thus can meet electrocardiogram inspection
Survey the connection request between module and analog switch chip U1.Phase can be used in different types of Electrocardiography module as a result,
Same circuit board, to improve the versatility of circuit board.
The analog switch chip U1 of the present embodiment controls its four-way switch channel closure according to received enable signal
Or disconnect, the enable end EN of the analog switch chip U1 is connected to central processing unit, when making for central processing unit output
When energy signal is high level, analog switch chip U1 controls its four-way switch channel and thoroughly turns off, and cuts off Electrocardiography module
With the connecting path of electrode P1-P4, and Electrocardiography module and body fat rate measurement module is isolated.When central processing unit output
When enable signal is low level, analog switch chip U1 controls its four-way switch channel closure, makes Electrocardiography module
It is connected to electrode P1-P4.
For Fig. 1, analog switch chip U1 shown in Fig. 2, if the input terminal (such as COM1) in its each way switch channel
It can be connected to selection one of in two output ends (such as NC1, NO1) of the switching channels, then also need a terminal
Sub- selection signal is transmitted to the terminal selection pin IN of the analog switch chip U1, to select input terminal COMx(x=1,2,3,
4) with output end NCx(x=1,2,3,4) be connected to or with output end NOx(x=1,2,3,4) be connected to.In the present embodiment, described
Terminal selection signal can be generated and sent to the terminal of the analog switch chip U1 by central processing unit and select pin IN.When
When terminal selection signal is low level, indicate that selection input terminal COM1-COM4 is connected to output end NC1-NC4；And when terminal selects
Select signal be high level when, indicate selection input terminal COM1-COM4 be connected to output end NO1-NO4.
The present embodiment is also laid in the position of neighbouring four electrode P1-P4 there are four TVS diode (TVS, Transient
Voltage Suppressor, Transient Suppression Diode) ESD1-ESD4, each electrode P1/P2/P3/P4 is passed through one respectively
A TVS diode ESD1/ESD2/ESD3/ESD4 ground connection, to play the role of electrostatic protection.
It is analog switch chip U1 power supply using system power supply VSYS_3V, is connected to the power end V of analog switch chip U1
+, and be grounded by filter capacitor C1, to improve the stability of power supply.
Below with reference to circuit structure shown in FIG. 1, the concrete operating principle of the electrode multiplex circuit of the present embodiment is carried out
It is described in detail.
When needing to carry out body fat rate measurement, is controlled by central processing unit and connect four electrodes in analog switch chip U1
The four-way switch channel of P1-P4 disconnects.For example, exporting the enable signal of high level to analog switch chip by central processing unit
The enable end EN of U1, at this point, no matter the terminal selection of analog switch chip U1 pin IN receives is high level or low electricity
Flat terminal selection signal, the four-way switch channel are in the state thoroughly disconnected, thus by body fat rate measurement module with
Electrocardiography module is kept apart.The direct-connected four electrode P1-P4 of body fat rate measurement module are detected by four electrode P1-P4
The bioelectrical signals of human body calculate and generate body fat rate data, and are sent to the central processing unit.
Since the switching channels in analog switch chip U1 can generate closure capacitor in closure, which can be to body
Collected bioelectrical signals cause to decay in rouge rate measurement process, and therefore, the present embodiment is by the life in body fat rate measurement process
Object electric signal is directly sent to body fat rate measurement module by electrode without analog switch chip U1, it is possible thereby to improve body
The accuracy of rouge rate measurement.Since the input terminal COM1-COM4 of analog switch chip U1 is again connected on electrode P1-P4, because
This, in order to avoid the influence of closure capacitor in body fat rate measurement process, it is desirable that the switching channels in analog switch chip U1 must
It must thoroughly turn off, that is, it is required that analog switch chip U1 has enabled turn-off function, and the input after the shutdown of its four-way switch channel
Capacitor is necessarily less than 20pF, to reduce influence of the input capacitance to body fat test signal, improves the accuracy of body fat rate measurement.Make
For a kind of preferred embodiment of the present embodiment, the analog switch chip U1 can select the TS3A5018RSVR chip of TI brand,
It has enabled turn-off function, and the input capacitance after the shutdown of its four-way switch channel is less than 20pF, can satisfy the electrode
The design requirement of multiplex circuit.And the PI3A3899 chip of Pericom brand and the WAS4799Q chip of Wei Er brand do not have then
This standby function, therefore it is not able to satisfy design requirement.Meanwhile the switching circuit of transistor design is utilized for triode, metal-oxide-semiconductor etc.
Or switch chip generally can all be greater than 20pF since the parasitic capacitance of transistor is larger, therefore, be also not suitable for applying at this
In the design for the electrode multiplex circuit that embodiment is proposed.
Although analog switch chip U1 can generate closure capacitor, analog switch chip U1 cannot be omitted.Because simulation is opened
After closing chip U1 omission, body fat rate measurement module will be direct-connected with Electrocardiography module, the input impedance of Electrocardiography module
Body fat rate measurement will be impacted, keep body fat rate measurement data inaccurate.
When needing to carry out Electrocardiography, body fat rate measurement module is controlled by central processing unit first and is closed, that is, is stopped
Only run.Then, the four-way switch channel that four electrode P1-P4 are connected in analog switch chip U1 is controlled by central processing unit
Closure.For example, exporting the enable end EN of low level enable signal to analog switch chip U1 by central processing unit, and export
The terminal of the terminal selection signal of high level to analog switch chip U1 select pin IN.At this point, analog switch chip U1's is defeated
Enter to hold COM1-COM4 to be connected to its output end NO1-NO4 one-to-one correspondence, Electrocardiography module is made to connect electrode P1-P4, acquisition
The bioelectrical signals of human body.During the four-way switch channel of analog switch chip U1 is closed, although Electrocardiography
Module is physically joined together with body fat rate measurement module, but due to test electrocardiogram when, the test function of body fat rate measurement module
It can not be triggered, any pumping signal will not be emitted, Electrocardiography would not also be impacted.In order to guarantee that electrocardiogram is examined
The reliability and accuracy of survey, the present embodiment preferably use the Electrocardiography module of three-electrode configuration, rather than two electrode configurations
Electrocardiography module.
In the present embodiment, the body fat rate measurement module can be set using bio-electrical impedance processor cooperation peripheral circuit
It counts；The Electrocardiography module can be formed using Electrocardiography chip cooperation periphery circuit design.The center
Processor can have the integrated chip of data-handling capacity using single-chip microprocessor MCU, digital signal processor DSP etc., connect institute
The body fat rate measurement module and Electrocardiography module stated are applied not only to body fat rate measurement module and Electrocardiography module
Working condition is controlled, and can receive the test knot of body fat rate measurement module and the output of Electrocardiography resume module
Fruit, and the output for driving the display screen connecting with central processing unit to carry out test result is shown.
The electrode multiplex circuit of the present embodiment is applied in wearable device, is especially suitable for applying in smartwatch and intelligence
In energy bracelet, to realize the bodily fat measurement and Electrocardiography dual function of wearable device.To apply below the present embodiment
For in smartwatch, the electrode multiplexing technology of the present embodiment is specifically addressed.
As shown in Figure 3, Figure 4, the smartwatch of the present embodiment include shell 1, the watchband 2 for being mounted on 1 opposite sides of shell,
3, the positive dial plate 4 of shell 3 is set, display screen is provided with below dial plate 4 (preferably using touching display screen as man-machine
Interactive interface), it can show the information such as time, body fat rate and electrocardiogram.The first electrode P1 and third electrode P3 is installed
In the front of shell 1, and expose to shell 1；The second electrode P2 and the 4th electrode P4 are mounted on to the back side 5 of shell 1, and
Expose to the shell 1.After user wears smartwatch, guarantee that second electrode P2 and the 4th electrode P4 can be with human body hand
The skin realization of wrist contacts well, to improve detection sensitivity.
As a kind of preferred design of the present embodiment, first electrode P1 and third electrode P3 can be mounted on dial plate
4 opposite sides, and it is respectively adjacent to two sides watchband 2,3, and perpendicular to the extending direction of watchband 2,3；By second electrode P2 and
Four electrode P4 are laid in the back side 5 of Watchcase 1 perpendicular to the extending direction of watchband 2,3 in parallel, and second electrode P2 is adjacent to table
Band 2, the 4th electrode P4 is adjacent to watchband 3.Farther out due to first electrode P1 and the interval third electrode P3, the electricity of second electrode P2 and the 4th
Farther out, it can thus be avoided detection signal interferes with each other, improve detection accuracy in the pole interval P4.
Inside the shell 1 of smartwatch, four metal clips can be set, each electrode passes through a metal clips
With the circuit board communication inside shell 1.The body fat rate measurement module and Electrocardiography module are laid on circuit boards, led to
It crosses metal clips to be connected to electrode P1-P4, to transmit pumping signal and bioelectrical signals.
When carrying out body fat rate measurement, smartwatch is worn in one of wrist of human body, second electrode P2 is made
It is come into full contact with the skin of the 4th electrode P4 and human body wrist；Then, it is pressed with two fingers of another hand in smartwatch
On positive first electrode P1 and third electrode P3, body fat rate measurement module is swashed by first electrode P1 and second electrode P2 transmitting
Signal is encouraged, and bioelectrical signals are acquired by third electrode P3 and the 4th electrode P4, is calculated according to the bioelectrical signals received
Body fat rate data are generated, and user is shown to by the display screen of smartwatch.
When carrying out Electrocardiography, second electrode P2 is connected with the 4th electrode P4 synthesizes an electrode, with human body wrist
Skin come into full contact with.It is pressed with two fingers of a hand for not wearing smartwatch in the positive first electrode of smartwatch
On P1 and third electrode P3, Electrocardiography module acquires bioelectrical signals by four electrode P1-P4, according to the life received
Object electric signal generates electrocardiogram, and is shown to user eventually by the display screen of smartwatch.Second electrode P2 and the 4th electrode
P4 synthesis, increases the contact area of electrode and skin, and the acquisition quality and electrocardiogram for helping to improve bioelectrical signals are surveyed
The accuracy of examination.
In addition, can be with battery, for for each functional module (such as central processing in smartwatch in smartwatch
Device, body fat rate measurement module, Electrocardiography module, analog switch chip U1 and display screen etc.) power supply electricity needed for it is provided
Source.
The electrode multiplex circuit that the present embodiment is used on smartwatch or Intelligent bracelet, not only may be implemented body fat rate
Measurement and Electrocardiography dual function, and be able to ascend the accuracy of body fat rate measurement, improve user to smartwatch or
The usage experience of Intelligent bracelet.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (10)
1. a kind of electrode multiplex circuit for promoting body fat rate accuracy of measurement characterized by comprising
Four electrodes；
Body fat rate measurement module is used to generate body fat rate data according to collected bioelectrical signals, including four electrodes connect
Mouthful, four electrode interfaces directly connect one to one with four electrodes；
Electrocardiography module is used to generate electrocardiogram (ECG) data, including two or three electricity according to collected bioelectrical signals
Pole interface；
Analog switch chip comprising four-way switch channel, and the one end in four-way switch channel respectively with four electrodes
It connects one to one, the other end connects the electrode interface of the Electrocardiography module, and according to Electrocardiography module
The quantity selection of electrode interface the other ends of a portion switching channels is shorted；
Central processing unit outputs enable signal to the enable end of the analog switch chip, to the analog switch chip
The four-way switch channel carries out on-off control.
2. electrode multiplex circuit according to claim 1, which is characterized in that when the electrode of the Electrocardiography module connects
When mouth is three, after the other end of switching channels described in two-way is shorted, it is then connected to the Electrocardiography module
One of electrode interface.
3. electrode multiplex circuit according to claim 1, which is characterized in that when the electrode of the Electrocardiography module connects
When mouth is two, the four-way switch channel is divided into two groups, by the other end in the double switch channel in each group
After short circuit, connect one to one respectively with two electrode interfaces of the Electrocardiography module.
4. electrode multiplex circuit according to any one of claim 1 to 3, which is characterized in that it further include zero resistance, it is described
The other end of switching channels selects to be shorted by zero resistance.
5. electrode multiplex circuit according to any one of claim 1 to 3, which is characterized in that further include the suppression of four tunnel transient states
Diode processed is connected to described four between electrode and ground correspondingly.
6. electrode multiplex circuit according to any one of claim 1 to 3, which is characterized in that
The central processing unit connects the body fat rate measurement module, during controlling switch chip conducting, controls institute
State the closing of body fat rate measurement module；
The analog switch chip is to be less than with the input capacitance after enabled turn-off function and the shutdown of its four-way switch channel
The integrated chip of 20pF.
7. a kind of wearable device, which is characterized in that surveyed including promotion body fat rate such as described in any one of claims 1 to 6
Measure the electrode multiplex circuit of accuracy.
8. wearable device according to claim 7, which is characterized in that the wearable device is smartwatch or intelligence
Bracelet, four electrodes include the positive first electrode and third electrode for being laid in the shell of smartwatch or Intelligent bracelet
And it is laid in the second electrode and the 4th electrode at the back side of the shell, and expose to the shell, the back of the shell
Skin contact of the face when the smartwatch or Intelligent bracelet are worn in the wrist of human body, with wrist.
9. wearable device according to claim 8, which is characterized in that
When the electrode interface of the Electrocardiography module is three, the second electrode and the 4th electrode are shorted；
When the electrode interface of the Electrocardiography module is two, the first electrode and third electrode are shorted, and will
The second electrode and the 4th electrode are shorted.
10. wearable device according to any one of claims 7 to 9, which is characterized in that it further include display screen, connection
The central processing unit shows the body fat rate and electrocardiogram of wearer.
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| CN201721789063.5U CN208659358U (en) | 2017-12-20 | 2017-12-20 | A kind of electrode multiplex circuit and wearable device promoting body fat rate accuracy of measurement |
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| CN201721789063.5U CN208659358U (en) | 2017-12-20 | 2017-12-20 | A kind of electrode multiplex circuit and wearable device promoting body fat rate accuracy of measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107865653A (en) * | 2017-12-20 | 2018-04-03 | 歌尔科技有限公司 | A kind of electrode multiplex circuit and wearable device for lifting body fat rate accuracy of measurement |
| WO2021082182A1 (en) * | 2019-10-29 | 2021-05-06 | 潍坊歌尔微电子有限公司 | Wearable device, and detection method and detection apparatus for human body signs |
-
2017
- 2017-12-20 CN CN201721789063.5U patent/CN208659358U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107865653A (en) * | 2017-12-20 | 2018-04-03 | 歌尔科技有限公司 | A kind of electrode multiplex circuit and wearable device for lifting body fat rate accuracy of measurement |
| CN107865653B (en) * | 2017-12-20 | 2024-04-05 | 歌尔科技有限公司 | Electrode multiplexing circuit for improving body fat rate measurement accuracy and wearable equipment |
| WO2021082182A1 (en) * | 2019-10-29 | 2021-05-06 | 潍坊歌尔微电子有限公司 | Wearable device, and detection method and detection apparatus for human body signs |
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