CN108055720A - Biosensor circuit and intelligent wearable device - Google Patents
Biosensor circuit and intelligent wearable device Download PDFInfo
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- CN108055720A CN108055720A CN201711217900.1A CN201711217900A CN108055720A CN 108055720 A CN108055720 A CN 108055720A CN 201711217900 A CN201711217900 A CN 201711217900A CN 108055720 A CN108055720 A CN 108055720A
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- 230000006641 stabilisation Effects 0.000 claims abstract description 27
- 238000011105 stabilization Methods 0.000 claims abstract description 27
- 239000011324 bead Substances 0.000 claims description 30
- 230000005669 field effect Effects 0.000 claims description 3
- 230000003760 hair shine Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000035479 physiological effects, processes and functions Effects 0.000 abstract description 5
- 239000008280 blood Substances 0.000 description 24
- 210000004369 blood Anatomy 0.000 description 24
- 230000008859 change Effects 0.000 description 9
- 230000005611 electricity Effects 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 5
- 230000003862 health status Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000036772 blood pressure Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000005631 quantum field theories Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14542—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring blood gases
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Surgery (AREA)
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- Pathology (AREA)
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- Medical Informatics (AREA)
- Molecular Biology (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Optics & Photonics (AREA)
- Vascular Medicine (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Pulmonology (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention belongs to power electronics fields, provide a kind of biosensor circuit and intelligent wearable device, and the circuit includes：Light emitting diode, for emitting light particle；Photoelectric converter, the photoelectric converter include photosensitive receiving tube and light-to-current inversion module, wherein the photosensitive receiving tube is used to receive reflected light particle；Current stabilization module, the first end of the current stabilization module connect the cathode of the light emitting diode, and the anode of the light emitting diode connects DC power supply；Current control module is connected between second end and the ground of the current stabilization module, and the current control module flows through the electric current stabilization of the light emitting diode for controlling.Existing biosensor circuit can be effectively solved by the present invention to be difficult to provide stable constant current, cause the measurement to Human Physiology index that there is larger error and the biosensor circuit to have the problem of compared with low signal-to-noise ratio.
Description
Technical field
The invention belongs to power electronics field more particularly to a kind of biosensor circuits and intelligent wearable device.
Background technology
With the raising that people realize own health, intelligent wearable device has been more and more widely used,.At present,
Intelligent wearable device obtains every physical signs of acquisition human body, such as blood pressure, blood oxygen, pulse by biosensor circuit
Deng.Existing biosensor circuit mainly utilizes the electricity characteristic of light-sensitive device, and intensity of illumination has with running current size
There is functional relation, and blood of human body can absorb a small amount of light particle in certain condition, be measured by biosensor circuit
The situation of blood of human body and then the health status for judging human body.
Therefore, existing biosensor circuit has the following problems：The prior art provides constant current for light-sensitive device
When, impulse sampling mode is employed, causes the running current in light-sensitive device that there is larger fluctuation, makes light-sensitive device that can not carry
For stable intensity of illumination, the error of measurement is larger；And the intensity of illumination of light-sensitive device is easily excessively high in the prior art, causes
Blood of human body absorbs light particle and supersaturation occurs, and human body can not be precisely measured out so as to cause biosensor circuit
Physical signs, signal-to-noise ratio are relatively low.
The content of the invention
The present invention provides a kind of biosensor circuit and intelligent wearable device, it is intended to solve bio-sensing in the prior art
Device circuit has very low signal-to-noise ratio, has the problem of large error to the physical signs measurement of human body.
First aspect present invention, provides a kind of biosensor circuit, and the circuit includes：
Light emitting diode, for emitting light particle；
Photoelectric converter, the photoelectric converter include photosensitive receiving tube and light-to-current inversion module, photosensitive are connect wherein described
Closed tube is used to receive reflected light particle；
Current stabilization module, the first end of the current stabilization module connect the cathode of the light emitting diode, the light emitting diode
Anode connect DC power supply；
Current control module is connected between second end and the ground of the current stabilization module, and the current control module is used for
The electric current that control flows through the light emitting diode is stablized.
Further, the current stabilization module is resistor.
Further, the resistance value of the resistor and the optical wavelength of the light emitting diode match.
Further, the current control module includes：The electricity being connected between the second end of the current stabilization module and ground
Sub switch device and the main control chip being connected with the electronic switching device；
Wherein, the Master control chip is used to send default high-frequency pulse signal, the electricity to the electronic switching device
Sub switch device break-make under the default high-frequency pulse signal control.
Further, the frequency of the default high-frequency pulse signal is in the range of 100kHz to 200kHz.
Further, the light bead quantum count that the width of the default high-frequency pulse signal is emitted with the light emitting diode
Match.
Further, electronic switching device is N-channel field-effect tube or NPN triode.
Further, the LED operation is in unsaturated state.
Further, the light emitting diode is single color LED.
Second aspect of the present invention, provides a kind of intelligent wearable device, and the equipment includes circuit as previously described.
The existing compared with prior art advantageous effect of the present invention is：It is gone here and there between light emitting diode and current control module
A current stabilization module is connect, current control module can provide extremely stable constant current source for light emitting diode, and then should
Light emitting diode is capable of providing constant light source, so as to improve the signal-to-noise ratio of biosensor circuit, reduces through the life
Object sensor circuit detects the error of human body items physical signs；So as to efficiently solve existing biosensor circuit tool
The problem of having compared with low signal-to-noise ratio, Human Physiology index can not be detected exactly.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the circuit structure diagram for the biosensor circuit that first embodiment of the invention provides；
Fig. 2 is the composition structure chart of current control module provided in an embodiment of the present invention；
Fig. 3 is the light bead that the light bead quantum count that light emitting diode provided in an embodiment of the present invention is sent is absorbed with blood of human body
The relational graph of quantum count；
Fig. 4 is the structure chart of intelligent wearable device provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
With reference to attached drawing 1- attached drawings 4, the circuit knot of biosensor circuit provided in an embodiment of the present invention is wherein figure 1 illustrated
Composition, for convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As shown in Figure 1, the biosensor circuit 401 includes：Light emitting diode 101, photoelectric converter 102, current stabilization mould
Block 103 and current control module 104.Wherein light emitting diode 101 is used to emit light particle；Photoelectric converter 102 includes photosensitive
Reception pipe 1021 and light-to-current inversion module 1022, the light particle that the photosensitive receiving tube 1021 is reflected back for reception；Its
Middle photoelectric converter 102 can also be divided into：1) light-frequency converter, 2) light-electric pressure converter；Light-the frequency converter
Light bead quantum count is converted into the square-wave pulse electric signal of certain frequency, the light-electric pressure converter converts light bead quantum count
For the voltage of certain numerical value；The cathode of the first end connecting luminous diode 101 of current stabilization module 103, the sun of light emitting diode 101
Pole meets DC power supply+Vcc；Current control module 104 is connected between the second end of current stabilization module 103 and ground GND, current control
Module 104 is constant for controlling the electric current for flowing through light emitting diode 101.
Specifically, the light-to-current inversion module 1022 is used to convert optical signals to electric signal, light-to-current inversion module 102
The light particle variable quantity received according to photosensitive receiving tube 1021 obtains the variable quantity of corresponding electric signal, further, when described
The light bead quantum count that photosensitive receiving tube 1021 is received changes, then light-to-current inversion module 102 exports the frequency of electric signal
Or voltage can also occur accordingly to change, therefore can 1021 institute of photosensitive receiving tube be monitored in real time by light-to-current inversion module 102
Receive the variable quantity of light particle.
It should be noted that as shown in Figure 1, photosensitive receiving tube 1021 is as a kind of light-sensitive element of uniqueness, photosensitive reception
The anode of pipe 1021 connects cathode, and the cathode of photosensitive receiving tube 1021 connects anode, so as to which photosensitive receiving tube 1021 can will be according to light
Change the electricity characteristic of itself according to the variation of intensity.
It should be noted that light particle is a kind of elementary particle for transferring electromagnetic interaction, according to quantum field theory,
In microcosmos, light has corpuscular property and fluctuation, i.e., " duality principle ", since light has the double attribute of ripple and particle,
Show as quality, momentum, energy under certain condition, due to substance atom all have it is discrete, in discontinuous energy
State, wherein ground state energy are minimum, most stable, due to outside cause be in higher-energy state be derived from it is unstable, slightly by
Ground state is returned to disturbance, realizes the transition of atom, extra energy is converted into light particle and releases, and as shines existing
As.
Human skin refers to tissue of the body surface bag outside muscle, is hidden under human skin and exists in capillary
The blood of flowing, when light emitting diode 101 emits light particle to human skin, then the blood in capillary receives light bead
Son, due to the special chemical constituent of blood of human body, blood is absorbed by part light particle, and remaining unabsorbable light
Particle reflexes to the external world again by human skin, so as to be received by photosensitive receiving tube 1021.Photosensitive receiving tube 1021 continuously receives
The light particle variable quantity that photosensitive receiving tube 1021 is received can be converted into electricity by light particle by light-to-current inversion module 1022
The variation of Human Physiology index will be presented in signal frequency variable quantity, the signal frequency variable quantity in real time.
Optionally, current stabilization module 103 is resistor, and variable resistance may be employed in resistor, can by current stabilization module 103
So that voltage signal is converted to current signal, so as to which light emitting diode 101 is driven to work.
Specifically, the resistance value of resistor and the optical wavelength of light emitting diode 101 match；Pass through the resistance value of regulating resistor
The running current size in light emitting diode 101 can be changed, so that it is guaranteed that the optical wavelength of light emitting diode 101 meets human body blood
The preferable a certain range of liquid absorptivity；If the resistance value increase of resistor is reduced, it can all make the operation electricity in light emitting diode 101
Stream changes, and makes the optical wavelength off-target absorbing wavelength of light emitting diode 101.
Preferably, light emitting diode 101 is single color LED, and light emitting diode 101 is used as light-sensitive element, when passing through
When running current in light emitting diode 101 changes, the light bead quantum count that light emitting diode 101 emits will become
Change；The single color LED can both send visible ray, can also send black light, since single color LED is sent
Optical wavelength is more stable, higher, the light bead wavelet length of transmitting and the size of running current have accurate functional relation, pass through life
Object sensor circuit 401, which measures Human Physiology index, has higher accuracy, reduces the survey caused by external disturbance factor
Measure error.
Specifically, with reference to Fig. 1, when the biosensor circuit 401 is in running order, DC power supply+Vcc output electricity
Can, current control module 104 makes the both end voltage of current stabilization module 103 constant, passes through the running current of light emitting diode 101 at this time
In steady state, light particle constant number that light emitting diode 101 is emitted, such as 101 transmitting per second of light emitting diode
Light bead quantum count is 10000, and the light bead quantum count of the blood absorption per second under human skin is 10, then human skin will
Remaining 9990 light particles reflex to photosensitive receiving tube 1021, if the biosensor circuit 401 is always in work shape
State, since the running current in light emitting diode 101 is constant, then the quantity for the light particle that photosensitive receiving tube 1021 is received is always
For 9990, correspondingly, when human heart pumps out blood or draining blood, the blood volume in capillary under skin will be presented
Regularity mechanical periodicity, in this cycle time the meeting for the light bead quantum count that human body is absorbed change, if blood of human body
The light particle of absorption per second will increase to 20, then the quantity for the light particle that photosensitive receiving tube 1021 is received is 9980, this
When, respective change can also occur for the electric signal detected by light-to-current inversion module 1022；It therefore can be by photosensitive receiving tube
The 1021 light particle variable quantities received are corresponding and the composite computing of electric signal that converts, more accurately reflect human body life
Manage index variable quantity.
It should be noted that above-mentioned Human Physiology index includes the blood pressure of human body, blood oxygen, pulse (heart rate) measurement, in reality
In the life of border, these physical signs are all the basis for estimation as human health status.
It is steady by concatenating one between light emitting diode 101 and current control module 104 by the embodiment of the present invention
Flow module 103, so that the running current in light emitting diode 101 is constant, i.e., the light bead sent by the light emitting diode 101
The constant number of son can monitor the health status of human body in real time, to human body by the light particle that photosensitive receiving tube 1021 receives
Every physical signs measurement have high accuracy；Pass through biosensor circuit so as to effectively overcome the prior art
With larger error and there is the problem of Arctic ice area to the measurement of human body items physical signs.
Fig. 2 shows the composition structure chart of current control module 104, as shown in Fig. 2, current control module 104 includes：It is main
Control chip 1041 and electronic switching device 1042, electronic switching device 1042 are connected between second end and the ground of current stabilization module,
Main control chip 1041 is connected with electronic switching device 1042；Wherein, Master control chip 1041 is used for electronic switching device 1042
Send default high-frequency pulse signal, the break-make under the control of default high-frequency pulse signal of electronic switching device 1042, by adjusting
The pulse width of default high-frequency pulse signal is stated, the light bead quantum count that light emitting diode 101 is emitted is made to obtain therewith accordingly
It adjusts and disclosure satisfy that different skin speciality to meet the biosensor circuit 401, the difference of the different colours of skin is to intensity of illumination
Different requirements.
Specifically, the frequency general recommendations of default high-frequency pulse signal is in the range of 100kHz to 200kHz, but it is unlimited
In this；Wherein kHz is the unit of frequency：KHz.
Specifically, the light bead quantum count that the width of default high-frequency pulse signal is emitted with light emitting diode 101 matches；
By the width for adjusting default high-frequency pulse signal the luminous intensity of light emitting diode 101 is made to be in compared with photosensitive receiving tube 1021
Unsaturated state, optionally, if the frequency of default high-frequency pulse signal is 100kHz, the width of default high-frequency pulse signal accounts for
The scope of empty ratio is 8%-35%；If the frequency higher of default high-frequency pulse signal, can correspondingly reduce default high-frequency impulse
The width of signal；The width duty cycle of i.e. default high-frequency pulse signal is bigger, then the light bead subnumber that light emitting diode 101 is emitted
Amount is also more.
Optionally, electronic switching device 1042 can be N-channel field-effect tube or NPN triode, and but it is not limited to this.
Specifically, with reference to Fig. 1-2, Master control chip 1041 controls electronic switch by sending default high-frequency pulse signal
The conducting of device 1042 and turn-off time since this presets high-frequency pulse signal with specific frequency and width, pass through adjusting
The frequency and width of the default high-frequency pulse signal are the output current size of controllable current control module 104；Further,
The default high-frequency pulse signal that Master control chip 1041 is sent is square wave, when the amplitude of default high-frequency pulse signal is more than threshold values
When, electronic switching device 1042 exports low level, and electronic switching device 1042 turns at this time；High-frequency pulse signal is preset when adjusting
Frequency and width, according to Basis Theory of Circuitry, the conducting electric current of light emitting diode 101 will be maintained at a more constant scope,
So as to ensure the constant of the stabilization of its emission wavelength and intensity of illumination.
Specifically, light emitting diode 101 is operated in unsaturated state, the wherein unsaturated state is light emitting diode 101
The light bead quantum count n sent0The light bead quantum count n absorbed with blood of human body1With linear relationship, as shown in figure 4, Fig. 4 is shown
The relational graph for the light bead quantum count that the light bead quantum count that light emitting diode 101 is sent is absorbed with blood of human body；In 0~n3Rank
Section, as the light bead quantum count n that light emitting diode 101 is sent3During increase, the light bead quantum count n of blood of human body absorption1It also can be with
It is linearly increasing, i.e., in 0~n3In stage, light emitting diode 101 is operated in unsaturated state, within this stage, by photosensitive
The light particle variable quantity that reception pipe 1021 is received can reflect the situation of change of human body items physical signs exactly；With hair
The light bead quantum count n that optical diode 101 is sent0It is continuously increased, when the light particle that light emitting diode 101 emits increases to n3, human body
The light bead quantum count of blood absorption increases to n2, the light bead quantum count n of blood of human body absorption at this time2It has been maximum, if light-emitting diodes
The light particle n that pipe 101 emits0Continue to increase, the light bead quantum count change that blood of human body absorbs is not further added by, and remains at n2, i.e.,
As the light particle n that light emitting diode 101 emits0More than n3When, as the light particle n that light emitting diode 101 emits0With blood of human body
The light particle n of absorption1No longer there is linear relationship, as the light particle n that light emitting diode 101 emits0More than n3When, light-emitting diodes
Pipe 101 is operated in saturation state, which refers to：The light bead quantum count that blood of human body is absorbed and light emitting diode 101
The light particle of transmitting is no longer scaling up；At this point, the light particle variable quantity that can not be just received by photosensitive receiving tube 1021
The variable quantity of human body items physical signs is detected, there is greatly measurement error.
The running current of light emitting diode 101 is specifically controlled by current control module 104, makes light emitting diode 101
Running current be consistently lower than extreme point, ensure that light emitting diode 101 is operated in unsaturated state；On the one hand the biology is reduced
The electric energy loss of sensor circuit 401, and measurement accuracy is improved, reduce error.
Show that the biosensor circuit 401 to human body items physical signs measuring principle and process, is led to by Fig. 1-Fig. 3
Cross that current stabilization module 103 is connected between light emitting diode 101 and current control module 104 on the one hand can be by the electricity in circuit
Pressure signal is converted to constant current signal, so as to drive light emitting diode 101；On the other hand, since the constant current signal is real
It is the average value of the AC signal in circuit on border, when the constant current is by light emitting diode 101, certainly exists one and build
Vertical current balance type dynamical feedback process, current stabilization module 103 can reduce fluctuating range of the AC signal during transient change,
So that there is higher stability, accuracy by the running current in light emitting diode 101.
By the embodiment of the present invention, current stabilization module is concatenated between current control module and light emitting diode, makes luminous two
Running current in pole pipe is kept constant, and light emitting diode can emit stable light bead quantum count, improve biosensor
The signal-to-noise ratio of circuit；Meanwhile by controlling the running current in light emitting diode, make LED operation in unsaturation shape
State reduces the measurement error of biosensor circuit, reduces the electric energy loss of biosensor circuit at work；So as to
Every physical signs of human body can not accurately be measured and with relatively low by effectively overcoming existing biosensor circuit
The shortcoming of signal-to-noise ratio.
Fig. 4 shows the structure chart of intelligent wearable device provided in an embodiment of the present invention, as shown in figure 4, intelligence wearing is set
Standby 40 include biosensor circuit 401.
From the embodiment of the present invention as can be seen that the light bead received by the photosensitive receiving tube in the biosensor circuit
Quantum count can detect the situation of change of the physical signs such as human pulse, and process is simple, of low cost, the biosensor
Circuit can be applied in different users, and current stabilization module improves the stability of constant current in light emitting diode, reduces
The biosensor circuit is for the measurement error of the physical signs such as human pulse；So as to efficiently solve in the prior art,
Biosensor circuit can not generally be applicable in various types user and have the problem of compared with high detection error.
It should be noted that herein, the relational terms of such as first end and second end or the like are just to by one
A entity and another entity distinguish, and without necessarily requiring or implying between these entities, there are any this actual
Relation or order.And term " comprising ", "comprising" or any other variant are intended to non-exclusive inclusion, so as to
So that article or equipment including a series of elements not only include those elements, but also its including being not explicitly listed
It his element or further includes as these articles or the intrinsic element of equipment.In the absence of more restrictions, by language
The element that sentence " including ... " limits, it is not excluded that also there are other identical elements in the article including element or equipment.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of biosensor circuit, which is characterized in that the circuit includes：
Light emitting diode, for emitting light particle；
Photoelectric converter, the photoelectric converter includes photosensitive receiving tube and light-to-current inversion module, wherein the photosensitive receiving tube
For receiving reflected light particle；
Current stabilization module, the first end of the current stabilization module connect the cathode of the light emitting diode, the sun of the light emitting diode
Pole connects DC power supply；
Current control module is connected between second end and the ground of the current stabilization module, and the current control module is used to control
The electric current for flowing through the light emitting diode is stablized.
2. circuit according to claim 1, which is characterized in that the current stabilization module is resistor.
3. circuit according to claim 2, which is characterized in that the resistance value of the resistor and the light of the light emitting diode
Wavelength matches.
4. circuit according to claim 1, which is characterized in that the current control module includes：It is connected to the current stabilization
Electronic switching device between the second end and ground of module and the main control chip being connected with the electronic switching device；
Wherein, the Master control chip is used to send default high-frequency pulse signal, the electronic cutting to the electronic switching device
Close device break-make under the default high-frequency pulse signal control.
5. circuit according to claim 4, which is characterized in that the frequency of the default high-frequency pulse signal in 100kHz extremely
In the range of 200kHz.
6. circuit according to claim 4, which is characterized in that the width of the default high-frequency pulse signal shines with described
The light bead quantum count that diode is emitted matches.
7. circuit according to claim 4, which is characterized in that electronic switching device is N-channel field-effect tube or NPN tri-
Pole pipe.
8. circuit according to any one of claims 1 to 7, which is characterized in that the LED operation is in unsaturation
State.
9. circuit according to claim 8, which is characterized in that the light emitting diode is single color LED.
10. a kind of intelligent wearable device, which is characterized in that including the circuit as any one of claim 1-9.
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