CN104224143B - PPG signal acquisition circuit and the acquisition method of super low-power consumption - Google Patents
PPG signal acquisition circuit and the acquisition method of super low-power consumption Download PDFInfo
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- CN104224143B CN104224143B CN201410507181.7A CN201410507181A CN104224143B CN 104224143 B CN104224143 B CN 104224143B CN 201410507181 A CN201410507181 A CN 201410507181A CN 104224143 B CN104224143 B CN 104224143B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 claims abstract description 17
- 101150102866 adc1 gene Proteins 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000011514 reflex Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 101150042711 adc2 gene Proteins 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000010365 information processing Effects 0.000 claims 1
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 101100001672 Emericella variicolor andG gene Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000748 cardiovascular system Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000013186 photoplethysmography Methods 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—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
- A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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Abstract
The invention discloses a kind of PPG signal acquisition circuit of super low-power consumption, it comprises light emission module and light-receiving message processing module, and described light emission module comprises light emitting diode D1 and resistance R 1, and described light emitting diode D1 is connected with resistance R 1; Described light-receiving message processing module comprises photodiode D2, D/A converter DAC, current-to-voltage convertor I/V, G amplifier and A/D converter ADC1, described D/A converter DAC is connected with current-to-voltage convertor I/V by resistance R 2, photodiode D2 is connected with current-to-voltage convertor I/V, current-to-voltage convertor I/V is connected with G amplifier, and G amplifier is connected with A/D converter ADC1. The invention also discloses the method that this circuit carries out PPG signals collecting.
Description
Technical field
The present invention relates to a kind of PPG signal acquisition circuit and acquisition method of super low-power consumption.
Background technology
Photoelectricity volume pulsation wave (PhotoPlethysmoGraphy, hereinafter to be referred as PPG) is a kind of important physiology letterNumber, apply widely the cardiovascular system blood constituent analysis of unifying. As to being exactly to adopt 2 kinds in the measurement of blood oxygen saturationOr LED of more than two kinds (light emitting diode) measurement PPG realizes.
Wearable device based on health monitoring is often to PPG information gathering, and conventional method is elementary amplification, low pass filteredRipple, high-pass filtering, automatic gain control, the circuit such as integration control carry out photoelectricity volume pulsation wave to be controlled and processes, like thisCause circuit complexity, reliability is low, the high deficiency of power consumption.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of PPG signal acquisition circuit of super low-power consumption is providedAnd acquisition method, circuit structure of the present invention is simple, can effectively detect PPG signal, low in energy consumption, applied widely.
The object of the invention is to be achieved through the following technical solutions: the PPG signal acquisition circuit of super low-power consumption, its bagDraw together light emission module and light-receiving message processing module, described light emission module comprises light emitting diode D1 and resistance R 1, instituteThe light emitting diode D1 stating is connected with resistance R 1; Described light-receiving message processing module comprises photodiode D2, D/A conversionDevice DAC, current-to-voltage convertor I/V, G amplifier and A/D converter ADC1, described D/A converter DAC by resistance R 2 withCurrent-to-voltage convertor I/V connect, photodiode D2 is connected with current-to-voltage convertor I/V, current-to-voltage convertor I/V andG amplifier connects, and G amplifier is connected with A/D converter ADC1.
It also comprises battery-conserving switch SW1 and battery-conserving switch SW2, and light emission module and battery-conserving switch SW1 are connected on power supply and returnLu Zhong, battery-conserving switch SW2 is connected in the electric power loop of current-to-voltage convertor I/V and amplifier G, battery-conserving switch SW1, SW2In sampling, realize and opening and shut-off circuit, reach the object of saving energy.
Described D/A converter DAC is adjust amplifier in the circuit of signals collecting saturated.
It also comprises an A/D change-over circuit ADC2 for prime sampling, the input of described A/D change-over circuit and electricityThe output of stream electric pressure converter I/V connects, and the output voltage of current-to-voltage convertor I/V is measured, can after calculatingOne step provides DA correction value size, accelerates the correction time.
It also comprises that two comparison circuits are comparator C 1 and comparator C 2, the inverting input of comparator C 1, comparatorThe inverting input of C2 is connected with the output of amplifier G, homophase join dependency voltage comparison reference. Comparator C 1 and comparatorC2 can make assessment to whether amplifier G is saturated fast, and does not need ADC1 conversion just can learn that whether amplifier G is saturated.
The input of described A/D change-over circuit ADC1 is connected with the output of G amplifier, and the output voltage of amplifier is carried outMeasure, i.e. PPG signal measurement, so that algorithm calculates.
The method of the PPG signal acquisition circuit signals collecting of super low-power consumption as claimed in claim 1, it comprises following sonStep:
S1: system powers on;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
S3: photodiode D2 receives the optical signal of skin reflex;
S4: the optical signal that photodiode D2 is received skin reflex by current-to-voltage convertor I/V is converted to the signal of telecommunication;
S5: the signal of telecommunication of current-to-voltage convertor I/V output amplifies laggard row digital-to-analogue conversion through amplifier, after output conversionValue, i.e. digitlization PPG signal sampling.
It also comprises a saturation adjustment step, and comparator C 1 and comparator C 2 are made whether amplifier G is saturated fastAssessment, and do not need ADC1 conversion just can learn that whether amplifier G is saturated, as approach saturation state, ADC2 sample rate current voltageConverter I/V output, adjusts the output of D/A converter DA according to its characteristic, make amplifier enter amplification region.
It also comprises a current-to-voltage convertor I/V output monitoring step, to the output electricity of current-to-voltage convertor I/VCompress into row and measure, calculate D/A converter DA value to can a step provide DA correction value size after calculating, while accelerating to reviseBetween.
Described utilizing emitted light is pulsed light, and the optical signal that described photodiode D2 receives skin reflex is pulsed lightSignal.
The invention has the beneficial effects as follows: the invention provides a kind of PPG signal acquisition circuit and acquisition method of super low-power consumption,Circuit structure of the present invention is simple, can effectively detect PPG signal, low in energy consumption, applied widely.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram;
Fig. 2 is signal acquisition method flow chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited toThe following stated.
As shown in Figure 1, the PPG signal acquisition circuit of super low-power consumption, it comprises light emission module and light-receiving information processingModule, described light emission module comprises light emitting diode D1 and resistance R 1, described light emitting diode D1 is connected with resistance R 1;Described light-receiving message processing module comprises that photodiode D2, D/A converter DAC, current-to-voltage convertor I/V, G amplifyDevice and A/D converter ADC1, described D/A converter DAC is connected with current-to-voltage convertor I/V by resistance R 2, and photosensitive twoUtmost point pipe D2 is connected with current-to-voltage convertor I/V, and current-to-voltage convertor I/V is connected with G amplifier, and G amplifier and A/D turnParallel operation ADC1 connects.
It also comprises battery-conserving switch SW1 and battery-conserving switch SW2, and light emission module and battery-conserving switch SW1 are connected on power supply and returnLu Zhong, battery-conserving switch SW2 is connected in the electric power loop of current-to-voltage convertor I/V and amplifier G, battery-conserving switch SW1, SW2In sampling, realize and opening and shut-off circuit, reach the object of saving energy.
Described D/A converter DAC is adjust amplifier in the circuit of signals collecting saturated.
It also comprises an A/D change-over circuit ADC2 for prime sampling, the input of described A/D change-over circuit and electricityThe output of stream electric pressure converter I/V connects, and the output voltage of current-to-voltage convertor I/V is measured, can after calculatingOne step provides DA correction value size, accelerates the correction time.
It also comprises that two comparison circuits are comparator C 1 and comparator C 2, the inverting input of comparator C 1, comparatorThe inverting input of C2 is connected with the output of amplifier G, homophase join dependency voltage comparison reference. Comparator C 1 and comparatorC2 can make assessment to whether amplifier G is saturated fast, and does not need ADC1 conversion just can learn that whether amplifier G is saturated.
The input of described A/D change-over circuit ADC1 is connected with the output of G amplifier, and the output voltage of amplifier is carried outMeasure, i.e. PPG signal measurement, so that algorithm calculates.
The method of the PPG signal acquisition circuit signals collecting of super low-power consumption as claimed in claim 1, it comprises following sonStep:
S1: system powers on;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
S3: photodiode D2 receives the optical signal of skin reflex;
S4: the optical signal that photodiode D2 is received skin reflex by current-to-voltage convertor I/V is converted to the signal of telecommunication;
S5: the signal of telecommunication of current-to-voltage convertor I/V output amplifies laggard row digital-to-analogue conversion through amplifier, after output conversionValue, i.e. digitlization PPG signal sampling.
It also comprises a saturation adjustment step, and comparator C 1 and comparator C 2 are made whether amplifier G is saturated fastAssessment, and do not need ADC1 conversion just can learn that whether amplifier G is saturated, as approach saturation state, ADC2 sample rate current voltageConverter I/V output, adjusts the output of D/A converter DA according to its characteristic, make amplifier enter amplification region.
It also comprises a current-to-voltage convertor I/V output monitoring step, to the output electricity of current-to-voltage convertor I/VCompress into row and measure, calculate D/A converter DA value to can a step provide DA correction value size after calculating, while accelerating to reviseBetween.
Described utilizing emitted light is pulsed light, and the optical signal that described photodiode D2 receives skin reflex is pulsed lightSignal.
In PPG signal acquisition circuit of the present invention, the photoelectric current of photodiode D2 represents this PPG signal, can use following formulaRepresent:
Photoelectric current=D/A output valve * constant A+A/D conversion value * constant B
Wherein constant A is relevant across resistance, G amplifier gain with R2, IV with constant B.
Claims (8)
1. the PPG signal acquisition circuit of super low-power consumption, is characterized in that: it comprises light emission module and light-receiving information processing mouldPiece, described light emission module comprises light emitting diode D1 and resistance R 1, described light emitting diode D1 is connected with resistance R 1; InstituteThe light-receiving message processing module of stating comprises photodiode D2, D/A converter DAC, current-to-voltage convertor I/V, G amplifierWith A/D converter ADC1, described D/A converter DAC is connected with current-to-voltage convertor I/V by resistance R 2, photosensitive two utmost pointsPipe D2 is connected with current-to-voltage convertor I/V, and current-to-voltage convertor I/V is connected with G amplifier, G amplifier and A/D conversionDevice ADC1 connects, and Acquisition Circuit also comprises an A/D change-over circuit ADC2 for prime sampling, described A/D change-over circuitInput be connected with the output of current-to-voltage convertor I/V, the output voltage of current-to-voltage convertor I/V is measured,After calculating, can a step provide DA correction value size, accelerate the correction time.
2. the PPG signal acquisition circuit of super low-power consumption according to claim 1, is characterized in that: it also comprises economizing on electricity opensClose SW1 and battery-conserving switch SW2, light emission module and battery-conserving switch SW1 are connected in electric power loop, and battery-conserving switch SW2 is connected onIn the electric power loop of current-to-voltage convertor I/V and amplifier G, battery-conserving switch SW1, SW2 realize and open and close electricity in samplingRoad, reaches the object of saving energy.
3. the PPG signal acquisition circuit of super low-power consumption according to claim 1, is characterized in that: described D/A converterDAC is adjust amplifier in the circuit of signals collecting saturated.
4. the PPG signal acquisition circuit of super low-power consumption according to claim 1, is characterized in that: it also comprises two ratiosBe comparator C 1 and comparator C 2 compared with circuit, the inverting input of comparator C 1, the inverting input of comparator C 2 and amplifier GOutput connect, homophase join dependency voltage comparison reference, comparator C 1 and comparator C 2 can be fast to amplifier G whetherSaturatedly make assessment, and do not need ADC1 conversion just can learn that whether amplifier G is saturated.
5. the PPG signal acquisition circuit of super low-power consumption according to claim 1, is characterized in that: described A/D conversion electricityThe input of road ADC1 is connected with the output of G amplifier, the output voltage of amplifier measured, i.e. and PPG signal measurement, so thatAlgorithm calculates.
6. the method for the PPG signal acquisition circuit signals collecting of super low-power consumption as claimed in claim 1, is characterized in that: itComprise following sub-step:
S1: system powers on;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
S3: photodiode D2 receives the optical signal of skin reflex;
S4: the optical signal that photodiode D2 is received skin reflex by current-to-voltage convertor I/V is converted to the signal of telecommunication;
S5: the signal of telecommunication of current-to-voltage convertor I/V output amplifies laggard row digital-to-analogue conversion through amplifier, after output conversionValue, i.e. digitlization PPG signal sampling;
It also comprises a current-to-voltage convertor I/V output monitoring step, and the output voltage of current-to-voltage convertor I/V is enteredRow is measured, and calculates D/A converter DA value to can a step provide DA correction value size after calculating, and accelerates the correction time.
7. the method for the PPG signal acquisition circuit signals collecting of super low-power consumption according to claim 6, is characterized in that:It also comprises a saturation adjustment step, and comparator C 1 and comparator C 2 are made assessment to whether amplifier G is saturated fast, and notNeed ADC1 conversion just can learn that whether amplifier G is saturated, as approach saturation state, ADC2 sample rate current electric pressure converter I/VOutput, adjusts the output of D/A converter DA according to its characteristic, make amplifier enter amplification region.
8. the method for the PPG signal acquisition circuit signals collecting of super low-power consumption according to claim 6, is characterized in that:Described utilizing emitted light is pulsed light, and the optical signal that described photodiode D2 receives skin reflex is pulsed optical signals.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410507181.7A CN104224143B (en) | 2014-09-28 | 2014-09-28 | PPG signal acquisition circuit and the acquisition method of super low-power consumption |
| PCT/CN2015/086180 WO2016045453A1 (en) | 2014-09-28 | 2015-08-05 | Ultralow power consumption ppg signal acquisition circuit and acquisition method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410507181.7A CN104224143B (en) | 2014-09-28 | 2014-09-28 | PPG signal acquisition circuit and the acquisition method of super low-power consumption |
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| CN104224143A CN104224143A (en) | 2014-12-24 |
| CN104224143B true CN104224143B (en) | 2016-05-04 |
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| CN104224143B (en) * | 2014-09-28 | 2016-05-04 | 成都金海鼎盛科技有限公司 | PPG signal acquisition circuit and the acquisition method of super low-power consumption |
| CN105125183A (en) * | 2015-07-06 | 2015-12-09 | 深圳曼瑞德科技有限公司 | Photoelectric pulse measuring apparatus |
| CN105943015A (en) * | 2016-06-04 | 2016-09-21 | 浙江大学 | Wearable heart rate variability (HRV) monitoring device with active noise reduction function |
| CN105943014A (en) * | 2016-06-04 | 2016-09-21 | 浙江大学 | SoC-based wearable heart rate variability monitoring device |
| CN108606801B (en) * | 2018-05-18 | 2021-03-05 | 无锡商业职业技术学院 | PPG technology multispectral skin color calibration and power consumption optimization device and working method |
| CN111616716B (en) * | 2020-01-09 | 2023-10-20 | 成都维客昕微电子有限公司 | Step frequency measuring device and method based on multi-wavelength light source combination |
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| SE465551B (en) * | 1990-02-16 | 1991-09-30 | Aake Oeberg | DEVICE FOR DETERMINING A HEART AND RESPIRATORY FREQUENCY THROUGH PHOTOPLETISMOGRAPHICAL SEATING |
| JP3676924B2 (en) * | 1998-04-06 | 2005-07-27 | タツモ株式会社 | Light beam sensor |
| JP3208538B2 (en) * | 1998-11-10 | 2001-09-17 | 山越 憲一 | Photoplethysmograph |
| WO2001017421A1 (en) * | 1999-09-08 | 2001-03-15 | Optoq Ab | Method and apparatus for combined measurement of hemoglobin and oxygen saturation |
| JP2004274337A (en) * | 2003-03-07 | 2004-09-30 | Mitsubishi Electric Corp | Optical receiver |
| CN1297232C (en) * | 2004-05-21 | 2007-01-31 | 天津大学 | Optical-circuit-variable airspace light-dividing differencial wavelength spectometer for detecting tissue content and detection method thereof |
| CN1672628A (en) * | 2005-04-29 | 2005-09-28 | 天津大学 | Dynamic spectrometry instrument with multiple wavelength LED |
| CN101034006A (en) * | 2007-03-13 | 2007-09-12 | 郑晓明 | Method for improving measurement precision of photometry measuring instrument |
| CN201260671Y (en) * | 2008-10-10 | 2009-06-24 | 华南理工大学 | Wireless blood oxygen monitoring finger stall based on ZigBee |
| CN102141631A (en) * | 2010-12-30 | 2011-08-03 | 中国科学院等离子体物理研究所 | High-sensitivity and wideband hydrogen or deuterium alpha spectrum line intensity measurement method and system |
| CN102319075B (en) * | 2011-08-17 | 2014-07-09 | 天津大学 | Blood oxygen saturation measuring device and measuring method |
| CN102440774A (en) * | 2011-09-01 | 2012-05-09 | 东南大学 | Remote measurement module for related physiological information in rehabilitation training process |
| US9044149B2 (en) * | 2012-06-22 | 2015-06-02 | Fitbit, Inc. | Heart rate data collection |
| CN202714854U (en) * | 2012-08-02 | 2013-02-06 | 深圳市邦健电子有限公司 | Photoelectric detection circuit, blood oxygen probe and monitor |
| WO2014088768A2 (en) * | 2012-12-04 | 2014-06-12 | Brain Tree Analytics Llc | Multi purpose electrode |
| CN104224143B (en) * | 2014-09-28 | 2016-05-04 | 成都金海鼎盛科技有限公司 | PPG signal acquisition circuit and the acquisition method of super low-power consumption |
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| WO2016045453A1 (en) | 2016-03-31 |
| CN104224143A (en) | 2014-12-24 |
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