CN104224143A - Ultralow-power-consumption PPG (Photo Plethysmo Graphy) signal acqusition circuit and acqusition method - Google Patents
Ultralow-power-consumption PPG (Photo Plethysmo Graphy) signal acqusition circuit and acqusition method Download PDFInfo
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- CN104224143A CN104224143A CN201410507181.7A CN201410507181A CN104224143A CN 104224143 A CN104224143 A CN 104224143A CN 201410507181 A CN201410507181 A CN 201410507181A CN 104224143 A CN104224143 A CN 104224143A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000013186 photoplethysmography Methods 0.000 title abstract description 6
- 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
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000011514 reflex Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 101150042711 adc2 gene Proteins 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 4
- 238000005259 measurement Methods 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
- 230000010365 information processing Effects 0.000 abstract 2
- 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
- 238000001914 filtration Methods 0.000 description 2
- 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
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process 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
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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 an ultralow-power-consumption PPG (Photo Plethysmo Graphy) signal acqusition circuit. The circuit comprises a light emission module and a light receiving information processing module, wherein the light emission module comprises a light emitting diode D1 and a resistor R1; the light emitting diode D1 is connected with the resistor R1; the light receiving information processing module comprises a photosensitive diode D2, a D/A (Digital/Analog) converter DAC, a current-to-voltage converter I/V, a G amplifier and an A/D converter ADC1; the D/A converter DAC is connected with the current-to-voltage converter I/V through the resistor R2; the photosensitive diode D2 is connected with the current-to-voltage converter I/V; the current-to-voltage converter I/V is connected with the G amplifier; the G amplifier is connected with the A/D converter ADC1. The invention also discloses a PPG signal acqusition method for the circuit.
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
Photoplethysmographic (Photo Plethysmo Graphy, hereinafter referred to as PPG) is a kind of important physiological signal, applies widely and to unify blood constituent analysis to cardiovascular system.As to being exactly that employing 2 kinds or LED of more than two kinds (light emitting diode) measure PPG and realize in the measurement of blood oxygen saturation.
Based on the wearable device of health monitoring often to PPG information gathering, traditional method is elementary amplification, low-pass filtering, high-pass filtering, automatic growth control, the circuit such as integration control carry out photoplethysmographic and carry out controlling and processing, and cause circuit complicated like this, 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, provide 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.
The object of the invention is to be achieved through the following technical solutions: the PPG signal acquisition circuit of super low-power consumption, it comprises light emission module and light-receiving message processing module, described light emission module comprises light emitting diode D1 and resistance R1, and described light emitting diode D1 is connected with resistance R1; Described light-receiving message processing module comprises light sensitive diode 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 R2, light sensitive diode 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.
It also comprises battery-conserving switch SW1 and battery-conserving switch SW2, light emission module and battery-conserving switch SW1 are connected in electric power loop, 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, SW2 realize opening and shut-off circuit in sampling, reach the object of saving energy.
Described D/A converter DAC is the saturated of the amplifier adjusted in the circuit of signals collecting.
It also comprises an A/D change-over circuit ADC2 for prime sampling, the input of described A/D change-over circuit is connected with the output of current-to-voltage convertor I/V, the output voltage of current-to-voltage convertor I/V is measured, a step can provide DA correction value size after computation, accelerate the correction time.
It also comprises the inverting input of two comparison circuits and comparator C1 and comparator C2, comparator C1, the inverting input of comparator C2 is connected with the output of amplifier G, homophase join dependency voltage compare reference value.Comparator C1 and comparator C2 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, measures, i.e. PPG signal measurement to the output voltage of amplifier, 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 sub-step:
S1: system electrification;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
The optical signal of S3: light sensitive diode D2 reception skin reflex;
The optical signal of light sensitive diode D2 reception skin reflex is converted to the signal of telecommunication by S4: current-to-voltage convertor I/V;
S5: the current-to-voltage convertor I/V signal of telecommunication exported amplifies laggard line number mode convertion through amplifier, exports the value after conversion, i.e. digitized PPG signal sampling.
It also comprises a saturation adjustment step, comparator C1 and comparator C2 makes assessment to whether amplifier G is saturated fast, and do not need ADC1 conversion just can learn that whether amplifier G is saturated, as close to saturation, ADC2 sample rate current electric pressure converter I/V exports, then adjust 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 and exports monitoring step, measures the output voltage of current-to-voltage convertor I/V, calculates D/A converter DA value a step can provide DA correction value size after calculating, accelerates the correction time.
Described utilizing emitted light is pulsed light, and the optical signal that described light sensitive diode D2 receives skin reflex is pulsed optical signals.
The invention has the beneficial effects as follows: the PPG signal acquisition circuit and the acquisition method that the invention provides a kind of super low-power consumption, circuit structure of the present invention is simple, can effectively detect PPG signal, low in energy consumption, applied widely.
Accompanying drawing explanation
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 to the 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 message processing module, and described light emission module comprises light emitting diode D1 and resistance R1, and described light emitting diode D1 is connected with resistance R1; Described light-receiving message processing module comprises light sensitive diode 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 R2, light sensitive diode 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.
It also comprises battery-conserving switch SW1 and battery-conserving switch SW2, light emission module and battery-conserving switch SW1 are connected in electric power loop, 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, SW2 realize opening and shut-off circuit in sampling, reach the object of saving energy.
Described D/A converter DAC is the saturated of the amplifier adjusted in the circuit of signals collecting.
It also comprises an A/D change-over circuit ADC2 for prime sampling, the input of described A/D change-over circuit is connected with the output of current-to-voltage convertor I/V, the output voltage of current-to-voltage convertor I/V is measured, a step can provide DA correction value size after computation, accelerate the correction time.
It also comprises the inverting input of two comparison circuits and comparator C1 and comparator C2, comparator C1, the inverting input of comparator C2 is connected with the output of amplifier G, homophase join dependency voltage compare reference value.Comparator C1 and comparator C2 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, measures, i.e. PPG signal measurement to the output voltage of amplifier, 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 sub-step:
S1: system electrification;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
The optical signal of S3: light sensitive diode D2 reception skin reflex;
The optical signal of light sensitive diode D2 reception skin reflex is converted to the signal of telecommunication by S4: current-to-voltage convertor I/V;
S5: the current-to-voltage convertor I/V signal of telecommunication exported amplifies laggard line number mode convertion through amplifier, exports the value after conversion, i.e. digitized PPG signal sampling.
It also comprises a saturation adjustment step, comparator C1 and comparator C2 makes assessment to whether amplifier G is saturated fast, and do not need ADC1 conversion just can learn that whether amplifier G is saturated, as close to saturation, ADC2 sample rate current electric pressure converter I/V exports, then adjust 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 and exports monitoring step, measures the output voltage of current-to-voltage convertor I/V, calculates D/A converter DA value a step can provide DA correction value size after calculating, accelerates the correction time.
Described utilizing emitted light is pulsed light, and the optical signal that described light sensitive diode D2 receives skin reflex is pulsed optical signals.
In PPG signal acquisition circuit of the present invention, the photoelectric current of light sensitive diode D2 represents this PPG signal, can represent with following formula:
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 constant B with R2, IV.
Claims (10)
1. the PPG signal acquisition circuit of super low-power consumption, is characterized in that: it comprises light emission module and light-receiving message processing module, and described light emission module comprises light emitting diode D1 and resistance R1, and described light emitting diode D1 is connected with resistance R1; Described light-receiving message processing module comprises light sensitive diode 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 R2, light sensitive diode 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.
2. the PPG signal acquisition circuit of super low-power consumption according to claim 1, it is characterized in that: it also comprises battery-conserving switch SW1 and battery-conserving switch SW2, light emission module and battery-conserving switch SW1 are connected in electric power loop, 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, SW2 realize opening and shut-off circuit in sampling, reach 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 converter DAC is the saturated of the amplifier adjusted in the circuit of signals collecting.
4. the PPG signal acquisition circuit of super low-power consumption according to claim 1, it is characterized in that: it also comprises an A/D change-over circuit ADC2 for prime sampling, the input of described A/D change-over circuit is connected with the output of current-to-voltage convertor I/V, the output voltage of current-to-voltage convertor I/V is measured, a step can provide DA correction value size after computation, accelerate the correction time.
5. the PPG signal acquisition circuit of super low-power consumption according to claim 1, it is characterized in that: it also comprises two comparison circuits and comparator C1 and comparator C2, the inverting input of comparator C1, the inverting input of comparator C2 are connected with the output of amplifier G, homophase join dependency voltage compare reference value, comparator C1 and comparator C2 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.
6. the method for the PPG signal acquisition circuit signals collecting of super low-power consumption as claimed in claim 1, it is characterized in that: the input of described A/D change-over circuit ADC1 is connected with the output of G amplifier, the output voltage of amplifier is measured, i.e. PPG signal measurement, so that algorithm calculates.
7. the method for the PPG signal acquisition circuit signals collecting of super low-power consumption as claimed in claim 1, is characterized in that: it comprises following sub-step:
S1: system electrification;
S2: light emitting diode D1 utilizing emitted light irradiates skin;
The optical signal of S3: light sensitive diode D2 reception skin reflex;
The optical signal of light sensitive diode D2 reception skin reflex is converted to the signal of telecommunication by S4: current-to-voltage convertor I/V;
S5: the current-to-voltage convertor I/V signal of telecommunication exported amplifies laggard line number mode convertion through amplifier, exports the value after conversion, i.e. digitized PPG signal sampling.
8. the acquisition method of PPG signal according to claim 7, it is characterized in that: it also comprises a saturation adjustment step, comparator C1 and comparator C2 makes assessment to whether amplifier G is saturated fast, and do not need ADC1 conversion just can learn that whether amplifier G is saturated, as close to saturation, ADC2 sample rate current electric pressure converter I/V exports, and then adjusts the output of D/A converter DA, make amplifier enter amplification region according to its characteristic.
9. the acquisition method of PPG signal according to claim 7, it is characterized in that: it also comprises a current-to-voltage convertor I/V and exports monitoring step, the output voltage of current-to-voltage convertor I/V is measured, calculate D/A converter DA value a step DA correction value size can be provided after calculating, accelerate the correction time.
10. the method for collection PPG signal according to claim 7, it is characterized in that: described utilizing emitted light is pulsed light, the optical signal that described light sensitive diode D2 receives skin reflex is pulsed optical signals 2.
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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| 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 true CN104224143A (en) | 2014-12-24 |
| CN104224143B CN104224143B (en) | 2016-05-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105125183A (en) * | 2015-07-06 | 2015-12-09 | 深圳曼瑞德科技有限公司 | Photoelectric pulse measuring apparatus |
| WO2016045453A1 (en) * | 2014-09-28 | 2016-03-31 | 成都维客亲源健康科技有限公司 | Ultralow power consumption ppg signal acquisition circuit and acquisition method |
| 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 |
| CN108606801A (en) * | 2018-05-18 | 2018-10-02 | 无锡商业职业技术学院 | A kind of multispectral colour of skin calibration of PPG technologies and optimised power consumption device and working method |
| CN111616716A (en) * | 2020-01-09 | 2020-09-04 | 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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| CN108606801A (en) * | 2018-05-18 | 2018-10-02 | 无锡商业职业技术学院 | A kind of multispectral colour of skin calibration of PPG technologies and optimised power consumption device and working method |
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| CN111616716A (en) * | 2020-01-09 | 2020-09-04 | 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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| Publication number | Publication date |
|---|---|
| WO2016045453A1 (en) | 2016-03-31 |
| CN104224143B (en) | 2016-05-04 |
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