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WO2016045456A1 - Circuit de détection à volume de résistance sans électrode à faible consommation se prêtant à la détection de la fréquence cardiaque et procédé associé - Google Patents

Circuit de détection à volume de résistance sans électrode à faible consommation se prêtant à la détection de la fréquence cardiaque et procédé associé Download PDF

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Publication number
WO2016045456A1
WO2016045456A1 PCT/CN2015/086183 CN2015086183W WO2016045456A1 WO 2016045456 A1 WO2016045456 A1 WO 2016045456A1 CN 2015086183 W CN2015086183 W CN 2015086183W WO 2016045456 A1 WO2016045456 A1 WO 2016045456A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitor
analog switch
operational amplifier
analog
low power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/086183
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English (en)
Chinese (zh)
Inventor
崔予红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Vcare Qinyuan Health Technology Co Ltd
Original Assignee
Chengdu Vcare Qinyuan Health Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Vcare Qinyuan Health Technology Co Ltd filed Critical Chengdu Vcare Qinyuan Health Technology Co Ltd
Publication of WO2016045456A1 publication Critical patent/WO2016045456A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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 for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • A61B5/0245—Measuring pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals

Definitions

  • the present invention relates to an ultra low power electrodeless resistance volume measuring circuit and method suitable for heart rate detection.
  • heart rate detection is a very common requirement.
  • Resistive volumetric acquisition of capillary network congestion is a common method of signal acquisition for heart rate detection.
  • an inert metal electrode is often required to contact the skin for measurement, which is not suitable for wearable devices.
  • the invention does not need an inert precious metal electrode, and does not need to apply a conductive paste in advance, and the sweating of the human body has no influence on the measurement, and has the advantages of low cost and extremely low power consumption, and is suitable for a wearable device.
  • the object of the present invention is to overcome the deficiencies of the prior art, and to provide a heart rhythm detection that does not require an inert precious metal electrode, does not require prior application of a conductive paste, has no effect on the measurement of sweating of the human body, is low in cost, and is suitable for a wearable device. Ultra-low power electrodeless resistance volume measurement circuit and method.
  • an ultra-low power electrodeless resistance volume measuring circuit suitable for heart rate detection which includes a pulse signal source P, an integrating capacitor C1, a sampling capacitor C2, an operational amplifier ⁇ 1 , bandpass filter, analog switch SW1, analog switch SW2, analog switch SW3, analog to digital converter, MCU and two skin contact terminals, one of the skin contact ends is connected to the pulse signal source P, and the other skin contact
  • the terminals are respectively connected to one ends of the analog switches SW1 and SW2, and the other one of the SW2 switches is simulated.
  • the terminal is connected to the integrating capacitor CI, the output of the integrating capacitor CI is connected to one end of the analog switch SW3, the other end of the analog switch SW3 is connected to the sampling capacitor C2, and the output of the sampling capacitor C2 is connected with the non-inverting input terminal of the operational amplifier OPA1,
  • the output of the amplifier OPA1 is respectively connected to the inverting input of the operational amplifier OPA1 and the input of the band pass filter, the output of the band pass filter is connected to the analog to digital converter, and the output of the analog to digital converter is connected to the MCU.
  • the other end of the analog switch SW1, the other end of the integrating capacitor C1, and the other end of the sampling capacitor C2 are connected to the ground.
  • An ultra-low power electrodeless resistance volume measuring circuit suitable for heart rate detection further includes a logic circuit connected to a control signal input terminal of the analog switches SW1, SW2, and SW3 for controlling the analog port. Turn off the closing of SW1, SW2, and SW3.
  • the band pass filter is mainly composed of an operational amplifier OPA2, a resistor R1, a resistor R2, a capacitor C3 and a capacitor C4.
  • the output of the operational amplifier OPA1 is coupled to the inverting input terminal of the operational amplifier OPA2 via a resistor R1 and a capacitor C3.
  • the resistor R2 and the capacitor C4 are connected in parallel to form a negative feedback loop.
  • the skin equivalent circuit S is composed of a capacitor and a resistor in series.
  • the operational amplifier OPA1 and the operational amplifier OPA2 are low power operational amplifiers.
  • the analog switches SW1, SW2 and SW3 are high-speed analog switches.
  • the ultra low power consumption electrodeless resistance volume measuring circuit suitable for heart rate detection according to claim 1 is used for a heart rate detection method, which comprises the following substeps:
  • S2 At the beginning of the detection, the two skin contact ends contact the skin, and the pulse signal source outputs a step signal sequence, and the high-speed analog switch SW1 and the high-speed analog switch SW2 are controlled under the control of the logic circuit, and the integral is performed.
  • Capacitor C1 accumulates charge
  • S4 The voltage of the sampling capacitor C2 is buffered by the operational amplifier OPA1, and then sent to the bandpass filter network of the operational amplifier OPA2;
  • S5 It is quantized by an analog-to-digital converter and input to the microprocessor MCU for processing.
  • the sequence of the high-speed analog switch SW2 is the same as the sequence of the step signal output by the pulse signal source P, high
  • the speed simulation SW1 and SW2 have the same closed sequence frequency, opposite phase, equal amplitude and no overlap, and the high-speed analog switch SW3 is always closed.
  • the beneficial effects of the present invention are:
  • the invention detects the equivalent circuit formed on the skin contact end, and the pulse signal source outputs a step signal sequence, and under the control of the logic circuit, the SW1 and the SW2 are clamped, and the C1 integral is performed.
  • the charge is accumulated on the capacitor; under the control of SW3, the charge of C1 is transferred to the C2 sampling capacitor; the voltage of the sampling capacitor is buffered by OPA1 and sent to the bandpass filter network of OPA2, and then quantized by the digital-to-analog converter.
  • Algorithm processing Algorithm processing.
  • the invention does not need an inert precious metal electrode, and does not need to be coated with a conductive paste in advance, and the sweating of the human body has no influence on the measurement, and has the advantages of low cost and low power consumption, and is suitable for high-performance smart wearable devices.
  • FIG. 3 is a typical waveform diagram of a pulse signal source and a gate according to the present invention.
  • an ultra-low power electrodeless resistance volume measuring circuit suitable for heart rate detection which includes a pulse signal source P, an integrating capacitor Cl, and a sampling Capacitor C2, Operational Amplifier ⁇ 1, Bandpass Filter, Analog Shutdown SW1, Analog Shutdown SW2, Analog Shutdown SW3, Analog to Digital Converter, MCU and Two Skin Contact Ends, One Skin Contact and Pulse Signal Source P Connected, the other skin contact end is connected to one end of the analog switch SW1 and SW2 respectively, and the other end of the analog switch SW2 is connected with the integral capacitor C1, and the output of the integral capacitor C1 is connected with one end of the analog switch SW3, and the analog SW3 is connected.
  • the other end is connected to the sampling capacitor C2.
  • the output of the sampling capacitor C2 is connected to the non-inverting input of the operational amplifier OPA1.
  • the output of the operational amplifier OPA1 is respectively connected to the inverting input of the operational amplifier OPA 1 and the input of the band pass filter. , the output of the bandpass filter and the modulus The converter is connected, the output of the analog-to-digital converter is connected to the MCU, the other end of the analog switch SW1, the other end of the integrating capacitor C1 and the other end of the sampling capacitor C2 are connected to the ground.
  • the ultra-low power electrodeless resistance volume measuring circuit suitable for heart rate detection further comprises a logic circuit, and the logic circuit is connected with the control signal input ends of the analog switches SW1, SW2 and SW3 for controlling the simulation. Turn off the closing of SW1, SW2, and SW3.
  • the band pass filter is mainly composed of an operational amplifier OPA2, a resistor R1, a resistor R2, a capacitor C3 and a capacitor C4.
  • the output of the operational amplifier OPA1 is coupled to the inverting input terminal of the operational amplifier OPA2 via a resistor R1 and a capacitor C3.
  • the resistor R2 and the capacitor C4 are connected in parallel to form a negative feedback loop.
  • the skin equivalent circuit S is composed of a capacitor and a resistor in series.
  • the operational amplifier OPA1 and the operational amplifier OPA2 are low power operational amplifiers.
  • the analog switches SW1, SW2 and SW3 are high speed analog switches.
  • the ultra low power consumption electrodeless resistance volume measuring circuit suitable for heart rate detection according to claim 1 is used for heart rate detection and measurement, characterized in that it comprises the following substeps:
  • S2 When the detection starts, the two skin contact ends contact the skin, and the pulse signal source outputs a step signal sequence, and the high-speed analog switch SW1 and the high-speed analog switch SW2 are controlled under the control of the logic circuit, and the integral is performed. Capacitor C1 accumulates charge;
  • S4 The voltage of the sampling capacitor C2 is buffered by the operational amplifier OPA1, and then sent to the bandpass filter network of the operational amplifier OPA2;
  • S5 It is quantized by an analog-to-digital converter and input to the microprocessor MCU for processing.
  • the step signal sequence of the pulse signal source output, the high-speed analog switch SW1, the high-speed analog switch SW2, and the high-speed analog switch SW3 are shown in FIG. 3, and the high-speed analog switch SW2 is closed.
  • the sequence is the same as the sequence of the step signal output from the pulse signal source P.
  • the high-speed analog switches SW1 and SW2 have the same closed sequence frequency, opposite phase, equal amplitude and no overlap, and the high-speed analog switch SW3 is always closed.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Cardiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Physiology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Signal Processing (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)

Abstract

L'invention concerne un circuit de détection à volume de résistance sans électrode à faible consommation se prêtant à la détection de la fréquence cardiaque et procédé associé, lequel circuit de détection comprend une source de signal pulsé (P), un condensateur d'intégration (C1), un condensateur d'échantillonnage (C2), un amplificateur opérationnel (OPA1), un filtre passe-bande, un commutateur analogique (SW1), un commutateur analogique (SW2), un commutateur analogique (SW3), un convertisseur analogique-numérique, un microcontrôleur et deux extrémités de contact avec la peau, ledit commutateur analogique (SW2) étant relié audit condensateur d'intégration (C1) dont la sortie est reliée moyennant ledit commutateur analogique (SW3) audit condensateur d'échantillonnage (C2), dont la sortie est reliée à la sortie dudit amplificateur opérationnel (OPA1), dont la sortie est reliée audit filtre passe-bande, dont la sortie est relié avec ledit microcontrôleur. Il n'y alors plus besoin de faire appel à des électrodes inertes de métal noble, ni besoin d'appliquer au préalable une pâte conductrice. Par ailleurs, la transpiration n'a pas d'impact sur les mesures. Autres avantages : moindres coûts de fabrication et faible consommation d'énergie. L'invention est parfaitement indiquée pour une utilisation sur des dispositifs portables intelligents de très haut niveau.
PCT/CN2015/086183 2014-09-28 2015-08-05 Circuit de détection à volume de résistance sans électrode à faible consommation se prêtant à la détection de la fréquence cardiaque et procédé associé Ceased WO2016045456A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410507213.3 2014-09-28
CN201410507213.3A CN104257377B (zh) 2014-09-28 2014-09-28 适合于心律检测的超低功耗无电极电阻容积测量电路与方法

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WO2016045456A1 true WO2016045456A1 (fr) 2016-03-31

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CN (1) CN104257377B (fr)
WO (1) WO2016045456A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113098517A (zh) * 2021-03-04 2021-07-09 北京大学 一种事件触发型模数转换器和一种医疗电子设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104257377B (zh) * 2014-09-28 2016-08-24 成都维客亲源健康科技有限公司 适合于心律检测的超低功耗无电极电阻容积测量电路与方法
CN114285398B (zh) * 2022-03-04 2022-05-27 南京沁恒微电子股份有限公司 一种电容充电型触摸按键检测电路及检测方法

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US20130338460A1 (en) * 2012-06-18 2013-12-19 David Da He Wearable Device for Continuous Cardiac Monitoring
CN104257377A (zh) * 2014-09-28 2015-01-07 成都金海鼎盛科技有限公司 适合于心律检测的超低功耗无电极电阻容积测量电路与方法

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WO1986003114A1 (fr) * 1984-11-27 1986-06-05 University Of North Carolina At Chapel Hill Procede et appareil portatif et automatique de controle de la pression sanguine
CN1502298A (zh) * 2002-11-25 2004-06-09 三洋电机株式会社 心搏和呼吸测量装置
US20050203348A1 (en) * 2004-03-01 2005-09-15 Musa Shihadeh Remote cardiac arrest monitor
CN1915167A (zh) * 2006-09-05 2007-02-21 西安交通大学 一种光－频率转换式脉搏血氧仪的数字信号处理方法
CN102300499A (zh) * 2010-05-07 2011-12-28 杨章民 利用布料电容传感器来产生生理信号的方法及系统
CN102648845A (zh) * 2011-02-23 2012-08-29 深圳市迈迪加科技发展有限公司 一种睡眠中心跳、呼吸无线自动监测与预警系统
CN102973261A (zh) * 2011-09-02 2013-03-20 中国科学院电子学研究所 一种用于动态心电监测的电容耦合式电场传感器
US20130338460A1 (en) * 2012-06-18 2013-12-19 David Da He Wearable Device for Continuous Cardiac Monitoring
CN103385711A (zh) * 2013-08-02 2013-11-13 临沂市拓普网络股份有限公司 基于mems的人体生理参数检测装置
CN104257377A (zh) * 2014-09-28 2015-01-07 成都金海鼎盛科技有限公司 适合于心律检测的超低功耗无电极电阻容积测量电路与方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113098517A (zh) * 2021-03-04 2021-07-09 北京大学 一种事件触发型模数转换器和一种医疗电子设备
CN113098517B (zh) * 2021-03-04 2023-10-20 北京大学 一种事件触发型模数转换器和一种医疗电子设备

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CN104257377A (zh) 2015-01-07

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