CN104257377B - It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection - Google Patents
It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection Download PDFInfo
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- CN104257377B CN104257377B CN201410507213.3A CN201410507213A CN104257377B CN 104257377 B CN104257377 B CN 104257377B CN 201410507213 A CN201410507213 A CN 201410507213A CN 104257377 B CN104257377 B CN 104257377B
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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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Abstract
The invention discloses a kind of super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection and method, it includes pulse signal source P, integrating capacitor C1, sampling capacitance C2, operational amplifier OPA1, band filter, analog switch SW1, analog switch SW2, analog switch SW3, analog-digital converter, MCU and two contact skin ends, analog switch SW2 is connected with integrating capacitor C1, the output of integrating capacitor C1 is connected with sampling capacitance C2 by analog switch SW3, the output of sampling capacitance C2 is connected with the input of operational amplifier OPA1, the outfan of operational amplifier OPA1 is connected with band filter, the output of band filter is by being connected with MCU.The present invention is without inertia noble metal electrode, it is not necessary to smear conductive paste in advance, and perspiring, on measuring not impact, has the advantage that low cost, power consumption are extremely low simultaneously, is suitable for high-performance intelligence wearable device.
Description
Technical field
The present invention relates to a kind of super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection and method.
Background technology
Progress and growth in the living standard along with society, people are more and more higher for healthy demand, traditional it be directed to the ill Health Management Mode seen a doctor and the most do not adapt to people health is needed further exist for, people are more desirable to obtain that beautiful environment, body and mind is comfortable, green harmless, the most accurate, economical convenient, and the novel detection means that can prevent trouble before it happens.
In wearable device based on health detection, rhythm of the heart detection is the most common demand.Resistance volumetric method gathers a kind of common signal acquisition method that capillary network hyperemia situation is rhythm of the heart detection.In traditional measuring method, generally require an inert metal electrode contact skin and measure, be not suitable for wearable device and use.And the present invention is without inertia noble metal electrode, it is not necessary to smear conductive paste in advance, perspiring, on measuring not impact, has the advantage that low cost, power consumption are extremely low simultaneously, is suitable for wearable device.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of without inertia noble metal electrode, without smearing conductive paste, perspiring in advance to measuring not impact, low cost, the super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection being suitable for wearable device and method.
nullIt is an object of the invention to be achieved through the following technical solutions: be suitable for the super low-power consumption electrodeless resistance volumetric measurement circuit of rhythm of the heart detection，It includes pulse signal source P、Integrating capacitor C1、Sampling capacitance C2、Operational amplifier OPA1、Band filter、Analog switch SW1、Analog switch SW2、Analog switch SW3、Analog-digital converter、MCU and two contact skin ends，One of them contact skin end is connected with pulse signal source P，Another contact skin end one end with analog switch SW1 and SW2 respectively is connected，The other end of analog switch SW2 is connected with integrating capacitor C1，The output of integrating capacitor C1 is connected with one end of analog switch SW3，The other end of analog switch SW3 is connected with sampling capacitance C2，The output of sampling capacitance C2 is connected with the in-phase input end of operational amplifier OPA1，The outfan of operational amplifier OPA1 is connected with the reverse input end of operational amplifier OPA1 and the input of band filter respectively，The outfan of band filter is connected with analog-digital converter，The outfan of analog-digital converter is connected with MCU，The other end of analog switch SW1、The other end of integrating capacitor C1 and the other end of sampling capacitance C2 connect over the ground.
The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection also includes that a logic circuit, described logic circuit are connected with the control signal input of analog switch SW1, SW2, SW3, for controlling the opening and closing of analog switch SW1, SW2, SW3.
Described band filter is mainly made up of operational amplifier OPA2, resistance R1, resistance R2, electric capacity C3 and electric capacity C4, the output of operational amplifier OPA1 coupled to the reverse input end of operational amplifier OPA2 through resistance R1, electric capacity C3, and resistance R2, electric capacity C4 parallel connection constitute negative feedback loop.
Described skin equivalent circuit S is made up of an electric capacity and a resistant series.
Described operational amplifier OPA1 and operational amplifier OPA2 is low consumed power operational amplifier.
Described analog switch SW1, SW2 and SW3 is high-speed analog switch.
Being suitable for the method surveyed for heart rate detection of super low-power consumption electrodeless resistance volumetric measurement circuit of rhythm of the heart detection as claimed in claim 1, it includes following sub-step:
Integrating capacitor C1 is discharged under sequencing contro by S1: before detection, high-speed analog switch SW1 and high-speed analog switch SW2；
S2: detection starts, two contact skin end in contact skins, pulse signal source one step signal sequence of output, under the control of logic circuit, high-speed analog switch SW1 and high-speed analog switch SW2 is switched, integrating capacitor C1 adds up electric charge；
S3: under the control of high-speed analog switch SW3, transfers to the electric charge that integrating capacitor C1 is accumulated on sampling capacitance C2；
S4: the voltage of sampling capacitance C2, after operational amplifier OPA1 buffers, is sent in the band filter network of operational amplifier OPA2；
S5: quantify through analog-digital converter again, input to Micro-processor MCV processes.
The opening and closing sequence of high-speed analog switch SW2 is identical with the sequence of the step signal that pulse signal source P exports, the opening and closing sequence frequency of high-speed analog switch SW1 with SW2 is identical, opposite in phase, amplitude are equal and the most overlapping, high-speed analog switch SW3 closes all the time.
The invention has the beneficial effects as follows: the equivalent circuit that contact skin end is formed by the present invention detects that SW1 and SW2 under logic circuit control, is switched, stored charge on C1 integrating condenser by pulse signal source one step signal sequence of output；Under SW3 control, the electric charge of C1 is transferred on C2 sampling capacitance；The voltage of sampling capacitance is sent in the band filter network of OPA2 after OPA1 buffers, then quantifies through digital to analog converter, enters algorithm process.The present invention is without inertia noble metal electrode, it is not necessary to smear conductive paste in advance, and perspiring, on measuring not impact, has the advantage that low cost, power consumption are extremely low simultaneously, is suitable for high-performance intelligence wearable device.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention；
Fig. 2 is the inventive method flow chart；
Fig. 3 is the exemplary waveform diagram of pulse signal source of the present invention and switch.
Detailed description of the invention
nullTechnical scheme is described in further detail below in conjunction with the accompanying drawings: as shown in Figure 1，It is suitable for the super low-power consumption electrodeless resistance volumetric measurement circuit of rhythm of the heart detection，It includes pulse signal source P、Integrating capacitor C1、Sampling capacitance C2、Operational amplifier OPA1、Band filter、Analog switch SW1、Analog switch SW2、Analog switch SW3、Analog-digital converter、MCU and two contact skin ends，One of them contact skin end is connected with pulse signal source P，Another contact skin end one end with analog switch SW1 and SW2 respectively is connected，The other end of analog switch SW2 is connected with integrating capacitor C1，The output of integrating capacitor C1 is connected with one end of analog switch SW3，The other end of analog switch SW3 is connected with sampling capacitance C2，The output of sampling capacitance C2 is connected with the in-phase input end of operational amplifier OPA1，The outfan of operational amplifier OPA1 is connected with the reverse input end of operational amplifier OPA1 and the input of band filter respectively，The outfan of band filter is connected with analog-digital converter，The outfan of analog-digital converter is connected with MCU，The other end of analog switch SW1、The other end of integrating capacitor C1 and the other end of sampling capacitance C2 connect over the ground.
The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection also includes that a logic circuit, described logic circuit are connected with the control signal input of analog switch SW1, SW2, SW3, for controlling the opening and closing of analog switch SW1, SW2, SW3.
Described band filter is mainly made up of operational amplifier OPA2, resistance R1, resistance R2, electric capacity C3 and electric capacity C4, the output of operational amplifier OPA1 coupled to the reverse input end of operational amplifier OPA2 through resistance R1, electric capacity C3, and resistance R2, electric capacity C4 parallel connection constitute negative feedback loop.
Described skin equivalent circuit S is made up of an electric capacity and a resistant series.
Described operational amplifier OPA1 and operational amplifier OPA2 is low consumed power operational amplifier.
Described analog switch SW1, SW2 and SW3 is high-speed analog switch.
As in figure 2 it is shown, be suitable for the method surveyed for heart rate detection of super low-power consumption electrodeless resistance volumetric measurement circuit of rhythm of the heart detection as claimed in claim 1, it is characterised in that: it includes following sub-step:
Integrating capacitor C1 is discharged under sequencing contro by S1: before detection, high-speed analog switch SW1 and high-speed analog switch SW2；
S2: detection starts, two contact skin end in contact skins, pulse signal source one step signal sequence of output, under the control of logic circuit, high-speed analog switch SW1 and high-speed analog switch SW2 is switched, integrating capacitor C1 adds up electric charge；
S3: under the control of high-speed analog switch SW3, transfers to the electric charge that integrating capacitor C1 is accumulated on sampling capacitance C2；
S4: the voltage of sampling capacitance C2, after operational amplifier OPA1 buffers, is sent in the band filter network of operational amplifier OPA2；
S5: quantify through analog-digital converter again, input to Micro-processor MCV processes.
The step signal sequence of pulse signal source output, the opening and closing waveform relationship figure of high-speed analog switch SW1, high-speed analog switch SW2 and high-speed analog switch SW3 is as shown in Figure 3, the opening and closing sequence of high-speed analog switch SW2 is identical with the sequence of the step signal that pulse signal source P exports, the opening and closing sequence frequency of high-speed analog switch SW1 with SW2 is identical, opposite in phase, amplitude are equal and the most overlapping, high-speed analog switch SW3 closes all the time.
Claims (6)
- null1. it is suitable for the super low-power consumption electrodeless resistance volumetric measurement circuit of rhythm of the heart detection，It is characterized in that: it includes pulse signal source P、Integrating capacitor C1、Sampling capacitance C2、Operational amplifier OPA1、Band filter、Analog switch SW1、Analog switch SW2、Analog switch SW3、Analog-digital converter、MCU and two contact skin ends，One of them contact skin end is connected with pulse signal source P，Another contact skin end one end with analog switch SW1 and SW2 respectively is connected，The other end of analog switch SW2 is connected with integrating capacitor C1，The output of integrating capacitor C1 is connected with one end of analog switch SW3，The other end of analog switch SW3 is connected with sampling capacitance C2，The output of sampling capacitance C2 is connected with the in-phase input end of operational amplifier OPA1，The outfan of operational amplifier OPA1 is connected with the reverse input end of operational amplifier OPA1 and the input of band filter respectively，The outfan of band filter is connected with analog-digital converter，The outfan of analog-digital converter is connected with MCU，The other end of analog switch SW1、The other end of integrating capacitor C1 and the other end of sampling capacitance C2 connect over the ground；The skin equivalent circuit S formed between two contact skin ends is made up of an electric capacity and a resistant series.
- The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection the most according to claim 1, it is characterized in that: also include a logic circuit, described logic circuit is connected with the control signal input of analog switch SW1, SW2, SW3, for controlling the opening and closing of analog switch SW1, SW2, SW3.
- The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection the most according to claim 1, it is characterized in that: described band filter is mainly made up of operational amplifier OPA2, resistance R1, resistance R2, electric capacity C3 and electric capacity C4, the output of operational amplifier OPA1 coupled to the reverse input end of operational amplifier OPA2 through resistance R1, electric capacity C3, and resistance R2, electric capacity C4 parallel connection constitute negative feedback loop.
- The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection the most according to claim 3, it is characterised in that: described operational amplifier OPA1 and operational amplifier OPA2 is low consumed power operational amplifier.
- The super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection the most according to claim 1, it is characterised in that: described analog switch SW1, SW2 and SW3 is high-speed analog switch.
- 6. the measuring method of super low-power consumption electrodeless resistance volumetric measurement circuit being suitable for rhythm of the heart detection as described in any one in claim 1 ~ 5, it is characterised in that: it includes following sub-step:Integrating capacitor C1 is discharged under sequencing contro by S1: before detection, analog switch SW1 and analog switch SW2；S2: detection starts, two contact skin end in contact skins, pulse signal source one step signal sequence of output, under the control of logic circuit, analog switch SW1 and analog switch SW2 is switched, integrating capacitor C1 adds up electric charge；S3: under the control of analog switch SW3, transfers to the electric charge that integrating capacitor C1 is accumulated on sampling capacitance C2；S4: the voltage of sampling capacitance C2, after operational amplifier OPA1 buffers, is sent in the band filter network of operational amplifier OPA2；S5: quantify through analog-digital converter again, input to Micro-processor MCV processes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410507213.3A CN104257377B (en) | 2014-09-28 | 2014-09-28 | It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection |
| PCT/CN2015/086183 WO2016045456A1 (en) | 2014-09-28 | 2015-08-05 | Ultra-low power consumption electrodeless capacitor volume measurement circuit and method applicable in heart rate monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410507213.3A CN104257377B (en) | 2014-09-28 | 2014-09-28 | It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection |
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| CN104257377A CN104257377A (en) | 2015-01-07 |
| CN104257377B true CN104257377B (en) | 2016-08-24 |
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| CN201410507213.3A Active CN104257377B (en) | 2014-09-28 | 2014-09-28 | It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104257377B (en) * | 2014-09-28 | 2016-08-24 | 成都维客亲源健康科技有限公司 | It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection |
| CN113098517B (en) * | 2021-03-04 | 2023-10-20 | 北京大学 | Event triggering type analog-to-digital converter and medical electronic equipment |
| CN114285398B (en) * | 2022-03-04 | 2022-05-27 | 南京沁恒微电子股份有限公司 | Capacitive charging type touch key detection circuit and detection method |
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| GB2113847A (en) * | 1981-12-17 | 1983-08-10 | Seiko Instr & Electronics | A heart-beat rate indicator |
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| CN104622452A (en) * | 2013-11-13 | 2015-05-20 | 成都闰世科技有限公司 | Low-power-consumption pulse tester |
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| WO1986003114A1 (en) * | 1984-11-27 | 1986-06-05 | University Of North Carolina At Chapel Hill | Portable automated blood pressure monitoring apparatus and method |
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| US20050203348A1 (en) * | 2004-03-01 | 2005-09-15 | Musa Shihadeh | Remote cardiac arrest monitor |
| CN100407993C (en) * | 2006-09-05 | 2008-08-06 | 西安交通大学 | Digital signal process method for light- frequency conversion type pulse blood oxygen instrument |
| CN102300499B (en) * | 2010-05-07 | 2014-05-28 | 杨章民 | Method and system for generating physiological signals with fabric capacitive sensors |
| CN102648845A (en) * | 2011-02-23 | 2012-08-29 | 深圳市迈迪加科技发展有限公司 | Automatic wireless monitoring and early-warning system for heartbeat and breath in sleep |
| CN102973261B (en) * | 2011-09-02 | 2014-05-14 | 中国科学院电子学研究所 | Capacity coupling type electric field sensor used for dynamic electrocardiogram monitoring |
| US20130338460A1 (en) * | 2012-06-18 | 2013-12-19 | David Da He | Wearable Device for Continuous Cardiac Monitoring |
| CN103385711B (en) * | 2013-08-02 | 2015-01-14 | 临沂市拓普网络股份有限公司 | MEMS -based human body physiological parameter detection device |
| CN104257377B (en) * | 2014-09-28 | 2016-08-24 | 成都维客亲源健康科技有限公司 | It is suitable for super low-power consumption electrodeless resistance volumetric measurement circuit and the method for rhythm of the heart detection |
-
2014
- 2014-09-28 CN CN201410507213.3A patent/CN104257377B/en active Active
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2015
- 2015-08-05 WO PCT/CN2015/086183 patent/WO2016045456A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA991276A (en) * | 1972-04-05 | 1976-06-15 | N.V. Philips Gloeilampenfabrieken | Stroke volume meter |
| GB2113847A (en) * | 1981-12-17 | 1983-08-10 | Seiko Instr & Electronics | A heart-beat rate indicator |
| US5097837A (en) * | 1988-09-17 | 1992-03-24 | Hewlett-Packard Company | Synchronous demodulator |
| CN104622452A (en) * | 2013-11-13 | 2015-05-20 | 成都闰世科技有限公司 | Low-power-consumption pulse tester |
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| Publication number | Publication date |
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| CN104257377A (en) | 2015-01-07 |
| WO2016045456A1 (en) | 2016-03-31 |
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