CN104516387A - Constant flow source supply circuit of respiration signal sensor based on air cushion bed - Google Patents
Constant flow source supply circuit of respiration signal sensor based on air cushion bed Download PDFInfo
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Abstract
The invention discloses a constant flow source supply circuit of a respiration signal sensor based on an air cushion bed. The respiration signal is collected by a sensor, and the structure of the sensor is a Wheatstone bridge structure consisting of four P-type resistors. A semiconductor film is installed in the P-type resistor; the +IN input terminal of the sensor is connected with the output terminal of an operational amplifier; the in-phase input terminal of the operational amplifier is connected with one terminal of a resistor R1, the cathode of a voltage-regulator diode D1 and the -IN input terminal of the sensor at the same time, the other terminal of the resistor R1 is connected to the supply voltage; the inverted input terminal of the operational amplifier is connected to the grounding voltage by a resistor R2; and the anode of the voltage-regulator diode D1 is connected with one terminal of a capacitor C1 and the grounding voltage, and the other terminal of the capacitor C1 is connected to the ground. While the constant flow source is used for supplying the power, the output voltage of the sensor is not affected by the temperature, the sensor precision and the like, the number of the instruments is reduced, the cost is reduced, and the stability of the sensor output is higher.
Description
Technical field
The present invention relates to a kind of constant current source power supply circuit, particularly relate to a kind of constant current source power supply circuit of the breath signal sensor based on air bed.
Background technology
Sleep apnea syndrome (Sleep Apnea Syndrome:SAS) is human life and healthy potential killer
[1].Apneic sleep-disorder is there is in SAS in a kind of sleep.According to R & K handbook
[1], the respiratory disorder in sleep quality can be divided into two kinds
[2]: 1. apnea (Apnea): the air-flow of mouth or nose stops flowing beyond ten seconds; 2. low breathing (Hypopnea): ventilation volume lower than 50% time more than ten seconds.Medically, " apnea/low spiro-index " (Apnea-hypopnea Index, AHI) definition refers to the number of times of apnea and low respiration case in average a hour.Adult, generally AHI is diagnosed as higher than 5 and suffers from sleep apnea; Children, diagnosis numerical value does not have verdict, has people that AHI is defined as children sleeping apnea higher than 1.5
[3].Apnea syndrome generally can be divided into following 3 types: obstructive sleep apnea (OSA), and CA (CSA) and mixed type sleep suspend (MSA)
[3].Wherein OSA patient is the most general, accounts for the ratio of 84%.The key distinction of OSA and CSA is that whether respiratory tract is unobstructed.
The clinical manifestation of adult's apnea is that the sound of snoring is huge; The sound of snoring is interrupted because of apnea often, then occurs breathing; Daytime sleepiness, in the daytime focus, cognitive ability declines; Early morning has a headache; Body weight increase etc.Children occur have snoring, Breathiness when apnea shows as nighttime sleep extremely; Have daytime active and drowsiness
[4].These symptoms are more common, are also therefore easily left in the basket.In fact, statistical data shows, and the incidence of disease of external sleep apnea syndrome is 2% to 4%, and the chances are about 3% to 4% for the statistics of China, and have the trend improved year by year
[5], apnea syndrome is the most general at middle-aged male; The incidence of disease of the male sex is about 2 to 8 times of women.
The wherein apnea syndrome of premature, because premature's incidence of disease is high, resistibility is more weak, harm is serious, particularly concerned.Because the maincenter respiratory system of premature grows imperfection, be different from adult, it regulates breathe limited in one's ability, easily occurs respiratory disorder, therefore this colony to suffer from the likelihood ratio general groups of apnea syndrome much higher.According to clinical statistics, the premature of about 40 ~ 50% has the symptom appearance of Cheyne-Stokes; Cheyne-Stokes are one of adnormal respiration, show as accelerated breathing and strengthen weakening the alternately appearance of slowing down.Because the ability that premature breathes from main regulation is weak, suffers from the premature of Cheyne-Stokes and about have half to develop into apnea.And the premature that gestational age is less, body function gets over imperfection, and the probability suffering from apnea syndrome is larger
[6].In addition the factor such as anoxic, Temperature changing, hypoglycemia may cause neonatal apnea syndrome equally.Apnea is a kind of serious physiological barrier for neonate.When finding that apnea appears in neonate, need to implement to breathe to it as early as possible to help and other urgent measure, the normal work of the body that sustains life.As do not processed in time, anoxic can cause brain damage, muscular atrophy etc. over a long time, to neonatal health and intellectual development unfavorable, even cause death by suffocation time serious
[7].
The apnea of adult and children is not paid close attention to widely, although it does not have the fatal rate of the disease such as cancer, pulmonary tuberculosis high, it all has obvious harm to patient individual and society, as shown in Figure 1.It not only affects patient individual and has a rest, and causes individual tired out in the daytime; And the body function of each internal organs of sleep procedure medium-term and long-term anoxic grievous injury body
[8], such as, can cause heart blood supply scarce capacity, blood pressure increases, uncomfortable in chestly to breathe hard, dizzy, endocrinopathy and myasthenia etc., even die suddenly time serious.For the elderly, apnea may cause or increase the weight of some angiocardiopathy; For children, apnea may cause that its growth is delayed, physique is thin and weak; The growth of fetus may be affected for pregnant woman's apnea; In addition, apnea usually bothers the sleep of people around, makes troubles to family and society.
Resident more and more payes attention to concept of health in recent years, and the theory of home health care (Home Health Care-HHC) is rooted in the hearts of the people gradually, and resident gets more and more to the investment of health.Home health care has become one of important directions of medical science development, is also the important symbol of progress of social civilization simultaneously
[9].Domestic monitoring instrument is the pith of home health care.Sleep monitor instrument shows huge market potential.Many flourishing states release domestic sleeping monitor, and take on a certain scale.The domestic sleeping monitoring market of China also grows gradually.Compared with Special Medical monitor, domestic monitoring instrument focuses on low cost, the feature such as easy to operate, noiseless and portable more, and table 1 is the Typical Representative of several domestic sleeping monitor in the market
[10].
Table 1 is domestic and international typical household sleep monitor instrument at present
Sensor in monitor, as the coupling link of human body and Medical Instruments, accurately detects these physical quantity variation, and is converted into electric signal.And by signal processing technology, by the breath signal feature extraction of wherein containing out, thus reflect the breath state of human body.
Breath signal belongs to the faint physiological signal of human body, in the body environment being in human body and surrounding environment complicated and changeable, has following characteristics
[11]:
(1) signal is weak, noise is strong.The vibration amplitude of the breathing of human body is very little, and pressure transducer collects electric signal amplitude also very little (mV rank).Owing to adopting mattress formula detection means and piezoresistive pressure sensor, the initial gas pressure reduction of air bed, stand up action, sleeping posture adjustment etc. and all can be detected by sensor; These jam-to-signal breath signal amplitudes are much bigger.Therefore breath signal belongs to the feeble signal under strong noise background.The feature that breath signal amplitude is low, noise is strong, requires on the one hand to adopt differential pressure measurement, reduces common-mode signal interference, outstanding difference mode signal; Also require on the other hand to select high precision, highly sensitive sensor.
(2) frequency is very low.The respiratory rate of human body is general very low, normally between 0.1Hz ~ 0.6Hz; Human body respiration energy is very concentrated under normal circumstances.
(3) regular and non-regularity.Breath signal has regularity and non-regularity.The regularity of breath signal refers to that the respiratory waveform of same person under equivalent environment, state, frequency, amplitude are more stable; Generally can not there is change more greatly or sharply.The non-regularity of breath signal refers between Different Individual, under different detection means, under different conditions, and the amplitude of breath signal, frequency and waveform all can have larger difference.The non-regularity of breath signal brings difficulty to a certain extent the process of breath signal.
(4) be subject to ectocine and change.Breath signal is in the environment of human body body and around, and breath signal is unavoidably subject to mixing of multiple undesired signal, as shown in Figure 2, affects extraction and the process of breath signal.Except above-mentioned stands up except action, stance adjustment etc., noise is also introduced in heartbeat, muscle beat (frequency is at below 1.5Hz) etc. that human body body produces, will consider that the various interference (as mattress vibrations etc.) of surrounding environment and sensor and signal processing circuit thereof are usually subject to the Hz noise of 50Hz and electronic component self-noise etc. in addition.For different interference, need to take different noise reduction measures.
List of references:
[1] Huang Renhan, Zhao Xueyan, Rong Qiguo; The Progress in Research of Biomechanical Properties [J] of sleep apnea syndrome, Proceedings of Mechanics, 2010,40 (3): 298-308.
[2]Rechtschaffen A,Kales A.A manual of standardized terminology,techniques and scoringsystem for sleep stages of human subjects[J].1968。
[3] Wang Yu, Zhang Ying, Wang Hailing etc.; Obstruction sleep apnea-hypopnea syndrome Analysis of Clinical Risk Factors [J], Chinese clinician's magazine, (electronic edition) 2009,3 (3): 18-21.
[4] Cai Xiaolan, Liu Hongying, Fan Xianliang etc.; The syndromic diagnosis of pediatric obstructive sleep apnea low [J], Chinese hals,Nasen und Ohrenheilkunde magazine, 2003,38 (3): 161-165.
[5] Luo Xianfang, king can still, Cai Yingyun; The dialectical of sleep apnea syndrome and treatment [J] are stated in examination, Zhejiang Journal of Traditional Chinese Medicine, 2003,38 (11): 490-491.
[6] Yang Lianfang, Wu Lijuan; The apnea of prematurity incidence of disease and analysis of Influential Factors [J], Zhejiang preventive medicine, 2007,19 (11): 47-47.
[7] Wei Lili; Apnea of prematurity therapeutic advance [J], foreign medical science: paediatrics fascicle, 2001,28 (1): 51-51.
[8] Li Jia, Wu Shuicai, Li Yanzheng etc.; The progress [J] of Domestic health mornitor, medical equipment information, 2007,22 (3): 55-58.
[9] Chen Feiming; Portable neonate's physiological signal monitoring system design [D], Harbin Institute of Technology, 2012.
[10] kind book is put down, Jiang Shisen; Sleep apnea and multisystem organ injury progress [J], Chinese tuberculosis and breathing magazine, 1997,20 (1): 39-41.
[11] Zhou Jie; Processing of biomedical signals method general introduction [J], brilliant work, 2012,8:285.
Summary of the invention
For the total Problems existing of prior art, consider the features such as sensor output signal bandwidth sum amplitude, in order to sensor does not affect by temperature, sensor accuracy etc., the stability that sensor is exported is higher, reduces number of devices and cost simultaneously.The invention provides a kind of constant current source power supply circuit of the breath signal sensor based on air bed, mainly adopt a Design of Amplifiers constant current source.
In order to solve the problems of the technologies described above, the constant current source power supply circuit of a kind of breath signal sensor based on air bed of the present invention, wherein, breath signal is gathered by sensor, the structure of this sensor is the wheatstone bridge configuration of 4 P type resistance compositions, there is semiconductor membrane described P type resistance inside, constant current source power supply circuit comprises operational amplifier, resistance R1, resistance R2, voltage stabilizing diode D1 and electric capacity C1, + IN the input end of described sensor connects and is connected with the output terminal of operational amplifier, the in-phase input end of described operational amplifier simultaneously with one end of described resistance R1, the negative electrode of described voltage stabilizing diode D1 is connected with-IN the input end of described sensor, the other end of described resistance R1 is connected to supply voltage, the inverting input of described operational amplifier is connected with ground voltage by described resistance R2, the anode of described voltage stabilizing diode D1 is connected with ground voltage with one end of described electric capacity C1 simultaneously, the other end ground connection of described electric capacity C1.
Wherein, described operational amplifier selects the AD823AR operational amplifier that Analog Device company produces.
Compared with prior art, the invention has the beneficial effects as follows:
NPC1210 series low pressure sensor adopts constant current source power supply, due to the wheatstone bridge configuration that the inner primary structure of NPC1210 series low pressure sensor is made up of strain diaphragm.When powering compared to constant pressure source, when the sensor of wheatstone bridge configuration adopts constant current source power supply, sensor output voltage only with the increment of membrane resistance and constant current source size of current linear, the impact such as temperature, sensor accuracy can not be subject to, not only decrease number of devices and reduce cost, and the stability that sensor exports is higher.
Accompanying drawing explanation
Fig. 1 is the issuable Harmfulness analyse schematic diagram of apnea syndrome;
Fig. 2 is that breath signal is subject to mixing of multiple undesired signal affecting schematic diagram;
Fig. 3 is constant current source power supply circuit theory diagrams of the present invention;
Fig. 4 is application example schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is described in further detail.
As shown in Figure 3, the constant current source power supply circuit of a kind of breath signal sensor based on air bed of the present invention, wherein, breath signal is gathered by sensor, the structure of this sensor is the wheatstone bridge configuration of 4 P type resistance compositions, there is semiconductor membrane described P type resistance inside, constant current source power supply circuit comprises operational amplifier, resistance R1, resistance R2, voltage stabilizing diode D1 and electric capacity C1, + IN the input end of described sensor connects and is connected with the output terminal of operational amplifier, the in-phase input end of described operational amplifier simultaneously with one end of described resistance R1, the negative electrode of described voltage stabilizing diode D1 is connected with-IN the input end of described sensor, the other end of described resistance R1 is connected to supply voltage, the inverting input of described operational amplifier is connected with ground voltage by described resistance R2, the anode of described voltage stabilizing diode D1 is connected with ground voltage with one end of described electric capacity C1 simultaneously, the other end ground connection of described electric capacity C1.Wherein, described operational amplifier selects the AD823AR operational amplifier that Analog Device company produces.
As described in Figure 4, constant current source power supply circuit of the present invention is used for the breath signal harvester based on air bed, this breath signal harvester comprises air bed, described air bed is made up of multiple air chamber arranged side by side, 2 spaced apart air chambers are wherein for measuring air chamber 1, remaining air chamber is support air chamber 2, two measurement air chambers 1 are connected to a piezoresistive pressure sensor 4 input end respectively by a connecting duct 3, is connected with balance pipe 5 between described two measurement air chambers 1.It is a that described piezoresistive pressure sensor 4 is selected in the low pressure sensor of the NPC1210 series of GE company.Its principal feature has: 1. within the scope of 0 ~ 60 DEG C, have temperature compensation characteristic, substantially contains the temperature range that domestic monitoring uses; 2. pressure range is-10 ~ 10 inchess of water(in H2O), overload pressure 5Psi, and Full-span output voltage is 50mV, reaches the requirement designed sensitivity and range; 3. input impedance 2500 ~ 6000 Europe (representative value 4000 Europe), output impedance 4000 ~ 6000 Europe (representative value 5000 Europe); 4. full scale temperature accuracy-1.0 ~ 1.0%FSO, zero temperature accuracy-1.25 ~ 1.25%FSO; 5. stability 5uV/V, smooth to the response of 2KHz range of frequencies from nearly 0.01Hz, the respiratory waveform that piezoresistive transducer is measured is better than piezoelectric sensor fidelity.NPC1210 is widely used in Medical Devices, lung ventilator, air flow detection; The low pressure sensor of NPC1210 series is the product of a comparative maturity.
The structure of described piezoresistive pressure sensor 4 is wheatstone bridge configuration of 4 P type resistance compositions, and there is semiconductor membrane described P type resistance inside.Constant current source power supply circuit 6 of the present invention is connected between+IN the input end of described piezoresistive pressure sensor and-IN input end.NPC1210 series low pressure sensor adopts constant current source power supply, mentions the wheatstone bridge configuration that its inner primary structure is made up of strain diaphragm above.When powering compared to constant pressure source, when the sensor of wheatstone bridge configuration adopts constant current source power supply, sensor output voltage only with the increment of membrane resistance and constant current source size of current linear, can not be subject to the impact such as temperature, sensor accuracy, therefore the stability that exports of sensor is higher.
Quality due to constant current source directly has influence on the precision of sensor and the acquisition precision of signal, therefore needs to select the amplifiers of good performance such as common-mode rejection ratio, temperature coefficient, DC noise.That operational amplifier is wherein selected is the AD823AR that Analog Device company produces.
As shown in Figure 3, operational amplifier in-phase end identical with the magnitude of voltage of end of oppisite phase (being U1), the electric current I size through sensor NPC1210 determines by by stabilivolt D1 voltage stabilizing value (U1-VSS) and resistance R2 resistance, that is:
Resistance R2 selects the metal film precision resistance of 2.0k Ω, and the model of stabilivolt D1 is 1N4736_3V0, voltage stabilizing value 3.0V.The constant current source size produced is 1.5mA.
Although invention has been described by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (4)
1. the constant current source power supply circuit based on the breath signal sensor of air bed, wherein, breath signal is gathered by sensor, and the structure of this sensor is the wheatstone bridge configuration of 4 P type resistance compositions, there is semiconductor membrane described P type resistance inside, it is characterized in that:
Constant current source power supply circuit comprises operational amplifier, resistance R1, resistance R2, voltage stabilizing diode D1 and electric capacity C1, + IN the input end of described sensor connects and is connected with the output terminal of operational amplifier, the in-phase input end of described operational amplifier simultaneously with one end of described resistance R1, the negative electrode of described voltage stabilizing diode D1 is connected with-IN the input end of described sensor, the other end of described resistance R1 is connected to supply voltage, the inverting input of described operational amplifier is connected with ground voltage by described resistance R2, the anode of described voltage stabilizing diode D1 is connected with ground voltage with one end of described electric capacity C1 simultaneously, the other end ground connection of described electric capacity C1.
2. according to claim 1 based on the constant-current source circuit of the breath signal sensor of air bed, it is characterized in that, the AD823AR operational amplifier that described operational amplifier selects Analog Device company to produce.
3. according to claim 1 based on the constant-current source circuit of the breath signal sensor of air bed, it is characterized in that, described resistance R2 selects the metal film precision resistance of 2.0k Ω.
4. according to claim 1 based on the constant-current source circuit of the breath signal sensor of air bed, it is characterized in that, the model of described voltage stabilizing diode D1 is 1N4736_3V0, and its voltage stabilizing value is 3.0V, and the constant current source size of generation is 1.5mA.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070113665A1 (en) * | 2005-11-10 | 2007-05-24 | Honeywell International Inc. | Pressure and temperature sensing element |
| CN201293698Y (en) * | 2008-12-02 | 2009-08-19 | 西安中星测控有限公司 | Pressure transmitter with temperature compensation circuit |
| CN201382913Y (en) * | 2009-02-19 | 2010-01-13 | 哈尔滨东方报警设备开发有限公司 | Gas detector with sensor over concentration protection |
| CN203323928U (en) * | 2013-06-27 | 2013-12-04 | 无锡信大气象传感网科技有限公司 | Piezoresistive pressure transmitter |
| CN204536969U (en) * | 2014-12-12 | 2015-08-05 | 天津大学 | A kind of constant current source power supply circuit of the breath signal sensor based on air bed |
-
2014
- 2014-12-12 CN CN201410768774.9A patent/CN104516387B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070113665A1 (en) * | 2005-11-10 | 2007-05-24 | Honeywell International Inc. | Pressure and temperature sensing element |
| CN201293698Y (en) * | 2008-12-02 | 2009-08-19 | 西安中星测控有限公司 | Pressure transmitter with temperature compensation circuit |
| CN201382913Y (en) * | 2009-02-19 | 2010-01-13 | 哈尔滨东方报警设备开发有限公司 | Gas detector with sensor over concentration protection |
| CN203323928U (en) * | 2013-06-27 | 2013-12-04 | 无锡信大气象传感网科技有限公司 | Piezoresistive pressure transmitter |
| CN204536969U (en) * | 2014-12-12 | 2015-08-05 | 天津大学 | A kind of constant current source power supply circuit of the breath signal sensor based on air bed |
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