CN103893869B - A kind of apparatus and method improved respirator inlet valve control accuracy - Google Patents
A kind of apparatus and method improved respirator inlet valve control accuracy Download PDFInfo
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- CN103893869B CN103893869B CN201210587639.5A CN201210587639A CN103893869B CN 103893869 B CN103893869 B CN 103893869B CN 201210587639 A CN201210587639 A CN 201210587639A CN 103893869 B CN103893869 B CN 103893869B
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Abstract
The invention provides the apparatus and method of a kind of raising to respirator inlet valve control accuracy, described device comprises: inlet valve movement velocity induction installation, the movement velocity of inlet valve is converted to the detectable signal of electricity; Signal amplification module, is connected with inlet valve movement velocity induction installation, extracts and amplify detectable signal; Reference voltage provides module, provides reference voltage; DC bias circuit module, provides module to be connected with signal amplification module and reference voltage, the detectable signal after amplification and reference voltage is added; Controller, is connected with DC bias circuit module, controls inlet valve driver and regulates inlet valve motion.Technical scheme provided by the invention, by induction coil and inlet valve are mechanically connected, make induction coil in magnetic field, follow inlet valve motion, produce back-emf signal, this signal is amplified and is added with a reference voltage, the feedback signal back of gained to controller, to realize accurately controlling the position of inlet valve.
Description
Technical field
The present invention relates to respirator technical field, particularly relate to the apparatus and method of a kind of raising to respirator inlet valve control accuracy.
Background technology
Respirator is that a kind of normal physiological that can replace, control or change people is breathed, increase pulmonary ventilation volume, improve respiratory function, alleviate work of breathing consumption, save the device of heart reservation ability, be applied in more and more widely in the fields such as first aid, anesthesia and respiratory therapy.Air-breathing module is gas circuit unit important in respirator, controls inspiratory airflow by the motion controlling inlet valve in air-breathing module.Compared by the gas flow measured value measured by respiration parameter reference value that operator is set and external sensor, the result compared is passed through controller, produce control signal, control the motion of inlet valve driver drives inlet valve, the tidal volume needed for output is for patient respiratory.
Fig. 1 is respirator inlet valve motion control device system function module block diagram in prior art, as shown in Figure 1, the respirator of existing technology generally adopts method to be: inspiratory flow sensor, inspiratory pressure sensor, the actual value of inspiratory flow is flowed to controller by the external sensors such as suction temperature sensor (compensation calculation is used), controller produces error signal and flows to inlet valve driver, drives inlet valve, realizes air-breathing and controls.The shortcoming of prior art is: (1) inlet valve switch there will be a certain amount of overshoot, makes gas circuit changes in flow rate undulatory property large, is unfavorable for the stability contorting of system; (2) only can not carry out dynamic conditioning to the inlet valve in motion by the electric current in inlet valve and flow transducer, the real-time of control is poor.
At present, the position accurately controlling inlet valve also belongs to technical problem just to be solved.
Summary of the invention
The invention provides the apparatus and method of a kind of raising to respirator inlet valve control accuracy, to realize, to the accurate control of inlet valve position, preventing inlet valve from shaking.Described technical scheme is as follows:
Improve the device to respirator inlet valve control accuracy, it is characterized in that, comprising:
Inlet valve movement velocity induction installation, utilizes the induction coil and magnetic field of following inlet valve motion, converts the movement velocity of inlet valve to detectable signal;
Signal amplification module, is connected with described inlet valve movement velocity induction installation, for extracting and amplifying described detectable signal;
Reference voltage provides module, for providing reference voltage;
DC bias circuit module, provides module to be connected with described signal amplification module with described reference voltage, for the detectable signal after described amplification and described reference voltage being added, obtains feedback signal;
Controller, is connected with described DC bias circuit module, receives described feedback signal, according to described feedback signal, produces regulating and controlling signal, controls inlet valve driver and regulates inlet valve motion.
Further, described inlet valve movement velocity induction installation comprises:
Annular magnet, induction coil and soft iron cover;
What described induction coil was coaxial be enclosed within described annular magnet is outer and be not connected, what described soft iron cover was coaxial be enclosed within described induction coil is outer and be not connected, described annular magnet is relative fixing with soft iron cover, coaxial being mechanically connected with inlet valve of described induction coil, follows described inlet valve and does identical motion;
When described inlet valve motion, described induction coil is followed described inlet valve and is moved in the magnetic field that described annular magnet and soft iron cover are formed, and produces induction electromotive force, as the detectable signal of the described inlet valve motion of detection.
Further, described signal amplification module adopts instrument amplifier circuit, and two inputs connect two outfans of induction coil respectively.
Further, described reference voltage provides module to comprise three-terminal voltage-stabilizing pipe, and input connects power supply, the reference voltage of outfan stable output.
Further, described reference voltage is 1.25V.
Further, described DC bias circuit module comprises homophase summing circuit.
Further, described controller comprises DSP microprocessor and D/A converter.
Improve the method to respirator inlet valve control accuracy, comprising:
Utilize the induction coil and magnetic field of following inlet valve motion, convert the movement velocity of inlet valve to detectable signal;
Extract described detectable signal and amplify, the detectable signal after described amplification being added with reference voltage, obtaining feedback signal;
Described feedback signal is passed to controller, and described controller controls according to the motion of described feedback signal to inlet valve.
Further, by induction coil and described inlet valve are mechanically connected, make described induction coil in magnetic field, follow the motion of described inlet valve, in described induction coil, produce induction electromotive force, thus convert the movement velocity of described inlet valve to detectable signal.
Further, instrument amplifier circuit is adopted to amplify described detectable signal.
The technical scheme that the embodiment of the present invention provides, by induction coil and inlet valve are mechanically connected, make induction coil in magnetic field, follow inlet valve motion, produce back-emf signal, this signal is passed through instrument amplifier circuit, and and reference voltage be added, the feedback signal back of gained to controller, to realize accurately controlling the position of inlet valve.
Accompanying drawing explanation
Fig. 1 is respirator inlet valve motion control device system function module block diagram in prior art;
Fig. 2 is that the raising that provides of the embodiment of the present invention is to the apparatus system functional block diagram of respirator inlet valve control accuracy;
Fig. 3 is the inlet valve movement velocity induction installation cross section structure schematic diagram that the embodiment of the present invention provides;
The respirator inlet valve motion control device system function module block diagram that Fig. 4 embodiment of the present invention provides;
The circuit diagram of Fig. 5 to be the raising that preferably provides of the embodiment of the present invention to signal amplification module in the device of respirator inlet valve control accuracy, reference voltage provide module and DC bias circuit module.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein, only for explaining the present invention, but not limitation of the invention.
Embodiment
The basic functional principle of the embodiment of the present invention is:
External sensor due to prior art only reflects the rough situation of inlet valve, the motion trickle fast for inlet valve cannot detect, and inlet valve there will be shake sometimes, the shake of inlet valve is that external sensor can not detect, and therefore can obtain inlet valve motion conditions trickle fast by the speed detecting inlet valve motion.
Induction coil and inlet valve are mechanically connected by the present invention, in the process of inlet valve rapid movement, make changed by magnetic induction in induction coil and produce induction electromotive force, this induction electromotive force can the motion conditions of characterizing inhalation valve, induction electromotive force is obtained feedback signal through process, obtain regulating and controlling signal according to feedback signal, control the fine movement that inlet valve driver regulates inlet valve, eliminate the shake in the middle of inlet valve motion.
In addition, because the signal of external sensor also can reflect the angle etc. that inlet valve is opened, and induction coil only can detect the speed of inlet valve, and therefore after adding induction coil, external sensor is also absolutely necessary.
Concrete:
Fig. 2 be the raising that provides of the embodiment of the present invention to the apparatus system functional block diagram of respirator inlet valve control accuracy, as shown in Figure 2:
Improve the device to respirator inlet valve control accuracy, comprising:
Inlet valve movement velocity induction installation 201, utilizes the induction coil and magnetic field of following inlet valve motion, the movement velocity of inlet valve is converted to the detectable signal of electricity; Signal amplification module 202, is connected with inlet valve movement velocity induction installation, for extracting and amplifying detectable signal; Reference voltage provides module 203, for providing reference voltage; DC bias circuit module 204, provides module to be connected with signal amplification module and reference voltage, for the detectable signal after amplification and reference voltage being added, obtains feedback signal; Controller 205, is connected with DC bias circuit module 204, for according to feedback signal, produces regulating and controlling signal, controls the fine movement that inlet valve driver regulates inlet valve.
Wherein, in embodiments of the invention, signal amplification module 202 preferably selects instrument amplifier circuit, two inputs connect two outfans of induction coil respectively, the electric potential difference at induction coil two ends is detectable signal, instrument amplifier circuit extracts detectable signal by asking difference, and is amplified by detectable signal.
Wherein, reference voltage provides module 203 to comprise three-terminal voltage-stabilizing pipe, and input connects power supply, the reference voltage of outfan stable output.It is 1.25V's that embodiments of the invention preferably choose reference voltage.
DC bias circuit module 204 comprises homophase summing circuit.
Controller 205 have employed DSP microprocessor, and controller 205, except the feedback signal that produces of induction coil in process the present invention, also processes the signal of the rough situation of reflection inlet valve that other external sensors collect.The control signal that controller 205 exports is: Vout=V+k Δ V, wherein, Vout is the voltage of the control inlet valve of the actual output of D/A converter, V is inspiratory flow sensor, inspiratory pressure sensor, the control signal of the process gained of the feedback signal via controller of the external sensors such as suction temperature sensor, Δ V is the detectable signal that induction coil collects, via controller 205 processes the regulating and controlling voltage of gained, and k is adjustment factor, is obtained by test.Wherein, the process of the signal that controller 205 pairs of external sensors and induction coil collect is, by the signal that collects compared with presetting reference signal, obtains control signal.If inlet valve is not shaken, then make k=0, just do not calculate the effect of induction electromotive force; If inlet valve is shaken, so just above formula is used to regulate.
Fig. 3 is the inlet valve movement velocity induction installation cross section structure schematic diagram that the embodiment of the present invention provides, as shown in Figure 3:
Wherein, inlet valve movement velocity induction installation 201 comprises:
Annular magnet 301, induction coil 302 and soft iron cover 303;
What induction coil 302 was coaxial be enclosed within annular magnet 301 is outer and be not connected, it is outer and be not connected that soft iron overlaps the 303 coaxial induction coils 302 that are enclosed within, annular magnet 301 is relative fixing with soft iron cover 303, coaxial being mechanically connected with inlet valve of induction coil 302, follow inlet valve and do identical motion, as shown in Figure 3, axle center 305 is annular magnet 301, induction coil 302 and soft iron overlap 303 common axle center, and induction coil 302 moves with the direction of inlet valve along axle center.
When inlet valve moves, induction coil 302 is followed inlet valve and is moved in the magnetic field that annular magnet 301 and soft iron cover 303 are formed, and produces induction electromotive force, as the detectable signal of the described inlet valve motion of detection.
As seen from Figure 3, annular magnet 301 and soft iron cover 303 gap places between which can produce a radial direction and magnetic field 304 outside being pointed to by axle center, when induction coil moves vertically, do the motion of cutting magnetic induction line, therefore can produce induction electromotive force in induction coil, the speed that the size of induction electromotive force and induction coil move has relation.
If coil-end voltage u, electric current is i, coil inductance L
a, resistance R
a, movement velocity is v, and the effective length in magnetic field is L, and the air gap flux density in magnetic field is B
δ, then the counter electromotive force produced in induction coil during inlet valve motion is:
The respirator inlet valve motion control device system function module block diagram that Fig. 4 embodiment of the present invention preferably provides, as shown in Figure 4:
External sensor 404 comprises: inspiratory flow sensor, inspiratory pressure sensor, suction temperature sensor etc., these sensors convert the situation of the inlet valve detected to the signal of telecommunication, through the process of signal deteching circuit 405, feed back to controller 401, simultaneously, induction coil 406 converts the speed conditions of inlet valve to the signal of telecommunication, through the process of signal processing circuit 407, also controller 401 is fed back to, wherein signal processing circuit 407 comprises signal amplification module, DC bias circuit module and reference voltage provide module, the feedback signal detected by external sensor 404 and induction coil 406 obtains a digital signal through the process of controller 401, this digital signal converts analog control signal to by D/A converter, inlet valve driver is controlled by analog control signal, driving inlet valve moves, whole system forms closed-loop control system.
The circuit diagram of Fig. 5 to be the raising that preferably provides of the embodiment of the present invention to signal amplification module in the device of respirator inlet valve control accuracy, reference voltage provide module and DC bias circuit module, as shown in Figure 5:
Because the induced electromotive force signal that induction coil produces is very faint, generally in uV ~ mV magnitude, can be submerged in the electromagnetic interference of respirator inside.If adopt the difference amplifier that single amplifier forms, higher to the required precision of outer meeting resistance, be also difficult to for actual measurement.When amplifying small-signal, preamplifier must have enough common mode rejection ratios, voltage amplification factor, input impedance and stability.And the low level signal amplification field that instrument amplifier circuit exports at sensor with features such as its high input impedance, high cmrr, low drifting is widely used.Therefore, embodiments of the invention preferably adopt instrument amplifier circuit as signal amplification module.
As Fig. 5, amplifier U1B, amplifier U1C, amplifier U1D and resistance R
1~ resistance R
9constitute signal amplification module, resistance R
1one end and resistance R
2one end as two signal input parts, be connected with the two ends of induction coil respectively, when induction coil moves with inlet valve, induction electromotive force can be produced at the two ends of coil, signal amplification module, by asking poor, is obtained the electric potential difference at coil two ends and as detectable signal, then to amplify.
Wherein, the gain of instrument amplifier circuit is:
Wherein, resistance R
4and R
5the equal R of resistance
6and R
7resistance equal,
Because the counter electromotive force produced in induction coil is:
So the output voltage of instrument amplifier circuit is:
U
1＝G
1u
There is provided module for reference voltage, the embodiment of the present invention have employed three-terminal voltage-stabilizing pipe, because if directly connect power supply, the ripple of power supply can disturb result.
Here adding DC bias circuit is because induction coil produces positive and negative different electromotive force to both direction athletic meeting, and the feedback signal feeding back to DSP microprocessor must be positive, so add that a DC offset voltage draws negative signal just.DC bias circuit is added the detectable signal after amplification and reference voltage and then amplifies, and output signal feeds back to DSP microprocessor and processes.
The gain of DC bias circuit is:
So the output voltage of DC bias circuit is:
Wherein, resistance R
10~ resistance R
15resistance all equal;
U
2for reference voltage, embodiments of the invention preferably get U
2=1.25V.
Generally speaking, the present invention utilizes the induction coil and magnetic field of following inlet valve motion, the movement velocity of inlet valve is converted to the detectable signal of electricity, be mechanically connected particular by by induction coil and inlet valve, make induction coil in magnetic field, follow inlet valve motion, in induction coil, produce induction electromotive force, thus convert the movement velocity of inlet valve to the signal of telecommunication; Extract detectable signal and amplify, the detectable signal after amplifying being added with reference voltage, obtaining feedback signal; Feedback signal is passed to controller, and then the motion of inlet valve is controlled.
The technical scheme that the embodiment of the present invention provides, by induction coil and inlet valve are mechanically connected, make induction coil in magnetic field, follow inlet valve motion, produce back-emf signal, this signal is passed through instrument amplifier circuit, and and reference voltage be added, the feedback signal back of gained to controller, to realize accurately controlling the position of inlet valve.
Below be only illustrating of doing for the preferred embodiments of the present invention and know-why thereof; and the restriction not technology contents of the present invention carried out; anyly be familiar with those skilled in the art in technical scope disclosed in this invention; the change easily expected or replacement, all should be encompassed in protection scope of the present invention.
Claims (10)
1. improve the device to respirator inlet valve control accuracy, it is characterized in that, comprising:
Inlet valve movement velocity induction installation, utilizes the induction coil and magnetic field of following inlet valve motion, converts the movement velocity of inlet valve to detectable signal;
Signal amplification module, is connected with described inlet valve movement velocity induction installation, for extracting and amplifying described detectable signal;
Reference voltage provides module, for providing reference voltage;
DC bias circuit module, provides module to be connected with described signal amplification module with described reference voltage, for the detectable signal after described amplification and described reference voltage being added, obtains feedback signal;
Controller, is connected with described DC bias circuit module, receives described feedback signal, according to described feedback signal, produces regulating and controlling signal, controls inlet valve driver and regulates inlet valve motion.
2. device according to claim 1, is characterized in that, described inlet valve movement velocity induction installation comprises:
Annular magnet, induction coil and soft iron cover;
What described induction coil was coaxial be enclosed within described annular magnet is outer and be not connected, what described soft iron cover was coaxial be enclosed within described induction coil is outer and be not connected, described annular magnet is relative fixing with soft iron cover, coaxial being mechanically connected with inlet valve of described induction coil, follows described inlet valve and does identical motion;
When described inlet valve motion, described induction coil is followed described inlet valve and is moved in the magnetic field that described annular magnet and soft iron cover are formed, and produces induction electromotive force, as the detectable signal of the described inlet valve motion of detection.
3. device according to claim 1, is characterized in that, described signal amplification module adopts instrument amplifier circuit, and two inputs connect two outfans of induction coil respectively.
4. device according to claim 1, is characterized in that, described reference voltage provides module to comprise three-terminal voltage-stabilizing pipe, and input connects power supply, the reference voltage of outfan stable output.
5. device according to claim 4, is characterized in that, described reference voltage is 1.25V.
6. device according to claim 1, is characterized in that, described DC bias circuit module comprises homophase summing circuit.
7. device according to claim 1, is characterized in that, described controller comprises DSP microprocessor and D/A converter.
8. improve the method to respirator inlet valve control accuracy, it is characterized in that, comprising:
Utilize the induction coil and magnetic field of following inlet valve motion, convert the movement velocity of inlet valve to detectable signal;
Extract described detectable signal and amplify, the detectable signal after described amplification being added with reference voltage, obtaining feedback signal;
Described feedback signal is passed to controller, and described controller controls according to the motion of described feedback signal to inlet valve.
9. method according to claim 8, it is characterized in that, by induction coil and described inlet valve are mechanically connected, make described induction coil in magnetic field, follow the motion of described inlet valve, in described induction coil, produce induction electromotive force, thus convert the movement velocity of described inlet valve to detectable signal.
10. method according to claim 8, is characterized in that, adopts instrument amplifier circuit to amplify described detectable signal.
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| GB2516806A (en) * | 2013-04-29 | 2015-02-11 | F X K Patents Ltd | An electro-pneumatic generator |
| CN105327436A (en) * | 2014-08-08 | 2016-02-17 | 北京谊安医疗系统股份有限公司 | Control circuit of air way pressure of anaesthesia machine |
| EP3002026A1 (en) * | 2014-09-30 | 2016-04-06 | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | System and method for stabilizing a voice coil motor |
| CN104707228B (en) * | 2015-03-02 | 2017-05-17 | 深圳市科曼医疗设备有限公司 | Transnasal high-flow-capacity oxygen therapy pressure monitoring system and method |
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| EP0923959A1 (en) * | 1997-12-15 | 1999-06-23 | Siemens-Elema AB | Gas flow control valve |
| CN2564825Y (en) * | 2002-10-11 | 2003-08-06 | 长葛市黄河电气有限公司 | Detector for state of electromagnetic valve |
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