CN204542110U - A kind of pulse signal detector control system - Google Patents
A kind of pulse signal detector control system Download PDFInfo
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- CN204542110U CN204542110U CN201520082217.1U CN201520082217U CN204542110U CN 204542110 U CN204542110 U CN 204542110U CN 201520082217 U CN201520082217 U CN 201520082217U CN 204542110 U CN204542110 U CN 204542110U
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- operational amplifier
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Abstract
This utility model relates to medical inspection device technical field, especially a kind of pulse signal detector control system.It comprises enumerator, for gather pulse signal and pulse signal is converted to voltage signal piezoelectric film sensor, be used for the voltage signal that amplification piezoelectric thin film sensor exports amplifying circuit, be used for high-frequency signal in voltage signal that filtering amplifying circuit exports and power frequency component and simultaneously the filter circuit of outputting analog signal, the analogue signal be used for filter circuit exports are converted to square-wave signal and export the shaping circuit in enumerator to.The piezoelectric film sensor characteristic that utilizes this utility model detects pulse change accurately, by the amplification to pulse signal, filtering and Shape correction, realize the output of corresponding square-wave signal, thus accurately can be identified by enumerator, after testing, whole system error is within 3%; The system structure that its structure is simple, greatly simplifie existing detector, improves accuracy and the reliability of system.
Description
Technical field
This utility model relates to medical inspection device technical field, especially a kind of pulse signal detector control system.
Background technology
Pulse is one of physiological feature of wanting of body weight for humans, it is caused by the diastole of cardiac cycle and contraction, so the size of pulse must be subject to the impact of heart, also can indirectly infer human body artery pipe feature and blood characteristics parameter etc. according to pulse signal simultaneously.Therefore, carry out quantitatively or qualitative detection human pulse, in medical diagnosis, have important practical be worth, also just because of this, the instrument and equipments such as pulse signal detection arise at the historic moment.
But, existing pulse signal detection device but ubiquity system structure complicated, manufacture and use cost compared with high, error large, accuracy and problems, the serious result of use limiting checkout gear and the range of application such as reliability is low.
Utility model content
For the deficiency that above-mentioned prior art exists, the purpose of this utility model is to provide that a kind of system structure is simple, error is little, accuracy and the high pulse signal detector control system of reliability.
To achieve these goals, this utility model adopts following technical scheme:
A kind of pulse signal detector control system, it comprises enumerator, it also comprise for gather pulse signal and pulse signal is converted to voltage signal piezoelectric film sensor, be used for the voltage signal that amplification piezoelectric thin film sensor exports amplifying circuit, be used for high-frequency signal in voltage signal that filtering amplifying circuit exports and power frequency component and simultaneously the filter circuit of outputting analog signal, the analogue signal be used for filter circuit exports are converted to square-wave signal and export the shaping circuit in enumerator to.
Preferably, described amplifying circuit comprises one-level amplifying unit, secondary amplifying unit, power supply and pull-up resistor, the input of described one-level amplifying unit is connected to the outfan of piezoelectric film sensor, the input of described one-level amplifying unit is also connected with power supply by pull-up resistor, the input that input is connected with the outfan of one-level amplifying unit, outfan is connected to filter circuit of described secondary amplifying unit;
Described one-level amplifying unit comprises the first operational amplifier, the first electric capacity, the first resistance, the second resistance and the 3rd resistance, the in-phase input end of described first operational amplifier connects pull-up resistor by the first electric capacity and passes through the first resistance eutral grounding, between the inverting input that described second resistance is connected to the first operational amplifier and signal output part, the inverting input of described first operational amplifier is by the 3rd resistance eutral grounding;
Described secondary amplifying unit comprises the second operational amplifier, the second electric capacity, the 4th resistance, the 5th resistance and the 6th resistance, the in-phase input end of described second operational amplifier by the second electric capacity connect the first operational amplifier signal output part and by the 4th resistance eutral grounding, between the inverting input that described 5th resistance is connected to the second operational amplifier and signal output part, the inverting input of described second operational amplifier is connected with the input of filter circuit by the 6th resistance eutral grounding, signal output part.
Preferably, described filter circuit comprises the 50Hz wave trap for the power frequency component in filtering voltage signal and the bandpass filtering unit for the ultra-low frequency signal in filtering voltage signal and high-frequency signal;
Described bandpass filtering unit comprises the 3rd operational amplifier and four-operational amplifier, the end of oppisite phase of described 3rd operational amplifier is connected the outfan of amplifying circuit with the 8th resistance by the 7th resistance of connecting successively, be in series with the 3rd electric capacity and the 9th resistance between the inverting input of described 3rd operational amplifier and in-phase input end, be connected with rheostat between in-phase input end and signal output part, described 7th resistance connects the signal output part of the 3rd operational amplifier by the 4th electric capacity; The in-phase input end of described four-operational amplifier is connected the signal output part of the 3rd operational amplifier with the 6th electric capacity by the 5th electric capacity of connecting successively, be in series with the tenth resistance and the 11 resistance, be connected with the 12 resistance between signal output part and the 5th electric capacity between the in-phase input end of described four-operational amplifier and inverting input;
The signal output part of described four-operational amplifier connects the input of shaping circuit by 50Hz wave trap.
Preferably, described shaping circuit comprises the 5th operational amplifier, 6th operational amplifier and the 7th operational amplifier, the in-phase input end of described 5th operational amplifier, the in-phase input end of the 6th operational amplifier is all connected the outfan of filter circuit with the in-phase input end of the 7th operational amplifier by one first shaping resistance, the inverting input of described 5th operational amplifier and the inverting input of the 6th operational amplifier are all by one first shaping capacitance ground connection, the inverting input of described 7th operational amplifier is connected the signal output part of the 5th operational amplifier with the first diode by the second shaping resistance of connecting successively, be connected the signal output part of the 6th operational amplifier with the second diode by the 3rd shaping resistance of connecting successively, the signal output part linkage counter of described 7th operational amplifier.
Preferably, described piezoelectric film sensor comprises piezoelectric membrane, substrate and organic plastics film, and piezoelectric membrane is packaged on substrate by described organic plastics film; Described piezoelectric membrane is 30 square millimeters in square, area coverage.
Owing to have employed such scheme, the piezoelectric film sensor characteristic that utilizes this utility model detects pulse change accurately, by the amplification to pulse signal, filtering and Shape correction, realize the output of corresponding square-wave signal, thus accurately can be identified by enumerator, after testing, whole system error is within 3%; The system structure that its structure is simple, greatly simplifie existing detector, improves accuracy and the reliability of system.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of this utility model embodiment;
Fig. 2 is the circuit structure diagram of the amplifying circuit of this utility model embodiment;
Fig. 3 is the circuit structure diagram of the bandpass filtering unit of this utility model embodiment;
Fig. 4 is the circuit structure diagram of the 50Hz wave trap of this utility model embodiment
Fig. 5 is the circuit structure diagram of the shaping circuit of this utility model embodiment;
Fig. 6 is the cross section structure schematic diagram of the piezoelectric film sensor of this utility model embodiment.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that this utility model can be defined by the claims and cover is implemented.
As shown in Figures 1 to 6, a kind of pulse signal detector control system that the present embodiment provides, it comprises:
Enumerator 1;
Piezoelectric film sensor 2, for gathering pulse signal and pulse signal being converted to voltage signal;
Amplifying circuit 3, for the voltage signal that amplification piezoelectric thin film sensor 2 exports;
Filter circuit 4, for the high-frequency signal in the voltage signal that amplifying circuit 3 exports and power frequency component and simultaneously outputting analog signal;
Shaping circuit 5, the analogue signal for being exported by filter circuit 4 is converted to the discernible square-wave signal of enumerator 1.
By said system structure, piezoelectric film sensor 2 characteristic can be utilized to detect pulse change accurately, by the amplification to pulse signal, filtering and Shape correction, realize the output of corresponding square-wave signal, thus accurately can be identified by enumerator, whole system error is within 3% after testing, so improve accuracy and the reliability of system.
Further, be optimize the circuit structure of whole system, ensure the accuracy of Signal transmissions, the amplifying circuit 3 of the present embodiment comprises one-level amplifying unit, secondary amplifying unit, the power supply 6 of 3V and pull-up resistor Rc; Wherein, the input of one-level amplifying unit is connected to the outfan of piezoelectric film sensor 2, the input of one-level amplifying unit is also connected with power supply 6 by pull-up resistor Rc, the input that the input of secondary amplifying unit is connected with the outfan of one-level amplifying unit, outfan is connected to filter circuit 4;
The one-level amplifying unit of the present embodiment comprises the first operational amplifier U1, the first electric capacity C1, the first resistance R1, the second resistance R2 and the 3rd resistance R3, the in-phase input end of the first operational amplifier U1 connects pull-up resistor Rc by the first electric capacity C1 and passes through the first resistance R1 ground connection, between the inverting input that second resistance R2 is connected to the first operational amplifier U1 and signal output part, the inverting input of the first operational amplifier U1 is by the 3rd resistance R3 ground connection; Secondary amplifying unit then comprises the second operational amplifier U2, the second electric capacity C2, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, the in-phase input end of the second operational amplifier U2 by the second electric capacity C2 connect the first operational amplifier U1 signal output part and by the 4th resistance R4 ground connection, between the inverting input that 5th resistance R5 is connected to the second operational amplifier U2 and signal output part, the inverting input of the second operational amplifier U2 is connected with the input of filter circuit 4 by the 6th resistance R6 ground connection, signal output part.
So, amplifying circuit 3 can be utilized suitably to be amplified by the weak voltage signals that piezoelectric film sensor 2 exports, and two the RC filter circuits utilizing the first electric capacity C1, the first resistance R1, the second electric capacity C2 and the 4th resistance R4 to form realize the filtering to the DC component in signal.
This due to piezoelectric film sensor 2 export signal and non-fully has caused by the fluctuation of tremulous pulse, therefore in wherein formed voltage signal, also include noise jamming signal and 50Hz power frequency component, therefore for ensureing the accuracy of signal to greatest extent, the filter circuit 4 of the present embodiment comprises the 50Hz wave trap (its particular circuit configurations can be arranged with reference to figure 4) for the power frequency component in filtering voltage signal and the bandpass filtering unit for the ultra-low frequency signal in filtering voltage signal and high-frequency signal; The bandpass filtering unit of the present embodiment comprises the 3rd operational amplifier U3 and four-operational amplifier U4, the end of oppisite phase of the 3rd operational amplifier U3 is connected the outfan of amplifying circuit 3 with the 8th resistance R8 by the 7th resistance R7 connected successively, be in series with the 3rd electric capacity C3 and the 9th resistance R9 between the inverting input of the 3rd operational amplifier U3 and in-phase input end, be connected with rheostat R between in-phase input end and signal output part, the 7th resistance R7 connects the signal output part of the 3rd operational amplifier U3 by the 4th electric capacity C4; The in-phase input end of four-operational amplifier U4 is connected the signal output part of the 3rd operational amplifier U3 by the 5th electric capacity C5 connected successively with the 6th electric capacity C6, be in series with the tenth resistance R10 and the 11 resistance R11, be connected with the 12 resistance R12 between signal output part and the 5th electric capacity C5 between the in-phase input end of four-operational amplifier U4 and inverting input; Meanwhile, the signal output part of four-operational amplifier U4 connects the input of shaping circuit 5 by 50Hz wave trap.So, because the frequency of human pulse signal is mainly distributed between 0.2Hz-60Hz, so bandpass filtering unit can be utilized to realize ultra-low frequency signal and the target signal filter higher than more than 60Hz, simultaneously, utilizing 50Hz wave trap to carry out filter out-band pass filtering unit cannot the 50Hz power frequency component of effective filtering, and then ensures effective output of analogue signal.
Simultaneously, the shaping circuit 5 of the present embodiment comprises the 5th operational amplifier U5, 6th operational amplifier U6 and the 7th operational amplifier U7, the in-phase input end of the 5th operational amplifier U5, the in-phase input end of the 6th operational amplifier U6 and the in-phase input end of the 7th operational amplifier U7 are all connected the outfan of filter circuit 4 by one first shaping resistance Rz, the inverting input of the 5th operational amplifier U5 and the inverting input of the 6th operational amplifier U6 are all by one first shaping capacitance Cz ground connection, the inverting input of the 7th operational amplifier U7 is connected the signal output part of the 5th operational amplifier U5 with the first diode D1 by the second shaping resistance Ra connected successively, be connected the signal output part of the 6th operational amplifier U6 with the second diode D2 by the 3rd shaping resistance Rb that connects successively, the signal output part linkage counter 1 of the 7th operational amplifier U7.With this, the positive behavior square-wave signal of the irregular analogue signal that shaping circuit 5 can be utilized to be exported by filter circuit 4, to ensure that enumerator 1 can carry out effective Signal analysis.
In addition, the piezoelectric film sensor 2 of the present embodiment can be made up of critical pieces such as piezoelectric membrane 7, substrate 8 and organic plastics films 9, and wherein, piezoelectric membrane 7 is packaged on substrate 8 by organic plastics film 9; Piezoelectric membrane 7 is 30 square millimeters in square, area coverage.With this, by piezoelectric membrane 7 and human body wrist being close to, realize the accurate detection to pulse wave.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize this utility model description and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. a pulse signal detector control system, it comprises enumerator, it is characterized in that: it also comprise for gather pulse signal and pulse signal is converted to voltage signal piezoelectric film sensor, be used for the voltage signal that amplification piezoelectric thin film sensor exports amplifying circuit, be used for high-frequency signal in voltage signal that filtering amplifying circuit exports and power frequency component and simultaneously the filter circuit of outputting analog signal, the analogue signal be used for filter circuit exports are converted to square-wave signal and export the shaping circuit in enumerator to.
2. a kind of pulse signal detector control system as claimed in claim 1, it is characterized in that: described amplifying circuit comprises one-level amplifying unit, secondary amplifying unit, power supply and pull-up resistor, the input of described one-level amplifying unit is connected to the outfan of piezoelectric film sensor, the input of described one-level amplifying unit is also connected with power supply by pull-up resistor, the input that input is connected with the outfan of one-level amplifying unit, outfan is connected to filter circuit of described secondary amplifying unit;
Described one-level amplifying unit comprises the first operational amplifier, the first electric capacity, the first resistance, the second resistance and the 3rd resistance, the in-phase input end of described first operational amplifier connects pull-up resistor by the first electric capacity and passes through the first resistance eutral grounding, between the inverting input that described second resistance is connected to the first operational amplifier and signal output part, the inverting input of described first operational amplifier is by the 3rd resistance eutral grounding;
Described secondary amplifying unit comprises the second operational amplifier, the second electric capacity, the 4th resistance, the 5th resistance and the 6th resistance, the in-phase input end of described second operational amplifier by the second electric capacity connect the first operational amplifier signal output part and by the 4th resistance eutral grounding, between the inverting input that described 5th resistance is connected to the second operational amplifier and signal output part, the inverting input of described second operational amplifier is connected with the input of filter circuit by the 6th resistance eutral grounding, signal output part.
3. a kind of pulse signal detector control system as claimed in claim 1, is characterized in that: described filter circuit comprises the 50Hz wave trap for the power frequency component in filtering voltage signal and the bandpass filtering unit for the ultra-low frequency signal in filtering voltage signal and high-frequency signal;
Described bandpass filtering unit comprises the 3rd operational amplifier and four-operational amplifier, the end of oppisite phase of described 3rd operational amplifier is connected the outfan of amplifying circuit with the 8th resistance by the 7th resistance of connecting successively, be in series with the 3rd electric capacity and the 9th resistance between the inverting input of described 3rd operational amplifier and in-phase input end, be connected with rheostat between in-phase input end and signal output part, described 7th resistance connects the signal output part of the 3rd operational amplifier by the 4th electric capacity; The in-phase input end of described four-operational amplifier is connected the signal output part of the 3rd operational amplifier with the 6th electric capacity by the 5th electric capacity of connecting successively, be in series with the tenth resistance and the 11 resistance, be connected with the 12 resistance between signal output part and the 5th electric capacity between the in-phase input end of described four-operational amplifier and inverting input;
The signal output part of described four-operational amplifier connects the input of shaping circuit by 50Hz wave trap.
4. a kind of pulse signal detector control system as claimed in claim 1, it is characterized in that: described shaping circuit comprises the 5th operational amplifier, 6th operational amplifier and the 7th operational amplifier, the in-phase input end of described 5th operational amplifier, the in-phase input end of the 6th operational amplifier is all connected the outfan of filter circuit with the in-phase input end of the 7th operational amplifier by one first shaping resistance, the inverting input of described 5th operational amplifier and the inverting input of the 6th operational amplifier are all by one first shaping capacitance ground connection, the inverting input of described 7th operational amplifier is connected the signal output part of the 5th operational amplifier with the first diode by the second shaping resistance of connecting successively, be connected the signal output part of the 6th operational amplifier with the second diode by the 3rd shaping resistance of connecting successively, the signal output part linkage counter of described 7th operational amplifier.
5. a kind of pulse signal detector control system according to any one of claim 1-4, it is characterized in that: described piezoelectric film sensor comprises piezoelectric membrane, substrate and organic plastics film, piezoelectric membrane is packaged on substrate by described organic plastics film; Described piezoelectric membrane is 30 square millimeters in square, area coverage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520082217.1U CN204542110U (en) | 2015-02-02 | 2015-02-02 | A kind of pulse signal detector control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520082217.1U CN204542110U (en) | 2015-02-02 | 2015-02-02 | A kind of pulse signal detector control system |
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| CN204542110U true CN204542110U (en) | 2015-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520082217.1U Expired - Fee Related CN204542110U (en) | 2015-02-02 | 2015-02-02 | A kind of pulse signal detector control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106175734A (en) * | 2016-07-14 | 2016-12-07 | 苏州咖丢卫私康信息科技有限公司 | A kind of circuit extracting blood pressure cuff Sasser and blood pressure cuff measuring instrument |
| CN106911984A (en) * | 2017-01-19 | 2017-06-30 | 同济大学 | Phonoreception circuit based on amplifier |
| CN108933977A (en) * | 2018-09-27 | 2018-12-04 | 江苏鹿得医疗电子股份有限公司 | Cardiopulmonary sound pick up equipment |
-
2015
- 2015-02-02 CN CN201520082217.1U patent/CN204542110U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106175734A (en) * | 2016-07-14 | 2016-12-07 | 苏州咖丢卫私康信息科技有限公司 | A kind of circuit extracting blood pressure cuff Sasser and blood pressure cuff measuring instrument |
| CN106911984A (en) * | 2017-01-19 | 2017-06-30 | 同济大学 | Phonoreception circuit based on amplifier |
| CN106911984B (en) * | 2017-01-19 | 2020-08-14 | 同济大学 | Sound sensing circuit based on operational amplifier |
| CN108933977A (en) * | 2018-09-27 | 2018-12-04 | 江苏鹿得医疗电子股份有限公司 | Cardiopulmonary sound pick up equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20160202 |