CN204636340U - A kind of pulse test meter comparing shaping circuit based on self adaptation - Google Patents
A kind of pulse test meter comparing shaping circuit based on self adaptation Download PDFInfo
- Publication number
- CN204636340U CN204636340U CN201420860535.1U CN201420860535U CN204636340U CN 204636340 U CN204636340 U CN 204636340U CN 201420860535 U CN201420860535 U CN 201420860535U CN 204636340 U CN204636340 U CN 204636340U
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- China
- Prior art keywords
- operational amplifier
- shaping circuit
- self adaptation
- electronic potentiometer
- chip microcomputer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
The utility model discloses a kind of pulse test meter comparing shaping circuit based on self adaptation, comprise single-chip microcomputer, light emitting diode, phototriode and self adaptation and compare shaping circuit module; With light emitting diode and phototriode for core is formed a photoelectric testing sensor; Self adaptation compares shaping circuit module and forms primarily of operational amplifier OP1 and electronic potentiometer; The controlled end of electronic potentiometer is connected with the outfan of single-chip microcomputer, and the sliding end of electronic potentiometer is connected with the negative input end of operational amplifier OP1; The negative input end of operational amplifier OP1 is connected to the ground by the 3rd resistance R3 and connects; The positive input terminal of operational amplifier OP1 is connected with photoelectric testing sensor signal output part, and the outfan of operational amplifier OP1 is connected with the input port of single-chip microcomputer.This utility model has the advantage of the measurement fault that pulse test meter energy automatic calibration can be made to cause due to human body Individual differences.
Description
Technical field
This utility model relates to a kind of pulse test meter, and specifically the individual inadaptability of a kind of energy automatic calibration measures the pulse test meter of fault, belongs to observation and control technology field.
Background technology
Pulses measure medically has very important status.Adopt in prior art intelligent instrument to pulse carry out detect popular thinking be: carry out pulse detection based on the quick principle of power.Concrete, outside wrist pulse transducer bandage being fixed on tested person, along with every diastole is shunk once, the change of Arterial system generation pressure and blood flow, namely a pulse wave is produced, pulse transducer can well collect the beat process of human pulse signal and be converted into synchronous voltage signal output in this process, carries out further afterwards processing and shows.
In addition also exist in prior art and carry out pulse detection thinking based on photosensitive principle.Concrete, during use, finger is placed between light emitting diode and light receiving element, in blood vessel, the change of blood saturation causes the transfer strength of light to change, and makes infrared receiving diode export the pulse signal corresponding with heart beating beat, and is converted into synchronous voltage signal output.
The structure generally adopted in circuit design is: the output signal of the light detecting sensors be made up of light emitting diode and light receiving element is due to irregular, therefore need to become rule after shaping circuit process, be convenient to the digit pulse of single-chip microcomputer process, the digit pulse of this rule just draws pulses measure numerical value for single-chip microcomputer process.
But, adopt pulse detecting device that photosensitive principle carries out detecting when specifically testing in prior art, because human finger exists individual variation, the individual finger muscles of some human body is abundant, form is comparatively thick, light transmission relative mistake, now optical receiver (usually adopting phototriode) detects and exports effective pulse signal amplitude change (normally amplitude decline), shaping circuit is difficult to effectively process it, shaping circuit is often caused to output signal as full low level (digit pulse representing pulse speed disappears), the intelligent chips such as single-chip microcomputer cannot process further, this just causes the measurement fault caused because human body Individual differences causes.
Utility model content
For prior art above shortcomings, the purpose of this utility model is: how to provide a kind of compare shaping circuit based on self adaptation can the pulse test meter of measurement fault that causes due to human body Individual differences of automatic calibration.
To achieve these goals, this utility model have employed following technical scheme.
Compare a pulse test meter for shaping circuit based on self adaptation, comprise single-chip microcomputer, light emitting diode, phototriode and self adaptation and compare shaping circuit module;
The anode of described light emitting diode is connected with positive source VDD, and the negative electrode of light emitting diode is connected to the ground by the first resistance R1 and connects; The colelctor electrode of described phototriode is connected with positive source VDD, and the emitter stage of phototriode is connected to the ground by the second resistance R2 and connects;
Described self adaptation compares shaping circuit module and forms primarily of operational amplifier OP1 and electronic potentiometer; The earth terminal of described electronic potentiometer is connected to the ground, the controlled end of electronic potentiometer is connected with the outfan of single-chip microcomputer, the high voltage end of electronic potentiometer is connected with positive source VDD, and the sliding end of electronic potentiometer is connected with the negative input end of described operational amplifier OP1; The negative input end of operational amplifier OP1 is connected to the ground by the 3rd resistance R3 and connects; The positive input terminal of described operational amplifier OP1 is connected to the ground by the first electric capacity C1 and connects, the positive input terminal of described operational amplifier OP1 is the input VIN that self adaptation compares shaping circuit module, and the outfan of described operational amplifier OP1 is the outfan VOUT that self adaptation compares shaping circuit module;
The input VIN that described self adaptation compares shaping circuit module is connected with the emitter stage of described phototriode, and the outfan VOUT that described self adaptation compares shaping circuit module is connected with the input port of single-chip microcomputer;
Described single-chip microcomputer is connected with LCD display; Single-chip microcomputer is connected with Independent keys module.
Further, described electronic potentiometer is X9312 chip, and the resistance of described 3rd resistance R3 is 10K Ω.
Compared to existing technology, this utility model tool has the following advantages:
In this utility model, the controlled end of electronic potentiometer is connected with the outfan of single-chip microcomputer, the high voltage end of electronic potentiometer is connected with positive source VDD, the sliding end of electronic potentiometer is connected with the negative input end of operational amplifier OP1, and the negative input end of electronic potentiometer is also connected to the ground by the 3rd resistance R3 and connects, therefore, in fact electronic potentiometer constitutes a partial-pressure structure of connecting with the 3rd resistance R3, and the current potential of the negative input end of operational amplifier OP1 is determined by the ratio of electronic potentiometer and the 3rd resistance R3.
The above circuit structure of base, when tested human finger is comparatively thick, muscle is abundant, and light transmission is poor, thus when causing photoelectric testing sensor output signal level amplitude to reduce (signal intensity dies down), the signal level amplitude that the positive input terminal of operational amplifier OP1 receives reduces, single-chip microcomputer controls the controlled end of electronic potentiometer by its delivery outlet, revise electronic potentiometer resistance thus adjust ratio between electronic potentiometer and the 3rd resistance R3, just can realize adjusting the current potential of the negative input end of operational amplifier OP1, electronic potentiometer resistance is such as made to become large, then to get voltage large for electronic potentiometer, 3rd resistance R3 divides voltage is little, the current potential of the negative input end of operational amplifier OP1 just reduces, that is to say that the comparison reference potential terminal voltage comparing shaping circuit declines, photoelectric testing sensor output signal (when the comparatively thick signal intensity that causes of tested human finger dies down) matches with the reference potential that compares after decline, still the digit pulse containing pulse information can be exported.
Therefore it compares reference potential can not to do accommodation according to human body individual variation with shaping circuit in prior art, shaping circuit can not export the digit pulse that represents pulse information and export lasting low level, and then cause and measure the technology status of fault and compare, this utility model has can the advantage of measurement fault that causes due to human body Individual differences of automatic calibration.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model;
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is described in further detail.
As shown in Figure 1, a kind of pulse test meter comparing shaping circuit based on self adaptation mainly comprises three partial circuits: (1) photosensor part; (2) comparator module part; (3) Single-chip Controlling core.
(1) photosensor part adopts following structure usually: photoelectric sensor adopts light emitting diode and phototriode composition; The anode of light emitting diode is connected with positive source VDD, and the negative electrode of light emitting diode is connected to the ground by the first resistance R1 and connects;
The colelctor electrode of phototriode is connected with positive source VDD, and the emitter stage of phototriode is connected to the ground by the second resistance R2 and connects, and the emitter stage of phototriode is the signal output part of photoelectric sensor.Light emitting diode selects red light-emitting diode.
(2) comparator module part: this utility model devises a kind of self adaptation and compares shaping circuit module, and structure is as follows: form primarily of operational amplifier OP1 and electronic potentiometer; The earth terminal of electronic potentiometer is connected to the ground, and the controlled end of electronic potentiometer is connected with the outfan of single-chip microcomputer, and the high voltage end of electronic potentiometer is connected with positive source VDD, and the sliding end of electronic potentiometer is connected with the negative input end of described operational amplifier OP1; The negative input end of operational amplifier OP1 is connected to the ground by the 3rd resistance R3 and connects; The positive input terminal of operational amplifier OP1 is connected to the ground by the first electric capacity C1 (using as filter capacitor) and connects, the positive input terminal of described operational amplifier OP1 is the input VIN that self adaptation compares shaping circuit module, and the outfan of described operational amplifier OP1 is the outfan VOUT that self adaptation compares shaping circuit module; Electronic potentiometer is X9312 chip, and the resistance of the 3rd resistance R3 is 10K Ω.
X9312 is 100 rank digital regulation resistances, and maximum value is 100K Ω, and this electronic potentiometer has following pin: " increase input pin
", " lifting input pin
", " hot end VH ", " cold end VL ", " hold VSS ", " sliding end VW " and " sheet selects input
", wherein " increase input pin
", " lifting input pin
" be two controlled ends of electronic potentiometer.
The physical circuit annexation of electronic potentiometer is as follows: two controlled ends of electronic potentiometer (increase input pin
lifting input pin
) be all connected with the outfan of single-chip microcomputer, the high voltage end VH of electronic potentiometer is connected with positive source VDD, and the earth terminal VSS of electronic potentiometer is connected to the ground, and the sliding end VW of electronic potentiometer is connected with the negative input end of operational amplifier OP1.
(3) Single-chip Controlling core: adopt MSP430G2553 chip.
Electrical connection between three partial circuits is as follows:
The signal output part (that is to say the emitter stage of phototriode) of photoelectric sensor compares shaping circuit module input VIN (that is to say the positive input terminal of operational amplifier OP1) and is connected with self adaptation;
The outfan VOUT (that is to say the outfan of operational amplifier 0P1) that self adaptation compares shaping circuit module is connected with the input port of the Part III Single-chip Controlling core of pulse test meter; Single-chip microcomputer is connected with LCD display; Single-chip microcomputer is connected with Independent keys module.
This utility model pulse test meter work process is as follows:
(1) during common working condition:
During concrete measurement, red light-emitting diode and phototriode form a detection photoelectric sensor, during use, the finger of tested human body is placed between red light-emitting diode and phototriode, in blood vessel, the change of blood saturation can cause the transfer strength of light to change, phototriode is made to export the pulse signal corresponding with heart beating beat, the about 3.3V of high level of this pulse, the about 1.1V of low level.This pulse exports from the emitter stage of phototriode.Its ultimate principle is that the light that phototriode receives is strong, then conducting degree is high, and the emitter stage of phototriode obtains high impulse, and the light that phototriode receives is weak, then conducting degree is low, and the emitter stage of phototriode obtains low pulse.When certain reality uses, red light-emitting diode and phototriode all will be arranged in a lighttight body, during test, point and will stretch in body and be placed between red light-emitting diode and phototriode.
This pulse due to level value not size can not be received by single-chip I/O mouth that (MSP430G2553 single-chip microcomputer can receive the about 3.5V of high level, the digital signal of the about 0.1V of low level), therefore we need the about 3.3V of high level, and process is carried out in the photoelectric sensor output pulse of the about 1.1V of low level makes it applicable single-chip microcomputer process.
The positive input terminal of operational amplifier OP1 is sent in pulse due to phototriode output, and namely the negative input end of operational amplifier OP1 is reference potential input of the present utility model, the current potential of the negative input end of operational amplifier OP1 is determined by the ratio of electronic potentiometer and the 3rd resistance R3.As fixing normal mode, the resistance of electronic potentiometer is set in 10K Ω by single-chip microcomputer, and the ratio set of electronic potentiometer and the 3rd resistance R3 is 1: 1.
Concrete how to set the process of electronic potentiometer resistance about single-chip microcomputer as follows: increase input pin
triggered by trailing edge, the direction making sliding end VW towards internal counter increase or reduction is moved by the trailing edge that this pin occurs, lifting input pin
on logic level control the direction of electronic potentiometer sliding end VW movement; Increase input pin
with lifting input pin
signal provide by single-chip microcomputer, therefore single-chip microcomputer can realize revising the control of electronic potentiometer resistance,
The ratio set of electronic potentiometer and the 3rd resistance R3 is 1: 1, if then system power source voltage VDD is 3.6V, then reference potential is 1.8V, after operational amplifier OP1 is sent in the pulse that phototriode exports, it is 1.8V that its high level part (about 3.3V) is greater than reference potential, and therefore the outfan of operational amplifier 0P1 will export the high level of about 3.5V; It is 1.8V that the low level part (about 1.1V) of the pulse that phototriode exports is less than reference potential, therefore the outfan of operational amplifier 0P1 will export the low level of about 0.1V, and therefore the outfan of operational amplifier 0P1 will export the digital signal that can be used for single-chip microcomputer process.And obviously the pulse of phototriode output and the pulse after comparator module process are synchronous.
The pulse that single-chip microcomputer exports according to operational amplifier 0P1 just can count human pulse, thus realizes pulse test.Certain test data can show on an lcd display, and Independent keys also can be used to carry out the controls such as model selection to single-chip microcomputer.
(2) when there is individual variation situation:
Because human finger exists individual variation, the individual finger muscles of some human body is abundant, form is comparatively thick, light transmission relative mistake, now phototriode just can not detect and export effective pulse signal for intelligent chips such as single-chip microcomputers as detection foundation, and this just causes the measurement fault caused because human body Individual differences causes.Particularly abundant when running into the individual finger muscles of tested human body, form is comparatively thick, during light transmission relative mistake, phototriode conducting degree declines, therefore also decline from the high level amplitude of the pulse signal of phototriode emitter stage output thereupon, and may occur lower than comparison module reference potential 1.8V (that is to say operational amplifier OP1 negative input end potential value), now after comparator module process, the high level corresponding part that phototriode exports in pulse also " is scabbled " as low level, it is low level that comparator module exports entirely, without the signal edge being used to single-chip microcomputer counting, it is zero that Pulse Rate detects, this is obviously a kind of measurement fault (or mistake), the way that this utility model solves this technical problem is: namely single-chip I/O mouth controls electronic potentiometer resistance after detecting lasting low level increase, this utility model electronic potentiometer adopts X9312 chip, it is 100 rank digital regulation resistances, maximum value is 100K Ω, sliding end increment is 1010 Ω, therefore single-chip microcomputer makes electronic potentiometer resistance increase one or more gear (1010 Ω) by exporting digital controlled signal, now because electronic potentiometer resistance increases, then to get voltage large for electronic potentiometer, 3rd resistance R3 divides voltage is little, the current potential of the negative input end of operational amplifier OP1 just reduces, that is to say that the comparison reference potential terminal voltage comparing shaping circuit declines (lowering on the basis of former 1.8V), photoelectric testing sensor output signal (when the comparatively thick signal intensity that causes of tested human finger dies down) matches with the reference potential that compares after decline, still the digit pulse containing pulse information can be exported.The pulse that single-chip microcomputer exports according to operational amplifier 0P1 just can count human pulse, thus realizes pulse test.
Finally illustrate, above embodiment is only in order to illustrate technical side of the present utility model.Case and unrestricted, although be described in detail this utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (2)
1. compare a pulse test meter for shaping circuit based on self adaptation, it is characterized in that: comprise single-chip microcomputer, light emitting diode, phototriode and self adaptation and compare shaping circuit module;
The anode of described light emitting diode is connected with positive source VDD, and the negative electrode of light emitting diode is connected to the ground by the first resistance R1 and connects; The colelctor electrode of described phototriode is connected with positive source VDD, and the emitter stage of phototriode is connected to the ground by the second resistance R2 and connects;
Described self adaptation compares shaping circuit module and forms primarily of operational amplifier OP1 and electronic potentiometer; The earth terminal of described electronic potentiometer is connected to the ground, the controlled end of electronic potentiometer is connected with the outfan of single-chip microcomputer, the high voltage end of electronic potentiometer is connected with positive source VDD, and the sliding end of electronic potentiometer is connected with the negative input end of described operational amplifier OP1; The negative input end of operational amplifier OP1 is connected to the ground by the 3rd resistance R3 and connects; The positive input terminal of described operational amplifier OP1 is connected to the ground by the first electric capacity C1 and connects, the positive input terminal of described operational amplifier OP1 is the input VIN that self adaptation compares shaping circuit module, and the outfan of described operational amplifier OP1 is the outfan VOUT that self adaptation compares shaping circuit module;
The input VIN that described self adaptation compares shaping circuit module is connected with the emitter stage of described phototriode, and the outfan VOUT that described self adaptation compares shaping circuit module is connected with the input port of single-chip microcomputer;
Described single-chip microcomputer is connected with LCD display; Single-chip microcomputer is connected with Independent keys module.
2. a kind of pulse test meter comparing shaping circuit based on self adaptation according to claim 1, is characterized in that, described electronic potentiometer is X9312 chip, and the resistance of described 3rd resistance R3 is 10K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860535.1U CN204636340U (en) | 2014-12-23 | 2014-12-23 | A kind of pulse test meter comparing shaping circuit based on self adaptation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860535.1U CN204636340U (en) | 2014-12-23 | 2014-12-23 | A kind of pulse test meter comparing shaping circuit based on self adaptation |
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| CN204636340U true CN204636340U (en) | 2015-09-16 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105326480A (en) * | 2015-11-09 | 2016-02-17 | 沈阳大学 | Photoelectric reflecting type pulse heart rate collecting device with changeable output threshold |
| CN107102374A (en) * | 2017-04-28 | 2017-08-29 | 达特电子（上海）有限公司 | Tray detecting device |
-
2014
- 2014-12-23 CN CN201420860535.1U patent/CN204636340U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105326480A (en) * | 2015-11-09 | 2016-02-17 | 沈阳大学 | Photoelectric reflecting type pulse heart rate collecting device with changeable output threshold |
| CN107102374A (en) * | 2017-04-28 | 2017-08-29 | 达特电子（上海）有限公司 | Tray detecting device |
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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 |
Granted publication date: 20150916 Termination date: 20171223 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |