CN204445864U - A kind of photo-electric cardiotachometer circuit - Google Patents
A kind of photo-electric cardiotachometer circuit Download PDFInfo
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- CN204445864U CN204445864U CN201420860348.3U CN201420860348U CN204445864U CN 204445864 U CN204445864 U CN 204445864U CN 201420860348 U CN201420860348 U CN 201420860348U CN 204445864 U CN204445864 U CN 204445864U
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Abstract
The utility model discloses a kind of photo-electric cardiotachometer circuit, comprise photoelectric sensor circuit, the preamplifying circuit be connected with photoelectric sensor circuit, the rear class amplifying circuit be connected with preamplifying circuit, the comparator circuit be connected with rear class amplifying circuit, the master control control circuit be connected with comparator amplifying circuit and the LCD segment encode that is connected with master control control circuit shields circuit and buzzer circuit, photoelectric sensor circuit is for gathering photosignal; Preamplifying circuit is used for the signal of collection being carried out amplification and exports; Rear class amplifying circuit is used for that the signal that preamplifying circuit exports is carried out amplification and exports; Comparator circuit for receiving amplifying signal, and produces periodic level signal through conversion; Master control control circuit obtains heart rate value after the level signal of collection being processed; LCD segment encode screen circuit is by driving display heart rate value, and buzzer circuit is by driving with heart rate periodically ring.This utility model circuit is simple, provides high performance-price ratio photoelectricity heart rate detection scheme.
Description
Technical field
This utility model belongs to a kind of circuit of photo-electric cardiotachometer.
Background technology
Existing cardiotachometer is adopt physical pressure sensor mostly, use inconvenience, and existing photo-electric cardiotachometer is substantially all design according to photoplethysmographic tracing principle, namely the light beam irradiation of certain wavelength is to finger tip skin surface, light beam is sent to photelectric receiver by transmission or reflection, volumetric blood in skin is the change in pulsation under key role, the light intensity that optical receiver the is received change in pulsating nature thereupon, convert this intensity variation signal to the signal of telecommunication, just can obtain the change of pulse blood.But the peripheral circuit of most of photo-electric cardiotachometer is complicated, poor robustness is with high costs.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of circuit simple, the lower-cost photo-electric cardiotachometer circuit provided.
For achieving the above object, this utility model adopts following technical proposals:
A kind of photo-electric cardiotachometer circuit, comprises
Photoelectric sensor circuit, described photoelectric sensor circuit is for gathering photosignal;
The preamplifying circuit be connected with described photoelectric sensor circuit, described preamplifying circuit is used for the signal of collection being carried out amplification and exports;
The rear class amplifying circuit be connected with described preamplifying circuit, the signal that described rear class amplifying circuit is used for being exported by described preamplifying circuit carries out amplification and exports;
The comparator circuit be connected with described rear class amplifying circuit, described comparator circuit for receiving amplifying signal, and produces periodic level signal through conversion;
The master control control circuit be connected with described comparator amplifying circuit, described master control control circuit obtains heart rate value after the level signal of collection being processed;
The LCD segment encode be connected with described master control control circuit shields circuit and buzzer circuit, and described LCD segment encode screen circuit is by driving display heart rate value, and described buzzer circuit is by driving with heart rate periodically ring.
Described photoelectric sensor circuit comprises a photoelectric sensor, the 9th resistance, the 10th resistance, load resistance and an electric capacity, the LED1+ pin of described photoelectric sensor connects one end of described 10th resistance, its LED2+ pin connects one end of described 9th resistance, 10th resistance is connected power supply with the other end of the 9th resistance, LED-and the GND pin ground connection of photoelectric sensor, its VCC pin is by described capacity earth, its output pin connects one end of described load resistance and described preamplifying circuit, the other end ground connection of load resistance.
Described preamplifying circuit comprises an operational amplifier, and the in-phase input end of described operational amplifier connects one end of the 17th resistance, the 20th resistance and the 14th electric capacity, the other end ground connection of the 17th resistance and the 14th electric capacity, and the other end of the 20th resistance connects power supply;
The inverting input of described operational amplifier connects one end of input resistance, feedback resistance and feedback capacity, the other end of input resistance connects described photoelectric sensor circuit by capacitance, the outfan of the other end concatenation operation amplifier of feedback resistance and feedback capacity, the outfan of operational amplifier also connects described rear class amplifying circuit, the earth terminal ground connection of described operational amplifier, its power end connects power supply.
Rear class amplifying circuit comprises an operational amplifier, and the in-phase input end of operational amplifier connects one end of the 24th resistance, the 25th resistance and the 18th electric capacity, the other end ground connection of the 24th resistance and the 18th electric capacity, and the other end of the 25th resistance connects power supply;
The inverting input of operational amplifier connects one end of the 23rd resistance, the 26th resistance and the 19th electric capacity, the other end of the 23rd resistance connects preamplifying circuit by the 9th electric capacity, the outfan of the other end concatenation operation amplifier of the 26th resistance and the 19th electric capacity, the outfan of operational amplifier also connects comparator circuit, the earth terminal ground connection of operational amplifier, its power end connects power supply.
Described comparator circuit comprises a dual operational amplifier, and described dual operational amplifier comprises and is integrated in follower on a monolithic and comparator;
The in-phase input end of described follower connects one end of described rear class amplifying circuit and the 12nd resistance, the other end of the 12nd resistance connects the in-phase input end of described comparator and one end of the 18th resistance, and the other end of described 18th resistance connects the outfan of described comparator.
The inverting input of described follower connects the outfan of described follower, the outfan of described follower connects one end of the 7th electric capacity and the 11st resistance, 7th electric capacity is connected the inverting input of comparator and one end of the 13rd electric capacity with the other end of the 11st resistance, the other end ground connection of the 13rd electric capacity, the outfan of described comparator connects described master control control circuit.
Described master control control circuit comprises a MCU, and described MCU connects one end of the outfan of described comparator circuit, button and the 2nd resistance and the 2nd electric capacity respectively, and the other end of described 2nd resistance connects power supply, the other end ground connection of described 2nd electric capacity.
Described buzzer circuit comprises audion, diode, buzzer, current-limiting resistance, the 4th resistance and the 6th resistance, the base stage of described audion connects one end of the 4th resistance and the 6th resistance, the other end of the 4th resistance connects master control control circuit, the other end of the 6th resistance and the grounded emitter of audion, the colelctor electrode of described audion connects the anode of described diode and 2 feet of buzzer, 3 feet of buzzer and 4 foot ground connection, 1 foot of buzzer and the negative electrode of diode connect one end of current-limiting resistance, and the other end of current-limiting resistance connects power supply.
After adopting technique scheme, compared with prior art, tool has the following advantages this utility model:
1, this utility model provides high performance-price ratio photoelectricity heart rate detection scheme, and stability is high, and volume is little, low in energy consumption, can be used for multiple intelligence and dresses solution.
2, hardware circuit is simple, and only need a MCU to add 1 sensor and 2 amplifiers, be converted to level signal through comparator, capacity of resisting disturbance is strong.
3, software simulating is simple, without the need to complicated algorithm.
Accompanying drawing explanation
Fig. 1 is circuit of the present utility model composition schematic diagram;
Fig. 2 is the circuit diagram of photoelectric sensor circuit;
Fig. 3 is the circuit diagram of preamplifying circuit;
Fig. 4 is the circuit diagram of rear class amplifying circuit;
Fig. 5 is the circuit diagram of comparator circuit;
Fig. 6 is the circuit diagram of master control control circuit;
Fig. 7 is the schematic diagram of LCD segment encode screen circuit;
Fig. 8 is the circuit diagram of buzzer circuit
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain this utility model, and be not used in restriction this utility model.
As shown in Figure 1, a kind of photo-electric cardiotachometer circuit, comprise photoelectric sensor circuit 1, preamplifying circuit 2, rear class amplifying circuit 3, comparator circuit 4, master control control circuit 5, LCD segment encode screen circuit 6 and buzzer circuit 7, photoelectric sensor circuit 1, preamplifying circuit 2, rear class amplifying circuit 3, comparator circuit 4 and master control control circuit 5 are connected successively, and master control control circuit 5 also shields circuit 6 with LCD segment encode respectively and buzzer circuit 7 is connected.
As shown in Figure 2, photoelectric sensor circuit 1 comprises photoelectric sensor U2, 9th resistance R9, 10th resistance R10, load resistance R19 and electric capacity C10, the LED1+ pin of photoelectric sensor U2 connects one end of the 10th resistance R10, the LED2+ pin of photoelectric sensor U2 connects one end of the 9th resistance R9, 10th resistance R10 is connected power supply VBAT with the other end of the 9th resistance R9, the LED-pin of photoelectric sensor U2 and GND pin ground connection, the VCC pin of photoelectric sensor U2 is by electric capacity C10 ground connection, VOUT output pin connects one end and the preamplifying circuit 2 of load resistance R19, the other end ground connection of load resistance R19.
Photoelectric sensor circuit 1 is for gathering photosignal, and signal inputs to preamplifying circuit 2 after load resistance R19.
As shown in Figure 3, preamplifying circuit 2 comprises operational amplifier U3, the in-phase input end (IN+) of operational amplifier U3 connects one end of the 17th resistance R17, the 20th resistance R20 and the 14th electric capacity C14, the other end ground connection of the 17th resistance R17 and the 14th electric capacity C14, the other end of the 20th resistance R20 connects power supply VBAT;
The inverting input (IN-) of operational amplifier U3 connects one end of input resistance R14, feedback resistance R8 and feedback capacity C6, the other end of input resistance R14 connects photoelectric sensor circuit 1 by capacitance C8, the outfan (OUT) of the other end concatenation operation amplifier U3 of feedback resistance R8 and feedback capacity C6, the outfan (OUT) of operational amplifier U3 also connects rear class amplifying circuit 3, earth terminal (GND) ground connection of operational amplifier U3, its power end (VCC) connects power supply VBAT.
As shown in Figure 4, the circuit structure of rear class amplifying circuit 3 is identical with preamplifying circuit 2, specifically comprise operational amplifier U5, the in-phase input end (IN+) of operational amplifier U5 connects one end of the 24th resistance R24, the 25th resistance R25 and the 18th electric capacity C18, the other end ground connection of the 24th resistance R24 and the 18th electric capacity C18, the other end of the 25th resistance R25 connects power supply VBAT;
The inverting input (IN-) of operational amplifier U5 connects one end of the 23rd resistance R23, the 26th resistance R26 and the 19th electric capacity C19, the other end of the 23rd resistance R23 connects preamplifying circuit 2 by the 9th electric capacity C9, the outfan (OUT) of the other end concatenation operation amplifier U5 of the 26th resistance R26 and the 19th electric capacity C19, the outfan (OUT) of operational amplifier U5 also connects comparator circuit 4, earth terminal (GND) ground connection of operational amplifier U5, its power end (VCC) connects power supply VBAT.
Signal is input to the inverting input of prime amplifier through capacitance C8, and input resistance R14 and feedback resistance R8 determines gain G ain=-R8/R 14; Feedback capacity C6 prevents self-excitation and spike; R17, R20 and C14 provide amplifier to be biased, resistance R17 and resistance R20 dividing potential drop produce 1/2VBAT, provide mid point bias voltage to the in-phase end of amplifier, each device function of rear class amplifier is identical with prime, and photosignal is input comparator circuit 4 after prime and rear class are amplified.
As shown in Figure 5, comparator circuit 4 comprises a dual operational amplifier U4, dual operational amplifier is that two universal operational amplifiers are integrated on a monolithic, wherein the amplifier of 1 foot of dual operational amplifier U4,2 feet and 3 feet composition is follower, and the amplifier be made up of 5 feet, 6 feet and 7 feet is comparator.
The in-phase input end (INA+) of follower connects one end of rear class amplifying circuit 3 and the 12nd resistance R12, the other end of the 12nd resistance R12 connects the in-phase input end (INB+) of comparator and one end of the 18th resistance R18, and the other end of the 18th resistance R18 connects the outfan (OUTB) of comparator.The inverting input (INA-) of follower connects the outfan (OUTA) of follower, the outfan (OUTA) of follower connects one end of the 7th electric capacity C7 and the 11st resistance R11,7th electric capacity C7 is connected the inverting input (INB-) of comparator and one end of the 13rd electric capacity C13 with the other end of the 11st resistance R11, the other end ground connection of the 13rd electric capacity C13, the outfan (OUTB) of comparator connects master control control circuit 5.
Signal input dual operational amplifier U4 after amplification produces level signal, follower provides reference voltage to comparator after R11 and C13 filtering, signal is input to the in-phase input end of comparator through R12, R18 increases positive feedback can signal for faster edge, eliminate low frequency signal through the burr of out-of-date generation and vibration, through the level signal input master control control circuit 5 that double operational produces.
As shown in Figure 6, master control control circuit 5 comprises the MCU that a model is STM8L152,29 pins of MCU connect the outfan (OUTB) of comparator circuit 4,47 pins of MCU connect button SW1,2 pins of MCU connect the reset circuit of the 2nd resistance R2 and the 2nd electric capacity C2 composition, be specially one end that 2 pins connect the 2nd resistance R2 and the 2nd electric capacity C2 respectively, the other end of the 2nd resistance R2 connects power supply VBAT, the other end ground connection of the 2nd electric capacity C2.
Be illustrated in figure 7 the schematic diagram of LCD segment encode screen circuit 6, pin COM0 ~ COM03, the SEG0 ~ SEG7 of its LCD display J1 are connected with the respective pins of MCU respectively.
As shown in Figure 8, buzzer circuit 7 comprises audion Q1, diode D2, buzzer J2, current-limiting resistance R1, 4th resistance R4 and the 6th resistance R6, the base stage of audion Q1 connects one end of the 4th resistance R4 and the 6th resistance R6, the other end of the 4th resistance R4 connects master control control circuit by ST_LINK_SWIM end, the other end ground connection of the 6th resistance R6, the grounded emitter of audion Q1, the colelctor electrode of audion Q1 connects the anode of diode D2 and 2 feet of buzzer J2, 3 feet of buzzer J2 and 4 foot ground connection, 1 foot of buzzer J2 and the negative electrode of diode D2 connect one end of current-limiting resistance R1, the other end of current-limiting resistance R1 connects power supply VBAT.4th resistance R4, the 6th resistance R6, audion Q1 form on-off control and Current amplifier, and diode D2 prevents from audion Q1 from closing buzzer J2 back discharge of having no progeny puncturing audion Q1.
MCU collection level signal is carried out calculation process and is drawn heart rate value, drives LCD segment encode screen circuit 6 to show heart rate value on LCD, controls buzzer circuit 7 simultaneously, makes buzzer J2 along with heart rate periodically ring.During use, point and put by face on a sensor motionless, power on and can show instantaneous heart rate value on LCD segment encode screen, buzzer simultaneously also can along with heart rate ring.
The above; be only this utility model preferably detailed description of the invention; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that this utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (7)
1. a photo-electric cardiotachometer circuit, is characterized in that: comprise
Photoelectric sensor circuit, described photoelectric sensor circuit is for gathering photosignal;
The preamplifying circuit be connected with described photoelectric sensor circuit, described preamplifying circuit is used for the signal of collection being carried out amplification and exports;
The rear class amplifying circuit be connected with described preamplifying circuit, the signal that described rear class amplifying circuit is used for being exported by described preamplifying circuit carries out amplification and exports;
The comparator circuit be connected with described rear class amplifying circuit, described comparator circuit for receiving amplifying signal, and produces periodic level signal through conversion;
The master control control circuit be connected with described comparator amplifying circuit, described master control control circuit obtains heart rate value after the level signal of collection being processed;
The LCD segment encode be connected with described master control control circuit shields circuit and buzzer circuit, and described LCD segment encode screen circuit is by driving display heart rate value, and described buzzer circuit is by driving with heart rate periodically ring.
2. a kind of photo-electric cardiotachometer circuit according to claim 1, it is characterized in that: described photoelectric sensor circuit comprises a photoelectric sensor, 9th resistance, 10th resistance, load resistance and an electric capacity, the LED1+ pin of described photoelectric sensor connects one end of described 10th resistance, its LED2+ pin connects one end of described 9th resistance, 10th resistance is connected power supply with the other end of the 9th resistance, LED-and the GND pin ground connection of photoelectric sensor, its VCC pin is by described capacity earth, its output pin connects one end of described load resistance and described preamplifying circuit, the other end ground connection of load resistance.
3. a kind of photo-electric cardiotachometer circuit according to claim 2, it is characterized in that: described preamplifying circuit comprises an operational amplifier, the in-phase input end of described operational amplifier connects one end of the 17th resistance, the 20th resistance and the 14th electric capacity, the other end ground connection of the 17th resistance and the 14th electric capacity, the other end of the 20th resistance connects power supply;
The inverting input of described operational amplifier connects one end of input resistance, feedback resistance and feedback capacity, the other end of input resistance connects described photoelectric sensor circuit by capacitance, the outfan of the other end concatenation operation amplifier of feedback resistance and feedback capacity, the outfan of operational amplifier also connects described rear class amplifying circuit, the earth terminal ground connection of described operational amplifier, its power end connects power supply.
4. a kind of photo-electric cardiotachometer circuit according to claim 3, it is characterized in that: described rear class amplifying circuit comprises an operational amplifier, the in-phase input end of operational amplifier connects one end of the 24th resistance, the 25th resistance and the 18th electric capacity, the other end ground connection of the 24th resistance and the 18th electric capacity, the other end of the 25th resistance connects power supply;
The inverting input of operational amplifier connects one end of the 23rd resistance, the 26th resistance and the 19th electric capacity, the other end of the 23rd resistance connects preamplifying circuit by the 9th electric capacity, the outfan of the other end concatenation operation amplifier of the 26th resistance and the 19th electric capacity, the outfan of operational amplifier also connects comparator circuit, the earth terminal ground connection of operational amplifier, its power end connects power supply.
5. a kind of photo-electric cardiotachometer circuit according to claim 4, is characterized in that: described comparator circuit comprises a dual operational amplifier, and described dual operational amplifier comprises and is integrated in follower on a monolithic and comparator;
The in-phase input end of described follower connects one end of described rear class amplifying circuit and the 12nd resistance, the other end of the 12nd resistance connects the in-phase input end of described comparator and one end of the 18th resistance, and the other end of described 18th resistance connects the outfan of described comparator.
The inverting input of described follower connects the outfan of described follower, the outfan of described follower connects one end of the 7th electric capacity and the 11st resistance, 7th electric capacity is connected the inverting input of comparator and one end of the 13rd electric capacity with the other end of the 11st resistance, the other end ground connection of the 13rd electric capacity, the outfan of described comparator connects described master control control circuit.
6. a kind of photo-electric cardiotachometer circuit according to claim 5, it is characterized in that: described master control control circuit comprises a MCU, described MCU connects one end of the outfan of described comparator circuit, button and the 2nd resistance and the 2nd electric capacity respectively, the other end of described 2nd resistance connects power supply, the other end ground connection of described 2nd electric capacity.
7. a kind of photo-electric cardiotachometer circuit according to claim 6, it is characterized in that: described buzzer circuit comprises audion, diode, buzzer, current-limiting resistance, 4th resistance and the 6th resistance, the base stage of described audion connects one end of the 4th resistance and the 6th resistance, the other end of the 4th resistance connects master control control circuit, the other end of the 6th resistance and the grounded emitter of audion, the colelctor electrode of described audion connects the anode of described diode and 2 feet of buzzer, 3 feet of buzzer and 4 foot ground connection, 1 foot of buzzer and the negative electrode of diode connect one end of current-limiting resistance, the other end of current-limiting resistance connects power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420860348.3U CN204445864U (en) | 2014-12-30 | 2014-12-30 | A kind of photo-electric cardiotachometer circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420860348.3U CN204445864U (en) | 2014-12-30 | 2014-12-30 | A kind of photo-electric cardiotachometer circuit |
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| CN204445864U true CN204445864U (en) | 2015-07-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801847A (en) * | 2018-06-23 | 2018-11-13 | 蚌埠赛英电子科技发展有限公司 | The mating mud density harvester of wireless composite logging |
| CN109984737A (en) * | 2019-03-07 | 2019-07-09 | 江西科技学院 | Heartbeat detection device |
| CN110308827A (en) * | 2019-07-19 | 2019-10-08 | 北京科加触控技术有限公司 | A kind of infrared circuit, E-pen position condition checkout gear and apparatus for writing |
-
2014
- 2014-12-30 CN CN201420860348.3U patent/CN204445864U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801847A (en) * | 2018-06-23 | 2018-11-13 | 蚌埠赛英电子科技发展有限公司 | The mating mud density harvester of wireless composite logging |
| CN109984737A (en) * | 2019-03-07 | 2019-07-09 | 江西科技学院 | Heartbeat detection device |
| CN110308827A (en) * | 2019-07-19 | 2019-10-08 | 北京科加触控技术有限公司 | A kind of infrared circuit, E-pen position condition checkout gear and apparatus for writing |
| CN110308827B (en) * | 2019-07-19 | 2024-02-06 | 北京科加触控技术有限公司 | Infrared detection circuit, electronic pen position state detection device and writing equipment |
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