CN209360681U - Heart rate detection circuit and heartbeat detection device - Google Patents
Heart rate detection circuit and heartbeat detection device Download PDFInfo
- Publication number
- CN209360681U CN209360681U CN201822181619.3U CN201822181619U CN209360681U CN 209360681 U CN209360681 U CN 209360681U CN 201822181619 U CN201822181619 U CN 201822181619U CN 209360681 U CN209360681 U CN 209360681U
- Authority
- CN
- China
- Prior art keywords
- heart rate
- resistance
- capacitor
- circuit
- signal
- Prior art date
- 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.)
- Active
Links
Landscapes
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
The utility model discloses a kind of heart rate detection circuit and heartbeat detection device, wherein, power supply is heart rate sensor, heart rate signal amplifying circuit, voltage follower, trigger circuit and display circuit provide operating voltage, after the supply voltage that voltage follower exports power supply carries out voltage conversion, reference voltage is provided for heart rate signal amplifying circuit and signal amplitude amplifying circuit.Heart rate sensor measures and exports the heart rate signal measured, output to signal amplitude amplifying circuit, signal amplitude amplifying circuit carries out amplitude amplification to the heart rate signal that heart rate signal amplifying circuit exports according to reference voltage after heart rate signal is carried out voltage amplification by heart rate signal amplifying circuit.Trigger circuit exports corresponding pulse signal according to the amplified heart rate signal of amplitude, and display circuit shows the heart rate measured according to the pulse signal that trigger circuit exports.To solve the technical problem of heart rate detection circuit stability difference in the prior art.
Description
Technical field
The utility model relates to heart rate detection technical fields, in particular to heart rate detection circuit and heartbeat detection device.
Background technique
Pulse wave is propagated derived from heartbeat and from heart to peripheral arterial, form that it is showed, intensity, rate and
The integrated informations such as the rhythm and pace of moving things, largely reflect the blood characteristics of many physiological and pathologicals in cardiovascular system of human body, and heart rate is
One important physical signs, it refers to the number of heartbeat in the unit time, is the physical signs of clinical routine diagnostics.
Existing rhythm of the heart mode includes chest strap formula heart rate detection, infrared ray ear heart rate detection and the inspection of light sensation heart rate
It surveys, wherein chest strap formula heart rate detection is to detect the skin that heartbeat generates by two induction block contact chest skin on heart rate band
Current signal is emitted on wearable smart machine by the bioelectricity on skin, is converted to the corresponding heart rate size of current signal
For showing testing result.In addition, since the epidermis in the area human body Er Pang is thin, be centrifuged it is dirty close, and Internal Carotid System vertically along
Ear canal area operation, ear is at the ideal place of heart rate detection, and infrared ray ear heart rate detection is also at a kind of common heart
Rate detection mode, its working principle is that: infrared ray ear heart rate detector issues a branch of infrared light, and an infrared spectroscopy is through thin
Film enters the shallow body layer of human body and is reflected back infrared ray ear heart rate detector, and infrared ray ear heart rate detector passes through to reflection
The reception of wave can test the heart rate of user.Light sensation heart rate technical principle is that detection blood flow is by illuminating capillary
Blood vessel detects heart rate for a period of time, by sensor.But the used signal acquisition circuit of above-mentioned heart rate detection works
Stability is poor, and cost of manufacture is higher.
Utility model content
The main purpose of the utility model is to propose a kind of heart rate detection circuit, it is intended to solve heart rate detection in the prior art
The problem of circuit stability difference.
To achieve the above object, the utility model proposes a kind of heart rate detection circuit, the heart rate detection circuit includes electricity
Source, heart rate sensor, heart rate signal amplifying circuit, voltage follower, signal amplitude amplifying circuit, trigger circuit and display electricity
Road, the power supply respectively with the power input of the heart rate sensor, the heart rate signal amplifying circuit power input,
The input terminal of the power end of the trigger circuit, the input terminal of the display circuit and the voltage follower connects；The heart
The signal input part of rate signal amplification circuit is connect with the output end of the heart rate sensor, the heart rate signal amplifying circuit
Reference voltage input terminal is connect with the first output end of the voltage follower, the signal output of the heart rate signal amplifying circuit
End is connect with the signal input part of the signal amplitude amplifying circuit；The reference voltage input terminal of the signal amplitude amplifying circuit
It is connect with the second output terminal of the voltage follower, the signal output end of the signal amplitude amplifying circuit and triggering electricity
The input terminal on road connects, and the output end of the trigger circuit connect with the controlled end of the display circuit, the display circuit
Output end ground connection；
The power supply, for for the heart rate sensor, the heart rate signal amplifying circuit, the trigger circuit, described
Voltage follower and the display circuit provide operating voltage；
The voltage follower is the heart rate after the supply voltage for exporting the power supply carries out voltage conversion
Signal amplification circuit and the signal amplitude amplifying circuit provide reference voltage；
The heart rate sensor, for measuring and exporting the heart rate signal measured；
The heart rate signal amplifying circuit, for exporting after the heart rate signal is carried out voltage amplification to the signal width
Spend amplifying circuit；
The signal amplitude amplifying circuit, for what is exported according to the reference voltage to the heart rate signal amplifying circuit
The heart rate signal carries out amplitude amplification；
The trigger circuit, for exporting corresponding pulse signal according to the amplified heart rate signal of amplitude；
The display circuit, the pulse signal for being exported according to the trigger circuit show the heart rate measured.
Preferably, the heart rate sensor includes the first light emitting diode, photo resistance, first resistor and second resistance,
The first end of the first resistor is connected with the first end of the second resistance, the company of the first resistor and the second resistance
The power input that node is the heart rate sensor is connect, the second end of the first resistor and first light emitting diode
Anode connection；The minus earth of first light emitting diode；The of the first end of the photo resistance and the second resistance
The connecting node of the connection of two ends, the photo resistance and the second resistance is the output end of the heart rate sensor, the light
The second end of quick resistance is grounded.
Preferably, the heart rate signal amplifying circuit includes the first amplification module and the second amplification module, and described first puts
The first input end of big module is the signal input part of the heart rate signal amplifying circuit, and the second of first amplification module is defeated
Enter the reference voltage input terminal that end is the heart rate signal amplifying circuit, the power end of first amplification module is the heart rate
The input terminal of the power input of signal amplification circuit, the output end of first amplification module and second amplification module connects
It connects, the output end of second amplification module is the signal output end of the heart rate signal amplifying circuit.
Preferably, first amplification module includes first capacitor, the second capacitor, third capacitor, the 4th capacitor, third electricity
Resistance, the 4th resistance and the first amplifier, the first end of the first capacitor are the first input end of first amplification module, institute
The second end for stating first capacitor is connect with the positive input of first amplifier, the first capacitor and first amplification
The connecting node of device is the second input terminal of first amplification module；The reverse input end of first amplifier, described
The first end of the first end of three resistance, the first end of the 4th resistance and the 4th capacitor interconnects, first amplifier
Power end connect with the first end of the third capacitor, the connecting node of first amplifier and the third capacitor is institute
State the power end of the first amplification module, the second end and the described 4th of the output end of first amplifier, the 4th resistance
The second end of capacitor interconnects, and the connecting node of the second end of the output end of first amplifier and the 4th resistance is described
The output end of first amplification module, the ground terminal ground connection of first amplifier；The second end of the 3rd resistor and described the
The first end of two capacitors connects, and the second end of the second end of second capacitor and the third capacitor is grounded.
Preferably, second amplification module includes the 5th capacitor, the 6th capacitor, the 5th resistance, the 6th resistance and second
Amplifier, the positive input of second amplifier are the input terminal of second amplification module, second amplifier
Reverse input end, the first end of the 5th resistance, the first end of the first end of the 6th resistance and the 5th capacitor are mutual
Even, the second end interconnection of the output end of second amplifier, the second end of the 6th resistance and the 5th capacitor, it is described
The connecting node of the second end of the output end of second amplifier and the 6th resistance is the output end of second amplification module；
The first end of 6th capacitor is connect with the second end of the 5th resistance, the second end ground connection of the 6th capacitor.
Preferably, the voltage follower includes the 7th capacitor, the 8th capacitor, the 7th resistance, the 8th resistance, the 9th electricity
Resistance, the tenth resistance, eleventh resistor and third amplifier, the first end of the 7th resistance are the input of the voltage follower
End, second end, the first end of the 8th resistance, the first end of the 7th capacitor and the third of the 7th resistance are put
The positive input interconnection of big device；The second end of 8th resistance and the second end ground connection of the 7th capacitor；Described 9th
The first end of resistance is the first output end of the voltage follower, the second end of the 9th resistance, the third amplifier
Reverse input end, the third amplifier output end and the tenth resistance first end interconnection；The eleventh resistor
First end connect with the second end of the tenth resistance, the first of the second end of the eleventh resistor and the 8th capacitor
End be grounded, the controlled end of the eleventh resistor is connect with the second end of the 8th capacitor, the eleventh resistor by
The connecting node for controlling the second end of end and the 8th capacitor is the second output terminal of the voltage follower.
Preferably, the signal amplitude amplifying circuit includes twelfth resistor, thirteenth resistor and the 4th amplifier, described
The reverse input end of 4th amplifier is the reference voltage input terminal of the signal amplitude amplifying circuit, the 4th amplifier
The first end of positive input, the first end of the twelfth resistor and the thirteenth resistor interconnects, the 4th amplifier
Output end, the thirteenth resistor second end and the 9th capacitor first end interconnection, the second of the 9th capacitor
End is the signal output end of the signal amplitude amplifying circuit；The second end of the twelfth resistor is signal amplitude amplification
The signal input part of circuit.
Preferably, the trigger circuit includes first diode, the 14th resistance, the 15th resistance, the tenth capacitor and
One chip, the first end connection of the anode of the first diode, the input pin of first chip and the 14th resistance,
The connecting node of the input pin of the anode of the first diode and first chip is the input terminal of the trigger circuit, institute
State the cathode of first diode, the second end of the 14th resistance, the first end of the 15th resistance, first chip
The first supply pin and first chip second source foot interconnection, the company of the first diode and the 15th resistance
Connect the power end that node is the trigger circuit；The output pin of first chip is the output end of the trigger circuit, described
The grounding leg of first chip is grounded, the first chip select pin of first chip, the second chip select pin of first chip, described the
The second end of 15 resistance and the interconnection of the first end of the tenth capacitor, the second end ground connection of the tenth capacitor.
Preferably, the display circuit includes the 16th resistance, the second light emitting diode, the first triode and buzzer,
The grid of first triode is the controlled end of the display circuit, and the drain electrode of first triode is the display circuit
Output end, the source electrode of first triode, the first end of the 16th resistance and the buzzer first end connection；
The second end of 16th resistance is connect with the second end of the buzzer, the second end of the 16th resistance and the bee
The connecting node of the second end of ring device is the input terminal of the display circuit.
To achieve the above object, the utility model also proposes a kind of heartbeat detection device, including heart rate as described above inspection
Slowdown monitoring circuit.
The utility model is by being arranged power supply, heart rate sensor, heart rate signal amplifying circuit, voltage in heart rate detection circuit
Follower, signal amplitude amplifying circuit, trigger circuit and display circuit, wherein the power supply is the heart rate sensor, described
After heart rate signal amplifying circuit, the trigger circuit, the voltage follower and the display circuit provide operating voltage.It is first
First, after the supply voltage that the voltage follower exports the power supply carries out voltage conversion, for heart rate signal amplification electricity
Road and the signal amplitude amplifying circuit provide reference voltage, and then the heart rate sensor measures and exports the heart rate letter measured
Number, output to the signal amplitude amplifies electricity after the heart rate signal is carried out voltage amplification by the heart rate signal amplifying circuit
Road, the heart that the signal amplitude amplifying circuit exports the heart rate signal amplifying circuit according to the reference voltage therewith
Rate signal carries out amplitude amplification, and the trigger circuit exports corresponding pulse signal according to the amplified heart rate signal of amplitude, most
The display circuit shows the heart rate measured according to the pulse signal that the trigger circuit exports afterwards, in this application, passes through the heart
Rate signal amplification circuit and signal amplitude amplifying circuit carry out second level amplification to the heart rate signal measured, so that all hearts
Rate signal preserves, and so as to the stability and accuracy of the heart rate signal for ensuring to measure, then is made by voltage follower
It obtains heart rate signal and is output to trigger circuit in an appropriate form, show the heart rate measured so as to trigger display circuit.To
Solve the problems, such as that heart rate detection circuit stability is poor in the prior art.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the circuit diagram of the utility model heart rate detection circuit.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of heart rate detection circuits, poor for solving heart rate detection circuit stability in the prior art
The technical issues of.
In an embodiment of the utility model, as shown in Figure 1, a kind of heart rate detection circuit, heart rate detection circuit include
Power supply V1, heart rate sensor 101, heart rate signal amplifying circuit 102, voltage follower 103, signal amplitude amplifying circuit 104, touching
Power Generation Road 105 and display circuit 106.Power supply V1 respectively with the power input of heart rate sensor 101, heart rate signal amplifying circuit
The input of 102 power input, the power end of trigger circuit 105, the input terminal of display circuit 106 and voltage follower 103
End connection, the signal input part of heart rate signal amplifying circuit 102 are connect with the output end of heart rate sensor 101, and heart rate signal is put
The big reference voltage input terminal of circuit 102 is connect with the first output end of voltage follower 103, heart rate signal amplifying circuit 102
Signal output end connect with the signal input part of signal amplitude amplifying circuit 104.The reference electricity of signal amplitude amplifying circuit 104
Pressure input terminal is connect with the second output terminal of voltage follower 103, the signal output end of signal amplitude amplifying circuit 104 and triggering
The input terminal of circuit 105 connects, and the output end of trigger circuit 105 connect with the controlled end of display circuit 106, display circuit 106
Output end ground connection.
Wherein, power supply V1 is heart rate sensor 101, heart rate signal amplifying circuit 102, trigger circuit 105, voltage follower
103 and display circuit 106 provide operating voltage so that heart rate detection circuit start to work.Firstly, voltage follower 103 will be electric
After the supply voltage of source V1 output carries out voltage conversion, mentioned for heart rate signal amplifying circuit 102 and signal amplitude amplifying circuit 104
Supply reference voltage.Then heart rate sensor 101 measures and exports the heart rate signal measured, and heart rate signal amplifying circuit 102 is by the heart
Output is to signal amplitude amplifying circuit 104 after rate signal carries out voltage amplification, and signal amplitude amplifying circuit 104 is according to reference therewith
Voltage carries out amplitude amplification to the heart rate signal that heart rate signal amplifying circuit 102 exports, after trigger circuit 105 is amplified according to amplitude
Heart rate signal export corresponding pulse signal, last display circuit 106 is shown according to the pulse signal that trigger circuit 105 exports
The heart rate measured, in this application, by heart rate signal amplifying circuit 102 and signal amplitude amplifying circuit 104 to measuring
Heart rate signal carries out second level amplification, so that all heart rate signals preserve, so as to the heart rate signal for ensuring to measure
Stability and accuracy, then make heart rate signal be output to trigger circuit in an appropriate form by voltage follower 103
105, the heart rate measured is shown so as to trigger display circuit 106.To solve heart rate detection circuit stability in the prior art
Property difference problem.
This heart rate detection circuit is obtained for detecting heart rate and being amplified processing for subsequent process circuit identification
Signal, and the heart rate that measures is shown by display circuit 106, it is easy to use, it is stable and reliable in work, and structure is simple, system
Make at low cost, the value of promotion and popularization with higher.
Optionally, heart rate sensor 101 includes the first light emitting diode D1, photo resistance RD, first resistor R1 and second
The first end of resistance R2, first resistor R1 are connected with the first end of second resistance R2, the company of first resistor R1 and second resistance R2
Connect the power input that node is heart rate sensor 101, the anode of the second end of first resistor R1 and the first light emitting diode D1
Connection；The minus earth of first light emitting diode D1；The first end of photo resistance RD is connect with the second end of second resistance R2, light
The connecting node of quick resistance RD and second resistance R2 is the output end of heart rate sensor 101, the second end ground connection of photo resistance RD.
Wherein, the voltage of power supply V1 provides stable work electricity after first resistor R1 current limliting to the first light emitting diode D1
Stream, makes the first light emitting diode D1 issue the infrared light of intensity constant, and the first light emitting diode D1 makes in conjunction with photo resistance RD
With, can be convenient to be converted to all changes in heart rate the variation of photo resistance RD resistance value, be reacted in circuit be electric current
Variation, can more precisely measure real-time changes in heart rate, it is more accurate and stablize.Optionally, the first light emitting diode D1
Infrared light-emitting diode is selected, photo resistance RD selects cadmium sulphide photoconductive cell RD, and concrete principle can be explained are as follows:
By the characteristic of infrared light it is found that infrared light can pass through human body cell, but it is not easy through blood, in this way if by finger
It is placed between light emitting diode and photo resistance RD, the infrared light that light emitting diode issues just passes through finger and is irradiated to photosensitive electricity
It hinders on RD, since the blood flow of finger medium vessels shows pulse state with the bounce of heart, is irradiated on photo resistance RD
For illumination in dynamic variation, this just makes the resistance value of photo resistance RD also show suddenly big or suddenly small variable condition.It is worth
It is noted that cadmium sulphide photoconductive cell RD and infrared light-emitting diode are only an embodiment, this programme effect is may be implemented in others
The light emitting diode and photo resistance RD of fruit should all be included, and repeat no more again.
Optionally, heart rate signal amplifying circuit 102 include the first amplification module 1021 and the second amplification module 1022, first
The first input end of amplification module 1021 is the signal input part of heart rate signal amplifying circuit 102, the first amplification module 1021
Second input terminal is the reference voltage input terminal of heart rate signal amplifying circuit 102, and the power end of the first amplification module 1021 is the heart
The power input of rate signal amplification circuit 102, the output end of the first amplification module 1021 are defeated with the second amplification module 1022
Enter end connection, the output end of the second amplification module 1022 is the signal output end of heart rate signal amplifying circuit 102.
Wherein, first amplification module 1021 and the second amplification module 1022 are set in heart rate signal amplifying circuit 102, it can be with
A variety of amplifications are carried out to the heart rate signal measured, it is ensured that signal measure and its faint is exaggerated, will not be not normal, is protected
The accuracy of the heart rate signal measured is demonstrate,proved.
Optionally, the first amplification module 1021 includes first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor
C4,3rd resistor R3, the 4th resistance R4 and the first amplifier U1, the first end of first capacitor C1 are the first amplification module 1021
First input end, the second end of first capacitor C1 are connect with the positive input of the first amplifier U1, first capacitor C1 and first
The connecting node of amplifier U1 is the second input terminal of the first amplification module 1021；The reverse input end of first amplifier U1,
The first end of the first end of three resistance R3, the first end of the 4th resistance R4 and the 4th capacitor C4 interconnects, the electricity of the first amplifier U1
Source is connect with the first end of third capacitor C3, and the connecting node of the first amplifier U1 and third capacitor C3 are the first amplification module
1021 power end, the second end interconnection of the output end of the first amplifier U1, the second end of the 4th resistance R4 and the 4th capacitor C4,
The connecting node of the second end of the output end and the 4th resistance R4 of first amplifier U1 is the output end of the first amplification module 1021,
The ground terminal of first amplifier U1 is grounded；The second end of 3rd resistor R3 is connect with the first end of the second capacitor C2, the second capacitor
The second end of C2 and the second end of third capacitor C3 are grounded.
Wherein, the 4th capacitor C4 is to inhibit inhibition capacitor added by first amplifier U1 (high-gain amplifier) self-excitation, the
Two capacitor C2 are filter capacitors, and the pulse signal picked up by heart rate sensor 101 is by photo resistance RD and second resistance R2 group
At bleeder circuit upper end output.It is coupled to the non-inverting input terminal of the first amplifier U1 through first capacitor C1, first puts at this time
The amplification factor of big device U1 is (1+R4/R3), so as to realize preferable amplification effect.
Optionally, the second amplification module 1022 includes the 5th capacitor C5, the 6th capacitor C6, the 5th resistance R5, the 6th resistance
The positive input of R6 and the second amplifier U2, the second amplifier U2 are the input terminal of the second amplification module 1022, the second amplification
The reverse input end of device U2, the first end of the 5th resistance R5, the first end of the first end of the 6th resistance R6 and the 5th capacitor C5 are mutual
Even, the second end interconnection of the output end of the second amplifier U2, the second end of the 6th resistance R6 and the 5th capacitor C5, the second amplifier
The connecting node of the second end of the output end of U2 and the 6th resistance R6 is the output end of the second amplification module 1022；6th capacitor C6
First end connect with the second end of the 5th resistance R5, the second end of the 6th capacitor C6 ground connection.
Wherein, the 5th capacitor C5 is to inhibit inhibition capacitor added by second amplifier U2 (high-gain amplifier) self-excitation, the
Six capacitor C6 are filter capacitors, and the electric current of the first amplification module 1021 output is exported to the non-inverting input terminal of the second amplifier U2,
In conjunction with the effect of the 6th resistance R6 and the 5th resistance R5 and the 5th capacitor C5, the amplification factor of the second amplifier U2 is (1 at this time
+ R6/R5), so as to realize preferable amplification effect, the 6th resistance can also be set according to the specific requirement of amplification factor
The resistance value of R6 and the 5th resistance R5.
Optionally, voltage follower 103 include the 7th capacitor C7, the 8th capacitor C8, the 7th resistance R7, the 8th resistance R8,
9th resistance R9, the tenth resistance R10, eleventh resistor R11 and third amplifier U3, the first end of the 7th resistance R7 be voltage with
With the input terminal of device 103, the second end of the 7th resistance R7, the first end of the 8th resistance R8, the first end of the 7th capacitor C7 and
The positive input of three amplifier U3 interconnects；The second end of 8th resistance R8 and the second end ground connection of the 7th capacitor C7；9th electricity
The first end for hindering R9 is the first output end of voltage follower 103, the second end of the 9th resistance R9, third amplifier U3 it is reversed
The first end of input terminal, the output end of third amplifier U3 and the tenth resistance R10 interconnects；The first end of eleventh resistor R11 with
The second end of tenth resistance R10 connects, and the second end of eleventh resistor R11 and the first end of the 8th capacitor C8 are grounded, and the tenth
The controlled end of one resistance R11 is connect with the second end of the 8th capacitor C8, the controlled end of eleventh resistor R11 and the 8th capacitor C8's
The connecting node of second end is the second output terminal of voltage follower 103.
Wherein, supply voltage is subjected to impedance transformation by the voltage after the 7th resistance R7 and the 8th resistance R8 partial pressure, from
And power supply V1 internal resistance can be reduced, then by the 9th resistance R9, the tenth resistance R10, eleventh resistor R11 respectively to the first amplification
Device U1 and third amplifier U3 provide stable reference voltage, so that it is guaranteed that the measurement accuracy of instrument.
Optionally, signal amplitude amplifying circuit 104 includes twelfth resistor R12, thirteenth resistor R13 and the 4th amplifier
The reverse input end of U4, the 4th amplifier U4 are the reference voltage input terminal of signal amplitude amplifying circuit 104, the 4th amplifier U4
Positive input, twelfth resistor R12 first end and thirteenth resistor R13 first end interconnection, the 4th amplifier U4's
The first end of output end, the second end of thirteenth resistor R13 and the 9th capacitor interconnects, and the second end of the 9th capacitor is signal amplitude
The signal output end of amplifying circuit 104；The second end of twelfth resistor R12 is the signal input part of signal amplitude amplifying circuit.
In the above-described embodiments, the voltage of the second amplifier U2 output connects the homophase input in the 4th amplifier U4 all the way
End provides bias voltage for the 4th amplifier U4, and another way introduces the 4th by twelfth resistor R12 and thirteenth resistor R13
The inverting input terminal of amplifier U4 is compared with the non-inverting input terminal input signal of the 4th amplifier U4, when dull thread irradiates
When photo resistance RD, the high level of the output end out-put supply of the 4th amplifier U4, when there is finger to be placed on above, the 4th amplification
The non-inverting input terminal input of device U4 represents the pulse of heart rate, and the 4th amplifier U4 is made to export the undersuing synchronous with heart rate,
To realize the accurate output of heart rate signal.
Optionally, trigger circuit 105 includes first diode D2, the 14th resistance R14, the 15th resistance R15, the tenth electricity
Hold C10 and the first chip IC, the first of the anode of first diode D2, the input pin 2 of the first chip IC and the 14th resistance R14
The connecting node of the input pin 2 of end connection, the anode of first diode D2 and the first chip IC is the input of trigger circuit 105
End, the cathode of first diode D2, the second end of the 14th resistance R14, first end, the first chip IC of the 15th resistance R15
The first supply pin 4 and the first chip IC second source foot 6 interconnect, the connection of first diode D2 and the 15th resistance R15
Node is the power end of trigger circuit 105.The output pin 3 of first chip IC is the output end of trigger circuit 105, the first chip IC
Grounding leg 1 be grounded, the first chip select pin 6 of the first chip IC, the second chip select pin 7 of the first chip IC, the 15th resistance R15
Second end and the interconnection of the first end of the tenth capacitor C10, the second end ground connection of the tenth capacitor C10.
Wherein, the input pin 2 of the first chip IC is low level triggering, when the input pin 2 of the first chip IC inputs low-voltage
When (negative pulse), the first chip IC is triggered, 3 output HIGH voltage of output pin of the first chip IC, at this point, the first chip IC is defeated
The pulse drive signal period that foot 3 exports out is confirmed by the 15th resistance R15 and the tenth capacitor C10, but the pulse period answers at this time
Less than the period of HR min, it is possible thereby to realize that the pulse drive signal period is synchronous with heart rate signal.Optionally, the first core
Piece IC is a monostable flipflop.
Optionally, display circuit 106 include the 16th resistance R16, the second light emitting diode D3, the first triode VT1 and
The grid of buzzer THD, the first triode VT1 are the controlled end of display circuit 106, and the drain electrode of the first triode VT1 is display
The output end of circuit 106, source electrode, the first end of the 16th resistance R16 and the first end of buzzer THD of the first triode VT1
Connection；The second end of 16th resistance R16 is connect with the second end of buzzer THD, the second end and buzzing of the 16th resistance R16
The connecting node of the second end of device THD is the input terminal of display circuit 106.
Wherein, when 3 output HIGH voltage of output pin of the first chip IC, the first triode VT1 conducting, so that second
Light emitting diode D3 shines and buzzer THD sounding, when the output pin 3 of the first chip IC exports the pulse period, the one or three pole
It the time of pipe VT1 conducting and flows through size of current and can change, so that the second light emitting diode D3 light emission luminance and buzzing
Device THD sounding speed also changes therewith, so as to come out heart rate simultaneous display.
The principles of the present invention are described in detail below in conjunction with Fig. 1:
Supply voltage carries out impedance transformation by the voltage after the 7th resistance R7 and the 8th resistance R8 partial pressure, so as to drop
Low power supply V1 internal resistance, then by the 9th resistance R9, the tenth resistance R10, eleventh resistor R11 respectively to the first amplifier U1 and the
Three amplifier U3 provide stable reference voltage.Meanwhile the voltage of power supply V1 after first resistor R1 current limliting to first shine two
Pole pipe D1 provides stable operating current, and the first light emitting diode D1 is made to issue the infrared light of intensity constant, the first light-emitting diodes
Pipe D1 is used in combination with photo resistance RD, can be convenient to be converted to all changes in heart rate the change of photo resistance RD resistance value
Change, then passes through output after photo resistance RD and second resistance R2 partial pressure output to first capacitor C1 coupling to the first amplifier U1
Non-inverting input terminal, the inverting input terminal of the first amplifier U1 is reference voltage, at this point, the 4th capacitor C4 is to inhibit the first amplification
Inhibition capacitor added by device U1 (high-gain amplifier) self-excitation, the second capacitor C2 is filter capacitor, is coupled to through first capacitor C1
First amplifier U1 at this time the first amplifier U1 amplification factor be (1+R4/R3).The electric current exported through the first amplifier U1 is defeated
Out to the non-inverting input terminal of the second amplifier U2, the inverting input terminal of the second amplifier U2 is reference voltage, and the 5th capacitor C5 is
Inhibit inhibition capacitor added by second amplifier U2 (high-gain amplifier) self-excitation, the 6th capacitor C6 is filter capacitor, in conjunction with
The effect of six resistance R6 and the 5th resistance R5 and the 5th capacitor C5, the amplification factor of the second amplifier U2 is (1+R6/ at this time
R5)。
Then, the voltage of the second amplifier U2 output connects the non-inverting input terminal in the 4th amplifier U4 all the way, puts for the 4th
Big device U4 provides bias voltage, and another way introduces the anti-of the 4th amplifier U4 by twelfth resistor R12 and thirteenth resistor R13
Phase input terminal is compared with the non-inverting input terminal input signal of the 4th amplifier U4, when dull thread irradiates photo resistance RD,
The high level of the output end out-put supply of 4th amplifier U4, when there is finger to be placed on above, the 4th amplifier U4's is same mutually defeated
Enter the pulse that end input represents heart rate, the 4th amplifier U4 is made to export the undersuing synchronous with heart rate, the first chip IC
Input pin 2 is low level triggering, when the input pin 2 of the first chip IC inputs low-voltage (undersuing), the first chip IC
It is triggered, 3 output HIGH voltage of output pin of the first chip IC, at this point, the pulsed drive letter that the output pin 3 of the first chip IC exports
Number period confirms by the 15th resistance R15 and the tenth capacitor C10, but at this time the pulse period should be less than the period of HR min, by
It is synchronous with heart rate signal that the pulse drive signal period may be implemented in this.When 3 output HIGH voltage of output pin of the first chip IC, the
One triode VT1 conducting, so that the second light emitting diode D3 shines and buzzer THD sounding, it is defeated when the first chip IC
When foot 3 exports the pulse period out, the time of the first triode VT1 conducting and flows through size of current and can change, so that the
Two light emitting diode D3 light emission luminance and buzzer THD sounding speed also changes therewith, so as to go out heart rate simultaneous display
Come, the stability of the signal measured can be guaranteed by multistage amplification cooperation at this time, and pass through the triggering of the first chip IC and bee
The cooperation of ring device THD and the second light emitting diode D3, to accurately show the heart rate measured.
To achieve the above object, the utility model also proposes a kind of heartbeat detection device, including heart rate detection electricity as above
Road.
It is worth noting that, because the utility model heartbeat detection device contains all real of above-mentioned heart rate detection circuit
Example is applied, therefore the utility model heartbeat detection device has all beneficial effects of above-mentioned heart rate detection circuit, it is no longer superfluous herein
It states.
The above is only the preferred embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model, all
Under the utility model design of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of heart rate detection circuit, which is characterized in that the heart rate detection circuit includes power supply, heart rate sensor, heart rate letter
Number amplifying circuit, voltage follower, signal amplitude amplifying circuit, trigger circuit and display circuit,
The power supply power input with the power input of the heart rate sensor, the heart rate signal amplifying circuit respectively
The input terminal at end, the power end of the trigger circuit, the input terminal of the display circuit and the voltage follower connects；It is described
The signal input part of heart rate signal amplifying circuit is connect with the output end of the heart rate sensor, the heart rate signal amplifying circuit
Reference voltage input terminal connect with the first output end of the voltage follower, the signal of the heart rate signal amplifying circuit is defeated
Outlet is connect with the signal input part of the signal amplitude amplifying circuit；The reference voltage of the signal amplitude amplifying circuit inputs
End is connect with the second output terminal of the voltage follower, the signal output end of the signal amplitude amplifying circuit and the triggering
The input terminal of circuit connects, and the output end of the trigger circuit connect with the controlled end of the display circuit, the display circuit
Output end ground connection；
The power supply, for being the heart rate sensor, the heart rate signal amplifying circuit, the trigger circuit, the voltage
Follower and the display circuit provide operating voltage；
The voltage follower is the heart rate signal after the supply voltage for exporting the power supply carries out voltage conversion
Amplifying circuit and the signal amplitude amplifying circuit provide reference voltage；
The heart rate sensor, for measuring and exporting the heart rate signal measured；
The heart rate signal amplifying circuit is put for output to the signal amplitude after the heart rate signal is carried out voltage amplification
Big circuit；
The signal amplitude amplifying circuit, described in being exported according to the reference voltage to the heart rate signal amplifying circuit
Heart rate signal carries out amplitude amplification；
The trigger circuit, for exporting corresponding pulse signal according to the amplified heart rate signal of amplitude；
The display circuit, the pulse signal for being exported according to the trigger circuit show the heart rate measured.
2. heart rate detection circuit as described in claim 1, which is characterized in that the heart rate sensor includes the first light-emitting diodes
The first end of pipe, photo resistance, first resistor and second resistance, the first end of the first resistor and the second resistance connects
It connecing, the connecting node of the first resistor and the second resistance is the power input of the heart rate sensor, described first
The second end of resistance is connected with the anode of first light emitting diode；The minus earth of first light emitting diode；It is described
The first end of photo resistance is connect with the second end of the second resistance, the connection section of the photo resistance and the second resistance
Point is the output end of the heart rate sensor, the second end ground connection of the photo resistance.
3. heart rate detection circuit as described in claim 1, which is characterized in that the heart rate signal amplifying circuit is put including first
Big module and the second amplification module, the first input end of first amplification module are the signal of the heart rate signal amplifying circuit
Input terminal, the second input terminal of first amplification module are the reference voltage input terminal of the heart rate signal amplifying circuit, institute
State the first amplification module power end be the heart rate signal amplifying circuit power input, first amplification module it is defeated
Outlet is connect with the input terminal of second amplification module, and the output end of second amplification module is heart rate signal amplification
The signal output end of circuit.
4. heart rate detection circuit as claimed in claim 3, which is characterized in that first amplification module include first capacitor,
Second capacitor, third capacitor, the 4th capacitor, 3rd resistor, the 4th resistance and the first amplifier, the first end of the first capacitor
For the first input end of first amplification module, the second end of the first capacitor and the positive of first amplifier are inputted
The connecting node of end connection, the first capacitor and first amplifier is the second input terminal of first amplification module；
The reverse input end of first amplifier, the first end of the 3rd resistor, the first end of the 4th resistance and described
The first end of four capacitors interconnects, and the power end of first amplifier is connect with the first end of the third capacitor, and described first
The connecting node of amplifier and the third capacitor is the power end of first amplification module, the output of first amplifier
The second end interconnection at end, the second end of the 4th resistance and the 4th capacitor, the output end of first amplifier and institute
The connecting node for stating the second end of the 4th resistance is the output end of first amplification module, the ground terminal of first amplifier
Ground connection；The second end of the 3rd resistor is connect with the first end of second capacitor, the second end of second capacitor and institute
The second end for stating third capacitor is grounded.
5. heart rate detection circuit as claimed in claim 3, which is characterized in that second amplification module include the 5th capacitor,
The positive input of 6th capacitor, the 5th resistance, the 6th resistance and the second amplifier, second amplifier is put for described second
The input terminal of big module, the reverse input end of second amplifier, the first end of the 5th resistance, the 6th resistance
First end and the interconnection of the first end of the 5th capacitor, the second end of the output end of second amplifier, the 6th resistance
And the second end interconnection of the 5th capacitor, the connection of the output end of second amplifier and the second end of the 6th resistance
Node is the output end of second amplification module；The first end of 6th capacitor and the second end of the 5th resistance connect
It connects, the second end ground connection of the 6th capacitor.
6. heart rate detection circuit as described in claim 1, which is characterized in that the voltage follower includes the 7th capacitor, the
Eight capacitors, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and third amplifier, the 7th electricity
The first end of resistance is the input terminal of the voltage follower, the second end of the 7th resistance, the first end of the 8th resistance,
The first end of 7th capacitor and the positive input interconnection of the third amplifier；The second end of 8th resistance and institute
State the second end ground connection of the 7th capacitor；The first end of 9th resistance is the first output end of the voltage follower, described
The second end of 9th resistance, the reverse input end of the third amplifier, the third amplifier output end and the described tenth
The first end of resistance interconnects；The first end of the eleventh resistor is connect with the second end of the tenth resistance, and the described 11st
The second end of resistance and the first end of the 8th capacitor are grounded, the controlled end of the eleventh resistor and the 8th capacitor
Second end connection, the connecting node of the second end of the controlled end of the eleventh resistor and the 8th capacitor is the voltage
The second output terminal of follower.
7. heart rate detection circuit as described in claim 1, which is characterized in that the signal amplitude amplifying circuit includes the 12nd
Resistance, thirteenth resistor, the 9th capacitor and the 4th amplifier, the reverse input end of the 4th amplifier are the signal amplitude
The reference voltage input terminal of amplifying circuit, the positive input of the 4th amplifier, the first end of the twelfth resistor and
The first end of the thirteenth resistor interconnects, the output end of the 4th amplifier, the second end of the thirteenth resistor and institute
The first end interconnection of the 9th capacitor is stated, the second end of the 9th capacitor is that the signal of the signal amplitude amplifying circuit exports
End；The second end of the twelfth resistor is the signal input part of the signal amplitude amplifying circuit.
8. heart rate detection circuit as described in claim 1, which is characterized in that the trigger circuit includes first diode,
14 resistance, the 15th resistance, the tenth capacitor and the first chip, the anode of the first diode, first chip it is defeated
The first end for entering foot and the 14th resistance connects, the input pin of the anode of the first diode and first chip
Connecting node is the input terminal of the trigger circuit, the cathode of the first diode, the second end of the 14th resistance, institute
The second source foot interconnection of the first end of the 15th resistance, the first supply pin of first chip and first chip is stated,
The first diode and the connecting node of the 15th resistance are the power end of the trigger circuit；First chip
Output pin is the output end of the trigger circuit, the grounding leg ground connection of first chip, first choosing of first chip
The first end interconnection of foot, the second chip select pin of first chip, the second end of the 15th resistance and the tenth capacitor,
The second end of tenth capacitor is grounded.
9. such as the described in any item heart rate detection circuits of claim 1-8, which is characterized in that the display circuit includes the 16th
Resistance, the second light emitting diode, the first triode and buzzer, the grid of first triode be the display circuit by
End is controlled, the drain electrode of first triode is the output end of the display circuit, the source electrode of first triode, the described tenth
The first end of six resistance and the connection of the first end of the buzzer；The of the second end of 16th resistance and the buzzer
The connection of two ends, the connecting node of the second end of the second end and buzzer of the 16th resistance are the display circuit
Input terminal.
10. a kind of heartbeat detection device, which is characterized in that including the described in any item heart rate detection circuits of such as claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822181619.3U CN209360681U (en) | 2018-12-20 | 2018-12-20 | Heart rate detection circuit and heartbeat detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822181619.3U CN209360681U (en) | 2018-12-20 | 2018-12-20 | Heart rate detection circuit and heartbeat detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209360681U true CN209360681U (en) | 2019-09-10 |
Family
ID=67830886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822181619.3U Active CN209360681U (en) | 2018-12-20 | 2018-12-20 | Heart rate detection circuit and heartbeat detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209360681U (en) |
-
2018
- 2018-12-20 CN CN201822181619.3U patent/CN209360681U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102697487B (en) | System and method for using light modulation to measure physiological data | |
| CN203988032U (en) | Reflection type photoelectricity pulse wave sensor | |
| CN110236503A (en) | A kind of flexible wearable sleep physiology parameter detection method and device | |
| CN110292370A (en) | A kind of chest non-invasive blood pressure detection method based on pulse wave translation time | |
| CN106361309A (en) | Remote monitoring system for physiological parameters of human body | |
| CN108013869A (en) | A kind of blood pressure heart rate measuring system based on smart mobile phone | |
| CN103637789B (en) | Blood pressure real-time measurement apparatus | |
| CN103385711A (en) | MEMS -based human body physiological parameter detection device | |
| CN203576483U (en) | Household portable type human body physiological parameter tester | |
| CN209360681U (en) | Heart rate detection circuit and heartbeat detection device | |
| CN106691410A (en) | Pulse and red blood cell concentration monitoring instrument and method | |
| CN105054943A (en) | Oxyhemoglobin saturation detection terminal bringing convenience to monitoring | |
| CN208339499U (en) | Flexible health detection patch | |
| CN104027093B (en) | Pulse test meter and pulse test method | |
| CN110037672A (en) | Portable ABI intelligent detecting instrument | |
| CN206586954U (en) | A kind of blood oxygen saturation detector | |
| CN104490404A (en) | Cordless pulse oximeter | |
| CN208551778U (en) | A kind of fingertip pulse wave detector based on flexible PIN photodiode | |
| CN104510479A (en) | Blood oxygen acquisition system | |
| CN204351840U (en) | A kind of blood oxygen acquisition system | |
| CN211674210U (en) | Heart rate detection device and heart rate detection earphone | |
| CN204839478U (en) | Test system is rigidly spent to multisection section main artery | |
| CN203400153U (en) | Physiological parameter detection device based on MEMS | |
| CN209315861U (en) | A kind of reflective pulse rate signal detection device of anti motion interference based on optical means and pulse frequency detection device | |
| CN207477490U (en) | A kind of pulse signal acquisition system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |