CN105938082B - A kind of driving circuit and personal sampler of personal sampler - Google Patents
A kind of driving circuit and personal sampler of personal sampler Download PDFInfo
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- CN105938082B CN105938082B CN201610361257.9A CN201610361257A CN105938082B CN 105938082 B CN105938082 B CN 105938082B CN 201610361257 A CN201610361257 A CN 201610361257A CN 105938082 B CN105938082 B CN 105938082B
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- 239000003990 capacitor Substances 0.000 claims abstract description 87
- 230000005611 electricity Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims 2
- 238000005868 electrolysis reaction Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 10
- 230000008901 benefit Effects 0.000 description 4
- 206010037660 Pyrexia Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 206010037688 Q fever Diseases 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
- G01N2001/2276—Personal monitors
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Abstract
The invention discloses a kind of driving circuit of personal sampler and personal samplers, belong to electronic circuit technology field.The driving circuit includes motor, electrolytic capacitor, first capacitor, first diode, triode, first resistor, second resistance, make triode operation in the first branch of switch state and makes triode operation in the second branch of magnifying state, first capacitor is in parallel with electrolytic capacitor, the cathode of first diode and the anode of electrolytic capacitor connect, the anode of first diode is connect with the collector of triode, motor is in parallel with first diode, the emitter of triode and the cathode of electrolytic capacitor connect, one end of first resistor and the emitter of triode connect, the other end of first resistor and the base stage of triode connect, one end of second resistance and the base stage of triode connect, the first branch and second branch are connect with the other end of second resistance respectively.The present invention improves utilization rate of electrical.
Description
Technical field
The present invention relates to electronic circuit technology field, in particular to the driving circuit and personal sampling of a kind of personal sampler
Device.
Background technique
Personal sampler is a kind of detecting instrument sampled to the dust in atmospheric environment that labourer carries.Individual
Sampler is used to monitor the dust pollution journey of site for labour by departments such as safety supervision, environmental monitoring, labour protection, health and epidemic preventions
Degree is widely used in the Workplace that metallurgy, mine, casting, building materials, ceramics etc. have dust harzard.
Personal sampler include for acquire the filter of dust in dust laden air, the air pump for extracting dust laden air,
For driving circuit, the processor for controlling driving circuit etc. according to control signal driving air pump.As shown in Figure 1, existing
Driving circuit include motor MD, electrolytic capacitor E, capacitor C, diode D, triode Q and first resistor R1 and second resistance
R2.Wherein, capacitor C is in parallel with electrolytic capacitor E；The cathode of diode D is connect with the anode of electrolytic capacitor E, the anode of diode D
It is connect with the collector of triode Q, motor MD is in parallel with diode D, and the emitter of triode Q and the cathode of electrolytic capacitor E connect
It connects；One end of first resistor R1 is connect with the emitter of triode Q, and the other end of first resistor R1 and the base stage of triode Q connect
It connects, one end of second resistance R2 is connect with the base stage of triode Q, the other end incoming control signal of second resistance R2.Control letter
Number triode Q is made to work in magnifying state, the conducting degree of triode Q is controlled by control signal magnitude, changes triode Q's
Voltage between collector and the emitter of triode Q, and then change the voltage at the both ends motor MD, adjust the flow of air pump.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems:
When the flow of air pump is adjusted to lower, a large amount of electric energy of electrolytic capacitor E are all consumed in triode Q fever, are driven
The utilization rate of electrical of dynamic circuit is lower.
Summary of the invention
Utilization rate of electrical in order to solve the problems, such as prior art driving circuit is lower, and the embodiment of the invention provides one kind
The driving circuit and personal sampler of personal sampler.The technical solution is as follows:
On the one hand, the embodiment of the invention provides a kind of driving circuit of personal sampler, the driving circuit includes electricity
Machine MD, electrolytic capacitor E, first capacitor C1, first diode D1, triode Q and first resistor R1 and second resistance R2, institute
State that first capacitor C1 is in parallel with the electrolytic capacitor E, the anode of the cathode of the first diode D1 and the electrolytic capacitor E are even
It connects, the anode of the first diode D1 is connect with the collector of the triode Q, the motor MD and the first diode
D1 is in parallel, and the emitter of the triode Q is connect with the cathode of the electrolytic capacitor E, one end of the first resistor R1 and institute
The emitter connection of triode Q is stated, the other end of the first resistor R1 is connect with the base stage of the triode Q, and described second
One end of resistance R2 is connect with the base stage of the triode Q, the driving circuit further include be greater than for the voltage in battery or
When equal to given threshold, Xiang Suoshu triode Q accesses first of the control signal for making the triode Q work in switch state
Road, and for the voltage in battery be less than given threshold when, Xiang Suoshu triode Q access so that the triode Q is worked in amplification
The second branch of the control signal of state, the first branch and the second branch are another with the second resistance R2 respectively
End connection.
Optionally, the first branch includes anode the first arteries and veins of access of the second diode D2, the second diode D2
Bandwidth modulation signals PWM1 is rushed, the cathode of the second diode D2 is connect with the other end of the second resistance R2.
Optionally, the second branch includes low-pass filter circuit, voltage follower circuit and third diode D3, institute
The second pulse width modulating signal PWM2, the other end of the low-pass filter circuit and institute are accessed in the one end for stating low-pass filter circuit
The input terminal connection of voltage follower circuit is stated, the output end of the voltage follower circuit and the positive of the third diode D3 connect
It connects, the cathode of the third diode D3 is connect with the other end of the second resistance R2.
Preferably, the low-pass filter circuit includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and second
The second pulse width modulating signal PWM2 is accessed in one end of capacitor C2 and third capacitor C3, the 3rd resistor R3, described
The other end of 3rd resistor R3 is connect with one end of the 4th resistance R4, the other end and the described 5th of the 4th resistance R4
One end of resistance R5 connects, and the other end of the 5th resistance R5 is connect with the input terminal of the voltage follower, and described second
One end of capacitor C2 is connect with the tie point of the 3rd resistor R3 and the 4th resistance R4, and the second capacitor C2's is another
End ground connection, one end of the third capacitor C3 is connect with the tie point of the 4th resistance R4 and the 5th resistance R5, described
The other end of third capacitor C3 is grounded.
Preferably, the voltage follower circuit includes the 6th resistance R6, the 4th capacitor C4 and operational amplifier U, described
The normal phase input end of operational amplifier U is connect with the low-pass filter circuit, the inverting input terminal of the operational amplifier U and institute
The output end connection of operational amplifier U is stated, the output end of the operational amplifier U and the positive of the third diode D3 connect
It connects, the positive power source terminal of the operational amplifier U is connect with one end of the 4th capacitor C4, the other end of the 4th capacitor C4
Ground connection, the negative power end of the operational amplifier U are connect with one end of the 6th resistance R6, and the 6th resistance R6's is another
End is connect with the normal phase input end of the operational amplifier U.
On the other hand, the embodiment of the invention provides a kind of personal sampler, the personal sampler includes filter, delays
Rush tank, air pump, flow monitor, driving circuit, processor, battery and voltage detector, the filter, the buffering
Tank, the air pump, the flow monitor are sequentially communicated to form the access that air circulates in the personal sampler, the drive
Dynamic circuit and the air pump are sequentially connected, and the battery is electrically connected with the driving circuit, the voltage detector respectively, described
Processor is electrically connected with the driving circuit, the voltage detector, the flow monitor respectively, and the driving circuit includes
Motor MD, electrolytic capacitor E, first capacitor C1, first diode D1, triode Q and first resistor R1 and second resistance R2,
The first capacitor C1 is in parallel with the electrolytic capacitor E, the anode of the cathode of the first diode D1 and the electrolytic capacitor E
The anode of connection, the first diode D1 is connect with the collector of the triode Q, the motor MD and the one or two pole
Pipe D1 is in parallel, and the emitter of the triode Q is connect with the cathode of the electrolytic capacitor E, one end of the first resistor R1 and
The emitter of the triode Q connects, and the other end of the first resistor R1 is connect with the base stage of the triode Q, and described the
One end of two resistance R2 is connect with the base stage of the triode Q, and the driving circuit further includes for the voltage in the battery
When more than or equal to given threshold, Xiang Suoshu triode Q accesses the control signal for making the triode Q work in switch state
The first branch, and for the voltage in the battery be less than given threshold when, Xiang Suoshu triode Q access make the triode Q
The second branch of the control signal of magnifying state is worked in, the first branch and the second branch are electric with described second respectively
Hinder the other end connection of R2.
Optionally, the first branch includes anode the first arteries and veins of access of the second diode D2, the second diode D2
Bandwidth modulation signals PWM1 is rushed, the cathode of the second diode D2 is connect with the other end of the second resistance R2.
Optionally, the second branch includes low-pass filter circuit, voltage follower circuit and third diode D3, institute
The second pulse width modulating signal PWM2, the other end of the low-pass filter circuit and institute are accessed in the one end for stating low-pass filter circuit
The input terminal connection of voltage follower circuit is stated, the output end of the voltage follower circuit and the positive of the third diode D3 connect
It connects, the cathode of the third diode is connect with the other end of the second resistance R2.
Preferably, the low-pass filter circuit includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and second
The second pulse width modulating signal PWM2 is accessed in one end of capacitor C2 and third capacitor C3, the 3rd resistor R3, described
The other end of 3rd resistor R3 is connect with one end of the 4th resistance R4, the other end and the described 5th of the 4th resistance R4
One end of resistance R5 connects, and the other end of the 5th resistance R5 is connect with the input terminal of the voltage follower, and described second
One end of capacitor C2 is connect with the tie point of the 3rd resistor R3 and the 4th resistance R4, and the second capacitor C2's is another
End ground connection, one end of the third capacitor C3 is connect with the tie point of the 4th resistance R4 and the 5th resistance R5, described
The other end of third capacitor C3 is grounded.
Preferably, the voltage follower circuit includes the 6th resistance R6, the 4th capacitor C4 and operational amplifier U, described
The normal phase input end of operational amplifier U is connect with the low-pass filter circuit, the inverting input terminal of the operational amplifier U and institute
The output end connection of operational amplifier U is stated, the output end of the operational amplifier U and the positive of the third diode D3 connect
It connects, the positive power source terminal of the operational amplifier U is connect with one end of the 4th capacitor C4, the other end of the 4th capacitor C4
Ground connection, the negative power end of the operational amplifier U are connect with one end of the 6th resistance R6, and the 6th resistance R6's is another
End is connect with the normal phase input end of the operational amplifier U.
Technical solution provided in an embodiment of the present invention has the benefit that
Make triode operation in switch state when being greater than or equal to given threshold by the voltage in battery, it can be to avoid electricity
A large amount of electric energy in pond all consume in triode fever, improve the utilization rate of electrical of driving circuit, efficiently utilize battery capacity, prolong
The working time of long personal sampler；Make triode operation in magnifying state when the voltage of battery is less than given threshold simultaneously,
Can be lower and motor can not be started to avoid the voltage of battery, it makes full use of battery capacity to work, further extends personal sampling
The working time of device.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of the driving circuit of existing personal sampler provided by the invention；
Fig. 2 is a kind of structural schematic diagram of the driving circuit for personal sampler that the embodiment of the present invention one provides；
Fig. 3 is a kind of structural schematic diagram of personal sampler provided by Embodiment 2 of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
The embodiment of the invention provides a kind of driving circuits of personal sampler, and referring to Fig. 1, which includes motor
MD, electrolytic capacitor E, first capacitor C1, first diode D1, triode Q and first resistor R1 and second resistance R2.
Wherein, first capacitor C1 is in parallel with electrolytic capacitor E.The cathode of first diode D1 and the anode of electrolytic capacitor E connect
It connects, the anode of first diode D1 is connect with the collector of triode Q, and motor MD is in parallel with first diode D1, triode Q's
Emitter is connect with the cathode of electrolytic capacitor E.One end of first resistor R1 is connect with the emitter of triode Q, first resistor R1
The other end connect with the base stage of triode Q, one end of second resistance R2 is connect with the base stage of triode Q.
In the present embodiment, the driving circuit further include for the voltage in battery be greater than or equal to given threshold when, to
Triode Q accesses the first branch 100 for the control signal for making triode Q work in switch state, and for the voltage in battery
When less than given threshold, the second branch 200 for the control signal for making triode Q work in magnifying state is accessed to triode Q, the
One branch 100 and second branch 200 are connect with the other end of second resistance R2 respectively.
It should be noted that personal sampler is generally worn over the producer carries out mobile operation with it, therefore use battery
Power supply.Due to the duty cycle of personal sampler it is longer (need one complete production cycle of continuous work, i.e., eight hours not between
It is disconnected), the increase of battery weight and volume will be will lead to if it is power demand increase battery capacity is met, it can be individual to wearing
The producer of sampler brings huge physical load, it is therefore desirable to which driving circuit makes full use of battery capacity.
When the voltage of battery is greater than or equal to given threshold, triode Q is set to work in switch shape by the first branch 100
State can all consume in triode Q fever to avoid a large amount of electric energy of battery, improve the utilization rate of electrical of driving circuit, efficiently
Using battery capacity, extend the working time of personal sampler.When the voltage of battery is less than given threshold, pass through second branch
200 make triode Q work in magnifying state, can be lower and can not start motor MD to avoid the voltage of battery, make full use of electricity
Tankage work, further extends the working time of personal sampler.
Optionally, the first branch 100 may include the second diode D2.Anode the first pulse of access of second diode D2
Bandwidth modulation signals PWM1, the cathode of the second diode D2 are connect with the other end of second resistance R2.
Optionally, second branch 200 may include low-pass filter circuit 210, voltage follower circuit 220 and the three or two
Pole pipe D3.The second pulse width modulating signal PWM2 is accessed in one end of low-pass filter circuit 210, low-pass filter circuit 210 it is another
One end is connect with the input terminal of voltage follower circuit 220, the output end of voltage follower circuit 220 and the anode of third diode D3
Connection, the cathode of third diode D3 are connect with the other end of second resistance R2.
Preferably, low-pass filter circuit 210 may include 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, Yi Ji
Two capacitor C2 and third capacitor C3.The second pulse width modulating signal PWM2,3rd resistor R3 are accessed in one end of 3rd resistor R3
The other end connect with one end of the 4th resistance R4, the other end of the 4th resistance R4 is connect with one end of the 5th resistance R5, the 5th
The other end of resistance R5 is connect with the input terminal of voltage follower 220.One end of second capacitor C2 and 3rd resistor R3 and the 4th
The tie point of resistance R4 connects, the other end ground connection of the second capacitor C2.One end of third capacitor C3 and the 4th resistance R4 and the 5th
The tie point of resistance R5 connects, the other end ground connection of third capacitor C3.By using two-stage capacitance-resistance filter, high-frequency signal is put down
Sliding effect is more excellent, keeps motor operation more steady.
Preferably, voltage follower circuit 220 may include the 6th resistance R6, the 4th capacitor C4 and operational amplifier U.
The normal phase input end of operational amplifier U is connect with low-pass filter circuit 210, and inverting input terminal and the operation of operational amplifier U is put
The output end connection of big device U, the output end of operational amplifier U are connect with the anode of third diode D3, and operational amplifier U is just
Power end is connect with one end of the 4th capacitor C4, the other end of the 4th capacitor C4 ground connection, the negative power end of operational amplifier U and the
One end of six resistance R6 connects, and the other end of the 6th resistance R6 is connect with the normal phase input end of operational amplifier U.Capacitance-resistance filter structure
At circuit output impedance it is very high, triode can not be pushed directly on, using operational amplifier constitute with possessed by phase follower
The characteristic of high resistant input, low-resistance output, plays buffer function between low-pass filter circuit and triode.
The embodiment of the present invention makes triode operation in switch shape when being greater than or equal to given threshold by the voltage in battery
State can all consume in triode fever to avoid a large amount of electric energy of battery, improve the utilization rate of electrical of driving circuit, efficiently benefit
With battery capacity, extend the working time of personal sampler；Make triode work when the voltage of battery is less than given threshold simultaneously
Make in magnifying state, can be lower and motor can not be started to avoid the voltage of battery, make full use of battery capacity to work, further
Extend the working time of personal sampler.
Embodiment two
The embodiment of the invention provides a kind of personal samplers, and referring to fig. 2, which includes filter 10, delays
Rush tank 20, air pump 30, flow monitor 40, driving circuit 50, processor 60, battery 70 and voltage detector 80.
In the present embodiment, filter 10, surge tank 20, air pump 30, flow monitor 40, which are sequentially communicated, to form air and exists
The access to circulate in personal sampler, driving circuit 50 and air pump 30 are sequentially connected, battery 70 respectively with driving circuit 50, voltage
Detector 80 is electrically connected, and processor 60 is electrically connected with driving circuit 50, voltage detector 80, flow monitor 40 respectively.
Specifically, driving circuit 50 can be identical as the driving circuit that embodiment one provides, and this will not be detailed here.
In practical applications, under the action of air pump 30, dust laden air enters filter, is equipped in filter and to have weighed
Dustless filter paper, the dust in air stay on filter paper, and dust-free air passes sequentially through surge tank 20, air pump 30, flow monitoring
Personal sampler is discharged in device 40.
It weighs the quality of dust-laden filter paper again later, the mass concentration of dust can be calculated according to the following formula:
Wherein, ρ is the mass concentration of dust, unit mg/m3；M1 is the quality of dustless filter paper, unit mg；M2 is
The quality of dust-laden filter paper, unit mg；Q is the air mass flow that flow monitor 40 acquires, unit L/min；T adopts for individual
The sampling time of sample device, unit min.
In addition, testing result of the processor 60 according to voltage detector 80 and flow monitor 40, adjusts driving circuit 50,
Realize the start and stop of air pump 30 and the adjusting of power.
Optionally, which can also include the keyboard 80 and use for setting the adjusting parameter of driving circuit 50
In the liquid crystal display 90 of display adjusting parameter and testing result, keyboard 80 and liquid crystal display 90 are electrically connected with processor 60 respectively.
The embodiment of the present invention makes triode operation in switch shape when being greater than or equal to given threshold by the voltage in battery
State can all consume in triode fever to avoid a large amount of electric energy of battery, improve the utilization rate of electrical of driving circuit, efficiently benefit
With battery capacity, extend the working time of personal sampler；Make triode work when the voltage of battery is less than given threshold simultaneously
Make in magnifying state, can be lower and motor can not be started to avoid the voltage of battery, make full use of battery capacity to work, further
Extend the working time of personal sampler.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of driving circuit of personal sampler, the driving circuit includes motor MD, electrolytic capacitor E, first capacitor C1,
One diode D1, triode Q and first resistor R1 and second resistance R2, the first capacitor C1 and the electrolytic capacitor E are simultaneously
Connection, the cathode of the first diode D1 are connect with the anode of the electrolytic capacitor E, the anode of the first diode D1 and institute
State triode Q collector connection, the motor MD is in parallel with the first diode D1, the emitter of the triode Q and
The cathode of the electrolytic capacitor E connects, and one end of the first resistor R1 is connect with the emitter of the triode Q, and described the
The other end of one resistance R1 is connect with the base stage of the triode Q, the base of one end of the second resistance R2 and the triode Q
Pole connection, which is characterized in that the driving circuit further includes when being greater than or equal to given threshold for the voltage in battery, to institute
The first branch for the control signal that triode Q access makes the triode Q work in switch state is stated, and for the electricity in battery
When pressure is less than given threshold, Xiang Suoshu triode Q accesses control signal second for making the triode Q work in magnifying state
Road, the first branch and the second branch are connect with the other end of the second resistance R2 respectively；
The first branch includes anode access the first pulse width modulation letter of the second diode D2, the second diode D2
Number PWM1, the cathode of the second diode D2 are connect with the other end of the second resistance R2；
The second branch includes low-pass filter circuit, voltage follower circuit and third diode D3, the low-pass filtering electricity
The second pulse width modulating signal PWM2, the other end of the low-pass filter circuit and voltage follow electricity are accessed in the one end on road
The input terminal on road connects, and the output end of the voltage follower circuit is connect with the anode of the third diode D3, the third
The cathode of diode D3 is connect with the other end of the second resistance R2.
2. driving circuit according to claim 1, which is characterized in that the low-pass filter circuit include 3rd resistor R3,
4th resistance R4, the 5th resistance R5 and the second capacitor C2 and third capacitor C3, the 3rd resistor R3 one end access described in
Second pulse width modulating signal PWM2, the other end of the 3rd resistor R3 are connect with one end of the 4th resistance R4, institute
The other end for stating the 4th resistance R4 is connect with one end of the 5th resistance R5, the other end and the electricity of the 5th resistance R5
Press the input terminal connection of follower, one end of the second capacitor C2 and the company of the 3rd resistor R3 and the 4th resistance R4
Contact connection, the other end ground connection of the second capacitor C2, one end of the third capacitor C3 and the 4th resistance R4 and institute
State the tie point connection of the 5th resistance R5, the other end ground connection of the third capacitor C3.
3. driving circuit according to claim 1 or 2, which is characterized in that the voltage follower circuit includes the 6th resistance
R6, the 4th capacitor C4 and operational amplifier U, the normal phase input end and the low-pass filter circuit of the operational amplifier U connect
It connects, the inverting input terminal of the operational amplifier U is connect with the output end of the operational amplifier U, the operational amplifier U's
Output end is connect with the anode of the third diode D3, the positive power source terminal of the operational amplifier U and the 4th capacitor C4
One end connection, the other end ground connection of the 4th capacitor C4, the negative power end of the operational amplifier U and the 6th resistance
One end of R6 connects, and the other end of the 6th resistance R6 is connect with the normal phase input end of the operational amplifier U.
4. a kind of personal sampler, the personal sampler includes filter, surge tank, air pump, flow monitor, driving electricity
Road, processor, battery and voltage detector, the filter, the surge tank, the air pump, the flow monitor according to
Secondary connection forms the access that air circulates in the personal sampler, and the driving circuit and the air pump are sequentially connected, institute
Battery is stated to be electrically connected with the driving circuit, the voltage detector respectively, the processor respectively with the driving circuit, institute
Voltage detector, flow monitor electrical connection are stated, the driving circuit includes motor MD, electrolytic capacitor E, first capacitor
C1, first diode D1, triode Q and first resistor R1 and second resistance R2, the first capacitor C1 and electrolysis electricity
Hold E parallel connection, the cathode of the first diode D1 is connect with the anode of the electrolytic capacitor E, and the first diode D1 is just
Pole is connect with the collector of the triode Q, and the motor MD is in parallel with the first diode D1, the hair of the triode Q
Emitter-base bandgap grading is connect with the cathode of the electrolytic capacitor E, and one end of the first resistor R1 is connect with the emitter of the triode Q,
The other end of the first resistor R1 is connect with the base stage of the triode Q, one end of the second resistance R2 and three pole
The base stage of pipe Q connects, which is characterized in that the driving circuit further includes being greater than or equal to setting for the voltage in the battery
When threshold value, Xiang Suoshu triode Q access makes the triode Q work in the first branch for controlling signal of switch state, and uses
When the voltage in the battery is less than given threshold, Xiang Suoshu triode Q access makes the triode Q work in magnifying state
Control signal second branch, the first branch and the second branch connect with the other end of the second resistance R2 respectively
It connects；
The first branch includes anode access the first pulse width modulation letter of the second diode D2, the second diode D2
Number PWM1, the cathode of the second diode D2 are connect with the other end of the second resistance R2；
The second branch includes low-pass filter circuit, voltage follower circuit and third diode D3, the low-pass filtering electricity
The second pulse width modulating signal PWM2, the other end of the low-pass filter circuit and voltage follow electricity are accessed in the one end on road
The input terminal on road connects, and the output end of the voltage follower circuit is connect with the anode of the third diode D3, the third
The cathode of diode is connect with the other end of the second resistance R2.
5. personal sampler according to claim 4, which is characterized in that the low-pass filter circuit includes 3rd resistor
R3, the 4th resistance R4, the 5th resistance R5 and the second capacitor C2 and third capacitor C3, one end access of the 3rd resistor R3
One end of the second pulse width modulating signal PWM2, the other end of the 3rd resistor R3 and the 4th resistance R4 connect
Connect, the other end of the 4th resistance R4 is connect with one end of the 5th resistance R5, the other end of the 5th resistance R5 with
The input terminal of the voltage follower connects, one end of the second capacitor C2 and the 3rd resistor R3 and the 4th resistance
The tie point of R4 connects, the other end ground connection of the second capacitor C2, one end of the third capacitor C3 and the 4th resistance
R4 is connected with the tie point of the 5th resistance R5, the other end ground connection of the third capacitor C3.
6. personal sampler according to claim 4 or 5, which is characterized in that the voltage follower circuit includes the 6th electricity
Hinder the normal phase input end and the low-pass filter circuit of R6, the 4th capacitor C4 and operational amplifier U, the operational amplifier U
Connection, the inverting input terminal of the operational amplifier U are connect with the output end of the operational amplifier U, the operational amplifier U
The anode of output end and the third diode D3 connect, the positive power source terminal of the operational amplifier U and the 4th capacitor
One end of C4 connects, the other end ground connection of the 4th capacitor C4, the negative power end of the operational amplifier U and the 6th electricity
One end connection of R6 is hindered, the other end of the 6th resistance R6 is connect with the normal phase input end of the operational amplifier U.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610361257.9A CN105938082B (en) | 2016-05-26 | 2016-05-26 | A kind of driving circuit and personal sampler of personal sampler |
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| CN201610361257.9A CN105938082B (en) | 2016-05-26 | 2016-05-26 | A kind of driving circuit and personal sampler of personal sampler |
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| CN105938082A CN105938082A (en) | 2016-09-14 |
| CN105938082B true CN105938082B (en) | 2019-05-17 |
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| CN201610361257.9A Expired - Fee Related CN105938082B (en) | 2016-05-26 | 2016-05-26 | A kind of driving circuit and personal sampler of personal sampler |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715507A1 (en) * | 1987-05-09 | 1988-11-17 | Berufsgenossenschaft Nahrungsm | Measurement of dust conc. in gas or solid particle conc. in liquid - opto-electronically measuring intensity of light pulses passed through medium |
| CN102854111A (en) * | 2012-08-31 | 2013-01-02 | 常熟市德虞矿山机电有限公司 | Dust concentration detector |
| CN205786217U (en) * | 2016-05-26 | 2016-12-07 | 江汉大学 | The drive circuit of a kind of personal sampler and personal sampler |
-
2016
- 2016-05-26 CN CN201610361257.9A patent/CN105938082B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715507A1 (en) * | 1987-05-09 | 1988-11-17 | Berufsgenossenschaft Nahrungsm | Measurement of dust conc. in gas or solid particle conc. in liquid - opto-electronically measuring intensity of light pulses passed through medium |
| CN102854111A (en) * | 2012-08-31 | 2013-01-02 | 常熟市德虞矿山机电有限公司 | Dust concentration detector |
| CN205786217U (en) * | 2016-05-26 | 2016-12-07 | 江汉大学 | The drive circuit of a kind of personal sampler and personal sampler |
Non-Patent Citations (1)
| Title |
|---|
| 粉尘浓度的测量;杨世忠等;《矿业安全与环保》;20070831;第26-27页 * |
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| CN105938082A (en) | 2016-09-14 |
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