CN208401535U - A kind of temperature is precisely controlled anti-dry protection circuit - Google Patents
A kind of temperature is precisely controlled anti-dry protection circuit Download PDFInfo
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- CN208401535U CN208401535U CN201821177821.2U CN201821177821U CN208401535U CN 208401535 U CN208401535 U CN 208401535U CN 201821177821 U CN201821177821 U CN 201821177821U CN 208401535 U CN208401535 U CN 208401535U
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Abstract
The utility model discloses a kind of temperature to be precisely controlled anti-dry protection circuit, is set to suction unit, including main control unit, buck translation circuit, current sampling circuit, voltage sampling circuit and heating wire, buck translation circuit is circumscribed with power supply；It further include switch switching circuit, constant-current source output control circuit and heating wire tension measuring circuit；The switch switching circuit is connected between the output end and heating wire of buck translation circuit, while connecting and being controlled by main control unit, controls output of the output end of buck translation circuit to heating wire；Constant current source control circuit is when switch switching circuit is turned off to heating wire output constant current power supply；Heating wire tension measuring circuit samples the real-time voltage of heating wire and feeds back to main control unit.The phenomenon that the utility model improves the temperature control precision of suction unit, improves the suction mouthfeel of suction unit, is easy dry combustion method after avoiding tobacco tar from burning down, generates burnt taste.
Description
Technical field
The utility model relates to suction unit technical fields more particularly to a kind of temperature to be precisely controlled anti-dry protection electricity
Road.
Background technique
Electronic cigarette is only counted as a kind of substitute of environmental protection more healthier than conventional cigarette originally.But nowadays, it rapidly at
Long commercial value and trend culture, and attracting more concerns, it is counted according to associated mechanisms, global electronic cigarette market scale
It is expected that 12,000,000,000 pounds of the year two thousand twenty will be increased to from 700,000,000 in 2010 pounds, Compound Annual Growth Rate reaches 20%.Electronic cigarette makes
User's number will also increase to fifty-five million people in 2021 from 7,000,000 people in 2011.
For electronic cigarette as a kind of product for substituting conventional cigarette, its advantages have: health, environmental protection, multiple tastes (water
Fruity, tobacco flavor).Because the atomization temperature of the electronics tobacco tar (liquid) of different taste is also different, in order to make various tastes
Electronics tobacco tar (liquid) reaches best mouthfeel in heating atomization, just necessarily requires electronic cigarette atomization device being capable of precision controlling heating
Temperature.
In existing most of great-power electronic cigarettes can be equipped with temperature adjusting control function, but the function generally by
Current sampler and voltage sampling circuit acquisition electric current are set in the power supply circuit of heating wire and voltage value is calculated, heating wire
Power supply circuit in current sampling devices influenced by temperature change, and the faint signal of electric current needs to be carried out with operational amplifier
Amplification, since output electric current is bigger, the current ripples in circuit are bigger, and amplifier is easy to be disturbed, and cause amplified
Its error rate of signal is bigger, final heating wire resistance value when heated read it is not accurate, usual error in 5%-10% or so, therefore
Its temperature control precision is lower.
That there are temperature control precisions is poor for i.e. existing common electronic cigarette suction unit on the market, and mouthfeel is poor, and tobacco tar is burnt down
It is easy dry combustion method afterwards, generates burnt taste, user experience is poor.
Therefore, there are also to be developed for the prior art.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is that it is anti-to propose that a kind of temperature is precisely controlled
Circuit is protected in dry combustion method, it is intended to which the temperature control precision for improving suction unit improves the suction mouthfeel of suction unit, tobacco tar is avoided to burn
The phenomenon that being easy dry combustion method after complete, generating burnt taste.
To achieve the above object, the utility model takes following technical scheme:
A kind of temperature is precisely controlled anti-dry protection circuit, is set to suction unit, including main control unit, buck transformation
Circuit, current sampling circuit, voltage sampling circuit and heating wire, buck translation circuit are circumscribed with power supply；Main control unit
It connects the buck translation circuit and controls the output voltage size of buck translation circuit output end；Current sampling circuit with
The output end and main control unit of buck translation circuit connect, and the output electric current of buck translation circuit is sampled and fed back
To main control unit；Voltage sampling circuit is connect with the output end of buck translation circuit and main control unit, converts electricity to buck
The output voltage on road is sampled and feeds back to main control unit；Wherein,
It further include switch switching circuit, constant-current source output control circuit and heating wire tension measuring circuit；
The switch switching circuit is connected between the output end and heating wire of buck translation circuit, at the same connect and by
Control in main control unit, the on-off of main control unit control switch switching circuit on or off buck translation circuit output
Hold the output to heating wire；The constant current source control circuit is connect with heating wire, while connecting and being controlled by main control unit, when opening
To heating wire output constant current power supply when closing switching circuit shutdown；The heating wire tension measuring circuit is connect with heating wire, simultaneously
Main control unit is connected, the real-time voltage of heating wire is sampled and feeds back to main control unit.
Wherein, the main control unit is MCU module, and MCU module setting is there are three enabled pin EN1, EN2, EN3, two
PWM pin PWM1, PWM2, three feedback signals receive pin AD1, AD2, AD3；EN1, PWM1, PWM2 pin connection rises
Step-down conversion circuit, the AD1 pin connect current sampling circuit, and the AD2 pin connects voltage sampling circuit, the EN2
Pin connection switch switching circuit, the EN3 pin connect constant-current source output control circuit, and the AD3 pin connects heating wire
Tension measuring circuit, heating wire one end ground connection, the other end connect the switch switching circuit, constant-current source output control circuit and hair
Heater voltage measuring circuit.
Wherein, the switch switching circuit includes the first transistor Q1 of an at least on-off action, the first transistor
The first pin controlled connection of Q1 is separately connected liter in the EN2 pin of main control unit, second, third pin of the first transistor Q1
The output end and heating wire of step-down conversion circuit.
Wherein, the switch switching circuit further includes the first control electricity of transistor Q2, Q3 and resistance R4, R5, R6 composition
Road is connected between EN2 pin and Q1, and first control circuit controls the turn-on and turn-off of Q1.
Wherein, the constant-current source output control circuit includes the second transistor Q4 and constant-current source of an at least on-off action,
The first pin controlled connection of the second transistor Q4 in the EN3 pin of main control unit, second transistor Q4 second, third
Pin is separately connected power supply and constant-current source, and constant-current source connects the heating wire.
Wherein, the constant-current source output control circuit further includes the second control circuit of transistor Q5 and resistance R7 composition,
It is connected between EN3 pin and Q4, second control circuit controls the turn-on and turn-off of Q4 to control the output of constant-current source.
Wherein, the heating wire tension measuring circuit includes an operational amplifier U3 and three resistance R8, R9, R10；Institute
The one end R8 connection heating wire is stated, the other end connects the electrode input end of U3, and the negative input of U3 is separately connected the one of R9 and R10
End, the other end ground connection of R10 connect the AD3 pin of main control unit together after the output end connection of the other end and U3 of R9.
Wherein, the chip of the main control unit MCU module uses the chip of STM32 series.
The temperature of the utility model is precisely controlled anti-dry protection circuit, by the way that main control unit is arranged in suction unit,
Buck translation circuit, current sampling circuit, voltage sampling circuit, heating wire, switch switching circuit, constant-current source output control electricity
Road and heating wire tension measuring circuit, the on or off switching of switch switching circuit is to control the output of buck translation circuit
Hold to the power output of heating wire, constant current source control circuit when switch switching circuit is turned off to heating wire output constant current power supply,
Heating wire tension measuring circuit is sampled to the real-time voltage of heating wire and is fed back to main control unit, and main control unit is according to constant current
The electric current of power supply output, the voltage of heating wire tension measuring circuit acquisition calculate the real time resistance of heating wire during the work time,
Then real time temperature is calculated according to the TCR coefficient of material, and judges whether it is dry combustion method, if it is dry-fire condition, stop rising immediately
Step-down conversion circuit exports the heating of heating wire.Since the acquisition of the utility model heating wire electric current and voltage is in buck
It carries out in the state of translation circuit cutting, not by the interference of ripple current and amplifier in buck translation circuit, measures
Numerical precision is high, to improve the control precision of temperature, can accurately prevent dry combustion method, substantially improves mouthfeel, is promoted and is used
The usage experience at family.
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 composition schematic diagram that the utility model temperature is precisely controlled that anti-dry protects the first embodiment of circuit；
Drawing reference numeral explanation:
100- anti-dry protection circuit, 10- main control unit, 20- buck translation circuit, 21- output end, 30- electric current are adopted
Sample circuit, 40- voltage sampling circuit, 50- heating wire, 60- power supply, 70- switch switching circuit, the output control of 80- constant-current source
Circuit processed, 90- heating wire tension measuring circuit.
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 the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment
It is only used for explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, such as
When the fruit particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. should do broad sense reason
Solution, for example, " connection " may be a fixed connection, may be a detachable connection, or integral；It can be mechanical connection, it can also
To be electrical connection；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary
Or the interaction relationship of two elements, unless otherwise restricted clearly.It for the ordinary skill in the art, can be with
The concrete meaning of above-mentioned term in the present invention is understood as the case may be.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and cannot manage
Solution is its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.
Referring to FIG. 1, the utility model proposes a kind of temperature to be precisely controlled anti-dry protection circuit 100, it is set to suction
Device such as electronic cigarette etc., including main control unit 10, buck translation circuit 20, current sampling circuit 30, voltage sampling circuit 40
And heating wire 50, buck translation circuit 20 are circumscribed with power supply 60；The buck translation circuit 20 of the present embodiment is using straight
Stream-direct current/buck translation circuit (DC-DC/Buck-Boost), power supply 60 are powered using battery (Battery).
Main control unit 10 connects the buck translation circuit 20 and controls the output of buck translation circuit output end 21
Voltage swing；
Current sampling circuit 30 is connect with the output end 21 of buck translation circuit and main control unit 10, is converted to buck
The output electric current of circuit 20 is sampled and feeds back to main control unit 10；
Voltage sampling circuit 40 is connect with the output end 21 of buck translation circuit and main control unit 10, is converted to buck
The output voltage of circuit 20 is sampled and feeds back to main control unit 10；Current sampling circuit 30 and voltage sampling circuit 40
Value of feedback is used to control the size of 20 output voltage of buck translation circuit, and the utility model buck translation circuit 20 exports electricity
The size of pressure is controlled in 0~9V.
Anti-dry protection circuit 100 further includes switch switching circuit 70, constant-current source output control circuit 80 and heating wire electricity
Press measuring circuit 90；
The switch switching circuit 70 is connected between the output end 21 of buck translation circuit and heating wire 50, is connected simultaneously
Main control unit 10 is connect and is controlled by, the on-off of 10 control switch switching circuit 70 of main control unit is on or off lifting buckling
Change output of the output end 21 of circuit to heating wire 50；
The constant current source control circuit 80 is connect with heating wire 50, while connecting and being controlled by main control unit 10, works as switch
To 50 output constant current power supply of heating wire when switching circuit 70 turns off；
The heating wire tension measuring circuit 90 is connect with heating wire 50, while connecting main control unit 10, to heating wire 50
Real-time voltage sampled and feed back to main control unit 10.
The on or off switching buck translation circuit 20 or constant current source control circuit 80 of switch switching circuit 70 are right
The power supply of heating wire, when switch switching circuit 70 is connected, the output end 21 of buck translation circuit 20 powers to heating wire 50,
Heating wire 50 is heated, at this point, constant current source control circuit 80 does not export electric current to heating wire；When switch switching circuit 70
When shutdown, the output end 21 and heating wire 50 of buck translation circuit 20 are disconnected, at this point, constant current source control circuit 80 opens function, it is right
Heating wire 50 exports electric current, and main control unit 10 starts to carry out real-time sampling to the electric current and voltage of heating wire 50, calculates fever
The real-time resistance value of silk 50, and real time temperature is then calculated according to the TCR coefficient of fever wire material, and real according to heating wire 50
When temperature value variation and main control unit 10 in the temperature curve judgement heating wire 50 at this time that prestores whether in dry-fire condition,
(when being in dry combustion method when not having tobacco tar, the temperature curve slope when slope of heating wire temperature curve is with the presence of tobacco tar is obvious
Difference) if stopping buck translation circuit 20 immediately to heating wire 50 for electric heating in dry-fire condition.
Buck translation circuit 20 when heated, output be high current and high frequency switching signal, electric current in circuit
Ripple is big, while if sampled using the electric current that buck translation circuit 20 exports, high current signal is put through amplifier
Error is bigger after big, calculates 50 resistance value of heating wire and temperature error is big, can not achieve the accurate control of temperature, cannot be effective
Ground avoids dry combustion method.And in the present embodiment, switch switching circuit 70 switches over heating wire 50 between the two states, that is, heats
When state, heating power supply is carried out to heating wire 50 using buck translation circuit 20, in resistance value measuring state, uses constant-current source
Power supply of the control circuit 80 to heating wire due to not needing high current in measurement, therefore need to only control constant current source control circuit
The constant Weak current of 80 outputs, and the voltage drop at the both ends under this Weak current of heating wire 50 is measured, output electric current is small,
Its circuit ripple is small, and without the interference of the high-frequency switching signal in buck translation circuit 20, can go out generate heat with accurate calculation
50 resistance change during heating of silk, fever wire material be it is known, can be with by the TCR coefficient for the wire material that generates heat
Calculate the real-time temperature of heating wire, the error of the present embodiment about 1%, the real-time current of heating wire 50 and the measurement essence of voltage value
Degree greatly improves, can accurately heating wire 50 prevents dry combustion method in suction unit, improve the mouthfeel of electronic cigarette, promote user's
Usage experience.
Specifically, as shown in Figure 1, the main control unit 10 of the utility model is MCU module, there are three make for MCU module setting
Can pin EN1, EN2, EN3, two PWM pins PWM1, PWM2, three feedback signals receive pin AD1, AD2, AD3；
EN1, PWM1, PWM2 pin connects buck translation circuit 20, and the AD1 pin connects current sampling circuit
30, the AD2 pin connects voltage sampling circuit 40, the EN2 pin connection switch switching circuit 70, and the EN3 pin connects
Constant-current source output control circuit 80 is connect, the AD3 pin connects heating wire tension measuring circuit 90, and 50 one end of heating wire is grounded,
The other end connects the switch switching circuit 70, constant-current source output control circuit 80 and heating wire tension measuring circuit 90.This reality
The current sampling circuit 30 for applying example includes the AD1 pin of the output end of resistance R1 and amplifier U2, U2 connection main control unit 10,
Voltage sampling circuit 40 includes resistance R3 and resistance R2, and the output end 21 of buck translation circuit 20 passes through point of resistance R3 and R2
The AD2 pin of main control unit 10 is connected after pressure.
The switch switching circuit 70 of the utility model includes the first transistor Q1 of an at least on-off action, and described first is brilliant
The first pin controlled connection of body pipe Q1 is distinguished in the EN2 pin of main control unit 10, second, third pin of the first transistor Q1
Connect the output end 21 and heating wire 50 of buck translation circuit.Further, the switch switching circuit 70 further includes crystal
The first control circuit of pipe Q2, Q3 and resistance R4, R5, R6 composition, are connected between EN2 pin and Q1, first control circuit
Control the turn-on and turn-off of Q1.
With continued reference to FIG. 1, the constant-current source output control circuit 80 of the utility model includes the of an at least on-off action
Two-transistor Q4 and constant-current source 81 (Constant current Source), the first pin of the second transistor Q4 is controlled
It is connected to the EN3 pin of main control unit 10, second, third pin of second transistor Q4 is separately connected power supply and constant-current source 81,
Constant-current source 81 connects the heating wire 50.Further, the constant-current source output control circuit 80 further includes transistor Q5, and electricity
Hinder R7 composition second control circuit, be connected between EN3 pin and Q4, second control circuit control Q4 turn-on and turn-off with
Control the output of constant-current source 81.
The heating wire tension measuring circuit 90 of the utility model include an operational amplifier U3 and three resistance R8, R9,
R10；Described one end R8 connects heating wire 50, and the other end connects the electrode input end of U3, and the negative input of U3 is separately connected R9
It is grounded with the other end of one end of R10, R10, connects main control unit 10 together after the output end connection of the other end and U3 of R9
AD3 pin.Heating wire tension measuring circuit 90 real-time voltage of heating wire 50 is accurately measured and by AD3 pin it is anti-
It is fed to main control unit 10.
Preferably, the chip of the main control unit MCU module of the utility model uses the chip of STM32 series.As use with
Chip STM32F030C8T6, STM32F072RBT6, STM32F401RBT6 or STM32F412RET6 of lower model.STM32
Series chip by acquisition electric current and voltage value plug-in is accurately controlled the temperature of heating wire 50.
The utility model temperature is precisely controlled the concrete operating principle of anti-dry protection circuit 100 are as follows:
When heating to heating wire 50, MCU-EN2 exports high level, Q3 conducting, Q2 shutdown, Q1 conducting, buck transformation
Circuit 20 exports electric energy to heater strip 50, while MCU-EN3 output low level turns off Q5 and Q4, and constant-current source 81 does not work, permanent
Stream source control circuit 80 does not export.
When obtaining the real-time resistance value of heating wire, MUC-EN2 exports low level, Q3 shutdown, and Q2 conducting turns off Q1, goes up and down
Pressure translation circuit 20 does not export, while Q5 and Q4 is connected in MCU-EN3 output high level, and constant-current source 81 works, constant-current source control
Circuit 80 exports a smaller and constant electric current and is given to heating wire 50.Because reading the heating wire resistance value time only needs 100 μ S
~1mS, so main control unit every 10~50mS period reads a resistance value.
The example of the utility model temperature is precisely controlled anti-dry protection circuit 100 during heating, and Q1 often opens 10mS
Turn off 1mS, Q1 during turn off 1mS, constant current source control circuit 80 export height accurately constant current (trueness error 1ma) to
To heating wire 50, pressure drop can be generated at 50 both ends of heating wire, heating wire tension measuring circuit 90 is by detecting 50 liang of heating wire
The pressure drop at end.Electric current (I) precision of constant-current source output is higher, detects heating wire 50 in conjunction with heating wire tension measuring circuit 90
The pressure drop (V) at both ends is so obtained an accurate heating wire resistance value (R=V/I).Main control unit 10 goes out according to accurate calculation
The resistance change during heating of heating wire 50 and calculate the real-time temperature of heating wire 50, because 50 material of heating wire is
It is known, by the TCR coefficient of 50 material of heating wire, the real-time temperature of heating wire 50 can be calculated.Existed according to heating wire 50
The temperature curve prestored in the variation of real time temperature, with main control unit 10 in heating process compares, and can accurately judge to send out
The state of heated filament 50 stops the heating to heating wire 50 when being in dry-fire condition immediately.
The utility model proposes temperature be precisely controlled anti-dry protection circuit 100, pass through in suction unit be arranged master
Control unit 10, buck translation circuit 20, current sampling circuit 30, voltage sampling circuit 40, heating wire 50, switch switching circuit
70, constant-current source output control circuit 80 and heating wire tension measuring circuit 90, the on or off switching of switch switching circuit 70
To control buck translation circuit output end 21 to the power output of heating wire 50, constant current source control circuit 80 is in switching
To 50 output constant current power supply of heating wire when circuit 70 turns off, heating wire tension measuring circuit 90 to the real-time voltage of heating wire 50 into
Row, which samples, simultaneously feeds back to main control unit 10, electric current that main control unit 10 is exported according to constant-current supply, heating wire tension measuring circuit
The voltage of 90 acquisitions calculates the real time resistance of heating wire 50 during the work time, is then calculated according to the TCR coefficient of material real-time
Temperature, and judge whether it is dry combustion method, if it is dry-fire condition, stop heating of the buck translation circuit 20 to heating wire 50 immediately
Output.Due to the acquisition of 50 electric current of the utility model heating wire and voltage be buck translation circuit 20 cut off in the state of into
Row, not by the interference of ripple current, high-frequency switching signal and amplifier in buck translation circuit 20, the numerical precision of measurement
Height can be accurately controlled the heating temperature of heating wire 50, can accurately prevent the dry combustion method of heating wire 50, substantially improve
The mouthfeel of electronic cigarette smog promotes the usage experience of user.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (8)
1. a kind of temperature is precisely controlled anti-dry protection circuit, it is set to suction unit, including main control unit, buck transformation electricity
Road, current sampling circuit, voltage sampling circuit and heating wire, buck translation circuit are circumscribed with power supply；
Main control unit connects the buck translation circuit and controls the output voltage size of buck translation circuit output end；
Current sampling circuit is connect with the output end of buck translation circuit and main control unit, the output to buck translation circuit
Electric current is sampled and feeds back to main control unit；
Voltage sampling circuit is connect with the output end of buck translation circuit and main control unit, the output to buck translation circuit
Voltage is sampled and feeds back to main control unit；
It is characterized in that,
It further include switch switching circuit, constant-current source output control circuit and heating wire tension measuring circuit；
The switch switching circuit is connected between the output end and heating wire of buck translation circuit, while being connected and being controlled by
Main control unit, the on-off of main control unit control switch switching circuit on or off buck translation circuit output end pair
The output of heating wire；
The constant current source control circuit is connect with heating wire, while connecting and being controlled by main control unit, when switch switching circuit is closed
To heating wire output constant current power supply when disconnected；
The heating wire tension measuring circuit is connect with heating wire, while connecting main control unit, to the real-time voltage of heating wire into
Row samples and feeds back to main control unit.
2. temperature according to claim 1 is precisely controlled anti-dry protection circuit, which is characterized in that the main control unit is
MCU module, there are three enabled pin EN1, EN2, EN3, two PWM pins PWM1, PWM2, three feedback letters for MCU module setting
Number receive pin AD1, AD2, AD3；
EN1, PWM1, PWM2 pin connects buck translation circuit, and the AD1 pin connects current sampling circuit, described
AD2 pin connects voltage sampling circuit, the EN2 pin connection switch switching circuit, the EN3 pin connection constant-current source output
Control circuit, the AD3 pin connect heating wire tension measuring circuit, heating wire one end ground connection, and the other end connects the switch
Switching circuit, constant-current source output control circuit and heating wire tension measuring circuit.
3. temperature according to claim 2 is precisely controlled anti-dry protection circuit, which is characterized in that
The switch switching circuit includes the first transistor Q1 of an at least on-off action, and the first of the first transistor Q1 is drawn
For foot controlled connection in the EN2 pin of main control unit, second, third pin of the first transistor Q1 is separately connected buck transformation electricity
The output end and heating wire on road.
4. temperature according to claim 3 is precisely controlled anti-dry protection circuit, which is characterized in that
The switch switching circuit further includes the first control circuit of transistor Q2, Q3 and resistance R4, R5, R6 composition, is connected to
Between EN2 pin and Q1, first control circuit controls the turn-on and turn-off of Q1.
5. temperature according to claim 1 is precisely controlled anti-dry protection circuit, which is characterized in that
The constant-current source output control circuit includes the second transistor Q4 and constant-current source of an at least on-off action, and described second is brilliant
The first pin controlled connection of body pipe Q4 connects respectively in the EN3 pin of main control unit, second, third pin of second transistor Q4
Power supply and constant-current source are connect, constant-current source connects the heating wire.
6. temperature according to claim 5 is precisely controlled anti-dry protection circuit, which is characterized in that the constant-current source output
Control circuit further includes the second control circuit of transistor Q5 and resistance R7 composition, is connected between EN3 pin and Q4, second
Control circuit controls the turn-on and turn-off of Q4 to control the output of constant-current source.
7. temperature according to claim 1 is precisely controlled anti-dry protection circuit, which is characterized in that the fever filament voltage
Measuring circuit includes an operational amplifier U3 and three resistance R8, R9, R10；
Described one end R8 connects heating wire, and the other end connects the electrode input end of U3, the negative input of U3 be separately connected R9 and
One end of R10, the other end ground connection of R10, the AD3 for connecting main control unit after the output end connection of the other end and U3 of R9 together draw
Foot.
8. temperature according to claim 1 is precisely controlled anti-dry protection circuit, which is characterized in that the main control unit
The chip of MCU module uses the chip of STM32 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821177821.2U CN208401535U (en) | 2018-07-23 | 2018-07-23 | A kind of temperature is precisely controlled anti-dry protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821177821.2U CN208401535U (en) | 2018-07-23 | 2018-07-23 | A kind of temperature is precisely controlled anti-dry protection circuit |
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| CN208401535U true CN208401535U (en) | 2019-01-18 |
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| CN201821177821.2U Active CN208401535U (en) | 2018-07-23 | 2018-07-23 | A kind of temperature is precisely controlled anti-dry protection circuit |
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| CN109588785A (en) * | 2019-01-21 | 2019-04-09 | 深圳市太美亚电子科技有限公司 | A kind of anti-dry control circuit of electronic cigarette |
| CN110250580A (en) * | 2019-06-26 | 2019-09-20 | 西安拓尔微电子有限责任公司 | A kind of High Accuracy Constant Temperature electronic cigarette based on dual power supply |
| CN110279149A (en) * | 2019-06-11 | 2019-09-27 | 深圳市长盈精密技术股份有限公司 | A kind of electronic smoke atomizer temperature-compensation circuit and control method |
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| WO2021057297A1 (en) * | 2019-09-25 | 2021-04-01 | 深圳市康泓威科技有限公司 | Electronic cigarette having automatic closed-loop control output power source chip |
| CN113126592A (en) * | 2021-03-12 | 2021-07-16 | 浙江喜尔康智能家居股份有限公司 | Fault detection system for intelligent closestool heating loop |
| CN113551370A (en) * | 2021-07-12 | 2021-10-26 | 珠海格力电器股份有限公司 | Dry burning detection method of air conditioner and air conditioner |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109588785A (en) * | 2019-01-21 | 2019-04-09 | 深圳市太美亚电子科技有限公司 | A kind of anti-dry control circuit of electronic cigarette |
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| CN110279149A (en) * | 2019-06-11 | 2019-09-27 | 深圳市长盈精密技术股份有限公司 | A kind of electronic smoke atomizer temperature-compensation circuit and control method |
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