CN107404107B - Dry burning prevention device of electronic cigarette and control method thereof - Google Patents
Dry burning prevention device of electronic cigarette and control method thereof Download PDFInfo
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- CN107404107B CN107404107B CN201710696887.6A CN201710696887A CN107404107B CN 107404107 B CN107404107 B CN 107404107B CN 201710696887 A CN201710696887 A CN 201710696887A CN 107404107 B CN107404107 B CN 107404107B
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
- A24F40/53—Monitoring, e.g. fault detection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/10—Devices using liquid inhalable precursors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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Abstract
The invention relates to an anti-dry heating device of an electronic cigarette and a control method thereof. The anti-dry burning device of the electronic cigarette comprises a microcontroller, a lifting pressure bridge circuit, an atomizer resistance value sampling circuit, an atomizer resistance value detection module and a battery power supply circuit, wherein the microcontroller is sequentially electrically connected with the lifting pressure bridge circuit, the atomizer resistance value sampling circuit, the atomizer and the atomizer resistance value detection module and then connected back to the microcontroller, the atomizer resistance value sampling circuit is also electrically connected with the atomizer resistance value detection module, a feedback circuit is connected between the atomizer resistance value sampling circuit and the lifting pressure bridge circuit and connected back to the microcontroller so that the microcontroller can adjust the output voltage of the lifting pressure bridge circuit and keep stable, when the electronic cigarette is in use and the tobacco juice is exhausted quickly, the atomizer resistance value detection module detects that the resistance value of the atomizer continuously exceeds the set times of dry burning protection set resistance value, the microcontroller instructs the lifting pressure bridge circuit to close the output, the electronic cigarette automatically stops working.
Description
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to an anti-dry heating device of an electronic cigarette and a control method thereof.
Background
The existing electronic cigarette generally comprises a suction nozzle, a shell, a liquid storage device, an atomization component, a power supply and a circuit control board, wherein the liquid storage device, the atomization component, the power supply and the circuit control board are sleeved in the shell, and a dry burning prevention protection module is not arranged. Present electron cigarette, all need manual cigarette liquid or change stock solution device of adding after the cigarette liquid is used up, just can continue to use, the cigarette liquid in the stock solution device is used up, the user does not in time add the cigarette liquid or change the stock solution device and when continuing the smoking, the circuit of circuit control board control still continues the work, make the heating module in the atomizing subassembly lead to the temperature sharply to rise and take place the dry combustion method because of lacking the cigarette liquid, thereby produce harmful gas and burnt flavor and be inhaled the human body, harmful health, the heat conduction of sharp production also burns out electron cigarette or scalds human skin to the all the other positions of electron cigarette easily in addition.
Disclosure of Invention
The invention aims to provide an anti-dry heating device of an electronic cigarette, which can not generate dry heating when a user continues smoking when smoke liquid in a liquid storage device of the electronic cigarette is used up. The invention also aims to provide an anti-dry heating control method with the anti-dry heating device.
The technical solution of the invention is as follows: the system comprises a microcontroller, a lifting voltage bridge circuit, an atomizer resistance value sampling circuit, an atomizer resistance value detection module and a battery power supply circuit, wherein the battery power supply circuit comprises a switch and a rechargeable battery, the microcontroller is sequentially electrically connected with the lifting voltage bridge circuit, the atomizer resistance value sampling circuit, the atomizer and the atomizer resistance value detection module and then connected back to the microcontroller, the atomizer resistance value sampling circuit is also electrically connected with the atomizer resistance value detection module, a feedback circuit is connected between the atomizer resistance value sampling circuit and the lifting voltage bridge circuit, and the feedback circuit is connected back to the microcontroller so that the microcontroller adjusts the output voltage of the lifting voltage bridge circuit and keeps stable; when the electronic cigarette works, the atomizer resistance detection module continuously detects the resistance of the atomizer according to the interval set time of the microcontroller, when the resistance of the atomizer continuously exceeds the dry burning protection set resistance and the continuous exceeding times reach the set times, the microcontroller instructs the lifting voltage bridge circuit to close the output, and the electronic cigarette automatically stops working.
Preferably, the method comprises the following steps: still include short circuit detection module, the atomizer inserts short circuit detection module, short circuit detection module inserts microcontroller.
Preferably, the method comprises the following steps: the charger is electrically connected with the charging circuit and the charger voltage detection module and then connected with the microcontroller, the charger is sequentially and electrically connected with the charging circuit and the battery power supply circuit, and the battery power supply circuit supplies power to the microcontroller and the lifting voltage bridge circuit respectively.
Preferably, the method comprises the following steps: the microcontroller is respectively and electrically connected with the LED control module and the auxiliary boosting module, and the auxiliary boosting module is connected to the lifting voltage bridge circuit.
Preferably, the method comprises the following steps: the charging circuit is also provided with a temperature sensor and a battery temperature detection module, when in charging, the temperature sensor detects a temperature signal of the battery and is connected to the battery temperature detection module, then the battery power supply circuit is connected to the microcontroller, and when the temperature signal exceeds a set temperature range value, the microcontroller instructs the charging circuit to stop charging; during discharging, when the temperature sensor detects that the temperature signal exceeds a set temperature range value, the microcontroller instructs the half-bridge boosting circuit or the chopping voltage reduction circuit to close output, and the electronic cigarette stops working.
Preferably, the method comprises the following steps: the atomizer resistance detection module comprises an operational amplifier U4Resistance R16Resistance R17Capacitor C12Resistance R19Capacitor C13Resistance R22Capacitor C14And a capacitor C15The atomizer resistance value sampling circuit comprises a resistor R18Said operational amplifier U4Has a first pin REF, a second pin GND, a third pin VCC, a fourth pin IN +, a fifth pin IN-and a sixth pin OUT, an operational amplifier U4The fourth pin IN + is respectively connected with a capacitor C12And a resistance R17The output end VOUT of the voltage-rising bridge circuit is connected with the rear part, and the fifth pin IN-is respectively connected with a capacitor C12And a resistance R16The rear connection atomizer output end PWM-OUT and the resistor R16Line junction and resistor R with output end PWM-OUT of atomizer17A resistor R is connected between the output end VOUT of the lifting voltage bridge circuit and a connecting wire node18And a sixth pin OUT of the operational amplifier U4 is connected with a resistor R19Then respectively connected with a current detection signal IDET and a capacitor C13Capacitor C13The other end is grounded and an operational amplifier U4The first pin REF and the second pin GND are grounded, and the operational amplifier U4Third pin VCC connecting resistor R22A rear access auxiliary boost VCC-12V, a third pin VCC and a resistor R22The nodes between the two are respectively connected with a capacitor C15And a capacitor C14Capacitor C15And a capacitor C14The other end of the first and second electrodes is grounded; when the current passes through the resistor R18While, the resistance R18Both ends can divide voltage and pass through a resistor R16Resistance R17Capacitor C12Performing primary filtering and inputting the filtered signal to an operational amplifier U4Fortune tellingU4Amplifying the filtered voltage and passing through a resistor R19Capacitor C13Filtering, and calculating the resistance value of the atomizer through the current detection signal IDET.
Preferably, the method comprises the following steps: the lifting voltage bridge circuit comprises a chip U1Chip U2MOS transistor Q1And Q2MOS transistor Q3And Q4A first voltage regulator diode, a second voltage regulator diode, and a resistor R1Resistance R2Resistance R3Capacitor C1Capacitor C3Capacitor C2Capacitor C4And an inductance L1Said chip U1First pin VCC connects electric capacity C3Rear ground, chip U1The third pin HO is connected into the MOS tube Q2Gate of (2), chip U1The tenth pin LO is connected to the MOS transistor Q1The chip U2First pin VCC connects electric capacity C4Rear ground, chip U2The third pin HO is connected into the MOS tube Q3Gate of (2), chip U2The tenth pin LO is connected to the MOS transistor Q4Gate of (2), chip U1Through inductor L1Access chip U2The fourth pin HS of, chip U1The second pins are respectively connected with a voltage stabilizing diode D1Capacitor C1Capacitor C1The other end is connected to a chip U1The fourth pin HS of (1), a zener diode D1The other end is connected to a chip U1First pin VCC, chip U2The second pins are respectively connected with a voltage stabilizing diode D2Capacitor C2Capacitor C2The other end is connected to a chip U2The fourth pin HS of (1), a zener diode D2The other end is connected to a chip U2First pin VCC, chip U1And chip U2The respective ninth pin VSS is grounded, and the chip U1The eighth pin IN is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller, and a chip U2The eighth pin IN is connected with a signal end PWM-DN of the voltage reduction output frequency of the microcontroller, and the chip U1And chip U2Respective seventh pin EN is connected with the output control signal end PWM of the lifting voltage bridgeEN, chip U2The seventh pin EN and the PWM-EN connection node of the output control signal end are connected with a resistor R3Rear ground, chip U1RDT of the sixth pin is connected with a resistor R1Rear ground, chip U2RDT of the sixth pin is connected with a resistor R2Then grounding; when the voltage of the battery is lower than the output voltage, the buck-boost bridge circuit buck drives the chip U2MOS transistor Q is opened to output signal3Through an inductance L1Connecting chip U1MOS transistor Q1And Q2Boost driving chip U1The microcontroller outputs PWM-UP control signal to drive MOS tube Q1And Q2Boosting and outputting VOUT; on the contrary, when the battery voltage is higher than the output voltage, the boost bridge circuit boosts the voltage to drive the chip U1MOS transistor Q is opened to output signal2Through an inductance L1Connecting chip U2MOS transistor Q4And Q3Voltage-reducing driving chip U2The MOS transistor Q is driven by a microcontroller to output a PWM-DN control signal4And Q3And step-down output VOUT.
The invention also provides a technical solution of the control method for preventing the dry burning of the electronic cigarette, which is characterized by comprising the following steps:
⑴ when the electronic cigarette starts to work, the microcontroller judges whether the switch closing time exceeds the set time, if not, the step ⑽ is executed, if yes, the next step is executed;
⑵ the microcontroller makes the buck-boost bridge circuit output voltage signal;
⑶ the microcontroller counts the times that the resistance value of the atomizer continuously exceeds the set resistance value of the dry burning protection as zero;
⑷ the microcontroller starts timing and judges whether the interval set time for measuring the resistance value of the atomizer is reached, if not, the timing is continued and the judgment is carried out, if yes, the next step is carried out;
⑸ the microcontroller instructs the atomizer resistance value detection module to detect the atomizer resistance value;
⑹, after detecting the resistance value of the atomizer, the microcontroller judges whether the resistance value of the atomizer exceeds the set resistance value of the dry burning protection, if not, the step ⑶ is returned, if yes, the next step is carried out;
⑺ the microcontroller continuously exceeds the resistance of the atomizer in the previous step by +1 times of the set resistance of the dry burning protection;
⑻ the microcontroller judges whether the accumulated times of continuously exceeding the set resistance of the dry burning protection reaches the set times, if not, the step ⑷ is returned, if yes, the next step is carried out;
⑼ judging the state of the electronic cigarette to be a dry burning state by the microcontroller;
⑽ the output of the voltage-bridge circuit is closed and the electronic cigarette stops working.
Compared with the prior art, the invention has the beneficial effects that:
this electron cigarette is equipped with prevents dry combustion method device, wherein be equipped with lift pressure bridge circuit, atomizer resistance sampling circuit and atomizer resistance detection module, the resistance signal of the heat-generating body resistance in the detectable atomizer, continue work because of lacking the tobacco juice when the atomizer, lead to the resistance of atomizer to exceed when the temperature sharply risees and dry the protection and set for the resistance and when the number of times that surpass reaches the set for number of times in succession, the dry combustion method device of electron cigarette makes the power output who judges and in time cut off lift pressure bridge circuit, prevent that the atomizer from taking place to dry the fever, thereby prevent that harmful gas and burnt flavor from being inhaled the human body and endangering the health, and avoid the electron cigarette burnt or scald the human body.
Drawings
Fig. 1 is a circuit block diagram of an anti-dry heating device of an electronic cigarette according to the present invention;
FIG. 2 is a schematic circuit diagram of an atomizer resistance detection module of the present invention;
FIG. 3 is a circuit schematic of the buck-boost bridge circuit of the present invention;
fig. 4 is a flowchart of the dry burning prevention control method for the electronic cigarette according to the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings:
fig. 1 shows an anti-dry heating device of an electronic cigarette of the present invention.
Referring to fig. 1, the dry burning prevention device for the electronic cigarette comprises a microcontroller, a lifting voltage bridge circuit, an atomizer resistance value sampling circuit, an atomizer resistance value detection module and a battery power supply circuit, wherein the battery power supply circuit comprises a switch and a rechargeable battery, the microcontroller is electrically connected with the lifting voltage bridge circuit, the atomizer resistance value sampling circuit, the atomizer and the atomizer resistance value detection module in sequence and then connected back to the microcontroller, the atomizer resistance value sampling circuit is also electrically connected with the atomizer resistance value detection module, a feedback circuit is connected between the atomizer resistance value sampling circuit and the lifting voltage bridge circuit and connected back to the microcontroller, so that the microcontroller adjusts the output voltage of the lifting voltage bridge circuit and keeps stable; when the electronic cigarette works, the atomizer resistance detection module continuously detects the resistance of the atomizer according to the interval set time of the microcontroller, when the resistance of the atomizer continuously exceeds the dry burning protection set resistance and the continuous exceeding times reach the set times, the microcontroller instructs the lifting voltage bridge circuit to close the output, and the electronic cigarette automatically stops working. The meaning of the set detection resistance value continuously exceeding the dry combustion protection set resistance value and continuously exceeding the set resistance value to reach the set times is that unnecessary dry combustion protection caused by the rise of the atomizer resistance value due to accidental factors can be avoided. Because sometimes when the cigarette liquid in the electronic cigarette can not be burnt, accidental factors exist to cause that the resistance value of the atomizer measured once or twice occasionally exceeds the set resistance value of the dry burning protection instantly, if the situation is that the dry burning protection is started to stop the work of the electronic cigarette, the situation is obviously not in accordance with the actual situation, and bad use experience is brought to users. Only when the resistance values of the atomizer detected for a plurality of times continuously exceed the set resistance value of the dry burning protection and reach the set times, the objective condition of the dry burning can be really reflected, and the dry burning protection can be carried out only by shutting down.
In the anti-dry heating device of the electronic cigarette, the atomizer comprises a thermosensitive electric heating wire (not shown) in the heating unit, and the resistance of the thermosensitive electric heating wire changes along with the temperature change, so that the corresponding temperature value can be calculated by detecting the resistance value of the resistance.
Referring to fig. 1, the anti-dry heating device of the electronic cigarette further includes a short circuit detection module, the atomizer is connected to the short circuit detection module, and the short circuit detection module is connected to the microcontroller. The short circuit detection module is used for detecting whether the thermosensitive heating wire of the atomizer is short-circuited, if the short circuit occurs, the microcontroller can instruct the lifting pressure bridge circuit to close output for protection, and the electronic cigarette stops working.
Referring to fig. 1, the anti-dry burning device for the electronic cigarette further comprises a charging circuit, a charger and a charger voltage detection module, wherein the microcontroller is electrically connected with the charging circuit, the charger is electrically connected with the charger voltage detection module and then is connected with the microcontroller, the charger is sequentially electrically connected with the charging circuit and a battery power supply circuit, and the battery power supply circuit respectively supplies power to the microcontroller and the lifting voltage bridge circuit. The charging voltage detection module works during charging to prevent the charger from being overcharged.
Referring to fig. 1, in the dry-burning prevention device for the electronic cigarette, the microcontroller is electrically connected with the LED control module and the auxiliary boost module respectively, and the auxiliary boost module is connected to the lifting voltage bridge circuit. The LED control module is used for controlling the LED indicating lamp to indicate different brightness or different colors or a combination of the brightness and the color of the smoking state, the switch detection module is used for detecting the closing state or closing time of the key switch, and the auxiliary boosting module is used for compensating or assisting the lifting bridge circuit to boost better.
Referring to fig. 1, the anti-dry heating device of the electronic cigarette is further provided with a temperature sensor and a battery temperature detection module, wherein during charging, the temperature sensor detects a temperature signal of a battery and is connected to the battery temperature detection module, and then is connected to the microcontroller through the battery power supply circuit, and when the temperature signal exceeds a set temperature range value, the microcontroller instructs the charging circuit to stop charging; during discharging, when the temperature sensor detects that the temperature signal exceeds a set temperature range value, the microcontroller instructs the half-bridge boosting circuit or the chopping voltage reduction circuit to close output, and the electronic cigarette stops working. The battery temperature detection module is used for detecting the temperature of the battery during charging and discharging, and avoids the danger of damage or explosion caused by overhigh temperature of the battery.
Referring to fig. 2, the atomizer resistance detection module includes an operational amplifier U4Resistance R16Resistance R17Capacitor C12Resistance R19Capacitor C13Resistance R22Capacitor C14And a capacitor C15The atomizer resistance value sampling circuit comprises a resistor R18Operational amplifier U4Has a first pin REF, a second pin GND, a third pin VCC, a fourth pin IN +, a fifth pin IN-and a sixth pin OUT, an operational amplifier U4The fourth pin IN + is respectively connected with a capacitor C12And a resistance R17The output end VOUT of the voltage-rising bridge circuit is connected with the rear part, and the fifth pin IN-is respectively connected with a capacitor C12And a resistance R16The rear connection atomizer output end PWM-OUT and the resistor R16Line junction and resistor R with output end PWM-OUT of atomizer17A resistor R is connected between the output end VOUT of the lifting voltage bridge circuit and a connecting wire node18And a sixth pin OUT of the operational amplifier U4 is connected with a resistor R19Then respectively connected with a current detection signal IDET and a capacitor C13Capacitor C13The other end is grounded and an operational amplifier U4The first pin REF and the second pin GND are grounded, and the operational amplifier U4Third pin VCC connecting resistor R22A rear access auxiliary boost VCC-12V, a third pin VCC and a resistor R22The nodes between the two are respectively connected with a capacitor C15And a capacitor C14Capacitor C15And a capacitor C14The other end of the first and second electrodes is grounded; when the current passes through the resistor R18While, the resistance R18Both ends can divide voltage and pass through a resistor R16Resistance R17Capacitor C12Performing primary filtering and inputting the filtered signal to an operational amplifier U4Operational amplifier U4Amplifying the filtered voltage and passing through a resistor R19Capacitor C13Filtering, and calculating the resistance value of the atomizer through the current detection signal IDET.
Referring to fig. 3, the bridge-pull-up/down circuit includes a chip U1Chip U2MOS transistor Q1And Q2MOS transistor Q3And Q4A first voltage regulator diode, a second voltage regulator diode, and a resistor R1Resistance R2Resistance R3Capacitor C1Capacitor C3Capacitor C2Capacitor C4And an inductance L1Chip U1First pin VCC connects electric capacity C3Rear ground, chip U1The third pin HO is connected into the MOS tube Q2Gate of (2), chip U1The tenth pin LO is connected to the MOS transistor Q1Gate of (2), chip U2First pin VCC connects electric capacity C4Rear ground, chip U2The third pin HO is connected into the MOS tube Q3Gate of (2), chip U2The tenth pin LO is connected to the MOS transistor Q4Gate of (2), chip U1Through inductor L1Access chip U2The fourth pin HS of, chip U1The second pins are respectively connected with a voltage stabilizing diode D1Capacitor C1Capacitor C1The other end is connected to a chip U1The fourth pin HS of (1), a zener diode D1The other end is connected to a chip U1First pin VCC, chip U2The second pins are respectively connected with a voltage stabilizing diode D2Capacitor C2Capacitor C2The other end is connected to a chip U2The fourth pin HS of (1), a zener diode D2The other end is connected to a chip U2First pin VCC, chip U1And chip U2The respective ninth pin VSS is grounded, and the chip U1The eighth pin IN is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller, and a chip U2The eighth pin IN is connected with a signal end PWM-DN of the voltage reduction output frequency of the microcontroller, and the chip U1And chip U2Respective seventh pin EN is connected with an output control signal end PWM-EN of the lifting voltage bridge, and a chip U2The seventh pin EN and the PWM-EN connection node of the output control signal end are connected with a resistor R3Rear ground, chip U1RDT of the sixth pin is connected with a resistor R1Rear ground, chip U2RDT of the sixth pin is connected with a resistor R2Then grounding; when the voltage of the battery is lower than the output voltage, the buck-boost bridge circuit buck drives the chip U2MOS transistor Q is opened to output signal3Through an inductance L1Connecting chip U1MOS transistor Q1And Q2Boost driving chip U1The microcontroller outputs PWM-UP control signal to drive MOS tube Q1And Q2Boosting and outputting VOUT; on the contrary, whenWhen the battery voltage is higher than the output voltage, the boost bridge circuit boosts the driving chip U1MOS transistor Q is opened to output signal2Through an inductance L1Connecting chip U2MOS transistor Q4And Q3Voltage-reducing driving chip U2The MOS transistor Q is driven by a microcontroller to output a PWM-DN control signal4And Q3And step-down output VOUT.
Referring to fig. 4, the method for controlling dry burning prevention of an electronic cigarette according to the present invention includes the following steps:
⑴ when the electronic cigarette starts to work, the microcontroller judges whether the switch closing time exceeds the set time, such as 0.3 ms, if not, the step ⑽ is entered, if yes, the next step is entered;
in the step, if the closing time of the switch does not exceed the set switching time by 0.3 second, the switch is indicated to be touched by mistake, the chopper step-down circuit does not output, the atomizer heating unit of the electronic cigarette does not work, and if the closing time of the switch exceeds 0.3 second, the switch is indicated to be closed manually;
⑵ the microcontroller makes the output terminal VOUT of the voltage-reducing bridge circuit output voltage signal;
in the step, the voltage signal output by the lifting voltage bridge circuit is that the atomizer starts to work;
⑶ the microcontroller counts the times that the resistance value of the atomizer continuously exceeds the set resistance value of the dry burning protection as zero;
⑷ the microcontroller starts timing and judges whether the interval set time for measuring the resistance value of the atomizer is reached, such as 3 milliseconds, if not, the timing is continued and the judgment is carried out, if yes, the next step is carried out;
in the step, the resistor measurement timing is performed once at intervals when the resistance value of the heating unit is measured, and the interval time is set in the microcontroller for 3 ms;
⑸ the microcontroller instructs the atomizer resistance value detection module to detect the atomizer resistance value;
in the step, the detection of the resistor by the atomizer resistance detection module is realized by detecting current;
⑹ detecting the resistance value of the atomizer, the microcontroller judges whether the resistance value of the atomizer exceeds the set resistance value of the dry burning protection, such as 0.75 ohm, if not, the step ⑶ is returned, if yes, the next step is carried out;
⑺ the microcontroller continuously exceeds the resistance of the atomizer in the previous step by +1 times of the set resistance of the dry burning protection;
accumulating the times that the measured resistance value continuously exceeds the set resistance value;
⑻ the microcontroller judges whether the accumulated times of continuously exceeding the set resistance of the dry burning protection reaches the set times, if not, the step ⑷ is returned, if yes, the next step is carried out;
in the step, only when the resistance values of the atomizer detected for a plurality of times continuously exceed the set resistance value of the dry burning protection and reach the set times, the atomizer is indicated to lack smoke liquid and generate dry burning;
⑼ judging the state of the electronic cigarette to be a dry burning state by the microcontroller;
⑽ the output of the voltage-bridge circuit is closed and the electronic cigarette stops working.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
1. An anti-dry burning device of an electronic cigarette is characterized by comprising a microcontroller, a lifting bridge pressing circuit, an atomizer resistance value sampling circuit, an atomizer resistance value detection module, a battery power supply circuit and a switch detection module, the battery power supply circuit comprises a switch and a rechargeable battery, the switch detection module is used for detecting the closing state or closing time of the key switch, the microcontroller is electrically connected with the lifting bridge-pressing circuit, the atomizer resistance value sampling circuit, the atomizer and the atomizer resistance value detection module in turn and then is connected back to the microcontroller, the atomizer resistance value sampling circuit is also electrically connected with an atomizer resistance value detection module, a feedback circuit is connected between the atomizer resistance value sampling circuit and the lifting voltage bridge circuit, the feedback circuit is connected back to the microcontroller so that the microcontroller can adjust the output voltage of the step-up and step-down voltage bridge circuit and keep the output voltage stable; when the electronic cigarette works, the atomizer resistance value detection module continuously detects the resistance value of the atomizer according to the interval set time of the microcontroller, when the resistance value of the atomizer continuously exceeds the dry combustion protection set resistance value and the continuously exceeding times reach the set times, the microcontroller instructs the lifting voltage bridge circuit to close the output, and the electronic cigarette automatically stops working;
the atomizer resistance detection module comprises an operational amplifier U4Resistance R16Resistance R17Capacitor C12Resistance R19Capacitor C13Resistance R22Capacitor C14And a capacitor C15The atomizer resistance value sampling circuit comprises a resistor R18Said operational amplifier U4Has a first pin REF, a second pin GND, a third pin VCC, a fourth pin IN +, a fifth pin IN-and a sixth pin OUT, an operational amplifier U4The fourth pin IN + is respectively connected with a capacitor C12And a resistor R17The output end VOUT of the voltage-rising bridge circuit is connected with the rear part, and the fifth pin IN-is respectively connected with a capacitor C12Another terminal of (1) and a resistor R16The rear connection atomizer output end PWM-OUT and the resistor R16Line junction and resistor R with output end PWM-OUT of atomizer17A resistor R is connected between the output end VOUT of the lifting voltage bridge circuit and a connecting wire node18And a sixth pin OUT of the operational amplifier U4 is connected with a resistor R19Then respectively connected with a current detection signal IDET and a capacitor C13One terminal of (1), a capacitor C13The other end is grounded and an operational amplifier U4The first pin REF and the second pin GND are grounded, and the operational amplifier U4Third pin VCC connecting resistor R22A rear access auxiliary boost end VCC-12V, a third pin VCC and a resistor R22The nodes between the two are respectively connected with a capacitor C15And a capacitor C14Capacitor C15And a capacitor C14The other end of the first and second electrodes is grounded; when the current passes through the resistor R18While, the resistance R18Both ends can divide voltage and pass through a resistor R16Resistance R17Capacitor C12Performing primary filtering and inputting the filtered signal to an operational amplifier U4Operational amplifier U4Amplifying the filtered voltage and passing through a resistor R19Capacitor C13Filtering, and calculating the resistance value of the atomizer through the current detection signal IDET.
2. The anti-dry heating device of the electronic cigarette according to claim 1, further comprising a short circuit detection module, wherein the atomizer is connected to the short circuit detection module, and the short circuit detection module is connected to the microcontroller.
3. The anti-dry burning device of the electronic cigarette according to claim 1, further comprising a charging circuit, a charger, and a charger voltage detection module, wherein the microcontroller is electrically connected to the charging circuit, the charger is electrically connected to the charger voltage detection module and then connected to the microcontroller, the charger is electrically connected to the charging circuit and a battery power supply circuit in turn, and the battery power supply circuit supplies power to the microcontroller and the step-up/step-down bridge circuit, respectively.
4. The anti-dry burning device of the electronic cigarette according to claim 1, wherein the microcontroller is electrically connected to the LED control module and the auxiliary boost module, respectively, and the auxiliary boost module is connected to the boost bridge circuit.
5. The device of claim 3, further comprising a temperature sensor and a battery temperature detection module, wherein the temperature sensor is electrically connected to the battery temperature detection module, the battery temperature detection module is electrically connected to the battery power supply circuit, the battery power supply circuit is electrically connected to the microcontroller, when charging, the temperature sensor detects a temperature signal of the battery and is connected to the battery temperature detection module, and then is connected to the microcontroller through the battery power supply circuit, and when the temperature signal exceeds a set temperature range, the microcontroller instructs the charging circuit to stop charging; during discharging, when the temperature sensor detects that the temperature signal exceeds a set temperature range value, the microcontroller instructs the lifting pressure bridge circuit to close output, and the electronic cigarette stops working.
6. According to claim1 the anti-dry burning device of the electronic cigarette is characterized in that the lifting pressure bridge circuit comprises a chip U1Chip U2MOS transistor Q1And Q2MOS transistor Q3And Q4A first voltage regulator diode, a second voltage regulator diode, and a resistor R1Resistance R2Resistance R3Capacitor C1Capacitor C3Capacitor C2Capacitor C4And an inductance L1Said chip U1First pin VCC connects electric capacity C3Rear ground, chip U1The third pin HO is connected into the MOS tube Q2Gate of (2), chip U1The tenth pin LO is connected to the MOS transistor Q1The chip U2First pin VCC connects electric capacity C4Rear ground, chip U2The third pin HO is connected into the MOS tube Q3Gate of (2), chip U2The tenth pin LO is connected to the MOS transistor Q4Gate of (2), chip U1Through inductor L1Access chip U2The fourth pin HS of, chip U1The second pins are respectively connected with a voltage stabilizing diode D1One terminal of (1), a capacitor C1One terminal of (C), a capacitor1The other end is connected to a chip U1The fourth pin HS of (1), a zener diode D1The other end is connected to a chip U1First pin VCC, chip U2The second pins are respectively connected with a voltage stabilizing diode D2One terminal of (1), a capacitor C2One terminal of (C), a capacitor2The other end is connected to a chip U2The fourth pin HS of (1), a zener diode D2The other end is connected to a chip U2First pin VCC, chip U1And chip U2The respective ninth pin VSS is grounded, and the chip U1The eighth pin IN is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller, and a chip U2The eighth pin IN is connected with a signal end PWM-DN of the voltage reduction output frequency of the microcontroller, and the chip U1And chip U2Respective seventh pins EN are connected with an output control signal end PWM-EN of the lifting voltage bridge circuit, and a chip U2The seventh pin EN and the PWM-EN connection node of the output control signal end are connected with a resistor R3Rear grounded, chipU1RDT of the sixth pin is connected with a resistor R1Rear ground, chip U2RDT of the sixth pin is connected with a resistor R2Then grounding; when the voltage of the battery is lower than the output voltage, the buck-boost bridge circuit buck drives the chip U2MOS transistor Q is opened to output signal3Through an inductance L1Connecting chip U1MOS transistor Q1And Q2Boost driving chip U1The microcontroller outputs PWM-UP control signal to drive MOS tube Q1And Q2Boosting and outputting VOUT; on the contrary, when the battery voltage is higher than the output voltage, the boost bridge circuit boosts the voltage to drive the chip U1MOS transistor Q is opened to output signal2Through an inductance L1Connecting chip U2MOS transistor Q4And Q3Voltage-reducing driving chip U2The MOS transistor Q is driven by a microcontroller to output a PWM-DN control signal4And Q3And step-down output VOUT.
7. A method for controlling the anti-dry heating device of the electronic cigarette according to any one of claims 1 to 6, comprising the steps of:
⑴ when the electronic cigarette starts to work, the microcontroller judges whether the switch closing time exceeds the set time, if not, the step ⑽ is executed, if yes, the next step is executed;
⑵ the microcontroller makes the buck-boost bridge circuit output voltage signal;
⑶ the microcontroller counts the times that the resistance value of the atomizer continuously exceeds the set resistance value of the dry burning protection as zero;
⑷ the microcontroller starts timing and judges whether the interval set time for measuring the resistance value of the atomizer is reached, if not, the timing is continued and the judgment is carried out, if yes, the next step is carried out;
⑸ the microcontroller instructs the atomizer resistance value detection module to detect the atomizer resistance value;
⑹, after detecting the resistance value of the atomizer, the microcontroller judges whether the resistance value of the atomizer exceeds the set resistance value of the dry burning protection, if not, the step ⑶ is returned, if yes, the next step is carried out;
⑺ the microcontroller continuously exceeds the resistance of the atomizer in the previous step by +1 times of the set resistance of the dry burning protection;
⑻ the microcontroller judges whether the accumulated times of continuously exceeding the set resistance of the dry burning protection reaches the set times, if not, the step ⑷ is returned, if yes, the next step is carried out;
⑼ judging the state of the electronic cigarette to be a dry burning state by the microcontroller;
⑽ the output of the voltage-bridge circuit is closed and the electronic cigarette stops working.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696887.6A CN107404107B (en) | 2017-08-15 | 2017-08-15 | Dry burning prevention device of electronic cigarette and control method thereof |
| PCT/CN2018/096061 WO2019033887A1 (en) | 2017-08-15 | 2018-07-18 | Dry-burning prevention device of electronic cigarette and control method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710696887.6A CN107404107B (en) | 2017-08-15 | 2017-08-15 | Dry burning prevention device of electronic cigarette and control method thereof |
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| CN107404107A CN107404107A (en) | 2017-11-28 |
| CN107404107B true CN107404107B (en) | 2020-02-14 |
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| CN201710696887.6A Active CN107404107B (en) | 2017-08-15 | 2017-08-15 | Dry burning prevention device of electronic cigarette and control method thereof |
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| WO2019033887A1 (en) | 2019-02-21 |
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