CN107467718B - Heating device of electronic smoking set and control method thereof - Google Patents
Heating device of electronic smoking set and control method thereof Download PDFInfo
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- CN107467718B CN107467718B CN201710697338.0A CN201710697338A CN107467718B CN 107467718 B CN107467718 B CN 107467718B CN 201710697338 A CN201710697338 A CN 201710697338A CN 107467718 B CN107467718 B CN 107467718B
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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
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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
- A24F40/20—Devices using solid inhalable precursors
Abstract
The invention relates to a heating device of an electronic smoking set and a control method thereof, wherein a microcontroller of the heating device of the electronic smoking set is sequentially and electrically connected with a buck-boost bridge circuit, a heating unit resistance sampling circuit, a heating unit and a heating unit resistance detection module, and then is connected back to the microcontroller, the heating unit sampling circuit is connected with the resistance detection module, a feedback circuit is connected between the buck-boost bridge circuit and the heating unit, the feedback circuit is connected back to the microcontroller, when the temperature of the heating unit changes in the use process of the electronic smoking set, the resistance of the heating unit is correspondingly changed, the heating unit resistance detection module detects the resistance of the heating unit and is converted into a corresponding temperature electric signal to be transmitted to the microcontroller, and the microcontroller sends a control signal to the buck-boost bridge circuit after comparing the temperature electric signal with a set temperature value, so that the output voltage of the buck-boost bridge circuit changes, and the power of the heating unit also changes, thereby adjusting the temperature stability of the heating unit.
Description
Technical Field
The invention relates to the technical field of electronic smoking sets, in particular to a heating device of an electronic smoking set and a control method thereof.
Background
The common cigarettes emit cigarette smoke for a smoker to inhale during open flame combustion, and the cigarettes decompose and generate harmful substances such as tar, carbon monoxide, phenol, nitrogen oxides, olefin substances, polycyclic aromatic hydrocarbon substances and the like during open flame combustion, and the substances seriously damage human health.
In order to avoid that a great amount of harmful substances are generated by cigarettes and the cigarettes can enjoy the unique taste of the cigarettes, an electronic smoking set capable of assisting in smoking is generated on the market, and the electronic smoking set has the functions that when a user smokes, the tobacco products (such as cigarettes and tobacco cores) are placed in the electronic smoking set to electrically heat, the tobacco products are baked at a temperature lower than the combustible temperature of the tobacco products until smoking is performed, and the user can inhale cigarette smoke. Because the tobacco products are burnt through heating and smoking rather than open fire, a great deal of harmful substances generated by the open fire burning of the tobacco products are prevented from being inhaled by users, and therefore the electronic smoking set is widely used for smoking.
The existing electronic smoking set generally heats the outer wall of the cigarette body with constant voltage through a heating pipe in a standby state or a smoking state, the heat conduction is slow, the whole temperature of the cigarette body is slowly raised, the sucked smoke quantity is small, but after the temperature is raised, the heating cup is closely attached to the outer wall of the cigarette body to continuously heat, the heat is slowly conducted inwards through the outer wall of the cigarette body, the temperature of one side of the outer wall of the cigarette body is too high, and the burnt smell is easily generated.
Disclosure of Invention
The invention aims to provide a heating device of an electronic smoking set, which can adjust the stability of heating temperature. Another object of the present invention is to provide a method for controlling a heating device of an electronic smoking set.
The technical scheme of the invention is that the heating device of the electronic smoking set is characterized by comprising a microcontroller, a battery power supply circuit, a buck-boost bridge circuit, a heating unit resistance sampling circuit and a heating unit resistance detection module, wherein the battery power supply circuit comprises a switch and a chargeable battery, the microcontroller is sequentially and electrically connected with the buck-boost bridge circuit, the heating unit resistance sampling circuit, the heating unit and the heating unit resistance detection module and then connected with the microcontroller, the heating unit sampling circuit is connected with the resistance detection module, a feedback circuit is connected between the buck-boost bridge circuit and the heating unit, the feedback circuit is connected with the microcontroller, the resistance of the heating unit correspondingly changes when the temperature of the heating unit changes in the use process of the electronic smoking set, the heating unit resistance detection module detects the resistance of the heating unit and converts the resistance into a corresponding temperature electric signal to the microcontroller, and the microcontroller sends a control signal to the buck-boost bridge circuit after comparing the temperature electric signal with a set temperature value, so that the output voltage of the buck-boost bridge circuit changes, the power of the heating unit also changes, and the temperature of the heating unit is regulated to be stable.
As preferable: the power supply system further comprises an auxiliary boost module, wherein the microcontroller is connected to the input end of the auxiliary boost module, and the output end of the auxiliary boost module is connected to the boost-buck bridge circuit.
As preferable: the heating unit is electrically connected with the short circuit detection module, and the short circuit detection module is connected with the microcontroller.
As preferable: the microcontroller is electrically connected with the charging circuit, the charger is electrically connected with the charging voltage detection module and then connected with the microcontroller, the charger is 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 buck-boost bridge circuit respectively.
As preferable: the microcontroller is also respectively and electrically connected with the LED control module, the switch detection module and the motor vibration control module.
As preferable: the heating unit resistance detection module comprises an operational amplifier U 4 Resistance R 16 Resistance R 17 Capacitance C 12 Resistance R 19 Capacitance C 13 Resistance R 22 Capacitance C 14 And capacitor C 15 The heating unit resistance sampling circuit comprises a resistor R 18 The operational amplifier U 4 The operational amplifier U is provided with 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 4 The fourth pins IN+ of (a) are respectively connected with the capacitor C 12 And resistance R 17 The output end VOUT of the buck-boost bridge circuit is connected at the rear, and the fifth pin IN-is respectively connected with the capacitor C 12 And resistance R 16 After that, the heating unit sampling circuit output end PWM-OUT and the resistor R are connected 16 Connection node and resistor R with output end PWM-OUT of heating unit sampling circuit 17 Resistor R is connected between the connecting node of output end VOUT of buck-boost bridge circuit 18 Sixth pin OUT connection resistor R of operational amplifier U4 19 Then respectively switching in a current detection signal IDET and a capacitor C 13 Capacitance C 13 The other end is grounded, and the operational amplifier U 4 The first pin REF and the second pin GND are grounded, and the operational amplifier U 4 Third pin VCC connection resistor R of (C) 22 After accessing auxiliary boost VCC-12V, a third pin VCC and a resistor R 22 The nodes between the capacitors are respectively connected with a capacitor C 15 And capacitor C 14 Capacitance C 15 And capacitor C 14 The other end of the first electrode is grounded; when the current passes through the resistor R 18 Resistance R at the time 18 The two ends will be divided voltage and pass through resistor R 16 Resistance R 17 Capacitance C 12 Filtering once and inputting to operational amplifier U 4 U is put to fortune 4 Amplifying and passing the filtered voltageResistor R 19 Capacitance C 13 Filtering, and calculating the resistance of the heating unit through the current detection signal IDET.
As preferable: the buck-boost bridge circuit comprises a chip U 1 Chip U 2 MOS tube Q 1 And Q 2 MOS tube Q 3 And Q 4 A first zener diode, a second zener diode, a resistor R 1 Resistance R 2 Resistance R 3 Capacitance C 1 Capacitance C 3 Capacitance C 2 Capacitance C 4 And inductance L 1 The chip U 1 The first pin VCC of (C) is connected with the capacitor C 3 Rear ground, chip U 1 Is accessed into MOS tube Q by third pin HO 2 Gate of (c), chip U 1 Is connected with MOS tube Q through LO at tenth pin 1 Gate of the chip U 2 The first pin VCC of (C) is connected with the capacitor C 4 Rear ground, chip U 2 Is accessed into MOS tube Q by third pin HO 3 Gate of (c), chip U 2 Is connected with MOS tube Q through LO at tenth pin 4 Gate of (c), chip U 1 Through inductance L 1 Access chip U 2 Fourth pin HS, chip U 1 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 1 Capacitance C 1 Capacitance C 1 The other end is connected with the chip U 1 Fourth pin HS of zener diode D 1 The other end is connected with the chip U 1 The first pin VCC of (C), the chip U 2 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 2 Capacitance C 2 Capacitance C 2 The other end is connected with the chip U 2 Fourth pin HS of zener diode D 2 The other end is connected with the chip U 2 The first pin VCC of (C), the chip U 1 And chip U 2 The ninth pins VSS are grounded, and the chip U 1 The eighth pin IN of the (B) is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller and a chip U 2 The eighth pin IN of the (E) is connected with the signal end PWM-DN of the voltage-reducing output frequency of the microcontroller, and the chip U 1 And chip U 2 The seventh pins EN are respectively connected with an output control signal end PWM-EN of the buck-boost bridge circuit and the chip U 2 Connection node of seventh pin EN and output control signal end PWM-EN is connected with resistor R 3 Rear ground, chip U 1 The sixth pin RDT of (1) is connected with the resistor R 1 Rear ground, chip U 2 The sixth pin RDT of (1) is connected with the resistor R 2 Rear ground; when the battery voltage is lower than the output voltage, the buck-boost bridge circuit steps down the driving chip U 2 Output signal opens MOS pipe Q 3 Through inductance L 1 Connection chip U 1 MOS tube Q 1 And Q 2 Boost driving chip U 1 The micro controller outputs PWM-UP control signals to drive the MOS transistor Q 1 And Q 2 The boost output VOUT; conversely, when the battery voltage is higher than the output voltage, the boost-buck circuit boosts the driving chip U 1 Output signal opens MOS pipe Q 2 Through inductance L 1 Connection chip U 2 MOS tube Q 4 And Q 3 Step-down driving chip U 2 The micro controller outputs PWM-DN control signals to drive the MOS transistor Q 4 And Q 3 And step down the voltage output VOUT.
The other technical proposal of the invention is a control method of the heating device of the electronic smoking set, which is characterized by comprising the following steps:
when an electronic smoking set starts to work, a microcontroller judges whether the time for closing a switch exceeds the set time, if not, the step is selected, and if so, the next step is performed;
the step-up and step-down bridge circuit outputs a voltage signal;
thirdly, starting working timing by the microcontroller and judging whether the set working time is up, if so, entering a step, otherwise, entering a next step;
the microcontroller starts to measure resistance timing and judges whether the set interval time for measuring the resistance value of the heating unit is reached, if not, the timing is continued and judgment is carried out, and if so, the next step is carried out;
the heating unit resistance detection module detects the heating unit resistance, and the microcontroller calculates a corresponding temperature value according to the detected heating unit resistance and calculates a temperature change rate at the same time;
the method comprises the steps of sixthly, judging whether the temperature change rate is larger than or equal to a set temperature change rate value, if so, indicating that the electronic smoking set is in a smoking state, and entering the next step; if not, indicating that the electronic smoking set is in a standby state, and entering a step I;
comparing the temperature value with a set smoking temperature value, and if the temperature value is equal to the set smoking temperature value, entering the next step; if the temperature is smaller than the set smoking temperature value, the step I is carried out; if the temperature is larger than the set smoking temperature value, entering a step I;
the step-up and step-down bridge circuit is controlled by the microcontroller to maintain voltage output, and the step is returned to;
the voltage output of the buck-boost bridge circuit is increased through the microcontroller, so that the power of the heating unit is increased, the temperature is increased, and the step is returned;
the voltage output of the buck-boost bridge circuit is reduced through the microcontroller, so that the power of the heating unit is reduced, the temperature is reduced, and the step is returned;
judging whether the temperature change rate is continuously smaller than the set temperature change rate value or not, if so, entering a step B, if not, entering a next step;
comparing the temperature value with a set standby temperature value, and if the temperature value is equal to the set standby temperature value, entering a step F; if the temperature is smaller than the set standby temperature value, entering step I; if the temperature is larger than the set standby temperature value, entering a step I;
and closing the voltage output of the buck-boost bridge circuit, and stopping the electronic smoking set.
Compared with the prior art, the invention has the beneficial effects that:
the heating device of the electronic smoking set is provided with a microcontroller, a battery power supply circuit, a lifting bridge circuit, a heating unit resistance sampling circuit and a heating unit resistance detection module, wherein the resistance also changes correspondingly when the temperature of the heating unit changes, the heating unit resistance detection module detects the resistance of the heating unit and converts the resistance into corresponding temperature electric signals to be transmitted to the microcontroller, and the microcontroller sends control signals to the lifting bridge circuit after comparing the temperature electric signals with the set temperature values, so that the output voltage of the lifting bridge circuit rises or falls, and the power of the heating unit also changes correspondingly to adjust the temperature of the heating unit and keep stable. In addition, the microcontroller sets two temperature setting values of smoking and standby to differentially control the heating temperature of the heating unit in smoking and standby, so that the heating requirement in normal smoking can be ensured, and the condition that the heating unit in standby is always heated to cause too high temperature to burn cigarettes can be avoided.
Drawings
FIG. 1 is a circuit block diagram of a heating device of an electronic smoking article of the present invention;
FIG. 2 is a schematic circuit diagram of a resistance detection module of a heating unit according to the present invention;
FIG. 3 is a schematic circuit diagram of a buck-boost bridge circuit of the present invention;
fig. 4 is a flowchart of a control method of the heating device of the electronic smoking set of the present invention.
Detailed Description
The invention will be further described in detail below with reference to the accompanying drawings:
fig. 1 shows a heating device of the electronic smoking article of the invention.
Referring to fig. 1, the heating device of the electronic smoking set includes a microcontroller, a battery power supply circuit, a buck-boost bridge circuit, a heating unit resistance sampling circuit and a heating unit resistance detection module, wherein the battery power supply circuit includes a switch and a chargeable battery, the microcontroller is sequentially and electrically connected with the buck-boost bridge circuit, the heating unit resistance sampling circuit, the heating unit and the heating unit resistance detection module and then connected back to the microcontroller, the heating unit sampling circuit is connected with the resistance detection module, a feedback circuit is connected between the buck-boost bridge circuit and the heating unit, the feedback circuit is connected back to the microcontroller, the heating unit is electrically connected with a short circuit detection module, the short circuit detection module is connected with the microcontroller, the microcontroller is electrically connected with a charging circuit, the charger is electrically connected with the charging voltage detection module and then connected with the microcontroller, the charger is electrically connected with the charging circuit and the battery power supply circuit, the battery power supply circuit supplies power to the microcontroller and the buck-boost bridge circuit, the microcontroller is connected with the input end of the auxiliary boost module, the output end of the auxiliary boost module is connected with the buck-boost bridge circuit, and the microcontroller is also electrically connected with an LED control module, a switch detection module and a motor vibration control module respectively; when the electronic smoking set is used, the resistance value of the heating unit is correspondingly changed when the temperature of the heating unit is changed, the resistance value detection module of the heating unit detects the resistance value of the heating unit and converts the resistance value into a corresponding temperature electric signal to be transmitted to the microcontroller, and the microcontroller sends a control signal to the buck-boost bridge circuit after comparing the temperature electric signal with a set temperature value, so that the output voltage of the buck-boost bridge circuit is changed, and the power of the heating unit is also changed to adjust the stability of the temperature of the heating unit.
In the heating device of the electronic smoking set, the heating unit consists of the ceramic heating tube and the thermosensitive heating wire (not shown in the figure) arranged on the ceramic heating tube, and the resistance of the thermosensitive 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 heating device of the electronic smoking set of the present invention further includes an auxiliary boost module, the microcontroller is connected to an input end of the auxiliary boost module, and an output end of the auxiliary boost module is connected to the buck-boost bridge circuit. The auxiliary boost module is used for compensating or assisting the buck-boost bridge circuit so as to perform better boosting.
Referring to fig. 1, in the heating device of the electronic smoking set of the present invention, the heating unit is electrically 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 heating unit is short-circuited, if so, the microcontroller can instruct the buck-boost bridge circuit to close the output, and the electronic smoking set stops working.
Referring to fig. 1, in the heating device of the electronic smoking set of the present invention, the microcontroller is electrically connected to the charging circuit, the charger is electrically connected to the charging voltage detection module and then connected to the microcontroller, the charger is electrically connected to the charging circuit and the battery power supply circuit, and the battery power supply circuit supplies power to the microcontroller and the buck-boost bridge circuit respectively. The charging voltage detection module works during charging to prevent the charger from being overcharged.
Referring to fig. 1, the microcontroller is further electrically connected to an LED control module, a switch detection module and a motor vibration control module, where the LED control module is used to control the LED indicator to indicate different brightness or different color or combination thereof to the smoking status, the switch detection module is used to detect the closing status or closing time of the key switch, and the motor vibration control module is used to control the motor to vibrate when the motor can enter the smoking status after being started or when the motor is shut down so as to prompt the user.
Referring to fig. 2, the resistance detection module of the heating unit includes an op-amp U 4 Resistance R 16 Resistance R 17 Capacitance C 12 Resistance R 19 Capacitance C 13 Resistance R 22 Capacitance C 14 And capacitor C 15 The heating unit resistance sampling circuit comprises a resistor R 18 U is put to fortune 4 The operational amplifier U is provided with 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 4 The fourth pins IN+ of (a) are respectively connected with the capacitor C 12 And resistance R 17 The output end VOUT of the step-up and step-down circuit is connected, and the fifth pin IN-is respectively connected with the capacitor C 12 And resistance R 16 After that, the heating unit sampling circuit output end PWM-OUT and the resistor R are connected 16 Connection node and resistor R with output end PWM-OUT of heating unit sampling circuit 17 Resistor R is connected between the junction of the connecting wire and output end VOUT of the step-up and step-down circuit 18 Sixth pin OUT connection resistor R of operational amplifier U4 19 Then respectively switching in a current detection signal IDET and a capacitor C 13 Capacitance C 13 The other end is grounded, and the operational amplifier U 4 The first pin REF and the second pin GND are grounded, and the operational amplifier U 4 Third pin VCC connection resistor R of (C) 22 After accessing auxiliary boost VCC-12V, a third pin VCC and a resistor R 22 The nodes between the capacitors are respectively connected with a capacitor C 15 And capacitor C 14 Capacitance C 15 And capacitor C 14 The other end of the first electrode is grounded; when the current passes through the resistor R 18 Resistance R at the time 18 The two ends will be divided voltage and pass through resistor R 16 Resistance R 17 Capacitance C 12 Filtering once and thenInput to operational amplifier U 4 U is put to fortune 4 Amplifying the filtered voltage and passing through a resistor R 19 Capacitance C 13 Filtering and calculating the resistance value of the heating unit through the current detection signal IDET, namely the detection resistor is realized by detecting current.
Referring to FIG. 3, the buck-boost bridge circuit includes a chip U 1 Chip U 2 MOS tube Q 1 And Q 2 MOS tube Q 3 And Q 4 A first zener diode, a second zener diode, a resistor R 1 Resistance R 2 Resistance R 3 Capacitance C 1 Capacitance C 3 Capacitance C 2 Capacitance C 4 And inductance L 1 Chip U 1 The first pin VCC of (C) is connected with the capacitor C 3 Rear ground, chip U 1 Is accessed into MOS tube Q by third pin HO 2 Gate of (c), chip U 1 Is connected with MOS tube Q through LO at tenth pin 1 Gate of (c), chip U 2 The first pin VCC of (C) is connected with the capacitor C 4 Rear ground, chip U 2 Is accessed into MOS tube Q by third pin HO 3 Gate of (c), chip U 2 Is connected with MOS tube Q through LO at tenth pin 4 Gate of (c), chip U 1 Through inductance L 1 Access chip U 2 Fourth pin HS, chip U 1 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 1 Capacitance C 1 Capacitance C 1 The other end is connected with the chip U 1 Fourth pin HS of zener diode D 1 The other end is connected with the chip U 1 The first pin VCC of (C), the chip U 2 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 2 Capacitance C 2 Capacitance C 2 The other end is connected with the chip U 2 Fourth pin HS of zener diode D 2 The other end is connected with the chip U 2 The first pin VCC of (C), the chip U 1 And chip U 2 The ninth pins VSS are grounded, and the chip U 1 The eighth pin IN of the (B) is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller and a chip U 2 The eighth pin IN of the (E) is connected with the signal end PWM-DN of the voltage-reducing output frequency of the microcontroller, and the chip U 1 And coreSheet U 2 The seventh pins EN are respectively connected with an output control signal end PWM-EN of the buck-boost bridge circuit and the chip U 2 Connection node of seventh pin EN and output control signal end PWM-EN is connected with resistor R 3 Rear ground, chip U 1 The sixth pin RDT of (1) is connected with the resistor R 1 Rear ground, chip U 2 The sixth pin RDT of (1) is connected with the resistor R 2 Rear ground; when the battery voltage is lower than the output voltage, the buck-boost bridge circuit steps down the driving chip U 2 Output signal opens MOS pipe Q 3 Through inductance L 1 Connection chip U 1 MOS tube Q 1 And Q 2 Boost driving chip U 1 The micro controller outputs PWM-UP control signals to drive the MOS transistor Q 1 And Q 2 The boost output VOUT; conversely, when the battery voltage is higher than the output voltage, the boost-buck circuit boosts the driving chip U 1 Output signal opens MOS pipe Q 2 Through inductance L 1 Connection chip U 2 MOS tube Q 4 And Q 3 Step-down driving chip U 2 The micro controller outputs PWM-DN control signals to drive the MOS transistor Q 4 And Q 3 And step down the voltage output VOUT.
Referring to fig. 4, the control method of the heating device of the electronic smoking set of the present invention includes the following steps:
when an electronic smoking set starts to work, a microcontroller judges whether the switch closing time exceeds the set switch time (3 seconds), if not, the step is selected, and if so, the next step is performed;
in the step, if the switch closing time does not exceed the set switch time for 3 seconds, the switch is indicated to be touched by mistake, the lifting voltage bridge circuit does not output, the heating unit of the electronic smoking set does not work, and if the switch closing time exceeds 3 seconds, the switch closing system is indicated to be operated manually;
the step-up and step-down bridge circuit outputs a voltage signal;
in the step, a voltage signal output by the buck-boost bridge circuit, namely the heating unit starts to work;
thirdly, the microcontroller starts working timing and judges whether the set working time (3 minutes) is up to no, if yes, the step is selected, and if no, the next step is performed;
in the step, the set working time is 3 minutes, namely the total time for drawing one cigarette, and if the total time exceeds the total time, the cigarette is completely used, the cigarette can not be continuously drawn, and the heating unit needs to stop working;
the microcontroller starts to measure resistance timing and judges whether the set interval time of the resistance value of the heating unit is 3ms, if not, the timing is continued and the judgment is carried out, and if so, the next step is carried out;
in the step, the resistance measurement timing is performed because the resistance value of the heating unit needs to be measured once at intervals of 3ms, which is set in the microcontroller;
the heating unit resistance detection module detects the heating unit resistance, and the microcontroller calculates a corresponding temperature value according to the detected heating unit resistance and calculates a temperature change rate at the same time;
in the step, because the resistance of the heating unit is a thermistor, the heating temperature and the resistance value of the resistor have a corresponding relation, the corresponding temperature value can be calculated by measuring the resistance of the heating unit, and the temperature change rate can be calculated by changing the temperature within a certain time;
the method comprises the steps of sixthly, judging whether the temperature change rate is larger than or equal to a set temperature change rate value, if so, indicating that the electronic smoking set is in a smoking state, and entering the next step; if not, indicating that the electronic smoking set is in a standby state, and entering a step I;
in the step, as the temperature change rate represents the speed of temperature change, the larger the temperature change rate is, the faster the temperature change is when smoking, the slower the temperature change is when waiting, and a temperature change rate value can be set between the two to distinguish the states of the two;
comparing the temperature value with the set smoking temperature value, and if the temperature value is equal to the set smoking temperature value, entering the next step; if the temperature is smaller than the set smoking temperature value, the step I is carried out; if the temperature is larger than the set smoking temperature value, entering a step I;
in the step, the set smoking temperature value represents the smoking temperature of the heating unit to be regulated and stabilized at the set smoking temperature value during smoking;
the step-up and step-down bridge circuit is controlled by the microcontroller to maintain voltage output, and the step is returned to;
the voltage output of the buck-boost bridge circuit is increased through the microcontroller, so that the power of the heating unit is increased, the temperature is increased, and the step is returned;
the voltage output of the buck-boost bridge circuit is reduced through the microcontroller, so that the power of the heating unit is reduced, the temperature is reduced, and the step is returned;
judging whether the temperature change rate is continuously smaller than the set temperature change rate value or not, if so, entering a step B, if not, entering a next step;
in the step, the temperature change rate is continuously smaller than the set temperature change rate value, namely the temperature change is continuously slow, namely the standby is continuously carried out, and when the standby time exceeds the set standby time, the user does not smoke any more, and the electronic smoking set is required to be shut down;
comparing the temperature value with the set standby temperature value, and if the temperature value is equal to the set standby temperature value, entering the step; if the temperature is smaller than the set standby temperature value, entering step I; if the temperature is larger than the set standby temperature value, entering a step I;
in the step, in the set standby time, the standby temperature also needs to be regulated and stabilized at the set standby temperature value; the set standby temperature value is smaller than the set smoking temperature value;
and closing the voltage output of the buck-boost bridge circuit, and stopping the electronic smoking set.
The foregoing is only illustrative of the present invention and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The heating device of the electronic smoking set is characterized by comprising a microcontroller, a battery power supply circuit, a buck-boost bridge circuit, a heating unit resistance sampling circuit and a heating unit resistance detection module, wherein the battery power supply circuit comprises a switch and a chargeable battery, the microcontroller is sequentially and electrically connected with the buck-boost bridge circuit, the heating unit resistance sampling circuit, the heating unit and the heating unit resistance detection module and then connected back to the microcontroller, the heating unit resistance sampling circuit is connected with the heating unit resistance detection module, a feedback circuit is connected between the buck-boost bridge circuit and the heating unit, and is connected back to the microcontroller, when the electronic smoking set is used, the temperature of the heating unit is correspondingly changed, the heating unit resistance detection module detects the resistance of the heating unit and converts the resistance into a corresponding temperature electric signal, and the microcontroller sends a control signal to the buck-boost bridge circuit after comparing the temperature electric signal with a set temperature value, so that the output voltage of the buck-boost bridge circuit is changed, the power of the heating unit is also changed, and the temperature of the heating unit is stabilized;
the microcontroller is connected to the input end of the auxiliary boost module, and the output end of the auxiliary boost module is connected to the boost-buck bridge circuit;
the heating unit resistance detection module comprises an operational amplifier U 4 Resistance R 16 Resistance R 17 Capacitance C 12 Resistance R 19 Capacitance C 13 Resistance R 22 Capacitance C 14 And capacitor C 15 The heating unit resistance sampling circuit comprises a resistor R 18 The operational amplifier U 4 The operational amplifier U is provided with 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 4 The fourth pins IN+ of (a) are respectively connected with the capacitor C 12 And a resistor R 17 The output end VOUT of the buck-boost bridge circuit is connected at the rear, and the fifth pin IN-is respectively connected with the capacitor C 12 And the other end of (2) and the resistor R 16 Then connected into the output end PWM-OUT of the heating unit resistance sampling circuit, and the resistor R 16 Connection node and resistor R with output end PWM-OUT of heating unit resistance sampling circuit 17 Resistor R is connected between the connecting node of output end VOUT of buck-boost bridge circuit 18 U4 of operational amplifierSixth pin OUT connecting resistor R 19 Then respectively switching in a current detection signal IDET and a capacitor C 13 One end of (C) capacitor 13 The other end is grounded, and the operational amplifier U 4 The first pin REF and the second pin GND are grounded, and the operational amplifier U 4 Third pin VCC connection resistor R of (C) 22 After accessing auxiliary boost VCC-12V, a third pin VCC and a resistor R 22 The nodes between the capacitors are respectively connected with a capacitor C 15 And capacitor C 14 Capacitance C 15 And capacitor C 14 The other end of the first electrode is grounded; when the current passes through the resistor R 18 Resistance R at the time 18 The two ends will be divided voltage and pass through resistor R 16 Resistance R 17 Capacitance C 12 Filtering once and inputting to operational amplifier U 4 U is put to fortune 4 Amplifying the filtered voltage and passing through a resistor R 19 Capacitance C 13 Filtering, and calculating the resistance of the heating unit through the current detection signal IDET.
2. The heating device of the electronic smoking article of claim 1, wherein the heating unit is electrically connected to a short circuit detection module, the short circuit detection module being coupled to the microcontroller.
3. The heating device of the electronic smoking set of claim 1, wherein the microcontroller is electrically connected to the charging circuit, the charger is electrically connected to the charging voltage detection module and then connected to the microcontroller, the charger is electrically connected to the charging circuit and the battery power supply circuit, and the battery power supply circuit supplies power to the microcontroller and the buck-boost bridge circuit, respectively.
4. The heating device of the electronic smoking article of claim 1, wherein the microcontroller is further electrically connected to the LED control module, the switch detection module and the motor vibration control module, respectively.
5. The heating device of the electronic smoking set of claim 1, wherein the buck-boost bridge circuit comprises a die U 1 Chip U 2 MOS tube Q 1 And Q 2 MOS tube Q 3 And Q 4 A first zener diode, a second zener diode, a resistor R 1 Resistance R 2 Resistance R 3 Capacitance C 1 Capacitance C 3 Capacitance C 2 Capacitance C 4 And inductance L 1 The chip U 1 The first pin VCC of (C) is connected with the capacitor C 3 Rear ground, chip U 1 Is accessed into MOS tube Q by third pin HO 2 Gate of (c), chip U 1 Is connected with MOS tube Q through LO at tenth pin 1 Gate of the chip U 2 The first pin VCC of (C) is connected with the capacitor C 4 Rear ground, chip U 2 Is accessed into MOS tube Q by third pin HO 3 Gate of (c), chip U 2 Is connected with MOS tube Q through LO at tenth pin 4 Gate of (c), chip U 1 Through inductance L 1 Access chip U 2 Fourth pin HS, chip U 1 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 1 One end of (C) capacitor 1 Capacitance C 1 The other end is connected with the chip U 1 Fourth pin HS of zener diode D 1 The other end is connected with the chip U 1 The first pin VCC of (C), the chip U 2 The second pins of the voltage stabilizing diode are respectively connected with a voltage stabilizing diode D 2 One end of (C) capacitor 2 Capacitance C 2 The other end is connected with the chip U 2 Fourth pin HS of zener diode D 2 The other end is connected with the chip U 2 The first pin VCC of (C), the chip U 1 And chip U 2 The ninth pins VSS are grounded, and the chip U 1 The eighth pin IN of the (B) is connected with a signal end PWM-UP of the boosting output frequency of the microcontroller and a chip U 2 The eighth pin IN of the (E) is connected with the signal end PWM-DN of the voltage-reducing output frequency of the microcontroller, and the chip U 1 And chip U 2 The seventh pins EN are respectively connected with an output control signal end PWM-EN of the buck-boost bridge circuit and the chip U 2 Connection node of seventh pin EN and output control signal end PWM-EN is connected with resistor R 3 Rear ground, chip U 1 The sixth pin RDT of (1) is connected with the resistor R 1 Rear ground, chip U 2 The sixth pin RDT of (1) is connected with the resistor R 2 Rear ground; when the battery voltage is lower than the output voltage, the buck-boost bridge circuit steps down the driving chip U 2 Output signal opens MOS pipe Q 3 Through inductance L 1 Connection chip U 1 MOS tube Q 1 And Q 2 Boost driving chip U 1 The micro controller outputs PWM-UP control signals to drive the MOS transistor Q 1 And Q 2 The boost output VOUT; conversely, when the battery voltage is higher than the output voltage, the boost-buck circuit boosts the driving chip U 1 Output signal opens MOS pipe Q 2 Through inductance L 1 Connection chip U 2 MOS tube Q 4 And Q 3 Step-down driving chip U 2 The micro controller outputs PWM-DN control signals to drive the MOS transistor Q 4 And Q 3 And step down the voltage output VOUT.
6. A method of controlling a heating device of an electronic smoking article according to any one of claims 1-5, comprising the steps of:
when an electronic smoking set starts to work, a microcontroller judges whether the closing time of a switch exceeds the set switching time, if not, the step is selected, and if so, the next step is performed;
the step-up and step-down bridge circuit outputs a voltage signal;
thirdly, starting working timing by the microcontroller and judging whether the set working time is up, if so, entering a step, otherwise, entering a next step;
the microcontroller starts to measure resistance timing and judges whether the set interval time for measuring the resistance value of the heating unit is reached, if not, the timing is continued and judgment is carried out, and if so, the next step is carried out;
the heating unit resistance detection module detects the heating unit resistance, and the microcontroller calculates a corresponding temperature value according to the detected heating unit resistance and calculates a temperature change rate at the same time;
the method comprises the steps of sixthly, judging whether the temperature change rate is larger than or equal to a set temperature change rate value, if so, indicating that the electronic smoking set is in a smoking state, and entering the next step; if not, indicating that the electronic smoking set is in a standby state, and entering a step I;
comparing the temperature value with a set smoking temperature value, and if the temperature value is equal to the set smoking temperature value, entering the next step; if the temperature is smaller than the set smoking temperature value, the step I is carried out; if the temperature is larger than the set smoking temperature value, entering a step I;
the step-up and step-down bridge circuit is controlled by the microcontroller to maintain voltage output, and the step is returned to;
the voltage output of the buck-boost bridge circuit is increased through the microcontroller, so that the power of the heating unit is increased, the temperature is increased, and the step is returned;
the voltage output of the buck-boost bridge circuit is reduced through the microcontroller, so that the power of the heating unit is reduced, the temperature is reduced, and the step is returned;
judging whether the temperature change rate is continuously smaller than the set temperature change rate value or not, if so, entering a step B, if not, entering a next step;
comparing the temperature value with a set standby temperature value, and if the temperature value is equal to the set standby temperature value, entering a step F; if the temperature is smaller than the set standby temperature value, entering step I; if the temperature is larger than the set standby temperature value, entering a step I;
and closing the voltage output of the buck-boost bridge circuit, and stopping the electronic smoking set.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710697338.0A CN107467718B (en) | 2017-08-15 | 2017-08-15 | Heating device of electronic smoking set and control method thereof |
| PCT/CN2018/096065 WO2019033888A1 (en) | 2017-08-15 | 2018-07-18 | Heating-emitting device of electronic smoking set, and control method therefor |
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| CN201710697338.0A CN107467718B (en) | 2017-08-15 | 2017-08-15 | Heating device of electronic smoking set and control method thereof |
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| CN107467718A CN107467718A (en) | 2017-12-15 |
| CN107467718B true CN107467718B (en) | 2023-08-01 |
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