WO2022052611A1

WO2022052611A1 - Electronic atomiser with constant temperature control

Info

Publication number: WO2022052611A1
Application number: PCT/CN2021/104878
Authority: WO
Inventors: 林光榕; 郑贤彬; 张夕勇
Original assignee: 惠州市新泓威科技有限公司
Priority date: 2020-09-11
Filing date: 2021-07-07
Publication date: 2022-03-17
Also published as: CN112107035A

Abstract

An electronic atomiser with constant temperature control, comprising an atomising assembly and a battery assembly, the atomising assembly comprising a heating element (1), the battery assembly comprising a battery (2) and a control circuit, the control circuit comprising an activation switch unit (3), a microcontroller (4), a PWM voltage output control unit (5), and a temperature detection unit, a PWM signal generating unit (42) and a parameter storage unit (43) being disposed inside the microcontroller (4), the parameters stored in the parameter storage unit (43) comprising a working temperature set value, the temperature detection unit being used for detecting the real-time working temperature of the heating element (1), and the PWM signal generating unit (42) adjusting the PWM duty cycle on the basis of the difference between the real-time working temperature and the working temperature set value, producing a corresponding PWM signal, and sending same to the PWM voltage output control unit (5) to output a corresponding PWM voltage to the heating element (1) in order to stabilise the real-time working temperature at the working temperature set value; the advantages are that the working temperature of the heating element (1) can be accurately and stably controlled and, when the liquid supply to the heating element is insufficient, the voltage output is quickly cut off, preventing the electronic atomiser from dry burning.

Description

Thermostatically controlled electronic nebulizer

technical field

The present invention relates to the technical field of electronic atomizers, and more particularly, the present invention relates to a thermostatically controlled electronic atomizer.

Background technique

Electronic atomizers are used to heat and atomize e-cigarette liquid or liquid medicine into vapor or aerosol for users to smoke. Electronic atomizers generally include a heating assembly and a battery assembly. The battery assembly is used to control the heating assembly and provide power to the heating assembly. The heating assembly includes a heating element, and the heating element can heat the liquid to be atomized to generate vapor mist or aerosol for the user to inhale. The liquid to be nebulized includes e-cigarette liquid or liquid medicine in which the drug is dissolved.

For most of the existing electronic atomizers, when the user takes a puff, after turning on the start switch, the heating element generally heats the atomization in the form of constant power or constant voltage output, the working temperature of the heating element continues to rise, and the generated vapor mist Or the aerosol is uneven and unstable. In addition, when the electronic atomizer lacks the liquid to be atomized or the liquid supply is insufficient, the working temperature of the heating element rises sharply, resulting in dry burning, and the inside of the atomization unit is prone to burnt smell, Smell, causing a bad user experience.

technical problem

The purpose of the present invention is to provide a thermostatically controlled electronic atomizer in order to overcome the deficiencies of the above technologies.

technical solutions

The technical solution of the present invention is achieved as follows: a thermostatically controlled electronic atomizer, including an atomization assembly and a battery assembly, the atomization assembly includes a heating element for heating the liquid to be atomized, and the battery assembly includes A battery and a control circuit, the control circuit includes a start switch unit, a microcontroller, a PWM voltage output control unit electrically connected to the microcontroller, and a temperature detection unit, and the microcontroller is provided with a PWM signal generation unit and a parameter storage unit unit, the parameters stored in the parameter storage unit include a working temperature set value, the temperature detection unit is used to detect the real-time working temperature of the heating element, and the PWM signal generating unit is based on the difference between the real-time working temperature and the working temperature set value. The value adjusts the PWM duty cycle, generates a corresponding PWM signal and sends it to the PWM voltage output control unit, and the PWM voltage output control unit outputs the corresponding PWM voltage to the heating element in order to stabilize the real-time operating temperature at the operating temperature. temperature setpoint.

Preferably, the parameters stored in the parameter storage unit further include a constant power setting value, a difference setting value between the real-time working temperature and the working temperature setting value, and the PWM signal generating unit is configured to, when the real-time working temperature is different from the working temperature When the difference between the temperature setting values is greater than the difference setting value, the PWM signal generating unit generates a corresponding PWM signal according to the constant power setting value to the PWM voltage output control unit, so that the real-time working temperature can quickly reach the Operating temperature setpoint.

Preferably, the parameters stored in the parameter storage unit further include a PWM duty cycle setting value and a set number of times lower than the PWM duty cycle setting value, and the PWM voltage output control unit is configured to, when the PWM signal When the PWM duty cycle is continuously lower than the set value of the PWM duty cycle for a set number of times, the PWM voltage output control unit turns off the voltage output.

Preferably, the microcontroller includes a chip MCU and a connection circuit thereof, the chip MCU includes 24 pins, wherein the first pin is connected to the first reference resistor voltage detection signal terminal RES-DET1, and the second pin is connected to the first reference resistor voltage detection signal terminal RES-DET1. Two reference resistor voltage detection signal terminals RES-DET2, the seventh pin is grounded, the ninth pin is connected to one end of the resistor R1, capacitor C1 and capacitor C2 at the same time, the other end of the resistor R1 is connected to the positive electrode BAT+ of the battery, the capacitor The other ends of C1 and capacitor C2 are grounded at the same time, the 13th pin is connected to the blue indicator signal terminal RGB-B, the 14th pin is connected to the green indicator signal terminal RGB-G, and the 15th pin is connected to the red indicator signal terminal RGB -R, the 17th pin is connected to the microphone signal terminal Mic, the 18th pin is connected to the resistance detection enable signal terminal Res-DET-EN, and the 24th pin is connected to the chopper output control signal terminal PWM.

Preferably, the PWM voltage output control unit includes a MOS transistor Q3 and a triode Q2B, the S pole of the MOS transistor Q3 is connected to the positive electrode BAT+ of the battery, the D pole is used as the output voltage signal terminal PWM-OUT, and the G pole is connected to one end of the resistor R12 , the other end of the resistor R12 is connected to one end of the resistor R11 and the C pole of the transistor Q2B at the same time, the other end of the resistor R11 is connected to the positive electrode BAT+ of the battery, the B pole of the transistor Q2B is connected to one end of the resistor R13, and the E pole is simultaneously Ground and connect one end of the resistor R14, the other end of the resistor R13 and the other end of the resistor R14 are connected to the chopper output control signal end PWM at the same time.

Preferably, the resistance detection unit includes a MOS transistor Q1 and a triode Q2A, the S pole of the MOS transistor Q1 is connected to the positive electrode BAT+ of the battery, the D pole is connected to one end of the resistors R5 and R7 at the same time, and the G pole is connected to one end of the resistor R2 at the same time and the C pole of the transistor Q2A, the other end of the resistor R2 is connected to the positive electrode BAT+ of the battery, the B pole of the transistor Q2A is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the resistance detection enable signal terminal Res-DET-EN, the E pole of the transistor Q2A is grounded, the other end of the resistor R5 is connected to the first reference resistor voltage detection signal terminal RES-DET1, one end of the resistor R6, and one end of the capacitor C4 at the same time, the resistor R7 At the same time, connect the output voltage signal terminal PWM-OUT and one end of the resistor R8, and the other end of the resistor R8 is connected to the second reference resistor voltage detection signal terminal RES-DET2, one end of the resistor R9, and one end of the capacitor C5. The resistor R6 , The other ends of the resistor R9, the capacitor C4, and the capacitor C5 are grounded at the same time.

Preferably, the startup switch unit includes a microphone head MIC, and the microphone head MIC includes 3 pins, wherein the first pin is connected to one end of the resistor R15 and one end of the capacitor C6 at the same time, and the other end of the resistor R15 is connected to the battery The positive electrode BAT+, the second pin and the other end of the capacitor C6 are grounded at the same time, and the third pin is connected to the microphone signal terminal Mic.

beneficial effect

The thermostatically controlled electronic atomizer of the present invention can accurately and stably control the working temperature of the heating element, so that the electronic atomizer can quickly generate uniform, stable and constant temperature vapor or aerosol, and at the same time, when the liquid supply of the heating element is insufficient Quickly turn off the voltage output to prevent the electronic atomizer from drying out and improve the user experience.

Description of drawings

Fig. 1 is the structural block diagram of the electronic atomizer control circuit of the present invention;

Fig. 2 is the circuit diagram of the microcontroller of the present invention;

Fig. 3 is the circuit diagram of the PWM voltage output control unit of the present invention;

Fig. 4 is the circuit diagram of the resistance value detection unit of the present invention;

Fig. 5 is the circuit diagram of the starting switch unit of the present invention;

Fig. 6 is the change curve diagram of the PWM duty ratio when the electronic atomizer of the present invention works;

Fig. 7 is the heating temperature change curve diagram when the electronic atomizer of the present invention works.

Best Mode for Carrying Out the Invention

Example:

The thermostatically controlled electronic atomizer according to the embodiment of the present invention is used to heat the liquid to be atomized so as to generate atomized vapor or aerosol for the user to inhale.

As shown in FIG. 1 , the electronic atomizer of this embodiment includes a heating component and a battery component. The heating component is provided with a heating element 1 for heating the liquid to be atomized. The heating element 1 is a thermistor with a positive temperature coefficient, and the battery The component is provided with a battery 2 and a control circuit. The control circuit includes a start switch unit 3, a microcontroller 4, a PWM voltage output control unit 5 electrically connected to the microcontroller 4, and a temperature detection unit (not shown in the figure). This embodiment The temperature detection unit includes a resistance value detection unit 6 and a temperature conversion unit 41 provided in the microcontroller 4 . The microcontroller 4 is also provided with a PWM signal generation unit 42, a parameter storage unit 43, and a computer program is preset for automatic control, the PWM signal generation unit 42 outputs a PWM signal to the PWM voltage output control unit 5, and the PWM voltage output control unit 5. According to this, the PWM voltage is output to the heating element 1. The resistance value detection unit 6 is used to detect the resistance value of the heating element 1. The temperature conversion unit 41 converts the detected resistance value into a real-time working temperature. The parameters stored in the parameter storage unit 43 include the set value of the working temperature, the temperature detection unit is used to detect the real-time working temperature of the heating element, and the PWM signal generation unit 42 adjusts the PWM duty cycle according to the difference between the real-time working temperature and the set value of the working temperature. , generate the corresponding PWM signal and send it to the PWM voltage output control unit 5, and the PWM voltage output control unit 5 outputs the corresponding PWM voltage to the heating element 1 for constant temperature control, that is, the real-time working temperature is stabilized at the working temperature set value.

The parameters stored in the parameter storage unit 43 also include the constant power setting value, the difference setting value between the real-time working temperature and the working temperature setting value, and the PWM signal generating unit 42 is configured to, when the real-time working temperature and the working temperature setting value are different When the difference is greater than the set value of the difference, the PWM signal generating unit 42 generates a corresponding PWM signal to the PWM voltage output control unit 5 according to the set value of the constant power, so as to quickly bring the real-time working temperature to the set value of the working temperature.

The parameters stored in the parameter storage unit 43 also include the set value of the PWM duty cycle and the set times lower than the set value of the PWM duty cycle. The PWM voltage output control unit 5 is configured so that when the PWM duty cycle of the PWM signal is continuously low When the set value of the PWM duty cycle reaches the set number of times, the PWM voltage output control unit 5 turns off the voltage output.

As shown in FIG. 2 , the microcontroller 4 of this embodiment includes a chip MCU and its connection circuit. The chip MCU includes 24 pins, wherein the first pin is connected to the first reference resistor voltage detection signal terminal RES-DET1, and the second The pin is connected to the second reference resistor voltage detection signal terminal RES-DET2, the seventh pin is grounded, the ninth pin is connected to one end of the resistor R1, capacitor C1 and capacitor C2 at the same time, the other end of the resistor R1 is connected to the positive electrode of the battery BAT+, and the capacitor The other ends of C1 and capacitor C2 are grounded at the same time, the 13th pin is connected to the blue indicator signal terminal RGB-B, the 14th pin is connected to the green indicator signal terminal RGB-G, and the 15th pin is connected to the red indicator signal terminal RGB -R, the 17th pin is connected to the microphone signal terminal Mic, the 18th pin is connected to the resistance detection enable signal terminal Res-DET-EN, and the 24th pin is connected to the chopper output control signal terminal PWM.

As shown in FIG. 3 , the PWM voltage output control unit of this embodiment includes a MOS transistor Q3 and a triode Q2B, the S pole of the MOS transistor Q3 is connected to the positive electrode BAT+ of the battery, the D pole is used as the output voltage signal terminal PWM-OUT, and the G pole is connected to the resistor One end of R12, the other end of the resistor R12 is connected to one end of the resistor R11 and the C pole of the transistor Q2B at the same time, the other end of the resistor R11 is connected to the positive electrode BAT+ of the battery, the B pole of the transistor Q2B is connected to one end of the resistor R13, and the E pole is grounded and connected at the same time One end of the resistor R14, the other end of the resistor R13 and the other end of the resistor R14 are connected to the chopper output control signal end PWM at the same time.

As shown in FIG. 4 , the resistance detection unit of this embodiment includes a MOS transistor Q1 and a triode Q2A. The S pole of the MOS transistor Q1 is connected to the positive electrode BAT+ of the battery, the D pole is connected to one end of the resistors R5 and R7 at the same time, and the G pole is connected to the resistor at the same time. One end of R2 is connected to the C pole of the transistor Q2A, the other end of the resistor R2 is connected to the positive electrode BAT+ of the battery, the B pole of the transistor Q2A is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the resistance detection enable signal terminal Res-DET-EN , the E pole of the transistor Q2A is grounded, the other end of the resistor R5 is connected to the first reference resistor voltage detection signal terminal RES-DET1, one end of the resistor R6, and one end of the capacitor C4 at the same time, and the resistor R7 is connected to the output voltage signal terminal PWM-OUT and the resistor at the same time One end of R8 and the other end of resistor R8 are simultaneously connected to the second reference resistor voltage detection signal terminal RES-DET2, one end of resistor R9 and one end of capacitor C5, and the other ends of resistor R6, resistor R9, capacitor C4 and capacitor C5 are grounded at the same time.

As shown in FIG. 5 , the startup switch unit of this embodiment includes a microphone head MIC, and the microphone head MIC includes three pins, wherein the first pin is connected to one end of the resistor R15 and one end of the capacitor C6 at the same time, and the other end of the resistor R15 is connected to The positive electrode of the battery is BAT+, the second pin and the other end of the capacitor C6 are grounded at the same time, and the third pin is connected to the microphone signal terminal Mic.

As shown in Figure 6 and Figure 7, the working principle of the electronic atomizer controlled by the constant temperature of the present embodiment is as follows:

When the electronic atomizer is sucked, the start switch 3 senses the sucked airflow and turns on the control circuit, so that the PWM voltage output control unit 5 outputs a voltage to the heating element 1, and the heating element 1 starts to work. At this time, the temperature of the heating element 1 is relatively low. In order to atomize the liquid to be atomized as soon as possible, the user can inhale the vapor or aerosol, so that the heating element of the electronic atomizer can be rapidly heated from the initial temperature T0 to the working temperature. The set value T1 is the stage t1 in FIG. 6 and FIG. 7 . In the t1 stage, the heating element 1 is heated by means of high power and constant power output. According to the power calculation formula P=U²/R, in order to obtain a large constant power P, a high stable voltage U needs to be output at this time, and The battery voltage of the electronic atomizer is relatively fixed. In this embodiment, the PWM signal generation unit 42 is adjusted to a higher PWM duty cycle to perform PWM modulation output on the battery voltage (as shown in FIG. curve), the PWM voltage output control unit 5 outputs a higher PWM voltage to the heating element 1 accordingly, so the heating element 1 can quickly heat up to the set value of the working temperature (the temperature rise curve in the t1 stage in Figure 7).

When the real-time operating temperature reaches the operating temperature set value T1, the PWM duty cycle is immediately reduced by the PWM signal generating unit 42 to reduce the output voltage, that is, as shown in FIG. At the beginning of the t2 stage, reduce the output power to the heating element 1 to prevent the real-time working temperature from continuing to rise sharply, and then compare the real-time working temperature with the working temperature set value T1, and maintain the working temperature of the heating element 1 at the working temperature set value. T1, that is, the curve in which the temperature is maintained constant in the t2 period in Fig. 7 .

When a special situation occurs, that is, when the heating element 1 lacks the liquid to be atomized or the liquid supply is insufficient, the heating element 1 is about to dry-burn, causing its working temperature to rise rapidly. At this time, in order to avoid its working temperature Rapidly rising, the output power needs to be quickly reduced. According to the power calculation formula P=U²/R, that is, the output voltage U of the PWM voltage output control unit 5 needs to be quickly reduced, and the output voltage U is passed through the PWM signal generation unit 42. The duty of PWM Therefore, it is necessary to continuously reduce the duty cycle of the PWM, as shown in the t3 phase curve shown in Figure 6. When the PWM duty cycle is lower than the set duty cycle, it indicates that the output power has dropped to a very low level and cannot continue to prevent the continued upward trend of the operating temperature, and the dry-burning state has occurred, so continue to reduce the PWM duty cycle, It is no longer necessary to continue to reduce the output power. At this time, the output voltage of the electronic atomizer is turned off to prevent the further occurrence of dry burning. In order to avoid the misjudgment caused by an occasional drop in the duty cycle, it is necessary to detect that the duty cycle of the PWM is continuously lower than the set duty cycle for the set number of times before turning off the output voltage of the electronic atomizer.

Industrial Applicability

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

A thermostatically controlled electronic atomizer, characterized in that it includes an atomization assembly and a battery assembly, the atomization assembly includes a heating element for heating the liquid to be atomized, the battery assembly includes a battery and a control circuit, and the The control circuit includes a start switch unit, a microcontroller, a PWM voltage output control unit electrically connected to the microcontroller, and a temperature detection unit. The microcontroller is provided with a PWM signal generation unit and a parameter storage unit. The parameters stored in the unit include the set value of the working temperature, the temperature detection unit is used to detect the real-time working temperature of the heating element, and the PWM signal generation unit adjusts the PWM duty cycle according to the difference between the real-time working temperature and the set value of the working temperature , generate a corresponding PWM signal and send it to the PWM voltage output control unit, and the PWM voltage output control unit outputs a corresponding PWM voltage to the heating element to stabilize the real-time working temperature at the set value of the working temperature.
The thermostatically controlled electronic atomizer according to claim 1, wherein the parameters stored in the parameter storage unit further include a constant power setting value, a difference setting value between the real-time working temperature and the working temperature setting value , the PWM signal generating unit is configured to, when the difference between the real-time working temperature and the working temperature set value is greater than the set value, the PWM signal generating unit generates a corresponding PWM signal according to the constant power set value to the PWM A voltage output control unit, so that the real-time working temperature can quickly reach the set value of the working temperature.
The thermostatically controlled electronic atomizer according to claim 1, wherein the parameters stored in the parameter storage unit further include a PWM duty cycle setting value and a set number of times lower than the PWM duty cycle setting value , the PWM voltage output control unit is configured to turn off the voltage output when the PWM duty cycle of the PWM signal is continuously lower than the PWM duty cycle set value for a set number of times.
The thermostatically controlled electronic atomizer according to claim 1, wherein the microcontroller comprises a chip MCU and a connecting circuit thereof, the chip MCU comprises 24 pins, wherein the first pin is connected to the first pin The reference resistor voltage detection signal terminal RES-DET1, the second pin is connected to the second reference resistor voltage detection signal terminal RES-DET2, the seventh pin is grounded, and the ninth pin is connected to one end of the resistor R1, capacitor C1 and capacitor C2 at the same time, The other end of the resistor R1 is connected to the positive electrode BAT+ of the battery, the other ends of the capacitor C1 and the capacitor C2 are grounded at the same time, the 13th pin is connected to the blue indicator signal terminal RGB-B, and the 14th pin is connected to the green indicator signal Terminal RGB-G, the 15th pin is connected to the red indicator signal terminal RGB-R, the 17th pin is connected to the microphone signal terminal Mic, the 18th pin is connected to the resistance detection enable signal terminal Res-DET-EN, the 24th pin The pin is connected to the chopper output control signal terminal PWM.
The thermostatically controlled electronic atomizer according to claim 1, wherein the PWM voltage output control unit comprises a MOS transistor Q3 and a triode Q2B, the S pole of the MOS transistor Q3 is connected to the battery positive electrode BAT+, and the D pole As the output voltage signal terminal PWM-OUT, the G pole is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the resistor R11 and the C pole of the transistor Q2B at the same time, and the other end of the resistor R11 is connected to the battery positive electrode BAT+, The B pole of the transistor Q2B is connected to one end of the resistor R13, the E pole is simultaneously grounded and connected to one end of the resistor R14, and the other end of the resistor R13 and the other end of the resistor R14 are connected to the chopper output control signal terminal PWM at the same time.
The thermostatically controlled electronic atomizer according to claim 1, wherein the resistance detection unit comprises a MOS transistor Q1 and a triode Q2A, the S pole of the MOS transistor Q1 is connected to the positive electrode BAT+ of the battery, and the D pole simultaneously Connect one end of the resistors R5 and R7, the G pole is connected to one end of the resistor R2 and the C pole of the transistor Q2A at the same time, the other end of the resistor R2 is connected to the positive electrode BAT+ of the battery, and the B pole of the transistor Q2A is connected to one end of the resistor R3 , the other end of the resistor R3 is connected to the resistance detection enable signal terminal Res-DET-EN, the E pole of the transistor Q2A is grounded, and the other end of the resistor R5 is connected to the first reference resistor voltage detection signal terminal RES- DET1 and one end of the resistor R6 and one end of the capacitor C4, the resistor R7 is connected to the output voltage signal terminal PWM-OUT and one end of the resistor R8 at the same time, and the other end of the resistor R8 is connected to the second reference resistor voltage detection signal terminal RES- DET2, one end of the resistor R9, one end of the capacitor C5, and the other ends of the resistor R6, the resistor R9, the capacitor C4, and the capacitor C5 are grounded at the same time.
The thermostatically controlled electronic atomizer according to claim 1, wherein the start switch unit comprises a microphone head MIC, and the microphone head MIC comprises 3 pins, wherein the first pin is connected to the resistor R15 at the same time. One end and one end of the capacitor C6, the other end of the resistor R15 is connected to the positive electrode BAT+ of the battery, the second pin and the other end of the capacitor C6 are grounded at the same time, and the third pin is connected to the microphone signal terminal Mic.