WO2020134428A1 - 恒功率防干烧电子烟及其控制方法 - Google Patents

恒功率防干烧电子烟及其控制方法 Download PDF

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Publication number
WO2020134428A1
WO2020134428A1 PCT/CN2019/112894 CN2019112894W WO2020134428A1 WO 2020134428 A1 WO2020134428 A1 WO 2020134428A1 CN 2019112894 W CN2019112894 W CN 2019112894W WO 2020134428 A1 WO2020134428 A1 WO 2020134428A1
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WO
WIPO (PCT)
Prior art keywords
pin
battery
resistance
control chip
constant power
Prior art date
Application number
PCT/CN2019/112894
Other languages
English (en)
French (fr)
Inventor
林光榕
郑贤彬
张夕勇
Original Assignee
惠州市新泓威科技有限公司
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Filing date
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Application filed by 惠州市新泓威科技有限公司 filed Critical 惠州市新泓威科技有限公司
Priority to PL19901863.1T priority Critical patent/PL3878295T3/pl
Priority to CA3122132A priority patent/CA3122132A1/en
Priority to EP19901863.1A priority patent/EP3878295B1/en
Priority to US17/311,998 priority patent/US11937649B2/en
Publication of WO2020134428A1 publication Critical patent/WO2020134428A1/zh

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Classifications

    • 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
    • A24F40/57—Temperature control
    • 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
    • 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
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • 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
    • 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
    • A24F40/60—Devices with integrated user interfaces
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0244—Heating of fluids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to the technical field of electronic cigarettes, and more specifically, the present invention relates to a constant-power dry-burn-proof electronic cigarette and a control method of the constant-power dry-burn-proof electronic cigarette.
  • E-cigarettes usually emit liquid smoke through the atomization of the atomizer for smokers to use.
  • people are aware of the harmful effects of tobacco on people's health, and e-cigarettes do not contain Tobacco tar and smoke liquid are less harmful to the human body after being atomized, so electronic cigarettes have gradually been widely used instead of cigarettes.
  • the voltage of the battery is also continuously reduced.
  • the amount of smoke will continue to decrease.
  • the increase in the resistance of the heating resistor will cause the operating voltage to drop and cause the power to decrease, so that the amount of smoke during smoking is getting smaller and smaller, which brings a bad smoking experience to the user.
  • the purpose of the present invention is to provide a constant power anti-dry burning electronic cigarette in order to overcome the deficiencies of the above technology.
  • the constant power anti-dry burning electronic cigarette can realize the monitoring of the heating resistance temperature and the function of anti-dry burning protection for the electronic cigarette At the same time, the power level can be maintained and the amount of smoke can be maintained.
  • a constant-power dry-burn-proof electronic cigarette including an atomizing rod and a battery rod, an atomizer is provided in the atomizing rod, and the atomizer includes The heating resistance of the atomized e-cigarette smoke liquid.
  • the battery rod is equipped with a battery, a circuit control board and an unlock key switch.
  • the atomizing rod or the battery rod is also provided with a smoking switch.
  • the resistance of the heating resistor is variable Variable resistance with positive temperature coefficient and temperature change
  • the circuit control board includes a micro control chip, resistance detection unit, constant power output control unit, output feedback unit, the unlock key switch, smoking switch and micro control
  • the chip is electrically connected
  • the resistance value detecting unit is electrically connected to the heating resistor for detecting its resistance value and feeding back the resistance value signal to the micro control chip
  • the output feedback unit is electrically connected to the heating resistor for detecting its working voltage and feeding back
  • the constant power output control unit is electrically connected to the micro control chip to receive the PWM control signal of the micro control chip
  • the constant power output control unit generates a corresponding PWM voltage value according to the PWM control signal and outputs it to the heating resistor
  • the PWM voltage value of the heating resistor changes synchronously with the resistance of the heating resistor to maintain the same power so that the amount of atomization generated by the heating resistor heating the smoke liquid is the same
  • the micro-control chip sets the resistance signal and the dry setting value For comparison
  • the circuit control board is further provided with a battery charging unit, a battery protection unit, a battery power supply unit, and a battery detection unit that are electrically connected to the battery, and the micro control chip is respectively connected to the battery charging unit and battery protection The unit and battery detection unit are electrically connected.
  • the atomizing rod or the battery rod is provided with a display unit electrically connected to the micro control chip.
  • the micro control chip includes 20 pins, wherein the first pin is connected to the resistance detection The unit's resistance detection signal output terminal, the third pin is connected to the ground terminal, the fifth pin is connected to the battery power supply terminal, the eighth pin is connected to the control signal terminal of the resistance detection unit, and the thirteenth pin is connected to the constant The PWM control signal input terminal of the power control unit, the 15th pin is electrically connected to the unlock key switch signal terminal, the 17th pin is connected to the auxiliary resistance value detection signal terminal of the resistance detection unit, and the 19th pin is connected to The reference voltage terminal is connected, and the 20th pin is connected to the signal terminal of the smoking switch.
  • the constant power output control unit and the resistance detection unit are connected to each other, and the resistance detection unit includes a first MOS tube having eight pins, and the third pin of the first MOS tube is The gate, pins 4 and 5 are connected to each other as a source, pins 1, 2, 6, 7 and 8 are connected to each other as a drain, and the third pin of the first MOS tube is a control signal input terminal,
  • the source of the first MOS tube is connected to the third pin through a resistor R 1
  • the resistance detection unit further includes resistors R 5 , R 3 , R 11 , R 24 and capacitors C 1 and C 2 .
  • said constant power output control unit It includes a second MOS tube with eight pins, the third pin of the second MOS tube is the gate, the fourth and fifth pins are connected to each other as the source, and the first, second, sixth, seventh and eighth leads The pins are all drains and are connected to each other as a PWM voltage output terminal.
  • the third pin of the second MOS tube is the control signal input terminal of the constant power control unit, and the fourth and fifth of the second MOS tube
  • the pin is connected to the positive electrode of the battery, and a resistor R 7 is connected in series between the third pin of the second MOS tube and the fourth and fifth pins; the fourth and fifth pins of the first MOS tube are simultaneously connected to the first
  • the fourth and fifth pins of the two MOS transistors are connected, and the connection point between the resistors R 5 and R 3 is connected to the PWM voltage output terminal.
  • one end of the unlock key switch is grounded, and the other end is an output signal terminal of the unlock key switch, and the signal terminal is connected in series with the battery positive electrode R21 at the same time.
  • the smoking switch includes 3 pins, wherein the first pin is the output signal terminal MIC of the smoking switch, the second pin is the ground terminal, and a series resistance R 27 is connected between the third pin and the positive electrode of the battery.
  • the 3 pin is connected to the capacitor C 10 in series and then grounded.
  • Another technical solution of the present invention is a method for controlling a constant-power dry-burn-proof electronic cigarette.
  • the method includes the following steps:
  • the micro control chip judges whether it is in the power-on state, if not, it goes to the next step, and if it is, it goes to step (4);
  • step 10 The micro control chip judges whether the smoking switch is turned on, if it is, then it goes to the next step, if not, it goes to step (10);
  • the resistance value detection unit detects the resistance value of the heating wire and transmits the resistance value signal to the micro control chip;
  • the micro-control chip controls the constant power output control unit to output preset power to the heating resistor
  • the micro-control chip judges whether the resistance value of the heating resistor is increased, if it is, then it goes to the next step, if not, it goes to step (4);
  • the resistance value detection unit detects whether the resistance value is greater than the dry-burning preset value. If it is, the constant power output control unit stops the output and flashes a red light 5 times to proceed to step (12). If not, it proceeds to the next step;
  • the constant power output control unit adjusts the PWM output voltage according to the power preset value to maintain constant power output
  • the micro control chip judges whether the standby time exceeds the preset value, if it is, then it goes to the next step, if not, it returns to step (4);
  • the invention detects the rise of the resistance value of the heating resistance through the resistance value detection unit, and through the action of the micro-control chip, the constant power output unit outputs the PWM voltage value to the heating resistance, and the PWM voltage value changes synchronously with the resistance value of the heating resistance to maintain With the same power, the amount of atomization produced by the heating resistance heating smoke liquid is the same. Therefore, the present invention can achieve good anti-dry burning of the electronic cigarette while keeping the smoke amount unchanged.
  • 1 is a cross-sectional view of the constant power anti-dry burning electronic cigarette of the present invention
  • FIG. 3 is a schematic diagram of the connection of the micro control chip of the present invention.
  • FIG. 4 is a circuit schematic diagram of a constant power output control unit and a resistance detection unit of the present invention
  • FIG. 5 is a schematic diagram of the circuit of the present invention to unlock the key switch
  • FIG. 6 is a circuit schematic diagram of the smoking switch of the present invention.
  • a constant-power dry-burning-proof electronic cigarette of the present invention includes an atomizing rod 1 and a battery rod 2.
  • the atomizing rod 1 is provided with an atomizer 3, and the atomizer 3 includes The heating resistance of the atomized e-cigarette liquid (not shown in the figure), the battery rod 2 is equipped with a battery 4 and a circuit control board 5, the heating resistance is a variable resistor whose resistance value can change with temperature and has a positive temperature coefficient, the battery rod 2 is provided with an unlock key switch 6, when the user smokes, he first needs to press the unlock key switch 6 to perform the unlock operation.
  • a smoking switch 7 is provided in the battery rod 2 (which may also be provided in the atomizing rod 1).
  • the smoking switch 7 may be an airflow sensing switch, and the airflow generated when the user smokes can be touched to open the switch.
  • the circuit control board 5 is provided with components including a micro control chip MCU, a resistance value detection unit, a constant power output control unit, an output feedback unit, an unlock key switch, a smoking switch and a micro control chip MCU.
  • the resistance detection unit is electrically connected to the heating resistor to detect its resistance value and feedback the resistance signal to the micro control chip
  • the output feedback unit is electrically connected to the heating resistor to detect its working voltage and feed back to the micro control chip
  • constant The power output control unit is electrically connected to the micro control chip to receive the PWM control signal of the micro control chip.
  • the constant power output control unit generates a corresponding PWM voltage value according to the PWM control signal and outputs it to the heating resistor.
  • the PWM voltage value of the heating resistor varies with the heating resistor
  • the resistance value changes synchronously to maintain the same power so that the amount of mist generated by the heating resistor heating the smoke liquid is the same, that is, according to the size of the PWM control signal, a PWM voltage with a different duty ratio is generated and output to the heating resistor, the resistance of the heating resistor
  • the higher the PWM voltage the higher the average voltage value within a certain period of time in order to keep the heating resistance at the same power so that the amount of mist generated by the heating of the smoke liquid is the same.
  • the micro control chip compares the resistance value signal with the dry burning setting value, and when the resistance value signal exceeds the dry burning setting value, the micro control chip cuts off the output of the atomizer output control unit to prevent the electronic cigarette The temperature is too high to produce dry burning.
  • FIG. 7 shows the situation where the PWM voltage value V changes with the time axis T.
  • the circuit control board 5 is further provided with a battery charging unit, a battery protection unit, a battery power supply unit, and a battery detection unit that are electrically connected to the battery.
  • the micro control chip includes 20 pins, wherein the first pin is connected to the resistance detection signal output terminal R-DET of the resistance detection unit, and the third pin is connected to the ground terminal GND,
  • the fifth pin is connected to the battery power supply terminal VDD
  • the eighth pin is connected to the control signal terminal R-DET-EN of the resistance detection unit
  • the thirteenth pin is connected to the PWM control signal input terminal PWM- of the constant power control unit EN
  • pin 15 is electrically connected to the unlock key switch signal terminal KEY-OUT
  • pin 17 is connected to the auxiliary resistance detection signal terminal I-DET of the resistance detection unit
  • pin 19 is connected to the reference voltage Terminal
  • the 20th pin is connected to the signal terminal of the smoking switch.
  • the constant power output control unit and the resistance detection unit are connected to each other, and the resistance detection unit includes a first MOS transistor Q 1 having eight pins, and the first MOS transistor Q
  • the third pin of 1 is the gate G
  • the fourth and fifth pins are connected to each other as the source S
  • the first, 2, 6, 7, 8 pins are connected to each other as the drain D
  • the The third pin is the control signal input terminal R-DET-EN.
  • the source S of the first MOS tube is connected to the third pin through a resistor R1.
  • the resistance detection unit further includes resistors R 5 and R 3 .
  • the drain D of the first MOS tube is connected in series with the resistors R 11 and R 24 and then grounded.
  • the capacitor C 1 is connected in parallel across the resistor R 24.
  • the resistors R 11 and R 24 The connection point is the resistance detection signal output terminal R-DET, the drain D of the first MOS tube is also connected in series with the resistors R 5 , R 3 , and the capacitor C 2 , and the resistor R 3 is connected to the capacitor the connection point C 2 of the auxiliary resistance detection signal terminal I-DET; said control unit comprises a constant power output of eight pins having a second MOS transistor Q 2, the second MOS transistor Q 2, pin 3 It is the gate G.
  • the pins 4 and 5 are connected to each other as the source S.
  • the pins 1, 2, 6, 7, and 8 are all the drain D and are connected to each other as the PWM voltage output terminal PWM-OUT.
  • the third pin of the second MOS tube is the control signal input terminal PWM-EN of the constant power control unit, the fourth and fifth pins of the second MOS tube are connected to the positive electrode of the battery, and the A series resistor R 7 is connected between the third pin and the fourth and fifth pins; the fourth and fifth pins of the first MOS tube are connected to the fourth and fifth pins of the second MOS tube at the same time, the The connection point between the resistors R 5 and R 3 is connected to the PWM voltage output terminal PWM-OUT.
  • the upper half of the dotted line in Figure 4 is the constant power output control unit, and the lower half of the dotted line is the resistance detection unit.
  • one end of the unlock key switch 6 is grounded, and the other end is an output signal terminal KEY-OUT of the unlock key switch, and the signal terminal KEY-OUT is connected in series with the battery positive electrode R 21 at the same time.
  • the smoking switch 7 includes three pins, wherein the pin R is the output signal terminal MIC of the smoking switch, the pin GND is the ground terminal, and a series resistance R 27 is connected between the pin VIN and the positive electrode of the battery. Pin VIN is also connected in series with capacitor C10 and then grounded.
  • a method for controlling a constant-power dry-burning-proof electronic cigarette includes the following steps:
  • the micro control chip judges whether it is in the power-on state, if not, it goes to the next step, and if it is, it goes to step (4);
  • step 10 The micro control chip judges whether the smoking switch is turned on, if it is, then it goes to the next step, if not, it goes to step (10);
  • the resistance value detection unit detects the resistance value of the heating wire and transmits the resistance value signal to the micro control chip;
  • the micro-control chip controls the constant power output control unit to output preset power to the heating resistor
  • the micro-control chip judges whether the resistance value of the heating resistor is increased, if it is, then it goes to the next step, if not, it goes to step (4);
  • the resistance value detection unit detects whether the resistance value is greater than the dry-burning preset value. If it is, the constant power output control unit stops the output and flashes a red light 5 times to proceed to step (12). If not, it proceeds to the next step;
  • the constant power output control unit adjusts the PWM output voltage according to the power preset value to maintain constant power output
  • the micro control chip judges whether the standby time exceeds the set value, if it is, then it goes to the next step, if not, it returns to step (4);

Abstract

一种恒功率防干烧电子烟及其控制方法，该电子烟包括雾化杆（1）和电池杆（2），雾化杆（1）内设有发热电阻，电池杆内装有电池（4）、电路控制板（5）和解锁按键开关（6）、吸烟开关，发热电阻为阻值可随温度变化并具有正温度系数的可变电阻，电路控制板（5）上包括有微控制芯片、阻值检测单元、恒功率输出控制单元、输出反馈单元，解锁按键开关、吸烟开关与微控制芯片电连接，在恒功率输出控制单元的调节下，发热电阻的PWM电压值随发热电阻的阻值同步变化，以保持相同的功率，从而使发热电阻加热烟液产生的雾化量相同。该电子烟及其控制方法可实现对发热电阻阻值的监控，在实现防干烧保护功能的同时还可保持功率大小不变，从而使烟雾量保持不变。

Description

恒功率防干烧电子烟及其控制方法 技术领域
本发明涉及电子烟技术领域，更具体的说，本发明涉及一种恒功率防干烧电子烟以及该恒功率防干烧电子烟的控制方法。
 背景技术
电子烟通常是将烟液经过雾化器的加热雾化而发出烟雾供吸烟者使用，随着人们对身体健康的关注度上升，人们都意识到了烟草对于人们身体的危害，而电子烟不含有烟焦油，烟液雾化后对人体产生的危害较小，故电子烟逐渐代替香烟得到广泛使用。
现有的电子烟，由于电池使用中电量、电能不断减少，使得电池的电压也不断降低，在电子烟烟液雾化时，烟雾量会不断减少。另外，为了防止电子烟在缺乏烟液时因温度急剧升高导致的干烧，需要采用具有阻值随温度变化的发热电阻，以便检测发热电阻的工作温度。然而随着工作温度的变化，发热电阻阻值的升高却会导致工作电压下降而造成功率下降，使得吸烟过程中烟雾量越来越小，给用户带来了不良的吸烟体验。
 技术问题
本发明的目的在于为克服上述技术的不足而提供一种恒功率防干烧电子烟，该恒功率防干烧电子烟可实现对发热电阻温度的监控，对电子烟实现防干烧保护功能的同时还可保持功率大小不变而使烟雾量保持不变。
 技术解决方案
本发明的技术方案是这样实现的：一种恒功率防干烧电子烟，包括雾化杆和电池杆，所述雾化杆内设有雾化器，所述雾化器包括用于加热并雾化电子烟烟液的发热电阻，所述电池杆内装有电池、电路控制板和解锁按键开关，所述雾化杆或电池杆内还设有吸烟开关，所述发热电阻为阻值可随温度变化并具有正温度系数的可变电阻，所述电路控制板上包括有微控制芯片、阻值检测单元、恒功率输出控制单元、输出反馈单元，所述解锁按键开关、吸烟开关与微控制芯片电连接，所述阻值检测单元与发热电阻电连接用于检测其阻值并将阻值信号反馈给微控制芯片，所述输出反馈单元与发热电阻电连接用于检测其工作电压并反馈给微控制芯片，所述恒功率输出控制单元与微控制芯片电连接以便接受微控制芯片的PWM控制信号，所述恒功率输出控制单元根据PWM控制信号产生相应的PWM电压值并输出至发热电阻，发热电阻的PWM电压值随发热电阻的阻值同步变化以保持相同的功率从而使发热电阻加热烟液产生的雾化量相同，同时所述微控制芯片将阻值信号与干烧设定值进行比较，当阻值信号超过干烧设定值时，所述微控制芯片切断恒功率输出控制单元的输出以防止电子烟温度过高而产生干烧。
优选地，所述电路控制板上还设有与所述电池电连接的电池充电单元、电池保护单元、电池供电单元和电池检测单元，所述微控制芯片分别与所述电池充电单元、电池保护单元、电池检测单元电连接。
优选地，所述雾化杆或电池杆外表设有显示单元与所述微控制芯片电连接优选地，所述微控制芯片包括20个引脚，其中，第1引脚连接所述阻值检测单元的阻值检测信号输出端，第3引脚连接接地端，第5引脚连接电池供电端，第8引脚连接所述阻值检测单元的控制信号端，第13引脚连接所述恒功率控制单元的PWM控制信号输入端，第15引脚与所述解锁按键开关信号端电连接，第17引脚与所述阻值检测单元的辅助阻值检测信号端连接，第19引脚与基准电压端连接，第20引脚与所述吸烟开关的信号端连接。
优选地，所述恒功率输出控制单元与所述阻值检测单元相互连接，所述阻值检测单元包括具有八个引脚的第一MOS管，所述第一MOS管的第3引脚为栅极，第4、5引脚相互连接为源极，第1、2、6、7、8引脚相互连接为漏极，所述第一MOS管的第3引脚为控制信号输入端，所述第一MOS管的源极通过电阻R 1与第3引脚连接，所述阻值检测单元还包括电阻R 5、R 3、R 11、R 24和电容C 1、C 2，所述第一MOS管的漏极串联电阻R 11、R 24后接地，电阻R 24两端并联电容C 1，电阻R 11与电阻R 24的连接点为阻值检测信号输出端，所述第一MOS管的漏极还分别与所述电阻R 5、R 3、电容C 2串联后接地，所述电阻R 3与电容C 2的连接点为辅助阻值检测信号端；所述恒功率输出控制单元包括具有八个引脚的第二MOS管，所述第二MOS管的第3引脚为栅极，第4、5引脚相互连接为源极，第1、2、6、7、8引脚均为漏极且相互连接后为PWM电压输出端，所述第二MOS管的第3引脚为所述恒功率控制单元的控制信号输入端，所述第二MOS管的第4、5引脚与电池正极连接，所述第二MOS管的第3引脚与第4、5引脚之间串联电阻R 7；所述第一MOS管的第4、5引脚同时与所述第二MOS管的第4、5引脚连接，所述电阻R 5与R 3之间的连接点与所述PWM电压输出端连接。
优选地，所述解锁按键开关一端接地，另一端为解锁按键开关输出信号端，该信号端同时与电池正极之间串联电阻R21。
优选地，所述吸烟开关包括3个引脚，其中，第1引脚为吸烟开关输出信号端MIC，第2引脚为接地端，第3引脚与电池正极之间串联电阻R 27，第3引脚同时与电容C 10串联后接地。
本发明的另一种技术方案是，一种恒功率防干烧电子烟的控制方法，该方法包括以下的步骤：
（1）设定干烧阻值预设值、功率预设值、待机时间预设值；
（2）微控制芯片判断是否处于开机状态，如果否，则进入下一步，如果是，则进入步骤（4）；
（3）解锁按键开关解锁，进行开机操作；
（4）微控制芯片判断吸烟开关是否打开，如果是，则进入下一步，如果否，则进入步骤（10）；
（5）阻值检测单元检测发热丝阻值，将阻值信号传递给微控制芯片；
（6）微控制芯片控制恒功率输出控制单元输出预设功率给发热电阻；
（7）微控制芯片判断发热电阻阻值是否增加，如果是，则进入下一步，如果否则进入步骤（4）；
（8）阻值检测单元检测阻值是否大于干烧预设值，如果是，则恒功率输出控制单元停止输出，闪红灯5下，进入步骤（12），如果否，则进入下一步；
（9）恒功率输出控制单元根据功率预设值调整PWM输出电压，保持恒功率输出；
（10）吸烟开关关闭，结束吸烟状态，进入待机状态；
（11）微控制芯片判断待机时间是否超过预设值，如果是，则进入下一步，如果否，则返回步骤（4）；
（12）进入关机状态。
 有益效果
本发明通过阻值检测单元检测发热电阻阻值的升高，经过微控制芯片的作用，使得恒功率输出单元输出PWM电压值给发热电阻，该PWM电压值随发热电阻的阻值同步变化以保持相同的功率从而使发热电阻加热烟液产生的雾化量相同，因此，本发明能够很好的实现电子烟防干烧的同时还可使烟雾量保持不变。
 附图说明
图1为本发明的恒功率防干烧电子烟的剖视图；
图2为本发明的电路板的功能结构图；
图3为本发明的微控制芯片的连接示意图；
图4为本发明的恒功率输出控制单元及阻值检测单元的电路原理图；
图5为本发明解锁按键开关的电路原理图；
图6为本发明吸烟开关的电路原理图；
图7为本发明恒功率输出单元输出PWM电压值的示意图；
图8为本发明控制方法的流程图。
 本发明的最佳实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用于解释本发明，并不用于限定本发明。
实施例：
如图1所示，本发明的一种恒功率防干烧电子烟，包括雾化杆1和电池杆2，雾化杆1内设有雾化器3，雾化器3包括用于加热并雾化电子烟烟液的发热电阻（图中未示），电池杆2内装有电池4和电路控制板5，发热电阻为阻值可随温度变化并具有正温度系数的可变电阻，电池杆2内设有解锁按键开关6，用户吸烟时，首先需要按压解锁按键开关6进行解锁操作。电池杆2内（也可以设在雾化杆1内）设有吸烟开关7，该吸烟开关7可以是气流感应开关，用户吸烟时产生的气流可以触动而打开该开关。
如图2、图7所示，电路控制板5上设有元件包括微控制芯片MCU、阻值检测单元、恒功率输出控制单元、输出反馈单元，解锁按键开关、吸烟开关与微控制芯片MCU电连接，阻值检测单元与发热电阻电连接用于检测其阻值并将阻值信号反馈给微控制芯片，输出反馈单元与发热电阻电连接用于检测其工作电压并反馈给微控制芯片，恒功率输出控制单元与微控制芯片电连接以便接受微控制芯片的PWM控制信号，恒功率输出控制单元根据PWM控制信号产生相应的PWM电压值并输出至发热电阻，发热电阻的PWM电压值随发热电阻的阻值同步变化以保持相同的功率从而使发热电阻加热烟液产生的雾化量相同，即根据PWM控制信号的大小产生不同占空比的PWM电压并输出给发热电阻，发热电阻的阻值越高则PWM电压在一定时间内的平均电压值也越高以便使发热电阻保持相同的功率从而使烟液加热产生的雾化量相同。同时，微控制芯片将阻值信号与干烧设定值进行对比，当阻值信号超过干烧设定值时，所述微控制芯片切断所述雾化器输出控制单元的输出以防止电子烟温度过高而产生干烧。图7为PWM电压值V随时间轴T变化的情况。
如图2所示，电路控制板5上还设有与所述电池电连接的电池充电单元、电池保护单元、电池供电单元和电池检测单元，所述微控制芯片分别与所述电池充电单元、电池保护单元、电池检测单元电连接。
如图3所示，所述微控制芯片包括20个引脚，其中，第1引脚连接所述阻值检测单元的阻值检测信号输出端R-DET，第3引脚连接接地端GND，第5引脚连接电池供电端VDD，第8引脚连接所述阻值检测单元的控制信号端R-DET-EN，第13引脚连接所述恒功率控制单元的PWM控制信号输入端PWM-EN，第15引脚与所述解锁按键开关信号端KEY-OUT电连接，第17引脚与所述阻值检测单元的辅助阻值检测信号端I-DET连接，第19引脚与基准电压端连接，第20引脚与所述吸烟开关的信号端连接。
如图4所示，所述恒功率输出控制单元与所述阻值检测单元相互连接，所述阻值检测单元包括具有八个引脚的第一MOS管Q 1，所述第一MOS管Q 1的第3引脚为栅极G，第4、5引脚相互连接为源极S，第1、2、6、7、8引脚相互连接为漏极D，所述第一MOS管的第3引脚为控制信号输入端R-DET-EN，所述第一MOS管的源极S通过电阻R1与第3引脚连接，所述阻值检测单元还包括电阻R 5、R 3、R 11、R 24和电容C 1、C 2，所述第一MOS管的漏极D串联电阻R 11、R 24后接地，电阻R 24两端并联电容C 1，电阻R 11与电阻R 24的连接点为阻值检测信号输出端R-DET，所述第一MOS管的漏极D还分别与所述电阻R 5、R 3、电容C 2串联后接地，所述电阻R 3与电容C 2的连接点为辅助阻值检测信号端I-DET；所述恒功率输出控制单元包括具有八个引脚的第二MOS管Q 2，所述第二MOS管Q 2的第3引脚为栅极G，第4、5引脚相互连接为源极S，第1、2、6、7、8引脚均为漏极D且相互连接后为PWM电压输出端PWM-OUT，所述第二MOS管的第3引脚为所述恒功率控制单元的控制信号输入端PWM-EN，所述第二MOS管的第4、5引脚与电池正极连接，所述第二MOS管的第3引脚与第4、5引脚之间串联电阻R 7；所述第一MOS管的第4、5引脚同时与所述第二MOS管的第4、5引脚连接，所述电阻R 5与R 3之间的连接点与所述PWM电压输出端PWM-OUT连接。图4虚线上半部为恒功率输出控制单元，虚线下半部为阻值检测单元。
如图5所示，所述解锁按键开关6一端接地，另一端为解锁按键开关输出信号端KEY-OUT，该信号端KEY-OUT同时与电池正极之间串联电阻R 21。
如图6所示，所述吸烟开关7包括3个引脚，其中，引脚R为吸烟开关输出信号端MIC，引脚GND为接地端，引脚VIN与电池正极之间串联电阻R 27，引脚VIN同时与电容C10串联后接地。
如图8所示，一种恒功率防干烧电子烟的控制方法，该方法包括以下的步骤：
（1）设定干烧阻值预设值、功率预设值、待机时间预设值；
（2）微控制芯片判断是否处于开机状态，如果否，则进入下一步，如果是，则进入步骤（4）；
（3）解锁按键开关解锁，进行开机操作；
（4）微控制芯片判断吸烟开关是否打开，如果是，则进入下一步，如果否，则进入步骤（10）；
（5）阻值检测单元检测发热丝阻值，将阻值信号传递给微控制芯片；
（6）微控制芯片控制恒功率输出控制单元输出预设功率给发热电阻；
（7）微控制芯片判断发热电阻阻值是否增加，如果是，则进入下一步，如果否则进入步骤（4）；
（8）阻值检测单元检测阻值是否大于干烧预设值，如果是，则恒功率输出控制单元停止输出，闪红灯5下，进入步骤（12），如果否，则进入下一步；
（9）恒功率输出控制单元根据功率预设值调整PWM输出电压，保持恒功率输出；
（10）吸烟开关关闭，结束吸烟状态，进入待机状态；
（11）微控制芯片判断待机时间是否超过设定值，如果是，则进入下一步，如果否，则返回步骤（4）；
（12）进入关机状态。
 工业实用性
以上所描述的仅为本发明的较佳实施例，上述具体实施例不是对本发明的限制。在本发明的技术思想范畴内，可以出现各种变形及修改，凡本领域的普通技术人员根据以上描述所做的润饰、修改或等同替换，均属于本发明所保护范围。

Claims (8)

  1. 一种恒功率防干烧电子烟，包括雾化杆和电池杆，所述雾化杆内设有雾化器，所述雾化器包括用于加热并雾化电子烟烟液的发热电阻，所述电池杆内装有电池、电路控制板和解锁按键开关，其特征在于：所述雾化杆或电池杆内还设有吸烟开关，所述发热电阻为阻值可随温度变化并具有正温度系数的可变电阻，所述电路控制板上包括有微控制芯片、阻值检测单元、恒功率输出控制单元、输出反馈单元，所述解锁按键开关、吸烟开关与微控制芯片电连接，所述阻值检测单元与发热电阻电连接用于检测其阻值并将阻值信号反馈给微控制芯片，所述输出反馈单元与发热电阻电连接用于检测其工作电压并反馈给微控制芯片，所述恒功率输出控制单元与微控制芯片电连接以便接受微控制芯片的PWM控制信号，所述恒功率输出控制单元根据PWM控制信号产生相应的PWM电压值并输出至发热电阻，发热电阻的PWM电压值随发热电阻的阻值同步变化以保持相同的功率从而使发热电阻加热烟液产生的雾化量相同，同时所述微控制芯片将阻值信号与干烧设定值进行比较，当阻值信号超过干烧设定值时，所述微控制芯片切断恒功率输出控制单元的输出以防止电子烟温度过高而产生干烧。
  2. 根据权利要求1所述的恒功率防干烧电子烟，其特征在于：所述电路控制板上还设有与所述电池电连接的电池充电单元、电池保护单元、电池供电单元和电池检测单元，所述微控制芯片分别与所述电池充电单元、电池保护单元、电池检测单元电连接。
  3. 根据权利要求1所述的恒功率防干烧电子烟，其特征在于：所述雾化杆或电池杆外表设有显示单元与所述微控制芯片电连接。
  4. 根据权利要求1所述的恒功率防干烧电子烟，其特征在于：所述微控制芯片包括20个引脚，其中，第1引脚连接所述阻值检测单元的阻值检测信号输出端，第3引脚连接接地端，第5引脚连接电池供电端，第8引脚连接所述阻值检测单元的控制信号端，第13引脚连接所述恒功率控制单元的PWM控制信号输入端，第15引脚与所述解锁按键开关信号端电连接，第17引脚与所述阻值检测单元的辅助阻值检测信号端连接，第19引脚与基准电压端连接，第20引脚与所述吸烟开关的信号端连接。
  5. 根据权利要求4所述的恒功率防干烧电子烟，其特征在于：所述恒功率输出控制单元与所述阻值检测单元相互连接，所述阻值检测单元包括具有八个引脚的第一MOS管，所述第一MOS管的第3引脚为栅极，第4、5引脚相互连接为源极，第1、2、6、7、8引脚相互连接为漏极，所述第一MOS管的第3引脚为控制信号输入端，所述第一MOS管的源极通过电阻R 1与第3引脚连接，所述阻值检测单元还包括电阻R 5、R 3、R 11、R 24和电容C 1、C 2，所述第一MOS管的漏极串联电阻R 11、R 24后接地，电阻R 24两端并联电容C 1，电阻R 11与电阻R 24的连接点为阻值检测信号输出端，所述第一MOS管的漏极还分别与所述电阻R 5、R 3、电容C 2串联后接地，所述电阻R 3与电容C 2的连接点为辅助阻值检测信号端；所述恒功率输出控制单元包括具有八个引脚的第二MOS管，所述第二MOS管的第3引脚为栅极，第4、5引脚相互连接为源极，第1、2、6、7、8引脚均为漏极且相互连接后为PWM电压输出端，所述第二MOS管的第3引脚为所述恒功率控制单元的控制信号输入端，所述第二MOS管的第4、5引脚与电池正极连接，所述第二MOS管的第3引脚与第4、5引脚之间串联电阻R7；所述第一MOS管的第4、5引脚同时与所述第二MOS管的第4、5引脚连接，所述电阻R5与R3之间的连接点与所述PWM电压输出端连接。
  6. 根据权利要求4所述的恒功率防干烧电子烟，其特征在于：所述解锁按键开关一端接地，另一端为解锁按键开关输出信号端，该信号端同时与电池正极之间串联电阻R21。
  7. 根据权利要求4所述的恒功率防干烧电子烟，其特征在于：所述吸烟开关包括3个引脚，其中，第1引脚为吸烟开关输出信号端MIC，第2引脚为接地端，第3引脚与电池正极之间串联电阻R27，第3引脚同时与电容C10串联后接地。
  8. 一种恒功率防干烧电子烟的控制方法，其特征在于：该方法包括以下的步骤：
    （1）设定干烧阻值预设值、功率预设值、待机时间预设值；
    （2）微控制芯片判断是否处于开机状态，如果否，则进入下一步，如果是，则进入步骤（4）；
    （3）解锁按键开关解锁，进行开机操作；
    （4）微控制芯片判断吸烟开关是否打开，如果是，则进入下一步，如果否，则进入步骤（10）；
    （5）阻值检测单元检测发热丝阻值，将阻值信号传递给微控制芯片；
    （6）微控制芯片控制恒功率输出控制单元输出预设功率给发热电阻；
    （7）微控制芯片判断发热电阻阻值是否增加，如果是，则进入下一步，如果否则进入步骤（4）；
    (8)阻值检测单元检测阻值是否大于干烧预设值，如果是，则恒功率输出控制单元停止输出，闪红灯5下，进入步骤（12），如果否，则进入下一步；
    (9)恒功率输出控制单元根据功率预设值调整PWM输出电压，保持恒功率输出；
    (10)吸烟开关关闭，结束吸烟状态，进入待机状态；
    (11)微控制芯片判断待机时间是否超过预设值，如果是，则进入下一步，如果否，则返回步骤(4)；
    (12)进入关机状态。
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