CN116616508A - Induction aerosol generating device and method thereof - Google Patents
Induction aerosol generating device and method thereof Download PDFInfo
- Publication number
- CN116616508A CN116616508A CN202310693101.0A CN202310693101A CN116616508A CN 116616508 A CN116616508 A CN 116616508A CN 202310693101 A CN202310693101 A CN 202310693101A CN 116616508 A CN116616508 A CN 116616508A
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- inductance
- aerosol
- induction
- susceptor
- temperature
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- 230000006698 induction Effects 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims description 38
- 239000000443 aerosol Substances 0.000 title abstract description 9
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims description 58
- 239000000758 substrate Substances 0.000 claims description 26
- 238000004861 thermometry Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 description 28
- 239000000463 material Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000000391 smoking effect Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910000889 permalloy Inorganic materials 0.000 description 6
- 230000005291 magnetic effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 1
- 239000010965 430 stainless steel Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000004899 c-terminal region Anatomy 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- -1 nickel metal hydride Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
-
- 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
- A24F40/465—Shape or structure of electric heating means specially adapted for induction heating
Landscapes
- General Induction Heating (AREA)
Abstract
The invention discloses an induction aerosol generating device, wherein a control element comprises an oscillating circuit and an induction temperature measuring module, the induction temperature measuring module comprises a change-over switch and an inductance meter circuit, the control element controls the change-over switch to enable the induction coil to be switched between a conducting state in the oscillating circuit and a conducting state in the inductance meter circuit, when the induction coil is in the conducting state in the inductance meter circuit, the inductance meter circuit detects the inductance of the induction coil, and the control element obtains the temperature of a receptor according to the inductance or controls the fluctuation electromagnetic field according to the inductance.
Description
Technical Field
The patent proposes to relate to novel tobacco smoking article field, specifically is the response temperature measurement scheme that is used for electromagnetic heating smoking article.
Background
There are two types of heating methods currently in common for heating non-combustible smoking articles: resistive heating and electromagnetic heating.
The heating function of electromagnetic heating includes a heating function and a temperature feedback function. There are two commonly seen electromagnetic temperature feedback modes: wired temperature measurement and wireless temperature measurement. In the aspect of wired temperature measurement, the current enterprises basically adopt a wired temperature measurement mode, and the current modes of track temperature measurement/PT 100 or PT1000 temperature measurement/NTC or PTC temperature measurement/thermocouples and the like are adopted. The wired temperature measurement is to arrange a temperature sensitive element on a receptor and connect the temperature sensitive element to a control system to obtain a temperature signal. The wired temperature measurement has the advantages that the temperature feedback signal is direct, the calculated amount is small, the sensor is electrically connected with the circuit board, the sensor cannot be independent of the structural member, and the sensor is required to be connected with the structural member, so that a heat conduction bridge is formed, and the heat utilization efficiency is reduced. From the thermal and structural design point of view, wireless temperature measurement is more advantageous because wired temperature measurement means that the susceptor is electrically connected with the PCBA, and the disassembly and assembly difficulties are both greater, and because wired temperature measurement means that the susceptor is not integrally designed with the cigarette, direct connection exists between the susceptor and the smoking set structural member, and when the susceptor heats, the connection becomes a heat bridge for heat transmission, and extra heat is overflowed. The wireless temperature measurement mode can avoid the situation, and the susceptor can be arranged in a cigarette (or other components), so that conductive heat loss is avoided.
Therefore, in order to avoid the defect of wired temperature measurement, a novel induction aerosol generating device needs to be developed to perform a novel temperature measurement method.
Disclosure of Invention
The invention aims to avoid the defect of wired temperature measurement, and needs to develop a novel induction aerosol generating device for performing a novel temperature measurement method.
In order to solve the technical problems, the invention adopts the following technical scheme:
an induction aerosol-generating device for heating an aerosol-generating article, the aerosol-generating article and/or the aerosol-generating device being provided with a susceptor, the aerosol-generating article comprising an aerosol-generating substrate which is in thermal contact with the susceptor in use, the aerosol-generating device comprising a housing, a heating chamber, an induction coil, a control element and a power supply; the heating chamber is for receiving at least a portion of the aerosol-generating article; the induction coil being arranged between the housing and the heating chamber, the induction coil being configured to draw a high frequency current from the power supply and to generate a fluctuating electromagnetic field under control of the control element to heat the susceptor and thereby the aerosol-forming substrate; the control element comprises an oscillating circuit and an induction temperature measuring module, the induction temperature measuring module comprises a change-over switch and an inductance meter circuit, the control element controls the change-over switch to enable the induction coil to be switched between being conducted with the oscillating circuit and being conducted with the inductance meter circuit, when the induction coil is conducted with the inductance meter circuit, the inductance meter circuit detects the inductance of the induction coil, and the control element obtains the temperature of the receptor according to the inductance or controls the fluctuation electromagnetic field according to the inductance.
Further, the control element obtains the temperature of the susceptor by looking up a table after obtaining the inductance.
An electromagnetic heating induction thermometry method for use with the induction aerosol-generating device, comprising: at step S101, the electromagnetic heating induction thermometry method starts; at step S102, switching to an inductance test mode; at step S103, the measured inductance of the induction coil is read; at step S104, it is judged whether the inductance is normal; if not, the method proceeds to step S105 for fault processing, and then proceeds to step S115, and the method is ended; if the inductance is normal, switching to an oscillating circuit mode at step S106; at step S107, a timer is started for timing; at step S108, heating the susceptor; at step S109, checking whether the timer overflows until it overflows, proceeding to step S110, switching to the inductance value test mode; at step S111, the inductance of the induction coil is read again; at step S112, calculating to obtain the susceptor temperature value; at step S113, it is judged whether or not the obtained temperature value is higher than the target temperature; if the temperature is higher than the target temperature, starting a timer at step S114 for timing, and returning to step S111; if not, returning to the step S106; the above operation is repeated until step S115 ends.
An induction aerosol-generating device for heating an aerosol-generating article, the aerosol-generating article and/or the aerosol-generating device being provided with a susceptor, the aerosol-generating article comprising an aerosol-generating substrate which is in thermal contact with the susceptor in use, the aerosol-generating device comprising a housing, a heating chamber, an induction coil, a control element and a power supply; the heating chamber is for receiving at least a portion of the aerosol-generating article; the induction coil being arranged between the housing and the heating chamber, the induction coil being configured to draw a high frequency current from the power supply and to generate a fluctuating electromagnetic field under control of the control element to heat the susceptor and thereby the aerosol-forming substrate; the control element comprises an oscillating circuit and an induction temperature measuring module, the induction temperature measuring module comprises an inductance meter circuit and an auxiliary coil, the auxiliary coil is arranged in the range of the fluctuation electromagnetic field, the control element controls the oscillating circuit and the inductance meter circuit to be started alternatively, when the inductance meter circuit is started, the inductance meter circuit detects the inductance of the auxiliary coil, and the control element obtains the temperature of the receptor according to the inductance or controls the fluctuation electromagnetic field according to the inductance.
Further, the control element obtains the temperature of the susceptor by looking up a table after obtaining the inductance.
Further, the distance between the secondary coil and the susceptor is set to be smaller than the radius of the induction coil.
Further, the secondary coil is fixedly connected with the susceptor.
Further, the secondary coil is disposed below the susceptor.
Further, the secondary coil is provided as a coil or wire coil.
Further, the sensing temperature measurement module comprises a switch, and the control element controls the oscillation circuit and the inductance meter circuit to be selectively conducted through the switch.
An electromagnetic heating induction thermometry method for use with the induction aerosol-generating device, comprising: at step S201, the electromagnetic heating induction thermometry method starts; at step S202, the oscillating circuit is turned off; at step S203, the inductance gauge circuit is started; at step S204, the measured inductance of the secondary coil is read; at step S205, it is judged whether the obtained inductance is normal; if not, the method proceeds to step S206 for fault processing, and then proceeds to step S217, where the method ends; if the inductance is normal, at step S207, the inductance gauge circuit is turned off; at step S208, a timer is started for timing; at step S209, heating the susceptor; at step S210, it is checked whether the timer overflows until it overflows, and the process proceeds to step S211, where the oscillation circuit is turned off; at step S212, the inductance gauge circuit is started; at step S213, the inductance of the sub-coil is read again; at step S214, a temperature value is calculated; at step S215, it is determined whether the obtained temperature value is higher than the target temperature; if the temperature is higher than the target temperature, starting a timer at step S216 for timing, and returning to step S213; if not, returning to the step S207; the above operation is repeated until the step S217 ends.
The aerosol-generating device is used to describe a device that interacts with an aerosol-generating substrate of an aerosol-generating article to generate an aerosol. Preferably, the aerosol-generating device is a smoking device which interacts with an aerosol-generating substrate of the aerosol-generating article to generate an aerosol which is directly inhalable into a user's lungs through a user's mouth. The aerosol-generating device may be a holder for a smoking article.
Susceptors refer to materials that may convert electromagnetic energy into heat. Eddy currents induced in the susceptor when located in a fluctuating electromagnetic field cause heating of the susceptor. When the elongated susceptor is positioned in thermal contact with the aerosol-generating substrate, the aerosol-generating substrate is heated by the susceptor.
The aerosol-generating article is designed to be engaged with an electrically operated aerosol-generating device comprising an inductively heated source. An inductive heating source or inductor generates a fluctuating electromagnetic field to heat a susceptor located within the fluctuating electromagnetic field. In use, the aerosol-generating article is engaged with the aerosol-generating device such that the susceptor is located within the fluctuating electromagnetic field generated by the inductor.
The length dimension of the susceptor is greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension. The susceptor may thus be described as an elongated susceptor. The susceptor may be arranged substantially longitudinally within the aerosol-generating substrate. This means that the length dimension of the elongated susceptor is arranged approximately parallel to the longitudinal direction of the aerosol-generating substrate, for example within plus or minus 10 degrees of parallel to the longitudinal direction of the aerosol-generating substrate. In a preferred embodiment, the elongated susceptor may be located at a radial central position within the aerosol-generating substrate and extend along the longitudinal axis of the aerosol-generating substrate.
The susceptor is preferably needle-shaped, strip-shaped or leaf-shaped. Preferably, the susceptor has a length of between 5mm and 15mm, for example between 6mm and 12mm or between 8mm and 10 mm. Preferably, the elongate susceptor has substantially the same length as the aerosol-generating substrate. Preferably, the susceptor may have a width of between 1mm and 5mm and a thickness of between 0.01mm and 2mm, for example a thickness of 0.5mm to 2 mm. Preferred embodiments may have a thickness of between 10 microns and 500 microns, more preferably between 10 microns and 100 microns. If the susceptor has a constant cross-section, for example a circular cross-section, it has a preferred width or diameter of 1mm to 5 mm.
The susceptor may be made of any material which is capable of being inductively heated to a temperature sufficient for the aerosol-generating substrate to generate an aerosol. Preferred susceptors comprise metal or carbon. Preferred susceptors may include ferromagnetic materials such as ferrite, ferromagnetic steel or stainless steel. Suitable susceptors may be or may include aluminum. Preferred susceptors may be made of 400 series stainless steel, such as grade 410, grade 420 or grade 430 stainless steel. When placed in an electromagnetic field having similar frequency and field strength values, different materials will consume different amounts of energy. Thus, parameters of the susceptor, such as material type, length, width and thickness, can be varied within a known electromagnetic field to provide the desired energy expenditure.
It is possible to heat the preferred sensor to a temperature exceeding 250 degrees celsius. Suitable susceptors may include a nonmetallic core with a metal layer disposed on the nonmetallic core, such as a metal trace formed on a surface of a ceramic core.
The susceptor may have an outer protective layer, such as a ceramic or glass protective layer that encapsulates the elongated susceptor, thereby forming a complete heating body. The susceptor may include a protective coating formed of glass, ceramic, or an inert metal formed on a core of susceptor material.
The susceptor is arranged in thermal contact with the aerosol-generating substrate. Thus, when the susceptor is heated, the aerosol-generating substrate is heated and an aerosol is formed. In one embodiment, a heating body comprising a susceptor is inserted into the aerosol-generating substrate, and the aerosol-generating device may comprise a single or a plurality of elongated heating bodies. In another embodiment, the aerosol-generating substrate may comprise a susceptor, alternatively the aerosol-generating substrate may comprise a plurality of susceptors, the susceptor may be in the form of an elongate shape, a particle shape, a mesh shape, a radiation shape, a tube shape, an hourglass shape, a spiral shape, etc.
The induction coil material is selected from materials with good conductive effect such as metal and the like; in addition, in this patent, the induction coil material should also have good elastic deformability, and spring steel, gold, silver, and other metals can be used.
The power source may be any suitable power source, for example a dc voltage source, such as a battery. In one embodiment, the power source is a lithium ion battery. Alternatively, the power source may be a nickel metal hydride battery, a nickel cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium iron phosphate, lithium titanate, or lithium polymer battery.
The control element may be a simple switch. Alternatively, the control element may be a circuit and may include one or more microprocessors or microcontrollers.
The aerosol-generating system may comprise an aerosol-generating device configured to receive the aerosol-generating article in a corresponding number of heating chambers, and one or more aerosol-generating articles.
The invention avoids the direct arrangement of the temperature sensing element on the susceptor, and indirectly measures the temperature of the susceptor by detecting the change of the inductance of the heating coil (or additionally adding a temperature measuring coil), thereby avoiding the direct connection of the susceptor and a control system, enabling the susceptor to be separated from a smoking set structure, and reducing the heat conduction between the susceptor and the smoking set structure.
Drawings
The foregoing aspects of the invention and the following detailed description will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions. In the drawings, like reference numbers indicate identical or similar elements.
FIG. 1 is a graph of the relative permeability of permalloy material;
FIG. 2 is a schematic diagram of an electromagnetic heating induction temperature measurement module according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating an electromagnetic heating induction temperature measurement module according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of an electromagnetic heating induction temperature measurement module according to a second embodiment of the present invention;
FIG. 5 is a flowchart illustrating an electromagnetic heating induction temperature measurement module according to a second embodiment of the present invention;
FIG. 6 is a circuit diagram of an inductance gauge circuit in a first embodiment of the invention;
fig. 7 is a schematic diagram of an inductance measuring chip according to a third embodiment of the present invention.
Wherein reference numerals are as follows:
1. induction coil
2. Susceptor
3. Change-over switch
4. Auxiliary coil
5. Tap head
6. Oscillating circuit
7. Inductance gauge circuit
8MCU
Detailed Description
The detailed features and advantages of the present invention will be readily apparent to those skilled in the art from that description, claims, and drawings.
It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present patent.
For the purpose of making the objects, technical solutions and advantages of the present patent more apparent, the embodiments of the present patent will be described in further detail below with reference to the accompanying drawings.
The object of the present patent is to provide an inductive aerosol-generating device for heating an aerosol-generating article, the aerosol-generating article and/or the aerosol-generating device being provided with a susceptor, the aerosol-generating article comprising an aerosol-generating substrate which in use is in thermal contact with the susceptor, the aerosol-generating device comprising a housing, a heating chamber, an induction coil 1, a control element and a power supply; the heating chamber is for receiving at least a portion of an aerosol-generating article; an induction coil 1 is arranged between the housing and the heating chamber, the induction coil 1 being configured to take a high frequency current from a power supply and to generate a fluctuating electromagnetic field under control of the control element to heat the susceptor 2 and thereby the aerosol-forming substrate. The method is characterized in that a coil and a susceptor positioned in the coil are regarded as an inductor with an iron core, and the temperature change of the susceptor is indirectly obtained by measuring the change of the inductance value by utilizing the law that the relative permeability of the iron core changes along with the change of the magnetic permeability of the iron core.
As shown in FIG. 1, a permalloy with a trade name of 1J85 is taken as an example of a permalloy relative permeability VS temperature relationship curve, and permalloy is a typical susceptor material. The relative permeability of permalloy material decreases non-linearly with increasing temperature. Taking 1J85 as an example, the curie temperature is 400 degrees celsius, that is, the relative permeability of 1J85 gradually decreases with increasing temperature until the temperature reaches 400 degrees celsius, and the relative permeability decreases to zero.
According to the calculation formula of the non-air core inductance:
L＝(0.4πμN 2 ×Afe)/l
in the above formula:
l is inductance;
pi is the circumference ratio;
μ is the magnetic permeability of the susceptor (such as permalloy) in the coil;
n is the number of turns of the coil;
afe is the cross-sectional area of the susceptor;
l is the magnetic path length;
from the above equation, the coil inductance and the magnetic permeability are in direct proportion. When the magnetic permeability changes, the inductance of the coil changes accordingly.
Experiment one: the influence of the temperature rise of the core (i.e. the susceptor) on the inductance is compared with the air core inductance. The air core inductance is measured by the inductance value respectively, the inductance of the iron core at normal temperature and the inductance value difference of the iron core put into the coil after being heated (the same coil is used under three conditions, and basically the same environmental parameters).
The recording is as follows:
| status of | Test frequency | Inductance value |
| Hollow core | 100k | 0.654uH |
| Normal temperature iron core | 100k | 0.708uH |
| The iron core is baked for 10 seconds and then put into the coil | 100k | 0.666uH |
Experiments prove that the coil provided with iron cores with different temperatures reacts to change in inductance.
The specific implementation method for feeding back the temperature of the susceptor by utilizing the variation of inductance comprises the following steps: firstly, directly measuring the change of inductance of a heating coil; secondly, a secondary coil (the coil is not required to be molded and can be cylindrical, disc-shaped, square, multi-deformation and the like) is additionally arranged, and the secondary coil is arranged as close to a receptor as possible.
As shown in fig. 2, in the first embodiment of the induction aerosol-generating device, the control element comprises an oscillating circuit 6 and an induction thermometry module comprising a change-over switch 3 and an inductance meter circuit 7.
The control element preferably controls the changeover switch 3 via the MCU8 such that the induction coil 1 is switched between the on state in the oscillating circuit 6 and the on state in the inductance meter circuit 7.
When the circuit is in a heating state, the control element controls the change-over switch 3 through the MCU8, and the change-over switch 3 is switched to be connected with the oscillating circuit 6, namely, the a connection a1\b connection b1 of the change-over switch 3. At this time, the induction coil 1 heats the susceptor 2.
When the temperature of the susceptor 2 needs to be measured, the MCU8 controls the multi-path controllable switch 3 to switch the change-over switch 3 to be connected with the inductance meter circuit 7 (at the moment, the oscillation circuit 7 is separated from the induction coil 1), namely, the a connection a2\b of the change-over switch 3 is connected with the b2. When the induction coil 1 is in an on state in the inductance gauge circuit 7, the inductance gauge circuit 7 detects the inductance of the induction coil 1 (with the susceptor 2 inside), and the control element obtains the temperature of the susceptor 2 from the inductance or controls the fluctuating electromagnetic field from the inductance. The control element can obtain the instant temperature of the susceptor 2 according to the inductance value through table lookup (or other modes such as real-time calculation, online inquiry and the like) so as to complete the temperature measurement action; physical parameters related to the control fluctuation electromagnetic field can be obtained through table lookup (or other modes such as real-time calculation, online inquiry and the like) according to the inductance value, and the induction coil 1 can be directly adjusted.
Fig. 3 is a flowchart of an electromagnetic heating induction temperature measurement method in the first embodiment. Thus, in the inductive thermometry module shown in FIG. 2, it is configured to provide functionality according to the method shown in FIG. 3.
At step S101, the electromagnetic heating induction thermometry method starts.
At step S102, the inductance test mode is switched. At step S103, the measured inductance is read.
At step S104, it is determined whether the obtained inductance is normal. If not, the process proceeds to step S105 to perform fault processing, and then proceeds to step S115, where the method ends. If the inductance is normal, at step S106, switching is made to the oscillation circuit mode.
At step S107, a timer is started for timing.
At step S108, the oscillator is started to heat the susceptor.
At step S109, it is checked whether or not the timer overflows until it overflows, and the flow proceeds to step S110, where the mode is switched to the inductance test mode.
At step S111, the inductance of the induction coil is read again.
At step S112, a susceptor temperature value is calculated.
At step S113, it is determined whether the obtained temperature value is higher than the target temperature. If the temperature is higher than the target temperature, a timer is started at step S114 to time, and the process returns to step S111. If not, returning to the step S106.
The above operation is repeated until step S115 ends.
As shown in fig. 4, in the second embodiment of the induction aerosol-generating device, the control element comprises an oscillating circuit 6 and an induction thermometry module comprising an inductance gauge circuit and a secondary coil 4.
The control element preferably controls the on state of the oscillating circuit 6 and the on state of the inductance meter circuit 7 through MCU8 software, and the two are alternatively started. The control element can also control the oscillating circuit 6 and the inductance meter circuit 7 by switching the switches.
When the circuit is in a heated state, the control element starts the oscillating circuit 6 on the basis of ensuring that the inductance meter circuit 7 is turned off. At this time, the induction coil 1 heats the susceptor 2.
When the temperature measurement is needed, the oscillating circuit 6 is closed, the inductance gauge circuit 7 is started, the instant inductance of the secondary coil 4 is detected, and the inductance value is transmitted to the MCU8. When the inductance gauge circuit 7 is started, the inductance gauge circuit 7 detects the inductance of the secondary coil 4, and the control element obtains the temperature of the susceptor 2 from the inductance or directly controls the relevant physical parameters of the fluctuating electromagnetic field from the inductance. The control element can obtain the instant temperature of the susceptor 2 according to the inductance value through table lookup (or other modes such as real-time calculation, online inquiry and the like) so as to complete the temperature measurement action; physical parameters related to the control fluctuation electromagnetic field can be obtained through table lookup (or other modes such as real-time calculation, online inquiry and the like) according to the inductance value, and the induction coil 1 can be directly adjusted.
The sub-coil 4 may be coil-shaped or wire-coil-shaped, and may be circular, square, rectangular, polygonal, or the like, without limiting the shape thereof. The tap 5 of the secondary winding 4 is connected to an inductance gauge circuit 7.
The secondary coil 4 should be arranged as close as possible to the susceptor. Preferably, the distance of the secondary coil 4 from the susceptor 2 is set smaller than the radius of the induction coil 1. Preferably, the secondary coil 4 is arranged below the susceptor 2.
Fig. 5 is a flowchart of an electromagnetic heating induction temperature measurement method in the second embodiment. Thus, in the inductive thermometry module shown in FIG. 4, it is configured to provide functionality according to the method shown in FIG. 5.
At step S201, the electromagnetic heating induction thermometry method starts.
At step S202, the oscillating circuit is turned off. At step S203, the inductance gauge circuit is started; and at step S204, the measured secondary inductance is read.
At step S205, it is determined whether the obtained inductance is normal. If not, the process proceeds to step S206 to perform fault processing, and then to step S217, where the method ends. If the inductance is normal, the inductance gauge circuit is turned off at step S207.
At step S208, a timer is started for timing.
At step S209, the oscillator heating susceptor is started.
At step S210, it is checked whether or not the timer overflows until it overflows, and the flow proceeds to step S211, where the oscillation circuit is turned off.
At step S212, the inductance gauge circuit is started.
At step S213, the sub-coil inductance is read again.
At step S214, a temperature value is calculated.
At step S215, it is determined whether the obtained temperature value is higher than the target temperature. If the temperature is higher than the target temperature, a timer is started at step S216 to time, and the process returns to step S213. If not, the process returns to step S207.
The above operation is repeated until the step S217 ends.
As shown in fig. 6, the inductance gauge circuit used in the first embodiment. Wherein D1 is a varactor diode, and the potentiometer VR1 is used to adjust the output voltage of the potentiometer, which is applied to D1 through R1, so as to adjust the capacitance of D1.
The inductor under test is connected to both ends of A, B. VR1 is adjusted to cause the circuit to resonate, at which point the frequency at the C-terminal is measured. And the resonant frequency of the circuit is:
F0＝1/(2π(L×C) 1/2 )
and then the L value can be obtained:
L＝1/(4πF 0 2 C)
as shown in fig. 7, in the third embodiment, an inductance measurement dedicated chip may be used instead of the inductance gauge circuit 7. Preferably, the inductance measuring chip may be an LDC1312. The inductor under test is connected to both ends of A, B. SD, INTB, SDA, SCK is connected to the MCU. The SD signal is used for controlling whether to start inductance detection; the INTB signal is a measurement completion output signal; SDA\SCK is the communication signal. After the LDC1312 finishes measuring, directly converting the inductance value signal into a digital signal, and sending the digital signal to the MCU through sda\sck.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of these terms and expressions is not meant to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible and are intended to be included within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that while the present invention has been described with reference to the particular embodiments presently, it will be appreciated by those skilled in the art that the above embodiments are provided for illustration only and that various equivalent changes or substitutions may be made without departing from the spirit of the invention, and therefore, the changes and modifications to the above embodiments shall fall within the scope of the claims of the present invention as long as they are within the true spirit of the invention.
Claims (10)
1. An induction aerosol-generating device for heating an aerosol-generating article, the aerosol-generating article and/or the aerosol-generating device being provided with a susceptor, the aerosol-generating article comprising an aerosol-generating substrate which is in thermal contact with the susceptor in use, the aerosol-generating device comprising a housing, a heating chamber, an induction coil, a control element and a power supply;
the heating chamber is for receiving at least a portion of the aerosol-generating article;
the induction coil being arranged between the housing and the heating chamber, the induction coil being configured to draw a high frequency current from the power supply and to generate a fluctuating electromagnetic field under control of the control element to heat the susceptor and thereby the aerosol-forming substrate;
the induction temperature measuring device is characterized in that the control element comprises an oscillating circuit and an induction temperature measuring module, the induction temperature measuring module comprises a change-over switch and an inductance meter circuit, the control element controls the change-over switch to enable the induction coil to be switched between being conducted with the oscillating circuit and being conducted with the inductance meter circuit, when the induction coil is conducted with the inductance meter circuit, the inductance meter circuit detects the inductance of the induction coil, and the control element obtains the temperature of the receptor according to the inductance or controls the fluctuation electromagnetic field according to the inductance.
2. An induction aerosol-generating device according to claim 1, wherein the control element obtains the temperature of the susceptor by looking up a table after obtaining the inductance.
3. An electromagnetic heating induction thermometry method for use in an induction aerosol-generating device as claimed in claims 1-2, comprising:
at step S101, the electromagnetic heating induction thermometry method starts;
at step S102, switching to an inductance test mode; at step S103, the measured inductance of the induction coil is read;
at step S104, it is judged whether the inductance is normal; if not, the method proceeds to step S105 for fault processing, and then proceeds to step S115, and the method is ended; if the inductance is normal, switching to an oscillating circuit mode at step S106;
at step S107, a timer is started for timing;
at step S108, heating the susceptor;
at step S109, checking whether the timer overflows until it overflows, proceeding to step S110, switching to the inductance value test mode;
at step S111, the inductance of the induction coil is read again;
at step S112, calculating to obtain the susceptor temperature value;
at step S113, it is judged whether or not the obtained temperature value is higher than the target temperature; if the temperature is higher than the target temperature, starting a timer at step S114 for timing, and returning to step S111; if not, returning to the step S106;
the above operation is repeated until step S115 ends.
4. An induction aerosol-generating device for heating an aerosol-generating article, the aerosol-generating article and/or the aerosol-generating device being provided with a susceptor, the aerosol-generating article comprising an aerosol-generating substrate which is in thermal contact with the susceptor in use, the aerosol-generating device comprising a housing, a heating chamber, an induction coil, a control element and a power supply;
the heating chamber is for receiving at least a portion of the aerosol-generating article;
the induction coil being arranged between the housing and the heating chamber, the induction coil being configured to draw a high frequency current from the power supply and to generate a fluctuating electromagnetic field under control of the control element to heat the susceptor and thereby the aerosol-forming substrate;
the induction temperature measuring device is characterized in that the control element comprises an oscillating circuit and an induction temperature measuring module, the induction temperature measuring module comprises an inductance value measuring circuit and an auxiliary coil, the auxiliary coil is arranged in the range of the fluctuation electromagnetic field, the control element controls the oscillating circuit and the inductance value measuring circuit to be selectively turned on, when the inductance value measuring circuit is started, the inductance value measuring circuit detects the inductance value of the auxiliary coil, and the control element obtains the temperature of the receptor according to the inductance value or controls the fluctuation electromagnetic field according to the inductance value.
5. An induction aerosol-generating device according to claim 4, wherein the control element obtains the temperature of the susceptor by looking up a table after obtaining the inductance.
6. An induction aerosol-generating device according to claim 4, wherein the distance of the secondary coil from the susceptor is set to be smaller than the radius of the induction coil.
7. An induction aerosol-generating device according to claim 4, wherein the secondary coil is arranged below the susceptor.
8. An induction aerosol-generating device according to claim 4, wherein the secondary coil is provided as a coil or wire coil.
9. An inductive aerosol-generating device according to claim 4, wherein the inductive thermometry module comprises a switch by which the control element controls the oscillating circuit and the inductance meter circuit to be selectively switched on.
10. An electromagnetic heating induction thermometry method for use in an induction aerosol-generating device as claimed in claims 4 to 9, comprising:
at step S201, the electromagnetic heating induction thermometry method starts;
at step S202, the oscillating circuit is turned off; at step S203, the inductance gauge circuit is started; at step S204, the measured inductance of the secondary coil is read;
at step S205, it is judged whether the obtained inductance is normal; if not, the method proceeds to step S206 for fault processing, and then proceeds to step S217, where the method ends; if the inductance is normal, at step S207, the inductance gauge circuit is turned off;
at step S208, a timer is started for timing;
at step S209, heating the susceptor;
at step S210, it is checked whether the timer overflows until it overflows, and the process proceeds to step S211, where the oscillation circuit is turned off;
at step S212, the inductance gauge circuit is started;
at step S213, the inductance of the sub-coil is read again;
at step S214, a temperature value is calculated;
at step S215, it is determined whether the obtained temperature value is higher than the target temperature; if the temperature is higher than the target temperature, starting a timer at step S216 for timing, and returning to step S213; if not, returning to the step S207;
the above operation is repeated until the step S217 ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310693101.0A CN116616508A (en) | 2023-06-12 | 2023-06-12 | Induction aerosol generating device and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310693101.0A CN116616508A (en) | 2023-06-12 | 2023-06-12 | Induction aerosol generating device and method thereof |
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| CN116616508A true CN116616508A (en) | 2023-08-22 |
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| CN202310693101.0A Pending CN116616508A (en) | 2023-06-12 | 2023-06-12 | Induction aerosol generating device and method thereof |
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| Country | Link |
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| CN (1) | CN116616508A (en) |
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