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WO2025074006A1 - Dispositif de génération d'aérosol à chauffage diélectrique doté d'un agencement d'électrodes interdigitées - Google Patents

Dispositif de génération d'aérosol à chauffage diélectrique doté d'un agencement d'électrodes interdigitées Download PDF

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Publication number
WO2025074006A1
WO2025074006A1 PCT/EP2024/078164 EP2024078164W WO2025074006A1 WO 2025074006 A1 WO2025074006 A1 WO 2025074006A1 EP 2024078164 W EP2024078164 W EP 2024078164W WO 2025074006 A1 WO2025074006 A1 WO 2025074006A1
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WIPO (PCT)
Prior art keywords
aerosol
electrode
generating device
forming substrate
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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PCT/EP2024/078164
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English (en)
Inventor
Oleg Mironov
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Philip Morris Products SA
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Philip Morris Products SA
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Filing date
Publication date
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Publication of WO2025074006A1 publication Critical patent/WO2025074006A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/48—Circuits
    • H05B6/50—Circuits for monitoring or 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
    • A24F40/20—Devices using solid 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
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/54—Electrodes
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/62—Apparatus for specific applications

Definitions

  • the present disclosure relates to aerosol-generating devices, and specifically to aerosolgenerating devices configured to heat an aerosol-forming substrate by dielectric heating.
  • the disclosure also relates to dielectric heating circuits for use in a dielectric heating aerosol-generating device and an aerosol-generating system.
  • Providing a first inductor coupled to a first side of the load capacitor and a second inductor coupled to a second side of the load capacitor enables more symmetrical voltages to be generated across the load capacitor, while also providing a 90° phase shift for effective resonant oscillating operation.
  • a biasing unit is coupled to an input terminal of the switching unit via the delay element.
  • the delay element is coupled to ground by a capacitor.
  • the time delay imposed by the delay element is between 5% to 35% of the period of the parallel resonant frequency fpAR of the resonant circuit.
  • the time delay imposed by delay element is between 35% and 90% of a difference between the period of the parallel resonant frequency fpAR and the period of the series resonant frequency fsER, preferably between 50% and 85% of a difference between the period of the parallel resonant frequency fpAR and the period series resonant frequency fsER.
  • the oscillation circuit further comprises the electrode arrangement fixedly interconnected to the two electrical contacts to form the load capacitor, the load capacitor including or being configured to removably receive an aerosol-forming substrate.
  • the oscillation circuit further comprises the electrode arrangement removably interconnected to the two electrical contacts to form the load capacitor, the load capacitor including or being configured to removably receive an aerosol-forming substrate.
  • the electrode arrangement may form part of an article comprising an aerosolforming substrate.
  • the electrode arrangement may be removable to facilitate easy insertion of an article comprising an aerosol-forming substrate in a heater area on or within the electrode arrangement prior to connection with the oscillation circuit.
  • the impedance of the feedback loop at the operation frequency is matched with the impedance of the switching unit, which improves the efficiency of the oscillation circuit.
  • the electrode arrangement may form a flat plate for heating an aerosol-forming substrate situated on a surface of the electrode arrangement.
  • the flat plate comprises a first electrode and a second electrode which is at least partially interdigitated with the first electrode.
  • the first electrode may comprise a first plurality of electrode portions and the second electrode may comprise a second plurality of electrode portions, wherein each of the first plurality of electrode portions are separated by one of the second plurality of electrode portions.
  • the electrode arrangement may comprise a first plate and a second plate, wherein the electrode arrangement is configured to heat an aerosol-forming substrate situated between the first plate and the second plate.
  • the first plate comprises a first electrode and a second electrode which is at least partially interdigitated with the first electrode.
  • the second plate may also comprises a first electrode and a second electrode which is at least partially interdigitated with the first electrode.
  • the first electrode may comprise a first plurality of electrode portions and the second electrode may comprise a second plurality of electrode portions, wherein each of the first plurality of electrode portions are separated by one of the second plurality of electrode portions.
  • the electrode arrangement may be cylindrical and define a central cavity for heating an aerosol-forming substrate situated within the cavity.
  • the aerosol-generating device further comprises a frequency sensing device configured to measure the frequency of an alternating electric field detected across an electrode assembly.
  • the frequency sensing device comprises a resonant cavity (or resonator) situated within or in the vicinity of the electrode arrangement.
  • low-dielectric constant or low relative permittivity refers to properties of a material measured at room temperature at a very low frequency (VLF), preferably below 1 kHz, e.g. as defined in the international standard IEC 62631 -2-1 :2018.
  • VLF very low frequency
  • the low dielectric constant carrier material may comprise a single dielectric layer and a single conductive layer. In another example, the low dielectric constant carrier material may comprise multiple dielectric or conductive layer.
  • the multi-layer example may comprise a double-sided flex PCB, or a four (4) layer flex PCB, or an adhesiveless polyimide double sided copper clad laminate.
  • the one or more temperature sensing tracks are formed from of PT100 or PT1000 sensing material.
  • a first portion of a temperature sensing track may be made of a first material and a second portion of the temperature sensing track may be formed of a second material having less temperature-dependent resistivity than the first material - e.g., a lower temperature coefficient of resistance (TCR).
  • the second material may comprise one of copper, aluminum.
  • the second material may have a larger cross-section than the first material.
  • the first material may be made of a high TCR material such as steel, or other alloy.
  • the first portion of the temperature sensing track may be the temperature sensing portion of the temperature sensing track.
  • the low-dielectric constant carrier material may comprise additional functional or structural layers, for example a metallic layer that can serve both as heat shielding and reflecting layer, and as electromagnetic shielding layer.
  • a metallic layer that can serve both as heat shielding and reflecting layer, and as electromagnetic shielding layer.
  • the heat shielding and reflecting layer covers an entire surface extension of the first and second electrodes.
  • an additional sensing layer can be provided to integrate temperature sensors and interconnection tracks for the measurement signals and sensor power supply lines.
  • Ex 8 The aerosol-generating device according to any of Ex2 to Ex7, wherein the feedback loop with the two electrical contacts is configured to operate as an inductive load at an operating frequency of the oscillation circuit.
  • Ex 20 The aerosol-generating device according to any of Ex2 to Ex19, wherein the feedback loop does not comprise a voltage transformer.
  • Ex 22 The aerosol-generating device according to any preceding Ex, wherein the oscillation circuit is configured to operate a frequency of between 100MHz-2.5GHz.
  • Ex 24 The aerosol-generating device according to any of Ex2 to Ex23, wherein the oscillation circuit is configured such that, during operation, a peak AC voltage across the two electrical contacts is greater than a supply voltage of the oscillation circuit.
  • Ex 27 The aerosol-generating device according to Ex26, wherein the two electrical contacts form a resonant circuit, wherein the delay element is configured such that an oscillation frequency of the oscillation circuit is below a parallel resonant frequency fPAR of the resonant circuit and above a series resonant frequency fSER of the resonant circuit.
  • Ex 36 The aerosol-generating device according to Ex35, wherein the first inductor comprises no more than five turns.
  • Ex 41 The aerosol-generating device according to any of Ex39 to Ex40, wherein a coil axis of the first inductor is arranged to be in parallel with and offset from a coil axis of the second inductor.
  • Ex 49 The aerosol-generating device according to any of Ex2 to Ex48, further comprising the electrode arrangement fixedly interconnected to the two electrical contacts and to form the load capacitor, the load capacitor including or being configured to removably receive an aerosol-forming substrate.
  • Ex 61 The aerosol-generating device according to any of Ex59 to Ex60, wherein the first electrode and the second electrode each comprise a plurality of electrode portions, wherein the electrode arrangement comprises: a first plate comprising a first electrode portion interdigitated with a second electrode portion; and a second plate comprising a first electrode portion interdigitated with a second electrode portion.
  • Ex 67 The aerosol-generating device according to Ex66, wherein the device is configured to independently energize one or more of the first plurality of electrode rings for providing sectional dielectric heating.
  • Ex 68 The aerosol-generating device according to Ex67, wherein the device is further configured to independently energize one or more of the second plurality of electrode rings for providing sectional dielectric heating.
  • An aerosol-generating system comprising: an aerosol-generating device according to any preceding Ex; and a load capacitor comprising an aerosol-forming substrate.
  • An aerosol-generating device dielectric heating circuit comprising: a first electrode configured to form a first part of a load capacitor; a second electrode configured to form a second part of the load capacitor; and a first inductor electrically coupled to the first electrode, wherein the first electrode, the second electrode and the first inductor are situated on a low- dielectric constant carrier material, wherein the low dielectric constant carrier material is configured to removably receive an aerosol-forming substrate between or adjacent to the first electrode and the second electrode for dielectric heating.
  • a low- dielectric constant carrier material is configured to removably receive an aerosol-forming substrate between or adjacent to the first electrode and the second electrode for dielectric heating.
  • Figure 3c is a schematic illustration of an oscillation circuit showing two different phaseshifting elements, one exemplarily implemented as a resonant cavity having parallel resonance properties, one exemplarily implemented as a capacitive element, to achieve a 180 degrees phase shift;
  • Figure 4 illustrates an oscillation circuit diagram according to embodiments of the disclosure
  • Figure 5A-F illustrate how a Quartz-mimicking or Quartz equivalent circuit may be derived, as a non-limiting example of a parallel-resonant circuit, according to embodiments of the disclosure
  • Figure 6 illustrates a frequency analyzer plot of a parallel resonant circuit showing the effect of the switching frequency on the phase shift and impedance of a parallel resonant circuit
  • Figure 10 shows a schematic illustrations of an interdigitated electrode arrangement with a varying electrode separation distance, according to embodiments of the disclosure
  • Figure 13a-c are schematic illustrations of electrode arrangements for dielectrically heating liquid aerosol-forming substrates configured to function as both a heater and wicking element, according to embodiments of the disclosure;
  • Figure 14A-C are isometric illustrations of coaxial electrode arrangements for use in the oscillation circuit of Figures 2 to 4, according to embodiments of the disclosure;
  • Figure 21 is an alternative schematic illustration of an oscillation circuit for use in the aerosolgenerating system of Figure 1 , according to embodiments of the disclosure;
  • Figure 22 is a schematic illustration of a control system utilizing a frequency sensing system for control the power delivered to an aerosol-forming substrate based on a frequency of an alternating electric field detected across an electrode assembly, according to embodiments of the disclosure.
  • FIG. 1 is a schematic illustration of a dielectric heating aerosol-generating system 100 according to an embodiment of the disclosure.
  • the system 100 comprises an article 105 comprising an aerosol-forming substrate 110 and an aerosol-generating device 120 for heating the aerosolforming substrate 110.
  • the aerosol-generating device 120 comprises a first electrode 130 and a second electrode 135 separated by a cavity 140 for receiving the article 105.
  • the cavity 140 and the article 105 are sized such that the aerosol-forming substrate 1 10 is in contact or in close proximity to both the first electrode 130 and the second electrode 135 when received within the cavity 140.
  • the first electrode 130 and the second electrode 135 form part of a feedback loop of an oscillation circuit 150 via a first and second electrical contact 160, 165.
  • the aerosol-forming substrate 110 may comprise tobacco-based or non-tobacco based materials having an aerosol forming material therein and one or more active agents or ingredients, such as nicotine, pharmaceutical, botanicals, flavorants, liquid substrates with one or more active agents or ingredients, or a combination thereof.
  • the aerosol-generating device 120 is activated by a user pressing an activation button (not shown) that can be provided on an external surface of the aerosol-generating device 120. It will be appreciated that in other embodiments, the aerosol-generating device 120 may be activated in another manner, such as on detection of a user drawing on a mouthpiece (not shown) by a puff sensor provided on the mouthpiece, or a user holding the aerosol-generating device 120.
  • the oscillation circuit 150 When power is supplied to the oscillation circuit 150, the oscillation circuit 150 generates an alternating electric field across the first and second electrodes 130, 135 to dielectrically heat the aerosol-forming substrate 110 in the cavity 140, releasing volatile compounds.
  • the oscillation circuit 250 can further comprise a choke 280 that acts on an input to the feedback loop 270 to provide for a stimulation signal, for example a stimulation voltage.
  • the oscillation circuit also comprise a biasing unit 290 acting on the feedback loop 270 for providing a variable or controllable biasing signal, for example a biasing voltage for setting the operating conditions.
  • the feedback signal can be described as a voltage.
  • the output voltage UOUT of the switching unit 260 is coupled to the feedback loop 270 providing a feedback switching signal in the form of a voltage UIN to the switching unit 260.
  • the configuration of the feedback loop 270 is such that the output signal, e.g.
  • the feedback loop 270 is configured to be self-oscillating and will oscillate at or close to a given resonance frequency determined by the values of the passive components of the feedback loop 270.
  • Feedback loop 270 is configured to provide a 180° phase shift from the output UOUT to input UIN of switching unit 260 for oscillation, and in addition, the transistor T is configured for inverting operation.
  • feedback loop 270 includes a resonant circuit 272 comprising the load capacitor CL providing for a first 90 degrees phase shift or quarter wave shift to the feedback signal.
  • the delay line D is a time delay element, for example an element that has inductive behavior, for slowing down the arriving voltage wave from the feedback loop 270 during a period of the oscillation.
  • This allows to tune the resonant circuit 272 to a desired switching and oscillation frequency, to move the oscillation frequency away from the natural resonant frequency given by the resonant circuit 272.
  • This ensures that oscillation circuit 350 remains in a predefined frequency operating range to provide for the requisite inverted or 90° phase shifted feedback and also to make sure that the feedback loop has a low impedance to provide for a high gain, as described in greater detail below.
  • a capacitor Ci is arranged in parallel to the transistor T and therefore in parallel with the intrinsic capacitor of the transistor T (e.g. a field effect transistor). This facilitates a less voltagedependent oscillation and frequency, stabilizes the oscillation, and also improves the overall dielectric heating efficiency.
  • Capacitance of capacitor Ci is chosen to be larger than the maximal intrinsic capacitor Ci of transistor T at the operating conditions, so that the variation of the intrinsic transistor based on frequency, temperature, etc. has much less or negligible influence on the feedback loop 270.
  • the value can be in a range between 2pF to 10OpF, more preferably in a range between 5pF and 50pF.
  • Resonant circuit 272 together with capacitive element 274, provides for a 180° phase shift and a voltage gain from the output UOUT to the input UIN, and transistor T (for example a FET) is configured for inverting operation, thereby also providing for another 180° phase shift.
  • transistor T for example a FET
  • the resonant circuit 272 circuit behaves inductively, having a high Q factor.
  • the feedback loop 270 is impedance-matched with the transistor T, to provide for a high gain, leading to an increased voltage across the load capacitor CL.
  • this gain is achieved without the use of an additional voltage or current amplifying passive element, such as a tapped inductor or a transformer located in the circuit that forms the feedback loop 270, as such passive elements are difficult and lossy to operate and design at frequencies greater than 50 MHz.
  • an additional voltage or current amplifying passive element such as a tapped inductor or a transformer located in the circuit that forms the feedback loop 270, as such passive elements are difficult and lossy to operate and design at frequencies greater than 50 MHz.
  • This split inductor principle can also be referred to as a split coil resonator.
  • LTOT can be a range between 10nH to 50nH, more preferably between 15nH and 40nH, which is the equivalent of Li plus L 2
  • L E could be in a range between 7nH and 30nH, more preferably between 10nH and 20nH
  • the value of the load capacitor can be in a range between 0.5pF to 5pF, more preferably between 1 pF to 3pF.
  • the heating efficiency should be at least 60% (desired power losses PL versus all the other losses, which can include switching losses of transistor T, losses caused by biasing circuit and choke, inductive-resistive losses of the inductors Li and L 2 , capacitive-resistive losses from capacitors Ci and C 2 , and resistive losses of electrodes Ei and E 2 and the wiring).
  • the overall power could be 10W
  • the effective power or heating losses PL should be 6W or more, with 4W or less of non-heating losses or other heating losses not caused in the substrate 1 10 between the first and second electrodes 130, 135.
  • the average dielectric heating power density may be controlled or set to operate in a range between 1 W/cm3 to 7W/cm3.
  • the average dielectric heating power density is controlled or set to operate in a range between 8W/cm3 to 20W/cm3.
  • the average dielectric heating power density is controlled or set to operate in a range between 1 W/cm3 to 5W/cm3.
  • the oscillation circuit 350 must remain in a frequency operating range where the behavior of the feedback loop 270 is highly inductive.
  • the series resonance frequency fsER resonant frequency
  • fp A R antiresonant frequency
  • the feedback loop 270 will act capacitively and not provide the necessary phase inversion to the feedback loop 270.
  • the equivalent impedance of the circuit will increase to an extent that is too high for efficient dielectric heating as the oscillation circuit 350 will not be able to provide a high signal gain.
  • the 90° phase shift starts dropping before the parallel resonance frequency f PA R is reached.
  • the phase shift response drops below 0° to capacitive behavior and the impedance is very high, e.g. 2.4kO.
  • the ideal operating frequency range is closer to the series resonance frequency fsER where the phase shift is still 90° and the impedance response is low.
  • the impedance of the resonant circuits at the operating frequency of the oscillation circuit may be between 0.5Q and 10O, preferably between 10 and 50, and more preferably, between 1.50 and 30.
  • the parallel resonance frequency f PA R can be above 1 GHz, e.g. 1 GHz to 1.5GHz, while the actual switching frequency fs can be below 1 GHz, and this lower switching frequency is caused by the delay line DL.
  • the delay caused by the delay line DL that acts on feedback loop 270 is in a range between 35% and 90% of a difference between the period of the parallel resonance frequency f PA R and the period of the series resonance frequency fsER, again providing that the above two conditions (i) and (ii) are fulfilled, more preferably a range between 50% and 85%.
  • a parallel resonance frequency is at 1 .25 GHz, therefore having a period of 800ps (picoseconds), and a series resonance is at 855MHZ, and therefore a period of 1 169ps, there is a difference of 369ps between the period of f PA R and fsER.
  • the time delay caused by delay line DL can be in the above range, for example at 70% of the period difference between f PAR and fsER, thereby being 258ps, thereby making sure that the feedback loop 270 has the desired inductive behavior and low impedance that is necessary to provide inverting feedback at high gain.
  • the delay line is implemented as a meandering conductive element having dominantly inductive behavior, for example a meandering element having from two (2) to twelve (12) meandering branches, more preferably from three (3) to eight (8) meandering branches.
  • a meandering conductive element having dominantly inductive behavior for example a meandering element having from two (2) to twelve (12) meandering branches, more preferably from three (3) to eight (8) meandering branches.
  • Such implementations exhibit minimal stray inductive and capacitive behavior.
  • Various delay line structures can be used to provide the desired function, for example an Omega-shaped coil, single planar coil, flat inductor, wavy line, zig-zag line, or a sawtooth line. It is also possible to provide the required delay line functionality by a specific transmission line design.
  • the physical element of the delay line DL is implemented as a conductor in a printed circuit board, for example implemented as a microstrip patch antenna.
  • a low-pass filter may be used as the delay line DL, however this will have an impact on the shape of the oscillating voltage, whereas a delay line DL that provides for a short time delay by inductive effect will not impact the wave shape.
  • delay line DL is placed between the feedback loop output of the resonant circuit 272 and capacitive element 274, but other arrangements are also possible.
  • Figures 7A-C are isometric illustrations of a split coil resonator having a mutual inductive coupling for use in the oscillation circuit of Figures 2 to 4, according to embodiments of the disclosure.
  • the two inductors Li and L 2 are each formed as a single winding, e.g.
  • Figure 7B illustrates an alternative split coil resonator arrangement, wherein instead of one full loop coil for Li and L 2 , an omega-shaped loop is used.
  • Other winding shapes are also possible while providing substantially the same functionality.
  • the inductors Li, L 2 of the split coil resonator of Figure 7B are arranged as planar coils in an omega-shape, single winding, or double winding coils, both on the same surface or plane, and are therefore not aligned in parallel to each other. This is desirable since the capacitive effect between the two inductors Li and L 2 can provide for unwanted additional dielectric losses.
  • the magnetic coupling by core M c is achieved via a u-shaped core with each leg traversing a center of each planar coil Li, L 2 .
  • the interdigitated electrode arrangement may comprise a first and second electrode configured to interdigitate together around a cylindrical axis to form a tubular structure.
  • thehe tubular structure can have a diameter between 5mm to 9mm.
  • the tangential distance between the electrodes of opposite polarity can be between 0.5 mm to 3 mm, preferably between 0.7 mm to 12.2 mm.
  • Figures 11 A-B show isometric and schematic illustrations of tubular interdigitated electrode arrangements for use in the oscillation circuit of Figures 2 and 3 configured to dielectrically heat an aerosol-forming substrate 1 10 positioned in a central cavity formed by the electrode arrangement.
  • the electrode arrangement in Figures 1 1 A-B comprises a series of axially aligned electrode bands positioned adjacent to electrode bands having opposing polarities.
  • the aerosol-forming substrate 1 10 is not positioned directly between opposing electrodes, but is still heated by the presence of the alternating electric field in its proximity.
  • FIG. 1 1 B Stronger and more uniform heating of the aerosol-forming substrate 110 may be achieved using the electrode arrangement shown in Figure 1 1 B, which is configured such that electrical field between opposing polarity electrodes is strongest across the aerosol-forming substrate 1 10.
  • Figures 1 1 C-D illustrate how the plurality of electrode portions from the electrode arrangements of Figure 11 A-B may be electrically connected to achieve an interdigitated configuration.
  • Figure 12D illustrates how electrodes of the electrode arrangement from the system of Figure 12C may be independently energized to provide sectional, zoned, or partial heating of a cylindrical substate 110.
  • the size of the heating zones may be modified by changing the geometry of the electrodes or the number of electrode pairs in the electrode arrangement.
  • a penetrating pin, rod, or blade is provided with the aerosol forming device 100, arranged centrally in the heating cavity.
  • the penetrating pin, rod, or blade can be made or coated with a material having a high dielectric constant.
  • the penetrating pin, rod, or blade can be configured and arranged such that it penetrates substantially into a central axis of the aerosol-forming substrate 110, when the aerosol-forming article 105 is inserted into the cavity.
  • the material chosen for the pin, rod, blade or the coating thereof should have a high dielectric constant, for example above 20, be non-conductive, and have good heat radiation properties and thermal stability, for example but not limited high-entropy or high dielectric ceramics.
  • Such pin, rod, or blade could act as a passive heater that would heat up in the oscillating electric fields, improving the heating performance in the center of the cylindrical aerosol-forming article 105.
  • Figures 13A to 13C-c illustrate alternative electrode arrangements for use as both a heater assembly and wicking element for dielectrically heating a liquid aerosol-forming substrate.
  • the arrangement of Figure 13a comprises a reservoir housing a liquid aerosol-forming substate 110 and a plurality of electrode plates situated adjacent to electrode plate of the opposite polarity.
  • the arrangement functions by generating an alternating electric field across adjacent electrode plates to dielectrically heat liquid aerosol-forming substrate situated between the adjacent electrodes.
  • the distance between adjacent electrode plates may be selected such that the channel between adjacent electrode plates has a capillary effect drawing the liquid aerosol-forming substate into the channel.
  • Figures 13b-c illustrate a similar electrode arrangement which uses an array of interlocking electrode pins rather than electrode plates.
  • the array of interlocking electrode pins is configured such that adjacent electrode pins have an opposite polarity.
  • Such electrode arrangements are particularly suited for providing uniform heating of the aerosol-forming substrate and avoiding localised overheating of the aerosol-forming substrate, which can lead to the generation of a poor quality aerosol.
  • the distance between adjacent electrode pins in the electrode array may be selected such that the region between adjacent electrode pins has a capillary effect, drawing the liquid aerosol-forming substate into the electrode array.
  • the first electrode Ei may be in the form of a rod situated within a tubular electrode E 2 .
  • the second electrode E 2 may comprise one or more openings, similar to the first electrode Ei of Figure 14A.
  • the tubular electrode E 2 may not extend entirely around the first electrode Ei, thereby creating another region for generated aerosol to laterally escape the electrode arrangement.
  • tubular electrode E 2 comprises two electrode portions separated by a gap enabling zoned or sectional heating across the length of an aerosol-forming substrate 1 10 situated between the electrodes Ei and E 2 .
  • the two electrode portions of tubular electrode E 2 may share the same polarity or they may be independently energized with the use of an analog signal demultiplexer 11 10 or by the use of selectively applying signals of different oscillators 150, 250, 350 to provide sectional, zoned or partial heating of an aerosol-forming substrate situated between the first electrode Ei and the tubular electrode E 2 .
  • Figure 16A is a schematic illustration of an electrode arrangement and two inductively coupled inductors Li, L 2 formed on a low dielectric constant flexible carrier material 1245, according to embodiments of the disclosure.
  • the arrangement comprises a first and second electrode 1230, 1235 formed on a flexible low dielectric constant carrier material 1245.
  • the flexible low dielectric constant carrier material 1245 further comprises a first inductor Li electrically coupled to the first electrode 1230 and a second inductor L 2 electrically coupled to the second electrode 1235.
  • the second inductor L 2 is provided on the opposite side of the flexible low dielectric constant carrier material 1245 to the first inductor Li aligned with the first inductor Li .
  • Quartz glass provides for optical transmission into the ultraviolet and infrared spectrum, and advantageously exhibits low thermal expansion so is able to endure repeated heating cycles without damage or degradation.
  • the smooth surfaces achievable with quartz glass provide a cavity 1340 with cleanable surfaces that can also reduce the accumulation of contaminants.
  • quartz glass has good thermal insulation properties that allows to provide heat insulation around the cavity 1340, for concentrating the heat within the aerosol-forming substrate 1310.
  • Quartz glass can also be machined or otherwise processed to form different shapes and arrangements. Additional features beneficial to the electrode arrangement may be formed directly into the glass structure, such as ribs, grooves, and channels for optimizing airflow through the aerosol-generating device.
  • the upstream air intake comes from ribs and grooves that are arranged to be in parallel with a rotational axis of a heating chamber comprising the electrode arrangement.
  • the heat sensor 1850 may comprise a sensor which either penetrates or is physically coupled to the surface of the aerosol-forming substrate, as illustrated in Figure 19.
  • the temperature sensing system may be configured to measure a temperature of the electrodes or of the air inside the cavity. However, since these are not dielectric they will heat-up following a substantially different temperature profile based on heat transfer from the aerosol-forming substrate.
  • a controller may receive a measured temperature of the electrodes or the air around the aerosol-forming substrate and calculate or deduce a value indicative of the substrate temperature, for example using one or more of a formula, correspondence table, look-up table, regression curve, and or by a trained artificial intelligence network.
  • the feedback loop of the oscillation circuit 1540 may be disrupted, for example by electrical or mechanical means.
  • the overall power consumption can be 10W-15W, preferably with an efficiency of at least 65%, and upon reaching aerosolization temperature of the aerosol former, the temperature can be controlled to 150°-220°, for example to achieve constant aerosol delivery for given session duration.
  • an oscillation unit may be coupled to a switching unit or buffer to convert a DC supply voltage to an AC signal fed to a resonant or quasi-resonant load circuit comprising the load capacitor.
  • a frequency sensor is used to correlate different power consumption patterns (e.g. DC current that is fed from the power source by power analysis) with the frequency of oscillation for a particular oscillation circuit and aerosol-forming substrate type.
  • a control system can then use a power consumption value (DC supply current, voltage, both) as a parameter that is indicative of a depletion of a substrate.
  • the resonator is connected via a direct electric coupler to a rectifier for generating a DC signal.
  • the generated DC signal is fed to a resistor/impedance to be measured by a voltage measurement device.
  • the voltage measurements are transmitted to a controller/microprocessor for calibration/further processing.
  • the system may utilize one or more of resonant antennas, microstrips, waveguides, for high-frequency sensing.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

L'invention concerne un dispositif de génération d'aérosol (120) pour chauffer diélectriquement un substrat de formation d'aérosol (110). Le dispositif (120) comprend un circuit d'oscillation (150) et un agencement d'électrodes couplé au circuit d'oscillation. L'agencement d'électrodes forme un condensateur de charge pour chauffer diélectriquement le substrat de formation d'aérosol. L'agencement d'électrodes comprend une première électrode interdigitée.
PCT/EP2024/078164 2023-10-05 2024-10-07 Dispositif de génération d'aérosol à chauffage diélectrique doté d'un agencement d'électrodes interdigitées Pending WO2025074006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23201980.2 2023-10-05
EP23201980 2023-10-05

Publications (1)

Publication Number Publication Date
WO2025074006A1 true WO2025074006A1 (fr) 2025-04-10

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Application Number Title Priority Date Filing Date
PCT/EP2024/078164 Pending WO2025074006A1 (fr) 2023-10-05 2024-10-07 Dispositif de génération d'aérosol à chauffage diélectrique doté d'un agencement d'électrodes interdigitées

Country Status (1)

Country Link
WO (1) WO2025074006A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845329A (en) * 1988-11-21 1989-07-04 General Motors Corporation Moisture removal from visual glass surfaces by dielectric heating
WO2022184783A1 (fr) * 2021-03-02 2022-09-09 Philip Morris Products S.A. Système de génération d'aérosol chauffé diélectriquement à dimensions optimisées
EP3558038B1 (fr) * 2016-12-22 2022-11-30 Philip Morris Products S.A. Système de production d'aérosol avec paires d'électrodes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845329A (en) * 1988-11-21 1989-07-04 General Motors Corporation Moisture removal from visual glass surfaces by dielectric heating
EP3558038B1 (fr) * 2016-12-22 2022-11-30 Philip Morris Products S.A. Système de production d'aérosol avec paires d'électrodes
WO2022184783A1 (fr) * 2021-03-02 2022-09-09 Philip Morris Products S.A. Système de génération d'aérosol chauffé diélectriquement à dimensions optimisées

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