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WO2025074007A1 - Dispositif de génération d'aérosol à chauffage diélectrique ayant un inducteur à faible enroulement - Google Patents

Dispositif de génération d'aérosol à chauffage diélectrique ayant un inducteur à faible enroulement Download PDF

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Publication number
WO2025074007A1
WO2025074007A1 PCT/EP2024/078165 EP2024078165W WO2025074007A1 WO 2025074007 A1 WO2025074007 A1 WO 2025074007A1 EP 2024078165 W EP2024078165 W EP 2024078165W WO 2025074007 A1 WO2025074007 A1 WO 2025074007A1
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WO
WIPO (PCT)
Prior art keywords
aerosol
inductor
electrode
generating device
oscillation circuit
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
Application number
PCT/EP2024/078165
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English (en)
Inventor
Oleg Mironov
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Philip Morris Products SA
Original Assignee
Philip Morris Products SA
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Filing date
Publication date
Application filed by Philip Morris Products SA filed Critical Philip Morris Products SA
Publication of WO2025074007A1 publication Critical patent/WO2025074007A1/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
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • 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
    • 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
    • A24F40/20—Devices using solid inhalable precursors

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.
  • a problem with these heating mechanisms is that they may give rise to non-uniform heating of the aerosol-forming substrate.
  • the portion of the aerosol-forming substrate closest to the heating element is heated more quickly or to a higher temperature than portions of the aerosol-forming substrate more remote from the heating element.
  • an aerosol-generating device including any one or more of the features described below.
  • the aerosol-generating device may comprise an oscillation circuit.
  • the oscillation circuit may comprise a switching unit and a feedback loop connected across the switching unit.
  • the feedback loop may comprise two electrical contacts configured to interconnect with an electrode arrangement that forms a load capacitor for dielectrically heating the aerosol-forming substrate.
  • the aerosolgenerating device may further comprise any of the features described below alone or in combination with any other feature of the disclosure.
  • the term “aerosol-generating device” relates to a device that interacts with an article comprising an aerosol-forming substrate to generate an aerosol.
  • the term “aerosol-forming substrate” relates to a substrate capable of releasing volatile compounds that can form an aerosol. Such volatile compounds can be released by heating the aerosol-forming substrate.
  • an aerosol-generating device for dielectrically heating an aerosol-forming substrate.
  • the device comprises an oscillation circuit comprising a switching unit configured for inverting operation and a feedback loop connected across the switching unit.
  • the feedback loop comprises two electrical contacts configured to interconnect with an electrode arrangement that forms a load capacitor for dielectrically heating the aerosolforming substrate.
  • the feedback loop is configured to perform resonant oscillating operation.
  • the feedback loop is configured to provide a 180° phase shift between an output signal of the switching unit and an input switching signal of the switching unit.
  • the oscillation circuits of the present disclosure enable more efficient dielectric heating of an aerosol-forming substrate by facilitating the coupling of a load capacitor electrode arrangement within the feedback loop of the oscillation circuit.
  • the resonant oscillating operation of the feedback loop is able to generate high peak voltages across the load capacitor at high frequencies to deliver power to an aerosol-forming substrate within the electrode arrangement while maintaining the supply voltage across the switching unit, thereby keeping switching losses to a minimum.
  • the oscillation circuits of the present disclosure may be configured to be self-oscillating; that is, the oscillation circuit itself controls the phase with which the external power acts on it.
  • the feedback unit is configured to provide a 180° phase shift between an output signal of the switching unit and an input switching signal of the switching unit. This allows for effective resonant oscillating operation to occur.
  • the feedback loop further comprises the electrode arrangement coupled between the two electrical contacts.
  • the electrode arrangement is coupled to, or configured to be coupled to a resonant cavity for housing an aerosol-forming substrate to be dielectrically heated via the electrode arrangement.
  • an aerosol-generating device for dielectrically heating an aerosol-forming substrate.
  • the device comprises an oscillation circuit.
  • the oscillation circuit comprises a switching unit and a feedback loop connected across the switching unit.
  • the feedback loop comprises a series connection of a first inductor, two electrical contacts configured to interconnect with an electrode arrangement that forms a load capacitor for heating the aerosol-forming substrate, and a second inductor.
  • the mutual inductive coupling between the first and second inductor may be between 40% and 70% (or has an inductive coupling coefficient from 0.4 to 0.7), and preferably greater than 50% (or has an inductive coupling coefficient greater than 0.5).
  • the mutual inductive coupling between the first and second inductors may be achieved by the close proximity between the first and second inductors.
  • a mutual inductive coupling between the first and second inductors is achieved with the use of a magnetic core extending through both the first and second inductors. The use of a magnetic core may facilitate a stronger inductive coupling between the first and second inductors than that achievable based on close proximity alone.
  • a planar extension of the first inductor intersects the second inductor.
  • an aerosol-generating device for dielectrically heating an aerosol-forming substrate.
  • the device comprises an oscillation circuit.
  • the oscillation circuit comprises a switching unit and a feedback loop connected to the switching unit.
  • the feedback loop comprises a series connection of a first inductor and two electrical contacts configured to interconnect with an electrode arrangement that forms a load capacitor for heating the aerosol-forming substrate.
  • the oscillation circuit further comprises a delay element configured to impede the switching speed of the switching unit. Specifically, the delay element may delay a switching signal received by the switching unit.
  • a delay-line oscillator is a form of electronic oscillator that uses a delay line, or delay element as its principal timing element.
  • a delay-line oscillator may be set to oscillate by inverting the output of the delay line or delay element and feeding that signal back to the input of the delay line or delay element with appropriate amplification.
  • the oscillation circuit is configured to operate a frequency of between 100MHz-2.5GHz, and preferably between 500MHz-1 ,5GHz.
  • the oscillation frequency in the feedback loop will increase towards a certain resonance frequency based on the passive properties of the components in the feedback loop.
  • the feedback loop starts to lose the inductive properties that provide the necessary phase shift for effective resonant oscillating operation.
  • the impedance of the feedback loop increases, reducing the dielectric heating efficiency in the load capacitor.
  • the maximum oscillation frequency may be limited to a frequency range in which the feedback loop behaves inductively and has a low impedance for efficient dielectric heating.
  • 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 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 delay element has an inductive behaviour.
  • inductive delay elements may provide the required time delay without impacting the wave shape of the oscillations in the circuit.
  • the delay element comprises a meandering electrically conductive element.
  • the meandering electrically conductive element comprises between two and twelve meandering branches, preferably between three and ten meandering branches, more preferably three meandering branches.
  • the meandering electrically conductive element comprises one of an omega-shaped coil, a single planar coil, a flat inductor, a wavy line, a zig-zag line, or a sawtooth line.
  • 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 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. In some examples, the oscillation circuit is configured such that, during operation, the peak AC voltage across the two electrical contacts is greater than five times the supply voltage of the oscillation circuit.
  • providing a higher voltage across the load capacitor than the supply voltage enables more power to be delivered to an aerosol-forming substrate with lower switching losses in the switching unit, and therefore directly impacts the efficiency of the aerosolgenerating device. In examples of the present disclosure, this may be achieved without the use of any voltage transformers by relying solely on resonant oscillating operation within the feedback loop.
  • the feedback loop is connected across an output terminal and a biasing terminal of the switching unit.
  • the output terminal of the switching unit is coupled to the supply voltage via a radio frequency choke.
  • the choke acts to block high frequency alternating currents while passing direct current and low frequency alternating current.
  • the oscillation circuit further comprises a capacitor connected between an output terminal of the switching unit and ground, the capacitor having a capacitance value that is bigger than a maximal intrinsic capacitance of the switching unit. This reduces the influence of the variation of the intrinsic properties of the switching unit due to factors such as temperature and operating frequency on the operation of the feedback loop.
  • the electrode arrangement may comprise a first electrode and a second electrode each comprising a cylindrical segment configured to interdigitate with a cylindrical segment of the other electrode around a cylindrical axis.
  • the first electrode comprises a first plurality of cylindrical segments and the second electrode comprises a second plurality of cylindrical segments, wherein each of the first plurality of cylindrical segments are positioned around the cylindrical axis separated by one of the second plurality of cylindrical segments.
  • the first electrode comprises a first plurality of axially aligned electrode rings and the second electrode comprises a second plurality of axially aligned electrode rings, wherein each of the first plurality of electrode rings are separated by one of the second plurality of electrode rings.
  • the first electrode comprises a first plurality of electrode rods or pins and the second electrode comprises a second plurality of electrode rods or pins, wherein each of the first plurality of electrode rods or pins and second plurality of electrode rods or pins are alternately positioned in a grid to form an electrode array.
  • Such examples may create a highly uniform electric field through an aerosol-forming substrate, and may be particularly suited to dielectrically heating a liquid aerosol-forming substrate in a reservoir.
  • the density of the electrode array may provide a wicking effect on a liquid aerosol-forming substrate to draw more liquid aerosolforming substrate from the reservoir into the electrode array as the aerosol is generated.
  • the use of coaxially aligned electrodes may provide more a more uniform electric field, and therefore more uniform dielectric heating through an aerosol-forming substrate situated within the electrode arrangement.
  • the first electrode comprises a tubular body having a hollow center and the second electrode comprises a rod or pin situated within the hollow center of the first electrode.
  • an article comprising an aerosol-forming substrate may be inserted into the electrode arrangement between the first and second electrode.
  • the tubular body of the first electrode may comprise one or more openings. The one or more openings may enable the aerosol generated by the dielectric heating to escape the electrode arrangement to an airflow channel.
  • the first electrode comprises a tubular body having a hollow center and the second electrode comprises a tubular body having a hollow center, wherein the second electrode is situated within the hollow center of the first electrode.
  • the tubular body of the second electrode comprises one or more openings. Such examples enable the inner electrode to define a central airflow passage for the generated aerosol to escape the electrode arrangement.
  • the first electrode comprises a plurality of axially aligned electrode rings and the second electrode comprises a rod or pin extending through the plurality of axially aligned electrode rings.
  • gaps between the electrode rings may enable aerosol to escape from the electrode arrangement to an airflow channel.
  • the oscillation circuit further comprises one of a variable capacitor, a variable inductor, a voltage regulator, a transistor voltage biasing element.
  • the aerosol-generating device further comprises an E-field sensor configured to measure the strength of an E-field in the vicinity of the aerosol-forming substrate.
  • the oscillation circuit comprises a first and second inductor sharing a mutual inductive coupling
  • the aerosol-generating device may further comprise an H-field sensor configure to measure the strength of a magnetic field in the vicinity of the first and second inductors.
  • 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 carrier material may not be a low-dielectric material but may comprise a flex PCB configured to be wrapped around a heating chamber that is formed of a rigid, low-dielectric, high-temperature resistant, non-conductive material.
  • This utilizes cost-effective PCB as the carrier material that can be wrapped around an element that forms the heating chamber, to thereby isolate the PCB from the heating chamber.
  • the PCB may be attached to the heating chamber by an adhesive, for example a scotch tape around the PCB. To reduce the amount of PCB substrate material that can be dielectrically heated, sections between the first and second electrodes can be cut out to form openings.
  • both the carrier material and the heating chamber may be formed of a low-dielectric material.
  • Providing dielectric heating circuit components on a low dielectric carrier material may facilitate simple large scale manufacturing of dielectric heating circuits for dielectric heating aerosolgenerating devices.
  • the one or more conductive layers may have a thickness in a range between 5 mm to 100 mm, more preferably between 12 mm to 70 mm, more preferably between 18mm to 35mm, more preferably about 35 mm.
  • a track or trace width for the conductor layers that form the first inductor and the electrical interconnections is preferably in a range between 0.5 mm to 8 mm, more preferably 1 .5 mm to 6 mm.
  • the low dielectric constant carrier material may comprise one or more of polyimide, PET (Polyethylene terephthalate), FR4, Polytetrafluoroethylene (PTFE), or liquid crystal polymers (LCP).
  • the low dielectric constant carrier material may have a thickness in a range between 5 mm to 150 mm, and preferably about 25mm, 35mm, or 50mm, and for example 30 mm for the outer cover layers.
  • the width of the planar extension of the rolled heating circuit can be in a range between 18.85 mm to 44 mm plus about 5 mm to 10 mm, for example to provide for an overlapping strip that can be used for bonding of the tubular ends to a cylindrically-shaped heater.
  • the first and second electrodes may have a length such that they fully or partially cover a length of the low dielectric constant carrier material, for example a length along the insertion direction, for example in a range between 5 mm to 30mm.
  • the first electrode and the second electrode each comprise cylindrical segments that are configured to oppose each other around a cylindrical axis when the flexible-low dielectric constant substrate is bent or rolled.
  • the first electrode comprises a hollow center with an inner diameter, and a second electrode having an outer diameter smaller than the inner diameter of the first electrode such that the second electrode can fit within the hollow center of the first electrode when the flexible-low dielectric substrate is bent or rolled.
  • the first electrode and the second electrode are configured to interdigitate together as the flexible low-dielectric constant substrate is bent or rolled.
  • 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 flexible low-dielectric constant substrate comprises an insulating layer located between the heating zone and the conductive layer that forms one or more of the first and second electrodes.
  • the insulating layer may provide for an electric insulation of the first or second electrodes to prevent electric shocks and dielectric breakdown, and also protection of the heating zone to avoid contact of the aerosol-forming article with the first and second electrodes.
  • the insulating layer may have a low dielectric constant value to avoid dielectric heating losses in the insulating layer.
  • the insulating layer should be designed to be thick enough to provide for sufficient electrical field strength and voltage breakdown, thin enough to avoid too much material being parasitically heated, and have a low dielectric constant at the intended operation frequency of the dielectric heating aerosol-generating device.
  • the dielectric constant of the insulation layer is below 3.2 at the operation frequency of the dielectric heating aerosol-generating device, more preferably below 3.
  • the insulation layer may have a thickness in a range between 25 mm to 70 mm.
  • the overall thickness of the heating circuit is less than 500 mm, more preferably less than 400 mm.
  • the region of the low-dielectric constant carrier material the one or more inductors may be stiffened, for example with an additional stiffening layer, to form a rigid or semirigid PCB structure.
  • the section of the low-dielectric constant carrier material comprising the first and second electrodes may be formed to be more flexible than the section comprising the first inductor.
  • the low-dielectric constant carrier material comprises a quartz body.
  • the quartz body may comprise a hollowed out portion defining the cavity for receiving an aerosol-forming substrate between the first electrode and the second electrode for dielectric heating.
  • the low-dielectric carrier material comprises an optical measurement device for measuring aerosol diffusion for puff detection.
  • a quartz carrier material may provide a transparent protective layer for an optical measurement device.
  • the optical measurement device may comprise an optical emitter or light source and an optical receiver or photo-sensitive device.
  • walls of the quartz carrier material may include optical channels with a different refractive index than the quartz to act as waveguides or lightguides.
  • the waveguides may be embedded into the quartz carrier material, for example as channels, conduits, or holes, and can be filled with a transparent material having a different refractive index to the quartz.
  • the light guides can be used to guide light towards and away cavity for illumination or measurement purposes.
  • the low-dielectric constant carrier material may comprise a material that has a low-dielectric constant (low relative permittivity), high-temperature resistivity (about 400°C), electrically non-conductive properties, and preferably is also food-grade microwave-safe, for example a plastic, ceramic, or glass.
  • a portion of the low-dielectric constant carrier material comprising the first and second electrodes may be structurally shaped to form a space or cavity that can be used as a heating chamber.
  • the dielectric heating element, for example electrode pairs forming the load capacitor, and/or the inductor can be placed on a surface or embedded inside the low-dielectric constant carrier material.
  • the low-dielectric constant carrier material may be a relatively soft, bendable material, for example a thin layer (e.g. less than 200pm) of low- dielectric (e.g. low relative permittivity) high-temperature resistant polymer, for example polyimide such as Kapton, for example PEI (Polyetherimide), more preferably PEEK (Polyether Ether Ketone) to thereby allow to bendably, foldably, or rollably form a heating chamber.
  • polyimide such as Kapton
  • PEI Polyetherimide
  • PEEK Polyether Ether Ketone
  • the low-dielectric constant carrier material comprises low-dielectric microwave ceramics that can form a heating chamber and at the same time can be used as a substrate for the first and second electrodes and the inductor.
  • the low-dielectric constant carrier material comprises one or more temperature sensors for measuring thermal radiation.
  • the one or more temperature sensors may comprise one or more temperature sensing tracks made from a material having a temperature dependent resistance configured to measure a temperature inside or adjacent to the load capacitor formed by the first and second electrodes.
  • RTD resistance temperature detector
  • the conductor tracks may be formed based on known printing techniques (e.g. flex PCB manufacturing techniques).
  • 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 above described low-dielectric constant carrier materials may further comprise a second inductor electrically interconnected to the second electrode.
  • the second inductor may be configured to form a mutual inductive coupling with the first inductor.
  • the second inductor may be provided on an opposite side of the low-dielectric constant carrier material to the first inductor.
  • the low-dielectric constant carrier material may comprise a magnetic core extending through low-dielectric constant carrier material through the first and second inductors to facilitate a stronger mutual inductive coupling.
  • the first and second inductor may comprise any of the features described above in relation to inductors.
  • An aerosol-generating device for dielectrically heating an aerosol-forming substrate, the device comprising an oscillation circuit.
  • the oscillation circuit comprises: a switching unit; and a feedback loop connected to the switching unit, the feedback loop comprising two electrical contacts configured to interconnect with an electrode arrangement that forms a load capacitor for dielectrically heating the aerosol-forming substrate.
  • Ex 5 The aerosol-generating device according to Ex2, wherein the switching unit is configured for inverting operation, wherein the feedback loop is configured to perform resonant oscillating operation and configured to provide a 180° phase shift between an output signal of the switching unit and an input switching signal of the switching unit.
  • Ex 6. The aerosol-generating device according to any of Ex2 to Ex5, wherein the feedback loop comprises a capacitive element providing for a 90 degrees phase shift to a signal from the feedback loop.
  • Ex 7 The aerosol-generating device according to Ex6, wherein the capacitive element comprises a capacitor connected to ground.
  • 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 9 The aerosol-generating device according to any of Ex2 to Ex8, wherein the feedback loop comprises a resonant circuit comprising the two electrical contacts, the resonant circuit providing for a 90 degrees phase shift circuit at an operating frequency of the oscillation circuit.
  • Ex 10 The aerosol-generating device according to Ex9, wherein the resonant circuit comprises one of a parallel resonant circuit, a series resonant circuit, or a combination thereof.
  • Ex 12 The aerosol-generating device according to Ex11 , wherein the output signal of the switching unit is a switched voltage across a transistor.
  • Ex 20 The aerosol-generating device according to any of Ex2 to Ex19, wherein the feedback loop does not comprise a voltage transformer.
  • Ex 23 The aerosol-generating device according to any of Ex2 to Ex22, further comprising a capacitor connected between an output terminal of the switching unit and ground, the capacitor having a capacitance value that is bigger than an intrinsic capacitance of the switching unit.
  • Ex 25 The aerosol-generating device according to Ex24, wherein the oscillation circuit is configured such that, during operation, the peak AC voltage across the two electrical contacts is greater than five times the supply voltage of the oscillation circuit.
  • Ex 26 The aerosol-generating device according to any of Ex2 to Ex25, wherein the oscillation circuit further comprises a delay element configured to impede a switching speed of the switching unit.
  • Ex 31 The aerosol-generating device according to any of Ex26 to Ex30, wherein the delay element comprises a low-pass filter.
  • Ex 32 The aerosol-generating device according to any of Ex26 to Ex30, wherein the delay element comprises a meandering electrically conductive element.
  • Ex 33 The aerosol-generating device according to Ex32, wherein the meandering electrically conductive element comprises between two and twelve meandering branches, preferably between three and ten meandering branches, more preferably three meandering branches.
  • Ex 34 The aerosol-generating device according to any of Ex32 or Ex33, wherein the meandering electrically conductive element comprises one of an omega-shaped coil, a single planar coil, a flat inductor, a wavy line, a zig-zag line, or a sawtooth line.
  • the feedback loop comprises a first inductor connected in series with one of the two electrical contacts.
  • Ex 36 The aerosol-generating device according to Ex35, wherein the first inductor comprises no more than five turns.
  • Ex 38 The aerosol-generating device according to any Ex37, wherein the first inductor comprises no more than one turns.
  • Ex 39 The aerosol-generating device according to any of Ex35 to Ex38, wherein the feedback loop further comprises a second inductor, wherein the two electrical contacts are connected in series between the first inductor and the second inductor.
  • Ex 40 The aerosol-generating device according to Ex39, wherein the second inductor comprises the same number of turns as the first inductor.
  • 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 42 The aerosol-generating device according to any of Ex39 to Ex41 , wherein the first inductor and the second inductor are formed as planar inductors.
  • Ex 43 The aerosol-generating device according to any of Ex39 to Ex41 , wherein a coil axis of the first inductor is arranged to coaxially align with a coil axis of the second inductor.
  • Ex 44 The aerosol-generating device according to any of Ex39 to Ex43, wherein the feedback loop is configured such that a mutual inductive coupling is formed between the first inductor and the second inductor.
  • Ex 45 The aerosol-generating device according to Ex44, wherein the mutual inductive coupling is between 40% and 70%, and optionally between 50% and 60%.
  • Ex 46 The aerosol-generating device according to any of Ex44 to Ex45, wherein the mutual inductive coupling between the first inductor and the second inductor is achieved without a magnetic core.
  • Ex 47 The aerosol-generating device according to any of Ex44 to Ex45, further comprising a magnetic core extending through the first inductor and the second inductor to provide the mutual inductive coupling.
  • 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 50 The aerosol-generating device according to any of Ex2 to Ex48, further comprising 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.
  • Ex 51 The aerosol-generating device according to Ex49 or Ex50, wherein the electrode arrangement comprises a first electrode coaxially aligned with a second electrode.
  • Ex 52 The aerosol-generating device according to Ex51 , wherein the first electrode comprises a tubular body having hollow center and the second electrode comprises a rod or pin situated within the hollow center of the first electrode.
  • Ex 56 The aerosol-generating device according to any of Ex51 to Ex53, wherein the first electrode comprises a plurality of axially aligned electrode rings and the second electrode comprises a rod or pin extending through the plurality of axially aligned electrode rings.
  • Ex 60 The aerosol-generating device according to Ex59, wherein the electrode arrangement forms a flat plate.
  • 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 62 The aerosol-generating device according to any of Ex59 to Ex61 , wherein the first electrode and the second electrode each comprise a cylindrical segment configured to interdigitate with the cylindrical segment of the other electrode around a cylindrical axis.
  • Ex 63 The aerosol-generating device according to Ex62, wherein the first electrode comprises a first plurality of cylindrical segments and the second electrode comprises a second plurality of cylindrical segments, wherein each of the first plurality of cylindrical segments are positioned around the cylindrical axis separated by one of the second plurality of cylindrical segments.
  • Ex 64 The aerosol-generating device according to Ex63, wherein the device is configured to independently energize one or more of the first plurality cylindrical segments for providing sectional dielectric heating.
  • Ex 66 The aerosol-generating device according to any of Ex59 to Ex61 , wherein the first electrode comprises a first plurality of axially aligned electrode rings and the second electrode comprises a second plurality of axially aligned electrode rings, wherein each of the first plurality of electrode rings are separated by one of the second plurality of electrode rings.
  • 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.
  • 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.
  • a method of manufacturing a dielectric heater for an aerosol-generating device comprising: providing a first electrode configured to form a part of a load capacitor C1 on a flexible low- dielectric substrate; providing a second electrode configured to form another part of the load capacitor C1 on the low- dielectric substrate; electrically coupling a planar inductor L1 to the first electrode; and bending or rolling the low-dielectric substrate such that the first electrode and the second electrode at least partially face each other.
  • any of all the features of the above described oscillation circuit may be provided on a single low dielectric constant carrier material.
  • Figure 1 is a schematic illustration of a dielectric heating aerosol-generating system according to embodiments of the disclosure
  • FIG 2 is a schematic illustration of an oscillation circuit for use in the dielectric heating aerosol-generating system of Figure 1 , according to embodiments of the disclosure;
  • Figure 3a is a schematic illustration of an oscillation circuit showing two different phaseshifting elements, one exemplarily implemented as a resonance circuit, one exemplarily implemented as a capacitive element, to achieve a 180 degrees phase shift;
  • Figure 3b 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 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
  • Figures 7A-C are isometric illustrations of inductor pairs sharing a mutual inductive coupling for use in the oscillation circuit of Figures 2 to 4, according to embodiments of the disclosure;
  • Figures 8A-D are isometric and schematic illustrations of flat interdigitated electrode arrangements for use in the oscillation circuit of Figures 2 to 4, according to embodiments of the disclosure;
  • Figure 9 shows an isometric and schematic illustrations of tubular interdigitated electrode arrangements for use in the oscillation circuit of Figures 2 to 4 configured to dielectrically heat an aerosol-forming substrate 110, according to embodiments of the disclosure;
  • Figure 10 shows a schematic illustrations of an interdigitated electrode arrangement with a varying electrode separation distance, according to embodiments of the disclosure
  • FIGS 11 A-D show isometric and schematic illustrations of tubular interdigitated electrode arrangements for use in the oscillation circuit of Figures 2 to 4 configured to dielectrically heat an aerosol-forming substrate 110;
  • Figure 12A-D are schematic illustrations of an electrode arrangement having variable polarity control, 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 15 is a schematic illustration of an electrode arrangement and inductor formed on a low dielectric flexible substrate, according to embodiments of the disclosure.
  • Figure 16A-C are a schematic illustrations of an electrode arrangement and two inductively coupled inductors formed on a low dielectric flexible substrate, according to embodiments of the disclosure.
  • Figure 17 is a schematic illustration of an electrode arrangement and two inductively coupled inductors formed on a quartz glass substrate, according to embodiments of the disclosure.
  • Figure 18 is a schematic illustration of a temperature sensing system for detecting a temperature of an aerosol-forming substrate situated with the electrode arrangement, according to embodiments of the disclosure
  • Figure 19 is a schematic illustration of an alternative temperature sensing system for detecting a temperature of an aerosol-forming substrate situated with the electrode arrangement, according to embodiments of the disclosure.
  • Figure 20 is a schematic illustration of a control system utilizing a temperature sensing system for control the power delivered to an aerosol-forming substrate based on a detected aerosolforming substrate temperature;
  • 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.
  • first electrode 130 and the second electrode 135 may form part of the article 105 comprising the aerosol-forming substrate 1 10.
  • a cavity between the first and second electrical contacts 160, 165 is sized such that, when the aerosol-forming article 105 is housed within the cavity 140, an electrical connection is made between the first electrode 130 and the first electrical contact 160, and the second electrode 135 and the second electrical contact 165.
  • 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.
  • FIGS 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. a single loop coil.
  • the winding central axis of each coil substantially coincides with each other, and the plane formed by each single-winding inductor is parallel to the other, and is also in close proximity. This establishes a mutual inductance between inductors Li and L 2 without a magnetic core M c .
  • 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 electrode arrangement of Figure 7C comprises parallelly arranged electrode plates Ei and E 2 having curved edges to reduce hotspots in the electric field formed around the boundaries of the electrode plates.
  • FIGS. 7A and 7B illustrate electrode arrangements comprising a pair of electrode plates 130, 135 aligned in parallel, however other electrode arrangements are also possible.
  • Figures 8B and 8C show electrode arrangements comprising a plurality of electrodes for each polarity wherein each electrode is positioned adjacent to electrodes of the opposite polarity.
  • edges and corners of the electrodes may vary however, it is preferable that the edges and corners of the electrodes are rounded, e.g. having a radius in range of about 0.15 mm to 2.5 mm, to “soften” the peaks of the electric field at the edges and corners.
  • FIG. 8D it is possible to make an interdigitated electrode arrangement for one- side flat aerosol-forming substrate 110.
  • dielectric heating may be improved by providing a second electrode arrangement identical to the electrode arrangement shown in Figure 8D on an opposite side of the aerosol-forming substrate 1 10.
  • the electrodes of the second electrode arrangement can be configured to align with electrodes of the first electrode arrangement having an opposite polarity.
  • 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.
  • Figure 10 illustrates an embodiment in which the distance between electrodes of opposite polarity varies across different regions of the electrode arrangement. This may be advantageous to modify the strength of the electric field in different regions of the electrode arrangement, thereby modifying the heating power delivered to different regions of an aerosol-forming substrate 110 heated using the electrode arrangement, to provide for sectional, zoned or partial heating.
  • 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 12A-D are schematic illustrations of an electrode arrangement having variable polarity control, according to embodiments of the disclosure. By the use of an analog signal demultiplexer or analog signal switch or an equivalent circuit, it is possible to selectively connect one or more pairs of electrodes to an oscillating feedback loop to deliver sectional heating to the load capacitor CL.
  • adjacent electrodes can be switched to have the same polarity, or opposing electrodes can be switched and reconfigured to the same polarity.
  • This enables an oscillation circuit to switch between different electric field distribution patterns between the electrodes to adjust the heating profile across the aerosol-forming substrate 1 10.
  • the electrodes form cylindrical segments that can be arranged around a cylindrically-shaped cavity for different electric-field patterns. This principle also works for other numbers of electrode pairs, e.g. two (2) pairs, three (3) pairs, or four (4) pairs, etc., and for sectional, zoned, or partial heating of areas or volumes of an aerosol-forming substrate 1 10.
  • the analog signal switch or analog signal demultiplexer can be implemented electronically, mechanically, or electro- mechanically.
  • a semiconductor-based or solid state switch or demultiplexer can be based on JFET switches or a bilateral parallelly-arranged CMOS switch, combining PMOS and NMOS.
  • An electromechanical based switch or demultiplexer can be based on a microelectromechanical systems (MEMS), for example using a RF MEMS switching technology, and a mechanical switch or demultiplexer can be based on relays, for example RF micro-relays.
  • MEMS microelectromechanical systems
  • a mechanical switch or demultiplexer can be based on relays, for example RF micro-relays.
  • more than one oscillation circuit may be used.
  • a separate oscillation circuit may be provided for each pair of electrodes in the electrode arrangement.
  • 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.
  • an aerosol-forming article 105 comprising an aerosol-forming substrate 1 10 may form a hollow cylinder, having an interior hollow cylindrical volume.
  • This aerosolforming article geometry may be beneficial since lower dielectric losses occur at areas that are located farther away from two electrode plates Ei and E 2 having opposite polarity.
  • the inner hollow cylinder can have a diameter of that is in a range between 20% and 80% less that the outer diameter of the aerosol-forming article 105, more preferably in a range between 25% and 60% less that the outer diameter of the aerosol-forming article 105, even more preferably between 25% and 45% less that the outer diameter of the aerosol-forming article 105.
  • the inner core of the cylindrical aerosol-forming article 105 may be filled with an aerosol-forming material or a filler material that has a higher dielectric constant than the aerosol-forming material of the outer cylinder portion.
  • the inner core of the aerosol-forming article 105 could have a higher content of an aerosol-forming carrier liquid, such as glycerol or polypropene glycol (PPG), having high dielectric constants.
  • PPG polypropene glycol
  • 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.
  • 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.
  • Figure 14 shows isometric illustrations of coaxial electrode arrangements for use in the oscillation circuit of Figures 2 and 3, according to embodiments of the disclosure.

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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) comprenant une unité de commutation et une boucle de rétroaction connectée aux bornes de l'unité de commutation. La boucle de rétroaction comprend une première bobine d'induction L1 n'ayant pas plus de deux spires connectées en série avec l'un de deux contacts électriques (160, 165) conçus pour s'interconnecter avec un agencement d'électrode qui forme un condensateur de charge CL afin de chauffer diélectriquement le substrat de formation d'aérosol (110).
PCT/EP2024/078165 2023-10-05 2024-10-07 Dispositif de génération d'aérosol à chauffage diélectrique ayant un inducteur à faible enroulement Pending WO2025074007A1 (fr)

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EP23201977.8 2023-10-05
EP23201977 2023-10-05

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PCT/EP2024/078165 Pending WO2025074007A1 (fr) 2023-10-05 2024-10-07 Dispositif de génération d'aérosol à chauffage diélectrique ayant un inducteur à faible enroulement

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3413731B1 (fr) * 2016-02-23 2021-04-07 Fontem Holdings 1 B.V. Générateur d'aérosol à polarisation haute fréquence
WO2022175287A1 (fr) * 2021-02-16 2022-08-25 Philip Morris Products S.A. Système de génération d'aérosol à élément chauffant diélectrique
WO2022184783A1 (fr) * 2021-03-02 2022-09-09 Philip Morris Products S.A. Système de génération d'aérosol chauffé diélectriquement à dimensions optimisées

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3413731B1 (fr) * 2016-02-23 2021-04-07 Fontem Holdings 1 B.V. Générateur d'aérosol à polarisation haute fréquence
WO2022175287A1 (fr) * 2021-02-16 2022-08-25 Philip Morris Products S.A. Système de génération d'aérosol à élément chauffant diélectrique
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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