Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
  • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
  • A24F40/50—Control or monitoring
  • A24F40/57—Temperature control
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
  • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
  • A24F40/10—Devices using liquid inhalable precursors
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
  • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
  • A24F40/20—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
  • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
  • A24F40/46—Shape or structure of electric heating means
  • A24F40/465—Shape or structure of electric heating means specially adapted for induction heating
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
  • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
  • A24F40/50—Control or monitoring
  • A24F40/51—Arrangement of sensors
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
  • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
  • A24F40/50—Control or monitoring
  • A24F40/53—Monitoring, e.g. fault detection
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D23/00—Control of temperature
  • G05D23/19—Control of temperature characterised by the use of electric means
  • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
  • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
  • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
• • H—ELECTRICITY
  • 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
  • H05B6/02—Induction heating
  • H05B6/06—Control, e.g. of temperature, of power
• • 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
  • H05B6/02—Induction heating
  • H05B6/36—Coil arrangements

Definitions

• Some aerosol-generating devices are configured to perform two sequential usage sessions. Such aerosol-generating devices can be configured to perform a second usage session immediately following the end of a first usage session.
• the aerosol-forming substrate may be depleted after a single usage session. In such cases, the aerosol-generating article should be replaced between a first usage session and a second, sequential, usage session.
• the risk of a user attempting to re-use a depleted aerosol-forming substrate may be a particular problem in the context of such devices. It would be desirable to provide an aerosol-generating device that is capable of detecting when a depleted aerosol-generating article is used with the aerosol-generating device.
• the controller may be configured to control the power supply to operate in the low power mode initially.
• the controller may be configured to switch from the low power mode to the high power mode only if the measured parameter satisfies a predetermined criterion.
• the length of the interval between successive pulses may be between 25 milliseconds and 500 milliseconds, preferably between 50 milliseconds and 300 milliseconds, even more preferably about 250 milliseconds.
• the controller may be configured to supply the oscillating current such that a relatively low power is supplied to the susceptor element. In this way, minimal heat may be generated by the susceptor element of the aerosol-generating article and an aerosol may not be generated.
• the controller may be configured to supply the oscillating current such that a relatively high power is supplied to the susceptor element.
• the oscillating current such that a relatively high power is supplied to the susceptor element.
• enough heat may be generated by the susceptor element of the aerosol-generating article to generate an aerosol.
• the heat generated in the susceptor element may be transferred, for example by conduction, to an aerosol-forming substrate of the aerosolgenerating article to generate an aerosol.
• the predetermined criterion may comprise the rate of change of the conductance of the susceptor element being less than the first predetermined threshold. This may be the case, for example, if the predetermined criterion relates to an expected rate of change of the temperature of the susceptor element when a fresh aerosol-generating article is received in the cavity of an aerosol-generating device that has not recently been used. This may be because the temperature of a fresh aerosol-generating article should be similar to the temperature of the heater assembly and so there should be a very minimal heating or cooling of a fresh aerosol-generating article.
• the controller being configured to measure the rate of change of conductance of the susceptor element comprises the controller measuring a parameter related to a rate of change of a temperature of an aerosol-generating article received in the cavity.
• the controller being configured to measure the rate of change of conductance of the susceptor element comprises the controller measuring a parameter related to a rate of change of a temperature of the heater assembly.
• the power supply may comprise a DC power supply such as a battery.
• the electrically resistive material may optionally be embedded in, encapsulated or coated with an insulating material or vice-versa, depending on the kinetics of energy transfer and the external physicochemical properties required.
• the heating element may comprise a metallic etched foil insulated between two layers of an inert material.
• the inert material may comprise Kapton®, all-polyimide or mica foil. Kapton® is a registered trade mark of E.l. du Pont de Nemours and Company.
• the parameter measured by the controller may be the rate of change of the conductance of the susceptor element or the rate of change of the resistance of the susceptor element.
• the step of operating the heater assembly in the low power mode may occur immediately following the step of activating the device or detecting that an aerosol-generating article has been received in the device.
• EX15 An aerosol-generating device according to any one of the preceding examples, wherein, in the low power mode, the controller is configured to control the power supply to supply a current with a duty cycle of less than 2 %, preferably less than 1 %, preferably less than 0.4 %, preferably less than 0.2 %, preferably less than 0.15%, even more preferably less than 0.1 %.
• EX30 An aerosol-generating device according to any one of examples EX27 to EX29, wherein the heater element is in the form of a blade.
• the power is supplied as a direct current.
• the controller is configured to supply power to heater assembly so that the heater assembly is operated in a low power mode. In the low power mode, substantial heating of the heater blade 402 is avoided. This is achieved by supplying power to the heater blade 402 as a series of successive pulses separated by time intervals. The pulses have length of about 1 millisecond and are separated by time intervals of about 250 milliseconds. During the time intervals, the power supplied to the heater blade 402 is interrupted. As the pulses are much shorter than the intervals between pulses, the temperature of the heater blade 402 will not substantially increase in the low power mode and so substantial generation of aerosol in the low power mode is avoided.
• Step 604 is performed during step 602.
• Step 604 of the method comprises determining the rate of change of the resistance of the heater blade 402.
• Heater blade 402 is made of a material having a resistance that is dependent on temperature. As such, determining the rate of change of the resistance of the heater blade 402 provides a proxy for the rate of change of the temperature of the heater blade 402.
• the controller is able to determine that the second aerosol-generating device 400 has not recently been used.
• the predetermined threshold for the rate of change of resistance that controller is configured to use in step 606 of the method corresponds to a maximum expected rate of change of the resistance of the heater blade if a fresh aerosol-generating article 200 is received in the cavity 10 and if the heater blade 402 has not recently been heated.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Resistance Heating (AREA)
• Control Of Resistance Heating (AREA)

Priority Applications (5)

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Publications (1)

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Citations (4)

• 2023
  • 2023-01-30 US US18/832,020 patent/US20250089809A1/en active Pending
  • 2023-01-30 CN CN202380018258.1A patent/CN118591313A/zh active Pending
  • 2023-01-30 WO PCT/EP2023/052189 patent/WO2023144389A1/en not_active Ceased
  • 2023-01-30 JP JP2024543915A patent/JP2025504527A/ja active Pending
  • 2023-01-30 KR KR1020247028494A patent/KR20240138557A/ko active Pending
  • 2023-01-30 EP EP23702025.0A patent/EP4472454B1/en active Active

Patent Citations (4)

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