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EP-3939382-B1 - AEROSOL GENERATING DEVICE

EP3939382B1EP 3939382 B1EP3939382 B1EP 3939382B1EP-3939382-B1

Inventors

  • BLANDINO, THOMAS PAUL
  • SAYED, Ashley John
  • WARREN, Luke James

Dates

Publication Date
20260506
Application Date
20200309

Claims (17)

  1. An aerosol generating device (100) comprising: an induction heating circuit comprising an inductive element, the inductive element is configured to generate a varying magnetic field for inductively heating a susceptor arrangement (132) to heat an aerosol generating material to thereby generate an aerosol; wherein the device comprises a magnetic shield member (202) configured to surround the inductive heating element; characterised in that the device is configured such that during operation a level of electromagnetic radiation emitted by the device is: less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz, wherein the magnetic shield member is at least partially bonded to itself.
  2. An aerosol generating device according to claim 1 wherein the device is configured such that during operation the level of electromagnetic radiation emitted due to the operation of the device is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and less than 47dBµV/m over a frequency range of 23 5MHz to 1GHz.
  3. An aerosol generating device according to any preceding claim wherein the device is configured such that during operation to charge the device and/or during operation to discharge the device the level of electromagnetic radiation emitted due to the operation of the device is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz.
  4. An aerosol generating device according to any preceding claim wherein the level of radiation emitted by the device is a level of emitted radiation as measured in both a vertical plane and in a horizontal plane and/or wherein the level of electromagnetic radiation emitted by the device is a level of electromagnetic radiation as measured using a testing setup for measuring levels of emitted electromagnetic radiation, wherein optionally, the level of emitted radiation emitted by the device is a level determined by measuring peak or quasi-peak levels of radiation emitted by the device.
  5. An aerosol generating device according to any preceding claim wherein the device comprises the susceptor arrangement (132) and during operation the aerosol generating material is received by the device such that the susceptor arrangement is arranged to heat the aerosol generating material.
  6. An aerosol generating device according to any preceding claim wherein: the device is a tobacco heating device configured to during operation heat but not burn tobacco material to generate an aerosol therefrom; and/or the device is a handheld device.
  7. An aerosol generating device according to any preceding claim wherein the device comprises a receptacle configured to receive during operation the aerosol generating material to be heated by the susceptor arrangement, and wherein the inductive element is an inductor coil extending around the receptacle, wherein the receptacle is optionally defined by the susceptor arrangement.
  8. An aerosol generating device according to any preceding claim comprising a charging apparatus configured to control charging of a battery of the device from a power source external to the device, wherein the charging apparatus is configured such that, when operating to manage charging of the device, peak levels in electromagnetic radiation emitted by the device due to operation of the charging apparatus are less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz.
  9. An aerosol generating device according to claim 8 wherein the charging apparatus is configured to perform switching operations during charging, and wherein the charging apparatus comprises a snubber circuit for limiting a rate of change of voltage during the switching operations of the charging apparatus.
  10. An aerosol generating device according to claim 9 wherein the charging apparatus comprises: an input section configured for connecting to the external power source to receive power therefrom to charge the device; an output section connected to an output inductor; and a charge management controller, connected between the input section and the output section and configured to receive power from the input section and control the current supplied to the output section, wherein the snubber circuit is optionally located in the output section of the charging apparatus and/or the input section of the charging apparatus optionally comprises an input inductor for filtering high frequency signals reaching the charge management controller.
  11. An aerosol generating device according to any preceding claim wherein the device is configured such that during operation to heat an aerosolisable material: a level of electromagnetic radiation emitted by the device over a frequency range of 30MHz to 1GHz is less than around 35dBµV/m; and/or a level of electromagnetic radiation emitted by the device over a frequency range of 30MHz to 400MHz is less than around 20dBµV/m.
  12. An aerosol generating device according to any preceding claim wherein the device is configured such that during operation to charge the device: a level of electromagnetic radiation emitted by the device over a frequency range of 300MHz to 1GHz is less than around 37.5dBµV/m; and/or a level of electromagnetic radiation emitted by the device over a frequency range of 30MHz to 500MHz is less than around 35dBµV/m.
  13. An aerosol generating device according to any preceding claim wherein the device is configured such that an average emitted radiation level for the device during operation over a frequency range of 1GHz to 3GHz is less than around 50dBµV/m and/or an average emitted radiation level for the device during operation over a frequency range of 3GHz to 6GHz is less than around 54dBµV/m.
  14. A system comprising an aerosol generating device according to any preceding claim and a charging cable for providing charge from an external power source to charge the device, wherein the system is configured such that during operation to charge the device a level of electromagnetic radiation emitted by the system is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz.
  15. A system according to claim 14 wherein the system is configured such that during operation to charge the device a level of electromagnetic radiation emitted by the system over a frequency range of 300MHz to 1GHz is less than around 37.5dBµV/m.
  16. A system according to claim 14 or claim 15 wherein the system is configured such that during operation to charge the device a level of conducted electromagnetic emissions on the charging cable due to operation of the device is: less than around 66dBµV over a frequency range of 150kHz to 500kHz; and/or less than around 56dBµV at around 500kHz; and/or less than around 56dBµV over a frequency range of 500kHz to 5MHz; and/or less than around 60dBµV over a frequency range of 5MHz to 30MHz.
  17. An aerosol generating system comprising an aerosol generating device according to any of claims 1 to 13 and an article containing an aerosolisable material, wherein the system is configured such that during operation to generate an aerosol from the aerosolisable material a level of electromagnetic radiation emitted by the system is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz, and/or less than around 35dBµV/m over a frequency range of 30MHz to 500MHz, and/or less than around 20dBµV/m over a frequency range of 30MHz to 400MHz.

Description

Technical Field The present invention relates to an aerosol generating device. Background Smoking articles such as cigarettes, cigars and the like burn tobacco during use to create tobacco smoke. Attempts have been made to provide alternatives to these articles that burn tobacco by creating products that release compounds without burning. Examples of such products are heating devices which release compounds by heating, but not burning, the material. The material may be for example tobacco or other non-tobacco products, which may or may not contain nicotine. US 2017/079326 A1 discloses a device according to the preamble of claim 1. Summary According to a first aspect of the present disclosure there is provided an aerosol generating device comprising: an induction heating circuit comprising an inductive element, the inductive element is configured to generate a varying magnetic field for inductively heating a susceptor arrangement to heat an aerosol generating material to thereby generate an aerosol; wherein the device is configured such that during operation a level of electromagnetic radiation emitted by the device is: less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz, wherein the device comprises a magnetic shield member configured to surround the inductive heating element and the magnetic shield member is at least partially bonded to itself. The device may be configured such that during operation the level of electromagnetic radiation emitted due to the operation of the device is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and less than 47dBµV/m over a frequency range of 235MHz to 1GHz. The device may be configured such that during operation to charge the device and/or during operation to discharge the device the level of electromagnetic radiation emitted due to the operation of the device is less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz. The level of radiation emitted by the device may be a level of emitted radiation as measured in both a vertical plane and in a horizontal plane. The level of electromagnetic radiation emitted by the device may be a level of electromagnetic radiation as measured using a testing setup for measuring levels of emitted electromagnetic radiation, wherein optionally, the level of emitted radiation emitted by the device is a level determined by measuring peak or quasi-peak levels of radiation emitted by the device. The device may comprise the susceptor arrangement and during operation the aerosol generating material may be received by the device such that the susceptor arrangement is arranged to heat the aerosol generating material. The device may be a tobacco heating device configured to during operation heat but not burn tobacco material to generate an aerosol therefrom. The device may be a handheld device. The device comprises a magnetic shield member, the magnetic shield member may be configured to extend at least partially around the inductive heating circuit or the susceptor arrangement. The device may comprise a receptacle configured to receive during operation the aerosol generating material to be heated by the susceptor arrangement, and the inductive element may be an inductor coil extending around the receptacle. The receptacle may be defined by the susceptor arrangement. The device may comprise a charging apparatus configured to control charging of a battery of the device from a power source external to the device, and the charging apparatus may be configured such that, when operating to manage charging of the device, peak levels in electromagnetic radiation emitted by the device due to operation of the charging apparatus are less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/m over a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/m over a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/m over a frequency range of 3GHz to 6GHz. The charging apparatus may be configured to perform switching operations during charging, and the charging apparatus may comprise a snubber circuit for limiting a rate of change of voltage during the switching operations of the charging apparatus. The charging apparatus may comprise: an input section configured for connecting to the external power source to receive power therefrom to charge the device; an output section connected to an output inductor; and a charge management controller, connected between the input section and the output section and configured to receive power from the input section and control the current supplied to the output section. The