RU2808172C2 - Aerosol generation device - Google Patents

Abstract

FIELD: aerosol generation devices.

SUBSTANCE: aerosol generating device comprises an induction heating circuit for inductively heating a current receiving structure to heat an aerosol generating substance to thereby generate an aerosol; wherein the device is configured such that, during operation, the level of electromagnetic radiation emitted by the device is less than 40 dBmcV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBmcV/m in the frequency range from 235 MHz to 1 GHz, and /or less than 70 dBmcV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBmcV/m in the frequency range from 3 to 6 GHz, wherein the device contains a magnetic shield element configured to pass at least partially around induction heating circuits or current-collecting structures; wherein the magnetic shield element contains one or more recesses.

EFFECT: improved protection from incident electromagnetic radiation

28 cl, 17 dwg

Description

Field of technology to which the invention relates

The present invention relates to an aerosol generation device.

State of the art

Smoking products such as cigarettes, cigars, etc., burn tobacco to produce tobacco smoke during use. Attempts have been made to provide alternatives to such products that burn tobacco by creating products that release compounds without combustion. Examples of such products are heating devices that 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.

Disclosure of the invention

According to a first aspect of the present invention, there is provided an aerosol generating apparatus, comprising: an induction heating circuit for inductively heating a current receiving structure to heat an aerosol generating substance to thereby produce an aerosol; wherein the device is designed such that, during operation, the level of electromagnetic radiation emitted by the device is: less than 40 dBµV/m in the frequency range from 30 to 225 MHz and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and /or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz.

The device may be configured such that, during operation, the level of electromagnetic radiation emitted during operation of the device is less than 40 dBµV/m in the frequency range from 30 to 225 MHz and less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz.

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 operation of the device is less than 40 dBµV/m in the frequency range of 30 to 225 MHz, and/ or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz.

The level of radiation emitted by a device may be the level of emitted radiation measured in both the vertical and horizontal planes.

The level of electromagnetic radiation emitted by a device may be the level of electromagnetic radiation measured using a test apparatus for measuring levels of electromagnetic radiation emitted, wherein, optionally, the level of 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 include a susceptor structure and, during operation, an aerosol-generating substance may be inserted into the device such that the susceptor structure is configured to heat the aerosol-generating substance.

The device may be a tobacco heating device configured to heat, but not burn, the tobacco material to form an aerosol during operation.

The device may be a portable device.

The device may include a magnetic shield element configured to extend at least partially around the induction heating circuit or current collecting structure.

The induction heating circuit may include an inductive element configured to generate an alternating magnetic field to heat the current collector structure, and the magnetic shield element may be configured to extend at least partially around the inductive element.

The device may include a receptacle configured to be inserted into it during operation of an aerosol-generating substance to be heated by the current-receiving structure, and the inductive element may be an inductor extending around the receptacle.

The receiver may be formed by a current-receiving structure.

The magnetic shield element may surround the inductive element, and the magnetic shield element may be at least partially secured to itself.

The device may include a charger configured to control charging of a battery of the device from a power source external to the device, wherein the charger may be configured such that, while controlling charging of the device, peak levels of electromagnetic radiation emitted by the device due to operation of the charger are were less than 40 dBµV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz.

The charger may be configured to perform switching operations during charging, wherein the charger may include a snubber circuit to limit the rate of change of voltage during switching operations of the charger.

The charger may include: an input section configured to connect to an external power source to receive energy from it to charge the device; an output section connected to the output inductor; and a charging control controller connected between the input section and the output section and configured to receive power from the input section and control a current supplied to the output section.

The snubber circuit may be located in the output section of the charger.

The charger input section may include an input inductor to filter high frequency signals entering the charge control controller.

The device may be configured such that, during operation to heat the aerosolized substance, the level of electromagnetic radiation emitted by the device in the frequency range of 30 MHz to 1 GHz is less than about 35 dBμV/m.

The device may be configured such that, during operation to heat the aerosolized substance, the level of electromagnetic radiation emitted by the device in the frequency range of 30 to 400 MHz is less than about 20 dBμV/m.

The device may be configured such that, while the device is charging, the level of electromagnetic radiation emitted by the device in the frequency range of 300 MHz to 1 GHz is less than about 37.5 dBμV/m.

The device may be configured such that, while the device is charging, the level of electromagnetic radiation emitted by the device in the frequency range of 30 to 500 MHz is less than about 35 dBμV/m.

The device may be configured such that the average emitted radiation level for the device during operation in the frequency range from 1 to 3 GHz is less than about 50 dBμV/m and/or the average emitted radiation level for the device during operation in the frequency range from 3 to 6 GHz is less than 54 dBµV/m.

According to a second aspect of the present invention, there is provided a system comprising an aerosol generating device according to the first aspect and a charging cable for charging from an external power source for charging the device, wherein the system is configured such that while the device is charging, the level of electromagnetic radiation emitted by the system is less than 40 dBµV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and /or less than 74 dBµV/m in the frequency range from 3 to 6 GHz.

The system may be configured such that, during operation to charge the device, the level of electromagnetic radiation emitted by the system in the frequency range of 300 MHz to 1 GHz is less than about 37.5 dBμV/m.

The system may be configured such that, while the device is charging, the level of conducted electromagnetic emissions on the charging cable due to operation of the device is: less than about 66 dBμV in the frequency range 150 to 500 kHz; and/or less than about 56 dBµV at about 500 kHz; and/or less than about 56 dBµV in the frequency range from 500 kHz to 5 MHz; and/or less than about 60 dBµV in the frequency range from 5 to 30 MHz.

In accordance with a third aspect of the present invention, there is provided an aerosol generation system comprising an aerosol generation device in accordance with the first aspect and an article containing an aerosolizable substance, the system being configured such that during the generation of an aerosol from the aerosolizable substance of the device, the level of electromagnetic radiation emitted by the system is less than 40 dBµV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and /or 74 dBµV/m in the frequency range from 3 to 6 GHz.

The system may be configured such that, during generation of an aerosol from the aerosolized material, the level of electromagnetic radiation emitted by the system is less than about 35 dBμV/m in the frequency range from 30 to 500 MHz.

The system may be configured such that, during generation of an aerosol from the aerosolized material, the level of electromagnetic radiation emitted by the system in the frequency range of 30 to 400 MHz is less than about 20 dBμV/m.

Other features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, given by way of example with reference to the accompanying drawings.

Brief description of drawings

In fig. 1 is a schematic illustration of a setup for measuring levels of electromagnetic radiation emitted by an example of an aerosol generation system;

in fig. 2 – graph of measured levels of electromagnetic radiation from an example of an aerosol generation system during operation;

in fig. 3 – another graph of measured levels of electromagnetic radiation from an example of an aerosol generation system during operation;

in fig. 4 – front view of an example of an aerosol generation device;

in fig. 5 is a front view of the aerosol generating device shown in FIG. 4, with outer casing removed;

in fig. 6 is a sectional view of the aerosol generation device shown in FIG. 4;

in fig. 7 – aerosol generation device shown in Fig. 4, disassembled;

in fig. 8A is a cross-sectional view of the heating unit in the aerosol generation device;

in fig. 8B is an enlarged view of a portion of the heating assembly shown in FIG. 8A;

in fig. 9 is a perspective view of an example of a magnetic shield element placed inside an aerosol generation device;

in fig. 10 – schematic cross-section of an example of a magnetic shield element;

in fig. 11 is a top view of the device shown in FIG. 9;

in fig. 12 is a perspective view of an example of a magnetic shield element;

in fig. 13 is a schematic first example of a magnetic shield element containing recesses;

in fig. 14 is a schematic second example of a magnetic shield element containing recesses; And

in fig. 15 – schematic third example of a magnetic shield element containing holes; And

in fig. 16 is a schematic example of a charging control device for an aerosol generation device.

Carrying out the invention

As used herein, the expression "aerosol-generating substance" refers to substances that release volatile components when heated, usually in the form of an aerosol. The aerosol-generating substance includes any tobacco-containing substances and may, for example, include one or more of the following: tobacco, tobacco derivatives, ground tobacco, reconstituted tobacco, or tobacco substitutes. The aerosol-generating substance may also include other non-tobacco products, which may or may not contain nicotine, depending on the product. The aerosol generating substance may, for example, be in solid form, liquid form, gel form or wax form. The aerosol generating substance may also, for example, be a combination or mixture of substances. The aerosol generating substance may also be known as "smoking material".

A device is known that heats an aerosol-generating substance to vaporize at least one component of the aerosol-generating substance, typically to form an aerosol that can be inhaled without burning or igniting the aerosol-generating substance. Such a device is sometimes described as an “aerosol generating device”, “aerosol supply device”, “non-combustion heating device”, “tobacco product heating device” or “tobacco heating device” and the like. Likewise, there are also so-called electronic cigarettes, which typically vaporize an aerosol-generating substance in liquid form, which may or may not contain nicotine. The aerosol generating agent may be provided in the form of or as part of a rod, cartridge or cassette, or the like that can be inserted into the device. The heater for heating and evaporating the aerosol-generating substance can be made in the form of a “permanent” part of the device. The device may be a handheld device designed to be held in the user's hand when used to generate an aerosol that the user can inhale.

The aerosol generating device may receive an article containing an aerosol generating substance for heating. An "article" in this context is a component that includes, or contains in use, an aerosol-generating substance that is heated to vaporize the aerosol-generating material and, optionally, other components used. The user may insert the article into the aerosol generating device before it is heated to produce an aerosol, which is then inhaled by the user. The article, for example, may be of a predetermined or specific size, that is, configured to be placed in the heating chamber of the device, which is sized to receive the article.

Examples of the present invention relate to an aerosol generating apparatus that includes an induction heating circuit for inductively heating a current collector structure. The susceptor structure is configured such that when used when inductively heated by an induction heating circuit, it heats an aerosol-generating substance to thereby generate an aerosol.

The pantograph may be heated by the passage of an alternating magnetic field generated by an inductor or, in some examples, another type of induction element through the pantograph. The heated current collector, in turn, heats the substance that generates the aerosol.

The inductor may, in use, extend around the pantograph. The current collector may, for example, form part of an aerosol generation device. In one example, the current collector forms a receptacle for inserting an aerosol-generating substance that needs to be heated. For example, the pantograph may be substantially tubular (ie, hollow) and may be configured to insert an aerosol-generating substance into a tubular receptacle formed by the pantograph. In one example, the aerosol generating substance is tubular or cylindrical in shape and may be known as a "tobacco stick", for example, the aerosolized material may contain shaped tobacco which is then coated or wrapped in one or more other materials such as paper or foil . Alternatively, the current collector may not be a component of the device, but may be attached to or contained within an article inserted into the device.

An inductive heating circuit emits electromagnetic radiation when alternating current flows through the circuit. For example, electromagnetic radiation is emitted when alternating current flows within the inductive element to heat the current-collecting structure. The device may also emit electromagnetic radiation while the device is charging. For example, during charging, electromagnetic radiation may occur due to at least a change in voltages occurring in the device's charging circuit.

The device can be configured so that the level of emitted electromagnetic radiation in frequency ranges in units of dBμV/m is within predetermined levels. For example, the aerosol generating device may be configured such that, during operation, the level of electromagnetic radiation emitted by the device in the frequency range from 30 MHz to 225 MHz is less than 40 dBμV/m and/or such that the level of electromagnetic radiation emitted by the device in the range frequencies from 235 MHz to 1 GHz was less than 47 dBµV/m. The device may be configured such that, during operation, the level of electromagnetic radiation emitted by the device is less than 70 dBμV/m in the frequency range from 1 GHz to 3 GHz and/or less than 74 dBμV/m in the frequency range from 3 GHz to 6 GHz.

In some examples, the average emitted radiation level for a device during operation in the frequency range from 1 GHz to 3 GHz may be less than about 50 dBμV/m, and/or the average emitted radiation level for a device during operation in the frequency range from 3 GHz to 6 GHz may be less than about 54 dBµV/m.

The levels of electromagnetic radiation emitted by a device can be measured using an electromagnetic radiation test. In one example, an electromagnetic emission test measures electromagnetic emissions from a device over an appropriate frequency range while the device is operating. The test can be performed while the device is operating in different ways, such as during charging or while discharging, such as during normal use to produce an aerosol. The device may be designed such that the level of radiation it emits is below the levels described above during charging of the device and discharging of the device. It should be noted that in some examples, the level of electromagnetic radiation emitted by a device during operation in one or more specific frequency ranges, such as the frequency range 30 MHz to 225 MHz, and/or 235 MHz to 1 GHz, or any other frequency ranges described in this document may be essentially zero.

In one example, in an electromagnetic radiation test, the level of electromagnetic radiation emitted by a device is measured using an antenna located at a standardized position relative to the device. The device is actuated, such as charged or discharged, while the antenna measures the electromagnetic radiation emitted by the device in the frequency range of interest.

In addition, the device may be designed to have a certain level of immunity to electromagnetic radiation. When testing a device's immunity to electromagnetic radiation, electromagnetic radiation may originate from the antenna and be incident on the device. A device may be tested to determine whether it continues to operate as intended while it is exposed to electromagnetic radiation and thereafter. The setup for the electromagnetic immunity test may be the same as for the electromagnetic radiation test. That is, some examples may use the same antenna and standardized distances between the antenna and the device. In one example, an electromagnetic radiation immunity test may expose a device to electric fields of 3 V/m ranging from 80 MHz to 1 GHz and evaluate the effect of this radiation on the performance of the device.

In some examples, the device may be configured to meet one or more predetermined conducted emission levels over a specific frequency range. For example, the level of conducted noise on the power cord that supplies power to charge a device may be limited to a preset level. These levels of conducted emissions may act to protect broadcasting and telecommunication services used in the immediate vicinity of the device. For example, the device may be configured to have conducted electromagnetic emissions of less than about 66 dBµV in the frequency range 150 kHz to 30 MHz. In some examples, the device may be configured such that the level of conducted electromagnetic emissions at frequencies from 150 kHz to 500 kHz is less than about 66 dBμV, while at a frequency of about 150 kHz the device is configured such that the level of conducted electromagnetic emissions is less than about 66 dBμV. and at a frequency of about 500 kHz, the level of conducted electromagnetic radiation is less than 56 dBµV. The device may be designed such that, in the frequency range from 500 kHz to 5 MHz, the level of conducted electromagnetic emissions is less than approximately 56 dBμV. The device may be designed such that, in the frequency range from 5 MHz to 30 MHz, the level of conducted electromagnetic emissions is less than approximately 60 dBμV. In some examples, conducted emission levels can be determined by measuring quasi-peak levels, which can be measured using a methodology that is well understood.

To provide a device with levels of electromagnetic radiation and, in some examples, electromagnetic immunity as described above, the inventors have proposed device features that reduce the level of radiation emitted by the device in the relevant frequency range and can also provide immunity to electromagnetic radiation incident on the device. Some features may also shield device components and thus provide some level of protection from incident electromagnetic radiation. For example, to block/absorb electromagnetic radiation emitted by device components, the device may include a magnetic shield element. For example, a magnetic shield element may extend at least partially around the inductive element to protect other nearby electrical devices (as well as other electrical components of the aerosol generation device) from electromagnetic radiation generated by the inductive element. If the inductive element is a coil, then the magnetic shield may extend around the coil, and the shield may be at least partially coupled to itself to secure it in place around the coil.

The magnetic shield element may contain one or more layers/sheets of ferrite material to mitigate the effects of electromagnetic radiation emitted by the device components. In addition, a magnetic shield can shield device components from incident electromagnetic radiation and thus provide some level of immunity to electromagnetic radiation incident on the device.

Often ferrite material can be bonded to the inside surface of the device's case/cover, however this requires a large amount of ferrite material to adequately contain electromagnetic radiation. This material can be relatively heavy, bulky and expensive, so it is advisable to reduce the amount used.

Some examples herein provide a more efficient arrangement of the magnetic shield element within the aerosol generating device. Accordingly, in some examples, the device includes a magnetic shield element contacting and extending at least partially around the inductor. The magnetic shield element contains a material such as ferrite material that absorbs/blocks electromagnetic radiation. By being located closer to the inductor, less ferrite material is required. It has been found that in some cases the amount of material used can be reduced by up to 30% while providing an effective level of electromagnetic shielding.

The inductor may extend around the pantograph/receiver in a spiral manner. The pantograph may define a longitudinal axis such that the magnetic shield element extends around the longitudinal axis in an azimuthal direction, thereby forming a complete or partial tubular structure.

The magnetic shield element may comprise a magnetic shielding layer, such as a ferrite layer. Ferrite is a ferrimagnetic material, which means it can be magnetized and/or attracted to a magnet. In some examples, the magnetic shielding layer is magnetized.

The aerosol generating device may contain two or more inductors. For example, the first inductor coil may extend around the first pantograph/sink portion, and the second inductor coil may extend around the second receiver/sink portion. The first and second inductors may be located adjacent to each other in a direction along the longitudinal axis of the receiver/pantograph. In such a device, the magnetic shield element may contact and extend at least partially around the first and second inductors.

In some designs, the magnetic shield element may be attached to the inductor using an adhesive layer. The adhesive layer holds the magnetic shield element in place, thereby providing adequate protection from electromagnetic radiation. The adhesive may be applied to the inductor, and the magnetic shield element may be brought into contact with the adhesive. Alternatively, the magnetic shield element may contain an adhesive layer and therefore be self-adhesive. For example, the magnetic shield element may comprise a magnetic shielding layer and an adhesive layer. An adhesive layer may be formed on the inner surface of the magnetic shield element (that is, on the surface that is closest to the inductor). This can make device assembly more efficient and effective. For example, the magnetic shield element can be applied directly to the inductor without first applying adhesive to the inductor.

The magnetic shield element may be wound around the inductor and at least partially connected to itself. This arrangement provides a more protective/closed shield from electromagnetic radiation since the magnetic shield element is partially or completely sealed along its length. For example, the first edge of the magnetic shield element may overlap with the second edge of the magnetic shield element such that the magnetic shield element is attached/sticked to itself in the area of overlap. Thus, the magnetic shield element can be formed from a sheet rolled into a tube. The connection can be provided, for example, by an adhesive layer of a magnetic shield element.

The magnetic shield element may comprise at least one magnetic shielding layer and at least one laminate layer. It can be made in addition to the adhesive layer or instead of it. It has been found that the ferrite material (i.e., the magnetic shielding layer) can begin to crumble over time as a result of repeated heating and cooling within the aerosol generation device. The crumbling material may become loose and rattle inside the device. Loose material may damage or affect other components of the device. By including a laminate layer (such as a film layer), the magnetic shielding layer is less likely to crumble and weaken.

The laminate layer may be located on the outer surface of the magnetic shield element. For example, it may be located radially outside the magnetic shielding layer. In one example, the laminate layer forms the outer surface of the magnetic shield element. However, in other examples there may be another layer that forms the outer surface. Here, the outer surface is the surface farthest from the inductor. The laminate layer may be adhered to the magnetic shielding layer by means of an adhesive or may be independently attached to the magnetic shielding layer.

In one example, the laminate layer contains plastic. The laminate layer may be, for example, a plastic film. In a specific example, the plastic is polyethylene terephthalate, PET.

The magnetic shield element may be formed from a sheet and may include a recess in the sheet, wherein a portion of a wire forming an inductor may be inserted into the recess. The wire portion may include, for example, the end of an inductor. The inclusion of one or more notches allows the magnetic shield element to better adhere to the inductor. The notches/slits mean the sheet is easier to wrap around the inductors and also provide a greater shielding effect. A notch is a depression at the edge of a sheet.

The sheet may be square/rectangular with one or more "notches". For example, a rectangular sheet may be subjected to a "notching" process where material is removed. Alternatively, the sheet may be manufactured with pre-formed indentations.

The aerosol generating device may also include a second inductor adjacent the inductor, and the sheet may include a second recess formed on the sheet. The second recess is designed to insert a piece of wire forming a second inductor. The inclusion of additional notches allows the magnetic shield element to better adhere to the two inductors.

In a specific example, the recess is a first recess and may be formed on a first edge of the sheet, and a second recess may be formed on a second edge of the sheet. Having recesses formed at different edges may facilitate the application of the magnetic shield element to the inductors. For example, during assembly, the first recess may be aligned with the first inductor before wrapping around the inductor, with the second inductor being inserted into the second recess.

The first recess may be offset from the second recess in a direction along a longitudinal axis defined by the receiver/pantograph. This may make the device easier to assemble due to the offset of the notches. For example, the notches ensure that the sheet can only be wrapped around the spool the correct way.

As mentioned, a notch is a depression at the edge of a sheet. This allows, for example, the sheet to be wrapped around the inductor(s) after it(es) have been installed and connected to the PCB. In another embodiment of the invention, the recesses can be replaced by through holes/openings, and the ends of the inductors can fit into these holes. This arrangement can provide greater shielding than notches, but the magnetic shield element will need to be wrapped around the inductor(s) before, for example, the ends of the inductors are connected to the PCB.

In some examples, the device includes a rechargeable power source, such as a battery, that is charged through a connector. The connector may include a charging cable that provides power to charge the power supply. The power supply can be supplied, for example, from the electrical network or from an external source of stored energy, such as a battery. While charging, the device may emit electromagnetic radiation. For example, during charging, a switch in the charging circuit may cause spikes in the electromagnetic radiation emitted by the device. The device is designed such that the emitted radiation, including said emissions during charging, is within the levels described above.

In some examples, the device includes a charging circuit for controlling battery charging. In some examples, the charging control circuit may also provide power control to various electrical components of the device. For example, the charging circuit may act as a switching charger to supply the battery with the required voltage for charging. The charging circuit, in some examples, includes a charge control device to perform switching operations to allow the charging circuit to operate as a switchable charger. The input section of the charging circuit is, in some examples, connected between the external power supply and the charging control device, while the output section of the charging circuit is connected between the charging control device and the battery, or between the charging control device and components of the device not included in the charging circuit.

The charging circuit in some examples is configured such that any electromagnetic radiation emitted by the device due to operation of the charging circuit is within the levels described above. For example, the charging circuit may contain components that limit the levels of electromagnetic radiation emitted during charging. In particular, the charging circuit may include elements that limit levels of electromagnetic emissions due to switching operations during charging. In one example, said elements may comprise a snubber circuit configured to limit the rate of change of voltage between points in the charging circuit during said switching operations. The snubber circuit in one example contains a resistor and capacitor in series and connected between a point in the charging circuit and ground. The values of the resistance and capacitance of the snubber circuit can be selected to effectively reduce the rate of change of voltage during switching operations, that is, to effectively "suppress" voltage surges due to switching operations. The resistance and capacitance values of the snubber circuit(s) may depend on any or all of the following parameters: the operating frequency of the charging circuit, the input voltage, and the output voltage.

The point in the charging circuit at which the snubber circuit is connected can also be selected to effectively reduce voltage surges. In some examples, the output section of the charging circuit includes an output inductor, with a snubber circuit connected between one end of the output inductor and ground.

In some examples, the input section of the charging circuit is configured to limit the level of electromagnetic radiation emitted by charging operations. In some examples, the input section includes an input capacitor, and the position and capacitance value of the input capacitor can be selected to function as an input capacitor in a switched charging circuit while limiting emitted electromagnetic radiation to a certain level. In some examples, the input section contains one or more inductors. The number of any such inductors and the properties of the inductors, such as inductance and DC resistance, can be selected to limit the levels of electromagnetic radiation emitted.

In some examples, the layout of the printed circuit board containing the charging circuit, and, in some examples, other electrical components of the device are configured to limit the levels of electromagnetic radiation emitted by the device.

In fig. 1 is a schematic illustration of an example setup for measuring levels of electromagnetic radiation emitted by the aerosol generation device 100. In fig. 1 device 100 is located on a turntable 50 located at a height of 0.8 m above the ground. The turntable 50 can be rotated 360° and allows the device to be rotated to measure the maximum radiation level. The antenna 51 is mounted on an antenna mast 52, with the antenna 51 positioned at a horizontal distance of 3 m from the device 100. The antenna mast 52 can be moved from 1 m to 4 m above the ground so that the maximum radiation level from the device 100 can be measured by the method "maximization" which will be well understood. In one example, antenna 51 is an ultra-wideband BiLog antenna. The test receiver 53 is connected to the antenna 51 via an electrical cable 54 such that the test receiver 53 is configured to receive electrical signals from the antenna 51. The apparatus 100 and other equipment shown in FIG. 1 can be placed, for example, in an isolated chamber. In fig. 1 shows a charging cable 55 for supplying power from an external power source (not shown) so that the device 100 can be tested while charging the device 100. In some examples, the charging cable 55 includes a power supply unit (PSU) YJC010W-0502000J configured to connect to external power source. When device 100 is tested during discharging, such as during aerosol generation, charging cable 55 is typically absent.

In some examples, a setup similar to that shown in FIG. 1 may be used to test the device 100 for immunity to electromagnetic radiation. In one example of such testing, antenna 51 can be made to emit electromagnetic radiation with a frequency of 80 MHz to 1 GHz and a field strength of 3 V/m. The operation of the device 100 may be tested to determine if there is any degradation in performance or loss of functionality due to incident electromagnetic radiation.

In fig. 2 is a graph of the levels of electromagnetic radiation emitted by an example device 100 using the example test setup described with reference to FIG. 1. In FIG. 2 shows results obtained from the device 100 during discharging, for example, during use to generate an aerosol from an aerosol generating substance contained in an article inserted into the device. Graph 2001 shows the measured level of radiation emitted by device 100 in dBμV/m as a function of frequency in Hz over the frequency range 30 Hz to 1 GHz. In this example, plot 2001 is obtained from the combined measurements in the horizontal plane and the vertical plane, and can be called a combined horizontal and vertical absolute maximum peak detector preview scan. The first set of markers 2002 above the graph 2001 represents the maximized peak detectors measured when running a certain basic reference methodology and are included for reference only. A second set of markers 2003 below graph 2001 are maximized quasi-peak detectors that can be compared to reference emitted radiation levels in certain frequency ranges to determine the level of electromagnetic radiation emitted by device 100 in a methodology that will be well understood. In some examples, the average emitted radiation level in certain frequency bands may also be determined by methods that will be well understood. In fig. 2 and 3 there is also a control line 2004 presenting for reference only the emission control levels: 40 dBµV/m in the frequency range from 30 MHz to 88 MHz; 43.5 dBµV/m in the frequency range from 88 MHz to 216 MHz; 46 dBµV/m in the frequency range from 216 MHz to 960 MHz; and 54 dBµV/m in the frequency range from 960 MHz to 1 GHz. In some examples, measured levels of radiation emitted by an example device can be compared to such reference levels.

From fig. 2, it can be seen that graph 2001 showing the levels of radiation emitted during discharge of the device 100 remain well below 40 dBμV/m in the frequency range from 30 MHz to 225 MHz and well below 47 dBμV/m in the frequency range from 235 MHz to 1 GHz. As can be seen, this is true for plot 2001, peak markers 2002, and quasi-peak markers 2003. Additionally, plot 2001 remains below about 20 dBµV/m from 30 MHz to about 400 MHz. The 2001 plot remains below approximately 32.5 dBµV/m across the entire frequency range from 30 MHz to 1 GHz.

In fig. 3 shows a graph 3001 of test results obtained in accordance with methods equivalent to those described for FIG. 2. Graph 3001 in FIG. 3 is a graph of radiation levels emitted by device 100 while charging. In the same manner as described for FIG. 2, a first set of markers 3002 represents maximized peak detectors, and a second set of markers 3003 represents maximized quasi-peak detectors.

From fig. 3, it can be seen that the graph 3001 showing the levels of radiation emitted during charging of the device 100 also remains well below 40 dBμV/m in the frequency range from 30 MHz to 225 MHz and well below 47 dBμV/m in the frequency range from 235 MHz to 1 GHz. Additionally, plot 3001 remains below about 35 dBμV/m from 30 MHz to about 500 MHz and below about 37.5 dBμV/m throughout the frequency range from 30 MHz to 1 GHz.

In fig. 4 shows an example of an aerosol generation device 100 for generating an aerosol from an aerosol generating medium/substance. In general terms, device 100 can be used to heat a removable article 110 containing an aerosol generating medium to produce an aerosol or other respirable medium that is inhaled by the user of device 100.

The device 100 includes a housing 102 (in the form of an outer casing) that surrounds and houses various components of the device 100. The device 100 has an opening 104 at one end through which the article 110 can be inserted to be heated by a heating unit. In use, article 110 may be fully or partially inserted into a heating assembly, where it may be heated by one or more components of the heating assembly.

The device 100 in this example includes a first end member 106 including a cover 108 that is movable relative to the first end member 106 to cover the opening 104 when the product 110 is not in place. In fig. 4, cover 108 is shown in an open position, however, cover 108 can be moved to a closed position. For example, the user may slide the cover 108 in the direction of arrow "A".

The device 100 may also include a user-operable control 112, such as a button or switch, that, when pressed, actuates the device 100. For example, the user may turn on the device 100 using the switch 112.

The device 100 may also include an electrical component, such as a receptacle/port 114, that may receive a cable for charging the battery of the device 100. For example, the receptacle 114 may be a charging port, such as a USB charging port or, particularly, a USC-type charging port. B.

In fig. 5 shows the device 100 shown in FIG. 4, with the outer casing 102 removed. The device 100 detects the longitudinal axis 134.

As shown in FIG. 5, a first end member 106 is located at one end of the device 100, and a second end member 116 is located at the opposite end of the device 100. The first and second end members 106, 116 together at least partially define the end surfaces of the device 100. For example, the bottom surface of the second end member member 116 at least partially defines the bottom surface of device 100. The edges of the outer casing 102 may also form part of the end surfaces. In this example, cover 108 also forms part of the top surface of device 100. In FIG. 5 also shows a second circuit board 138 associated with control element 112.

The end of the device closest to the opening 104 may be known as the proximal end (or mouthpiece end) of the device 100 because it is closest to the user's mouth in use. In use, the user inserts the article 110 into the opening 104, operates the user control element 112 to begin heating the aerosol generating agent, and draws in the aerosol generated in the device. This causes the aerosol to pass through the device 100 along a flow path to the proximal end of the device 100.

The other end of the device furthest from the opening 104 may be known as the distal end of the device 100 because it is furthest away from the user's mouth when in use. When the user draws in the aerosol generated in the device, the aerosol passes from the distal end of the device 100.

The device 100 also includes a power supply 118. The power source 118 may be, for example, a battery, such as a rechargeable battery or a non-rechargeable battery. Examples of suitable batteries include, for example, a lithium battery (such as a lithium-ion battery), a nickel battery (such as a nickel-cadmium battery), and an alkaline battery. The battery is electrically coupled to the heating assembly to supply electrical power when needed and under the control of a controller (not shown) to heat the aerosol generating material. In this example, the battery is connected to a central support 120, which holds the battery 118 in place.

The device also includes at least one electronic module 122. Electronic module 122 may include, for example, a printed circuit board (PCB). Circuit board 122 may support at least one controller, such as a processor and memory. Circuit board 122 may also include one or more electrical paths for electrically interconnecting various electronic components of device 100. For example, battery terminals may be electrically connected to circuit board 122 so that power can be distributed throughout device 100. Receptacle 114 may also be electrically connected to the battery via electrical tracks.

In one example of device 100, the heating assembly is an induction heating assembly and includes various components for heating the aerosol generating agent 110 through an induction heating process. Induction heating is the process of heating an electrically conductive object (for example, a pantograph) using electromagnetic induction. An induction heating assembly may include an inductive element, such as one or more induction coils, and a device for passing a varying electrical current, such as alternating electrical current, through the inductive element. A changing electric current in an inductive element creates a changing magnetic field. An alternating magnetic field penetrates through a pantograph suitably positioned relative to the inductive element, creating eddy currents within the pantograph. The pantograph has electrical resistance to eddy currents and hence the flow of eddy currents against this resistance causes heating of the pantograph due to Joule heating. In cases where the pantograph contains a ferromagnetic material such as iron, nickel or cobalt, heat may also be generated by magnetic hysteresis losses in the pantograph, that is, the changing orientation of magnetic dipoles in the magnetic material as a result of their alignment with the changing magnetic field. With induction heating, compared to heating by heat transfer, for example, heat is generated inside the pantograph, which ensures rapid heating. In addition, there is no need for any physical contact between the induction heater and the current collector, allowing greater freedom in design and application.

The induction heating assembly of the example device 100 includes a current collector structure 132 (referred to herein as a "susceptor"), a first inductor 124, and a second inductor 126. The first and second inductors 204, 206 are made of electrically conductive material. In this example, the first and second inductors 124, 126 are made of high frequency winding wire/cable wound in a spiral to form helical inductors 124, 126. High frequency winding wire consists of many individual wires that are individually insulated and twisted together to form a single wire. High frequency winding wires are designed to reduce skin effect losses in the conductor. In one example of device 100, the first and second inductors 124, 126 are made of copper winding wire having a substantially circular cross-section. In other examples, the winding wire may have a different cross-sectional shape, such as rectangular.

The first inductor 124 is configured to generate a first alternating magnetic field to heat the first portion of the pantograph 132, and the second inductor 126 is configured to generate a second alternating magnetic field to heat the second portion of the pantograph 132. Here, the first section of the pantograph 132 is referred to as the first pantograph zone 132a. , and the second section of the pantograph 132 is called the second pantograph zone 132b. In this example, the first inductor 124 is adjacent to the second inductor 126 in a direction along the longitudinal axis 134 of the device 100 (ie, the first and second inductors 124, 126 do not overlap). In this example, pantograph structure 132 includes one pantograph containing two zones, however, in other examples, pantograph structure 132 may include two or more pantographs. The ends 130 of the first and second inductors 124, 126 are connected to the printed circuit board 122.

It will be appreciated that the first and second inductors 124, 126 may, in some examples, have at least one characteristic that is different from the others. For example, the first inductor 124 may have at least one different characteristic than the second inductor 126. More specifically, in one example, the first inductor 124 may have a different inductance value than the second inductor 126. Referring to FIG. 5, the first and second inductors 124, 126 are of different lengths such that the first inductor 124 is wound on a smaller section of the pantograph 132 than the second inductor 126. Thus, the first inductor 124 may contain a different number of turns than the second inductor 126 (as long as the spacing between the individual turns is substantially the same). In yet another example, the first inductor 124 may be made of a different material than the second induction coil 126. In some examples, the first and second induction coils 124, 126 may be substantially identical.

In this example, the inductors 124, 126 are wound in the same direction. That is, both the first inductor 124 and the second inductor 126 are left-handed helices. In another example, both inductors 124. 126 may be right-handed spirals. In yet another example (not shown), the first inductor 124 and the second inductor 126 are wound in opposite directions. This can be useful when the inductors turn on at different times. For example, the first inductor 124 may first operate to heat the first section of the article 110, and later the second inductor 126 may operate to heat the second section of the article 110. Winding the coils in opposite directions helps reduce the current induced in the inactive coil when used in combination with a certain type of control scheme. In one example, inductors 124, 126 are wound in different directions (not shown), wherein the first inductor 124 may be a right-handed helix and the second inductor 126 may be a left-handed helix. In another such embodiment, the first inductor 124 may be a left-handed helix and the second inductor 126 may be a right-handed helix.

The current collector 132 in this example is hollow and therefore forms a receptacle into which the aerosol-generating substance is placed. For example, article 110 may be inserted into pantograph 132. In this example, pantograph 132 is tubular with a circular cross-section.

Device 100 in FIG. 5 also includes an insulating element 128, which may be generally tubular and at least partially surround the current collector 132. The insulating element 128 can be made of any insulating material, such as plastic. In this particular example, the insulating element is made of polyetheretherketone (PEEK). The insulating element 128 may help isolate the various components of the device 100 from the heat generated in the current collector 132.

The insulating element 128 may also fully or partially support the first and second inductors 124, 126. For example, as shown in FIG. 5, the first and second inductors 124, 126 are located around the insulating element 128 and are in contact with the radially outer surface of the insulating element 128. In some examples, the insulating element 128 is not adjacent to the first and second inductors 124, 126. For example, there may be a small gap between the outer surface of the insulating element 128 and the inner surface of the first and second inductors 124, 126.

In a specific example, pantograph 132, insulating element 128, and first and second inductors 124, 126 lie on the same central longitudinal axis of pantograph 132.

In fig. 6 is a partial cross-sectional side view of device 100. In this example, the outer casing 102 is again missing. The circular cross-sectional shape of the first and second inductors 124, 126 is visible in FIG. 6 more clearly.

The device 100 also includes a support 136 that engages one end of the pantograph 132 to hold the pantograph 132 in place. The support 136 is connected to the second end member 116.

The device 100 also includes a second cover/cap 140 and a spring 142 located toward the distal end of the device 100. The spring 142 allows the second cover 140 to be opened to provide access to the pantograph 132. For example, a user may open the second cover 140 to clean the pantograph 132 and/or or support 136.

The device 100 also includes an expansion chamber 144 that extends from the proximal end of the pantograph 132 to the opening 104 of the device. Located at least partially within the expansion chamber 144 is a retaining clip 146 that abuts the article 110 and retains it in the device 100. The expansion chamber 144 is connected to the end member 106.

In fig. 6 also shows a charging circuit board 123 that is located adjacent to the socket 114, which may accommodate a charger (an example of which is described below with reference to FIG. 16) to provide charging and power functions for the device 100.

In fig. 7 is an exploded view of the device 100 shown in FIG. 4, again without outer casing 102.

In fig. 8A shows a cross-section of a portion of the device 100 shown in FIG. 4. In FIG. 8B is a close-up view of the area of FIG. 8A. In fig. 8A and 8B show article 110 placed in pantograph 132, with article 110 sized such that the outer surface of article 110 is adjacent to the inner surface of pantograph 132. This provides the most efficient heating. Article 110 of this example contains an aerosol generating agent 110a. The aerosol generating agent 110a is located within the pantograph 132. The article 110 may also include other components such as a filter, wrapping materials, and/or a cooling structure.

In fig. 8B shows that the outer surface of the pantograph 132 is spaced from the inner surface of the inductors 124, 126 by a distance 150, measured in a direction perpendicular to the longitudinal axis 158 of the pantograph 132. In one specific example, the distance 150 is from about 3 mm to 4 mm, from about 3 mm to 3.5 mm or approximately 3.25 mm.

In fig. 8B also shows that the outer surface of the insulating element 128 is spaced from the inner surface of the inductors 124, 126 by a distance 152 measured in a direction perpendicular to the longitudinal axis 158 of the pantograph 132. In one specific example, the distance 152 is approximately 0.05 mm. In another example, the distance 152 is substantially 0 mm such that the inductors 124, 126 are adjacent to and touching the insulating element 128.

In one example, the pantograph 132 has a wall thickness 154 of about 0.025 mm to 1 mm, or about 0.05 mm.

In one example, pantograph 132 has a length of about 40 mm to 60 mm, about 40 to 45 mm, or about 44.5 mm.

In one example, the insulating element 128 has a wall thickness 156 of about 0.25 mm to 2 mm, 0.25 mm to 1 mm, or about 0.5 mm.

In fig. 9 is a perspective view of the printed circuit board, PCB, 122, pantograph 132, first inductor 124, and second inductor 126. In this example, the first and second inductors 124, 126 are made of wire with a circular cross-section. The first and second ends 130a, 130b of the first inductor 124 are connected to the circuit board 122. Likewise, the first and second ends 130c, 130d of the second inductor 126 are connected to the circuit board 122. In some examples, only one inductor may be present.

A magnetic shield element 202 extends around the first and second inductors 124, 126. This magnetic shield element 202 is in contact with and surrounds the first and second inductors 124, 126 to protect other components of the device 100 and/or other objects from electromagnetic radiation generated in the current collector and/or the first and second inductors 124, 126 . The magnetic shield element 202 is shown transparent to clearly show the inductors 124, 126 and current collector 132 located within the magnetic shield element 202. In this example, the magnetic shield element 202 is held in place with adhesive. In other examples, other means/components of the device 100 and/or magnetic shield element 202 may hold the magnetic shield element 202 in place.

The current collector 132 receives the article 110 and therefore forms a receptacle for inserting an aerosol-generating substance therein. In other examples (not shown), the pantograph 132 is part of the product 110 rather than the device 100, so other components may form the receiver. Receiver/pantograph 132 defines an axis 158, such as a longitudinal axis 158, around which the magnetic shield element 202 is wrapped.

Magnetic shield element 202 includes one or more components that act as a shield against electromagnetic radiation. In this example, the magnetic shield element 202 includes a magnetic shielding layer, such as a ferrite layer, that acts as a shield.

The magnetic shield element 202 may include one or more additional layers. For example, the magnetic shield element 202 may further comprise an adhesive layer and/or a laminate layer, as described for FIG. 10.

In fig. 10 is a schematic cross-sectional view of an exemplary magnetic shield element 202 prior to its wrapping around the first and second inductors 123, 126. The magnetic shield element 202 is made in the form of a sheet.

In this example, the magnetic shield element 202 includes at least three layers, including a magnetic shielding layer 206, an adhesive layer 204 applied to a first side of the magnetic shielding layer 206, and a laminate layer 208 applied to a second side of the magnetic shielding layer 206.

The adhesive layer 204 is located on the inner surface of the magnetic shield element 202 so that the magnetic shield element 202 can be attached to the first and second inductors 124, 126. The adhesive layer 204 may cover an additional protective layer (not shown), which is subsequently removed to expose the adhesive layer 204 before the magnetic shield element 202 is adhered to the first and second inductors 124, 126. The inner surface of the magnetic shield element 202 is the surface closest to the first and second inductors 124, 126 when the magnetic shield element 202 is in contact with the first and second inductors 124, 126. When the magnetic shield element 202 is wrapped around the first and second inductors 124, 126, the magnetic shield element may overlap with itself in the overlap region such that a portion of the adhesive layer 204 is in contact with the laminate layer 208.

The laminate layer 208 is located on or at the outer surface of the magnetic shield element 202. The outer surface of the magnetic shield element 202 is the surface that is located furthest from the first and second inductors 124, 126 when the magnetic shield element 202 is in contact with the first and second inductors 124, 126. In some examples, an additional layer (not shown) forms the outer surface of the magnetic shield element 202.

As mentioned previously, the ferrite material in the magnetic shielding layer 206 may crumble after many heating and cooling cycles. The laminate layer 208 prevents the material in the magnetic shielding layer 206 from scattering and moving within the device 100. The laminate layer 208 may contain plastic and, for example, may be a plastic film. In this example, the plastic is polyethylene terephthalate, PET.

In the example shown in FIG. 10, the laminate layer 208 is immediately adjacent to the magnetic shielding layer 208. For example, the laminate layer 208 may be connected to the magnetic shielding layer 208 by heat sealing. In another example, a second adhesive layer (not shown) may be located between the laminate layer 208 and the magnetic shielding layer 206.

In fig. 11 is a top view of the device shown in FIG. 9. An aerosol generating substance is inserted into the receptacle 212 formed by the pantograph 132. Arrow 210 indicates a radial direction that is directed outward from the receiver/pantograph. When the magnetic shield element 202 shown in FIG. 10 is wrapped around the first and second inductors 124, 126, the laminate layer 208 is located further from the first and second inductors 124, 126 in the radial direction 210 than the adhesive layer 204.

As shown in FIG. 9 and 11, the first and second ends 130a, 130b of the first inductor 124 extend through the recesses/holes/openings formed in the magnetic shield member 202. These recesses allow the magnetic shield element 202 to more closely fit the first and second inductors 124, 126.

In fig. 12 shows magnetic shield element 202 separately from other components. The magnetic shield sheet element 202 is rolled into a cylindrical tube and overlaps in the overlap region 224. The presence of the adhesive layer 204 means that the magnetic shield element 202 can be attached to itself in the overlap region 224, thereby providing an improved shield. In other examples, the magnetic shield element 202 does not extend completely around the first and second inductors 124, 126.

The magnetic shield element 202 includes four recesses 214, 216, 218, 220. In other examples, one or more recesses may be present. Recesses 214, 216, 218, 220 are formed on the edges of the magnetic shield element 202, and each of them receives a piece of wire forming inductors 124, 126. The wire sections include first and second ends 130a, 130b, 130c, 130d of first and second inductors 124, 126, as shown in FIG. 9.

In fig. 13 is a schematic view of the magnetic shield element 202 shown in FIG. 12, before wrapping it around the first and second inductors 124, 126. The magnetic shield element 202 is formed from a sheet that is generally rectangular in shape. The sheet defines an axis 222 that is aligned parallel to the axis defined by the receiver/pantograph 132 and the axis defined by the first and second inductors 124, 126 when the magnetic shield element 202 is wrapped around the inductors 124, 126.

The sheet includes a first recess 214 formed on a first edge 224 of the sheet. A section of wire forming a first inductor 124 is inserted into the first recess 214, the section of wire including a first end 130a. The sheet also includes a second recess 218 formed on the first edge 224 of the sheet. A section of wire forming a second inductor 126 is inserted into the second recess 218, the section of wire including the first end 130c. The sheet also includes a third recess 216 formed on the second edge 226 of the sheet. A portion of wire forming the first inductor 124 is inserted into the third recess 216, the second portion of wire including the second end 130b. The sheet also includes a fourth recess 220 formed on the second edge 226 of the sheet. A portion of wire forming a second inductor 126 is inserted into the fourth recess 220, the second portion of wire including a second end 130b. Thus, for each inductor, two recesses are formed on opposite edges of the sheet.

The recesses 214, 216, 218, 220 are all offset from each other in the direction of the axis 222 defined by the sheet (and therefore, they are all offset from each other in the direction along the longitudinal axis 158 defined by the pantograph 132 when the magnetic shield element 202 is in its place).

In fig. 14 schematically shows another example of a magnetic shield element 302 that may be used in the device 100. The magnetic shield element 302 is formed from a sheet that is generally rectangular in shape. The sheet defines an axis 322 that is aligned parallel to the axis defined by the receiver/pantograph 132 and the axis defined by the first and second inductors 124, 126 when the magnetic shield element 202 is wrapped around the inductors 124, 126.

Unlike the example shown in FIG. 13, the magnetic shield element 302 includes recesses formed along one edge of the sheet. For example, the sheet includes a first recess 314 formed on a first edge 324 of the sheet. A section of wire forming a first inductor 124 is inserted into the first recess 314, the section of wire including a first end 130a. The sheet also includes a second recess 318 formed on the first edge 324 of the sheet. A section of wire forming a second inductor 126 is inserted into the second recess 318, the section of wire including the first end 130c. The sheet also includes a third recess 316 formed on the first edge 324 of the sheet. A portion of wire forming the first inductor 124 is inserted into the third recess 316, the second portion of wire including the second end 130b. The sheet also includes a fourth recess 320 formed on the first edge 324 of the sheet. A portion of wire forming a second inductor 126 is inserted into the fourth recess 320, the second portion of wire including a second end 130b. Thus, for each inductor, two recesses are formed on the same edge of the sheet.

The recesses 314, 316, 318, 320 are all offset from each other in the direction of the axis 322 defined by the sheet (and therefore, they are all offset from each other in the direction along the longitudinal axis 158 defined by the pantograph 132 when the magnetic shield element 302 is in its place).

In fig. 15 schematically shows another example of a magnetic shield element 402 that may be used in the device 100. The magnetic shield element 402 is formed from a sheet that is typically rectangular in shape. The sheet defines an axis 422 that is aligned parallel to the axis defined by the receiver/pantograph 132 and the axis defined by the first and second inductors 124, 126 when the magnetic shield element 202 is wrapped around the inductors 124, 126.

Unlike the example shown in FIG. 13 and 14, the magnetic shield member 402 includes holes/openings/through holes formed in the sheet. Thus, the ends of the first and second inductors 124, 126 must first be passed through the holes before being connected to the circuit board 122.

The sheet includes a first hole 414 into which a section of wire is inserted to form a first inductor 124, the section of wire including a first end 130a. The sheet also includes a second hole 418 into which a section of wire is inserted to form a second inductor 126, the section of wire including the first end 130c. The sheet also includes a third hole 416 into which a second section of wire is inserted forming the first inductor 124, the second section of wire including a second end 130b. The sheet also includes a fourth hole 420 into which a second section of wire is inserted to form a second inductor 126, the second section of wire including a second end 130b.

The holes 414, 416, 418, 420 are offset from each other in the direction of the axis 422 defined by the sheet (and therefore are all offset from each other in the direction along the longitudinal axis 158 defined by the pantograph 132 when the magnetic shield element 302 is in place ).

In fig. 16 is a schematic diagram of a device 500 of an aerosol generation device 100. Description of Fig. 16 herein will focus on certain features of device 500, which is configured to provide reduced electromagnetic radiation emission from device 100. Device 500 is located in device 100, and in some examples, it may be located on circuit board 123 adjacent to socket 114 and is designed to to control charging of battery 118 from an external power source (not shown). The device 500 includes a charging control device 550. The charge control device 550 in this example is a Texas Instruments bq25898 charge control and system power path control integrated circuit, the general operation of which will be clear from the known specification of this integrated circuit. The charging control device 550 is connected to an external power source through an input section 510. The device 500 also includes an output section 520 connected between the terminals of the charging control device 550. In this example, the charging control device 550 also functions as a power management system to control the DC power supply supplied to other electrical components of the device 100. Therefore, the device 500 may function as an interface between the external power supply and the battery 118, and may also function as an interface between the battery 118 and other electrical components of the device 100.

The device 500 is configured to provide a level of electromagnetic radiation emitted by the device 100 during charging that allows the device to meet the levels of electromagnetic radiation emitted described above. The input section 510 and the output section 520 are configured to limit the level of electromagnetic radiation emitted by the device 500 while charging the device 100. In particular, the device 500 is configured to limit the peaks of the emitted radiation during periodic power switching performed by the charge control device 550 during charging. .

The input section 510 of the charger 500 is configured to receive 511 a 5V input signal from the USB-C charging port 114. Between the input 511 and the first VBUS terminal of the charging control device 550, an input inductor L3 is connected via the first line 512. Inductor L3 has an impedance of 120 ohms +/-25% at 100 MHz and a DC resistance of 25 mOhms. Inductor L3 is selected to provide reduced electromagnetic radiation from charger 500. Input inductor L3 is designed to reduce high frequency signals emanating from device 500. The +5USB reference signal is picked up at a point on first line 512 between charge control device 550 and input inductor L3. . In addition, the input section 510 includes a second line 513 connected between the input 511 and the second PMID terminal of the charging control device 550. On the second line 513, a 100 nF capacitor C7 is connected in series between the 511 input and ground. A 10 µF capacitor C113 and a 1 nF capacitor C142 are connected in parallel on a second line 513 between ground and the second PMID connection. Various capacitors C4, C12, C6, C141, C110 and diode D3 are connected in parallel between the first line 512 and the second line 513. The arrangement of components defining the input section 510 reduces the levels of electromagnetic radiation emitted by the device 500. For example, inductor L3 and various capacitors can provide a filtering effect for signals of different frequencies.

The output section 520 of the device 500 is connected to the third connection SW, the fourth terminal BTST and the fifth terminal SYS of the charging control device 550. The third terminal SW is a switching assembly that is connected to a 1 μH output inductor L102, which is connected between the third terminal SW and the fifth terminal SYS. A 47 nF capacitor C109 and a 10 ohm resistor are connected in series to the fourth pin of BTST. Two 10 µF capacitors C117, C138 are connected in parallel between the fifth SYS pin and ground. The functions of the SW, SYS, BTST pins on the output section 520 of the bq25898 charge control controller 550 will be well understood, for example, from the technical specification of this controller issued by Texas Instruments.

Output section 520 includes a "snubber circuit" connected between the third terminal SW and ground. The snubber circuit comprises a 2.2 nF capacitor C136 and a 1 ohm resistor R137, connected in series and acting to reduce, i.e., “suppress,” transient signals that might otherwise be picked up by the charge control device 550 and cause unwanted electromagnetic emissions. . The inventors have found that the arrangement of the snubber circuit comprising capacitor C136 and R137, as shown in FIG. 16 makes it possible to reduce electromagnetic emissions, in particular due to voltage peaks occurring during switching charging operations.

The arrangement of the components forming the device 500 on the circuit board 122 within the device 100 may also be configured to ensure that the levels of emitted electromagnetic radiation during charging are maintained within the levels described above. For example, the orientation of inductor L102 on circuit board 122 is selected to limit such emitted radiation levels, while effective component grounding is optimized to reduce electrical noise. Effective grounding can be achieved, for example, by providing a good contact area between the individual components and the circuit board 122.

In some examples, device 100, such as a controller (not shown) of device 100, is configured to output rapidly varying voltage signals to control various functions of device 100. For example, varying voltage signals at certain frequencies may be used to provide control functions for an induction heating circuit. comprising coils 124, 126. In some examples, these rapidly changing signals may be filtered to remove certain AC frequencies and thereby provide a signal that is substantially constant at a given frequency to provide a specific reference voltage for controlling, for example, a certain aspect an inductor circuit comprising coils 124, 126. For example, in one example, a filtered 20 kHz pulse modulated signal may be filtered by suitable filter components, such as a capacitor and resistor arrangement, to provide a reference voltage that is substantially constant at a lower frequency , for example 64 Hz. This reference voltage may be used to control aspects of the induction circuit to operate the inductors 124, 126. In some examples, the device is configured to limit peak levels of emitted electromagnetic radiation, leaving a portion of the higher frequency signal, such as 20 kHz, superimposed on the lower frequency signal. This effect can be achieved by appropriate selection of filter components, such as capacitors and resistors, in certain examples. This can spread the signal energy over a wider bandwidth and thus provide lower electromagnetic emissions from the device 100 than if the higher frequency signal were more completely filtered.

The above embodiments are to be understood as illustrative examples of the invention. Other embodiments of the invention are provided. It should be understood that any feature described with respect to any one embodiment may be used alone or in combination with other features described, and may also be used in combination with one or more features of any other embodiment or any combination of any other embodiments. . In addition, equivalents and modifications not described above may also be used without departing from the scope of the invention, which is defined in the accompanying claims.

Claims (40)

1. An aerosol generation device containing: an induction heating circuit for inductively heating the susceptor structure to heat the aerosol generating substance to thereby generate an aerosol; wherein the device is designed so that during operation the level of electromagnetic radiation emitted by the device is: less than 40 dBµV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and /or less than 74 dBµV/m in the frequency range from 3 to 6 GHz, wherein the device comprises a magnetic shield element configured to extend at least partially around the induction heating circuit or current-receiving structure; wherein the magnetic shield element contains one or more recesses. 2. The aerosol generation device according to claim 1, which is designed so that during operation the level of electromagnetic radiation emitted during operation of the device is less than 40 dBμV/m in the frequency range from 30 to 225 MHz and less than 47 dBμV/m in the frequency range from 235 MHz to 1 GHz. 3. The aerosol generating device according to claim 1 or 2, which 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 operation of the device is less than 40 dBμV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in frequency range from 3 to 6 GHz. 4. An aerosol generation device according to any one of claims. 1–3, in which the radiation level it emits is the radiation level measured in both the vertical and horizontal planes. 5. An aerosol generation device according to any one of paragraphs. 1-4, wherein the level of electromagnetic radiation emitted by the device is the level of electromagnetic radiation measured using a test apparatus for measuring levels of electromagnetic radiation emitted, wherein, optionally, the level of radiation emitted by the device is a level determined by measuring peak or quasi-peak levels of radiation emitted by the device. 6. An aerosol generation device according to any one of claims. 1-5, which includes a current-receiving structure, wherein during operation an aerosol-generating substance is inserted into the device such that the current-receiving structure is configured to heat the aerosol-generating substance. 7. An aerosol generation device according to any one of claims. 1-6, which is a tobacco heating device configured to heat, but not burn, the tobacco material to form an aerosol during operation. 8. An aerosol generation device according to any one of claims. 1–7, which is a portable device. 9. An aerosol generation device according to any one of claims. 1-8, wherein the induction heating circuit includes an inductive element configured to generate an alternating magnetic field to heat the current-receiving structure, wherein the magnetic shield element is configured to extend at least partially around the inductive element. 10. An aerosol generation device according to any one of claims. 1-9, which includes a receiver designed to be inserted therein during operation of an aerosol-generating substance to be heated by a current-receiving structure, the inductive element being an inductor extending around the receiver. 11. An aerosol generation device according to claim 10, in which the receiver is formed by a current-receiving structure. 12. An aerosol generation device according to any one of paragraphs. 1-11, in which the magnetic shield element surrounds the inductive element, and the magnetic shield element is at least partially connected to itself. 13. An aerosol generation device according to any one of claims. 1-12, which includes a charger configured to control charging of a battery of a device from a power source external to the device, wherein the charger is configured such that, during control of charging of the device, peak levels of electromagnetic radiation emitted by the device due to operation of the charger, were less than 40 dBµV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz. 14. The aerosol generating device of claim 13, wherein the charger is configured to perform switching operations during charging, wherein the charger includes a snubber circuit for limiting the rate of change of voltage during switching operations of the charger. 15. An aerosol generation device according to claim 14, in which the charger contains: an input section configured to connect to an external power source to receive energy from it to charge the device; an output section connected to the output inductor; And a charging control controller connected between the input and output sections and configured to receive power from the input section and control current supplied to the output section. 16. An aerosol generation device according to claim 15, in which the damper circuit is located in the output section of the charger. 17. The aerosol generating device of claim 15 or 16, wherein the charger input section includes an input inductor for filtering high frequency signals input to the charge control controller. 18. An aerosol generation device according to any one of paragraphs. 1-17, which is designed such that, during operation to heat the aerosolized substance, the level of electromagnetic radiation emitted by the device in the frequency range from 30 MHz to 1 GHz is less than about 35 dBμV/m. 19. The aerosol generating device according to claim 18, which is configured such that, during operation to heat the aerosolized substance, the level of electromagnetic radiation emitted by the device in the frequency range from 30 to 400 MHz is less than about 20 dBμV/m. 20. An aerosol generation device according to any one of claims. 1-19, which is designed such that during charging, the level of electromagnetic radiation emitted by the device in the frequency range of 300 MHz to 1 GHz is less than about 37.5 dBµV/m. 21. An aerosol generation device according to any one of paragraphs. 1-20, which is designed such that during charging the level of electromagnetic radiation emitted by the device in the frequency range from 30 to 500 MHz is less than about 35 dBμV/m. 22. An aerosol generation device according to any one of paragraphs. 1-21, which is configured such that the average emitted radiation level for the device during operation in the frequency range from 1 to 3 GHz is less than about 50 dBμV/m and/or the average emitted radiation level for the device during operation in the frequency range from 3 up to 6 GHz is less than 54 dBµV/m. 23. A system containing an aerosol generation device according to any one of paragraphs. 1-22 and a charging cable for providing charging from an external power source for charging the device, wherein the system is configured such that while the device is charging, the level of electromagnetic radiation emitted by the system is less than 40 dBμV/m in the frequency range of 30 to 225 MHz, and /or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz. 24. The system of claim 23, wherein while the device is charging, the level of electromagnetic radiation emitted by the system in the frequency range 300 MHz to 1 GHz is less than about 37.5 dBμV/m. 25. The system according to claim 23 or 24, which is designed so that while the device is charging, the level of conducted electromagnetic radiation on the charging cable due to the operation of the device is: less than about 66 dBµV in the frequency range from 150 to 500 kHz; and/or less than about 56 dBµV at about 500 kHz; and/or less than about 56 dBµV in the frequency range from 500 kHz to 5 MHz; and/or less than about 60 dBµV in the frequency range from 5 to 30 MHz. 26. An aerosol generation system containing an aerosol generation device according to any one of claims. 1–22 and an article containing an aerosolizable substance, wherein the system is designed so that during the generation of an aerosol from the aerosolizable substance, the level of electromagnetic radiation emitted by the system is less than 40 dBμV/m in the frequency range from 30 to 225 MHz, and/or less than 47 dBµV/m in the frequency range from 235 MHz to 1 GHz, and/or less than 70 dBµV/m in the frequency range from 1 to 3 GHz, and/or less than 74 dBµV/m in the frequency range from 3 to 6 GHz. 27. The aerosol generation system of claim 26, which is configured such that during the generation of an aerosol from the aerosolized substance, the level of electromagnetic radiation emitted by the system is less than about 35 dBμV/m in the frequency range from 30 to 500 MHz. 28. The aerosol generation system of claim 27, which is configured such that during the generation of an aerosol from the aerosolized substance, the level of electromagnetic radiation emitted by the system in the frequency range from 30 to 400 MHz is less than about 20 dBμV/m.