An aerosol-generating device for generating an aerosol by inductive heating of an aerosol-forming substrate is provided, the device including: a device housing including a cavity configured to removably receive the substrate to be heated; an inductive heating arrangement including at least one induction coil configured to generate an alternating magnetic field within the cavity, the coil being arranged around at least a portion of the cavity; and a flux concentrator arranged around at least a portion of the induction coil and configured to distort the alternating magnetic field of the at least one inductive heating arrangement towards the cavity, the flux concentrator including or being made of a flux concentrator foil, and the flux concentrator foil including at least one of a permalloy or a nano-crystalline soft magnetic alloy. An aerosol-generating system including the aerosol-generating device and an aerosol-generating article is also provided.

An induction heating apparatus including an inverter comprising a switching element, the inverter configured to supply a power to a first node based on an operation of the switching element; a first heating coil around which a wire is wound in a first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; a second heating coil around which a wire is wound in a second winding direction different from the first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; and at least one processor configured to control a resonance frequency of a current flowing through the first heating coil and the second heating coil.

An induction heating apparatus including an inverter comprising a switching element, the inverter configured to supply a power to a first node based on an operation of the switching element; a first heating coil around which a wire is wound in a first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; a second heating coil around which a wire is wound in a second winding direction different from the first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; and at least one processor configured to control a resonance frequency of a current flowing through the first heating coil and the second heating coil.

Disclosed is an induction heating device. The disclosed induction heating device senses whether a container placed on a heating coil is off-center, and if so, the direction in which the container is off-center, on the basis of a change in the resonance current of a plurality of sensing coils disposed along the circumferential direction above the heating coil. Each of the plurality of sensing coils includes a plurality of first layer sensing coils and a plurality of second layer sensing coils. Each of the plurality of first layer sensing coils is electrically connected to a corresponding second layer sensing coil among the plurality of second layer sensing coils. The first layer sensing coil and the second layer sensing coil that are connected to each other are vertically misaligned and have opposite winding directions.

Disclosed is an induction heating device. The disclosed induction heating device senses whether a container placed on a heating coil is off-center, and if so, the direction in which the container is off-center, on the basis of a change in the resonance current of a plurality of sensing coils disposed along the circumferential direction above the heating coil. Each of the plurality of sensing coils includes a plurality of first layer sensing coils and a plurality of second layer sensing coils. Each of the plurality of first layer sensing coils is electrically connected to a corresponding second layer sensing coil among the plurality of second layer sensing coils. The first layer sensing coil and the second layer sensing coil that are connected to each other are vertically misaligned and have opposite winding directions.

An aerosol-generating device is provided, including: a device cavity having proximal and distal ends, the proximal end of the cavity to receive an aerosol-generating article; an inductive heating arrangement to heat the substrate and including: a susceptor arrangement heatable by penetration with a varying magnetic field to heat the substrate, a first LC circuit having a first resonance frequency and including a first inductor coil towards the proximal end and a first capacitor, and a second LC circuit having a second resonance frequency different from the first resonance frequency and including a second inductor coil towards the distal end and a second capacitor, and having a different number of turns than the first coil; and a controller to initiate heating of the substrate by driving a first varying current in the first coil and subsequently driving a second varying current in the second coil.

An aerosol-generating device is provided, including: a device cavity having proximal and distal ends, the proximal end of the cavity to receive an aerosol-generating article; an inductive heating arrangement to heat the substrate and including: a susceptor arrangement heatable by penetration with a varying magnetic field to heat the substrate, a first LC circuit having a first resonance frequency and including a first inductor coil towards the proximal end and a first capacitor, and a second LC circuit having a second resonance frequency different from the first resonance frequency and including a second inductor coil towards the distal end and a second capacitor, and having a different number of turns than the first coil; and a controller to initiate heating of the substrate by driving a first varying current in the first coil and subsequently driving a second varying current in the second coil.

A method of controlling an aerosol-generating system is provided, the system including: an inductive heating arrangement to heat an aerosol-forming substrate and including an inductive heating element including a susceptor to heat the substrate, and first and second inductor coils; a power supply to supply power to the arrangement; and the method including: driving a first varying current in the first coil to generate a first varying magnetic field and controlling the first current such that a temperature of the first portion of the heating element increases to a first operating temperature; and driving a second varying current in the second coil to generate a second varying magnetic field and controlling the second current such that a temperature of the second portion of the heating element increases to a second operating temperature, the second current is not driven when the first current is driven and vice versa.

A method of controlling an aerosol-generating system is provided, the system including: an inductive heating arrangement to heat an aerosol-forming substrate and including an inductive heating element including a susceptor to heat the substrate, and first and second inductor coils; a power supply to supply power to the arrangement; and the method including: driving a first varying current in the first coil to generate a first varying magnetic field and controlling the first current such that a temperature of the first portion of the heating element increases to a first operating temperature; and driving a second varying current in the second coil to generate a second varying magnetic field and controlling the second current such that a temperature of the second portion of the heating element increases to a second operating temperature, the second current is not driven when the first current is driven and vice versa.

An induction-heating system includes a susceptor located proximate to a flight surface of an aircraft. The susceptor comprises an array of wires arranged along a first axis. The array of wires is constructed of a ferromagnetic material having a selected Curie temperature. The induction-heating system also includes an electrically conductive coil including a plurality of coil windings oriented substantially perpendicular with respect to the first axis of the array of wires. The electrically conductive coil is configured to generate a magnetic field oriented substantially parallel with respect to the first axis of the array of wires. The electrically conductive coil is positioned to induce induction heating within the ferromagnetic material of the susceptor when the susceptor is below the selected Curie temperature.