Abstract: A method for controlling the heating of a susceptor of an aerosol-generating device is described, the susceptor being inductively heated by an oscillating circuit driven by an inverter at an operating frequency. The method includes a power delivery mode of the aerosol-generating device, a step of updating the operating frequency being performed during the power delivery mode and including the following sub-steps: determining, using a controller, the resonant frequency of the oscillating circuit during heat of the susceptor; and setting, using the controller, the operating frequency at the determined resonant frequency. The updating step is continuously repeated during power delivery mode of the aerosol-generating device.

Abstract: A heating system for an aerosol generation assembly, includes a coil, a susceptor and an oscillation circuitry configured to generate AC current on the coil from a DC current provided by the battery. The oscillation circuitry comprises includes at least one power circuit including two power transistors (Q1A, Q1B) and a bias line (LA, LB) for each power transistor (Q1A, Q1B). Each power transistor (Q1A, Q1B) includes a gate terminal connected to the corresponding bias line (LA, LB) and able to control the current between the corresponding source and drain terminals. The oscillation circuitry further includes a microcontroller connected to both bias lines (LA, LB) and able to generate a voltage signal on each of the bias lines (LA, LB). The at least one power circuit further includes a potential divider defining an output terminal (T) connected to the microcontroller.

Abstract: A method for controlling the heating of a susceptor of an aerosol-generating device is described, the susceptor being inductively heated by an oscillating circuit driven by an inverter, an optional boost converter being connected between a power supply unit and the inverter, the boost converter and being configured to step-up voltage from an input voltage supplied from the power supply unit to an output voltage delivered to the inverter. The method includes a power delivery mode of the aerosol-generating device and a temperature identification mode of the aerosol-generating device in which the amount of power supplied to the inverter is lower than the amount of power supplied during the power delivery mode. The method includes determining the temperature of the susceptor, e.g. based on a determined resonant frequency or resonant capacitor voltage of the oscillating circuit.

Abstract: The present invention concerns a method for controlling a heating system for an aerosol generation assembly containing a vaporizable material. The method includes controlling the temperature of a susceptor, during a pre heating phase, based on at least one vaporizable material characteristic inherent to the vaporizable material, at least one device characteristic inherent to the aerosol generation assembly, or on an ambient characteristic inherent to the ambient area; and controlling the temperature of the susceptor, during a heating phase, based on temperature measurements provided by a heating temperature sensor and a predetermined offset.

Abstract: An aerosol generating system comprises an aerosol generating substrate, an inductor for generating a primary electromagnetic field, a primary susceptor configured to be inductively heated by the primary electromagnetic field and to solely heat the aerosol generating substrate, and a secondary susceptor configured to solely generate a secondary electromagnetic field. The secondary electromagnetic field is generated under the influence of the primary electromagnetic field and acts in opposition to the primary electromagnetic field.

Abstract: An aerosol generating system includes an induction heatable susceptor, an induction coil arranged to generate a time varying electromagnetic field for inductively heating the induction heatable susceptor, a power source for supplying power to the induction coil and a controller. The controller is arranged to detect the self-resonant frequency of the induction coil and to control the operation of the aerosol generating system based on the detected self-resonant frequency. An aerosol generating device is also described.

Abstract: A system for a power switch of a multiphase power converter coupled to an inductive load including a test controller, a voltage sampling circuit, a processing circuit, and a converter. A test pulse is applied to power switches of the converter to generate a test current through the inductive load, which forward biases a body diode of a power switch during a freewheel portion after the test pulse is completed. The voltage across the body diode is sampled during the freewheel portion, and the voltage samples are converted to a voltage value and a slope value. The voltage and slope values are converted to an estimated temperature value based on a characterization of the inductive load and the body diode. The conversion may be performed by a lookup table that stores an estimated temperature value for each unique combination of the voltage and slope values.

Abstract: A system for a power switch of a multiphase power converter coupled to an inductive load including a test controller, a voltage sampling circuit, a processing circuit, and a converter. A test pulse is applied to power switches of the converter to generate a test current through the inductive load, which forward biases a body diode of a power switch during a freewheel portion after the test pulse is completed. The voltage across the body diode is sampled during the freewheel portion, and the voltage samples are converted to a voltage value and a slope value. The voltage and slope values are converted to an estimated temperature value based on a characterization of the inductive load and the body diode. The conversion may be performed by a lookup table that stores an estimated temperature value for each unique combination of the voltage and slope values.