| abstract |
An inductive heating device ( 1 ) for heating an aerosol-forming substrate ( 20 ) comprising a susceptor ( 21 ) comprises: a device housing ( 10 ), a DC power source ( 11 ) for providing a DC supply voltage (V DC ) and a DC current (I DC ), a power supply electronics ( 13 ) comprising a DC/AC converter ( 132 ) comprising an LC load network ( 1323 ) comprising a series connection of a capacitor (C 2 ) and an inductor (L 2 ) having an ohmic resistance (R Coil ), a cavity ( 14 ) in the device housing ( 10 ) for accommodating a portion of the aerosol-forming substrate ( 20 ) to inductively couple the inductor (L 2 ) to the susceptor ( 21 ). The power supply electronics ( 13 ) further comprises a microcontroller ( 131 ) programmed to determine from the DC supply voltage (V DC ) and from the DC current (I DC ) an apparent ohmic resistance (R a ), and from the apparent ohmic resistance (R a ) the temperature (T) of the susceptor ( 21 ). It is further programmed to monitor changes in the apparent ohmic resistance (R a ) and to detect a puff when a decrease of the apparent ohmic resistance (R a ) is determined which is indicative of a temperature decrease of the susceptor ( 21 ) during a user inhalation. |