| 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 (C2) and an inductor (L2) 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 (L2) 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. |