Aerosol generating device

Abstract

When a first susceptor is extracted from an insertion device and then a second susceptor different from the first susceptor is inserted into the insertion space, an aerosol generating device controls a power supply unit according to a preset power profile to obtain calibration reference current corresponding to a calibration reference temperature of the second susceptor, and determines a temperature of the second susceptor based on the calibration reference temperature and the calibration reference current.

What is claimed is: 
     
         1 . An aerosol generating device comprising:
 a power supply unit configured to output direct current (DC) power;   a power conversion unit configured to convert the DC power into alternating current (AC) power;   an induction coil configured to receive the AC power and generate an alternating magnetic field;   a first susceptor that is replaceably inserted into an insertion space and is configured to generate heat due to the alternating magnetic field generated by the induction coil; and   a controller configured to determine a temperature of the first susceptor based on DC current output by the power supply unit,   wherein the controller is further configured to, when the first susceptor is extracted from the insertion space and then a second susceptor different from the first susceptor is inserted into the insertion space, control the power supply unit according to a preset power profile to obtain calibration reference current corresponding to a calibration reference temperature of the second susceptor, and determine a temperature of the second susceptor based on the calibration reference temperature and the calibration reference current.   
     
     
         2 . The aerosol generating device of  claim 1 , further comprising an input unit configured to receive a user input,
 wherein the controller is further configured to, when the input unit receives the user input equal to or longer than a preset input time, determine that a calibration mode has been entered and obtain the calibration reference current corresponding to the calibration reference temperature of the second susceptor.   
     
     
         3 . The aerosol generating device of  claim 1 , further comprising a memory in which information about DC power output by the power supply unit in a first period and a second period consecutive to the first period is stored,
 wherein the controller is further configured to, when a calibration mode has been entered, control the power supply unit to control the power supply unit to output first DC power in the first period and output second DC power less than the first DC power in the second period.   
     
     
         4 . The aerosol generating device of  claim 3 , wherein the power supply unit comprises a battery and a DC/DC converter connected to the battery,
 wherein the controller is further configured to control the DC/DC converter so that the DC/DC converter outputs the first DC power and the second DC power, by adjusting a DC voltage from among DC current and the DC voltage output by the DC/DC converter.   
     
     
         5 . The aerosol generating device of  claim 1 , wherein the controller is further configured to, in a calibration mode, set first DC power and second DC power, which are output by the power supply unit, so that the second susceptor converges to the calibration reference temperature. 
     
     
         6 . The aerosol generating device of  claim 1 , wherein the controller is further configured to, in a calibration mode, determine that the second susceptor has reached the calibration reference temperature when the DC current output by the power supply unit is maintained within a reference range for a preset reference time. 
     
     
         7 . The aerosol generating device of  claim 6 , wherein the controller is further configured to determine that the DC current output by the power supply unit at a time when the second susceptor reaches the calibration reference time is the calibration reference current. 
     
     
         8 . The aerosol generating device of  claim 7 , wherein the controller is further configured to previously obtain first DC current output by the power supply unit at a time when the first susceptor reaches the calibration reference temperature, and obtain a calibration value based on a difference between the calibration reference current and the first DC current. 
     
     
         9 . The aerosol generating device of  claim 8 , wherein the controller is further configured to calibrate a corresponding relationship between DC current output by the power supply unit and a temperature of the second susceptor based on the calibration value. 
     
     
         10 . The aerosol generating device of  claim 9 , wherein the controller is further configured to determine a temperature of the second susceptor based on the calibrated corresponding relationship.