Aerosol generating device

1. An aerosol generating device comprising:

a heater configured to heat an aerosol generating substance;

a battery configured to supply power to the heater;

a thermoelectric element arranged adjacent to the heater, and configured to absorb heat from the heater and convert the absorbed heat into electric power;

a charger configured to store the converted power; and

a controller configured to control the charger to charge the battery based on a heating time of the heater.

2. The aerosol generating device of claim 1 ,

wherein the controller is further configured to start supplying the converted power to the battery when a pre-set pre-heating time has elapsed.

3. The aerosol generating device of claim 1 ,

wherein the controller is further configured to start supplying the converted power to the battery from when a pre-set time is left before heating of the heater ends.

4. The aerosol generating device of claim 1 ,

further comprising a timer configured to measure the heating time of the heater.

5. An aerosol generating device comprising:

a heater configured to heat an aerosol generating substance;

a battery configured to supply power to the heater;

a thermoelectric element arranged adjacent to the heater, and configured to absorb heat from the heater and convert the absorbed heat into electric power;

a charger configured to store the converted power; and

a controller configured to control the charger to charge the battery by using the converted power based on a heating temperature of the heater.

6. The aerosol generating device of claim 5 ,

wherein the controller is further configured to start supplying the converted power to the battery when the temperature of the heater reaches a pre-set pre-heating temperature.

7. The aerosol generating device of claim 5 ,

wherein the controller is further configured to start supplying the converted power to the battery when an absolute value of a temperature change of the heater per unit time is less than a pre-set threshold value.

8. The aerosol generating device of claim 5 ,

wherein the controller is further configured to start supplying the converted power to the battery when the temperature of the heater reaches a second temperature lower than a first temperature after the temperature of the heater has reached the first temperature.

9. The aerosol generating device of claim 5 ,

further comprising a temperature detector configured to detect the temperature of the heater.

10. An aerosol generating device comprising:

a heater configured to heat an aerosol generating substance;

a battery configured to supply power to the heater;

a thermoelectric element comprising:

a first electrode arranged adjacent to the heater;

a second electrode arranged apart from the first electrode; and

a thermoelectric material arranged between the first electrode and the second electrode, and configured to generate power by using a Fermi level difference between the first electrode and the second electrode caused by an electric field generated as electrons or holes excited by heat from the heater move from the first electrode to the second electrode;

a charger configured to store the converted power; and

a controller configured to control the charger to charge the battery based on at least one of a heating time of the heater, a heating temperature of the heater, and a charge level of the battery.

11. The aerosol generating device of claim 10 ,

wherein the thermoelectric element further comprises a cooler connected to the second electrode and configured to cool the second electrode.

12. The aerosol generating device of claim 10 ,

wherein the thermoelectric element further comprises a heat absorber connected to the first electrode, and configured to absorb heat generated by the heater and transfer the heat to the first electrode.

13. The aerosol generating device of claim 10 , further comprising:

a capacitor element connected to the thermoelectric element, and configured to store the power generated by the thermoelectric element; and

a switching element connected to the capacitor element in series and configured to be turned on and off under control of the controller.

14. The aerosol generating device of claim 13 ,

wherein the controller is further configured to turn on and off the switching element based on the at least one of the heating time of the heater, the heating temperature of the heater, and the charge level of the battery.

15. The aerosol generating device of claim 13 , further comprising

a regulator circuit connected between the thermoelectric element and the capacitor element, and configured to stabilize a current output from the thermoelectric element.