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1. WO2020193175 - SYSTÈME DE SUBSTITUTION À L'ACTE DE FUMER

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS:

1. A heated tobacco device comprising:

a power source;

a heater; and

a printed circuit board (PCB) comprising a power layer connected to the power source, a ground layer, a top layer and a bottom layer.

2. A device according to claim 1 , further comprising a voltage regulator to regulate the voltage supplied by the power source to a regulated voltage value at an output of the voltage regulator.

3. A device according to claim 2, wherein the power layer is connected to the output of the voltage regulator.

4. A device according to any one of the preceding claims comprising a first heater control transistor configured to control the supply of power to the heater from the power source.

5. A device according to claim 4 further comprising a second heater control transistor connected in series with the first transistor, the second transistor configured to control the supply of power to the heater from the power source.

6. A device according to claim 5, wherein the first and second transistors are on the return path from the heater to the power source.

7. A device according to any one claims 4 to 6, further comprising a controller connected to a first drive input of the first transistor and a second drive input of the second transistor.

8. A device according to claim 7, wherein the first drive input and the second drive input are

connected to the same output of the controller.

9. A device according to claim 7, wherein the first drive input and the second drive input are

connected to different outputs of the controller.

10. A device according to any one of the preceding claims, wherein the heater comprises a heating track and the PCB comprises a heater analog-to-digital converter (HADC) connected to the heater, the controller configured to identify a short circuit in the heating track of the heater using the input to the HADC.

11. A device according to any one of the preceding claims, wherein the heater comprises a

temperature sensing track for sensing a temperature of the heater, the PCB comprising a

temperature sensing analog-to-digital converter (TSADC) connected to the temperature sensing track.

12. The device according to claim 1 1 , wherein the controller is configured to determine the

temperature of the temperature sensing track using the input to the TSADC.

13. A device according to claim 1 1 or 12 wherein the controller is configured to determine if the impedance of the temperature sensing track is outside a predetermined operating range, and to prevent power supply to the heater if the impedance is outside the predetermined operating range.