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Application US20200154787
Published 2020-05-21
Temperature Control In An Aerosol Delivery Device
An aerosol delivery device is provided that includes a power source, a heating element, a switch coupled to and between the power source and the heating element, and processing circuitry coupled to the switch. The processing circuitry outputs a PWM signal during a heating time period to cause the switch to switchably connect and disconnect the output voltage to the heating element to power the heating element. The processing circuitry outputs a pulse of known current to the heating element, and measure voltage across the heating element, between adjacent pulses of the PWM signal. And the processing circuitry calculates the resistance of the heating element based on the known current and the voltage, calculates the temperature of the heating element based on the resistance, and adjusts a duty cycle of the PWM signal when the temperature deviates from a predetermined target.
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- 1. An aerosol delivery device comprising:
a power source configured to provide an output voltage; a heating element powerable to vaporize components of an aerosol precursor composition and thereby produce an aerosol, the heating element having a resistance that is variable and proportional to a temperature of the heating element; a switch coupled to and between the power source and the heating element; and processing circuitry coupled to the switch, and configured to output a pulse-width modulation (PWM) signal during a heating time period to cause the switch to switchably connect and disconnect the output voltage to the heating element to power the heating element, the PWM signal including pulses over which the output voltage to the heating element is connected, and between which the output voltage to the heating element is disconnected, wherein the processing circuitry is further configured to output a pulse of known current to the heating element, and measure voltage across the heating element, between adjacent pulses of the PWM signal, and wherein the processing circuitry is configured to calculate the resistance of the heating element based on the known current and the voltage, calculate the temperature of the heating element based on the resistance, and adjust a duty cycle of the PWM signal when the temperature deviates from a predetermined target.
- 7. An aerosol delivery device comprising:
a power source configured to provide an output voltage; a heating element powerable to vaporize components of an aerosol precursor composition and thereby produce an aerosol; a switch coupled to and between the power source and the heating element; and processing circuitry coupled to the switch, and configured to output a pulse-width modulation (PWM) signal during a heating time period to cause the switch to switchably connect and disconnect the output voltage to the heating element to power the heating element, the PWM signal including pulses over which the output voltage to the heating element is connected, and between which the output voltage to the heating element is disconnected, wherein the processing circuitry is further configured to calculate a quantity of heat at the heating element during the heating time period, and execute a lockout of the heating element when the quantity of heat at the heating element is greater than a threshold quantity of heat.
- 13. A method of controlling an aerosol delivery device including a power source configured to provide an output voltage, and a heating element powerable to vaporize components of an aerosol precursor composition and thereby produce an aerosol, the heating element having a resistance that is variable and proportional to a temperature of the heating element, the method comprising:
switchably connecting and disconnecting the output voltage to the heating element to power the heating element according to a pulse-width modulation (PWM) signal, the PWM signal including pulses over which the output voltage to the heating element is connected, and between which the output voltage to the heating element is disconnected; outputting a pulse of known current to the heating element, and measuring voltage across the heating element, between adjacent pulses of the PWM signal; calculating the resistance of the heating element based on the known current and the voltage; calculating the temperature of the heating element based on the resistance; and adjusting a duty cycle of the PWM signal when the temperature deviates from a predetermined target.
- 19. A method of controlling an aerosol delivery device including a power source configured to provide an output voltage, and a heating element powerable to vaporize components of an aerosol precursor composition and thereby produce an aerosol, the method comprising:
switchably connecting and disconnecting the output voltage to the heating element to power the heating element according to a pulse-width modulation (PWM) signal, the PWM signal including pulses over which the output voltage to the heating element is connected, and between which the output voltage to the heating element is disconnected; calculating a quantity of heat at the heating element during the heating time period; and executing a lockout of the heating element when the quantity of heat at the heating element is greater than a threshold quantity of heat.
