System for controlling a smoking substitute device
A system for controlling a smoking substitute device having a heating element. The system comprises a receiver module configured to receive a periodic signal. The periodic signal is in the form of a series of signal events. The system also comprises a sensor configured to determine a temperature of the heating element in response to the receipt of a signal event of the periodic signal by the receiver module, and a controller. If the determined temperature is below a predetermined threshold, the controller is configured to cause power to be supplied to the heating element for a heating period, the heating period being shorter than or equal to the period of the periodic signal.
1 . A system for controlling a smoking substitute device having a heating element, the system comprising:
a receiver module configured to receive a periodic signal, the periodic signal being in the form of a series of signal events;
a sensor configured to determine a temperature of the heating element in response to the receipt of a signal event of the periodic signal by the receiver module; and
a controller, wherein:
if the determined temperature is below a predetermined threshold, the controller is configured to cause power to be supplied to the heating element for a heating period, the heating period being shorter than or equal to the period of the periodic signal.
2 . A system according to claim 1 , wherein if the determined temperature is above the predetermined threshold, the controller is configured to cause power not to be supplied to the heating element.
3 . A system according to claim 1 , wherein the sensor is configured to determine the temperature of the heating element only at each signal event of the periodic signal.
4 . A system according to claim 1 , wherein the controller is configured to cause power to be supplied to the heating element if the determined temperature is less than the predetermined threshold minus a pre-set temperature value.
5 . A system according to claim 4 , wherein the smoking substitute device further comprises an aerosol-former to be heated by the heating element, and the pre-set temperature value is a device intrinsic parameter based on a dead time and a time constant of the aerosol-former.
6 . A system according to claim 1 , wherein the period of the periodic signal is constant.
7 . A system according to claim 1 , wherein the period of the periodic signal is variable.
8 . A system according to claim 1 , wherein the period of the periodic signal is in the range of 1 ms-1000 ms.
9 . A system according to claim 1 , wherein a duty cycle of the periodic signal is the ratio of ON and OFF periods for each period of the periodic signal, and wherein the duty cycle of the periodic signal is constant.
10 . A system according to claim 1 , wherein a duty cycle of the periodic signal is the ratio of ON and OFF periods for each period of the periodic signal, and wherein the duty cycle of the periodic signal is variable.
11 . A system according to claim 1 , wherein the receiver module is configured to receive the periodic signal from a microcontroller disposed in the smoking substitute device.
12 . A system according to claim 1 , wherein if the determined temperature is below the predetermined threshold, the controller is configured to cause the supply of power to the heating element within 100 μs of the signal event of the periodic signal.
13 . A system according to claim 1 , wherein the sensor is a resistance sensor.
14 . A method for controlling a smoking substitute device having a heating element, the method comprising:
receiving a periodic signal, the periodic signal being in the form of a series of signal events;
determining, by a sensor, the temperature of the heating element in response to the receipt of a signal event of the periodic signal;
comparing the determined temperature with a predetermined threshold; and
if the determined temperature is below the predetermined threshold, supplying power to the heating element for a heating period, wherein the heating period is shorter than or equal to the period of the periodic signal.
15 . A method according to claim 14 , wherein the method further comprises, if the determined temperature is above the predetermined threshold, preventing the supply of power to the heating element.