Heater for aerosol-forming substrate comprising positive temperature coefficient thermistor
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A thermistor, aerosol generation technology, applied in the direction of ohmic resistance heating, ohmic resistance heating circuit diagram, thermometer, etc., can solve the problems of slow thermal response of resistance heating elements, difficult to avoid potential overheating, etc.
Pending Publication Date: 2022-07-29
PHILIP MORRIS PROD SA
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However, adjusting the temperature of a resistive heating element to provide a desired heating profile can be difficult because the resistive heating element can exhibit a slow thermal response
It may also be difficult to avoid potential overheating without providing additional components
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[0132] figure 1 The temperature T / resistance R graph of a PTC thermistor included in the heating element of the heater for heating the aerosol-forming substrate is shown.
[0133] When current is supplied to the PTC thermistor, the PTC thermistor is heated. When heating the PTC thermistor, the temperature T and resistance R of the PTC thermistor are based on figure 1 function shown in .
[0134] In particular, the PTC thermistor can be heated to a temperature TMR corresponding to the minimum resistance MR of the PTC thermistor.
[0135] When the PTC thermistor is heated to a temperature T lower than the temperature corresponding to the minimum resistance TMR, the resistance R of the PTC thermistor is based on figure 1 A function of decreases slightly as the temperature T of the PTC thermistor increases. In some PTC thermistors, the resistance R of the PTC thermistor remains substantially constant, at a resistance slightly higher than the minimum resistance MR of the PTC th...
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Abstract
A heater (10) for heating an aerosol-forming substrate. The heater (10) comprises a heating element configured to heat an aerosol-forming substrate, the heating element comprising at least one PTC thermistor (24, 25, 260, 261, 262, 263, 264, 265, 27). The resistance of the at least one PTC thermistor (24, 25, 260, 261, 262, 263, 264, 265, 27) increases when the temperature of the at least one PTC thermistor (24, 25, 260, 261, 262, 263, 264, 265, 27) increases within a stable temperature range. The lower end of the stable temperature range is a reference temperature (CT) at which the resistance of the at least one PTC thermistor (24, 25, 260, 261, 262, 263, 264, 265, 27) is twice the minimum resistance value of the at least one PTC thermistor (24, 25, 260, 261, 262, 263, 264, 265, 27).
Description
technical field [0001] The present invention relates to heaters for heating aerosol-forming substrates, aerosol-generating devices and aerosol-generating systems comprising such heaters. Background technique [0002] Aerosol-generating articles are known in the art in which an aerosol-forming substrate, such as a tobacco-containing substrate, is heated rather than burned. The purpose of this heated aerosol-generating article is to reduce potentially harmful by-products produced by the combustion and pyrolytic degradation of tobacco in conventional cigarettes. [0003] In heated aerosol-generating articles, the respirable aerosol is typically generated by transferring heat from a heater to the aerosol-forming substrate. During heating, volatile compounds are released from the aerosol-forming matrix and entrained in the air. For example, volatile compounds can be entrained in air drawn through, over, around, or otherwise within the vicinity of the aerosol-generating article....
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