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EP-4316285-B1 - INDUCTION HEATING DEVICE

EP4316285B1EP 4316285 B1EP4316285 B1EP 4316285B1EP-4316285-B1

Inventors

  • FUJITA, HAJIME

Dates

Publication Date
20260506
Application Date
20220329

Claims (9)

  1. An induction heating device (100) for heating an aerosol forming base substance (108), which comprises a susceptor (110) and an aerosol source (112), comprising: a circuit (104) comprising a coil (106) for heating the susceptor (110) by induction heating; characterized in that the susceptor (110) is heated by using a heating mode comprising plural phases, and a frequency of AC current supplied to the coil (106) over the plural phases is constant.
  2. The induction heating device (100) as recited in Claim 1, wherein the frequency of the AC current is a resonance frequency of the circuit (104).
  3. The induction heating device (100) as recited in Claim 1 or 2, wherein, in an interval mode, that is performed before the heating mode, for cooling the susceptor (110) after the susceptor (110) is preheated, the frequency of the AC current is a resonance frequency of the circuit (104).
  4. The induction heating device (100) as recited in Claim 3 comprising: an electric power source; wherein the circuit (104) further comprises a parallel circuit which comprises a first circuit and a second circuit arranged in parallel in positions between the electric power source and the coil (106), and the first circuit is used for heating the susceptor (110), and the second circuit is used for obtaining a value relating to electric resistance or temperature of the susceptor (110), and the second circuit is used in the interval mode.
  5. The induction heating device (100) as recited in Claim 1, wherein, in the heating mode, if it is judged that the temperature of the susceptor (110) has become equal to or higher than predetermined temperature, heating of the susceptor (110) is interrupted.
  6. The induction heating device (100) as recited in Claim 5 comprising: an electric power source; wherein the circuit (104) further comprises a parallel circuit which comprises a first circuit and a second circuit arranged in parallel in positions between the electric power source and the coil (106), and the first circuit is used for heating the susceptor (110), and the second circuit is used for obtaining a value relating to electric resistance or temperature of the susceptor (110), and the temperature of the susceptor (110) is monitored by using the second circuit, during time when heating of the susceptor (110) is being interrupted.
  7. The induction heating device (100) as recited in Claim 6, wherein, in the heating mode, if it is judged that the temperature of the susceptor (110) has become lower than the predetermined temperature, heating of the susceptor (110) is restarted by using the first circuit.
  8. The induction heating device (100) as recited in Claim 6, wherein, in the heating mode, if it is judged that the temperature of the susceptor (110) has become lower than temperature that is lower than the predetermined temperature by predetermined degrees of temperature, heating of the susceptor (110) is restarted by using the first circuit.
  9. The induction heating device (100) as recited in any one of Claims 6-8, wherein the circuit (104) further comprises an AC generation circuit which is arranged in a position between the parallel circuit and the coil (106) or between the parallel circuit and the electric power source, and the AC generation circuit comprises a third switch, and the third switch is switched according to a predetermined cycle even in time when heating of the susceptor (110) is being interrupted.

Description

TECHNICAL FIELD The present disclosure relates to an induction heating device for heating an aerosol forming base substance for generating aerosol. BACKGROUND ART In prior art, a device which generates aerosol from an aerosol forming base substance comprising a susceptor, by heating the susceptor with induction heating, by using an inductor arranged in a position close to the aerosol forming base substance, has been know (Patent Literatures 1-3). An aerosol-generating device is known and comprises: an inductive heating arrangement configured to heat an aerosol-forming substrate, the inductive heating arrangement comprising: a susceptor arrangement that is heatable by penetration with a varying magnetic field to heat the aerosol-forming substrate; a first LC circuit, the first LC circuit at least comprising a first inductor coil and a first capacitor, wherein the first LC circuit has a first resonance frequency; and a second LC circuit, the second LC circuit at least comprising a second inductor coil and a second capacitor, wherein the second LC circuit has a second resonance frequency different from the first resonance frequency of the first LC circuit. An aerosol-generating system comprising the aerosol-generating device and an aerosol-generating article comprising an aerosol-forming substrate (Patent Literature 4, which is considered as the closest prior art). A liquid reservoir component of an electronic vaping device is known and includes an outer casing extending in a longitudinal direction, an air inlet, and a vapor outlet. An inner tube is within the outer casing defining a central air passage communicates with the inlet and the outlet. A liquid reservoir is in an annular space between the outer casing and the inner tube. A susceptor is adjacent the central air passage, and a wick is in communication with the liquid reservoir and in thermal communication with the susceptor such that the susceptor is operable to heat the liquid material to a temperature to vaporize the liquid material and form a vapor in the central air passage. The liquid reservoir component is configured to connect with a power supply component such that an induction source is operable to generate an inductive field to heat the susceptor when powered by the power source. (Patent Literature 5). CITATION LIST PATENT LITERATURE PTL 1: JP 6 623 175 APTL 2: JP 6 077 145 APTL 3: JP 6 653 260 APTL 4: EP 3 760 065 A1PTL 5: US 9 888 719 B2 SUMMARY OF INVENTION TECHNICAL PROBLEM A first object, that is to be attained by the present disclosure, is to provide an improved induction heating device for heating an aerosol forming base substance for generating aerosol. A second object, that is to be attained by the present disclosure, is to provide an induction heating device which can automatically start heating of an aerosol forming base substance. A third object, that is to be attained by the present disclosure, is to provide an induction heating device which can respond to removal of an aerosol forming base substance. A fourth object, that is to be attained by the present disclosure, is to provide an induction heating device which can perform heating of an aerosol forming base substance more appropriately. SOLUTION TO PROBLEM The technical problem is solved by the subject-matter of the independent claim 1. The dependent claims relate to further embodiments of the present invention, and this description explains how the present invention may be carried out. For achieving the above-explained first object, according to an embodiment of the present disclosure, an induction heating device for heating an aerosol forming base substance, which comprises a susceptor and an aerosol source, is provided, wherein the induction heating device comprises: an electric power source; a coil for heating the susceptor by induction heating; a parallel circuit which comprises a first circuit and a second circuit arranged in parallel in positions between the electric power source and the coil, wherein the first circuit is used for heating the susceptor, and the second circuit is used for obtaining a value relating to electric resistance or temperature of the susceptor; and an AC generation circuit which is arranged in a position between the parallel circuit and the coil or between the parallel circuit and the electric power source. In the embodiment, the AC generation circuit is arranged in a position between the parallel circuit and the coil, and the AC generation circuit comprises a third switch. In the embodiment, the third switch comprises a MOSFET. In the embodiment, the first circuit comprises a first switch, the AC generation circuit comprises a third switch, and, when the third switch is being switched according to a predetermined cycle, the first switch maintains an ON state. In the embodiment, each of the first switch and the third switch comprises a MOSFET. In the embodiment, the second circuit comprises a second switch, the AC generation circuit comprises a