Patent Application
20250082037
The present disclosure relates to the field of novel tobacco technologies, and in particular, to a method for controlling the temperature of a heating apparatus in an electrically-heated smoking system and an electrically-heated smoking system.
The heating apparatus in an electrically-heated smoking appliance is the key part of the whole appliance. Controlling of the temperature of the heating apparatus in the heating non-burning electrically-heated smoking appliance is of great significance in reducing the volatilization of harmful substances during heating the tobacco tar and the low-temperature cigarette tobacco, enhancing the user experience of the electrically-heated smoking appliance, cleaning the heating element and prolonging the lifetime of the electrically-heated smoking appliance, etc.
At present, the temperature control methods of the heating apparatus in the electrically-heated smoking system mainly include: directly adjusting the voltage value at the two ends of the heating apparatus, inputting the current value of the heating apparatus or outputting power of the heating apparatus, thereby controlling the temperature of the heating apparatus; detecting the resistivity of the heating apparatus, and controlling the temperature of the heating apparatus according to the correspondence between the resistivity and the temperature, thereby controlling the temperature of the heating apparatus, etc.
For the temperature control methods of the heating apparatus by directly controlling the voltage value at the two ends of the heating apparatus and the input current value or by controlling the power output of the heating apparatus, the temperature of the heating apparatus cannot be accurately controlled, because the temperature of the heating apparatus and the temperature fluctuation ratio thereof cannot be accurately mastered, especially after the heating apparatus contacts an object to be heated, the specific gravity, heat capacity, volume and consuming behavior of the heating object will affect the temperature of the heating apparatus, thereby causing a deviation to the preset temperature control program.
For the detection of the resistivity of the heating apparatus, the temperature of the heating apparatus is controlled according to the relationship between the resistivity and the temperature. This method is greatly affected by the stability of the resistance of the heating element. Due to the constant aging of the heating element, the relationship between the resistivity and the temperature has a deviation, which may lead to distortion of temperature control and cannot accurately control the temperature of the heating apparatus.
Therefore, it is an object of the present disclosure to overcome the above defects, i.e., the technical problems of the existing method for controlling the temperature of a heating apparatus in an electrically-heated smoking system that the temperature of the heating apparatus cannot be controlled accurately.
In a first aspect, the disclosure provides a method for controlling the temperature of a heating apparatus in an electrically-heated smoking system. The electrically-heated smoking system includes: a constant current source, a power supply for supplying electric power to a heating apparatus, and a heating apparatus connected with the power supply. The method for controlling the heating apparatus according to the disclosure includes: providing a preset temperature value, which may be a constant or may change over time; outputting, by the constant current source, a constant current I0 to the heating apparatus; and controlling an actual temperature of the heating apparatus to be maintained at a preset temperature, which includes the steps of:
In an embodiment according to the present disclosure, the numerical value of the constant current I0 is no larger than 50 mA.
Optionally, the deriving the actual temperature value of the heating apparatus includes retrieving the temperature value from a correspondence table between the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus and the actual temperature value of the heating apparatus, or obtaining the actual temperature value of the heating apparatus according to a function relation formula between the actual temperature of the heating apparatus and the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus.
In an embodiment according to the present disclosure, a function relation formula between the actual temperature of the heating apparatus and the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus is T=a*U0+b, where T is the temperature of the heating apparatus, U0 is the voltage corresponding to the constant current source, and a, b are constants related to a specific heating apparatus. Further, the parameter a is 1/(c*I0), and the parameter b is R0/c, where the parameter c is a resistance temperature coefficient of a specific heating apparatus, and R0 is an initial resistance of a specific heating apparatus.
Optionally, the preset temperature value may be set constant or may be set to change over time, and preferably, the preset temperature value is set to change over time and has a temperature curve that changes over time.
In an embodiment according to the present disclosure, the preset temperature curve of the heating apparatus includes three stages: the first stage is a stage in which the temperature of the heating apparatus rises from an initial temperature to a maximum temperature; the second stage is a stage in which the temperature of the heating apparatus decreases from the maximum temperature to a working temperature; and the third stage is a stage in which the temperature of the heating apparatus keeps at the working temperature.
In an embodiment according to the present disclosure, the maximum temperature is between 350 to 450° C., and the working temperature is between 280 to 380° C.
In an embodiment according to the present disclosure, the duration of the first stage is 1-25 s, the duration of the second stage is 1-25 s, and the duration of the third stage is 120-600s.
In an embodiment according to the present disclosure, the control method and control steps are repeated during the heating process of the heating apparatus of electrically-heated smoking system so as to adjust the actual working temperature of the heating apparatus and maintain it at the preset temperature.
In an embodiment according to the present disclosure, the control steps according to the disclosure are executed at a frequency of about 50 Hz-9000 Hz during the power supplying process.
In a second aspect, the disclosure provides an electrically-heated smoking system, which includes a heating apparatus, a constant current source, a detection module, a temperature derivation module, a central control chip and a power controller.
The heating apparatus according to the disclosure is configured for heating a smoke-forming matrix in various forms, for example, tobacco and tobacco tar. Optionally, the heating apparatus may have any suitable number and form. For example, the number of the heating apparatus may be more than one, and the suitable shape includes, but is not limited to, needle, splinter and taper.
The constant current source according to the disclosure is configured for outputting a constant current to the heating apparatus.
The detection module according to the disclosure is configured for determining a voltage U0 corresponding to the constant current at the two ends of the heating apparatus according to the constant current input, and feeding back the value to the temperature derivation module.
The temperature derivation module according to the disclosure is configured for receiving the voltage value corresponding to the constant current at the two ends of the heating apparatus, and deriving the actual temperature of the heating element, and feeding back the actual temperature value to the central control chip.
Optionally, the detection module and/or the temperature derivation module may be independent from the central control chip, or may be partially or entirely integrated in the central control chip.
Optionally, a correspondence table between the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus and the actual temperature value of the heating apparatus or a correspondence function formula between the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus and the actual temperature value of the heating apparatus is stored on the temperature derivation module.
In an embodiment according to the present disclosure, a function relation formula between the actual temperature of the heating apparatus and the voltage value U0 corresponding to the constant current at the two ends of the heating apparatus is T=a*U0+b, where T is the temperature of the heating apparatus, U0 is the voltage corresponding to the constant current source, and a, b are constants related to a specific heating apparatus. Further, the parameter a is 1/(C*I0), and the parameter b is R0/c, wherein the parameter c is a resistance temperature coefficient of a specific heating apparatus, and R0 is an initial resistance of a specific heating apparatus.
The central control chip according to the disclosure is configured for: controlling the constant current source to output a constant current to the heating apparatus and in real time detect and control the signal fed back by the constant current source; receiving the actual temperature value of the heating apparatus from the temperature derivation module, and comparing the actual temperature value of the heating apparatus with a preset temperature value; and controlling the power controller. Optionally, the central control chip may employ any suitable form that is common in the art.
A preset temperature value is stored in the central control chip. Optionally, the preset temperature value may be set constant or may be set to change over time, and preferably, the preset temperature value is set to change over time and have a temperature curve that changes over time. Further, the duration and related temperature value of each stage in the temperature curve are stored in the central control chip.
In an embodiment according to the present disclosure, the temperature curve includes three stages: the first stage is a stage in which the temperature of the heating apparatus rises from an initial temperature to a maximum temperature; the second stage is a stage in which the temperature of the heating apparatus decreases from the maximum temperature to a working temperature; and the third stage is a stage in which the temperature of the heating apparatus keeps at the working temperature.
In an embodiment according to the present disclosure, the maximum temperature is between 350 to 450° C., the working temperature is between 280 to 380° C., the duration of the first stage is 1-25 s, the duration of the second stage is 1-25 s, and the duration of the third stage is 120-600 s.
In an embodiment according to the present disclosure, a plurality of preset temperature values are stored on the central control chip to be easily selected by a consumer.
The power controller according to the disclosure is configured for adjusting an electric power provided to the heating apparatus so as to maintain the actual temperature value of the heating apparatus at a preset temperature.
In the first aspect and the second aspect of the disclosure, the heating apparatus may include any suitable resistance material. The suitable resistance material includes, but is not limited to: cermet heater, conductive ceramic, nickel-containing alloy, cobalt-containing alloy, chrome-containing alloy, aluminium-containing alloy, titanium-containing alloy, zirconium-containing alloy, hafnium-containing alloy, columbium-containing alloy, molybdenum-containing alloy, tantalum-containing alloy, tungsten-containing alloy, tin-containing alloy, gallium-containing alloy, manganese-containing alloy and iron-containing alloy. Preferably, the resistance material included in the heating apparatus includes tungsten, manganese and an additive, and the additive is at least one selected from molybdenum, ruthenium, tellurium, germanium and vanadium.
In conclusion, in the disclosure, a constant current source is added to the control circuit, and the constant current source can output a constant current to the heating apparatus. A unique actual working temperature value is obtained according to the correspondence between the actual working temperature of the specific heating apparatus and the above voltage by determining the voltage corresponding to the constant current at the two ends of the heating apparatus, so that the electric power provided by the power supply may be adjusted according to the comparison result with the preset temperature, thereby controlling and finally maintaining the actual working temperature of the heating apparatus at the preset temperature. When the disclosure is applied to the field of novel tobacco technologies, the temperature of the heating apparatus may be accurately controlled according to a preset temperature, and the control precision can be greatly improved, so that volatilization of harmful substances in the tobacco may be controlled, and a user of the electrically-heated smoking system can obtain a stable suction taste and a good suction experience, thereby prolonging the lifetime of the electrically-heated smoking system.
The drawings are provided for further understanding the disclosure and form a part of the disclosure, and the drawings are used for explaining the disclosure in conjunction with the specific embodiments below, rather than limiting the disclosure. In the drawings:
The temperature derivation module feeds back the actual temperature of the heating apparatus to the central control chip in real time, and the central control chip compares the actual temperature of the heating apparatus at this moment with the preset temperature at this moment stored inside, if the former is greater than the latter, the central control chip lowers the electric power output of the power supply by controlling the power controller, so as to lower the temperature of the heating apparatus; if the former is smaller than the latter, the central control chip increases the electric power output of the power supply by controlling the power controller, so as to rise the temperature of the heating apparatus. By repeating the above control method and steps, the actual working temperature of the heating apparatus may be controlled and maintained at the preset temperature.
In one embodiment, t1 is set as 17 s, the maximum temperature T1 is set as 390° C., t2 is set as 3 s, the working temperature T0 is set as 360° C., and t3 is set as 250 s.
Preferred embodiments have been described in detail above. However, the disclosure is not limited to the specific details of the above embodiments, and within the technical concept of the disclosure, various simple variations may be made to the technical solutions of the disclosure, and all these variations pertain to the protection scope of the disclosure.
Additionally, it should be noted that, in the case of no conflict, each specific technical feature described in the above specific embodiments may be combined in any appropriate manner, and in order to avoid unnecessary repetition, said various possible combinations will not be further illustrated in the disclosure.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17261885 | Jul 2021 | US |
| Child | 18634914 | US |
