METHOD FOR CONTROLLING TEMPERATURE OF HEAT-GENERATING COMPONENT OF ELECTRICALLY HEATED VAPOR-GENERATING SYSTEM AND ELECTRICALLY HEATED VAPOR-GENERATING SYSTEM

Abstract

Disclosed are a method for controlling the temperature of a heating apparatus in an electrically-heated smoking system and an electrically-heated smoking system, the method includes: providing a constant or variable preset temperature value; outputting a constant current to a heating apparatus by a constant current source; and controlling an actual temperature of the heating apparatus to be maintained at a preset temperature, wherein the temperature control step comprises: obtaining a voltage value corresponding to the constant current at the two ends of the electrical heating apparatus; deriving the actual temperature value of the heating apparatus according to the voltage value; comparing the actual temperature value of the heating apparatus with the preset temperature; and maintaining the actual temperature value of the heating apparatus at the preset temperature by adjusting a heating power supply.

Claims

1. A method for controlling a temperature of a heating apparatus in an electrically-heated smoking system, the electrically-heated smoking system comprising 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 comprising: providing a preset temperature value, wherein the preset temperature value is a constant or changes over time; outputting, by the constant current source, a constant current I.sub.0 to the heating apparatus; and controlling an actual temperature of the heating apparatus to be maintained at a preset temperature, wherein the controlling comprises the steps of: determining a voltage value U.sub.0 corresponding to the constant current I.sub.0 at the-two ends of the heating apparatus; determining the actual temperature value T of the heating apparatus according to the voltage value U.sub.0 corresponding to the constant current at the two ends of the heating apparatus; comparing the actual temperature value T of the heating apparatus with the preset temperature; and adjusting an electric power provided to the heating apparatus to maintain the actual temperature value T of the heating apparatus at the preset temperature.

2. The method of claim 1, wherein a numerical value of the constant current I.sub.0 is no larger than 50 mA.

3. The method of claim 1, wherein the actual temperature value is derived in one of two modes below: retrieving a temperature value from a correspondence table between the voltage value U.sub.0 corresponding to the constant current at the two ends of the heating apparatus and the actual temperature value of the heating apparatus; and 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 U.sub.0 corresponding to the constant current at the two ends of the heating apparatus.

4. The method of claim 3, wherein, the function relation formula is T=a*U.sub.0+b, wherein T is a temperature of the heating apparatus, U.sub.0 is a voltage corresponding to the constant current source, and a and b are parameters related to a specific heating element.

5. The method of claim 4, wherein the parameter a is 1/(c*I.sub.0), and the parameter b is R.sub.0/c, wherein, c is a resistance temperature coefficient of the specific heating apparatus, and R.sub.0 is an initial resistance of the specific heating apparatus.

6. The method of claim 1, wherein the preset temperature value has a temperature curve that changes over time.

7. The method of claim 6, wherein the temperature curve comprises three stages: a first stage is a stage in which the temperature of the heating apparatus rises from an initial temperature to a maximum temperature; a second stage is a stage in which the temperature of the heating apparatus decreases from the maximum temperature to a working temperature; and a third stage is a stage in which the temperature of the heating apparatus keeps at the working temperature.

8. The method of claim 7, wherein the maximum temperature is between 350 to 450° C., and the working temperature is between 280 to 380° C.

9. The method of claim 7, wherein a duration of the first stage is 1-25 s, a duration of the second stage is 1-25 s, and a duration of the third stage is 120-600 s.

10. An electrically-heated smoking system, comprising: a heating apparatus; a constant current source, configured for outputting a constant current I.sub.0 to a heating apparatus; a detection module, configured for determining a voltage U.sub.0 corresponding to the constant current at two ends of the heating apparatus and feeding back a value to a temperature derivation module; a temperature derivation module, configured for receiving a value of the voltage U.sub.0 corresponding to the constant current at the two ends of the heating apparatus and deriving an actual temperature of the heating element, and feeding back the actual temperature value to a central control chip; a central control chip, configured for: controlling the constant current source to output the constant current to the heating apparatus and in real time detect and control a signal fed back by the constant current source; and 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 a power controller; a power controller, configured for adjusting an electric power provided to the heating apparatus to maintain the actual temperature value of the heating apparatus at the preset temperature.

11. The system of claim 10, wherein a correspondence table between the voltage value U.sub.0 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 U.sub.0 corresponding to the constant current at the two ends of the heating apparatus and the actual temperature value of the heating apparatus is stored in the temperature derivation module.

12. The system of claim 11, wherein the function relation formula is T=a*U.sub.0+b, wherein, T is a temperature of the heating apparatus, U.sub.0 is a voltage corresponding to the constant current source, and a and b are parameters related to a specific heating element.

13. The system of claim 12, wherein the parameter a is 1/(C*I.sub.0), and the parameter b is R.sub.0/c, wherein, c is a resistance temperature coefficient of the specific heating apparatus, and R.sub.0 is an initial resistance of the specific heating apparatus.

14. The system of claim 10, wherein the preset temperature value is stored in the central control chip, and the preset temperature value is a constant or changes over time.

15. The system of claim 14, wherein the preset temperature value has a temperature curve that changes over time.

16. The system of claim 15, wherein the temperature curve comprises three stages: a first stage is a stage in which the temperature of the heating apparatus rises from an initial temperature to a maximum temperature; a second stage is a stage in which the temperature of the heating apparatus decreases from the maximum temperature to a working temperature; and a third stage is a stage in which the temperature of the heating apparatus keeps at the working temperature.

17. The system of claim 16, wherein the maximum temperature is between 350 to 450° C., and the working temperature is between 280 to 380° C.

18. The system of claim 16, wherein a duration of the first stage is 1-25 s, a duration of the second stage is 1-25 s, and a duration of the third stage is 120-600 s.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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:

[0038] FIG. 1 is a schematic diagram illustrating a method for controlling the temperature of a heating apparatus according to an embodiment of the present disclosure; and

[0039] FIG. 2 is a temperature change curve illustrating preset temperature values stored in a central control chip according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] FIG. 1 shows a schematic diagram of a method for controlling the temperature of a heating apparatus and an electrically-heated smoking system according to an embodiment of the disclosure. In the embodiment, the electrically-heated smoking system includes: a central control chip, a constant current source, a heating apparatus, a detection module, a temperature derivation module and a power controller. Wherein, the central control chip controls the constant current source to output a constant current I.sub.0 to a heating apparatus and in real time detect and control the signal fed back by the constant current source, thereby controlling the constant current source to work stably. The detection module determines a voltage U.sub.0 corresponding to the above constant current I.sub.0 at the two ends of the heating apparatus in real time according to U.sub.0=I.sub.0*R in accordance with the constant current input, and feeds back the value of voltage U.sub.0 to the temperature derivation module. The temperature derivation module calculates the actual temperature of the heating apparatus at this moment according to function relation formula T=a*U.sub.0+b. Wherein, R is the real-time resistance of the heating apparatus, T is the temperature of the heating apparatus, and U.sub.0 is the voltage corresponding to the constant current I.sub.0, and a, b are constants related to a specific heating apparatus. Further, the parameter a is 1/(C*I.sub.0), and the parameter b is R.sub.0/c, wherein, the parameter c is a resistance temperature coefficient of a specific heating apparatus, R.sub.0 is the initial resistance of a specific heating apparatus. In one embodiment, the constant current I.sub.0 is set as 10 mA, the resistance temperature coefficient of the specific heating apparatus is 4000 ppm/° C., and the initial resistance is 1 ohm.

[0041] 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.

[0042] FIG. 2 shows a temperature change curve of preset temperature values stored in a central control chip according to an embodiment. In the first stage, the temperature of the heating apparatus rises within time t.sub.1 from the initial temperature to the maximum temperature T.sub.1, wherein t.sub.1 is in the range of 1-25 s, and the maximum temperature T.sub.1 is in the range of 350-450° C. In the second stage, the temperature of the heating apparatus decreases from the maximum temperature to the working temperature T.sub.0 in time t.sub.2, wherein t.sub.2 is in the range of 1-25 s, the working temperature T.sub.0 is in the range of 280-380° C. and is lower than the maximum temperature T.sub.1. In the third stage, the temperature of the heating apparatus is maintained at the working temperature T.sub.0 in time t.sub.3 till the end of power supplying, and t.sub.3 is in the range of 120-600 s.

[0043] In one embodiment, t1 is set as 17 s, the maximum temperature T.sub.1 is set as 390° C., t.sub.2 is set as 3 s, the working temperature T.sub.0 is set as 360° C., and t.sub.3 is set as 250 s.

[0044] 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.

[0045] 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.