CN117782342A - Thermocouple temperature measurement method and electromagnetic heating aerosol generating device - Google Patents
Thermocouple temperature measurement method and electromagnetic heating aerosol generating device Download PDFInfo
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Abstract
The invention discloses a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device, which comprises the following steps: determining the total electromotive force fed back by the thermocouple in the magnetic field, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force; determining a calibration electromotive force based on the total electromotive force, wherein the calibration electromotive force comprises a thermoelectric electromotive force and does not comprise an induced electromotive force; the temperature of the heating body is determined according to the calibration electromotive force. According to the thermocouple temperature measuring method of the electromagnetic heating aerosol generating device, provided by the invention, the influence of a magnetic field is avoided, and the induced electromotive force fed back by the thermocouple in the magnetic field is removed, so that the temperature of a heating body in the aerosol generating device is conveniently and accurately measured by using a thermocouple sensor. The invention also provides an electromagnetic heating aerosol generating device.
Description
Technical Field
The invention relates to the field of temperature control and calibration optimization of electromagnetic heating aerosol generating devices, in particular to a thermocouple temperature measuring method of an electromagnetic heating aerosol generating device and the electromagnetic heating aerosol generating device.
Background
Electromagnetic heating technology has long been used in aerosol generating devices. In electromagnetic heating aerosol-generating devices, it is convenient to measure temperature using thermocouple sensor control and connection instrumentation, and thermocouple sensors are often used in temperature control and measurement temperature display. But the induced electromotive force generated by the thermocouple in the magnetic field affects the accuracy of the temperature detection value of the heating body in the aerosol-generating device.
Therefore, in the conventional electromagnetic heating aerosol generating device, the thermocouple sensor has the problem of inaccuracy in temperature control and calibration due to the influence of the alternating magnetic field.
Disclosure of Invention
The invention aims to solve the problem that in the conventional electromagnetic heating aerosol generating device, a thermocouple sensor is inaccurate in temperature control and calibration due to the influence of an alternating magnetic field.
In order to solve the technical problems, the embodiment of the invention discloses a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device, which comprises the following steps: determining the total electromotive force fed back by the thermocouple in the magnetic field, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force; determining a calibration electromotive force based on the total electromotive force, wherein the calibration electromotive force comprises a thermoelectric electromotive force and does not comprise an induced electromotive force; the temperature of the heating body is determined according to the calibration electromotive force.
By adopting the technical scheme, the thermocouple temperature measuring method of the electromagnetic heating aerosol generating device provided by the invention avoids the influence of a magnetic field, removes the induced electromotive force fed back by the thermocouple in the magnetic field, only retains the thermoelectric electromotive force of the thermocouple, and obtains the temperature difference of the heating body according to the thermoelectric electromotive force, so that the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating body in the aerosol generating device.
According to another embodiment of the invention, the electromagnetic heating aerosol generating device comprises a low-pass filter and a controller, wherein a thermocouple is connected with the input end of the low-pass filter, and the preset frequency of the low-pass filter is smaller than the working frequency of a coil of the magnetic field; determining a calibration electromotive force based on the total electromotive force, comprising: the low-pass filter removes the induced electromotive force from the total electromotive force and outputs a calibration electromotive force as a thermoelectromotive force.
According to another embodiment of the present invention, determining a calibration electromotive force based on a total electromotive force includes: acquiring the total electromotive force of a time domain fed back by the thermocouple in the magnetic field; converting the obtained total electromotive force of the time domain into the total electromotive force of the frequency domain; the amplitude at the frequency of 0Hz in the total electromotive force of the frequency domain is obtained as the calibration electromotive force.
According to another embodiment of the present invention, converting the obtained total electromotive force in the time domain into the total electromotive force in the frequency domain includes: the obtained total electromotive force of the time domain is converted into the total electromotive force of the frequency domain by fourier transform.
According to another embodiment of the present invention, obtaining the amplitude at the frequency of 0Hz in the total electromotive force in the frequency domain as the calibration electromotive force includes: acquiring the amplitude value of the frequency at 0Hz in the total electromotive force of the frequency domain as a calibration electromotive force; taking the calibration electromotive force as the temperature difference electromotive force of the frequency domain; the thermoelectromotive force of the frequency domain is converted into the thermoelectromotive force of the time domain.
According to another embodiment of the present invention, determining a calibration electromotive force based on a total electromotive force includes: acquiring the total electromotive force of a time domain fed back by the thermocouple in the magnetic field; converting the obtained total electromotive force of the time domain into the total electromotive force of the frequency domain; acquiring the amplitude of the frequency doubling part with the frequency being the coil working frequency in the total potential of the frequency domain as the induced electromotive force; the total electromotive force in the frequency domain is removed from the induced electromotive force to obtain a calibration electromotive force in the frequency domain; taking the calibration electromotive force as the temperature difference electromotive force of the frequency domain; and converting the thermoelectromotive force into the thermoelectromotive force of the time domain according to the thermoelectromotive force of the frequency domain.
According to another embodiment of the present invention, the conversion of the thermoelectromotive force according to the frequency domain into the thermoelectromotive force of the time domain includes: the acquired thermoelectromotive force of the frequency domain is converted into thermoelectromotive force of the time domain by inverse Fourier transform.
According to another embodiment of the invention, an electromagnetic heating aerosol generating device comprises a temperature measuring element other than a thermocouple; determining a calibration electromotive force based on the total electromotive force, comprising: acquiring the total electromotive force of a thermocouple in an electromagnetic heating working environment at the first time; the temperature measuring element is used for obtaining the accurate temperature of a heating body in an electromagnetic heating working environment at the first time, and the thermoelectric potential of the thermocouple is obtained according to the accurate temperature; obtaining an induced electromotive force according to the total electromotive force at the first time and the thermoelectromotive force at the first time; acquiring the total electromotive force of a thermocouple in an electromagnetic heating working environment in a calibration time; and obtaining the calibration electromotive force of the calibration time as the thermoelectric electromotive force according to the total electromotive force and the induced electromotive force of the calibration time.
According to another embodiment of the present invention, obtaining the thermoelectromotive force of the thermocouple according to the accurate temperature includes: and obtaining the thermoelectric potential of the thermocouple through the thermocouple graduation table according to the accurate temperature.
According to another embodiment of the present invention, determining a calibration electromotive force based on a total electromotive force includes: the temperature sampling frequency is adjusted to be larger than the current change frequency of the electromagnetic coil.
According to another embodiment of the invention, the temperature sampling frequency is adjusted to be at least 2 times the frequency of the current change of the electromagnetic coil.
The invention provides an electromagnetic heating aerosol generating device, comprising: a heating body for heating the aerosol-generating substrate; the signal input end of the thermocouple is connected with the heating body and is used for measuring the temperature of the heating body; the signal input end of the low-pass filter is connected with the signal output end of the thermocouple; the signal input end of the controller is connected with the signal output end of the low-pass filter; the processor is connected with the signal output end of the controller; the memory includes instructions that, when executed by the processor, cause the electromagnetic heating aerosol generating device to perform a thermocouple temperature measurement method as follows: determining the total electromotive force fed back by the thermocouple in the magnetic field, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force; determining a calibration electromotive force based on the total electromotive force, comprising: the low-pass filter removes the induced electromotive force in the total electromotive force and outputs a calibration electromotive force as a thermoelectromotive force, the calibration electromotive force including the thermoelectromotive force and excluding the induced electromotive force; the temperature of the heating body is determined according to the calibration electromotive force.
By adopting the technical scheme, the low-pass filter is arranged in the electromagnetic heating aerosol generating device, so that the low-frequency signal is allowed to pass, the influence of the high-frequency signal is deleted, namely the induced electromotive force of the thermocouple in electromagnetic heating is removed, the temperature difference electromotive force of the thermocouple is only reserved, and the temperature difference of the heating body is obtained according to the temperature difference electromotive force, and the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating body in the aerosol generating device.
The invention provides an electromagnetic heating aerosol generating device, comprising: a heating body for heating the aerosol-generating substrate; the signal input end of the thermocouple is connected with the heating body and is used for measuring the temperature of the heating body; the signal input end of the controller is connected with the signal output end of the thermocouple; the processor is connected with the signal output end of the controller; the memory comprising instructions that, when executed by the processor, cause the electromagnetic heating aerosol generating device to perform the thermocouple temperature measurement method of any of the foregoing embodiments.
By adopting the technical scheme, when the thermocouple in the electromagnetic heating aerosol generating device measures temperature, the induced electromotive force fed back by the thermocouple in the magnetic field is removed, the thermoelectric electromotive force of the thermocouple is only reserved, and the temperature difference of the heating body is obtained according to the thermoelectric electromotive force, so that the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating body in the aerosol generating device.
Drawings
FIG. 1 shows a graph of temperature sampling of a thermocouple in the prior art;
FIG. 2 is a flow chart showing a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device in an embodiment of the present invention;
FIG. 3 shows a cross-sectional view of an electromagnetic heating aerosol-generating device in an embodiment of the invention;
fig. 4 shows a cross-sectional view of an electromagnetic heating mist generating device in another embodiment of the present invention;
FIG. 5 shows a block diagram of the hardware connections in the circuit in one embodiment of the invention;
FIG. 6 shows a schematic diagram of a low pass filter-topology in an embodiment of the invention;
FIG. 7 shows a schematic diagram of a first order active low pass filter in an embodiment of the invention;
FIG. 8 shows a second flowchart of a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device in an embodiment of the present invention;
FIG. 9 shows a time-domain plot first of the electrical potential of a thermocouple of an electromagnetic heating aerosol-generating device in an embodiment of the present invention;
FIG. 10 shows a frequency domain plot first of the electrical potential of a thermocouple of an electromagnetic heating aerosol-generating device in an embodiment of the present invention;
FIG. 11 shows a third flowchart of a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device in an embodiment of the present invention;
FIG. 12 shows a time-domain diagram II of the electric potential of a thermocouple of an electromagnetic heating aerosol-generating device in an embodiment of the present invention;
FIG. 13 shows a fourth flowchart of a thermocouple temperature measurement method of an electromagnetic heating aerosol generating device in an embodiment of the present invention;
FIG. 14 shows a time-domain diagram III of the electric potential of a thermocouple of an electromagnetic heating aerosol-generating device in another embodiment of the present invention;
FIG. 15 is a flowchart fifth method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device in accordance with an embodiment of the present invention;
FIG. 16 shows a time-domain diagram of the electric potential of a thermocouple of an electromagnetic heating aerosol-generating device in a further embodiment of the present invention;
fig. 17 is a block diagram showing hardware connections of an electromagnetic heating mist generating device in another embodiment of the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description will include numerous specific details in order to provide a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In industrial processes, temperature is one of the important parameters that needs to be measured and controlled. In temperature measurement, the thermocouple has the advantages of simple structure, convenient manufacture, wide measurement range, high precision, small inertia, convenient remote transmission of output signals and the like. In addition, the thermocouple is a passive sensor, and an external power supply is not needed during measurement, so that the thermocouple is very convenient to use, and is often used for measuring temperature.
When two different conductors or semiconductors A and B form a loop, the two ends are connected with each other, as long as the temperature at the two nodes is different, one end is T, called working end or hot end, and the other end is T o Referred to as the free (also referred to as the reference) or cold end, an electromotive force is generated in the circuit, the direction and magnitude of which is dependent on the material of the conductor and the temperature of the two junctions. This phenomenon is known as the "thermoelectric effect" and the loop formed by the two conductors is known as the "thermocouple".
Thermocouples are in fact an energy converter that converts thermal energy into electrical energy and measures temperature using the generated thermoelectric potential. According to the thermoelectric effect principle of the thermocouple, when a temperature difference exists at two ends of the thermocouple, thermoelectromotive force e (t) is generated, and t represents temperature. The thermoelectromotive force e (t) can accurately reflect the temperature of the heating body.
Since thermocouples are generally made of magnetizable metal alloys, induced electromotive forces e (f, B) are generated when the thermocouple is placed in a varying magnetic field according to the law of electromagnetic induction 0 ) Wherein f represents the coil operating frequency, B 0 Representing the maximum magnetic induction that can be established inside the coil and susceptor. Induced electromotive force e (f, B) 0 ) Is affected by the frequency and intensity of the magnetic field, is an alternating current signal, and has the same frequency as the frequency of the magnetic field change. Thus, the total electromotive force fed back by the thermocouple in the magnetic field is:
e＝e(t)+e(f，B 0 )
that is, the total electromotive force actually fed back by the thermocouple in the magnetic field is equal to the thermoelectromotive force e (t) and the induced electromotive force e (f, B) 0 ) And (3) summing. Wherein, only the temperature difference electromotive force e (t) can accurately reflect the temperature of the heating body, and the induced electromotive force e (f, B) 0 ) Is an important factor causing temperature measurement errors. Namely, induced electromotive force e (f, B 0 ) Is the reason why the temperature measurement of the thermocouple in the magnetic field is affected.
In the electromagnetic heating aerosol generating device at present, the working frequency of the electromagnetic coil is from tens of kHz to several MHz, and the sampling frequency is only from hundreds of Hz to thousands of Hz when temperature feedback is generally applied. As shown in fig. 1, when temperature sampling is performed by using a thermocouple, there is a possibility that a certain high point (e.g., point a shown in fig. 1) or a certain low point (e.g., point B shown in fig. 1) is just taken as a sampling point, resulting in measurement errors. And because the temperature sampling frequency of the thermocouple is far lower than the magnetic field frequency, the acquired waveform sampled by the thermocouple is rough and cannot reflect details, so that the induced electromotive force formed in the magnetic field cannot be distinguished, two sampling points are influenced by the induced electromotive force to generate errors, and therefore, the accurate temperature difference electromotive force cannot be obtained to accurately reflect the temperature of the heating body.
Fig. 2 shows a flowchart of a thermocouple temperature measurement method of the electromagnetic heating aerosol generating device in an embodiment of the present invention. Fig. 3 shows a cross-sectional view of an electromagnetic heating mist generating device 1 in an embodiment of the present invention, comprising a heating body 11, an electromagnetic coil 12 and a temperature sensor 13. Fig. 4 shows a cross-sectional view of an electromagnetic heating mist generating device 2 in another embodiment of the present invention, comprising a heating body 21, an electromagnetic coil 22 and a temperature sensor 23. Among them, the temperature sensor 13 and the temperature sensor 23 may be thermocouple sensors.
Referring to fig. 2 in combination with fig. 3 and 4, the present invention provides a method for measuring temperature of a thermocouple, comprising:
s1: the total electromotive force fed back by the thermocouples 13,23 in the magnetic field is determined.
Illustratively, as shown in FIGS. 9, 16, at 0 th microsecond (us), the total electromotive force across the thermocouple is 1.104V; at 6 microseconds (us), the total electromotive force across the thermocouple is 1.3V. At 8 microseconds (us), the total electromotive force across the thermocouple is 1V.
Wherein the total electromotive force includes a thermoelectromotive force and an induced electromotive force.
S2: based on the total electromotive force, a calibration electromotive force is determined. As shown in fig. 9, 10, 12, 14 and 16.
Fig. 9, 16 show the total electromotive force across the thermocouple, by way of example; fig. 10, 12, 14 show the calibration electromotive forces across the thermocouple.
Fig. 10 shows the calibration electromotive force of the thermocouple, for example, 1.104V at a frequency of 0 hertz (Hz). FIG. 12 shows the calibrated electromotive force across the thermocouple at any time, such as at 0 microsecond (us), 5 microsecond (us), 15 microsecond (us), 1.104V; fig. 14 shows that the calibration electromotive force across the thermocouple is about 1.1V at 0 microsecond (us), at 14 microsecond (us), and at 25 microsecond (us).
The calibration electromotive force comprises a thermoelectromotive force and does not comprise an induced electromotive force.
S3: the temperature of the heating body is determined according to the calibration electromotive force.
By adopting the technical scheme, the thermocouple temperature measuring method of the electromagnetic heating aerosol generating device provided by the invention avoids the influence of a magnetic field, removes the induced electromotive force fed back by the thermocouples 13 and 23 in the magnetic field, and only retains the thermoelectric electromotive force, so that the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating bodies 11 and 21 in the aerosol generating device 1 and 2.
As described above, since the temperature sampling frequency of the thermocouple is far lower than the magnetic field frequency, the induced electromotive force formed in the magnetic field cannot be distinguished. Therefore, the temperature sampling frequency is at least larger than the current change frequency of the electromagnetic coil, so that the induction electromotive force generated by the influence of the magnetic field can be distinguished. And then removing the value of the induced electromotive force to obtain an accurate thermoelectric couple thermoelectric potential value.
In some possible embodiments provided by the invention, referring to fig. 5, a hardware method is adopted to raise the temperature sampling frequency of the thermocouple, that is, a low-pass filter is added in a circuit of the aerosol generating device to form a filter circuit, the filter circuit is a frequency selecting circuit, which can enable signals in a specific frequency range to pass, enable signals in other frequencies to be greatly attenuated and even not pass, that is, the low-pass filter is added to enable low-frequency signals to pass, and the influence of high-frequency signals to be removed.
In this embodiment, the electromagnetic heating aerosol generating device includes a low-pass filter, and the thermocouple is connected to an input end of the low-pass filter, where a preset frequency of the low-pass filter is smaller than an operating frequency of the coil of the magnetic field. In the present embodiment, S2: determining a calibration electromotive force based on the total electromotive force, comprising:
s21: the low-pass filter removes the induced electromotive force from the total electromotive force and outputs a calibration electromotive force as a thermoelectromotive force.
By adopting the technical scheme, the temperature sampling frequency is set to be at least greater than the current change frequency of the electromagnetic coil, and the induction electromotive force generated by the influence of the magnetic field can be distinguished by adding the hardware of the low-pass filter, so that the induction electromotive force is removed, and the more accurate thermoelectric potential of the thermocouple is obtained.
In this embodiment, it is preferable to adjust the temperature sampling frequency to be at least 2 times the current change frequency of the electromagnetic coil.
Exemplary, FIG. 6 shows a schematic diagram of a low pass filter-topology, including a power supply input U i Resistor R, capacitor C and power supply output terminal U o . Wherein, the resistor R and the capacitor C are connected in series. Referring to FIG. 6 in combination with FIG. 5, the voltage input terminal U i Connected to the signal output terminals of the thermocouple sensors 13,23, the voltage output terminal U o Is connected with a signal input end of the controller 4. Its passband cut-off frequency: f (f) 0 The passband cut-off frequency of the low-pass filter is related to the parameters of the resistor R and the capacitor C.
Fig. 7 shows a first order active low pass filter. The first-order active low-pass filter comprises a power input end U i A first resistor R, a capacitor C and a second resistor R 1 Third resistor R F Operational amplifier A and power supply output terminal U o . Wherein the first resistor R, the capacitor C and the operational amplifier A are connected in series, and the second resistor R 1 A third resistor R connected in series with the operational amplifier A F In parallel with the op-amp a. Voltage input terminal U i Connected to the signal output terminals of the thermocouple sensors 13,23, the voltage output terminal U o Is connected with a signal input end of the controller 4. I.e. an op-amp is added after the low-pass filter for signal amplification, in order to amplify the signal and enhance the signal (U 0 ) Is provided.
Referring to fig. 8, in some possible embodiments provided by the present invention, a software method is used to increase the temperature sampling frequency of the thermocouple, in this embodiment, S2: determining a calibration electromotive force based on the total electromotive force, comprising:
s22: the total electromotive force of the thermocouple in the time domain fed back in the magnetic field is obtained.
As an example, referring to fig. 9 in combination with fig. 3 and 4, the frequency of the current change in the electromagnetic coils 12, 22 is 86kHz, the thermocouples 13,23 are located in the heating bodies 11,21 in the electromagnetic coils 12, 22, the temperature sampling frequency of the thermocouples 13,23 is increased to 500MHz, and the potential data of both ends of the thermocouples 13,23 are measured as shown in fig. 9.
S23: the obtained total electromotive force of the time domain is converted into the total electromotive force of the frequency domain.
As can be seen from fig. 9, the temperature change frequency of the thermocouples 13,23 is also 86kHz, for example. The signal shown in fig. 9 is subjected to a fast fourier transform to obtain a frequency domain plot thereof, i.e. fig. 10, also referred to as an amplitude-frequency plot.
S24: the amplitude at the frequency of 0Hz in the total electromotive force of the frequency domain is obtained as the calibration electromotive force.
Illustratively, as shown in FIG. 10, at a frequency of 0Hz, i.e., in a DC environment, the thermocouple does not generate an induced electromotive force, and the potential peak of the thermocouple is 1.104V, i.e., the amplitude contribution of 0 due to the temperature difference is 1.104V. This value was taken as the thermoelectric potential value of the thermocouple at this time, i.e., the calibration electromotive force.
By adopting the technical scheme, the temperature sampling frequency is set to be at least greater than the current change frequency of the electromagnetic coil, the time domain and the frequency domain of the total electromotive force are converted, the amplitude of the frequency of 0Hz in the total electromotive force of the frequency domain is obtained as the calibration electromotive force, namely, the peak value of the thermoelectric electromotive force of the thermocouple in DC is obtained as the calibration electromotive force, and the induced electromotive force is removed, so that the obtained thermoelectric electromotive force (calibration electromotive force) is more accurate.
In some possible embodiments provided by the present invention, S23: converting the obtained total electromotive force of the time domain into the total electromotive force of the frequency domain, comprising:
s231: the obtained total electromotive force of the time domain is converted into the total electromotive force of the frequency domain by fourier transform. The total electromotive force diagram of the frequency domain is also called an amplitude-frequency diagram, and the relation between the frequency and the amplitude can be clearly and accurately displayed.
Referring to fig. 11, in some possible embodiments provided by the present invention, S24: acquiring the amplitude of the frequency at 0Hz in the total electromotive force of the frequency domain as the calibration electromotive force comprises:
s241: the amplitude at the frequency of 0Hz in the total electromotive force of the frequency domain is obtained as the calibration electromotive force.
Illustratively, as shown in FIG. 10, when the frequency is 0Hz, the potential peak of the thermocouple is 1.104V as the calibration electromotive force.
S242: the calibration electromotive force is taken as the temperature difference electromotive force in the frequency domain.
For example, as shown in fig. 10, when the frequency is 0Hz, the calibration electromotive force of the thermocouple is 1.104V as the thermoelectromotive force, which is the thermoelectromotive force in the frequency domain.
S243: the thermoelectromotive force of the frequency domain is converted into the thermoelectromotive force of the time domain.
Illustratively, the frequency domain plot of the thermoelectromotive force thereof is converted into the time domain plot of the thermoelectromotive force as shown in fig. 12, that is, the calibration electromotive force after the induced electromotive force is removed is constant at 1.104V.
By adopting the technical scheme, the thermoelectric potential of the converted time domain can be clearly shown. The calibration electromotive force according to 1.104V can be converted into a temperature difference by a thermocouple scale. Further, based on the temperature difference and the initial temperature of the heating body, the real-time temperature of the heating body can be calculated.
Referring to fig. 13, in some possible embodiments provided by the present invention, S2: determining a calibration electromotive force based on the total electromotive force, comprising:
s25: the total electromotive force of the thermocouple in the time domain fed back in the magnetic field is obtained. As shown in fig. 9.
S26: the obtained total electromotive force of the time domain is converted into the total electromotive force of the frequency domain. As shown in fig. 10.
S27: and acquiring the amplitude value of the frequency domain, which is the frequency multiplication of the coil working frequency, in the total potential of the frequency domain as the induced electromotive force.
Illustratively, with continued reference to FIG. 10, in addition to the amplitude contribution of frequency 0 caused by the temperature difference, there is a contribution at 86kHz and its frequency multiplication, which are all the electromotive force contributions affected by the magnetic field, the amplitude at 86kHz and its frequency multiplication being the induced electromotive force.
S28: the total electromotive force in the frequency domain is removed from the induced electromotive force to obtain a calibration electromotive force in the frequency domain.
Illustratively, the total electromotive force in the frequency domain is used to remove 86kHz and the amplitude at its frequency multiplication is the induced electromotive force, and the calibrated electromotive force in the frequency domain is obtained.
S29: the calibration electromotive force is taken as the temperature difference electromotive force in the frequency domain.
And taking the obtained calibration electromotive force of the frequency domain with the amplitude of 86kHz and frequency multiplication thereof removed as the induced electromotive force as the temperature difference electromotive force of the frequency domain.
S30: and converting the thermoelectromotive force into the thermoelectromotive force of the time domain according to the thermoelectromotive force of the frequency domain.
Illustratively, the aforementioned thermoelectromotive force in the frequency domain is converted into the thermoelectromotive force in the time domain as shown in fig. 14. Referring to fig. 14, the filtered electromotive force is substantially around 1.1V, which is substantially identical to the direct current contribution result 1.104V in the previous embodiment, so that the electromotive force of 1.104V can be regarded as the obtained calibration electromotive force (thermoelectromotive force) from which the influence of the electromagnetic field is eliminated, thereby converting the thermoelectromotive force into a temperature difference through the thermocouple graduation meter, and optimizing the accuracy of thermocouple temperature measurement.
By adopting the technical scheme, the induced electromotive force of the thermocouple in the electromagnetic environment is determined according to the working frequency of the electromagnetic coil, and the calibration electromotive force is obtained according to the induced electromotive force and the total electromotive force to serve as the thermoelectric electromotive force. Compared with the method for acquiring the induced electromotive force under all frequencies in the electromagnetic environment, the method not only ensures the accuracy of the acquired thermoelectric electromotive force, but also reduces the calculated data volume and improves the calculation efficiency.
In some possible embodiments provided by the present invention, S30: converting the thermoelectromotive force according to the frequency domain into the thermoelectromotive force of the time domain, comprising:
s301: the acquired thermoelectromotive force of the frequency domain is converted into thermoelectromotive force of the time domain by inverse Fourier transform.
By adopting the technical scheme, the temperature difference electromotive force in the time domain, namely the temperature difference electromotive force after filtering, is obtained through inverse Fourier transform, so that the temperature difference obtained by the method is more accurate.
Illustratively, the inverse fourier transform of the processed data results in a filtered electromotive force as shown in fig. 14.
In some possible embodiments provided by the present invention, the current variation period of the electromagnetic coils 12, 22 of the electromagnetic heating aerosol-generating device 1,2 is settable, and thus, the integer multiple time of its variation period may be obtained by counting or the like. Since the magnitude of the induced electromotive force is related to the frequency and intensity of the magnetic field, the induced electromotive force e (f, B 0 ) Is substantially unchanged. Thus, calibration of the temperature detection of the thermocouple can also be achieved by taking integer multiples of the electromagnetic field variation period through the temperature sampling time interval.
Referring to fig. 15, in some possible embodiments provided by the present invention, the electromagnetic heating aerosol-generating device 1,2 comprises a temperature measuring element other than a thermocouple.
Illustratively, referring to FIG. 16, point C in the figure is one sample point at random time. The setting circuit takes a sampling point D again after 3 cycles. The two obtained sampling points C, D are positioned at the same position of the electromotive force fluctuation period. Thus, the effect of the electromagnetic field on the thermocouple electromotive force is a constant, namely:
e＝e(t)+k
where e is the electromotive force after bias, e (t) is the thermoelectromotive force, and k is a constant.
Since k is a constant, the electromotive force value sampled at this time coincides with the variation of the thermoelectromotive force. The offset electromotive force e can be directly used for directly replacing the temperature difference electromotive force e (t) to be converted into a temperature difference value, and the electromotive force e and the temperature difference electromotive force e (t) are constantly offset, so that the temperature feedback and the temperature control are not influenced, and the fluctuation influence of an electromagnetic field is eliminated.
S2: determining a calibration electromotive force based on the total electromotive force, comprising:
s201: the method comprises the steps of obtaining the total electromotive force of a thermocouple in an electromagnetic heating working environment at first time.
The first time is the total electromotive force of the thermocouple at any point in time in the electromagnetic heating operating environment.
Illustratively, as shown in FIG. 16, the first time is 7 microseconds (us), i.e., at point C. As another example, the first time is 2 microseconds (us). Exemplary acquisition of the total electromotive force of the thermocouple in the electromagnetic heating operating environment at the first time is (e1=e o +k)。
S202: the temperature measuring element is used for obtaining the accurate temperature of the heating body in the electromagnetic heating working environment at the first time, and the thermoelectric potential of the thermocouple is obtained according to the accurate temperature.
The temperature measuring element is used for acquiring the accurate temperature of the heating body at the first time, namely the time of the accurate temperature measured by the temperature measuring element is the same as the time of the total electromotive force acquired by the thermocouple, so that the follow-up constant value of the offset induced electromotive force in the same time is ensured.
By way of example, the actual and exact temperature of the heating element in the electromagnetic heating operating environment at the first time is obtained by means of a temperature measuring element (outside the thermocouple) and corresponds to a thermoelectromotive force of e 0 。
S203: the induced electromotive force is obtained according to the total electromotive force at the first time and the thermoelectromotive force at the first time.
Illustratively, the total electromotive force (e 1 ＝e 0 +k) and a first time of thermoelectromotive force e 0 An induced electromotive force of k is obtained, and (k=e 1 -e 0 )。
As described above, since the magnitude of the induced electromotive force is related to the frequency and intensity of the magnetic field, when the heating power is adjusted by the duty ratio or the like, the induced electromotive force e (f, B 0 ) Is basically unchanged. Thus, the total electromotive force e of the thermocouple at the first time can be calculated 1 Calibration of the thermoelectric potential e obtained for temperature measuring elements other than thermocouples 0 。
S204: and acquiring the total electromotive force of the thermocouple in the electromagnetic heating working environment in the calibration time.
The calibration time, i.e. the specific point in time when actually measuring, of the thermocouple to measure the temperature of the heating body should also be kept the same as the calibration time of other temperature measuring elements except the thermocouple to measure the temperature of the heating body.
Illustratively, the total electromotive force of the thermocouple in the electromagnetic heating working environment at the time of calibration is obtained when actual measurement is carried out, for example, the thermocouple is read as e 2 。
S205: and obtaining the calibration electromotive force of the calibration time as the thermoelectric electromotive force according to the total electromotive force and the induced electromotive force of the calibration time.
Illustratively, the total electromotive force e according to the calibration time 2 And an induced electromotive force k to obtain a calibration electromotive force (e 2 -k) as thermoelectromotive force. Calibrating electromotive force (e) 2 -k) that is (e 2 +e 0 -e 1 ) Is a true thermoelectromotive force.
By adopting the technical scheme, the influence of the electromagnetic field on the electromotive force of the thermocouple, namely the induced electromotive force is taken as a constant, and the total potential of the thermocouple is constantly biased into the thermoelectromotive force of the thermocouple, so that the fluctuation influence of the electromagnetic field is eliminated, the temperature sampling frequency is reduced, and compared with the prior art, the influence of the electromagnetic field is eliminated, and the thermocouple can more accurately measure the temperature of the heating body.
In some possible embodiments provided by the present invention, S202: the method for obtaining the accurate temperature of the heating body in the electromagnetic heating working environment at the first time through the temperature measuring element comprises the following steps:
s2021: the temperature measuring element is used for obtaining the accurate temperature of the heating body in the electromagnetic heating working environment at the first time, and the thermoelectric potential of the thermocouple is obtained through the thermocouple graduation meter according to the accurate temperature.
Illustratively, in the present embodiment, the calibration electromotive force (e 2 -k) that is (e 2 +e 0 -e 1 ) Is a true thermoelectromotive force. And inquiring a thermocouple graduation table to convert the real thermoelectromotive force into a temperature difference. Feeding inIn one step, the real-time temperature of the heating body can be calculated according to the temperature difference and the initial temperature of the heating body.
In the present embodiment, the period of the interval between the points C and D shown in fig. 16 is not limited as long as it is an integer multiple of the current period. Illustratively, the electromagnetic field has a frequency of 1MHz and a period s, so the sampling period may be an integer multiple of 1ms,2ms,200ms, etc. Thus, the temperature sampling frequency can be greatly reduced, and compared with the prior art, the influence of the electromagnetic field is eliminated.
In any one of the foregoing embodiments provided by the present invention, S2: determining a calibration electromotive force based on the total electromotive force, comprising: the temperature sampling frequency is adjusted to be larger than the current change frequency of the electromagnetic coil, so that the induced electromotive force generated by the influence of the magnetic field can be distinguished, the induced electromotive force can be conveniently removed, and more accurate thermocouple thermoelectric electromotive force can be obtained.
Preferably, the temperature sampling frequency is adjusted to be at least 2 times the current change frequency of the electromagnetic coil.
In embodiments provided herein, the aerosol-generating article may be a solid. The aerosol-generating device 1,2 is a heated non-combustible smoking article that is heated by a heating circuit to meet the smoking experience of the user.
Referring to fig. 5, the present invention provides an electromagnetic heating aerosol generating device comprising: heating bodies 11,21, thermocouple sensors 13,23, a low pass filter 3, a controller 4, a processor and a memory.
Wherein the heating body 11,21 is used for heating the aerosol-generating substrate.
The signal input ends of the thermocouple sensors 13,23 are connected with the heating bodies 11, 21; for measuring the temperature of the heating bodies 11, 21.
The signal input of the low-pass filter 3 is connected to the signal output of the thermocouple sensors 13, 23.
The signal input of the controller 4 is connected to the signal output of the low-pass filter 3.
And the processor 5 is connected with the signal output end of the controller.
A memory 6, the memory 6 being connected to the processor 5, the memory 6 comprising instructions which, when executed by the processor, cause the electromagnetic heating aerosol generating device to perform the method of measuring temperature:
s1: the total electromotive force fed back by the thermocouple in the magnetic field is determined, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force.
S2: based on the total electromotive force, a calibration electromotive force is determined, the calibration electromotive force including a thermoelectromotive force and not including an induced electromotive force. Comprising the following steps: s21: the low-pass filter removes the induced electromotive force from the total electromotive force, and outputs a calibration electromotive force as a thermoelectromotive force,
s3: the temperature of the heating body is determined according to the calibration electromotive force.
The electromagnetic heating circuit is provided with a low-pass filter 3, the signal input end of the low-pass filter 3 is connected with the signal output ends of thermocouples 13,23 (shown in connection with fig. 3 and 4), and the signal output end of the low-pass filter 3 is connected with the signal input end of the controller 4. The low-pass filter 3 is used for cutting off signals with a frequency higher than a preset frequency, and the preset frequency is smaller than the working frequency of the coil.
By adopting the technical scheme, the low-pass filter is arranged in the electromagnetic heating aerosol generating device, so that the low-frequency signal is allowed to pass, the influence of the high-frequency signal is deleted, namely the induced electromotive force of the thermocouple in electromagnetic heating is removed, the temperature difference electromotive force of the thermocouple is only reserved, and the temperature difference of the heating body is obtained according to the temperature difference electromotive force, and the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating body in the aerosol generating device.
Referring to fig. 17, the present invention provides an electromagnetic heating aerosol generating device comprising: heating bodies 11,21, thermocouple sensors 13,23, a controller 4, a processor 5 and a memory 6.
Wherein the heating body 11,21 is used for heating the aerosol-generating substrate. Thermocouple sensors 13,23, the signal input is connected with heating body 11,21, is used for measuring the temperature of the heating body. The signal input end of the controller 4 is connected with the signal output end of the thermocouple sensor. The processor 5 is connected with the signal output end of the controller 4. The memory 6 includes instructions that, when executed by the processor 5, cause the electromagnetic heating aerosol generating device to perform the thermocouple temperature measurement method of any of the previous embodiments.
By adopting the technical scheme, when the thermocouple in the electromagnetic heating aerosol generating device measures temperature, the induced electromotive force fed back by the thermocouple in the magnetic field is removed, the thermoelectric electromotive force of the thermocouple is only reserved, and the temperature difference of the heating body is obtained according to the thermoelectric electromotive force, so that the thermocouple sensor is used for conveniently and accurately measuring the temperature of the heating body in the aerosol generating device.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the invention with reference to specific embodiments, and it is not intended to limit the practice of the invention to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present invention.
Claims (13)
1. A thermocouple temperature measurement method of an electromagnetic heating aerosol generating device, comprising:
determining the total electromotive force fed back by the thermocouple in the magnetic field, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force;
determining a calibration electromotive force based on the total electromotive force, the calibration electromotive force including a thermoelectromotive force and not including an induced electromotive force;
and determining the temperature of the heating body according to the calibration electromotive force.
2. The thermocouple temperature measurement method of an electromagnetic heating aerosol generating device according to claim 1, wherein the electromagnetic heating aerosol generating device comprises a low-pass filter, the thermocouple is connected with an input end of the low-pass filter, and a preset frequency of the low-pass filter is smaller than an operating frequency of a coil of a magnetic field;
the determining a calibration electromotive force based on the total electromotive force includes:
the low-pass filter removes the induced electromotive force from the total electromotive force and outputs the calibration electromotive force as the thermoelectromotive force.
3. The method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device as set forth in claim 1, wherein said determining a calibration electromotive force based on said total electromotive force includes:
acquiring the total electromotive force of the time domain fed back by the thermocouple in the magnetic field;
converting the obtained total electromotive force of the time domain into the total electromotive force of the frequency domain;
and acquiring the amplitude value of the total electromotive force of the frequency domain, which is at the frequency of 0Hz, as a calibration electromotive force.
4. The method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device as set forth in claim 3, wherein said converting the acquired total electromotive force in the time domain into the total electromotive force in the frequency domain includes:
the obtained total electromotive force of the time domain is converted into a total electromotive force of a frequency domain by fourier transformation.
5. The method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device as set forth in claim 4, wherein said obtaining a magnitude at a frequency of 0Hz of a total electromotive force in said frequency domain as a calibration electromotive force includes:
acquiring the amplitude value of the frequency of 0Hz in the total electromotive force of the frequency domain as a calibration electromotive force;
taking the calibration electromotive force as the thermoelectromotive force of a frequency domain;
and converting the thermoelectromotive force of the frequency domain into the thermoelectromotive force of the time domain.
6. The method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device as set forth in claim 1, wherein said determining a calibration electromotive force based on said total electromotive force includes:
acquiring the total electromotive force of the time domain fed back by the thermocouple in the magnetic field;
converting the obtained total electromotive force of the time domain into the total electromotive force of the frequency domain;
acquiring the amplitude of the frequency doubling part with the frequency being the coil working frequency in the total potential of the frequency domain as the induced electromotive force;
removing the induced electromotive force from the total electromotive force of the frequency domain to obtain a calibration electromotive force of the frequency domain;
taking the calibration electromotive force as the thermoelectromotive force of a frequency domain;
and converting the thermoelectromotive force according to the temperature difference of the frequency domain into the thermoelectromotive force of the time domain.
7. The thermocouple temperature measurement method of an electromagnetic heating aerosol generating device as set forth in claim 5 or 6, wherein the converting of the thermoelectromotive force according to the frequency domain into the thermoelectromotive force of the time domain includes:
and converting the acquired thermoelectric potential of the frequency domain into the thermoelectric potential of the time domain through Fourier inversion.
8. The thermocouple temperature measurement method of an electromagnetic heating aerosol generating device according to claim 1, wherein the electromagnetic heating aerosol generating device comprises a temperature measurement element other than a thermocouple;
the determining a calibration electromotive force based on the total electromotive force includes:
acquiring the total electromotive force of the thermocouple in the electromagnetic heating working environment at the first time;
the temperature measuring element is used for acquiring the accurate temperature of a heating body in the electromagnetic heating working environment at the first time, and the thermoelectric potential of the thermocouple is acquired according to the accurate temperature;
obtaining an induced electromotive force according to the total electromotive force at the first time and the thermoelectric electromotive force at the first time;
acquiring the total electromotive force of the thermocouple in the electromagnetic heating working environment in the calibration time;
and obtaining the calibration electromotive force of the calibration time as the thermoelectric electromotive force according to the total electromotive force of the calibration time and the induced electromotive force.
9. The method for measuring temperature by a thermocouple of an electromagnetic heating aerosol generating device as set forth in claim 8, wherein said obtaining, by said temperature measuring element, an accurate temperature of a heating body in said electromagnetic heating working environment at a first time, and obtaining a thermoelectromotive force of said thermocouple based on said accurate temperature, comprises:
and obtaining the thermoelectromotive force of the thermocouple through a thermocouple graduation table according to the accurate temperature.
10. The thermocouple temperature measurement method of an electromagnetic heating aerosol generating device according to any one of claims 1 to 6, 8 to 9, wherein the determining a calibration electromotive force based on the total electromotive force includes: the temperature sampling frequency is adjusted to be larger than the current change frequency of the electromagnetic coil.
11. The method of thermocouple temperature measurement of an electromagnetic heating aerosol generating device as set forth in claim 10, wherein the temperature sampling frequency is adjusted to be at least 2 times the frequency of current variation of the electromagnetic coil.
12. An electromagnetic heating mist generating device, characterized by comprising:
a heating body for heating the aerosol-generating substrate;
the signal input end of the thermocouple is connected with the heating body and is used for measuring the temperature of the heating body;
the signal input end of the low-pass filter is connected with the signal output end of the thermocouple;
the signal input end of the controller is connected with the signal output end of the low-pass filter;
the processor is connected with the signal output end of the controller;
a memory comprising instructions that, when executed by the processor, cause the electromagnetic heating aerosol-generating device to perform a thermocouple temperature measurement method comprising:
determining the total electromotive force fed back by the thermocouple in the magnetic field, wherein the total electromotive force comprises temperature difference electromotive force and induced electromotive force;
determining a calibration electromotive force based on the total electromotive force, comprising: the low-pass filter removes the induced electromotive force in the total electromotive force and outputs the calibration electromotive force as the thermoelectromotive force, wherein the calibration electromotive force comprises the thermoelectromotive force and does not comprise the induced electromotive force;
and determining the temperature of the heating body according to the calibration electromotive force.
13. An electromagnetic heating mist generating device, characterized by comprising:
a heating body for heating the aerosol-generating substrate;
the signal input end of the thermocouple is connected with the heating body and is used for measuring the temperature of the heating body;
the signal input end of the controller is connected with the signal output end of the thermocouple;
the processor is connected with the signal output end of the controller;
a memory comprising instructions that, when executed by the processor, cause the electromagnetic heating aerosol-generating device to perform the thermocouple temperature measurement method of any one of claims 1 or 3 to 11.
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