Aerosol-generating device

Abstract

The utility model discloses an aerosol generating device, which comprises a power amplifier tube for performing power amplification on a generated microwave signal, an antenna for radiating the amplified microwave signal to an aerosol generating substrate, a circulator and an absorption resistor, the input end of the circulator is connected with the output end of the power amplifier tube, the output end of the circulator is connected with the antenna, the isolation end of the circulator is connected with the first end of the absorption resistor, and the second end of the absorption resistor is grounded. According to the technical scheme, even if the aerosol generating substrate is subjected to phase change in the atomization heating process, and the dielectric property of a heated object is changed, it can be guaranteed that the reflected microwave signals cannot greatly affect a pre-stage circuit, and therefore the electrical performance of the power amplifier tube is improved, and the power amplifier tube is suitable for being used in the field of electronic devices. And the overall performance of the aerosol generating device is further improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic atomization, and in particular to an aerosol generating device. Background Technology

[0002] With the continuous development of science and technology, although atomization heating has made great progress, electronic atomization devices still have the disadvantage of slow heating speed, which cannot meet users' needs for zero waiting time, thus leading to the emergence of microwave atomization technology.

[0003] Microwave atomization involves amplifying the generated microwave signal before radiating it into a heating cavity to heat and atomize the atomizing medium within the cavity. Currently, the typical design of microwave atomization technology involves a power amplifier tube connected to an antenna unit. In this design, due to the high frequency of the microwave signal, the atomizing medium is easily affected by external factors such as environment, temperature, and humidity, causing a phase transition. During heating, this phase transition changes the dielectric constant of the atomizing medium, which in turn affects the preceding circuitry, leading to a deterioration in the electrical performance of the power amplifier tube and ultimately impacting the overall performance of the microwave atomization product. Utility Model Content

[0004] The technical problem to be solved by this application is to provide an aerosol generating device, which addresses the technical defect of the power amplifier tube deteriorating during the heating process in the prior art.

[0005] The technical solution adopted by this application to solve its technical problem is: to construct an aerosol generating device, including a power amplifier tube for amplifying the generated microwave signal, and an antenna for radiating the amplified microwave signal to the aerosol generating matrix, and also including a circulator and an absorption resistor, wherein the input terminal of the circulator is connected to the output terminal of the power amplifier tube, the output terminal of the circulator is connected to the antenna, the isolation terminal of the circulator is connected to the first terminal of the absorption resistor, and the second terminal of the absorption resistor is grounded.

[0006] Preferably, it further includes:

[0007] A forward coupler connected between the output terminal of the power amplifier tube and the input terminal of the circulator, and used to couple the amplified microwave signal;

[0008] An anti-coupler connected between the isolation terminal of the circulator and the first terminal of the absorption resistor, for coupling the reflected microwave signal.

[0009] Preferably, it further includes:

[0010] A first sampling unit for sampling the microwave signal coupled by the forward coupler;

[0011] A second sampling unit for sampling the microwave signal coupled by the reverse coupler.

[0012] Preferably, the forward coupler includes: a first resistor, and a first transmission microstrip line and a first coupling microstrip line coupled together, wherein a first end of the first transmission microstrip line is connected to the output terminal of the power amplifier tube, and a second end of the first transmission microstrip line is connected to the input terminal of the circulator; the coupling end of the first coupling microstrip line is connected to the input terminal of the first sampling unit, and the isolation end of the first coupling microstrip line is grounded through the first resistor; and / or,

[0013] The reverse coupler includes a second resistor, and a coupled second transmission microstrip line and a coupled second coupling microstrip line, wherein a first end of the second transmission microstrip line is connected to the isolation terminal of the circulator, and a second end of the second transmission microstrip line is connected to the first end of the absorption resistor; the coupling terminal of the second coupling microstrip line is connected to the input terminal of the second sampling unit, and the isolation terminal of the second coupling microstrip line is grounded through the second resistor.

[0014] Preferably, the first sampling unit includes a first inductor and a first detector, the first end of the first inductor and the input end of the first detector are respectively connected to the coupling end of the forward coupler, the second end of the first inductor is grounded, and the output end of the first detector is the output end of the first sampling unit; and / or,

[0015] The second sampling unit includes a second inductor and a second detector. The first end of the second inductor and the input end of the second detector are respectively connected to the coupling end of the reverse coupler. The second end of the second inductor is grounded. The output end of the second detector is the output end of the second sampling unit.

[0016] Preferably, the first detector and / or the second detector are zero-bias Schottky detectors.

[0017] Preferably, it further includes:

[0018] A first low-pass filter is connected between the coupling terminal of the forward coupler and the input terminal of the first sampling unit, and the variation trend of the amplitude-frequency characteristic of the first low-pass filter within a preset frequency band is opposite to the variation trend of the coupling degree of the forward coupler within the preset frequency band; and / or,

[0019] A second low-pass filter is connected between the coupling terminal of the reverse coupler and the input terminal of the second sampling unit, and the variation trend of the amplitude-frequency characteristic of the second low-pass filter in the preset frequency band is opposite to the variation trend of the coupling degree of the reverse coupler in the preset frequency band.

[0020] Preferably, it further includes:

[0021] An output microstrip line connected between the output terminal of the power amplifier tube and the input terminal of the forward coupler; and / or,

[0022] The input microstrip line is connected to the input terminal of the power amplifier tube.

[0023] Preferably, the width of the output microstrip line decreases in a stepped manner along the microwave signal transmission direction;

[0024] The width of the input microstrip line increases in a stepped manner along the microwave signal transmission direction.

[0025] Preferably, the system further includes at least two filter capacitors, with one end of each of the at least two filter capacitors connected to different positions on the output microstrip line, and the other end of each of the at least two filter capacitors grounded.

[0026] By adding a circulator and an absorption resistor to the front end of the antenna of the aerosol generating device, the reflected microwave signal can be absorbed. Therefore, even if the aerosol generating matrix undergoes a phase change during the atomization heating process, resulting in a change in the dielectric properties of the heated object, the reflected microwave signal can be guaranteed not to have a significant impact on the front-end circuit. Thus, the electrical performance of the power amplifier tube is improved, thereby improving the overall performance of the aerosol generating device. Attached Figure Description

[0027] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0028] Figure 1 This is a circuit diagram of an aerosol generating device in one embodiment of this application;

[0029] Figure 2 This is a circuit diagram of the first sampling unit of the aerosol generating device in one embodiment of this application;

[0030] Figure 3 This is a test diagram of the circuit performance S-parameters of an aerosol generating device in one embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Figure 1 This is a circuit diagram of an aerosol generating device according to an embodiment of this application. The aerosol generating device of this embodiment includes a power amplifier tube 11, an antenna 12, a circulator 13, and an absorption resistor R2. The power amplifier tube 11 is used to amplify the generated microwave signal (e.g., a microwave signal with a frequency of 2.38 to 2.52 GHz). The antenna 12 is used to radiate the amplified microwave signal to the aerosol generating matrix. The input terminal of the circulator 13 is connected to the output terminal of the power amplifier tube 11, the output terminal of the circulator 13 is connected to the antenna 12, the isolation terminal of the circulator 13 is connected to the first terminal of the absorption resistor R2, and the second terminal of the absorption resistor R2 is grounded.

[0033] Regarding the circulator 13 in this embodiment, it should be noted that it is a unidirectional signal transmission radio frequency device with gyromagnetic and Faraday rotational effects, capable of transmitting amplified microwave signals and isolating reflected microwave signals. The circulator 13 includes three ports: an input port, an output port, and an isolation port. Its working principle is as follows: the amplified microwave signal is transmitted from the input port to the output port, and then the output port transmits the microwave signal to the antenna 12. The antenna 12 converts the transmitted microwave signal into electromagnetic waves that are radiated onto the aerosol generating matrix. The isolation port of the circulator 13 absorbs the microwave signal reflected from the output port through the absorption resistor R2, ensuring that the reflected signal is not transmitted to the input port. In practical applications, even if the aerosol generating matrix undergoes a phase transition during atomization and heating, the change in dielectric constant causes impedance mismatch, resulting in microwave signal reflection. The isolation port of the circulator 13 can guide the reflected microwave signal back to the absorption resistor R2.

[0034] Regarding the absorption resistor R2 in this embodiment, it should be noted that it is used to absorb the energy of the reflected microwave signal. The absorption resistor R2 can be a 50-ohm high-power radio frequency resistor. On the one hand, the resistance of the absorption resistor R2 is 50 ohms, which can be matched with the impedance of the external line; on the other hand, the absorption resistor R2 is selected as a high-power resistor. For example, before leaving the factory, the maximum power of the reflected signal under the worst conditions can be determined according to the structure and application scenario of the aerosol generating device. Then, an absorption resistor R2 with appropriate power can be selected according to the maximum power, and the absorption resistor R2 can be ensured to have good temperature characteristics.

[0035] By adding a circulator and an absorption resistor to the front end of the antenna of the aerosol generating device, the reflected microwave signal can be absorbed. Therefore, even if the aerosol generating matrix undergoes a phase change during the atomization heating process, resulting in a change in the dielectric properties of the heated object, the reflected microwave signal can be guaranteed not to have a significant impact on the front-end circuit. Thus, the electrical performance and stability of the power amplifier tube are improved, thereby improving the overall performance and stability of the aerosol generating device.

[0036] Furthermore, such as Figure 1 As shown, the aerosol generating device in this embodiment further includes a forward coupler 14 and a reverse coupler 15. The forward coupler 14 is connected between the output terminal of the power amplifier tube 11 and the input terminal of the circulator 13, and is used to couple the amplified microwave signal. The reverse coupler 15 is connected between the isolation terminal of the circulator 13 and the first terminal of the absorption resistor R2, and is used to couple the reflected microwave signal. In this embodiment, for the forward coupler 14, on the one hand, the amplified microwave signal is transmitted to the subsequent circulator 13; on the other hand, a small amount of microwave signal is picked up from the transmitted amplified microwave signal and coupled to the coupling terminal for signal sampling. Similarly, for the reverse coupler 15, on the one hand, the reflected signal received by the circulator 13 is transmitted to the absorption resistor R2 for absorption by the absorption resistor R2; on the other hand, a small amount of microwave signal is picked up from the reflected microwave signal and coupled to the coupling terminal for signal sampling.

[0037] Furthermore, such as Figure 1 As shown, the aerosol generating device in this embodiment further includes a first sampling unit 16 and a second sampling unit 17, wherein the first sampling unit 16 is used to sample the microwave signal coupled by the forward coupler 14; and the second sampling unit 17 is used to sample the microwave signal coupled by the reverse coupler 15.

[0038] Furthermore, in an optional embodiment, the output microwave signal and the reflected microwave signal are sampled, and then these two sampled signals are sent to the control unit of the aerosol generating device. The control unit then determines the frequency of the microwave signal with the lowest power from the reflected microwave signals within a preset time period, and adjusts the frequency of the output microwave signal according to the determined frequency so that the frequency of the output microwave signal is equal to the frequency of the lowest power reflected microwave signal. In this embodiment, if the reflected microwave signal has the lowest power, it means that most of the microwave energy has been absorbed by the aerosol generating matrix, resulting in minimal microwave energy waste. Therefore, by determining the frequency of the lowest power reflected microwave signal and adjusting the frequency of the output microwave signal, microwave energy can be efficiently transferred to the aerosol generating matrix, improving the heating speed of heating atomization, meeting the user's "zero-wait" requirement, and also avoiding microwave energy waste, thus improving the overall efficiency of the equipment.

[0039] Furthermore, such as Figure 1 As shown, both the forward coupler 14 and the reverse coupler 15 are microstrip couplers. Specifically, the forward coupler 14 includes a first resistor R1 and a coupled first transmission microstrip line and a first coupling microstrip line. The first end of the first transmission microstrip line is connected to the output terminal of the power amplifier tube 11, and the second end of the first transmission microstrip line is connected to the input terminal of the circulator 13. The coupling end of the first coupling microstrip line is connected to the input terminal of the first sampling unit 16, and the isolation end of the first coupling microstrip line is grounded through the first resistor R1. Similarly, the reverse coupler 15 includes a second resistor R3 and a coupled second transmission microstrip line and a second coupling microstrip line. The first end of the second transmission microstrip line is connected to the isolation terminal of the circulator 13, and the second end of the second transmission microstrip line is connected to the first end of the absorption resistor R2. The coupling end of the second coupling microstrip line is connected to the input terminal of the second sampling unit 17, and the isolation end of the second coupling microstrip line is grounded through the second resistor R3.

[0040] In one specific embodiment, the structure of the microstrip coupler is illustrated below using forward coupler 14 as an example: The first output microstrip line can be a 50-ohm impedance microstrip line for transmitting amplified microwave signals. The physical conductor length can be 1 / 4 wavelength of the signal at the operating frequency of the power amplifier tube 11, thus minimizing microwave signal loss, optimizing transmission performance, and achieving good coupling performance. The first resistor R1 can be a 50-ohm resistor as an absorption resistor for the reverse signal, ensuring the stable performance of the forward coupler 14. It should be understood that the structure of the reverse coupler 15 is similar to that of the forward coupler 14, and will not be described again here.

[0041] Furthermore, such as Figure 2As shown, the first sampling unit includes a first inductor L1 and a first detector D1. The first end of the first inductor L1 and the input end of the first detector D1 are respectively connected to the coupling end of a forward coupler. The second end of the first inductor L1 is grounded, and the output end of the first detector D1 is the output end of the first sampling unit. Similarly, the second sampling unit (not shown) includes a second inductor and a second detector. The first end of the second inductor and the input end of the second detector are respectively connected to the coupling end of a reverse coupler. The second end of the second inductor is grounded, and the output end of the second detector is the output end of the second sampling unit. In the first and second sampling units of this embodiment, the first inductor L1 and the second inductor filter the input signal, and the first detector D1 and the second detector perform power detection and conversion on the filtered signal and output a detected signal.

[0042] Furthermore, the first detector and / or the second detector is preferably a zero-bias Schottky detector. Since the zero-bias Schottky detector does not require an additional power supply, the detection speed can be increased, thereby improving the dynamic response speed and ensuring the stability of the system and product.

[0043] In such Figure 1 In the aerosol generating apparatus of the illustrated embodiment, if the operating frequency of the aerosol generating apparatus is 2.4 GHz to 2.5 GHz, and the center frequency f0 = 2.45 GHz. Furthermore, if the input terminal of the power amplifier tube 11 is used as the input port and the output terminal of the circulator 13 is used as the output port, then when testing the aerosol generating apparatus using a network analyzer E5071C, the test data are shown in Table 1 and... Figure 3 As shown, at operating frequencies of 2.4GHz, 2.45GHz, and 2.5GHz, the return loss (dB(S(1,1)) at the input port is -24.53dB, -28.82dB, and -23.58dB, respectively; the return loss (dB(S(2,2)) at the output port is -28.29dB, -33.23dB, and -29.64dB, respectively; the isolation S12 (dB(S(1,2)) is -31.07dB, -34.41dB, and -28.29dB, respectively; and the insertion loss S21 (dB(S(2,1)) is -0.18dB, -0.2dB, and -0.22dB, respectively. Calculations show that at an operating frequency of 2.45GHz, the isolation is significantly greater than 2500 times, achieving a relatively ideal and optimal effect.

[0044]

[0045] Table 1

[0046] Further, in an optional embodiment, the aerosol generating apparatus of this application further includes: a first low-pass filter and a second low-pass filter, which are preferably elliptical low-pass filters. The first low-pass filter is connected between the coupling end of the forward coupler and the input end of the first sampling unit, and the variation trend of the amplitude-frequency characteristic of the first low-pass filter within a preset frequency band is opposite to the variation trend of the coupling degree of the forward coupler within the preset frequency band; the second low-pass filter is connected between the coupling end of the reverse coupler and the input end of the second sampling unit, and the variation trend of the amplitude-frequency characteristic of the second low-pass filter within the preset frequency band is opposite to the variation trend of the coupling degree of the reverse coupler within the preset frequency band. In this embodiment, it should be noted that, for couplers, whether forward couplers or reverse couplers, due to the physical effects of electromagnetic fields, when the frequency of the microwave signal input from the input end increases, the coupling degree also increases. Therefore, when the coupler operates in the working frequency band, the coupling degree fluctuates significantly. To reduce coupling fluctuations in the coupler, a low-pass filter can be added before sampling the coupled signal. The amplitude-frequency characteristic of the added low-pass filter changes in the opposite direction to the coupling degree of the coupler. Therefore, even if the power of the coupled signal increases due to the increase in the frequency of the input microwave signal, the added low-pass filter can reduce the power of the coupled signal, thereby making the coupling degree characteristic nearly flat and avoiding coupling fluctuations.

[0047] Furthermore, in an optional embodiment, the aerosol generating apparatus of this application further includes an output microstrip line and / or an input microstrip line, wherein the output microstrip line is connected between the output terminal of the power amplifier tube and the input terminal of the forward coupler; the input microstrip line is connected to the input terminal of the power amplifier tube. In this embodiment, the output microstrip line and the input microstrip line are used for impedance matching between the power amplifier tube and external circuitry.

[0048] Preferably, the width of the microstrip line at the output end decreases in a stepped manner along the microwave signal transmission direction; the width of the microstrip line at the input end increases in a stepped manner along the microwave signal transmission direction. In this embodiment, it should first be noted that since the internal output impedance of the power amplifier tube is smaller than the external line impedance (50 ohms), during design, impedance matching is required at the output and input ends of the power amplifier tube based on its package structure. Furthermore, since the impedance of the microstrip line is mainly related to its width, and also to its thickness, the thickness of the line and the ground plane medium, and the dielectric constant of the dielectric, when the thickness of the microstrip line, the thickness of the line and the ground plane medium, and the dielectric constant of the dielectric are determined, the closer the microstrip line is to the power amplifier tube, the larger its width, and the closer its impedance is to the internal impedance of the power amplifier tube; the farther away from the power amplifier tube, the smaller the width of the microstrip line, and the closer its impedance is to the external line impedance. Therefore, the design of this stepped width variation of the microstrip line at the output end and the microstrip line at the input end can, on the one hand, reduce the possibility of reflection during microwave signal transmission and reduce the risk of power amplifier tube burnout; on the other hand, it can reduce the power loss of microwave signals and improve the additional efficiency of the power amplifier tube.

[0049] Furthermore, in an optional embodiment, the aerosol generating device of this application further includes at least two filter capacitors, with one end of each filter capacitor connected to different positions on the output microstrip line, and the other end of each filter capacitor grounded. In this embodiment, by connecting filter capacitors with appropriate parameters at different length positions on the output microstrip line, an equivalent multi-order low-pass, low-impedance LC filter can be formed, which can effectively suppress out-of-band harmonics, thereby improving the additional efficiency of the power amplifier tube.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An aerosol generation device, comprising a power amplifier tube for amplifying the generated microwave signal, and an antenna for radiating the amplified microwave signal onto an aerosol generation matrix, characterized in that, It also includes a circulator and an absorption resistor, wherein the input terminal of the circulator is connected to the output terminal of the power amplifier tube, the output terminal of the circulator is connected to the antenna, the isolation terminal of the circulator is connected to the first terminal of the absorption resistor, and the second terminal of the absorption resistor is grounded.

2. The aerosol generating apparatus according to claim 1, characterized in that, Also includes: A forward coupler connected between the output terminal of the power amplifier tube and the input terminal of the circulator, and used to couple the amplified microwave signal; An anti-coupler connected between the isolation terminal of the circulator and the first terminal of the absorption resistor, for coupling the reflected microwave signal.

3. The aerosol generating apparatus according to claim 2, characterized in that, Also includes: A first sampling unit for sampling the microwave signal coupled by the forward coupler; A second sampling unit for sampling the microwave signal coupled by the reverse coupler.

4. The aerosol generating apparatus according to claim 3, characterized in that, The forward coupler includes: a first resistor, and a first transmission microstrip line and a first coupling microstrip line coupled together, wherein a first end of the first transmission microstrip line is connected to the output terminal of the power amplifier tube, and a second end of the first transmission microstrip line is connected to the input terminal of the circulator; the coupling end of the first coupling microstrip line is connected to the input terminal of the first sampling unit, and the isolation end of the first coupling microstrip line is grounded through the first resistor; and / or, The reverse coupler includes a second resistor, and a coupled second transmission microstrip line and a coupled second coupling microstrip line, wherein a first end of the second transmission microstrip line is connected to the isolation terminal of the circulator, and a second end of the second transmission microstrip line is connected to the first end of the absorption resistor; the coupling terminal of the second coupling microstrip line is connected to the input terminal of the second sampling unit, and the isolation terminal of the second coupling microstrip line is grounded through the second resistor.

5. The aerosol generating apparatus according to claim 3, characterized in that, The first sampling unit includes a first inductor and a first detector. The first end of the first inductor and the input end of the first detector are respectively connected to the coupling end of the forward coupler. The second end of the first inductor is grounded. The output end of the first detector is the output end of the first sampling unit. And / or, The second sampling unit includes a second inductor and a second detector. The first end of the second inductor and the input end of the second detector are respectively connected to the coupling end of the reverse coupler. The second end of the second inductor is grounded. The output end of the second detector is the output end of the second sampling unit.

6. The aerosol generating apparatus according to claim 5, characterized in that, The first detector and / or the second detector are zero-bias Schottky detectors.

7. The aerosol generating apparatus according to claim 3, characterized in that, Also includes: A first low-pass filter is connected between the coupling terminal of the forward coupler and the input terminal of the first sampling unit, and the variation trend of the amplitude-frequency characteristic of the first low-pass filter within a preset frequency band is opposite to the variation trend of the coupling degree of the forward coupler within the preset frequency band; and / or, A second low-pass filter is connected between the coupling terminal of the reverse coupler and the input terminal of the second sampling unit, and the variation trend of the amplitude-frequency characteristic of the second low-pass filter in the preset frequency band is opposite to the variation trend of the coupling degree of the reverse coupler in the preset frequency band.

8. The aerosol generating apparatus according to claim 2, characterized in that, Also includes: An output microstrip line connected between the output terminal of the power amplifier tube and the input terminal of the forward coupler; and / or, The input microstrip line is connected to the input terminal of the power amplifier tube.

9. The aerosol generating apparatus according to claim 8, characterized in that, The width of the output microstrip line decreases in a stepped manner along the microwave signal transmission direction. The width of the input microstrip line increases in a stepped manner along the microwave signal transmission direction.

10. The aerosol generating apparatus according to claim 8, characterized in that, It also includes at least two filter capacitors, with one end of each of the at least two filter capacitors connected to different positions on the output microstrip line, and the other end of each of the at least two filter capacitors grounded.

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