CN116965601A - Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof - Google Patents

Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof Download PDF

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Publication number
CN116965601A
CN116965601A CN202310946585.5A CN202310946585A CN116965601A CN 116965601 A CN116965601 A CN 116965601A CN 202310946585 A CN202310946585 A CN 202310946585A CN 116965601 A CN116965601 A CN 116965601A
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CN
China
Prior art keywords
capacitance
electrode
electronic cigarette
tobacco tar
electrodes
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CN202310946585.5A
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Chinese (zh)
Inventor
孙滕谌
王凯
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Beijing Tashan Technology Co ltd
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Beijing Tashan Technology Co ltd
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Priority to CN202310946585.5A priority Critical patent/CN116965601A/en
Publication of CN116965601A publication Critical patent/CN116965601A/en
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/50—Control or monitoring
    • A24F40/51—Arrangement of sensors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A24F40/465—Shape or structure of electric heating means specially adapted for induction heating

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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The invention relates to an electronic cigarette based on surrounding electrodes and an oil quantity detection sensor thereof, wherein the sensor comprises a capacitance-digital conversion circuit (CDC), a processing module, a switch array and an electrode induction component. The electrode sensing component comprises at least three electrodes which are arranged on the electronic cigarette oil storage container and encircle to form a circle, the invention structurally only needs to distribute one circle of electrodes on the electronic cigarette oil storage container, the space requirement of electrode arrangement is lower, the arrangement structure is simple, the arrangement requirement of various electronic cigarette oil storage containers is easy to be met, the cost advantage is achieved, the oil quantity in the container is reflected by the self capacitance or the combination of the self capacitance and the mutual capacitance of at least two electrodes in the first circle of electrode group in the method, and the accurate measurement of the oil quantity can be realized.

Description

Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof
Technical Field
The invention relates to oil quantity detection of electronic cigarettes, in particular to an electronic cigarette oil quantity detection sensor based on capacitance.
Background
The oil storage container of electron cigarette is usually cylinder or cuboid, because need reach the purpose that produces a large amount of inhalable smog in several tens milliseconds, atomizing core uses the heater strip and abandons the ultrasonic wave, the heater strip is located the container bottom basically, the container top is the gas outlet, it can not use to invert, because use the heater strip scheme, need additionally pay attention to the dry combustion method phenomenon when the tobacco tar is spent, in case dry combustion method except damaging atomizing core, will produce a large amount of harmful gas and harm user's health, therefore the electron cigarette field has the demand of monitoring the oil mass of tobacco tar, need carry out the suggestion when the oil mass is fast.
Patent document 202222715106.2 discloses a technical scheme for measuring the amount of smoke by means of measuring the luminous flux, and the amount of oil in an atomization core is obtained by detecting the light returned after passing through an oil storage cavity, calculating and comparing the change of luminous flux data; the technology needs to be configured with hardware such as luminescence, light receiving and the like, is high in cost and not easy to spatially arrange, and on the other hand, the technology has a considerable challenge in accurate identification due to interference of environment brightness change on detection.
The capacitor digital conversion circuit (CDC) in the prior art, such as ADI7142 and ADI7147, adopts a delta-sigma modulation mode to directly convert the measured capacitance value into a digital value by a method of charging and discharging the measured capacitance for many times and comparing the reference capacitance (see U.S. Pat. No. 5,134,401), can improve the measurement sensitivity of the capacitance to 1ff level, easily meets the requirement of a measurement system on the measurement sensitivity of the capacitance, and has the characteristic of immunity to stray capacitance.
Compared with the technology of measuring luminous flux, in the aspect of electronic cigarette oil quantity detection, the capacitance detection technology has the advantages of structure, cost and the like due to the easiness in arrangement of the electrodes.
The patent document 202021711532.3 discloses that when the smoke and oil in the smoke and oil accommodating bin are inclined, the smoke and oil in the smoke and oil accommodating bin can be simultaneously contacted with at least one side wall sensing electrode and at least one bottom surface sensing electrode, the condition that the smoke and oil are exhausted or nearly exhausted is detected, the detection principle depends on that when the side wall sensing electrode and the bottom surface sensing electrode are simultaneously contacted with the smoke and oil and are not simultaneously contacted with the smoke and oil, namely, when the bottom and the side wall sensing electrodes are on and off, the difference of electric parameters such as voltage, current, capacitance and inductance between the two electrodes is judged, only the existence of the smoke and oil in the smoke and oil accommodating bin can be detected, and the quantity of the oil cannot be detected, and the smoke and oil in the smoke and oil accommodating bin is often protected when the oil in the accommodating bin is exhausted, such as power is cut off, and the atomization core basically starts to dry combustion to generate harmful gas.
Patent documents 201590001289.7, 2015180000257. X disclose a technical scheme for measuring the tobacco tar content by using a capacitor, and the key point is that two electrodes are arranged in an oil storage cavity, wherein the two electrodes can be a sheet parallel plate capacitor or a nested annular capacitor, tobacco tar is arranged between the two electrodes, and the change of the tobacco tar quantity is reflected by a mutual capacitance value. 202022615173.8 the technical scheme of measuring the oil quantity in an oil reservoir by arranging a self-capacitance electrode at the bottom of an oil tank is characterized in that the electrode can be arranged in the oil tank to be in contact with the oil, can also be arranged outside a bottom shell of the oil tank to be in non-contact with the oil, and can also be provided with two oil tanks, wherein the two electrodes are respectively used for measuring the respective oil quantity. However, in general, the self-capacitance of the capacitive electrode and the mutual capacitance between the electrodes are affected by the distribution of the tobacco tar, the liquid level angle, and the like in addition to the amount of the tobacco tar in the container, and in the capacitive detection scheme described above, the disturbance of the distribution of the tobacco tar, the liquid level angle, and the like cannot be eliminated, and there is: (1) The tobacco tar is sticky, and if the phenomenon of wall hanging occurs, the problem of inaccurate measurement is caused; (2) The electronic cigarette is placed at a random angle, and the relative angle between the oil liquid level and the oil tank randomly causes the problem of inaccurate measurement; (3) The components and contents of tobacco tar, especially self-matching tobacco tar, are changed, and the dielectric constant, resistivity and light transmittance are changed, so that the problem of inaccurate measurement is caused.
Disclosure of Invention
According to the invention, the capacitance detection scheme is used for detecting the oil quantity in the electronic cigarette oil storage container, and a circle of electrodes are distributed in the electronic cigarette oil storage container so as to achieve the advantages of structure and cost, and meanwhile, higher measurement accuracy is realized.
For this purpose, an electronic cigarette oil quantity detection sensor based on surrounding electrodes is provided, which comprises a capacitance-to-digital conversion circuit (CDC), a processing module and a switchAn array, electrode sensing assembly; the electrode induction assembly comprises a first circle of electrode group, wherein the first circle of electrode group comprises at least three electrodes which are arranged on an electronic cigarette oil storage container and encircle to form a circle, each electrode in the circle is arranged in a mode that tobacco tar which is larger than or equal to low-level early-warning oil quantity in the container can completely submerge at least two of the circle of electrodes or partially submerge at least two of the circle of electrodes in a substantially same submerged area, the difference of the percentage of the submerged area is within 10%, and the electrodes are used for capacitively sensing the liquid level of the tobacco tar; any two submerged electrodes of the first ring electrode group, wherein a series capacitor C is arranged between one electrode and tobacco tar a1 And a series capacitance C between the other electrode and the tobacco tar a2 Is configured to set a known scaling factor k; the capacitance-to-digital conversion circuit is coupled with each electrode through a switch array; the processing module is coupled with the capacitance digital conversion circuit and is used for outputting the oil mass information of the tobacco tar in the oil storage container according to the measured value of at least two electrodes in the first circle of electrode group, wherein the measured value is configured to be the self capacitance of the electrodes or the self capacitance and the mutual capacitance of the electrodes.
The invention only needs to distribute one circle of electrodes on the electronic cigarette oil storage container structurally, the space requirement for electrode arrangement is lower, the arrangement structure is simple, the arrangement requirement of the oil storage containers of various types of electronic cigarettes is easy to meet, the cost advantage is achieved, the oil quantity in the container is reflected by the self capacitance or the combination of the self capacitance and the mutual capacitance of at least two electrodes in the first circle of electrode group in the method, and the accurate measurement of the oil quantity can be realized.
In the present invention, flooding is understood to mean that the electrode is covered by the tobacco tar corresponding to the normal projection of the electrode. When the size of each electrode is set smaller and the adjacent two electrodes in the circle are close to each other, namely the distance is smaller, all tobacco tar which is larger than or equal to low-level early warning oil quantity in the container under the condition of inclination of the electronic cigarette submerges at least two electrodes in the circle; when each electrode is arranged in a long strip shape and the long sides of two adjacent long strips in the circle are close to each other, at least two of the circle electrodes are partially submerged by tobacco tar which is larger than or equal to low-level early warning oil quantity in the container under the condition of inclination of the electronic cigarette, wherein the substantially same submerged areas refer to the difference of the percentage of the submerged areas within 10%, and the percentage of the submerged areas refers to the ratio of the area of the electrode covered by the normal projection of the tobacco tar corresponding to the electrode to the normal projection area of the electrode. It should be understood that the design size of the electrode and the distance between the two adjacent electrodes in the invention are determined according to the shape and the size of the container and the design value of the low-level early warning oil quantity. Preferably, the arrangement mode of each electrode in the first circle of electrode group is further configured to enable the oil liquid surface of the tobacco tar corresponding to the low-level early-warning oil quantity to be submerged to the upper edge, the middle part or the lower edge of each electrode in the first circle of electrode group under the condition that the electronic cigarette is upright.
In the present invention, the scaling factor k is configured to be equal to 1 or may not be equal to 1. The scheme with k equal to 1 can be realized by setting the normal projection area of each electrode corresponding to tobacco tar to be the same and the interval between each electrode and the tobacco tar to be the same, and the scheme is more beneficial to reducing the calculation force and improving the detection speed, and belongs to the preferred scheme. For the case where k is not equal to 1, this may be achieved by setting the difference in area and/or pitch, for example, setting the area of one electrode to half the area of the other electrode, or setting the pitch to 1/3 of the other, or the like.
It is contemplated that the main components of tobacco tar are additives such as glycerin, propylene glycol, water, flavors, nicotine, and the like. Among these, glycerin and propylene glycol are the most major components, and glycerin is extremely low in conductivity, and serves as a dilution and smoke increasing effect, while propylene glycol is only weak in conductivity, so that tobacco tar is substantially insulated. In the invention, the electrode can be arranged to be in direct contact with tobacco tar, for example, the electrode is arranged in the electronic cigarette oil storage container. More optionally, in order to avoid pollution caused by direct contact, and facilitate the matching of the degree of freedom of the components and the content of tobacco tar, the electrode is arranged on the electronic cigarette oil storage container and isolated from oil smoke by an insulating layer, so as to realize non-contact capacitive sensing. For a non-contact version, further, the electrode may be disposed inside the e-cigarette reservoir, and the insulating layer is configured to include an insulating film coating the outer surface of the electrode, e.g., suspended or suspended within the reservoir from contact with the inner wall of the reservoir; alternatively, in view of the convenience of installation, it may be arranged outside the side wall of the electronic cigarette oil storage container, such as on the outer side wall of the electronic cigarette oil storage container or on a cigarette rod outside the electronic cigarette oil storage container (the container is arranged in the cigarette rod, and the electrode on the cigarette rod is aligned with the container after installation), in which case the insulating layer is configured to include the side wall of the electronic cigarette oil storage container and even air between the cigarette rod and the container when arranged on the cigarette rod; or, considering the other side wall of the oil storage container and the firmness and stability of electrode arrangement, the electrode can be preferably arranged in the side wall of the electronic cigarette oil storage container through injection molding or interlayer technology to form an insulation-electrode-insulation three-layer structure, and the side wall of the electronic cigarette oil storage container between the electrode and the lampblack is used as an insulation layer or a part of insulation layer.
As another improvement, the electrode sensing assembly may further include at least two electrodes disposed on a bottom surface of the electronic cigarette oil storage container, and the arrangement of the electrodes on the bottom surface is configured to enable all of the at least two electrodes to be submerged by the tobacco tar greater than or equal to the low-level early-warning oil amount in the container under the condition that the electronic cigarette is standing, and further reflect the oil amount information of the tobacco tar in the oil storage container according to the measured values of the electrodes in the first ring of electrode group under the condition that the electronic cigarette is standing. In this modification, the bottom surface of the container may be an inclined surface, a curved surface or a flat surface.
In the invention, the processing module outputs oil mass information according to the inundation condition of the smoke oil counter electrode, and the invention further comprises: if at least two electrodes in the first ring electrode set have self-capacitance and the difference of the self-capacitance is smaller than a set threshold value, the smoke oil is completely submerged in at least two of the ring electrodes or the at least two of the ring electrodes are partially submerged in the same submerged area, namely the oil quantity is larger than or equal to a low-order quoting threshold value, one electrode with self-capacitance is taken as a first measuring electrode, the other electrode is taken as a second measuring electrode, the capacitance-digital conversion circuit obtains a first capacitance and a second capacitance, and the first capacitance is configured to be turned onOne of a first self-capacitance measurement value acquired through the first measurement electrode, a second self-capacitance measurement value acquired through the second measurement electrode, a third self-capacitance measurement value acquired through the first measurement electrode and the second measurement electrode in parallel, and a first mutual capacitance measurement value acquired through the first measurement electrode and the second measurement electrode, the second capacitance being configured as one of the other three; the processing module constructs a smoke-oil-to-ground distributed capacitance C based on the first capacitance w A first equation with the corresponding series capacitance as a variable, and constructing a tobacco tar-to-ground distribution C based on the second capacitance w The second equation with the corresponding series capacitance as a variable is used for calculating the tobacco tar to ground distribution capacitance C by utilizing an equation set formed by the first equation and the second equation and the proportionality coefficient k w The oil quantity information in the electronic cigarette oil storage container is output, and the oil quantity information can be displayed outwards through a display device, for example, through lamplight matters or through a nixie tube mark; if at least two electrodes in the first circle of electrode group cannot be measured and have self-capacitance, and the difference value of the self-capacitance is smaller than a set threshold value, which indicates that the oil quantity is smaller than a low-level alarm threshold value, the processing module performs oil quantity low-level early warning.
The basic principle of measuring the tobacco tar in the container by the method for measuring the capacitance is based on the characteristic that the dielectric constant of the tobacco tar is far greater than that of air, and the distributed capacitance (self-capacitance) C formed by the tobacco tar in the container to the ground is obtained by measurement and calculation w ，C w Can reflect the volume of tobacco tar in the container. Considering that the ground can be considered as an infinite polar plate, the change of the average distance of the tobacco tar side wall pair formed by the liquid level rise of the fixed container to the ground is negligible, the tobacco tar bottom area and the top area are unchanged for the container with the invariable circumference, the variable area of the tobacco tar is in direct proportion to the height of the tobacco tar, and C w Proportional to the surface area of the tobacco tar and thus to the tobacco tar height, whereas for containers of varying circumference, after the container is formed and fixed, the volume of tobacco tar in the container and the tobacco tar height will also form a fixed mapping relationship, and therefore, can be determined by C w And obtaining liquid level information through conversion. For dynamic fluctuation of liquid level caused by vibration, inclination, tobacco tar wall hanging and the like, thereby guidingFailure to define an exact volume can be resolved by obtaining an exact volume of tobacco tar, due to C w In proportion to the surface area of the tobacco tar, the change of the surface area of the tobacco tar under the fluctuation condition is small, so that C is calculated by measuring w The volume of the tobacco tar in the container is reflected, the influence of the distribution of the tobacco tar, the liquid level angle and the like can be eliminated, and higher measurement accuracy is further achieved. Calculation C w In the process of (a), the proportional coefficient k is known by structural setting, and the self capacitance or the mutual capacitance of the first measuring electrode and the second measuring electrode is measured twice, because the self capacitance or the mutual capacitance is C w And C a (series capacitor C) a Is susceptible to external changes and thus affects the accuracy of the measurement), so that each measurement can construct a C w And C a Is to series capacitor C by using a system of equations consisting of two equations a Eliminating primordial energy to construct a tobacco tar to ground distributed capacitor C w Monotonic function with the first capacitor and the second capacitor, and then solving C by using the first capacitor and the second capacitor obtained by two measurements w . In this method, it is necessary to ensure C of both electrodes a The ratio is known, under the precondition that, due to the series capacitance C a Is eliminated, thus can eliminate C a Measurement errors caused by C w Accurately reflects the characteristic of volume, overcomes the influence of changes due to vibration, distribution, angle change and the like, and can also overcome the change of environmental temperature and humidity (the influence of environmental temperature and humidity change C a Numerical value of (a) caused by the measurement error. In addition, because the dielectric constant of the tobacco tar is greatly different from that of air, even if a user adds other additives with different tastes into the tobacco tar, the dielectric constant of the tobacco tar after self-preparation is sufficiently different from that of the air, and the influence on the calculation of the volume of the tobacco tar is weak.
In the present invention, the container may be configured such that the top surface area of the entrained tobacco tar does not change with increasing height, i.e., the inner perimeter of the container does not change with increasing height, e.g., a column (cylinder, rectangular column, etc.), where the bottom area and top area are unchanged during the rising of tobacco tar, the variable area of tobacco tar is proportional to the height of the liquid level, and C w Positive with the surface area of tobacco tarThe ratio is thus proportional to the smoke height, so the treatment module can be based on C w Proportional relationship with liquid level by C w And converting the liquid level of the tobacco tar. It may also be configured such that the surface area of the top surface of the entrained tobacco tar changes with increasing height, i.e. the inner circumference of the container changes with increasing height, e.g. a cone or other irregular shape, in which case, since the inner circumference of the container corresponding to each height is fixed after the container is fixed in shape, the liquid level may be obtained by conversion, e.g. by calculating the mapping of the inner circumference (or tobacco tar volume) of the container to the height (the list establishes the value of the inner circumference (or tobacco tar volume) corresponding to each height), writing the mapping in advance into the processing module, where the processing module calculates C w The liquid level information can be obtained by utilizing the conversion of the mapping relation.
As an improvement, on the basis that the container is configured to ensure that the surface area of the top surface of the carried tobacco tar does not change along with the rise of the height, the first capacitor is configured as a first self-capacitance measurement value or a second self-capacitance measurement value, and the second capacitor is configured as a first mutual capacitance measurement value, and at the moment, the tobacco tar distributes the capacitance C to the ground w Is further configured to:
wherein C is s Is a first capacitance, C x Is the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error. In this scheme, the first capacitor is configured as a self-capacitance, the second capacitor is configured as a mutual capacitance, and a more accurate measurement result is obtained by using a self-capacitance and mutual capacitance conversion mode.
Alternatively, as another improvement, on the basis that the container is configured such that the surface area of the top surface of the tobacco tar carried by the container does not change with the rise of the height, the first capacitor may be configured as a first self-capacitance measurement value or a second self-capacitance measurement value, and the second capacitor may be configured as a third self-capacitance measurement value, where the tobacco tar distributes the capacitance C to the ground w Is further configured to:
wherein C is s1 Is a first capacitance, C s2 Is the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error. In this scheme, the first capacitor is configured as a self-capacitance, the second capacitor is configured as a self-capacitance after the area change (two electrodes are combined by an analog switch to be connected in parallel), and a more accurate measurement result is obtained by using the self-capacitance area change twice measurement mode.
In the invention, the positive correlation between the submerged area and the self-capacitance is followed, for example, the larger the submerged area is, the larger the value of the self-capacitance is, the processing module can determine the submerged degree of each electrode by tobacco tar according to the self-capacitance of the electrode, namely, the processing module can sense the submerged state of the electrode by tobacco tar through the self-capacitance without additionally arranging a sensing device for detecting the submerged state. Further, when the number of the electrodes with self-capacitance and the difference value of the self-capacitance between the two electrodes is larger than two, the first two corresponding electrodes with larger self-capacitance are respectively used as the first measuring electrode and the second measuring electrode, so that the testing accuracy is improved.
In order to further improve the test accuracy and avoid the influence caused by detection at the moment of volume change of tobacco tar such as smoking by a user, the processing module is configured to acquire the first capacitor and the second capacitor for calculation when the tobacco tar in the electronic cigarette oil storage container is in a steady state, wherein when the capacitances acquired on the same electrode at least twice adjacently are the same, the tobacco tar in the electronic cigarette oil storage container is determined to be in a steady state; or when the oil quantity information calculated by at least two adjacent measurements is the same, determining that the tobacco tar in the electronic cigarette oil storage container is in a steady state. When the electronic cigarette is stationary, for example, the oil quantity is detected to be lower than a low-level alarm threshold value, and when the electronic cigarette is stationary, steady state detection can be set by combining the configuration of the electronic cigarette (the electronic cigarette is operated in a low-power consumption mode in a normal state, and when a user needs to smoke, negative pressure is used as a switch to switch on an atomization core power supply), and when the user smoke, the negative pressure is detected to enable the switch to be conducted, oil quantity prompt, such as sound and/or light prompt, is carried out, so that the purpose of saving power consumption is achieved.
The electronic cigarette comprises the electronic cigarette oil quantity detection sensor.
Drawings
FIG. 1 shows a schematic diagram of an electronic smoke detection sensor composition based on surrounding electrodes;
FIG. 2 shows a schematic view of at least two submerged electrodes in the case of tilting an e-cigarette;
FIG. 3-1 shows a schematic view of an electrode arrangement inside a container in direct contact with tobacco tar;
FIG. 3-2 shows a schematic view of an electrode arrangement inside a container isolated from tobacco tar by an insulating layer;
3-3 show schematic views of electrodes disposed on the inner wall of the container in contact with tobacco smoke and isolated by an insulating layer;
FIGS. 3-4 show schematic views of the electrodes disposed inside the side walls of the container;
figures 3-5 show schematic views of the electrode arrangement outside the side wall of the container;
figures 3-6 show schematic views of electrodes disposed on an inner wall of an e-vaping rod;
FIG. 4 shows a schematic view of the electrode arrangement on the bottom surface of the container;
FIG. 5 shows a schematic diagram of single electrode self-capacitance;
FIG. 6 shows a schematic diagram of the mutual capacitance of two electrodes;
FIG. 7 shows a schematic diagram of a two electrode combined self-capacitance;
fig. 8 shows a schematic view of an addition prompting device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, an electronic smoke detection sensor based on surrounding electrodes comprises a capacitance-to-digital conversion circuit (CDC) 100, a processing module 200, a switch array 300, and an electrode sensing assembly 400; the electrode sensing assembly comprises a first circle of electrode groups, wherein the first circle of electrode groups comprise at least three electrodes 401, 402 and 403 which are arranged on the electronic cigarette oil storage container and encircle to form a circle.
As shown in fig. 2, the arrangement of the electrodes in the first ring electrode set 410 is configured such that, in the case of tilting the electronic cigarette 500, tobacco tar in the container that is greater than or equal to the low-level early-warning oil amount 600 can completely submerge at least two of the first ring electrode set 410 or partially submerge at least two of the first ring electrode set 410 with a substantially identical submerged area.
As shown in fig. 3-1, electrodes 401, 402 may be disposed inside the e-cigarette reservoir 500 in direct contact with the tobacco tar 600. As shown in fig. 3-2, in order to avoid pollution caused by direct contact of the electrodes 401 and 402 with the smoke oil 600, and facilitate the matching of the smoke oil components and the content of the smoke oil, the electrodes 401 and 402 are isolated from the smoke oil 600 by the insulating layer 700. As shown in fig. 3-3, electrodes 401, 402 may be disposed on the inner wall of the e-cigarette reservoir 500, with the electrodes 401, 402 in direct contact with the tobacco tar 600. Or the electrodes 401, 402 are isolated from the soot 600 by an insulating layer 700. As shown in fig. 3-4, the electrodes 401, 402 may be disposed inside a sidewall of the e-cigarette reservoir 500, with the sidewall providing isolation of the electrodes 401, 402 from the tobacco tar 600. As shown in fig. 3-5, the electrodes 401, 402 may be disposed outside the sidewall of the e-cigarette reservoir 500, with the sidewall providing isolation of the electrodes 401, 402 from the tobacco tar 600. As shown in fig. 3-6, the electrodes 401, 402 may be disposed on an inner wall of the e-beam 800.
As shown in fig. 4, as another improvement, the electrodes 401 and 402 may be disposed on the bottom surface of the electronic cigarette oil storage container 500, and the electronic cigarette can enable all the electrodes 401 and 402 to be submerged by the tobacco tar in the container that is greater than or equal to the low-level early-warning oil amount under the condition that the electronic cigarette is standing.
As shown in fig. 5 and 6, the surface area of the top surface of the tobacco tar in the electronic cigarette oil storage container 500 does not change with the rise of the height, and the two submerged electrodes 401 and 402 in the first electrode group 410 are connected in series with the capacitance C between the electrode 401 and the tobacco tar 600 a1 Series capacitance C between electrode 402 and tobacco tar 600 a2 . Between the measuring electrode 401 and the tobacco tar 600Series capacitor C a1 And a series capacitance C between the measurement electrode 420 and the tobacco tar 600 a2 Ratio (C) a1 /C a2 ) To set a known scaling factor k.
The first capacitance is configured as a series capacitance C between the measurement electrode 401 and the tobacco tar 600 a1 Its self-capacitance measurement result is C a1 Series capacitance with CwFrom the measurement results, a C can be constructed a1 And C w Functional equation of->Capacitance and C between measuring electrode 402 and tobacco tar 600 a1 Is a known relationship of: c (C) a2 ＝k*C a1 Measurement of mutual capacitance of measurement electrode 401 and measurement electrode 402 +.>At this time, the tobacco tar 600 distributes the capacitance C to ground w Is further configured to:
wherein C is s Is a first capacitance, C x Is the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error. In this scheme, the first capacitor is configured as a self-capacitance, the second capacitor is configured as a mutual capacitance, and a more accurate measurement result is obtained by using a self-capacitance and mutual capacitance conversion mode.
As shown in fig. 5 and 7, the first capacitance may be configured as a measurement value of the self-capacitance of the measurement electrode 401 or a measurement value of the self-capacitance of the measurement electrode 402, and the second capacitance may be configured as a measurement value of the self-capacitance after the measurement electrode 401 and the measurement electrode 402 are combined. The measurement result is that by using the measuring electrode 401 or the measuring electrode 402Transduction get->Capacitance of the other electrode and C a1 The relationship is known: c (C) a2 ＝k*C a1 . The self-capacitance measurement result after combining the measurement electrode 401 and the measurement electrode 402 is +.> Transduction get->At this time, the tobacco tar 600 distributes the capacitance C to ground w Is further configured to: />
Wherein C is s1 Is a first capacitance, C s2 Is the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error. In this scheme, the first capacitor is configured as a self-capacitance, the second capacitor is configured as a self-capacitance after the area change (two electrodes are combined by an analog switch to be connected in parallel), and a more accurate measurement result is obtained by using the self-capacitance area change twice measurement mode.
As shown in fig. 8, the prompting device 900 is coupled to the processing module 200 to prompt the oil amount by sound and/or light.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (16)

1. Electronic cigarette oil mass detection sensor based on encircling electrode, its characterized in that:
the device comprises a capacitance-to-digital conversion circuit, a processing module, a switch array and an electrode induction assembly;
the electrode induction assembly comprises a first circle of electrode group, wherein the first circle of electrode group comprises at least three electrodes which are arranged on an electronic cigarette oil storage container and encircle to form a circle, each electrode in the circle is arranged in a mode that tobacco tar which is larger than or equal to low-level early-warning oil quantity in the container can completely submerge at least two of the circle of electrodes or partially submerge at least two of the circle of electrodes in a substantially same submerged area, the difference of the percentage of the submerged area is within 10%, and the electrodes are used for capacitively sensing the liquid level of the tobacco tar;
any two submerged electrodes of the first ring electrode group, wherein a series capacitor C is arranged between one electrode and tobacco tar a1 And a series capacitance C between the other electrode and the tobacco tar a2 Is configured to set a known scaling factor k;
the capacitance-to-digital conversion circuit is coupled with each electrode through a switch array;
the processing module is coupled with the capacitance digital conversion circuit and is used for outputting the oil mass information of the tobacco tar in the oil storage container according to the measured value of at least two electrodes in the first circle of electrode group, wherein the measured value is configured to be the self capacitance of the electrodes or the self capacitance and the mutual capacitance of the electrodes.
2. The electronic smoke volume detection sensor of claim 1, wherein the arrangement of the electrodes in the first set of electrodes is further configured to:
under the condition that the electronic cigarette stands upright, the oil level of tobacco tar corresponding to the low-level early-warning oil quantity is submerged to the upper edge, the middle part or the lower edge of each electrode in the first circle of electrode group.
3. The electronic cigarette oil amount detection sensor according to claim 1, wherein: the scaling factor k is configured to be equal to 1.
4. The electronic smoke volume detection sensor of claim 3 wherein the implementation of the scaling factor k is configured to:
any two submerged electrodes have the same normal projection area corresponding to the tobacco tar and the same distance from the tobacco tar.
5. The electronic cigarette oil amount detection sensor according to claim 1, wherein: the electrode is arranged inside the electronic cigarette oil storage container and is in contact with the tobacco tar.
6. The electronic cigarette oil amount detection sensor according to claim 1, wherein: the electrode is arranged in the electronic cigarette oil storage container and is contacted with the tobacco tar through the insulating layer.
7. The electronic cigarette oil amount detection sensor according to claim 6, wherein:
the electrode is configured inside the electronic cigarette oil storage container, and the insulating layer is configured to comprise an insulating film wrapping the outer surface of the electrode; or alternatively
The electrode is configured outside the side wall of the electronic cigarette oil storage container, and the insulating layer is configured to comprise the side wall of the electronic cigarette oil storage container; or alternatively
The electrode is configured inside a sidewall of the e-cigarette oil reservoir, and the insulating layer is configured to include the sidewall of the e-cigarette oil reservoir between the electrode and the tobacco tar.
8. The electronic cigarette oil amount detection sensor according to claim 1, wherein: the electrode induction assembly further comprises at least two electrodes arranged on the bottom surface of the electronic cigarette oil storage container, and the arrangement of the electrodes on the bottom surface is configured to enable tobacco tar which is larger than or equal to low-level early warning oil quantity in the container to be capable of completely submerging at least two electrodes on the surface under the condition that the electronic cigarette is erected.
9. The electronic fuel quantity detection sensor according to claim 1, wherein the processing module outputs fuel quantity information according to a flooding condition of the fuel counter electrode, and further comprises:
if at least two electrodes in the first circle of electrode group are measured to have self-capacitance, and the difference value of the self-capacitance between the electrodes is smaller than a set threshold value, taking one electrode with the self-capacitance as a first measurement electrode, the other electrode as a second measurement electrode, and acquiring a first capacitance and a second capacitance by a capacitance digital conversion circuit, wherein the first capacitance is configured as one of a first self-capacitance measured value acquired by the first measurement electrode, a second self-capacitance measured value acquired by the second measurement electrode, a third self-capacitance measured value acquired by the first measurement electrode and the second measurement electrode in parallel, and a first mutual capacitance measured value acquired by the first measurement electrode and the second measurement electrode, and the second capacitance is configured as one of the other three; the processing module constructs a smoke-oil-to-ground distributed capacitance C based on the first capacitance w A first equation with the corresponding series capacitance as a variable, and constructing a tobacco tar-to-ground distribution C based on the second capacitance w The second equation with the corresponding series capacitance as a variable is used for calculating the tobacco tar to ground distribution capacitance C by utilizing an equation set formed by the first equation and the second equation and the proportionality coefficient k w Outputting the oil quantity information in the electronic cigarette oil storage container;
otherwise, the processing module performs low-level oil mass early warning.
10. The electronic cigarette oil amount detection sensor according to claim 9, wherein:
the processing module determines the degree of flooding of each electrode with tobacco tar according to the self-capacitance of the electrode.
11. The electronic cigarette oil amount detection sensor according to claim 10, wherein:
when the number of the electrodes with self-capacitance and the difference value of the self-capacitance between the electrodes is smaller than the set threshold value is larger than two, the electrodes corresponding to the first two bits with larger self-capacitance are respectively used as the first measuring electrode and the second measuring electrode.
12. The electronic cigarette oil amount detection sensor according to claim 9, wherein:
the processing module is configured to acquire the first capacitor and the second capacitor for calculation when tobacco tar in the electronic cigarette oil storage container is in a steady state.
13. The electronic cigarette oil amount detection sensor according to claim 12, wherein:
when the capacitances acquired on the same electrode are the same at least twice, judging that tobacco tar in the electronic cigarette oil storage container is in a steady state; or alternatively
And when the oil quantity information calculated by at least two adjacent measurements is the same, judging that the tobacco tar in the electronic cigarette oil storage container is in a steady state.
14. The electronic cigarette oil amount detection sensor according to claim 9, wherein:
the first capacitance is configured as a first self-capacitance measurement or a second self-capacitance measurement, the second capacitance is configured as a first mutual capacitance measurement;
the electronic cigarette oil storage container is configured to ensure that the surface area of the top surface of tobacco tar borne by the electronic cigarette oil storage container is unchanged along with the rise of the height;
the tobacco tar is distributed with the capacitance C to the ground w Is further configured to:
wherein C is s For the first capacitance, C x For the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error.
15. The electronic cigarette oil amount detection sensor according to claim 9, wherein:
the first capacitance is configured as a first self-capacitance measurement or a second self-capacitance measurement, the second capacitance is configured as a third self-capacitance measurement;
the container is configured such that the surface area of the top surface of the tobacco tar carried by the container does not change as the height rises;
the tobacco tar is distributed with the capacitance C to the ground w Is further configured to:
wherein C is s1 For the first capacitance, C s2 For the second capacitance, k 1 0.9-1.1, k 2 The value is allowed for the error.
16. An electronic cigarette comprising the electronic cigarette oil amount detection sensor according to any one of claims 1 to 15.
CN202310946585.5A 2023-07-28 2023-07-28 Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof Pending CN116965601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310946585.5A CN116965601A (en) 2023-07-28 2023-07-28 Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310946585.5A CN116965601A (en) 2023-07-28 2023-07-28 Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof

Publications (1)

Publication Number Publication Date
CN116965601A true CN116965601A (en) 2023-10-31

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Application Number Title Priority Date Filing Date
CN202310946585.5A Pending CN116965601A (en) 2023-07-28 2023-07-28 Electronic cigarette based on surrounding electrode and oil quantity detection sensor thereof

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Country Link
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