CN112515245A - Pressure difference sensor and electronic cigarette - Google Patents
Pressure difference sensor and electronic cigarette Download PDFInfo
- Publication number
- CN112515245A CN112515245A CN202011410901.XA CN202011410901A CN112515245A CN 112515245 A CN112515245 A CN 112515245A CN 202011410901 A CN202011410901 A CN 202011410901A CN 112515245 A CN112515245 A CN 112515245A
- Authority
- CN
- China
- Prior art keywords
- frequency
- unit
- differential pressure
- pressure sensor
- capacitance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 79
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 239000000758 substrate Substances 0.000 claims description 19
- 230000002596 correlated effect Effects 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 claims description 5
- 108010001267 Protein Subunits Proteins 0.000 claims 1
- 230000000391 smoking effect Effects 0.000 abstract description 14
- 239000000779 smoke Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 19
- 239000003990 capacitor Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 235000013355 food flavoring agent Nutrition 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- 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
- A24F40/50—Control or monitoring
- A24F40/53—Monitoring, e.g. fault detection
Abstract
The embodiment of the invention discloses a differential pressure sensor and an electronic cigarette. The differential pressure sensor includes: the capacitive pressure sensing element is used for sensing the pressure difference between the first pressure environment and the second pressure environment, and the capacitance value of the capacitive pressure sensing element is in positive correlation with the pressure difference; the processing module is electrically connected with the capacitive pressure sensing element and is used for outputting an interrupt signal and a frequency signal according to the capacitance value. Compared with the prior art, the embodiment of the invention can detect the pressure in real time, and accordingly, the system controls the atomizing power and the smoke quantity of the electronic cigarette atomizer according to the smoking force, thereby bringing finer smoking experience to customers.
Description
Technical Field
The embodiment of the invention relates to the technical field of sensors, in particular to a differential pressure sensor and an electronic cigarette.
Background
With the development of sensor technology, the application range of the sensor is wider and wider. Among them, the differential pressure sensor is widely used in electronic devices such as electronic cigarettes as a sensor for detecting air pressure.
Taking an electronic cigarette as an example, the electronic cigarette does not contain harmful ingredients such as tar and suspended particles, and the tobacco tar of the electronic cigarette can be flavored by adding flavoring agents with different ingredients, so that a user can select the flavor of the tobacco tar according to own preference, and therefore, the electronic cigarette is favored by people. The existing pressure difference sensor applied to the electronic cigarette is in switch type output, namely, when the pressure change exceeds a threshold value during smoking, high/low level output is triggered, and smoking behavior is indicated. However, the existing differential pressure sensor cannot reflect the magnitude of the suction force in real time, thereby affecting the user experience.
Disclosure of Invention
The embodiment of the invention provides a pressure difference sensor and an electronic cigarette, which are used for detecting the pressure in real time and improving the user experience.
In a first aspect, an embodiment of the present invention provides a differential pressure sensor, including:
a capacitive pressure sensing element located between a first pressure environment and a second pressure environment; the capacitance type pressure sensing element is used for sensing the pressure difference between the first pressure environment and the second pressure environment, and the capacitance value of the capacitance type pressure sensing element is positively correlated with the pressure difference;
the processing module is electrically connected with the capacitive pressure sensing element and is used for outputting an interrupt signal and a frequency signal according to the capacitance value;
the processing module comprises a capacitance-frequency conversion unit, a reference frequency unit, a digital processing unit and an output port unit; the capacitance-frequency conversion unit is electrically connected with the capacitance type pressure sensing element and is used for converting the capacitance value into a measurement frequency; the reference frequency unit is used for outputting a reference frequency; the digital processing unit is electrically connected with the capacitance-frequency conversion unit and the reference frequency unit and is used for outputting a judgment result according to the measurement frequency, the reference frequency and a built-in threshold setting parameter; and the output port unit is electrically connected with the digital processing unit and is used for outputting the interrupt signal and the frequency signal according to the judgment result and the measurement frequency.
Optionally, the digital processing unit comprises:
the frequency measurement subunit is electrically connected with the capacitance-frequency conversion unit and the reference frequency unit and is used for calculating according to the measurement frequency and the reference frequency to obtain a frequency measurement result;
and the logic judgment subunit is used for obtaining the judgment result according to the frequency measurement result and the threshold setting parameter.
Optionally, the digital processing unit further comprises: and the storage subunit is electrically connected with the logic judgment subunit and is used for storing the threshold setting parameter and transmitting the threshold setting parameter to the logic judgment subunit.
Optionally, the storage subunit is electrically connected to the frequency measurement subunit, and the storage subunit is further configured to store a frequency calibration parameter and transmit the frequency calibration parameter to the frequency measurement subunit;
and the frequency measurement sub-unit is also used for calculating according to the frequency calibration parameter, the measurement frequency and the reference frequency to obtain a calibrated frequency measurement result.
Optionally, the determination result is a high level or a low level;
setting the frequency measurement result to be smaller than the threshold setting parameter, wherein the judgment result is a low level; the frequency measurement result is greater than the threshold setting parameter, and the judgment result is a high level;
or setting the frequency measurement result to be smaller than the threshold setting parameter, wherein the judgment result is a high level; the frequency measurement result is greater than the threshold setting parameter, and the judgment result is a low level.
Optionally, the frequency signal is a square wave;
if the frequency measurement result is greater than the threshold setting parameter, the output port unit outputs the frequency signal; if the frequency measurement result is smaller than the threshold setting parameter, the output port unit outputs a constant level signal;
or, the output port unit outputs the frequency signal when the frequency measurement result is less than, equal to, or greater than the threshold setting parameter.
Optionally, the frequency signal is a square wave;
setting the frequency of the measuring frequency to be larger, and the square wave frequency of the frequency signal to be larger;
alternatively, the greater the frequency at which the measurement frequency is set, the smaller the square wave frequency of the frequency signal.
Optionally, the capacitance-frequency conversion unit comprises an RC oscillator, an LC oscillator, or a multivibrator;
the reference frequency unit includes an RC oscillator, an LC oscillator, or a multivibrator.
Optionally, the capacitance-frequency conversion unit further includes a calibration capacitor, and the calibration capacitor is used for accessing the circuit during frequency calibration.
Optionally, the output port unit includes:
the first buffer is used for buffering and outputting the judgment result to generate the interrupt signal;
and the second buffer is used for carrying out buffer output according to the measurement frequency and the judgment result to generate the frequency signal.
Optionally, the processing module comprises an application specific integrated circuit chip;
the capacitive pressure sensing element comprises a micro-electromechanical system sensor.
Optionally, the differential pressure sensor further comprises:
the device comprises a substrate and a shell fixedly connected with the substrate; the substrate comprises a first air hole which is communicated with a first pressure environment; the shell comprises a second air hole which is communicated with a second pressure environment; the capacitive pressure sensing element covers the first air hole; the processing module is arranged on the substrate.
In a second aspect, an embodiment of the present invention further provides an electronic cigarette, including: the pressure differential sensor according to any embodiment of the present invention, wherein the pressure differential sensor is disposed on the electronic cigarette.
The pressure difference sensor comprises a capacitance type pressure sensing element and a processing module, wherein the capacitance value of the capacitance type pressure sensing element is in positive correlation with the pressure difference, and the processing module is used for outputting an interrupt signal and a frequency signal according to the capacitance value. Wherein the interrupt signal is indicative of whether the pressure differential exceeds a threshold and the frequency signal is indicative of the magnitude of the pressure differential. Therefore, the embodiment of the invention not only can output the trigger signal, but also can detect the pressure in real time, thereby being beneficial to improving the user experience. In addition, on one hand, in the electronic equipment, the differential pressure can be measured only by arranging one differential pressure sensor provided by the embodiment of the invention, so that the cost is reduced, and the structure of the electronic equipment is simplified; on the other hand, in the electronic device, the differential pressure sensor provided by the embodiment of the invention can not only output the interrupt signal, but also collect and output the frequency signal representing the magnitude of the differential pressure in real time, so that a main control chip is not required to collect the pressure signal in real time. Compared with the main control chip, the differential pressure sensor has lower power consumption, so that the embodiment of the invention is beneficial to reducing the overall power consumption of the electronic equipment. In summary, on the basis of reducing cost and power consumption, the system controls the atomization power and the smoke amount of the electronic cigarette atomizer according to the smoking strength, so as to bring finer smoking experience to the client.
Drawings
Fig. 1 is a schematic structural diagram of a differential pressure sensor according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a differential pressure sensor according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of another differential pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 4 is a signal waveform diagram of a differential pressure sensor according to an embodiment of the present invention;
FIG. 5 is a waveform diagram of another differential pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 6 is a waveform diagram of a signal from another differential pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 7 is a waveform diagram of a signal from another differential pressure sensor provided in accordance with an embodiment of the present invention;
fig. 8 is a signal waveform diagram of another differential pressure sensor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Embodiments of the present invention provide a differential pressure sensor, which may be, for example, an electronic cigarette sensor applied to an electronic cigarette. Fig. 1 is a schematic structural diagram of a differential pressure sensor according to an embodiment of the present invention, and fig. 2 is a schematic circuit diagram of the differential pressure sensor according to the embodiment of the present invention. Referring to fig. 1 and 2, the differential pressure sensor includes: a capacitive pressure sensing element 106 and a processing module 105.
The capacitive pressure sensing element 106 is located between a first pressure environment and a second pressure environment. Illustratively, on the capacitive pressure sensing element 106 is a first pressure environment, such as the environment of the electronic smoke flow channel; the capacitive pressure sensing element 106 is exposed to a second pressure environment, such as the atmosphere outside the e-cigarette. The capacitive pressure sensing element 106 is configured to sense a differential pressure between a first pressure environment and a second pressure environment, and a capacitance value of the capacitive pressure sensing element 106 is positively correlated to the differential pressure. In an electronic product having an airflow channel such as an electronic cigarette, a smoking operation causes a change in the flow rate of gas in the airflow channel, and the flow rate of gas in the airflow channel affects the pressure in the airflow channel to generate a negative pressure, thereby causing a change in the capacitance value of the capacitive pressure sensor 106. Thus, the capacitive pressure sensing element 106 can measure not only the pressure relative to the atmosphere, but also the flow rate of the airflow path.
A processing module 105 is electrically connected to the capacitive pressure sensing element 106, the processing module 105 being adapted to operate in accordance withCapacitance valueThe interrupt signal and the frequency signal are output. The interrupt signal is a signal indicating whether or not the differential pressure exceeds a threshold value, and for example, in the case of an electronic cigarette sensor, the interrupt signal is a signal indicating the presence or absence of a smoking operation. Frequency signalThe sign refers to a signal indicative of the magnitude of the pressure differential, for example, for an electronic smoke sensor, the frequency signal refers to a signal indicative of the magnitude of the current suction or flow. In practical applications, two ports (port 205 and port 206, respectively) may be provided to output the interrupt signal and the frequency signal, respectively.
Specifically, the processing module 105 includes a capacitance-frequency conversion unit 209, a reference frequency unit 208, a digital processing unit 210, and an output port unit 211. The capacitance-frequency conversion unit 209 is electrically connected to the capacitive pressure sensing element 106 for converting the capacitance value into a measurement frequency. The reference frequency unit 208 is used for outputting a reference frequency, which does not change with the change of the external pressure difference and can be used as a reference for frequency measurement. The digital processing unit 210 is electrically connected with the capacitance-frequency conversion unit 209, and the digital processing unit 210 is electrically connected with the reference frequency unit 208, and the digital processing unit 210 is configured to output a determination result according to the received measurement frequency and the reference frequency and by combining with a threshold setting parameter built therein. The determination result may indicate whether the differential pressure exceeds a threshold value. The output port unit 211 is electrically connected to the digital processing unit 210, and is configured to output an interrupt signal and a frequency signal according to the determination result and the measured frequency. Wherein, the interrupt signal corresponds to the judgment result, and the driving capability of the interrupt signal is greater than that of the judgment result; the frequency signal corresponds to the measurement frequency, the driving capability of the frequency signal is greater than that of the measurement frequency, and the frequency signal reflects the magnitude of the measured differential pressure in real time, and the capacitance value of the capacitive pressure sensing element 106 is positively correlated with the differential pressure, so the frequency signal is positively correlated with the differential pressure.
The differential pressure sensor provided by the embodiment of the invention comprises a capacitive pressure sensing element 106 and a processing module 105, wherein the capacitance value of the capacitive pressure sensing element 106 is in positive correlation with the differential pressure, and the processing module 105 is used for outputting an interrupt signal and a frequency signal according to the capacitance value. Wherein the interrupt signal is indicative of whether the pressure differential exceeds a threshold and the frequency signal is indicative of the magnitude of the pressure differential. Therefore, the embodiment of the invention not only can output the trigger signal, but also can detect the pressure in real time, thereby being beneficial to improving the user experience. In addition, on one hand, in the electronic equipment, the differential pressure can be measured only by arranging one differential pressure sensor provided by the embodiment of the invention, so that the cost is reduced, and the structure of the electronic equipment is simplified; on the other hand, in the electronic device, the differential pressure sensor provided by the embodiment of the invention can not only output the interrupt signal, but also collect and output the frequency signal representing the magnitude of the differential pressure in real time, so that a main control chip is not required to collect the pressure signal in real time. And compared with the main control chip, the power consumption of the differential pressure sensor is lower (for example, the power consumption of the differential pressure sensor can be one ten thousandth of that of the main control chip), so that the power consumption of the whole electronic equipment is favorably reduced. In summary, on the basis of reducing cost and power consumption, the system controls the atomization power and the smoke amount of the electronic cigarette atomizer according to the smoking strength, so as to bring finer smoking experience to the client.
In the above embodiments, optionally, the processing module 105 comprises an application specific integrated circuit chip. The integrated circuit chip is called ASIC chip for short, and the ASIC chip is a CMOS circuit manufactured on a silicon substrate. The capacitive pressure sensing element 106 comprises a micro-electromechanical system sensor. The MEMS sensor is a micro-film structure processed and formed on a silicon substrate, and the micro-film and a back plate which is also positioned on the silicon substrate form a capacitor. The change of the external pressure causes the membrane to deform, but the back plate does not deform, so that the distance between the two plates of the capacitor changes, and the capacitance value correspondingly changes.
With continued reference to fig. 1, based on the above embodiments, optionally, the differential pressure sensor further includes: a substrate 101 and a housing 108 fixedly connected to the substrate 101; the substrate 101 comprises a first air hole 102, and the first air hole 102 is communicated with a first pressure environment; the housing 108 comprises a second air hole 107, and the second air hole 107 is communicated with a second pressure environment; the capacitive pressure sensing element 106 covers the first air hole 102; the processing module 105 is disposed on the substrate 101. The processing module 105 is connected to the capacitive pressure sensing element 106 through a connection line 109, and the processing module 105 is connected to the substrate 101 through a connection line 110, where the connection line 109 and the connection line 110 are made of the same material, such as gold wire, which has a better electrical conductivity. The substrate 101 is used to support the housing 108 and to bring out signals output by the processing module 105 onto a main board of the electronic device. The housing 108 is used to enclose the differential pressure sensor, and the material of the housing 108 may be, for example, metal or plastic. Illustratively, the capacitive pressure sensing element 106 is fixed on the substrate 101 by means of an adhesive glue 103, and the processing module 105 is fixed on the substrate 101 by means of an adhesive glue 104.
In addition to the above embodiments, there are various ways of setting the digital processing unit 210, and some of them will be described below, but the present invention is not limited thereto.
With continued reference to fig. 2, in one embodiment of the present invention, digital processing unit 210 is optionally implemented with digital circuitry. The digital processing unit 210 includes: a frequency measurement subunit 207 and a logic determination subunit 212. The frequency measurement sub-unit 207 is electrically connected with the capacitance-frequency conversion unit 209 and the reference frequency unit 208, and is used for calculating according to the measurement frequency and the reference frequency to obtain a frequency measurement result. For example, the measurement frequency may be measured by a reference frequency, or the measurement frequency may be measured by a reference frequency, thereby obtaining a measurement result. The logic determining subunit 212 is configured to obtain a determining result according to the frequency measurement result and the threshold setting parameter. By the arrangement, the logic structure of the digital processing unit 210 is simple and easy to implement.
With continued reference to fig. 2, in an embodiment of the present invention, optionally, the digital processing unit 210 further includes a storage subunit 214, and the storage subunit 214 is electrically connected to the logic determination subunit 212, and is configured to store the threshold setting parameter and transmit the threshold setting parameter to the logic determination subunit 212. The storage subunit 214 may be, for example, a non-volatile memory. Illustratively, the output port unit 211 is electrically connected to the storage subunit 214, and the threshold setting parameter is written into the storage subunit 214 through the output port unit 211 before the factory shipment of the differential pressure sensor.
With continued reference to fig. 2, in an embodiment of the present invention, optionally, the storage subunit 214 is electrically connected to the frequency measurement subunit 207, and the storage subunit 214 is further configured to store the frequency calibration parameter and transmit the frequency calibration parameter to the frequency measurement subunit 207. The frequency measurement subunit 207 is further configured to calculate a calibrated frequency measurement result according to the frequency calibration parameter, the measurement frequency, and the reference frequency. Illustratively, the frequency calibration is performed on the differential pressure sensor before the differential pressure sensor is shipped from the factory, and the frequency calibration parameters are written into the storage subunit 214. The frequency measurement sub-unit 207 is arranged to output the calibrated frequency measurement result, and the measurement precision of the differential pressure sensor is improved. Specifically, the judgment result output by the digital processing unit 210 is judged by using the calibrated frequency measurement result, so that the accuracy of the judgment result is improved. The output port unit 211 not only receives the determination result, but also receives the calibrated frequency measurement result output by the digital processing unit 210, thereby improving the accuracy of the interrupt signal and the frequency signal output by the output port unit 211.
In one embodiment of the present invention, optionally, the capacitance-frequency conversion unit 209 comprises an RC oscillator, an LC oscillator, or a multivibrator. Since the output frequencies of the RC oscillator, the LC oscillator, and the multivibrator are all related to capacitance, the embodiment of the present invention is configured to facilitate the change of the capacitance value of the capacitive pressure sensing unit to change the change of the capacitance-frequency conversion unit 209, and at this time, the capacitive pressure sensing unit is equivalent to a part of the RC oscillator, the LC oscillator, or the multivibrator.
Optionally, the embodiment of the present invention may further perform frequency calibration on the capacitance-frequency conversion unit 209, and exemplarily, the capacitance-frequency conversion unit 209 further includes a calibration capacitor, where the calibration capacitor is used to access the circuit during the frequency calibration. For example, before shipping, the capacitance-frequency conversion unit 209 is frequency-calibrated, and a corresponding number of calibration capacitors are connected to the circuit according to the calibration result, thereby implementing frequency calibration of the capacitance-frequency conversion unit 209.
The circuit configuration of the reference frequency unit 208 is similar to that of the capacitance-frequency conversion unit 209, and the reference frequency unit 208 includes an RC oscillator, an LC oscillator, or a multivibrator. Unlike the capacitance-frequency conversion unit 209, in the reference frequency unit 208, each capacitance is less susceptible to the influence of the environment, and therefore, the reference frequency unit 208 can generate a stable reference frequency.
It should be noted that fig. 2 exemplarily shows that the output port unit 211 accesses the measurement frequency through the digital processing unit 210, and does not limit the present invention. In other embodiments, the output port unit 211 may be directly connected to the capacitance-frequency conversion unit 209.
Fig. 3 is a schematic circuit diagram of another differential pressure sensor according to an embodiment of the present invention. Referring to fig. 3, in an embodiment of the present invention, optionally, the output port unit 211 is directly connected to the capacitance-frequency conversion unit 209. In this way, the output port unit 211 does not need to access the measurement frequency through the digital processing unit 210. The specific connection mode of the output port unit 211 may be set as needed.
On the basis of the foregoing embodiments, optionally, the output port unit 211 includes: a first buffer and a second buffer. The first buffer is used for buffering and outputting the judgment result to generate an interrupt signal; the second buffer is used for buffering and outputting according to the measuring frequency and the judgment result to generate a frequency signal. By means of the method, the driving capability of the signal can be improved. Illustratively, the first buffer and the second buffer include driving transistors with stronger driving capability, so as to achieve the function of improving the signal driving capability.
Next, signals of the differential pressure sensor according to the embodiment of the present invention are explained with reference to fig. 2 and fig. 3, where an upper plate of the capacitive pressure sensing element 106 is defined as a node (i), an output end of the capacitance-frequency conversion unit 209 is defined as a node (ii), a port 205 of the output port unit 211 is defined as a node (iii), and a port 206 of the output port unit 211 is defined as a node (iv).
Fig. 4 is a signal waveform diagram of a differential pressure sensor according to an embodiment of the present invention. The signal waveform diagram and all the signal waveform diagrams shown in the embodiments of the present invention may be the signal waveform diagram of any one of the differential pressure sensors shown in fig. 2 or fig. 3. Referring to fig. 4, waveform 301 represents, for example, a waveform of variation of node (r), and may also represent a waveform of variation of pressure/flow; the waveform 305 represents the waveform of the node II, and can also represent the variation waveform of the measurement frequency, and the frequency has the trend of linear variation along with the pressure difference; waveform 302 represents the waveform of the threshold setting parameter, and waveform 302 is constant; the waveform 303 represents a waveform of the node (c), and may also represent a waveform of an interrupt signal, and whether the level exceeds a threshold value is represented by a high level or a low level; the waveform 304 represents the waveform of the node (r), and may represent the waveform of a frequency signal, and the frequency of the signal may be represented by the frequency of a square wave. Taking an electronic cigarette sensor as an example, when the pressure/flow (waveform 301) exceeds a threshold setting parameter (waveform 302), smoking behavior is represented, and an interrupt signal (waveform 303) changes from low level to high level; when the pressure/flow (waveform 301) does not exceed the threshold, indicating no smoking activity, the interrupt signal (waveform 303) reverts to the initial low state (default output state). In this process, the square wave frequency in the frequency signal (waveform 304) changes with the change of the pressure/flow, and when the pressure/flow becomes larger, the square wave frequency in the frequency signal (waveform 304) becomes larger; as the pressure/flow becomes smaller, the square wave frequency in the frequency signal (waveform 304) becomes smaller.
In addition to the above embodiments, there are various output forms of the interrupt signal (i.e., the determination result) and the frequency signal, and some of them will be described below, but the present invention is not limited thereto.
With continued reference to fig. 4, in one embodiment of the present invention, the frequency measurement result (waveform 301) is set to be less than the threshold setting parameter (waveform 302), and the determination result (waveform 303) is low; the frequency measurement result (waveform 301) is greater than the threshold setting parameter (waveform 302), and the determination result (waveform 303) is at a high level.
Fig. 5 is a signal waveform diagram of another differential pressure sensor according to an embodiment of the present invention. Referring to fig. 5, in one embodiment of the present invention, alternatively, the frequency measurement result (waveform 301) is set to be less than the threshold setting parameter (waveform 302), and the determination result is high level (waveform 303); the frequency measurement result (waveform 301) is greater than the threshold setting parameter (waveform 302), and the determination result is low (waveform 303).
With continued reference to fig. 4 and 5, in one embodiment of the present invention, optionally, the greater the frequency of the set measurement frequency (waveform 301), the greater the square wave frequency of the frequency signal (waveform 304).
Fig. 6 is a signal waveform diagram of another differential pressure sensor according to an embodiment of the present invention. Referring to fig. 6, in one embodiment of the present invention, optionally, the greater the frequency of the set measurement frequency (waveform 301), the smaller the square wave frequency of the frequency signal (waveform 304).
With continued reference to fig. 4 to 6, in an embodiment of the present invention, optionally, the output port unit 211 outputs a frequency signal (square wave) when the frequency measurement result is less than, equal to, or greater than the threshold setting parameter.
Fig. 7 is a signal waveform diagram of another differential pressure sensor provided in the embodiment of the present invention, and fig. 8 is a signal waveform diagram of another differential pressure sensor provided in the embodiment of the present invention. Referring to fig. 7 and 8, in an embodiment of the present invention, optionally, if the frequency measurement result (waveform 301) is greater than the threshold setting parameter (waveform 302), the output port unit 211 outputs a frequency signal (square wave); if the frequency measurement result (waveform 301) is smaller than the threshold setting parameter (waveform 302), the output port unit 211 outputs a constant level signal.
In the above embodiments, the frequency measurement result is equal to the threshold setting parameter, but in practical applications, the frequency measurement result may be set to be equal to the threshold setting parameter according to needs.
In summary, the differential pressure sensor according to the embodiment of the present invention includes the capacitive pressure sensing element 106 and the processing module 105, wherein the capacitance of the capacitive pressure sensing element 106 is positively correlated with the differential pressure, and the processing module 105 is configured to output the interrupt signal and the frequency signal according to the capacitance. Wherein the interrupt signal is indicative of whether the pressure differential exceeds a threshold and the frequency signal is indicative of the magnitude of the pressure differential. Therefore, the embodiment of the invention not only can output the trigger signal, but also can detect the pressure in real time, thereby being beneficial to improving the user experience. In addition, on one hand, in the electronic equipment, the differential pressure can be measured only by arranging one differential pressure sensor provided by the embodiment of the invention, so that the cost is reduced, and the structure of the electronic equipment is simplified; on the other hand, in the electronic device, the differential pressure sensor provided by the embodiment of the invention can not only output the interrupt signal, but also collect and output the frequency signal representing the magnitude of the differential pressure in real time, so that a main control chip is not required to collect the pressure signal in real time. And compared with the main control chip, the power consumption of the differential pressure sensor is lower, so that the power consumption of the whole electronic equipment is reduced. In summary, on the basis of reducing cost and power consumption, the system controls the atomization power and the smoke amount of the electronic cigarette atomizer according to the smoking strength, so as to bring finer smoking experience to the client.
The embodiment of the invention also provides an electronic cigarette, which comprises the differential pressure sensor provided by any embodiment of the invention, wherein the differential pressure sensor is arranged on the electronic cigarette. The technical principle and the effect of the electronic cigarette provided by the embodiment of the invention are similar to those of the differential pressure sensor, and are not repeated here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A differential pressure sensor, comprising:
a capacitive pressure sensing element located between a first pressure environment and a second pressure environment; the capacitance type pressure sensing element is used for sensing the pressure difference between the first pressure environment and the second pressure environment, and the capacitance value of the capacitance type pressure sensing element is positively correlated with the pressure difference;
the processing module is electrically connected with the capacitive pressure sensing element and is used for outputting an interrupt signal and a frequency signal according to the capacitance value;
the processing module comprises a capacitance-frequency conversion unit, a reference frequency unit, a digital processing unit and an output port unit; the capacitance-frequency conversion unit is electrically connected with the capacitance type pressure sensing element and is used for converting the capacitance value into a measurement frequency; the reference frequency unit is used for outputting a reference frequency; the digital processing unit is electrically connected with the capacitance-frequency conversion unit and the reference frequency unit and is used for outputting a judgment result according to the measurement frequency, the reference frequency and a built-in threshold setting parameter; and the output port unit is electrically connected with the digital processing unit and is used for outputting the interrupt signal and the frequency signal according to the judgment result and the measurement frequency.
2. The differential pressure sensor of claim 1, wherein the digital processing unit comprises:
the frequency measurement subunit is electrically connected with the capacitance-frequency conversion unit and the reference frequency unit and is used for calculating according to the measurement frequency and the reference frequency to obtain a frequency measurement result;
and the logic judgment subunit is used for obtaining the judgment result according to the frequency measurement result and the threshold setting parameter.
3. The differential pressure sensor of claim 2, wherein the digital processing unit further comprises: and the storage subunit is electrically connected with the logic judgment subunit and is used for storing the threshold setting parameter and transmitting the threshold setting parameter to the logic judgment subunit.
4. The differential pressure sensor of claim 3, wherein the storage sub-unit is electrically connected to the frequency measurement sub-unit, the storage sub-unit further configured to store a frequency calibration parameter and transmit the frequency calibration parameter to the frequency measurement sub-unit;
and the frequency measurement sub-unit is also used for calculating according to the frequency calibration parameter, the measurement frequency and the reference frequency to obtain a calibrated frequency measurement result.
5. The differential pressure sensor according to claim 2, wherein the determination result is a high level or a low level;
setting the frequency measurement result to be smaller than the threshold setting parameter, wherein the judgment result is a low level; the frequency measurement result is greater than the threshold setting parameter, and the judgment result is a high level;
or setting the frequency measurement result to be smaller than the threshold setting parameter, wherein the judgment result is a high level; the frequency measurement result is greater than the threshold setting parameter, and the judgment result is a low level.
6. The differential pressure sensor of claim 2, wherein the frequency signal is a square wave;
if the frequency measurement result is greater than the threshold setting parameter, the output port unit outputs the frequency signal; if the frequency measurement result is smaller than the threshold setting parameter, the output port unit outputs a constant level signal;
or, the output port unit outputs the frequency signal when the frequency measurement result is less than, equal to, or greater than the threshold setting parameter.
7. The differential pressure sensor of claim 1, wherein the frequency signal is a square wave;
setting the frequency of the measuring frequency to be larger, and the square wave frequency of the frequency signal to be larger;
alternatively, the greater the frequency at which the measurement frequency is set, the smaller the square wave frequency of the frequency signal.
8. The differential pressure sensor according to claim 1, wherein the capacitance-frequency conversion unit comprises an RC oscillator, an LC oscillator, or a multivibrator;
the reference frequency unit includes an RC oscillator, an LC oscillator, or a multivibrator.
9. The differential pressure sensor of claim 8, wherein the capacitance-to-frequency conversion unit further comprises a calibration capacitance for accessing a circuit during frequency calibration.
10. The differential pressure sensor according to claim 1, wherein the output port unit includes:
the first buffer is used for buffering and outputting the judgment result to generate the interrupt signal;
a second buffer for buffering the measurement frequency to output, and generating the frequency signal.
11. The differential pressure sensor of any one of claims 1-10, wherein the processing module comprises an application specific integrated circuit chip;
the capacitive pressure sensing element comprises a micro-electromechanical system sensor.
12. The differential pressure sensor as claimed in any one of claims 1 to 10, further comprising:
the device comprises a substrate and a shell fixedly connected with the substrate; the substrate comprises a first air hole which is communicated with a first pressure environment; the shell comprises a second air hole which is communicated with a second pressure environment; the capacitive pressure sensing element covers the first air hole; the processing module is arranged on the substrate.
13. An electronic cigarette, comprising: the differential pressure sensor of any of claims 1-12, disposed on the electronic cigarette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410901.XA CN112515245A (en) | 2020-12-04 | 2020-12-04 | Pressure difference sensor and electronic cigarette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410901.XA CN112515245A (en) | 2020-12-04 | 2020-12-04 | Pressure difference sensor and electronic cigarette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112515245A true CN112515245A (en) | 2021-03-19 |
Family
ID=74997718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011410901.XA Pending CN112515245A (en) | 2020-12-04 | 2020-12-04 | Pressure difference sensor and electronic cigarette |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112515245A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113729310A (en) * | 2021-09-15 | 2021-12-03 | 苏州敏芯微电子技术股份有限公司 | Control method of electronic cigarette, electronic cigarette sensing chip and electronic cigarette |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102793276A (en) * | 2012-08-03 | 2012-11-28 | 胡朝群 | Electronic cigarette chip and electronic cigarette |
| CN109283867A (en) * | 2018-08-24 | 2019-01-29 | 深圳市合元科技有限公司 | A kind of ON-OFF control circuit, method of controlling switch and electronic cigarette |
| CN209728476U (en) * | 2019-05-22 | 2019-12-03 | 歌尔科技有限公司 | Electronic cigarette switch |
| CN209965231U (en) * | 2018-09-19 | 2020-01-21 | 歌尔科技有限公司 | Atomizer and electronic cigarette |
| CN111588094A (en) * | 2020-05-30 | 2020-08-28 | 杭州尚格半导体有限公司 | Electronic atomization device and control circuit and control method thereof |
-
2020
- 2020-12-04 CN CN202011410901.XA patent/CN112515245A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102793276A (en) * | 2012-08-03 | 2012-11-28 | 胡朝群 | Electronic cigarette chip and electronic cigarette |
| CN109283867A (en) * | 2018-08-24 | 2019-01-29 | 深圳市合元科技有限公司 | A kind of ON-OFF control circuit, method of controlling switch and electronic cigarette |
| CN209965231U (en) * | 2018-09-19 | 2020-01-21 | 歌尔科技有限公司 | Atomizer and electronic cigarette |
| CN209728476U (en) * | 2019-05-22 | 2019-12-03 | 歌尔科技有限公司 | Electronic cigarette switch |
| CN111588094A (en) * | 2020-05-30 | 2020-08-28 | 杭州尚格半导体有限公司 | Electronic atomization device and control circuit and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113729310A (en) * | 2021-09-15 | 2021-12-03 | 苏州敏芯微电子技术股份有限公司 | Control method of electronic cigarette, electronic cigarette sensing chip and electronic cigarette |
| WO2023040950A1 (en) * | 2021-09-15 | 2023-03-23 | 苏州敏芯微电子技术股份有限公司 | Electronic cigarette control method, electronic cigarette sensing chip and electronic cigarette |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5778619B2 (en) | Pressure sensor | |
| US9967677B2 (en) | System and method for sensor-supported microphone | |
| WO2017012333A1 (en) | Mobile device and control method therefor | |
| US10177569B2 (en) | System and method for power supply ripple compensation | |
| CN112515245A (en) | Pressure difference sensor and electronic cigarette | |
| EP1426772A1 (en) | Impedance measuring circuit, its method, and capacitance measuring circuit | |
| Vigna | Tri-axial MEMS gyroscopes and six degree-of-freedom motion sensors | |
| EP1424563A1 (en) | Capacitance measuring circuit, capacitance measuring instrument, and microphone device | |
| EP0494926B1 (en) | Capacitive pressure transducer system | |
| EP1426771A1 (en) | Impedance measuring circuit and capacitance measuring circuit | |
| WO2003023417A1 (en) | Sensor capacity sensing apparatus and sensor capacity sensing method | |
| JP2002022786A (en) | Impedance detecting circuit and impedance detecting method | |
| JP2005535900A (en) | Pressure measuring device with capacitive pressure sensor in amplifier feedback path | |
| CN215224763U (en) | Pressure difference sensor and electronic cigarette | |
| CN113729310A (en) | Control method of electronic cigarette, electronic cigarette sensing chip and electronic cigarette | |
| US11693020B2 (en) | Accelerometer having a root-mean-square (RMS) output | |
| US20020084789A1 (en) | Method for sensing humidity in a tape library | |
| Ramanathan et al. | Low value capacitance measurements for capacitive sensors-a review | |
| TWI759683B (en) | Moisture sensing module | |
| JP5150148B2 (en) | Capacitance detection circuit | |
| CN113311030B (en) | Moisture sensing module | |
| CN211824551U (en) | Integrated sensor and wearable device | |
| Al-Hamry et al. | Low-cost portable system for capacitance measurement based on active bridge and relaxation oscillator | |
| US20230194375A1 (en) | Sensor device | |
| JP5496515B2 (en) | Acceleration sensor circuit and three-axis acceleration sensor circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |