CN215224763U - Pressure difference sensor and electronic cigarette - Google Patents

Abstract

The embodiment of the utility model discloses differential pressure sensor and electron cigarette. The differential pressure sensor includes: the pressure sensing element senses pressure change to generate a first analog output voltage with variable size; the data processing module comprises: the analog-to-digital conversion module is electrically connected with the pressure sensing element and converts the first analog output voltage into a first digital voltage; the digital signal processing module is electrically connected with the analog-to-digital conversion module and is used for carrying out digital processing and sensitivity calibration on the first digital voltage to obtain a second digital voltage; and the digital-to-analog conversion module is electrically connected with the digital signal processing module and converts the second digital voltage into a second analog output voltage. Compared with the prior art, the embodiment of the utility model provides a data transmission mode of differential pressure sensor has been simplified.

Description

Pressure difference sensor and electronic cigarette

Technical Field

The embodiment of the utility model provides a relate to sensor technical field, especially relate to a differential pressure sensor and electron 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. The electronic cigarette does not contain harmful ingredients such as tar and suspended particles, the tobacco tar of the electronic cigarette can be flavored by adding flavoring agents with different ingredients, and a user can select the flavor of the tobacco tar according to own preference, so that the electronic cigarette is favored by people.

However, in the prior art, the voltage sensed by the differential pressure sensor is output in the form of a digital signal, and a port control unit needs to be arranged to match the transmission protocol of the digital signal, so that the data transmission manner of the differential pressure sensor is complicated.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a differential pressure sensor and electron cigarette to simplify differential pressure sensor's data transmission mode.

In order to achieve the technical purpose, the embodiment of the utility model provides a following technical scheme:

a differential pressure sensor, comprising:

the pressure sensing element senses pressure change to generate a first analog output voltage with variable magnitude;

a data processor, the data processor comprising:

the analog-to-digital conversion module is electrically connected with the pressure sensing element and converts the first analog output voltage into a first digital voltage;

the digital signal processing module is electrically connected with the analog-to-digital conversion module and is used for carrying out digital processing and sensitivity calibration on the first digital voltage to obtain a second digital voltage;

and the digital-to-analog conversion module is electrically connected with the digital signal processing module and converts the second digital voltage into a second analog output voltage.

Optionally, the data processor further comprises:

the gain amplification module is connected between the pressure sensing element and the digital-to-analog conversion module; and the gain amplification module performs gain amplification on the first analog output voltage and outputs the first analog output voltage.

Optionally, the gain amplifying module includes: one of a fixed gain amplification module and a programmable gain amplification module.

Optionally, the data processor further comprises:

the nonvolatile memory is electrically connected with the digital signal processing module and stores sensitivity calibration parameters.

Optionally, the non-volatile memory comprises: one of a programmable read only memory, an electrically rewritable read only memory, an erasable programmable read only memory, an electrically erasable programmable read only memory, and a flash memory.

Optionally, the analog-to-digital conversion module includes: one of a full parallel analog-to-digital conversion module, a pipeline analog-to-digital conversion module and a successive approximation analog-to-digital conversion module.

Optionally, the digital-to-analog conversion module includes: the right resistance type digital-to-analog conversion module, the T-shaped resistance type digital-to-analog conversion module, the inverted T-shaped resistance type digital-to-analog conversion module, the right current type digital-to-analog conversion module and the right capacitance type digital-to-analog conversion module.

Optionally, the pressure sensing element comprises a MEMS sensor.

Optionally, the data processor comprises an ASIC chip.

Correspondingly, the utility model also provides an electron cigarette, include: tobacco rod and miaow head, be provided with the atomizer in the miaow head and if the utility model discloses arbitrary embodiment differential pressure sensor.

The embodiment of the utility model provides a through set up analog-to-digital conversion module, digital signal processing module and digital-to-analog conversion module in data processor, not only realized the digital processing to the first analog output voltage of receiving, make final output voltage be analog voltage moreover. Compared with the prior art, the embodiment of the present invention outputs not a digital voltage but a second analog output voltage. Therefore, the embodiment of the utility model provides a need not to match digital transmission agreement, directly transmit the second analog output voltage of voltage variation to external drive control circuit through the wire through the connecting wire. Therefore, the embodiment of the utility model provides a differential pressure sensor's data transmission mode is simple, is favorable to reduce cost, and the practicality is stronger.

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 data processor according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a relationship between a second analog output voltage and a pressure sensed by the pressure sensing element according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of another data processor according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of another data processor according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a gain amplifying module according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of another gain amplifying module according to an embodiment of the present invention;

fig. 8 is a schematic circuit diagram of an analog-to-digital conversion module according to an embodiment of the present invention;

fig. 9 is a schematic circuit diagram of a digital-to-analog conversion module according to an embodiment of the present invention;

fig. 10 is a schematic structural view of an electronic cigarette 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.

An embodiment of the utility model provides a pressure differential sensor, this pressure differential sensor can be for example the electron cigarette sensor who is applied to the electron cigarette. Fig. 1 is a schematic structural diagram of a differential pressure sensor according to an embodiment of the present invention. Referring to fig. 1, the differential pressure sensor includes: a pressure sensing element 106 and a data processor 105.

The pressure sensing element 106 is located between a first pressure environment and a second pressure environment. Illustratively, on the pressure sensing element 106 is a first pressure environment, such as the environment of the electronic smoke flow channel; below the pressure sensing element 106 is a second pressure environment, such as the atmosphere outside the e-cigarette. The pressure sensing element 106 is configured to sense a pressure difference between the first pressure environment and the second pressure environment and output a first analog output voltage having a corresponding magnitude. Illustratively, the magnitude of the first analog output voltage is positively correlated with the voltage difference, i.e., the larger the voltage difference, the larger the first analog output voltage; the smaller the voltage difference, the smaller the first analog output voltage. 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 output of the pressure sensing element 106.

The pressure sensing element 106 is electrically connected to the data processor 105 via a connection 109, and the data processor 105 receives the first analog output voltage and processes it to generate a second analog output voltage. The data processor 105 is electrically connected to the external drive control circuit via a connection line 110, and outputs the second analog output voltage. The connecting wires 109 and 110 are made of the same material, and may be made of a material having a good conductivity, such as gold wire.

With continued reference to fig. 1, the differential pressure sensor optionally further comprises a substrate 101 and a housing 108 fixedly attached to the substrate 101, the data processor 105 being disposed on the substrate 101. The substrate 101 is used for supporting the housing 108 and leading out the second analog output voltage output by the data processor 105 to a main board of the electronic device, and the main board is provided with a circuit structure such as a driving control circuit. 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 pressure sensing element 106 is fixed on the substrate 101 by means of an adhesive glue 103, and the data processor 105 is fixed on the substrate 101 by means of an adhesive glue 104. 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 pressure sensing element 106 covers the first air hole 102.

Fig. 2 is a schematic circuit diagram of a data processor according to an embodiment of the present invention. Referring to fig. 2, the data processor 105 includes: an analog-to-digital conversion module 202, a digital signal processing module 203 and a digital-to-analog conversion module 204. The analog-to-digital conversion module 202 refers to a circuit module for converting an analog signal into a digital signal, for example, a full-parallel analog-to-digital conversion module, a pipeline analog-to-digital conversion module, or a successive approximation analog-to-digital conversion module. The analog-to-digital conversion module 202 is electrically connected to the pressure sensing element, receives the first analog output voltage Sa1 output by the pressure sensing element, and converts the first analog output voltage Sa1 into a first digital voltage Sd 1. The digital signal processing module 203 is a circuit module that processes signals in a digital manner, has programmability, and illustratively has a structure in which a microprocessor chip is used as a main body, and a program control chip, an interrupt chip, a clock chip, and the like are provided. The digital signal processing module 203 is electrically connected to the analog-to-digital conversion module 202, and performs digital processing and sensitivity calibration on the first digital voltage Sd1 to obtain a second digital voltage Sd 2. The digital-to-analog conversion module 204 is a circuit module for converting a digital signal into an analog signal, such as a weighted resistance digital-to-analog conversion module, a T-type resistive digital-to-analog conversion module, an inverted T-type resistive digital-to-analog conversion module, a weighted current digital-to-analog conversion module, or a weighted capacitance digital-to-analog conversion module. The digital-to-analog conversion module 204 is electrically connected to the digital signal processing module 203, and converts the second digital voltage Sd2 into a second analog output voltage Sa 2.

Illustratively, the data processor 105 operates in such a manner that the analog-to-digital conversion module 202 receives the first analog output voltage Sa1 and converts the first analog output voltage Sa1 into a first digital voltage Sd 1. The digital signal processing module 203 receives the first digital voltage Sd1, and performs digital processing and sensitivity calibration on the first digital voltage Sd1 to obtain a second digital voltage Sd 2. Illustratively, processing the first digital voltage Sd1 includes adjusting the pressure data of the actual electronic smoke flow channel in due time according to the change of the atmospheric pressure, analyzing and judging the pressure data to be output normally when an adult smokes, and outputting the pressure data to be output in a reduced pressure or non-smoking state when a child smokes, and the like. The sensitivity calibration of the first digital voltage Sd1 means that the first digital voltage Sd1 is adjusted according to the sensitivity calibration parameter, so that the output voltage is more accurate. The digital-to-analog conversion module 204 receives the second digital voltage Sd2, and converts the second digital voltage Sd2 into a second analog output voltage Sa 2. Wherein the magnitude of the second analog output voltage Sa2 corresponds to the magnitude of the pressure difference sensed by the pressure sensing element.

Fig. 3 is a schematic diagram illustrating a relationship between a second analog output voltage and a pressure sensed by the pressure sensing element according to an embodiment of the present invention. As shown in fig. 3, for example, the second analog output voltage Sa2 is linear to the pressure sensed by the pressure sensing element, and the second analog output voltage Sa2 can reflect the pressure magnitude of the differential pressure sensor in real time.

To sum up, the embodiment of the present invention provides a digital processing to the received first analog output voltage Sa1 is not only realized by setting up the analog-to-digital conversion module 202, the digital signal processing module 203 and the digital-to-analog conversion module 204 in the data processor, but also the final output voltage is analog voltage. Compared with the prior art, the embodiment of the present invention outputs not a digital voltage, but a second analog output voltage Sa 2. Therefore, the embodiment of the utility model provides a need not to match digital transmission agreement, directly transmit the second analog output voltage Sa2 of voltage size difference to outside drive control circuit through the wire through the connecting wire. Therefore, the embodiment of the utility model provides a differential pressure sensor's data transmission mode is simple, is favorable to reduce cost, and the practicality is stronger.

Fig. 4 is a schematic circuit diagram of another data processor according to an embodiment of the present invention. Referring to fig. 4, based on the above embodiments, optionally, the data processor 105 further includes a gain amplifying module 201, and the gain amplifying module 201 is connected between the pressure sensing element and the digital-to-analog conversion module 204. The gain amplification module 201 performs gain amplification on the first analog output voltage Sa1 and outputs the amplified voltage. By means of the arrangement, the first analog output voltage Sa1 can be amplified, so that the voltage converted by the analog-to-digital conversion module 202 is more accurate, and the accurate processing of the digital signal processing module 203 is facilitated, thereby improving the accuracy of pressure detection performed by the differential pressure sensor.

Fig. 5 is a schematic circuit diagram of another data processor according to an embodiment of the present invention. Referring to fig. 5, on the basis of the foregoing embodiments, optionally, the data processor 105 further includes: and the nonvolatile memory 205, wherein the nonvolatile memory 205 is electrically connected with the digital signal processing module 203, and the nonvolatile memory 205 stores the sensitivity calibration parameters. The nonvolatile memory 205 is a programmable read only memory, an electrically rewritable read only memory, an erasable programmable read only memory, an electrically erasable programmable read only memory, or a flash memory. Because the intrinsic parameters of different differential pressure sensors are different, the differential pressure sensors need to be sensitivity calibrated. For example, before the factory shipment of the differential pressure sensor, the sensitivity calibration of the differential pressure sensor is performed, and the sensitivity calibration parameters are written into the nonvolatile memory 205, so that the sensitivity calibration is performed in the subsequent application, and the accuracy of pressure detection is improved.

In the embodiments of the present invention, the gain amplifying module 201, the analog-to-digital conversion module 202, and the digital-to-analog conversion module 204 are disposed in various ways, and some of them are described below, but not limited to the present invention.

Fig. 6 is a schematic circuit diagram of a gain amplification module according to an embodiment of the present invention. Referring to fig. 6, in an embodiment of the present invention, optionally, the gain amplifying module 201 includes: a first amplifier 301 and a degeneration-resistor voltage divider 302, the degeneration-resistor voltage divider 302 being connected between the input and output of the first amplifier 301, the resistance ratio of the degeneration-resistor voltage divider 302 determining the gain of the first amplifier 301. The input signal Sa1in is the first analog output voltage before the gain, the output signal Sa1out is the first analog output voltage after the gain, and the gain of the first amplifier 301 determines the gain of the input signal Sa1in to be the gain multiple of the output signal Sa1 out.

The degeneration-resistor voltage divider 302 may have a fixed resistance ratio, that is, the gain amplification module 201 is the fixed gain amplification module 201. In other embodiments, the gain amplification module 201 may also be a programmable gain amplification module 201, i.e., the degeneration-resistor voltage divider 302 is a variable resistance ratio.

Fig. 7 is a schematic circuit diagram of another gain amplification module according to an embodiment of the present invention. Referring to fig. 7, in one embodiment of the invention, optionally, the degeneration resistive divider 302 includes a controllable switch connected in series with a resistor. The gain amplification module 201 further includes a decoder 303, and the decoder 303 controls on/off of a controllable switch in the degeneration resistor voltage divider 302 to control a resistance value of the connected resistor, thereby controlling a gain multiple of the gain amplification module 201.

Fig. 8 is a schematic circuit diagram of an analog-to-digital conversion module according to an embodiment of the present invention. Referring to fig. 8, in an embodiment of the present invention, optionally, the analog-to-digital conversion module 202 is of a successive approximation type, including: a capacitor array 401, a first switch array 402, a second comparator 403 and a control logic unit 404. The input end of the capacitor array 401 is electrically connected with the gain amplification module and is connected to a first analog output voltage Sa 1; the voltage control end at the input end of the capacitor array 401 is electrically connected with the first switch array 402, and the on-off of the first switch array 402 respectively transmits the reference voltage Vref and the grounding signal GND to the capacitor plates of the capacitor array 401; an output terminal of the capacitor array 401 is electrically connected to an input terminal of the second comparator 403, and the n-bit comparison result output by the second comparator 403 is used as the data of the first digital voltage Sd 1. The output end of the second comparator 403 is electrically connected to the control logic unit 404, and the control logic unit 404 controls the on/off of the first switch array 402 according to the comparison result. Therefore, the analog-to-digital conversion module 202 realizes the process of converting the first analog output voltage Sa1 into the first digital voltage Sd 1.

Fig. 9 is a schematic circuit diagram of a digital-to-analog conversion module according to an embodiment of the present invention. Referring to fig. 9, in an embodiment of the present invention, optionally, the digital-to-analog conversion module 204 is a weighted resistor type, including: a resistor array 501, a third comparator 502 and a second switch array 503. The voltage input end of the second switch array 503 is connected to the reference voltage Vref and the ground signal GND, and the voltage output end of the second switch array 503 is electrically connected to the input end of the resistor array 501. The output terminal of the resistor array 501 is electrically connected to the input terminal of the third comparator 502. The control terminal of the second switch array 503 is electrically connected to the digital signal processing module 203 and is connected to the second digital voltage Sd 2. One switch corresponds to one bit of data in the second digital voltage Sd2, so that the second digital voltage Sd2 controls the on/off of the second switch array 503 to switch the resistor array 501 into the corresponding voltage. The third comparator 503 outputs an analog voltage of a corresponding magnitude in a state that its input terminal is connected to different voltages, that is, outputs the second analog output voltage Sa 2.

In the above embodiments, optionally, the pressure sensing element comprises a MEMS sensor, i.e. a micro-electromechanical system sensor. The MEMS sensor is a micro-film structure processed and formed on a silicon substrate, the micro-film and a back electrode plate which is also positioned on the silicon substrate form a capacitor or a resistor, and correspondingly, the MEMS sensor is a capacitive pressure sensor or a piezoresistive pressure sensor. For example, the capacitive pressure sensor is applied in such a way that the membrane is deformed due to the change of the external pressure, but the back plate is not deformed, so that the distance between the two plates of the capacitor is changed, and the capacitance value is correspondingly changed.

In the above embodiments, optionally, the data processor comprises an ASIC chip, i.e. an application specific integrated circuit chip. Compared with a general integrated circuit, the ASIC chip has the advantages of small volume, low power consumption, high reliability, enhanced security, reduced cost and the like during batch production.

The embodiment of the utility model provides an electron cigarette is still provided. Fig. 10 is a schematic structural view of an electronic cigarette according to an embodiment of the present invention. Referring to fig. 10, the electronic cigarette includes: the tobacco rod 601 and miaow head 602 are provided with the atomizer 603 in miaow head 602 and if the utility model discloses the pressure differential sensor 604 that any embodiment provided, its technical principle is similar with the effect that produces, no longer explains repeatedly. Specifically, the differential pressure sensor 604 is disposed in the airflow channel of the microphone 602, and the differential pressure sensor 604 is electrically connected to the motherboard 605, and transmits the second analog output voltage to the driving control circuit of the motherboard 605 to control the operating state of the nebulizer 603.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. 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 with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A differential pressure sensor, comprising:

the pressure sensing element senses pressure change to generate a first analog output voltage with variable magnitude;

a data processor, the data processor comprising:

the analog-to-digital conversion module is electrically connected with the pressure sensing element and converts the first analog output voltage into a first digital voltage;

the digital signal processing module is electrically connected with the analog-to-digital conversion module and is used for carrying out digital processing and sensitivity calibration on the first digital voltage to obtain a second digital voltage;

and the digital-to-analog conversion module is electrically connected with the digital signal processing module and converts the second digital voltage into a second analog output voltage.

2. The differential pressure sensor of claim 1, wherein the data processor further comprises:

the gain amplification module is connected between the pressure sensing element and the digital-to-analog conversion module; and the gain amplification module performs gain amplification on the first analog output voltage and outputs the first analog output voltage.

3. The differential pressure sensor of claim 2, wherein the gain amplification module comprises: one of a fixed gain amplification module and a programmable gain amplification module.

4. The differential pressure sensor of claim 1, wherein the data processor further comprises:

the nonvolatile memory is electrically connected with the digital signal processing module and stores sensitivity calibration parameters.

5. The differential pressure sensor of claim 4, wherein the non-volatile memory comprises: one of a programmable read only memory, an electrically rewritable read only memory, an erasable programmable read only memory, an electrically erasable programmable read only memory, and a flash memory.

6. The differential pressure sensor of claim 1, wherein the analog-to-digital conversion module comprises: one of a full parallel analog-to-digital conversion module, a pipeline analog-to-digital conversion module and a successive approximation analog-to-digital conversion module.

7. The differential pressure sensor of claim 1, wherein the digital-to-analog conversion module comprises: the right resistance type digital-to-analog conversion module, the T-shaped resistance type digital-to-analog conversion module, the inverted T-shaped resistance type digital-to-analog conversion module, the right current type digital-to-analog conversion module and the right capacitance type digital-to-analog conversion module.

8. The differential pressure sensor of claim 1, wherein the pressure sensing element comprises a MEMS sensor.

9. The differential pressure sensor of claim 1, wherein the data processor comprises an ASIC chip.

10. An electronic cigarette, comprising: a tobacco rod and a microphone, the microphone being provided with an atomizer and a differential pressure sensor according to any one of claims 1 to 9.

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