CN113693302A - Electronic cigarette control method, electronic cigarette control device and electronic cigarette - Google Patents
Electronic cigarette control method, electronic cigarette control device and electronic cigarette Download PDFInfo
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- CN113693302A CN113693302A CN202111000384.3A CN202111000384A CN113693302A CN 113693302 A CN113693302 A CN 113693302A CN 202111000384 A CN202111000384 A CN 202111000384A CN 113693302 A CN113693302 A CN 113693302A
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- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 298
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 24
- 230000003434 inspiratory effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 abstract description 19
- 230000008859 change Effects 0.000 abstract description 7
- 235000019504 cigarettes Nutrition 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- A24F40/53—Monitoring, e.g. fault detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
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Abstract
The invention discloses an electronic cigarette control method, an electronic cigarette control device and an electronic cigarette, wherein the electronic cigarette control method comprises the following steps: determining a first voltage detection value; determining a second voltage detection value; calculating a difference value between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device; and when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to perform heating and atomizing work. According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without an interference current value is obtained. The interference of interference current to the inhalation airflow detection signal is eliminated, the problem that the control device determines the inhalation airflow detection signal to be invalid due to instantaneous change of current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
Description
Technical Field
The invention relates to the field of electronic cigarettes, in particular to a control method of an electronic cigarette, a control device of the electronic cigarette and the electronic cigarette.
Background
When the electronic cigarette works, the internal temperature is 220 ℃ to 300 ℃, and at this time, the reverse saturation current (reverse saturation current) or leakage current (leakage current) of the electrostatic protection circuit is increased by more than one thousand times, so that the instantaneous and sudden change of the interference current such as the reverse saturation current, the leakage current and the like may cause the control device to determine the inhalation airflow detection signal incorrectly, that is, the electronic cigarette may not work when a user inhales. Of course, in the using process of the electronic cigarette, the electronic cigarette may also be determined incorrectly due to other factors, such as a large interference current generated by an instantaneous excessive current.
Disclosure of Invention
The invention mainly aims to provide an electronic cigarette control method, an electronic cigarette control device and an electronic cigarette, and aims to disturb the influence of current when the electronic cigarette works and improve the stability of the electronic cigarette.
In order to achieve the above object, the present invention provides a method for controlling an electronic cigarette, where the electronic cigarette includes a capacitive airflow detection device for outputting an inhalation airflow detection signal when it is detected that the electronic cigarette is in an inhaled state, and the method for controlling the electronic cigarette includes the following steps:
when the electronic cigarette is detected to be in a sucked state, acquiring a first current value of the capacitive airflow detection device under the charging of a first charging current signal according to a first preset time length, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time length;
acquiring a second current value of the capacitive airflow detection device under the charging of a second charging current signal according to the first preset time length, and determining a second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal;
calculating a difference value between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device; and
and when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to perform heating and atomizing work.
In an embodiment, before the step of acquiring a first current value of the capacitive airflow detecting device charged by a first charging current signal according to a first preset time period when the electronic cigarette is detected to be in the inhaled state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detecting device, and the first preset time period, the control method further includes:
outputting a charging current to the capacitive airflow detection device according to a preset measurement period so as to enable the capacitive airflow detection device to be in a charging detection state; each measurement period comprises a first sub-period and a second sub-period, a first charging current signal is output to the capacitive airflow detection device in the first sub-period of each measurement period, and a second charging current signal is output to the capacitive airflow detection device in the second sub-period of each measurement period.
In an embodiment, the determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period includes:
calculating a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detection device;
and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time length to obtain a first voltage detection value.
In an embodiment, the determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period includes:
calculating a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detection device;
and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detection device by a first preset time to obtain a second voltage detection value.
The invention further provides a control device of an electronic cigarette, the electronic cigarette comprises a capacitive airflow detection device for outputting a suction airflow detection signal when the electronic cigarette is detected to be in a sucked state, and the control device of the electronic cigarette comprises:
the detection port is electrically connected with the capacitance type airflow detection device;
the control circuit is electrically connected with the detection port and used for detecting a first current value of the capacitive airflow detection device charged by a first charging current signal according to a first preset time length in a first sub-period when the electronic cigarette is detected to be in a sucked state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time length;
the control circuit is further configured to detect a second current value of the capacitive airflow detection device charged by a second charging current signal in a second sub-period according to the first preset time duration, and determine a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time duration;
the control circuit is further used for calculating a difference value between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device; and
the comparison circuit is used for outputting a trigger signal when the actual voltage detection value is greater than or equal to a reference voltage value;
the control circuit is also used for controlling the electronic cigarette to perform heating and atomizing work according to the trigger signal.
In one embodiment, the control device of the electronic cigarette further comprises:
a current source electrically connected to the detection port;
the control circuit is further used for controlling the current source to output charging current to the capacitive airflow detection device according to a preset measurement period so as to enable the capacitive airflow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, the current source is controlled to output a first charging current signal to the capacitive airflow detecting device in the first sub-period of each measuring period, and the current source is controlled to output a second charging current signal to the capacitive airflow detecting device in the second sub-period of each measuring period.
In an embodiment, the control circuit is further configured to calculate a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detection device, and multiply the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time duration to obtain a first voltage detection value.
In an embodiment, the control circuit is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detection device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time duration to obtain a second voltage detection value.
In one embodiment, the control device of the electronic cigarette further comprises:
and the electrostatic protection circuit is electrically connected with the detection port.
The invention further provides an electronic cigarette, which comprises a capacitive airflow detection device and the electronic cigarette control device, wherein the capacitive airflow detection device is used for outputting a suction airflow detection signal when the electronic cigarette is detected to be in a suction state, and a detection interface of the electronic cigarette control device is electrically connected with the capacitive airflow detection device.
In one embodiment, the capacitive airflow detecting device is a capacitive microphone.
According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without an interference current value is obtained. The interference of interference current to the inhalation airflow detection signal is eliminated, the problem that the control device determines the inhalation airflow detection signal to be invalid due to instantaneous change of current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating steps of a control method of an electronic cigarette according to an embodiment of the present invention;
figure 2 is a schematic flow chart illustrating steps of a method for controlling an electronic cigarette according to an embodiment of the present invention;
figure 3 is a schematic flow chart illustrating steps of a method for controlling an electronic cigarette according to an embodiment of the present invention;
figure 4 is a schematic structural view of a control device of an electronic cigarette according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of an electronic cigarette according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a method for controlling an electronic cigarette, where the electronic cigarette includes a capacitive airflow detection device for outputting an inhalation airflow detection signal when it is detected that the electronic cigarette is in an inhaled state.
Taking the leakage current of the electrostatic protection circuit as an example, when a user uses the electronic cigarette, the user can contact with the electronic cigarette main body to generate electrostatic Discharge (ESD-Electro-Static Discharge), the ESD generated by a human body is a high voltage of thousands of volts, and the high voltage pulse can invade into the internal circuit of the electronic cigarette to damage the internal circuit, so as to cause misoperation of the internal circuit, and the damage is destructive and permanent. In order to prevent ESD from entering the electronic cigarette, an electrostatic discharge (ESD) protection circuit is designed for an input/output (I/O) pin of the internal circuit.
The working principle of the electronic cigarette is as follows: when a user inhales, the capacitive airflow detection device responds to output an air-breathing airflow detection signal to the control device, and the control device drives the heating wire and the atomizer to start working to generate smoke. When a user stops inhaling, the capacitive airflow detection device does not output a signal, the control device stops working, and the heating wire and the atomizer stop working. The working temperature of the heating wire is usually 220-300 ℃, and the rising temperature value in the electronic cigarette can instantly exceed 100 ℃ when the heating wire works. The calculation formula of the leakage current of the electrostatic protection circuit is
Where T1 is the original temperature and T2 is the increased temperature. When the heating wire works, the static protection circuit is influenced by high temperature, and the leakage current of the static protection circuit is suddenly increased by more than 1000 times. For example, if the temperature inside the electronic cigarette instantaneously rises from 25 ℃ to 125 ℃, the leakage current instantaneously explodes 1024 times. This instantaneous change in current will detect the inspiratory flow received by the control deviceThe signal interferes, which causes the control device to judge the air suction flow detection signal incorrectly, i.e. the air suction action of the user may fail and no smoke is generated.
To solve the problem that the current transient variation causes the misalignment of the electronic cigarette determination, referring to fig. 1, in an embodiment of the present invention, a method for controlling an electronic cigarette includes the following steps:
step S100: when the electronic cigarette is detected to be in a sucked state, a first current value of the capacitive airflow detection device under the charging of a first charging current signal is obtained according to a first preset time period, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time period.
Step S200: acquiring a second current value of the capacitive airflow detection device under the charging of a second charging current signal according to a first preset time length, and determining a second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal.
Step S300: and performing difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device.
Step S400: and when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to perform heating and atomizing work.
In this embodiment, the first charging current signal and the second charging current signal may be provided by two current sources, respectively, or may be provided by a control chip with a current source outputting currents of different magnitudes in a time-sharing manner, or may be provided by a current adjusting circuit receiving a power supply signal to adjust the magnitude of the current. In one embodiment, the electronic cigarette further comprises control means for outputting a charging current to the capacitive airflow detecting means, performing a difference calculation on the first voltage detection value and the second voltage detection value, and comparing the actual voltage detection value with the reference voltage value.
The control device outputs a first charging current signal and a second charging current signal to the capacitive airflow detection device in a wheel flow direction, and charges the capacitive airflow detection device. When a user inhales, airflow changes can be generated to cause voltage changes at two ends of the capacitive airflow detection device, and the voltage values changed at the two ends of the capacitive airflow detection device are actual voltage detection values output to the control device by the capacitive airflow detection device.
In order to calculate the voltage value of the capacitance type airflow detection device, a first voltage detection value of the capacitance type airflow detection device under the charging of a first charging current signal is firstly calculated, and the calculation formula is a first preset formula:
wherein T is a first preset duration, I1-I0Is a first current value, I1Is a first charging current value, I0C is the equivalent capacitance of the capacitive airflow detecting device.
And then calculating a second voltage detection value of the capacitive airflow detection device under the charging of a second charging current signal, wherein the calculation formula is a second preset formula:
wherein T is a first preset duration, I2-I0Is a second current value, I2Is a first charging current value, I0C is the equivalent capacitance of the capacitive airflow detecting device.
And calculating the difference value of the first voltage detection value and the second voltage detection value to obtain the voltage value of the capacitance type airflow detection device, wherein the voltage value of the capacitance type airflow detection device is changed by the following steps:
namely, the actual voltage detection value output to the control device by the capacitance type airflow detection device is
And calculating a difference value to eliminate the interference current value in the first voltage detection value and the second voltage detection value, wherein the obtained actual voltage detection value does not contain an interference current component. Thus, it is possible to provideThe interference of the interference current to the suction airflow detection signal can be eliminated.
The control device compares the actual voltage detection value with the reference voltage value, and when the actual voltage detection value is larger than or equal to the reference voltage value, the electronic cigarette is triggered to perform heating and atomizing work.
The first charging current signal and the second charging current signal are both constant current signals. And in the period of outputting the first charging current signal and the second charging current signal, the first preset time length is taken. Since the first preset time period is small in practical applications, usually in milliseconds, the first current value within the first preset time period can be considered to be constant. Similarly, the second current value within the first preset time period may also be considered to be constant. And respectively acquiring a first preset time length under the first charging current signal and the second charging current signal, and respectively acquiring a first current value and a second current value within the first preset time length so as to calculate the difference value.
According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without interference current components is obtained, and the actual voltage detection value output to the control device by the capacitive airflow detection device is calculated. So can eliminate the interference of interference current to inspiratory flow detected signal, solve the problem that the electron cigarette during operation electric current transient variation causes controlling means to judge inefficacy to inspiratory flow detected signal, improve the stability of electron cigarette.
Referring to fig. 2, in an embodiment, before the step of acquiring a first current value of the capacitive airflow detecting device charged by the first charging current signal according to a first preset time period when the electronic cigarette is detected to be in the inhaled state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detecting device, and the first preset time period, the control method further includes:
outputting a charging current to the capacitive airflow detection device according to a preset measurement period so as to enable the capacitive airflow detection device to be in a charging detection state; each measurement period comprises a first sub-period and a second sub-period, a first charging current signal is output to the capacitive airflow detection device in the first sub-period of each measurement period, and a second charging current signal is output to the capacitive airflow detection device in the second sub-period of each measurement period.
In this embodiment, the durations of the first sub-period and the second sub-period may be the same or different, and are not limited herein. The control device outputs a charging current signal to the capacitive airflow detection device according to a preset measurement period so as to charge the capacitive airflow detection device. When a user inhales, airflow changes can be generated to cause voltage changes at two ends of the capacitive airflow detection device, and the voltage values changed at the two ends of the capacitive airflow detection device are actual voltage detection values output to the control device by the capacitive airflow detection device.
In the embodiment, the preset measurement period is divided into a first sub-period and a second sub-period, and the capacitive airflow detection device is charged by different charging current signals in different sub-periods to generate different first current values and second current values, so that the difference between the first voltage detection value and the second voltage detection value can be calculated, and the interference current is eliminated.
Referring to fig. 3, in an embodiment, determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period includes:
s110: a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detecting device is calculated.
S120: and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time length to obtain a first voltage detection value.
From the conservation of energy, the electric quantity Q ═ C ═ V ═ I ═ T, i.e.
Therefore, the formula for calculating the first voltage detection value is a first preset formula:
wherein T is a first preset duration, I1-I0Is a first current value, I1Is a first charging current value, I0C is the equivalent capacitance of the capacitive airflow detecting device.
The invention creatively applies an electric quantity formula, and a calculation formula of a first voltage detection value is obtained by deriving Q ═ C ═ V ═ I ═ T
And the first voltage detection value is converted into a first preset time length, a first current value and an equivalent capacitance value of the capacitive airflow detection device for expression, so that difference value calculation is facilitated.
Referring to fig. 4, in an embodiment, determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period includes:
s210: a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detecting device is calculated.
S220: and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time length to obtain a second voltage detection value.
From the conservation of energy, the electric quantity Q ═ C ═ V ═ I ═ T, i.e.
Therefore, the formula for calculating the first voltage detection value is a second preset formula:
wherein T is a first preset duration, I2-I0Is a second current value, I2Is a first charging current value, I0C is the equivalent capacitance of the capacitive airflow detecting device.
The invention creatively applies an electric quantity formula, and a calculation formula of a first voltage detection value is obtained by deriving Q ═ C ═ V ═ I ═ T
And converting the second voltage detection value into a first preset time length, a second current value and an equivalent capacitance value of the capacitive airflow detection device for expression, so that difference value calculation is facilitated.
In this embodiment, a formula of the first voltage detection value and the formula of the second voltage detection value are derived through an electric quantity formula, so as to calculate a difference between the first voltage detection value and the second voltage detection value, eliminate an interference current value, and obtain an actual voltage detection value output to the control device by the capacitive airflow detection device. Therefore, the actual voltage detection value in any measurement period is irrelevant to the interference current, the interference of the interference current on the inhalation airflow detection signal is eliminated, the problem that the judgment of the control device on the inhalation airflow detection signal is invalid due to the instantaneous change of the current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
The principles of the present invention will now be explained with reference to the accompanying drawings in which:
and outputting a first charging current signal to the capacitive airflow detection device in a first sub-period of each measurement period, and outputting a second charging current signal to the capacitive airflow detection device in a second sub-period of each measurement period. When the electronic cigarette is detected to be in a sucked state, a first current value and a second current value of the capacitive airflow detection device under the charging of a first charging current signal and a second charging current signal are respectively obtained according to a first preset time length, the first current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length are substituted into a first preset formula to determine a first voltage detection value, and the second current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length are substituted into a second preset formula to determine a second voltage detection value. And calculating the difference value of the first voltage detection value and the second voltage detection value to obtain the actual voltage detection value output by the capacitive airflow detection device. And when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to perform heating and atomizing work.
According to the invention, the preset measurement period is divided into the first sub-period and the second sub-period, the capacitive airflow detection device is charged through different charging current signals in different sub-periods, and different first current values and second current values are obtained, so that the difference value calculation can be carried out on the first voltage detection value and the second voltage detection value, and an actual voltage detection value formula without interference current is obtained. So can eliminate the interference of interference current to inspiratory flow detected signal, solve the problem that the electron cigarette during operation electric current transient variation causes controlling means to judge inefficacy to inspiratory flow detected signal, improve the stability of electron cigarette.
Referring to fig. 4 and 5, the present invention further provides a control device for an electronic cigarette, where the electronic cigarette includes a capacitive airflow detecting device for outputting a suction airflow detecting signal when it is detected that the electronic cigarette is in a sucked state, and the control device for the electronic cigarette includes:
the detection port 100 is electrically connected to the capacitive airflow detection device.
The control circuit 200 is electrically connected to the detection port 100, and configured to detect a first current value of the capacitive airflow detection device charged by the first charging current signal according to a first preset time duration in a first sub-period when the electronic cigarette is detected to be in a state of being inhaled, and determine a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device, and the first preset time duration.
The control circuit 200 is further configured to detect a second current value of the capacitive airflow detecting device charged by the second charging current signal according to a first preset time duration in the second sub-period, and determine a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive airflow detecting device, and the first preset time duration.
The control circuit 200 is further configured to perform a difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device.
And a comparison circuit 300 for outputting a trigger signal when the actual voltage detection value is greater than or equal to the reference voltage value.
The control circuit 200 is further configured to control the electronic cigarette to perform heating and atomizing operations according to the trigger signal.
In the above embodiment, the comparator circuit 300 may be a comparator.
When a user inhales, the control circuit 200 detects a first current value of the capacitive airflow detection device charged by a first charging current signal through the detection port 100 in a first sub-period according to a first preset time length, so as to obtain a first voltage detection value; and detecting a second current value of the capacitive airflow detection device charged by the second charging current signal according to a first preset time length in a second sub-period, so as to obtain a second voltage detection value. The control circuit 200 performs a difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device, and outputs the actual voltage detection value to a first input terminal of the comparison circuit 300. The comparison circuit 300 compares the actual voltage detection value with a preset reference voltage value, and outputs a trigger signal to the control circuit 200 when the actual voltage detection value is greater than or equal to the reference voltage value. The control circuit 200 drives the electronic cigarette to perform heating and atomizing operations.
In practical application, the reference voltage value can be set according to requirements. For example, when the comparison circuit 300 is required to protect the subsequent circuit, a larger reference voltage value may be set to prevent a large current from damaging the subsequent circuit; when the comparison circuit 300 is required to output the trigger signal, a smaller voltage value may be set, and the trigger signal may be output when the actual voltage detection value reaches the reference voltage value.
According to the invention, the control circuit 200 is used for obtaining an actual voltage detection value output by the capacitive airflow detection device, the actual voltage detection value is output to the first input end of the comparison circuit 300, the comparison circuit 300 is used for comparing the actual voltage detection value with a reference voltage value, and when the actual voltage detection value reaches the reference voltage value, a trigger signal is output. The interference of interference current to the inhalation airflow detection signal is eliminated, the problem that the control device determines the inhalation airflow detection signal to be invalid due to instantaneous change of current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
In an embodiment, the control device of the e-cigarette further comprises a current source 400.
The current source 400 is electrically connected to the detection port 100.
The control circuit 200 is further configured to control the current source 400 to output a charging current to the capacitive airflow detecting device according to a preset measurement period, so that the capacitive airflow detecting device is in a charging detection state; each measurement period includes a first sub-period and a second sub-period, the current source 400 is controlled to output a first charging current signal to the capacitive airflow detecting device during the first sub-period of each measurement period, and the current source 400 is controlled to output a second charging current signal to the capacitive airflow detecting device during the second sub-period of each measurement period.
In the above embodiment, the current source 400 further includes the first switch. The input terminal of the first switch is connected to both the output terminal of the current source 400 and the control circuit 200, and the output terminal of the first switch is grounded. When the time period reaches a set value, the control circuit 200 controls the switch to be grounded, the voltage output of the capacitive airflow detection device is returned to zero, and the voltage output is accumulated again.
In the present embodiment, the current source 400 generates a variable current, and outputs a first charging current signal in a first sub-period and a second charging current signal in a second sub-period to generate a first current value and a second current value, which are different from each other, and only an interference current value is eliminated when performing a difference operation on the first voltage detection value and the second voltage detection value. Therefore, the interference of interference current on the inhalation airflow detection signal is eliminated, and the stability of the electronic cigarette is improved.
In an embodiment, the control circuit 200 is further configured to calculate a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detecting device with a first preset time duration to obtain a first voltage detection value.
The control circuit 200 substitutes the first current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time length into a first preset formula to obtain a first voltage detection value.
The invention creatively applies an electric quantity formula, and a calculation formula of a first voltage detection value is obtained by derivation of Q ═ C ═ V ═ I ═ TFormula (II)
And the first voltage detection value is converted into a first preset time length, a first current value and an equivalent capacitance value of the capacitive airflow detection device for expression, so that difference value calculation is facilitated.
In an embodiment, the control circuit 200 is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detecting device with a first preset time duration to obtain a second voltage detection value.
The control circuit 200 substitutes the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time length into a second preset formula to obtain a second voltage detection value.
The invention creatively applies an electric quantity formula, and a calculation formula of a first voltage detection value is obtained by deriving Q ═ C ═ V ═ I ═ T
And converting the second voltage detection value into a first preset time length, a second current value and an equivalent capacitance value of the capacitive airflow detection device for expression, so that difference value calculation is facilitated.
In one embodiment, the control device of the electronic cigarette further includes an electrostatic protection circuit 500 electrically connected to the detection port 100.
The electrostatic protection circuit 500 is used to prevent static electricity from invading into the electronic cigarette, which may damage the internal circuit and cause malfunction of the internal circuit.
The invention also provides an electronic cigarette, which comprises a capacitive airflow detection device 10 used for outputting a suction airflow detection signal when the electronic cigarette is detected to be in a suction state, and the control device 20 of the electronic cigarette, wherein a detection interface of the control device 20 of the electronic cigarette is electrically connected with the capacitive airflow detection device 10.
The detailed structure of the control device can refer to the above embodiments, and is not described herein; it can be understood that, because the control device is used in the electronic cigarette of the present invention, the embodiment of the electronic cigarette of the present invention includes all technical solutions of all embodiments of the control device, and the achieved technical effects are also completely the same, and are not described herein again.
In one embodiment, the capacitive airflow detecting device 10 is a capacitive microphone.
When a user inhales, the airflow causes voltage changes at two ends of the capacitive microphone, and when the voltage change reaches a certain value, the electronic cigarette is triggered to be heated and atomized. Compared with the traditional mechanical microphone, the capacitive microphone has the advantages of higher sensitivity, better anti-interference performance, lower manufacturing process requirement and convenience for mass production.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A control method of an electronic cigarette, wherein the electronic cigarette comprises a capacitive airflow detection device for outputting an air flow detection signal when the electronic cigarette is detected to be in an air-sucked state, and the control method of the electronic cigarette is characterized by comprising the following steps:
when the electronic cigarette is detected to be in a sucked state, acquiring a first current value of the capacitive airflow detection device under the charging of a first charging current signal according to a first preset time length, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time length;
acquiring a second current value of the capacitive airflow detection device under the charging of a second charging current signal according to the first preset time length, and determining a second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal;
calculating a difference value between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device; and
and when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to perform heating and atomizing work.
2. The method for controlling an electronic cigarette according to claim 1, wherein before the steps of obtaining a first current value of the capacitive airflow detecting device charged by the first charging current signal according to a first preset time period when the electronic cigarette is detected to be in the inhaled state, and determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detecting device and the first preset time period, the method further comprises:
outputting a charging current to the capacitive airflow detection device according to a preset measurement period so as to enable the capacitive airflow detection device to be in a charging detection state; each measurement period comprises a first sub-period and a second sub-period, a first charging current signal is output to the capacitive airflow detection device in the first sub-period of each measurement period, and a second charging current signal is output to the capacitive airflow detection device in the second sub-period of each measurement period.
3. The method for controlling the electronic cigarette according to claim 1, wherein the determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period comprises:
calculating a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detection device;
and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time length to obtain a first voltage detection value.
4. The method for controlling the electronic cigarette according to claim 1 or 3, wherein the determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period comprises:
calculating a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detection device;
and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detection device by a first preset time to obtain a second voltage detection value.
5. A control device of an electronic cigarette, wherein the electronic cigarette comprises a capacitive airflow detecting device for outputting a suction airflow detecting signal when detecting that the electronic cigarette is in a sucked state, the control device of the electronic cigarette comprises:
the detection port is electrically connected with the capacitance type airflow detection device;
the control circuit is electrically connected with the detection port and used for detecting a first current value of the capacitive airflow detection device charged by a first charging current signal according to a first preset time length in a first sub-period when the electronic cigarette is detected to be in a sucked state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset time length;
the control circuit is further used for detecting a second current value of the capacitive airflow detection device charged by a second charging current signal in a second sub-period according to the first preset time length, and determining a second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device and the first preset time length;
the control circuit is also used for calculating the difference value of the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive airflow detection device; and
the comparison circuit is used for outputting a trigger signal when the actual voltage detection value is greater than or equal to a reference voltage value;
the control circuit is also used for controlling the electronic cigarette to perform heating and atomizing work according to the trigger signal.
6. The control device of an electronic cigarette according to claim 5, further comprising:
a current source electrically connected to the detection port;
the control circuit is further used for controlling the current source to output charging current to the capacitive airflow detection device according to a preset measurement period so as to enable the capacitive airflow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, the current source is controlled to output a first charging current signal to the capacitive airflow detecting device in the first sub-period of each measuring period, and the current source is controlled to output a second charging current signal to the capacitive airflow detecting device in the second sub-period of each measuring period.
7. The electronic cigarette control device according to claim 6, wherein the control circuit is further configured to calculate a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detecting device by a first preset time period to obtain a first voltage detection value.
8. The electronic cigarette control device according to claim 6 or 7, wherein the control circuit is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detecting device with a first preset time period to obtain a second voltage detection value.
9. The control device of an electronic cigarette according to claim 5, further comprising:
and the electrostatic protection circuit is electrically connected with the detection port.
10. An electronic cigarette, characterized by comprising a capacitive airflow detection device for outputting a detection signal of a inspiratory airflow when the electronic cigarette is detected to be in an inspiratory state, and a control device of the electronic cigarette according to any one of claims 5 to 9, wherein a detection interface of the control device of the electronic cigarette is electrically connected with the capacitive airflow detection device.
11. The method for controlling an electronic cigarette according to claim 10, wherein the capacitive airflow detecting device is a capacitive microphone.
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