CN107072312B

CN107072312B - Method for detecting depletion of tobacco tar in electronic cigarette and electronic cigarette

Info

Publication number: CN107072312B
Application number: CN201580000257.XA
Authority: CN
Inventors: 刘秋明; 向智勇; 韦志林; 丁建军; 牛建华
Original assignee: Kimree Technology Co Ltd
Current assignee: Kimree Technology Co Ltd
Priority date: 2015-08-10
Filing date: 2015-08-10
Publication date: 2021-07-06
Anticipated expiration: 2035-08-10
Also published as: WO2017024477A1; CN107072312A

Abstract

The utility model provides a method and an electron cigarette of tobacco tar exhaustion in detection electron cigarette, has solved among the prior art electron cigarette and can't let the user know whether tobacco tar is about to exhaust, and continue to smoke when tobacco tar is about to exhaust, and lead to the technical problem of burning cotton, the method includes the step: s1, when a smoking signal is detected, supplying power to a heating wire (2, 31, 50) for atomizing tobacco tar in the electronic cigarette so as to enable the heating wire (2, 31, 50) to work; s2, acquiring the temperature change speed of the heating wire (2, 31, 50), determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire (2, 31, 50); the electronic cigarette is controlled to stop working in time when the user uses the electronic cigarette and the tobacco tar is about to be exhausted, so that the phenomenon of burning cotton is avoided, and the use experience of the user is improved.

Description

Method for detecting depletion of tobacco tar in electronic cigarette and electronic cigarette

Technical Field

The invention relates to the technical field of electronic cigarettes, in particular to a method for detecting whether tobacco tar in an electronic cigarette is exhausted and the electronic cigarette.

Background

The electronic cigarette is a common simulated cigarette electronic product and is mainly used for quitting smoking and replacing cigarettes; the electronic cigarette mainly comprises a battery assembly and an atomization assembly; when the smoking action of a smoker is detected, the battery component supplies power to the atomization component, so that the atomization component is in an open state; after the atomization component is opened, the heating wire generates heat, the tobacco tar is heated, evaporated and atomized to form aerosol simulating smoke, and therefore a user has a similar smoking feeling when smoking.

Present electron cigarette tobacco tar is sufficient when smoking the anterior segment, therefore the flue gas taste is pure, but the electron cigarette uses is opaque oil storage chamber, and the user can't see the tobacco tar surplus in the oil storage chamber to the electron cigarette also does not have the suggestion of tobacco tar surplus, warning function, leads to the smoking back end, and when the tobacco tar became few or exhausts, continues the smoking and leads to burning the condition of cotton peculiar smell, thereby brings very not good experience for the user.

That is to say, there is the technical problem that the electronic cigarette can not let the user know whether the tobacco tar is about to be exhausted, and continue smoking when the tobacco tar is about to be exhausted, resulting in burning cotton among the prior art.

Disclosure of Invention

The invention provides a method for detecting whether tobacco tar in an electronic cigarette is exhausted and the electronic cigarette, aiming at the technical problem that the electronic cigarette in the prior art cannot enable a user to know whether the tobacco tar is about to be exhausted and continue to smoke when the tobacco tar is about to be exhausted, so that the electronic cigarette burns cotton, and the method and the electronic cigarette realize that the electronic cigarette is controlled to stop working in time when the user uses the electronic cigarette and the tobacco tar is about to be exhausted, so that the cotton burning phenomenon is avoided, and the use experience of the user is improved.

In one aspect, the invention provides a method for detecting whether smoke oil in an electronic cigarette is exhausted, which comprises the following steps:

s1, when a smoking signal is detected, supplying power to a heating wire for atomizing tobacco tar in the electronic cigarette so as to enable the heating wire to work;

and S2, acquiring the temperature change speed of the heating wire, determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire.

Optionally, the electronic cigarette is provided with an oil guide component which is in contact with the heater and supplies oil to the heater, the heater atomizes the tobacco tar on the oil guide component to form smoke, and step S2 specifically includes the sub-steps of:

s21, acquiring a first temperature value of the heating wire at a first moment;

s22, when the temperature of the heating wire rises to a preset second temperature value, acquiring the time required by the temperature of the heating wire to rise from the first temperature value to the second temperature value, wherein the second temperature value is less than or equal to the temperature value when the oil guide component is cracked;

s23, calculating the temperature change speed of the heating wire based on the first temperature value, the second temperature value and the time, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than the preset value so as to stop supplying power to the heating wire.

Optionally, step S2 specifically includes: the temperature of the heating wire is detected through a temperature sensor so as to obtain the temperature change speed of the heating wire, and when the change speed is larger than a preset value, the fact that smoke oil in the electronic cigarette is exhausted is determined, and power supply for the heating wire is stopped.

Optionally, the temperature sensor is a thermocouple temperature sensor, and the thermocouple temperature sensor is connected with the end of the heating wire.

Optionally, after step S2, the method further includes the steps of:

s3, outputting alarm information to remind a user of the tobacco tar exhaustion; wherein, the alarm information comprises at least one of character information, voice information, vibration information and light information.

Optionally, step S2 specifically includes:

acquiring a voltage value of a voltage detection point in a circuit loop where the heating wire is located, calculating a resistance change amplitude of the heating wire in a preset time based on the voltage value, acquiring a temperature change speed of the heating wire based on the change amplitude, determining that smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value, and stopping supplying power to the heating wire; wherein the resistance of the heating wire changes with the change of temperature.

Optionally, the voltage detection point is a heating wire end.

Optionally, a voltage dividing resistor is connected in series in the power supply loop of the heating wire, and the step S2 of obtaining the voltage value at the end of the heating wire specifically includes:

and acquiring the voltage division values at two ends of the voltage division resistor, and acquiring the voltage value of the end part of the heating wire based on the power supply voltage of the power supply loop and the voltage division values.

Optionally, a microprocessor, and a first switch piece and a second switch piece electrically connected with the microprocessor and the heating wire are arranged in the electronic cigarette; the microprocessor, the second switch piece, the divider resistor and the heating wire are connected to two ends of the electronic cigarette battery to form a second loop;

when the microprocessor controls the first switch piece to be opened, the second switch piece is controlled to be closed so that the heating wire works, and when the microprocessor controls the second switch piece to be opened, the first switch piece is controlled to be closed so that the voltage value of the end part of the heating wire is obtained.

Optionally, the step S2 specifically includes the sub-steps of:

s24, acquiring a first voltage value of the end part of the heating wire at a first moment, and acquiring a second voltage value of the end part of the heating wire at a second moment, wherein the second moment is different from the first moment by the preset time;

s25, calculating the resistance change amplitude of the resistance of the heating wire in the preset time based on the first voltage value and the second voltage value, obtaining the temperature change speed of the heating wire based on the change amplitude, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than a preset value so as to stop supplying power to the heating wire.

In another aspect, the present invention provides an electronic cigarette, comprising: the detection control circuit is used for atomizing a heating wire of the tobacco tar and a power supply circuit for supplying power to the detection control circuit and the heating wire;

the detection control circuit is used for controlling the power supply circuit to supply power to the heating wire when a smoking signal is detected, so that the heating wire works, acquiring the temperature change speed of the heating wire, determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire.

Optionally, the detection control circuit includes: the temperature detection device comprises a microprocessor and a temperature detection sub-circuit connected with the microprocessor;

the microprocessor is used for controlling the power supply circuit to supply power to the heating wire when detecting a smoking signal so as to enable the heating wire to work;

the temperature detection sub-circuit is used for acquiring the temperature of the heating wire when the heating wire works;

the microprocessor is also used for calculating the temperature change speed of the heating wire based on the temperature, determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is greater than a preset value, and controlling the power supply circuit to stop supplying power to the heating wire.

Optionally, the detection control circuit includes: the voltage detection device comprises a microprocessor and a voltage detection sub-circuit connected with the microprocessor;

the voltage detection sub-circuit is used for acquiring a voltage value of a voltage detection point in a circuit loop where the heating wire is located when the heating wire works;

the microprocessor is also used for calculating the resistance change amplitude of the heating wire in preset time based on the voltage value, acquiring the temperature change speed of the heating wire based on the change amplitude, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value so as to stop supplying power to the heating wire; wherein the resistance of the heating wire changes with the change of temperature.

Optionally, the voltage detection point is a heating wire end, and the voltage detection sub-circuit includes:

the voltage division module is connected with the microprocessor and the end part of the heating wire and used for converting the voltage value into readable voltage so that the microprocessor calculates the resistance change amplitude of the heating wire in preset time based on the readable voltage, obtains the temperature change speed of the heating wire based on the change amplitude, and determines that the smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value so as to stop supplying power to the heating wire; wherein the readable voltage is a voltage that the microprocessor can recognize.

Optionally, the detection control circuit further includes: a first switching element connected to the microprocessor; the microprocessor is used for controlling the first switch part to be switched on or switched off so as to control the power supply circuit to supply power to the heating wire or stop supplying power;

the voltage detection sub-circuit further comprises: a second switching element connected to the microprocessor; the microprocessor is used for controlling the second switch to be switched on or switched off so as to control the voltage detection sub-circuit to detect and acquire the voltage value or stop detecting the voltage value.

Optionally, the first switch and the second switch are both field effect transistors;

the drain electrode of the first switch part is connected with the heating wire, the source electrode of the first switch part is grounded, and the microprocessor is connected with the grid electrode of the first switch part and is used for controlling the first switch part to be switched on or switched off so as to control the power supply circuit to supply power to the heating wire or stop supplying power;

the voltage division module comprises a first resistor, a second resistor and a first capacitor, one end of the first resistor is connected with the heating wire, the other end of the first resistor is connected with the second resistor, the first capacitor and the microprocessor, and the second resistor is connected with the other end of the first capacitor and is grounded;

the drain electrode of the second switch part is connected with the heating wire and the first resistor, the source electrode of the second switch part is grounded, and the microprocessor is connected with the grid electrode of the second switch part and used for controlling the second switch part to be switched on or switched off so as to control the voltage dividing module to acquire and convert the voltage value into readable voltage or stop acquiring the voltage value.

Optionally, the electronic cigarette further comprises: the alarm circuit is connected with the microprocessor;

the microprocessor is used for outputting alarm data to the alarm circuit when determining that the tobacco tar in the electronic cigarette is exhausted;

the alarm circuit is used for outputting alarm information based on the alarm data so as to remind a user of the exhaustion of tobacco tar; wherein, the alarm information comprises at least one of character information, voice information, vibration information and light information.

Optionally, the alarm circuit is specifically configured to display and output alarm information, and the alarm circuit includes: the display screen is connected with the microprocessor, and the awakening sub-circuit is connected with the microprocessor and the display screen;

the microprocessor is used for outputting a wake-up trigger signal to the wake-up sub-circuit and outputting alarm data for displaying output to the display screen when determining that the tobacco tar in the electronic cigarette is exhausted;

the awakening sub-circuit is used for awakening the display screen after receiving the awakening trigger signal; and the display screen displays and outputs text information for reminding the user of the exhaustion of the tobacco tar based on the alarm data after awakening.

Optionally, the power supply circuit has a functional module for charging an external device, and the electronic cigarette further includes a switch trigger circuit connected to the microprocessor, including:

the first trigger switch is used for outputting a first trigger signal which indicates that smoking action is detected to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to supply power to the heating wire based on the first trigger signal;

the second trigger switch is used for outputting a second trigger signal which indicates that the smoking power is increased to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to increase the output power to the heating wire based on the second trigger signal;

the third trigger switch is used for outputting a third trigger signal which represents that the smoking power is reduced to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to reduce the output power to the heating wire based on the third trigger signal;

and the fourth trigger switch is used for outputting a fourth trigger signal which represents charging to the external equipment to the microprocessor when receiving the trigger action, so that the microprocessor controls the power supply circuit to charge the external equipment based on the fourth trigger signal.

Optionally, the power supply circuit includes: the charging management sub-circuit is connected with the charging interface, the charging management sub-circuit, the battery and the charging sub-circuit;

the internal charging interface is used for being connected with an external power supply and acquiring electric energy;

the charging management sub-circuit is also connected with the microprocessor and used for carrying out charging management on the battery based on a battery charging management signal of the microprocessor;

the external charging electronic circuit is also connected with the microprocessor and used for charging external equipment based on the external charging control signal of the microprocessor.

One or more technical schemes provided by the invention at least have the following technical effects or advantages:

according to the scheme of the invention, when a smoking signal is detected, power is supplied to the heating wire for atomizing the tobacco tar in the electronic cigarette so as to enable the heating wire to work; and when the heating wire works, acquiring the temperature change speed of the heating wire, determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is greater than a preset value, and stopping supplying power to the heating wire. That is to say, by utilizing the characteristic that the specific heat capacity of the tobacco tar is greater than that of the heating wire (namely, the tobacco tar absorbs the heat generated by heating of the heating wire when the tobacco tar is available), the temperature rise speed of the heating wire in unit time is lower than that of the heating wire without the tobacco tar, whether the heating wire is contacted with the tobacco tar is known by detecting the temperature change speed of the heating wire, whether the tobacco tar in the electronic cigarette is exhausted is judged, and the power supply for the heating wire is stopped when the tobacco tar is determined to be exhausted; the electronic cigarette effectively solves the technical problem that the electronic cigarette in the prior art cannot enable a user to know whether the tobacco tar is about to be exhausted and continue smoking when the tobacco tar is about to be exhausted, so that the electronic cigarette is burnt, the electronic cigarette is used by the user, and when the tobacco tar is about to be exhausted, the electronic cigarette is controlled to stop working in time, so that the phenomenon of burning cotton is avoided, and the use experience of the user 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flowchart of a first method for detecting whether smoke oil in an electronic cigarette is exhausted according to an embodiment of the present invention;

fig. 2 is a flowchart of a second method for detecting whether smoke oil in an electronic cigarette is exhausted according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a circuit structure for detecting a temperature of a heater by a thermocouple sensor according to an embodiment of the present invention;

fig. 4 is a flowchart of a third method for detecting whether smoke in an electronic cigarette is exhausted according to an embodiment of the present invention;

fig. 5 is a block diagram of an internal structure of an electronic cigarette for detecting a temperature change of a heater by detecting a voltage at an end of the heater according to an embodiment of the present invention;

fig. 6 is a flowchart of a fourth method for detecting whether smoke in an electronic cigarette is exhausted according to an embodiment of the present invention;

fig. 7 is a block diagram of an internal circuit structure of a first electronic cigarette according to an embodiment of the present invention;

fig. 8A is a block diagram of an internal circuit structure of an electronic cigarette for detecting a temperature change of a heater based on a temperature detection sub-circuit according to an embodiment of the present invention;

fig. 8B is a block diagram of an internal circuit structure of an electronic cigarette for detecting a temperature change of a heater based on a voltage detection sub-circuit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a microprocessor and its peripheral circuits according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a circuit for detecting a voltage at an end of a heating wire by dividing voltages according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a linear voltage stabilizing circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a reset circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a display alarm circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a switch trigger circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 15A is a schematic diagram of a charging management sub-circuit of a power supply circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 15B is a schematic diagram of an external charging electronic circuit of a power supply circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 16 is a schematic diagram of a battery voltage detection circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention;

fig. 17 is a schematic diagram of a battery protection circuit used in an internal circuit of an electronic cigarette according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a method for detecting whether tobacco tar in an electronic cigarette is exhausted, which is used for solving the technical problem that the electronic cigarette in the prior art cannot enable a user to know whether the tobacco tar is about to be exhausted and continue to smoke when the tobacco tar is about to be exhausted, so that cotton burning is caused.

In order to solve the technical problems, the embodiment of the invention has the following general idea:

the embodiment of the invention provides a method for detecting whether tobacco tar in an electronic cigarette is exhausted, which comprises the following steps: s1, when a smoking signal is detected, supplying power to a heating wire for atomizing tobacco tar in the electronic cigarette so as to enable the heating wire to work; and S2, acquiring the temperature change speed of the heating wire, determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire.

Therefore, in the embodiment of the invention, by utilizing the characteristic that the specific heat capacity of the tobacco tar is greater than that of the heating wire (namely, the tobacco tar absorbs the heat generated by heating of the heating wire when the tobacco tar is available), the temperature rise speed of the heating wire in unit time is lower than that when the tobacco tar is not available, whether the heating wire is contacted with the tobacco tar or not is known by detecting the temperature change speed of the heating wire, so that whether the tobacco tar in the electronic cigarette is exhausted or not is judged, and the power supply for the heating wire is stopped when the tobacco tar is determined to be exhausted; the electronic cigarette effectively solves the technical problem that the electronic cigarette in the prior art cannot enable a user to know whether the tobacco tar is about to be exhausted and continue smoking when the tobacco tar is about to be exhausted, so that the electronic cigarette is burnt, the electronic cigarette is used by the user, and when the tobacco tar is about to be exhausted, the electronic cigarette is controlled to stop working in time, so that the phenomenon of burning cotton is avoided, and the use experience of the user is improved.

In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.

Example one

Referring to fig. 1, an embodiment of the present invention provides a method for detecting whether smoke oil in an electronic cigarette is exhausted, including the following steps:

Specifically, the specific heat capacity of the heating wire when no tobacco tar is adhered is set to be A, the specific heat capacity of the tobacco tar is set to be B (larger than A), and the specific heat capacity of the heating wire when the tobacco tar is adhered to is set to be C, wherein C is larger than A and smaller than B; from the physical definition of specific heat capacity: the internal energy absorbed or released per unit mass of an object changes per unit temperature, that is, the specific heat capacity of the object can directly reflect the temperature change speed thereof. In this scheme, through the temperature change speed that detects the heater, the current specific heat capacity of heater can be known to this temperature change speed of rethread, can know whether the heater is stained with the tobacco tar. In other words, by judging whether the temperature change speed of the heating wire is greater than a preset value, namely judging whether the current specific heat capacity of the heating wire is similar to the specific heat capacity of the heating wire when no tobacco tar is adhered, when the temperature change speed of the heating wire is greater than the preset value, the current specific heat capacity of the heating wire is similar to the specific heat capacity (A) of the heating wire, and further indicating that no tobacco tar is adhered to the heating wire or the amount of adhered tobacco tar is very small, the electronic cigarette can be determined to be exhausted, and the power supply for the heating wire is stopped.

Further, in a specific implementation process, the temperature values of the start time and the end time of a certain preset time period may be obtained, and the temperature change of the heating wire is calculated according to the two temperature values and the preset time, referring to fig. 2, the electronic cigarette is provided with an oil guide component which is in contact with the heating wire and supplies oil to the heating wire, the heating wire atomizes the smoke oil on the oil guide component to form smoke, and the step S2 specifically includes the sub-steps of:

s21, acquiring a first temperature value of the heating wire at a first moment;

It should be noted that, in the step S22, the temperature at which the oil guiding member is cracked is the maximum temperature that the oil guiding member can withstand, and in a specific application, the temperature at which the oil guiding member is heated to start to change color may be set to the upper limit of the second temperature value, and the temperature at which the oil guiding member starts to change color may be different according to different materials of the oil guiding member, and is not specifically limited herein.

In the specific implementation process, the temperature of the heating wire can be detected through a temperature sensor, the temperature sensor is a thermocouple temperature sensor, and the thermocouple temperature sensor is connected with the end part of the heating wire. As shown in fig. 3, the thermocouple temperature sensor includes: a first end wire 32 and a second end wire 33 connected to an end 311 of the heating wire 31; the first end wire 32 and the second end wire 33 are made of two metal wires (including alloy wires and non-alloy wires) made of different materials, such as copper, iron, constantan, and the like. In fig. 3, the other end 312 of the heating wire 31 opposite to the end 311 is connected to one end of the electronic wire 34 (which may be a general conductive wire); the other end of the electronic wire 34 is connected with the anode of the battery, and the other end of the second end wire 33 is connected with the ground to form a power supply loop of the heating wire 31; the ends of the first end line 32 and the second end line 33 far away from the heating wire 31 are connected with a signal amplifier 35 for forming a temperature detection loop of the heating wire 31. On one hand, when a smoking signal is obtained, the microprocessor 36 of the electronic cigarette controls the conduction of a power supply loop of the heating wire 31, the heating wire 31 is electrified to generate heat, a temperature difference is formed at two ends of a first end wire 32 (such as nickel-chromium material) and a second end wire 33 (such as constantan material), and an electromotive force signal is output at cold ends of a high-impedance alloy wire and a low-impedance metal wire according to a thermocouple temperature measurement principle; on the other hand, the signal input end of the signal amplifier 35 is connected to the cold ends of the first end line 32 and the second end line 33 to obtain the electromotive force signal, amplify the electromotive force signal, and further send the amplified electromotive force signal to the microprocessor 36 of the electronic cigarette for processing, so as to obtain the current temperature value of the heating wire 31.

In a specific implementation process, the temperature change speed of the heating wire can be obtained by detecting the resistance change amplitude of the heating wire, that is, the step S2 is specifically: acquiring a voltage value of a voltage detection point in a circuit loop where the heating wire is located, calculating a resistance change amplitude of the heating wire in a preset time based on the voltage value, acquiring a temperature change speed of the heating wire based on the change amplitude, determining that smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value, and stopping supplying power to the heating wire; wherein the resistance of the heating wire changes with the change of temperature. Wherein, the voltage detection point can be the end of the heating wire.

Specifically, in the scheme, the resistance change amplitude of the heating wire is obtained by detecting the voltage value of the heating wire in the preset time (namely unit time), so that the temperature change speed of the heating wire can be obtained, and then the current specific heat capacity of the heating wire can be obtained through the temperature change speed; judging whether the resistance change speed of the heating wire is larger than a preset value, namely judging whether the current specific heat capacity of the heating wire is similar to the specific heat capacity of the heating wire when no smoke oil is adhered to the heating wire, when the resistance change speed is larger than the preset value, namely, explaining that the current specific heat capacity of the heating wire is similar to the specific heat capacity of the heating wire, further showing that no smoke oil is adhered to the heating wire or the amount of adhered smoke oil is very small, determining that the smoke oil in the electronic cigarette is exhausted, and stopping supplying power to the heating wire.

Referring to fig. 4, the step S2 specifically includes the following sub-steps:

Specifically, during the operation of the heating wire, the resistance of the heating wire is continuously changed along with the accumulation of the heating time, and the power calculation formula P is U²the/R is known as follows: on the premise that the heating power (P) of the heating wire is constant, the voltage (U) at the end part of the heating wire is increased along with the increase of the resistance (R) of the heating wire or is decreased along with the decrease of the resistance (R) of the heating wire. That is, the variation of the heater end voltage (U) reflects the variation of the heater resistance (R), and the resistance variation of the heater in the preset time (t) is further determined by respectively obtaining the voltage values at the starting time (i.e., the first time) and the ending time (i.e., the second time) of the preset time, and determining the resistance (Rt1) of the heater at the first time and the resistance (Rt2) of the heater at the second time based on the two voltage values (i.e., the first voltage value and the second voltage value): the electronic cigarette comprises a heater, a first Rt1-Rt 2I/t, a second Rt1-Rt 2I/t, a third Rt 2I/t, a fourth Rt1-Rt 2I/t, a fourth Rt 2-Rt, a fifth Rt, a sixth Rt, a fifth Rt, a sixth Rt; wherein the preset value is determined according to the specific heat capacity characteristic of the heating wireAnd is not particularly limited.

In the specific implementation process, the measured end voltage of the heating wire may be larger, and in order to reduce the difficulty of measuring the voltage by obtaining a smaller voltage value and reflecting the larger end voltage of the heating wire by the smaller voltage value, please refer to fig. 5, a voltage dividing resistor 51 (for voltage division) may be connected in series in the power supply loop of the heating wire 50, and the step S2 obtains the end voltage value of the heating wire 50, specifically: and acquiring a voltage division value at two ends of the voltage division resistor 51, and acquiring a voltage value at the end of the heating wire 50 based on the power supply voltage of the power supply loop and the voltage division value. Specifically, referring to fig. 5, the electronic cigarette is provided with a microprocessor 52, and a first switch member 53 and a second switch member 54 electrically connected to the microprocessor 52 and the heating wire 50; the microprocessor 52, the first switch 53 and the heating wire 50 are connected to two ends of the battery of the electronic cigarette to form a first loop, and the microprocessor 52, the second switch 54, the voltage dividing resistor 51 and the heating wire 50 are connected to two ends of the battery of the electronic cigarette to form a second loop; when the microprocessor 52 controls the first switch 53 to be turned on, the second switch 54 is controlled to be turned off, so that the heating wire 50 works, and when the microprocessor 52 controls the second switch 54 to be turned on, the first switch 53 is controlled to be turned off, so that the voltage value at the end of the heating wire 50 is obtained.

In a specific implementation process, in order to remind the user when it is determined that the electronic cigarette liquid is about to be exhausted, referring to fig. 6, after step S2, the method further includes the steps of:

s3, outputting alarm information to remind a user of the tobacco tar exhaustion; wherein, the alarm information comprises at least one of character information, voice information, vibration information and light information. Correspondingly, can set up the display module who is used for showing text message in the electron cigarette, be used for broadcasting voice information's audio module, be used for sending vibration information's vibration module or be used for sending light information's LED lamp, wherein, light information can be the light information of luminance difference or the light information of colour difference etc..

All in all, through implementing the above-mentioned technical scheme of this application, when the user smokes, and the tobacco tar is about to exhaust, can in time control the electron cigarette stop work to avoid the cotton phenomenon of burning to take place, can also remind the user tobacco tar to exhaust simultaneously, thereby improve user's use and experience.

Example two

Based on the same inventive concept, please refer to fig. 7, the invention further provides an electronic cigarette, comprising: the device comprises a detection control circuit 1, a heating wire 2 for atomizing tobacco tar and a power supply circuit 3 for supplying power to the detection control circuit 1 and the heating wire 2;

the detection control circuit 1 is used for controlling the power supply circuit 3 to supply power to the heating wire 2 when a smoking signal is detected, so that the heating wire 2 works, acquiring the temperature change speed of the heating wire, determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire.

In a specific implementation process, referring to fig. 8A, the detection control circuit 1 includes: a microprocessor 10 and a temperature detection sub-circuit 11 connected to the microprocessor 10; the microprocessor 10 is used for controlling the power supply circuit 3 to supply power to the heating wire 2 when detecting a smoking signal so as to enable the heating wire 2 to work; the temperature detection sub-circuit 11 is used for acquiring the temperature of the heating wire 2 when the heating wire 2 works; the microprocessor 10 is further configured to calculate a temperature change speed of the heating wire 2 based on the temperature, determine that the tobacco tar in the electronic cigarette is exhausted when the change speed is greater than a preset value, and control the power supply circuit 3 to stop supplying power to the heating wire 2. The temperature detection sub-circuit 11 may use a temperature sensor to detect the temperature of the heating wire 2, the temperature sensor is a thermocouple temperature sensor, and the thermocouple temperature sensor is connected to the end of the heating wire, as shown in fig. 3, which is not described in detail herein.

In a specific implementation process, referring to fig. 8B, the detection control circuit 1 includes: a microprocessor 10 and a voltage detection sub-circuit 12 connected to the microprocessor 10;

the microprocessor 10 is used for controlling the power supply circuit 3 to supply power to the heating wire 2 when detecting a smoking signal so as to enable the heating wire 2 to work;

the voltage detection sub-circuit 12 is configured to obtain a voltage value of a voltage detection point (such as a heater end) in a circuit loop where the heater 2 is located when the heater 2 operates;

the microprocessor 10 is further configured to calculate a resistance variation amplitude of the heating wire 2 within a preset time based on the voltage value, obtain a temperature variation speed of the heating wire 2 based on the variation amplitude, determine that smoke in the electronic cigarette is exhausted when the variation speed is greater than a preset value, and control the power supply circuit 3 to stop supplying power to the heating wire 2; wherein the resistance of the heating wire 2 changes with the change of temperature.

Further, still referring to fig. 8B, when the voltage detecting point is the end of the heating wire, the voltage detecting sub-circuit 12 includes:

the voltage division module 121 is connected with the microprocessor 10 and the end of the heating wire 2, and is used for converting the voltage value into a readable voltage, so that the microprocessor 10 calculates the resistance change amplitude of the heating wire 2 in a preset time based on the readable voltage, obtains the temperature change speed of the heating wire 2 based on the change amplitude, and determines that the smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value, so as to stop supplying power to the heating wire 2; wherein the readable voltage is a voltage that the microprocessor 10 can recognize.

Further, still referring to fig. 8B, the detection control circuit 1 further includes: a first switching element 13 connected to the microprocessor 10; the microprocessor 10 is used for controlling the first switch part 13 to be switched on or switched off so as to control the power supply circuit 3 to supply power to the heating wire 2 or stop supplying power;

the voltage detection sub-circuit 12 further comprises: a second switching element 122 connected to the microprocessor 10; the microprocessor 10 is configured to control the second switch 122 to be turned on or off, so as to control the voltage detection sub-circuit 12 to detect the voltage value or stop detecting the voltage value.

In a specific implementation process, the first switching element 13 and the second switching element 122 are both field effect transistors; the drain of the first switch 13 is connected to the heating wire 2, the source of the first switch 13 is grounded, and the microprocessor 10 is connected to the gate of the first switch 13 and is configured to control the first switch 13 to be turned on or off so as to control the power supply circuit 3 to supply power to the heating wire 2 or stop supplying power; the voltage dividing module 121 comprises a first resistor, a second resistor and a first capacitor, one end of the first resistor is connected with the heating wire 2, the other end of the first resistor is connected with the second resistor, the first capacitor and the microprocessor, and the second resistor is connected with the other end of the first capacitor and grounded; the drain of the second switch 122 is connected to the heater 2 and the first resistor, the source of the second switch 122 is grounded, and the microprocessor 10 is connected to the gate of the second switch 122 and is configured to control the second switch 122 to be turned on or off, so as to control the voltage dividing module 121 to obtain and convert the voltage value into a readable voltage or stop obtaining the voltage value.

Taking a specific internal circuit of an electronic cigarette as an example, please refer to fig. 9 and 10, the microprocessor 10 in fig. 8B corresponds to the single chip microcomputer STM32F030K6 in fig. 9, and the heating wire 2, the first switch 13 and the second switch 122 in fig. 8B correspond to the heating wire L, the field effect transistor Q1 and the Q2 in fig. 10, respectively; the letters on the terminals in fig. 9 and 10 indicate that the signal identifiers transmitted and a plurality of terminals marked with the same signal identifiers are connected, and in addition, other specific circuit diagrams in the embodiment also follow the same rule. With reference to fig. 9 and 10, an O + terminal of the heater L (generally about 0.3 ohm) is connected to the battery anode B +, an O-terminal of the heater L is connected to a drain of the fet Q1, a source of the fet Q1 is grounded, and an end of the 14 th pin PB0 of the one-chip microcomputer STM32F030K6 is connected to a gate of the fet Q1, and is configured to transmit a PWM wave signal identified as DRIV to control the Q1 to be turned on or off, so as to control the power supply loop of the heater L to be turned on or off.

Further, the first resistor, the second resistor, and the first capacitor of the voltage dividing module 121 in fig. 8B correspond to the resistor R38, the resistor R39, and the capacitor C22 in fig. 10, respectively. One end of the resistor R38 is connected with the O-end of the heating wire L, the other end of the resistor R38 is connected with the resistor R39, the capacitor C22 and the No. 8 pin PA2 end of the singlechip STM32F030K6, and the other ends of the resistor R39 and the capacitor C22 are connected with each other and grounded. The drain electrode of the field effect transistor Q2 is connected with the O-end of the heating wire L and the resistor R38, the source electrode of the field effect transistor Q2 is grounded, and the No. 15 pin PB1 end of the single chip microcomputer STM32F030K6 is connected with the grid electrode of the field effect transistor Q2 and used for controlling the on-off of the field effect transistor Q2 so as to control a voltage division module composed of the resistors R38 and R39 and the capacitor C22 to acquire the voltage value of the O-end of the heating wire and convert the voltage value into readable voltage of the single chip microcomputer STM32F030K6 or stop acquiring the voltage value. This is because the voltage value that can be recognized by the microprocessor may be limited according to the type of the microprocessor, for example, in the specific implementation circuit shown in fig. 9 and 10, the single chip microcomputer STM32F030K6 can read the voltage value lower than 3V, however, the power supply voltage of the electronic cigarette battery to the heating wire L is usually about 4.2V, that is, in the case of normal battery capacity, the O-terminal voltage value of the heating wire L is above 3V, in this embodiment, by providing the voltage division module, the microprocessor can read a voltage value lower than 3V through the voltage division module, and indirectly read the voltage value of the O-terminal of the heating wire through this lower voltage value.

It should be noted that the drain of the fet Q1 is directly connected to the O-terminal of the heater L, and the drain of the fet Q2 is connected to the O-terminal of the heater L through a resistor R41 having a certain resistance (e.g., 3 ohms), so that when Q1 and Q2 are turned on simultaneously, the current output from the O-terminal of the heater L flows directly from Q1 to ground, and the Q2 branch is inactive. Thus, in this scenario, the control logic for Q1 and Q2 is: when the single chip microcomputer STM32F030K6 controls the field effect transistor Q1 to be turned on, the field effect transistor Q2 is controlled to be turned off, so that the heating wire L works; when the single chip microcomputer STM32F030K6 controls the field effect transistor Q2 to be turned on, the field effect transistor Q1 is controlled to be turned off so as to obtain the voltage value of the end part of the heating wire L.

In a specific implementation process, still referring to fig. 8B, the electronic cigarette further includes: and the linear voltage stabilizing circuit 4 is connected with the power supply circuit 3 and the microprocessor 10 and is used for adjusting the working voltage provided by the power supply circuit 3 to the microprocessor 10 so as to stabilize the adjusted working voltage at the rated working voltage of the microprocessor 10. Specifically, as shown in fig. 11, a schematic diagram of a linear voltage stabilizing circuit used in an internal circuit of an electronic cigarette is shown, and with reference to fig. 9 and 11, a rated operating voltage of a monolithic computer STM32F030K6 in fig. 9 is 3V, and a positive voltage of a battery in fig. 11 is input into a voltage regulator TLV70430 through a voltage regulator tube D5, so as to regulate a voltage greater than 3V output by the battery of the electronic cigarette, and output a stable VDD voltage of 3V to a microprocessor (i.e., a VDD terminal of pin 1 of monolithic computer STM32F030K6 in fig. 9), so as to provide the microprocessor with an operating voltage capable of enabling the microprocessor to operate normally.

In a specific implementation process, still referring to fig. 8B, the electronic cigarette further includes: and the reset circuit 5 is connected with the microprocessor 10 and is used for detecting the internal working voltage of the microprocessor 10 and outputting a reset signal to the microprocessor 10 when the internal working voltage is lower than a first preset voltage. Specifically, as shown in fig. 12, a schematic diagram of a reset circuit used in an internal circuit of an electronic cigarette is shown, with reference to fig. 9 and 12, an input terminal Vin of the reset circuit is connected to a VDD terminal of pin 1 of a single chip microcomputer STM32F030K6, an output terminal Vout of the reset circuit is connected to an NRST terminal of pin 4 of the single chip microcomputer STM32F030K6, and the reset circuit detects and obtains the VDD voltage of the single chip microcomputer STM32F030K6, and sends a reset signal (e.g., a low level signal) to the NRST terminal of pin 4 of the single chip microcomputer STM32F030K6 when the VDD voltage is lower than 2.2V, so as to reset a microprocessor, thereby preventing the microprocessor from being out of.

In a specific implementation process, still referring to fig. 8B, the electronic cigarette further includes: an alarm circuit 6 connected to the microprocessor 10; the microprocessor 10 is used for outputting alarm data to the alarm circuit 6 when determining that the tobacco tar in the electronic cigarette is exhausted; the alarm circuit 6 is used for outputting alarm information based on the alarm data so as to remind a user of the exhaustion of tobacco tar; wherein, the alarm information comprises at least one of character information, voice information, vibration information and light information. Correspondingly, can set up the display module who is used for showing text message in the electron cigarette, be used for broadcasting voice information's audio module, be used for sending vibration information's vibration module or be used for sending light information's LED lamp, wherein, light information can be the light information of luminance difference or the light information of colour difference etc..

In a specific embodiment, the alarm circuit 6 is configured to display and output an alarm message, and the alarm circuit 6 includes: the display screen is connected with the microprocessor 10, and the wake-up sub-circuit is connected with the microprocessor 10 and the display screen; the microprocessor 10 is configured to output a wake-up trigger signal to the wake-up sub-circuit when it is determined that the tobacco tar in the electronic cigarette is exhausted, and output alarm data for display output to the display screen; the awakening sub-circuit is used for awakening the display screen after receiving the awakening trigger signal; and the display screen displays and outputs text information for reminding the user of the exhaustion of the tobacco tar based on the alarm data after awakening. Specifically, as shown in fig. 13, it is a schematic diagram of a display alarm circuit used in an internal circuit of an electronic cigarette, and with reference to fig. 9 and 13, the alarm circuit comprises a 96 x 16 lattice organic electroluminescent display panel OLED and a wake-up sub-circuit connected with the same, the wake-up sub-circuit comprises a PNP type triode Q3, an NPN type triode Q4 and a P channel field effect transistor Q5, wherein the base electrode of the triode Q3 is connected with the end of a No. 21 pin PA11 of a single chip microcomputer STM32F030K6, the emitter electrode of the triode Q3 is connected with input VDD voltage, the collector electrode of the triode Q4 is connected with the No. 8 pin of a display screen, the base electrode of the triode Q3583 is connected with the collector electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q5 is connected with a positive voltage end B + of a battery through a resistor R51, the source electrode of the triode Q5 is directly connected with the positive voltage end B + of the battery.

The working principle of the display alarm circuit is as follows: under the condition that the electronic cigarette smoke is sufficient, the single chip microcomputer STM32F030K6 outputs a high-level signal to the base electrode of the triode Q3 through the No. 21 pin PA11 end, so that the triodes Q3 and Q4 and the field-effect tube Q5 are all in an off state, and the display screen is powered off; when the microprocessor determines that the electronic cigarette smoke is about to be exhausted, a wakeup trigger signal (such as a low level signal) is output to the base electrode of the triode Q3 through the No. 21 pin PA11, at the moment, the triode Q3 is conducted, and further the triode Q4 and the field effect transistor Q5 are sequentially conducted and are electrified for working of the display screen. The power is supplied to the display screen when needed, and the power is cut off when not needed, so that the power saving effect is realized. In addition, still please refer to fig. 9 and 13, the terminal SCL of pin 10 and the terminal SDA of pin 11 of the display screen are respectively connected to the terminal PA9 and the terminal PA10 of pin 19 of the single chip microcomputer STM32F030K6, that is, the alarm data for display output is written into the display screen through the terminal PA9 of pin 19 and the terminal PA10 of pin 20 of the single chip microcomputer STM32F030K6, so that the display screen displays and outputs text information for reminding the user of oil smoke exhaustion based on the alarm data after waking up.

In a specific implementation process, still referring to fig. 8B, the power supply circuit 3 has a function module for charging an external device, and the electronic cigarette further includes a switch triggering circuit 7 connected to the microprocessor 10, including: a first trigger switch 71, configured to output a first trigger signal indicating that a smoking motion is detected to the microprocessor 10 when a trigger motion is received, so that the microprocessor 10 controls the power supply circuit 3 to supply power to the heater 2 based on the first trigger signal; a second trigger switch 72, configured to output a second trigger signal indicating that the smoking power is increased to the microprocessor 10 when receiving a trigger action, so that the microprocessor 10 controls the power supply circuit 3 to increase the output power to the heater 2 based on the second trigger signal; a third trigger switch 73, configured to output a third trigger signal indicating that the smoking power is reduced to the microprocessor 10 when receiving a trigger action, so that the microprocessor 10 controls the power supply circuit 3 to reduce the output power to the heater 2 based on the third trigger signal; and a fourth trigger switch 74, configured to output a fourth trigger signal indicating charging to an external device to the microprocessor 10 when receiving a trigger operation, so that the microprocessor 10 controls the power supply circuit 3 to charge the external device based on the fourth trigger signal.

Specifically, please refer to fig. 14, which is a schematic diagram of a switch trigger circuit adopted in an internal circuit of an electronic cigarette, wherein a first trigger switch 71, a second trigger switch 72, a third trigger switch 73, and a fourth trigger switch 74 in fig. 8B correspond to switches (S1-S4) in fig. 14, respectively, the switches (S1-S4) in fig. 14 are connected in parallel with each other, and are connected to a PB7 end of a No. 30 pin PB 32F030K6, a PB4 end of a No. 27 pin PB4 end, a PB5 end of a No. 28 pin PB5 and a PB3 end of a No. 26 pin PB3 of a single chip microcomputer STM32F030K6, respectively, and transmit switch signals KEY, KEY +, KEY-, and KEY _0 to the single chip microcomputer STM32F 030K. When the switch S1 receives a trigger action, a level signal (such as a high level signal) indicating that a smoking action is detected is output to the single chip microcomputer STM32F030K6, so that the microprocessor controls a power supply loop of the heating wire L to be switched on based on the high level signal, and when the switch S1 does not receive the trigger action, the No. 30 pin PB7 end of the microprocessor does not detect the high level signal and controls the power supply loop of the heating wire L to be switched off; when the switch S2 receives a trigger action, a level signal (such as a high level signal) which indicates that the smoking power is increased is output to the singlechip STM32F030K6, so that the singlechip STM32F030K6 adjusts the duty ratio of a PWM wave for controlling the conduction of the field effect transistor Q1 based on the high level signal to increase the output power to the heating wire L, and when the switch S2 does not receive the trigger action, the high level signal is not detected at the No. PB4 end of the microprocessor 27, and the duty ratio of the PWM wave for controlling the conduction of the field effect transistor Q1 is kept unchanged; when the switch S3 receives a trigger action, a level signal (such as a low level signal) indicating that smoking power is reduced is output to the singlechip STM32F030K6, so that the singlechip STM32F030K6 adjusts the duty ratio of a PWM wave for controlling the conduction of the field effect transistor Q1 based on the low level signal to reduce the output power to the heating wire L, and when the switch S3 does not receive the trigger action, the end of a No. 28 pin PB5 of the singlechip STM32F030K6 does not detect the low level signal and keeps the duty ratio of the PWM wave for controlling the conduction of the field effect transistor Q1 unchanged; when the switch S4 receives the trigger action, a level signal (such as a high level signal) indicating that the electronic cigarette is charged to the external device is output to the single chip microcomputer STM32F030K6, so that the single chip microcomputer STM32F030K6 controls the power supply circuit of the electronic cigarette to charge the external device based on the high level signal, and when the switch S4 does not receive the trigger action, the high level signal is not detected at the pin PB3 end No. 26 of the single chip microcomputer STM32F030K6, and the power supply circuit of the electronic cigarette is controlled to stop charging the external device.

In a specific implementation process, still referring to fig. 8B, the power supply circuit 3 includes: an internal charging interface 31, a charging management sub-circuit 32, a battery 33 and an external charging sub-circuit 34 which are connected in sequence; the internal charging interface 31 is used for being connected with an external power supply and obtaining electric energy; the charging management sub-circuit 32 is further connected to the microprocessor 10, and is configured to perform charging management on the battery 33 based on a battery charging management signal of the microprocessor 10; the external charging sub-circuit 34 is further connected to the microprocessor 10, and is configured to charge an external device based on an external charging control signal of the microprocessor 10. Further, the external charging sub-circuit 34 includes: a third switch connected to the microprocessor 10, a fourth switch connected to the third switch and the battery 33, a boost module connected to the battery 33 through the fourth switch, and an external charging interface connected to the boost module 343 and used for connecting to an external device; the third switch piece is used for conducting when the external charging control signal is acquired, so that the fourth switch piece is conducted, and the boosting module is communicated with the battery; the boosting module boosts the voltage of the battery and transmits the boosted voltage to external equipment through the external charging interface.

Specifically, referring to fig. 15A and 15B, which are schematic diagrams of a power supply circuit used in an internal circuit of an electronic cigarette, the circuit in fig. 15A and the circuit in fig. 15B are connected through a terminal Um. The P1 interface in fig. 15A (corresponding to the internal charging interface 31 in fig. 8B) is a USB interface for charging the electronic cigarette from the outside, the pin 1 of the P1 is connected to the battery charging management chip AP5056, and the

pins

6 and 7 of the AP5056 are respectively connected to the pin PF1 end of the pin 3 and the pin PF0 end of the pin 2 of the monolithic computer in fig. 9, and are used for receiving the battery charging management signal sent by the monolithic computer and managing the charging of the battery. Specifically, when the battery needs to be charged, the single chip microcomputer outputs a low level signal to the No. 7 pin of the AP5056 through the No. 2 pin PF0 end and outputs a high level signal to the No. 6 pin of the AP5056 through the No. 3 pin PF1 end, so that the electronic cigarette battery is in a charging state; on the contrary, when the battery is charged, the single chip outputs a high level signal to the pin 7 of the AP5056 through the terminal PF0 of the pin 2, and outputs a low level signal to the pin 6 of the AP5056 through the terminal PF1 of the pin 3, so that the electronic cigarette battery is in a state of being charged. Fig. 15B shows a schematic diagram of an external charging sub-circuit of an electronic cigarette, in which a voltage signal output from a positive voltage output terminal B + of a battery is filtered by capacitors C19 and C20, and then input to a boost module mainly including a current mode boost converter MT3608 for boost processing, so as to boost the battery voltage (e.g., 4V) of the electronic cigarette to a voltage of 5V required for charging a general electronic device (e.g., a mobile phone), and output the voltage through a P2 interface (which may be a USB interface). Further, in order to manage the external charging function of the electronic cigarette, as shown in fig. 15B, the external charging sub-circuit includes: and a triode Q7 which is connected in series with a field effect transistor Q6 and a single chip microcomputer STM32F030K6 in a power supply circuit of the boost converter MT3608, wherein the base electrode of the triode Q6 is connected with the single chip microcomputer STM 030K6, and the collector electrode of the triode Q7 is connected with the grid electrode of Q6. With reference to fig. 9, 14 and 15B, when the switch S4 receives the trigger signal, the single chip outputs a high level signal to the base of the transistor Q7 through the No. 13 pin PA7, so that the transistor Q7 and the field effect transistor Q6 are both turned on, and the boost module is powered on and supplies power to the outside through the P2 interface. Correspondingly, in order to prohibit the electronic cigarette battery from supplying power to external equipment in the process of charging the electronic cigarette battery, when the battery is charged, the single chip microcomputer STM32F030K6 outputs a low-level signal to the base electrode of the triode Q7 through the No. 13 pin PA7 end, so that the triode Q7 and the field effect transistor Q6 are both in a closed state, and the MT3608 cannot work.

In addition, referring to fig. 9 and fig. 15A, pin 2-4 of the P1 interface is connected to pin 4, pin 24, and pin 23 of the single chip microcomputer STM32F030K6, and can be used to program the single chip microcomputer STM32F030K 6.

In a specific implementation process, still referring to fig. 8B, the electronic cigarette further includes: and the battery voltage detection circuit 8 is connected with the power supply circuit 3 and is used for detecting the voltage of the battery in the power supply circuit 3 and controlling the power supply circuit 3 to stop supplying power to the heating wire 2 when the voltage of the battery is lower than a second preset voltage. Specifically, referring to fig. 16, the battery voltage detection circuit formed by the resistors R44 and R45 and the capacitor C25 controls the battery not to supply power to the heating wire when the voltage of the battery is less than 3.3V.

In a specific implementation process, still referring to fig. 8B, the electronic cigarette further includes: and the battery protection circuit 9 is connected with two ends of the battery in the power supply circuit 3 and is used for carrying out overcharge, overdischarge or short-circuit protection on the battery. Specifically, referring to fig. 17, the battery protection circuit includes a battery protection integrated chip MM3280 and a field effect transistor Q8, wherein a terminal VDD of pin 5 of MM3280 is connected to a positive voltage output terminal B + of the battery, and a terminal VSS of pin 6 is connected to a negative voltage output terminal B-of the battery, for detecting whether the battery is abnormal (such as overcharged, overdischarged, or short-circuited); the No. 1 pin DO end of the MM3280 is connected with the grid of the field effect transistor Q8 and is used for controlling the conduction of the field effect transistor Q8 when the battery is detected to be abnormal so as to protect the battery.

To sum up, the electron cigarette in this application scheme is at user's smoking, and when the tobacco tar is about to exhaust, can in time control electron cigarette stop work to avoid the cotton phenomenon of burning to take place, can also remind user's tobacco tar to exhaust simultaneously, thereby improve user's use and experience. In addition, this electron cigarette still possesses functions such as charging, managing and protecting the battery to outside electronic equipment, and the function is diversified and the stable performance has fine practicality.

According to the above description, the method for detecting whether the tobacco tar in the electronic cigarette is exhausted is implemented in the electronic cigarette, so that one or more embodiments of the electronic cigarette are the same as one or more embodiments of the method, and are not repeated herein.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for detecting whether tobacco tar in an electronic cigarette is exhausted is characterized by comprising the following steps:

s2, acquiring the temperature change speed of the heating wire, determining that the tobacco tar in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire;

the electronic cigarette is provided with an oil guide component which is in contact with the heating wire and supplies oil to the heating wire, the heating wire atomizes the tobacco tar on the oil guide component to form smoke, and the step S2 specifically comprises the following substeps:

s21, acquiring a first temperature value of the heating wire at a first moment;

s23, calculating the temperature change speed of the heating wire based on the first temperature value, the second temperature value and the time, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than the preset value so as to stop supplying power to the heating wire;

s24, simultaneously acquiring a first voltage value of the end part of the heating wire at a first moment, and acquiring a second voltage value of the end part of the heating wire at a second moment, wherein the second moment is different from the first moment by the preset time;

s25, calculating the resistance change amplitude of the resistance of the heating wire in the preset time based on the first voltage value and the second voltage value, obtaining the temperature change speed of the heating wire based on the change amplitude, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than a preset value so as to stop supplying power to the heating wire;

a voltage dividing resistor is connected in series in a power supply loop of the heating wire, and the step S24 of obtaining the voltage value at the end of the heating wire specifically includes:

acquiring the voltage division values at two ends of the voltage division resistor, and acquiring the voltage value of the end part of the heating wire based on the power supply voltage of the power supply loop and the voltage division values;

the electronic cigarette is internally provided with a microprocessor, a first switch piece and a second switch piece which are electrically connected with the microprocessor and the heating wire; the microprocessor, the second switch piece, the divider resistor and the heating wire are connected to two ends of the electronic cigarette battery to form a second loop;

when the microprocessor controls the first switch piece to be turned on, the second switch piece is controlled to be turned off so that the heating wire works, and when the microprocessor controls the second switch piece to be turned on, the first switch piece is controlled to be turned off so that a voltage value of the end part of the heating wire is obtained;

the electronic cigarette also comprises a switch trigger circuit connected with the microprocessor, and the switch trigger circuit comprises four trigger switches respectively connected with the microprocessor; the first trigger switch is used for outputting a first trigger signal which indicates that smoking action is detected to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to supply power to the heating wire based on the first trigger signal; the second trigger switch is used for outputting a second trigger signal which indicates that the smoking power is increased to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to increase the output power to the heating wire based on the second trigger signal; the third trigger switch is used for outputting a third trigger signal which represents that the smoking power is reduced to the microprocessor when a trigger action is received, so that the microprocessor controls the power supply circuit to reduce the output power to the heating wire based on the third trigger signal; and the fourth trigger switch is used for outputting a fourth trigger signal which represents charging to the external equipment to the microprocessor when receiving the trigger action, so that the microprocessor controls the power supply circuit to charge the external equipment based on the fourth trigger signal.

2. The method for detecting whether the tobacco tar in the electronic cigarette is exhausted according to claim 1, wherein the step S2 specifically includes: the temperature of the heating wire is detected through a temperature sensor so as to obtain the temperature change speed of the heating wire, and when the change speed is larger than a preset value, the fact that smoke oil in the electronic cigarette is exhausted is determined, and power supply for the heating wire is stopped.

3. The method of detecting depletion of smoke oil in an electronic cigarette according to claim 2, wherein said temperature sensor is a thermocouple temperature sensor connected to an end of said heating wire.

4. The method of detecting depletion of tobacco smoke in an electronic cigarette according to claim 1, wherein after step S2, the method further comprises the steps of:

5. An electronic cigarette applied to the method for detecting whether the tobacco tar in the electronic cigarette is exhausted according to claim 1, characterized by comprising the following steps: the detection control circuit is used for atomizing a heating wire of the tobacco tar and a power supply circuit for supplying power to the detection control circuit and the heating wire;

the detection control circuit is used for controlling the power supply circuit to supply power to the heating wire when a smoking signal is detected so as to enable the heating wire to work, acquiring the temperature change speed of the heating wire, determining that the smoke oil in the electronic cigarette is exhausted when the change speed is larger than a preset value, and stopping supplying power to the heating wire;

the detection control circuit includes: the voltage detection device comprises a microprocessor and a voltage detection sub-circuit connected with the microprocessor;

the microprocessor is also used for calculating the resistance change amplitude of the heating wire in preset time based on the voltage value, acquiring the temperature change speed of the heating wire based on the change amplitude, and determining that the smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value so as to stop supplying power to the heating wire; wherein the resistance of the heating wire changes along with the change of temperature;

the voltage detection point is a heating wire end, and the voltage detection sub-circuit comprises:

the voltage division module is connected with the microprocessor and the end part of the heating wire and used for converting the voltage value into readable voltage so that the microprocessor calculates the resistance change amplitude of the heating wire in preset time based on the readable voltage, obtains the temperature change speed of the heating wire based on the change amplitude, and determines that the smoke oil in the electronic cigarette is exhausted when the change speed is greater than a preset value so as to stop supplying power to the heating wire; wherein the readable voltage is a voltage that the microprocessor can recognize;

the detection control circuit further includes: a first switching element connected to the microprocessor; the microprocessor is used for controlling the first switch part to be switched on or switched off so as to control the power supply circuit to supply power to the heating wire or stop supplying power;

the voltage detection sub-circuit further comprises: a second switching element connected to the microprocessor; the microprocessor is used for controlling the second switch to be switched on or switched off so as to control the voltage detection sub-circuit to detect and acquire the voltage value or stop detecting the voltage value;

the first switch piece and the second switch piece are both field effect transistors;

6. The electronic cigarette of claim 5, wherein the detection control circuit comprises: the temperature detection device comprises a microprocessor and a temperature detection sub-circuit connected with the microprocessor;

7. The electronic cigarette of claim 5 or 6, further comprising: the alarm circuit is connected with the microprocessor;

8. The electronic cigarette of claim 7, wherein the alarm circuit is specifically configured to display output alarm information, the alarm circuit comprising: the display screen is connected with the microprocessor, and the awakening sub-circuit is connected with the microprocessor and the display screen;

9. The electronic cigarette of claim 5 or 6, wherein the power supply circuit has a functional module for charging an external device, the electronic cigarette further comprising a switch activation circuit connected to the microprocessor, comprising:

10. The electronic cigarette of claim 5 or 6, wherein the power supply circuit comprises: the charging management sub-circuit is connected with the charging interface, the charging management sub-circuit, the battery and the charging sub-circuit;