CN114668195A - Dry burning prevention control method and circuit and electronic cigarette - Google Patents

Dry burning prevention control method and circuit and electronic cigarette Download PDF

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Publication number
CN114668195A
CN114668195A CN202210366606.1A CN202210366606A CN114668195A CN 114668195 A CN114668195 A CN 114668195A CN 202210366606 A CN202210366606 A CN 202210366606A CN 114668195 A CN114668195 A CN 114668195A
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CN
China
Prior art keywords
heater
voltage
control unit
electronic cigarette
dry
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210366606.1A
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Chinese (zh)
Inventor
郭晋亮
赵启东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Toll Microelectronic Co ltd
Original Assignee
Tuoer Microelectronics Co ltd
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Filing date
Publication date
Application filed by Tuoer Microelectronics Co ltd filed Critical Tuoer Microelectronics Co ltd
Priority to CN202210366606.1A priority Critical patent/CN114668195A/en
Publication of CN114668195A publication Critical patent/CN114668195A/en
Pending legal-status Critical Current

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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
    • A24F40/57—Temperature control
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00—Smokers' requisites not otherwise provided for

Abstract

The application is suitable for the technical field of electronic cigarettes, and provides an anti-dry heating control method, an anti-dry heating control circuit and an electronic cigarette, wherein the anti-dry heating control method comprises the following steps: and timing the duration time of the electronic cigarette entering the standby mode, wherein the heater does not work when the electronic cigarette is in the standby mode. When the duration time reaches a first preset time, the heater is completely cooled, the temperature is reduced to normal temperature, and a first voltage of the target end of the heater is collected. When the electronic cigarette enters the working mode, the temperature of the heater rises at the moment, and the second voltage of the target end part of the heater is collected at the moment. When the absolute value of the difference value between the first voltage and the second voltage is larger than the preset value, the fact that the temperature of the heater is too high and the heater burns in a dry mode is indicated, the heater is controlled to stop working at the moment, and harmful substances generated by the heater burning in a dry mode are prevented from being sucked by a user and affecting the body health of the user.

Description

Dry burning prevention control method and circuit and electronic cigarette
Technical Field
The application belongs to the technical field of electronic cigarettes, and particularly relates to an anti-dry heating control method and circuit and an electronic cigarette.
Background
The discovery and use of tobacco has existed in the human society for centuries, and as people's health consciousness is improved and the ban on smoking is continuously promoted, more and more people gradually begin to give up smoking or find substitutes thereof, so that electronic cigarettes are produced and rapidly spread in the world.
When the electronic cigarette is used, the heater soaked in the tobacco tar heats the atomized tobacco tar to generate smoke for a user to suck, if the tobacco tar does not soak the heater, the heater can be burnt dry, harmful substances are generated, the health of a body is influenced, and potential safety hazards are caused.
Disclosure of Invention
The embodiment of the application provides an anti-dry heating control method, an anti-dry heating control circuit and an electronic cigarette, and can solve the problem of dry heating of a heater.
In a first aspect, an embodiment of the present application provides an anti-dry heating control method, including:
timing the duration of the electronic cigarette entering the standby mode;
when the duration time reaches a first preset time, collecting a first voltage at the target end of the heater;
when the electronic cigarette enters a working mode, collecting a second voltage at the target end part of the heater;
and when the absolute value of the difference value between the first voltage and the second voltage is greater than a preset value, controlling the heater to stop working.
In a possible implementation manner of the first aspect, the method further includes:
after the electronic cigarette is started, controlling the electronic cigarette to be locked in a standby mode, and collecting a first voltage at the target end of the heater;
and after the first voltage is collected, controlling the electronic cigarette to unlock the standby mode so that the electronic cigarette can enter a working mode.
In a possible implementation manner of the first aspect, the method further includes:
and when the heater is detected to be replaced, acquiring a first voltage of the target end part of the heater.
In a possible implementation manner of the first aspect, the method further includes:
and when the absolute value of the difference value between the second voltage and the first voltage is greater than a preset value, controlling an alarm to send alarm information.
In a second aspect, an embodiment of the present application provides an anti-dry heating control circuit, which includes a control unit, a temperature acquisition unit, a first switch unit, and a heater, where the first switch unit is connected in series between the heater and a first power supply, and the control unit is electrically connected to the temperature acquisition unit and the first switch unit respectively;
the temperature acquisition unit is used for acquiring the voltage of the target end part of the heater and transmitting the voltage to the control unit, the control unit is used for executing the method of any one of the first aspect, and the first switch unit is used for switching on or switching off according to a control instruction of the control unit.
In a possible implementation manner of the second aspect, the temperature acquisition unit includes a thermistor wire, a first current source, and a first switch tube, a first end of the thermistor wire is grounded, a second end of the thermistor wire is electrically connected to the control unit and a drain of the first switch tube, respectively, a source of the first switch tube is electrically connected to the first current source, and a gate of the first switch tube is electrically connected to the control unit;
the thermistor wire is used for collecting the voltage of the target end part of the heater and transmitting the voltage to the control unit.
In a possible implementation manner of the second aspect, the dry burning prevention control circuit further includes an alarm, the alarm is electrically connected with the control unit, and the alarm gives an alarm according to a control instruction of the control unit.
In a possible implementation manner of the second aspect, the dry-heating prevention control circuit further includes a load plugging detection unit, the load plugging detection unit is electrically connected to the control unit, and the load plugging detection unit is configured to detect in-place information of the heater and transmit the in-place information to the control unit.
In a possible implementation manner of the second aspect, the first switch unit includes a second switch tube, a drain of the second switch tube is electrically connected to the heater, a source of the second switch tube is electrically connected to the first power supply, and a gate of the second switch tube is electrically connected to the control unit.
In a third aspect, an embodiment of the present application provides an electronic cigarette, including the dry burning prevention control circuit described in any one of the second aspects.
Compared with the prior art, the embodiment of the application has the advantages that:
and timing the duration time of the electronic cigarette entering the standby mode, wherein the heater does not work when the electronic cigarette is in the standby mode. When the duration time reaches a first preset time, the heater is completely cooled, the temperature is reduced to normal temperature, and a first voltage of the target end of the heater is collected. When the electronic cigarette enters the working mode, the temperature of the heater is increased, and the second voltage of the target end of the heater is collected. When the absolute value of the difference value of the first voltage and the second voltage is larger than the preset value, the fact that the temperature of the heater is too high and the heater burns dry is indicated, the heater is controlled to stop working at the moment, and harmful substances generated by dry burning of the heater are prevented from being sucked by a user and affecting the body health of the user.
It is to be understood that, the beneficial effects of the second aspect and the third aspect may refer to the relevant description in the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a dry burning prevention control method according to an embodiment of the present application;
fig. 2 is a schematic block diagram of an anti-dry heating control circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic connection diagram of an anti-dry heating control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic connection diagram of a temperature acquisition unit according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when …" or "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Fig. 1 shows a schematic flow chart of an anti-dry heating control method provided in an embodiment of the present application. Referring to fig. 1, the dry burning prevention control method includes steps S101 to S104.
Step S101 is to count the duration of the electronic cigarette entering the standby mode.
Specifically, after the electron cigarette starts, the electron cigarette has two mode: a standby mode and an operating mode. When the electronic cigarette is in the standby mode, the heater does not work, and the user can not smoke at the moment. When the electronic cigarette is in a working state, the heater heats the atomized tobacco tar to generate smoke, and a user can suck the smoke. When the electronic cigarette is switched from the working mode to the standby mode, the control unit starts to time the duration of the electronic cigarette in the standby mode.
And S102, when the duration time reaches a first preset time, acquiring a first voltage of the target end part of the heater.
Specifically, when the electronic cigarette is in the standby mode, the heater is always in the non-operating state, and the temperature of the heater is gradually reduced. When the duration reaches a first preset time, the temperature of the heater is reduced to a minimum temperature, typically 25 ℃. At this time, a first voltage at the target end of the heater is collected as a reference voltage.
The designer may set the specific value of the first preset time according to actual conditions, for example, the first time is set to 3 minutes, 5 minutes, or 7 minutes.
And step S103, collecting a second voltage of the target end of the heater when the electronic cigarette enters the working mode.
Specifically, when the electronic cigarette enters the working mode, the second voltage at the target end of the heater is collected.
And step S104, controlling the heater to stop working when the absolute value of the difference value between the first voltage and the second voltage is larger than a preset value.
Specifically, when the absolute value of the difference between the first voltage and the second voltage is greater than the preset value, it is indicated that the difference between the first voltage and the second voltage is too large, the resistance value of the heater is too large, the temperature of the heater is too large, that is, the temperature of the heater is too high, and it is determined that the heater is in a dry burning state at the moment. When the heater is judged to be dry-burned, the heater is controlled to stop working, and the situation that the heater is continuously dry-burned to generate harmful substances to cause harm to the health of a user is prevented.
It should be noted that, the designer can set the specific value of the preset value according to the actual situation.
In an embodiment of the present application, the dry burning prevention control method further includes step S105 and step S106.
Step S105, after the electronic cigarette is started, the electronic cigarette is controlled to be locked in a standby mode, and first voltage of the target end of the heater is collected.
Specifically, the electronic cigarette enters a standby mode when the electronic cigarette is started, and if the duration of the standby mode of the electronic cigarette does not reach the first preset time, the user starts to suck the electronic cigarette, the first voltage serving as the reference voltage cannot be obtained at this time, so that the second voltage has no reference voltage, and the dry burning prevention control cannot be performed.
In order to solve the problems, after the electronic cigarette is started, the electronic cigarette is locked in a standby mode, the electronic cigarette cannot enter a working mode, and a user cannot suck the electronic cigarette. At this time, the first voltage at the target end of the heater is collected as a reference voltage.
And S106, after the first voltage is collected, controlling the electronic cigarette to unlock the standby mode so that the electronic cigarette can enter the working mode.
Specifically, after the first voltage is collected, the electronic cigarette is controlled to unlock the standby mode, and at the moment, the electronic cigarette can be switched between the standby mode and the working mode.
In one embodiment of the present application, a first voltage is collected at a target tip of a heater when it is detected that the heater is replaced.
Specifically, after the heater was changed to the electron cigarette, gather the first voltage of heater target tip as reference voltage, realize having avoided because there is the deviation in the resistance value between the different heaters to the design reference voltage of every heater pertinence, cause to prevent the inaccurate phenomenon of dry combustion monitoring.
In one embodiment of the application, when the absolute value of the difference value between the second voltage and the first voltage is larger than a preset value, the alarm is controlled to send alarm information.
Specifically, when the absolute value of the difference value between the second voltage and the first voltage is larger than the preset value, the heater is dry-burned, the heater with the high temperature still can generate harmful substances after the heater is controlled to stop working, and if a user continues to suck the heater and still can suck the harmful substances, the alarm is controlled to send alarm information, so that the user is prompted to stop sucking the heater, and the user is prevented from sucking the harmful substances.
Fig. 2 shows a schematic block diagram of an anti-dry heating control circuit according to an embodiment of the present application. Referring to fig. 2, the dry-heating prevention control circuit includes a control unit 21, a temperature acquisition unit 22, a first switch unit 23 and a heater 24, the first switch unit 23 is connected in series between the heater 24 and a first power supply 25, and the control unit 21 is electrically connected with the temperature acquisition unit 22 and the first switch unit 23 respectively.
Specifically, the temperature collecting unit 22 is used for collecting the voltage of the target end of the heater 24 and transmitting the voltage to the control unit 21. When the duration that the electronic cigarette is in the standby mode reaches a first preset time, the temperature acquisition unit 22 acquires a first voltage at the target end of the heater 24. When the electronic cigarette is in the working mode, the temperature acquisition unit 22 acquires a second voltage at the target end of the heater 24.
When the electronic cigarette is in the working mode, the control unit 21 compares the first voltage with the second voltage, when the absolute value of the difference value of the first voltage and the second voltage is greater than the preset value, the heater 24 at the moment is judged to be in a dry-burning state, the control unit 21 controls the first switch unit 23 to be disconnected at the moment, the heater 24 is disconnected with the first power supply 25, the heater 24 stops working, and the heater 24 is prevented from continuously burning to generate harmful substances to cause harm to the health of a user.
When the absolute value of the difference between the first voltage and the second voltage is smaller than the preset value, it indicates that the heater 24 is normally heated, and at this time, the control unit 21 controls the first switch unit 23 to be turned on, and the heater 24 heats the atomized tobacco tar to generate smoke for a user to inhale.
It should be noted that the control unit 21 in this application includes a controller, a signal acquisition circuit, and a signal processing circuit. Wherein the signal acquisition circuit is capable of acquiring a voltage signal, for example, a voltage signal output by the temperature acquisition unit 22. The signal processing circuit is used for processing the signals output by the signal acquisition circuit, and the processing modes comprise signal filtering, signal scaling and the like. The controller is used for analyzing the signals and outputting corresponding control signals according to the analysis results.
As shown in fig. 3, the temperature collecting unit 22 includes a thermistor Rt, a first current source ID1, and a first switch tube M1, a first end of the thermistor Rt is grounded, a second end of the thermistor Rt is electrically connected to the control unit 21 and the drain of the first switch tube M1, respectively, a source of the first switch tube M1 is electrically connected to the first current source ID1, and a gate of the first switch tube M1 is electrically connected to the control unit 21.
Specifically, the first current source ID1 is configured to provide a first current to the thermistor wire Rt, where the first current is a fixed current, and a designer may select the first current source ID1 according to actual needs to determine the first current.
Preferably, the thermistor wire Rt is wound around the heater 24, so that the thermistor wire Rt is in good contact with the heater 24, thereby achieving heat transfer. When the heater 24 generates heat, the temperature of the thermistor Rt and the temperature of the heater 24 are kept the same by heat transfer therebetween, thereby realizing accurate measurement of the temperature of the heater 24 by the thermistor Rt.
The control unit 21 controls the temperature acquisition unit 22 by controlling the on/off of the first switching tube M1. When the control unit 21 controls the first switch tube M1 to be conducted, the first current source ID1, the first switch tube M1 and the thermistor wire Rt form a series circuit. The working current of the thermistor Rt is a fixed value (the first current provided by the first current source ID 1), the temperature of the thermistor Rt changes along with the temperature change of the heater 24, and when the thermistor Rt changes, the resistance of the thermistor Rt changes along with the change, so that the voltage at the second end of the thermistor Rt changes. Therefore, the collected voltage output by the second end of the thermistor wire Rt can reflect the current temperature of the heater 24, and the temperature of the heater 24 can be detected.
When the control unit 21 controls the first switching tube M1 to be disconnected, the thermistor Rt and the first current source ID1 are disconnected, and the voltage output by the second end of the thermistor Rt is zero.
In an embodiment of the present application, the dry burning prevention control circuit further includes an alarm, the alarm is electrically connected to the control unit 21, and the alarm gives an alarm according to a control instruction of the control unit 21.
Specifically, when the heater 24 is dry-burned, the control unit 21 controls the heater 24 to stop working, and the high-temperature heater 24 still generates harmful substances, and the user still sucks the harmful substances if the user continues to suck the heater. At this time, the control unit 21 controls the alarm to send alarm information to prompt the user to stop sucking so as to prevent the user from sucking harmful substances.
As shown in fig. 3, the dry-heating prevention control circuit further includes a load plugging detection unit electrically connected to the control unit 21, and the load plugging detection unit is configured to detect the in-place information of the heater 24 and transmit the in-place information to the control unit 21.
Specifically, the load plugging/unplugging detection unit is configured to detect presence information of the heater 24 and transmit the presence information to the control unit 21, so as to complete detection of replacement of the heater 24.
For example, when the heater 24 is mounted on the electronic cigarette, the load insertion and extraction detecting unit outputs a high level signal. When the heater 24 is detached, the load plugging detection unit outputs a low level signal. The control unit 21 can know the presence information of the heater 24 by recognizing the level of the output signal of the load insertion/extraction detecting unit.
In one embodiment of the present application, the first switching unit 23 includes a second switching tube M2, a drain of the second switching tube M2 is electrically connected to the heater 24, a source of the second switching tube M2 is electrically connected to the first power supply 25, and a gate of the second switching tube M2 is electrically connected to the control unit 21.
Specifically, the control unit 21 controls the heater 24 by controlling the on/off of the second switching tube M2. When the control unit 21 controls the second switch tube M2 to be turned on, the heater 24 heats the atomized tobacco tar to generate smoke for the user to suck; when the control unit 21 controls the second switching tube M2 to be turned off, the heater 24 stops operating.
The control unit 21 can output a PWM signal to control the heater 24, and adjust the duty ratio and frequency of the PWM signal to control the power of the heater 24.
In order to clearly illustrate the operation principle of the anti-dry heating control circuit, a specific embodiment is described below.
Example one
As shown in fig. 3, the insertion/extraction detecting unit 26 can collect the in-place information of the heater Rload and send the in-place information to the control unit 21. The control unit 21 can recognize whether the heater Rload is replaced or not based on the presence information.
After the electronic cigarette is started, the control unit 21 controls the electronic cigarette to be locked in a standby mode, at the moment, the control unit 21 controls the first switch tube M1 and the second switch tube M2 to be conducted for a short time, and the thermistor wire Rt outputs a first voltage according to the current temperature value of the heater Rload.
After the test of the first voltage is completed, the control unit 21 unlocks the standby mode, and at this time, the electronic cigarette can enter the working mode. When the electronic cigarette is in the working mode, the control unit 21 controls the second switch tube M2 to be turned on for a long time, or controls the second switch tube M2 to be turned on and off rapidly, so as to control the heater Rload to heat the atomized tobacco tar to generate smoke for the user to inhale. Meanwhile, the control unit 21 controls the first switching tube M1 to be conducted, and the thermistor Rt outputs a second voltage according to the current temperature of the heater Rload.
The control unit 21 compares the first voltage and the second voltage, when the absolute value of the difference between the first voltage and the second voltage is greater than the preset value, the control unit 21 determines that the heater Rload is in a dry-fire state, and at this time, the control unit 21 controls the second switching tube M2 to be turned off, so that the heater Rload stops working. Therefore, the temperature of the heater Rload can be monitored, when the heater Rload is burnt dry, the heater Rload is controlled to stop working, and the situation that harmful substances are generated due to continuous burning of the heater Rload and the health of a user is hurt is prevented.
Example two
As shown in fig. 4, in this embodiment, the temperature acquisition unit includes a second current source ID2, an inverter Y1, and a third switching tube M3, the inverter Y1 is connected in series between the gate of the second switching tube M2 and the gate of the third switching tube M3, the drain of the third switching tube M3 is electrically connected to the heater Rload, and the source of the third switching tube M3 is electrically connected to the second current source ID 2.
The second current source ID2 is used to provide a second current, wherein the second current is a fixed current, and the designer can type the second current source ID2 according to actual requirements to determine the second current.
The control unit 21 controls the second switching tube M2 and the third switching tube M3 to be turned on or off, and when the second switching tube M2 is turned on, the third switching tube M3 is turned off; when the second switching tube M2 is turned off, the third switching tube M3 is turned on.
When the control unit 21 controls the second switch tube M2 to be turned on, the third switch tube M3 is turned off, and at this time, the heater Rload heats the atomized tobacco tar to generate smoke for a user to inhale. When the control unit 21 controls the second switching tube M2 to be turned off, the third switching tube M3 is turned on, and the current of the heater Rload is the second current. Because the resistance value of the heater Rload changes along with the change of the temperature, the voltage of the second end of the heater Rload can reflect the current temperature information of the heater Rload, and therefore the temperature of the heater Rload is collected.
When the electronic cigarette is turned on or the duration time of the electronic cigarette in the standby mode is longer than the first preset time, the control unit 21 controls the second switching tube M2 to be turned off, the third switching tube M3 is turned on, and at this time, the control unit 21 can acquire the current first voltage of the heater Rload.
When the control unit 21 controls the heater Rload to operate, the control signal output by the control unit 21 is a PWM signal, the second switching tube M2 and the third switching tube M3 switch on and off according to the PWM signal, when the third switching tube M3 is turned on, the second current source ID2 and the heater Rload are turned on, and at this time, the voltage at the second end of the heater Rload is the second voltage.
The control unit 21 compares the first voltage and the second voltage, when the absolute value of the difference between the first voltage and the second voltage is greater than the preset value, the control unit 21 determines that the heater Rload is in a dry-fire state, and at this time, the control unit 21 controls the second switching tube M2 to be turned off, so that the heater Rload stops working. Therefore, the temperature of the heater Rload can be monitored, when the heater Rload is burnt dry, the heater Rload is controlled to stop working, and the situation that harmful substances are generated due to continuous burning of the heater Rload and the health of a user is hurt is prevented.
The application also discloses an electronic cigarette, including foretell dry combustion method control circuit. The control unit in the electron cigarette can monitor the operating condition of heater, and when the heater dry combustion method appeared, the stop work of control unit control heater prevented that the heater from lasting dry combustion method from producing harmful substance, caused the injury to the user.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A dry burning prevention control method is characterized by comprising the following steps:
timing the duration of the electronic cigarette entering the standby mode;
when the duration time reaches a first preset time, acquiring a first voltage of a target end part of the heater;
when the electronic cigarette enters a working mode, collecting a second voltage at the target end part of the heater;
and when the absolute value of the difference value between the first voltage and the second voltage is greater than a preset value, controlling the heater to stop working.
2. The dry-fire prevention control method according to claim 1, further comprising:
after the electronic cigarette is started, controlling the electronic cigarette to be locked in a standby mode, and collecting a first voltage at the target end of the heater;
and after the first voltage is collected, controlling the electronic cigarette to unlock the standby mode so that the electronic cigarette can enter a working mode.
3. The dry-fire prevention control method according to claim 1, further comprising:
and when the heater is detected to be replaced, acquiring a first voltage of the target end part of the heater.
4. The dry-fire prevention control method according to claim 1, further comprising:
and when the absolute value of the difference value between the second voltage and the first voltage is greater than a preset value, controlling an alarm to send alarm information.
5. The dry-burning prevention control circuit is characterized by comprising a control unit, a temperature acquisition unit, a first switch unit and a heater, wherein the first switch unit is connected between the heater and a first power supply in series;
the temperature acquisition unit is used for acquiring the voltage of the target end part of the heater and transmitting the voltage to the control unit, the control unit is used for executing the method of any one of claims 1-4, and the first switch unit is used for switching on or switching off according to a control instruction of the control unit.
6. The anti-dry heating control circuit according to claim 5, wherein the temperature acquisition unit comprises a thermistor wire, a first current source and a first switch tube, a first end of the thermistor wire is grounded, a second end of the thermistor wire is respectively and electrically connected with the control unit and a drain electrode of the first switch tube, a source electrode of the first switch tube is electrically connected with the first current source, and a gate electrode of the first switch tube is electrically connected with the control unit;
the thermistor wire is used for collecting the voltage of the target end part of the heater and transmitting the voltage to the control unit.
7. The anti-dry heating control circuit according to claim 5, further comprising an alarm electrically connected to the control unit, wherein the alarm gives an alarm according to a control command of the control unit.
8. The dry burning prevention control circuit according to claim 5, further comprising a load plugging detection unit electrically connected to the control unit, the load plugging detection unit being configured to detect in-place information of the heater and transmit the in-place information to the control unit.
9. The anti-dry heating control circuit of claim 5, wherein the first switch unit comprises a second switch tube, a drain of the second switch tube is electrically connected to the heater, a source of the second switch tube is electrically connected to the first power supply, and a gate of the second switch tube is electrically connected to the control unit.
10. An electronic cigarette, comprising the dry-fire prevention control circuit according to any one of claims 5 to 9.
CN202210366606.1A 2022-04-08 2022-04-08 Dry burning prevention control method and circuit and electronic cigarette Pending CN114668195A (en)

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