Anti-dry-burning electronic cigarette

Abstract

The utility model discloses an anti-dry-burning electronic cigarette which comprises a battery assembly and an atomizer, the atomizer comprises a heating resistor, the battery assembly comprises a battery, a power adjusting unit, a microprocessor, a starting switch, a sampling reference resistor and a resistance value detection unit which are electrically connected, and the anti-dry-burning electronic cigarette further comprises a tobacco juice remaining amount detection unit and a tobacco juice data storage module. The resistance value detection unit can detect the resistance value of the heating resistor in real time and transmit the resistance value to the microprocessor, and the tobacco juice remaining amount detection unit is used for detecting the tobacco juice remaining amount real-time value L in the atomizer in real time and transmitting the tobacco juice remaining amount real-time value L to the microprocessor. The tobacco juice data storage module can be used for storing the real-time resistance value R detected in real time, the tobacco juice remaining amount real-time value L and some initially set threshold values and data. The method has the beneficial effects that the configuration of the electronic cigarette can accurately analyze and judge whether the electronic cigarette reaches the dry burning state or the temporary dry burning state, so that a user is prevented from inhaling the smog of the electronic cigarette with scorched smell, and the good use experience of the user is improved.

Description

Technical Field

[0001] This utility model relates to the field of anti-dry-burning technology for electronic cigarettes, and more specifically, this utility model relates to an anti-dry-burning electronic cigarette. Background Technology

[0002] Electronic cigarettes generally consist of two parts: a battery assembly and an atomizer. The atomizer includes an atomizing device. When a heating resistor in the atomizing device is energized, it generates heat. The e-cigarette liquid in contact with the heating resistor is heated and atomized to form vapor. The vapor flows through the vapor channel in the atomizer into the mouthpiece for the user to inhale.

[0003] In actual use, e-cigarettes may experience issues such as running out of e-liquid or the e-liquid not making good contact with the heating resistor, resulting in the heating resistor being "dry-burning" without any e-liquid around it. This can easily damage the e-cigarette, and when dry-burning occurs, the e-cigarette vapor inhaled by the user has a burnt smell, creating a poor user experience.

[0004] Existing electronic cigarettes generally determine whether they are in a "dry-burning" state by directly detecting the e-liquid content or the resistance value (i.e., the operating temperature) of a heating resistor, and then trigger a power-off protection mechanism. Current dry-burning protection methods typically involve detecting the absolute resistance value of the heating resistor and determining when the resistance reaches a dry-burning protection threshold. Alternatively, they may determine when the rate of change of resistance over a certain time reaches a dry-burning protection threshold, triggering the same protection mechanism.

[0005] When directly detecting the e-liquid content, the e-liquid level is constantly changing due to the shaking of the atomizer, making accurate detection difficult. Directly detecting the operating temperature of the heating resistor may also cause it to briefly dry-burn due to a lack of e-liquid in contact with the resistor while it is heating. Therefore, these methods can lead to inaccurate dry-burn detection and trigger dry-burn protection, making it impossible to continue using the e-cigarette even if there is still e-liquid. There is also no circuit that can accurately, in real time, and conveniently detect and protect against actual dry-burning of the atomizer. Utility Model Content

[0006] This invention provides an electronic cigarette that prevents dry burning in order to overcome the above-mentioned technical deficiencies.

[0007] The technical solution of this utility model is implemented as follows: An anti-dry-burning electronic cigarette includes a battery assembly and an atomizer. The atomizer includes a heating resistor. The battery assembly includes an electrically connected battery, a power adjustment unit, a microprocessor, a start switch, a sampling reference resistor, and a resistance detection unit. The atomizer or battery assembly also includes an e-liquid remaining quantity detection unit and an e-liquid data storage module. The e-liquid remaining quantity detection unit, e-liquid data storage module, resistance detection unit, power adjustment unit, and start switch are respectively communicatively connected to the microprocessor. When the start switch is turned on or off, the microprocessor controls the power adjustment unit to output power to the heating resistor or turn off the output. The resistance detection unit is used to detect the real-time resistance value R of the heating resistor and transmit it to the microprocessor. The e-liquid remaining quantity detection unit is used for... The microprocessor detects the real-time e-liquid level L in the atomizer and transmits it to the microprocessor. The e-liquid data storage module stores the real-time resistance R, the real-time e-liquid level L, and some initially set thresholds and data. The microprocessor is configured to set the real-time resistance R detected when the user takes a puff from the moment the power switch is turned on until the heating resistor is energized, or the real-time resistance R detected each time the atomizer is plugged into the battery assembly, as the initial resistance R0. When the microprocessor reads and determines that the real-time e-liquid level L is less than or equal to the e-liquid level threshold L1, and reads and determines that the resistance change R-R0 of the real-time resistance R relative to the initial resistance R0 during each puff is greater than or equal to the first resistance increase threshold R1, it controls the power adjustment unit to immediately shut off the output and prevent it from supplying power to the heating resistor again to prevent dry burning.

[0008] Preferably, the microprocessor includes a liquid information calculation module, a dry burning judgment module, and a resistance change judgment module.

[0009] Preferably, the microprocessor is further configured to: read and determine that the real-time value of the remaining e-liquid is greater than the remaining e-liquid threshold L1, and read and determine that the resistance change amplitude value R-R0 is greater than or equal to the second resistance increase threshold R2, wherein the second resistance increase threshold R2 is greater than the first resistance increase threshold R1, and the microprocessor determines that the heating resistor may be dry-burning and controls the power regulation unit to temporarily shut off the output.

[0010] Preferably, when the real-time resistance value R detected by the user during each inhalation from when the start switch is turned on to when the heating resistor is energized is set as the initial resistance value R0, the battery assembly also includes a timer that is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to calculate the time interval t between the end of the previous inhalation and the start of the current inhalation. The microprocessor is also configured to determine that when the time interval t is less than or equal to the time interval threshold t1, the microprocessor calculates the initial resistance value R0 of the current inhalation according to the initial resistance value R0 of the previous inhalation.

[0011] Preferably, the remaining e-liquid detection unit is configured as a timer, which is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to accumulate the working time Ta of the start switch, i.e., the heating resistor, and send it to the microprocessor. The power adjustment unit is configured to output constant power. The microprocessor is further configured to: replace the total e-liquid value L0 with the total time when the e-liquid can be sucked, i.e., the total working time T0 of the heating resistor; replace the real-time value L of the remaining e-liquid with the real-time value T of the remaining working time of the heating resistor; replace the remaining e-liquid threshold L1 with the remaining time threshold T1; and replace the microprocessor's analysis and judgment of L≤L1 with analysis and judgment of T≤T1.

[0012] Preferably, the remaining e-liquid detection unit is configured as a timer, which is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to accumulate the working time Ta of the start switch, i.e., the heating resistor, and send it to the microprocessor. The power adjustment unit is configured to output constant power. The microprocessor is further configured to: replace the total e-liquid value L0 with the total time when the e-liquid can be sucked, i.e., the total working time T0 of the heating resistor; replace the real-time value L of the remaining e-liquid with the real-time value T of the remaining working time of the heating resistor; replace the remaining e-liquid threshold L1 with the remaining time threshold T1; replace the microprocessor's analysis and judgment of L≤L1 with analysis and judgment of T≤T1; and replace the microprocessor's analysis and judgment of L>L1 with analysis and judgment of T>T1.

[0013] Preferably, the configuration of the resistance detection unit and the microprocessor further includes: when the user takes a breath, the real-time resistance R detected by the resistance detection unit before the heating resistor is energized is a plurality of real-time resistance values ​​R, and the microprocessor takes the lowest value among the plurality of real-time resistance values ​​R as the initial resistance value R0.

[0014] Preferably, the configuration of the resistance detection unit and the microprocessor further includes: when the user takes a puff, the real-time resistance R detected by the resistance detection unit before the heating resistor is energized is a plurality of real-time resistance values ​​R, and the microprocessor takes the average value of the plurality of real-time resistance values ​​R and sets the average value as the initial resistance value R0.

[0015] Preferably, the configuration of the resistance detection unit and the microprocessor further includes: when the user takes a puff, the real-time resistance R detected by the resistance detection unit before the heating resistor is energized is a plurality of real-time resistance values ​​R, and the microprocessor takes the first or last value of the plurality of real-time resistance values ​​R as the initial resistance value R0.

[0016] Preferably, the atomizer further includes an anti-counterfeiting chip that is communicatively connected to the microprocessor, the e-liquid data storage module is disposed within the anti-counterfeiting chip, the anti-counterfeiting chip further includes an anti-counterfeiting data storage module, and the anti-counterfeiting data storage module is configured to identify whether the atomizer is a genuine atomizer.

[0017] Preferably, the microprocessor is further configured to read the anti-counterfeiting data storage module and, if it determines that the anti-counterfeiting data does not match the genuine anti-counterfeiting data, control the power regulator to shut off the output and prevent it from supplying power to the heating resistor of the atomizer again.

[0018] Preferably, the microprocessor includes a data anti-counterfeiting processing module, a liquid information calculation module, a dry burning judgment module, and a resistance change judgment module.

[0019] Preferably, the anti-counterfeiting chip further includes a data backup module and a data read / write processing module.

[0020] The beneficial effects of this invention for preventing dry burning of electronic cigarettes are as follows: This invention is equipped with a liquid level detection unit and a resistance detection unit, and is configured to simultaneously detect the liquid level of the electronic cigarette and the resistance change value during each puff. It can accurately analyze and determine whether the electronic cigarette has reached a dry burning state or a temporary dry burning state, thereby providing permanent dry burning protection and temporary dry burning protection respectively, preventing users from inhaling electronic cigarette smoke with a burnt smell, and improving the user's good user experience. Attached Figure Description

[0021] Figure 1 This utility model provides a frame for an electronic cigarette designed to prevent dry burning. Figure 1 ;

[0022] Figure 2 This utility model provides a frame for an electronic cigarette designed to prevent dry burning. Figure 2 ;

[0023] Figure 3 This utility model provides a frame for an electronic cigarette designed to prevent dry burning. Figure 3 ;

[0024] Figure 4 This is a schematic diagram showing the resistance change of the heating resistor during operation of the anti-dry-burning electronic cigarette of this utility model;

[0025] Figure 5 This is a schematic diagram showing another resistance change of the heating resistor during the operation of the anti-dry-burning electronic cigarette of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0027] This invention relates to an electronic cigarette, comprising a battery assembly and an atomizer. The battery assembly provides power to the atomizer, which includes a reservoir for storing e-liquid and a heating resistor for heating the atomized e-liquid. The battery assembly and the atomizer can be detachably or non-detachably connected. In the detachable connection, the atomizer can be replaced after its e-liquid is consumed, and the battery assembly can be reused multiple times. In the non-detachable connection, the atomizer and battery assembly are fixedly connected, and the atomizer cannot be replaced after its e-liquid is consumed; thus, this is a disposable electronic cigarette. The electronic cigarette includes a battery assembly and an atomizer, and its circuitry consists of electronic components and electronic lines, leads, and electrodes connecting these components.

[0028] The meanings of the letters and symbols used in this utility model are as follows:

[0029] L0 = Total e-liquid volume, L1 = E-liquid remaining threshold, L = Real-time e-liquid remaining volume;

[0030] T0 = ​​Total working time of the heating resistor, T1 = Time margin threshold, Ta = Working time of the heating resistor, T = Real-time value of the working time margin of the heating resistor.

[0031] t0 = the time point when the atomizer is plugged into the battery pack each time, t1 = time interval threshold, t = the time interval between the end of the previous inhalation and the start of the current inhalation;

[0032] R0 = initial resistance value, R1 = first threshold for resistance increase, R2 = second threshold for resistance increase, R = real-time resistance value.

[0033] Example 1

[0034] like Figure 1As shown in one embodiment, the present invention provides an anti-dry-burning electronic cigarette, comprising a battery assembly and an atomizer. The atomizer includes a heating resistor. The battery assembly includes a battery, a power regulation unit, a microprocessor, a start switch, a sampling reference resistor, and a resistance detection unit, all electrically connected. The atomizer also includes a liquid level detection unit, and the battery assembly further includes a liquid data storage module. The liquid level detection unit, liquid data storage module, resistance detection unit, power regulation unit, and start switch are all communicatively connected to the microprocessor. When the start switch is on, the microprocessor controls the power regulation unit to output power to the heating resistor, the electronic cigarette operates, and the user inhales vapor. When the start switch is off, the microprocessor controls the power regulation unit to turn off the output to the heating resistor, the electronic cigarette enters standby mode, and the user stops smoking. The resistance detection unit is used to detect the real-time resistance R of the heating resistor and transmit it to the microprocessor. The resistance detection unit sets the real-time resistance R detected by the user during each puff from when the start switch is on until the heating resistor is energized as the initial resistance value R0. Because the initial resistance R0 changes with each puff as the temperature of the heating resistor rises, the resistance variation R-R0 also changes with each puff. If R0 remains constant, the resistance variation R-R0 cannot accurately reflect the actual resistance change during each puff, potentially leading to a false positive for dry burning. Therefore, setting the real-time resistance detected at the start of each puff as the initial resistance R0 accurately reflects whether dry burning has actually occurred. The e-liquid level detection unit detects the real-time e-liquid level L in the atomizer and transmits it to the microprocessor. The e-liquid data storage module stores the real-time resistance R, the real-time e-liquid level L, and some initially set thresholds and data. The microprocessor is configured to read and determine if the real-time e-liquid level L is less than or equal to the e-liquid level threshold L1, and if the real-time resistance R detected by the user during each puff (from when the heating resistor is powered on to when it is powered off) is greater than or equal to the first resistance increase threshold R1. This indicates that the e-liquid in the atomizer is nearly insufficient, and the resistance change during each puff has exceeded the set value. Therefore, the microprocessor determines that the heating resistor has actually dry-burned and controls the power regulation unit to shut off its output, preventing it from supplying power to the heating resistor again. This accurately determines that the e-liquid in the atomizer is close to the minimum level and avoids continuing to power an atomizer that is close to having no e-liquid, thus preventing the user from inhaling burnt smoke and causing a poor user experience.

[0035] Simultaneously, the microprocessor is configured to read and determine when the real-time e-liquid level L is greater than the e-liquid level threshold L1, and when the resistance change amplitude R-R0 is greater than or equal to the second resistance increase threshold R2. This indicates that the e-liquid in the atomizer is still sufficient, but due to the atomizer's placement angle, the supply of e-liquid is untimely or insufficient, causing a temporary lack of e-liquid around the heating resistor, resulting in brief dry burning. Therefore, the microprocessor determines that the heating resistor may be temporarily dry burning and controls the power regulation unit to temporarily shut off the output, causing the heating resistor to stop working. If the supply of e-liquid around the heating resistor can be quickly restored, and the user continues to inhale, and the resistance change amplitude R-R0 is detected to be less than the second resistance increase threshold R2, the microprocessor controls the power regulation unit to restore power to the heating resistor, allowing the e-cigarette to continue working. In this situation, the microprocessor can accurately determine the temporary dry burning of the heating resistor and perform temporary dry burning protection, thus preventing the user from inhaling burnt smoke and causing a poor user experience.

[0036] In this embodiment, the total amount of e-liquid can be set to L0=10ml, the remaining amount of e-liquid during dry burning can be set to L1=0.1ml, the resistance increase of the heating resistor that causes dry burning during each puff can be set to R1=0.12Ω, and the resistance increase of the heating resistor that may cause dry burning during each puff can be set to R2=0.17Ω.

[0037] In this embodiment, the value range of L1 can be set to (0.5%-2%)L0, the value range of R1 can be set to 0.05Ω-0.9Ω, and the value range of R2 can be set to 0.09Ω-1.0Ω. Furthermore, the value range of L0 can be set to (1-10)ml.

[0038] In this embodiment, the start switch is an airflow sensor. In other embodiments, the start switch can also be a manual button switch, a microphone, or a pressure sensor. When the airflow sensor detects airflow or negative pressure generated in the air path of the electronic cigarette due to the user's smoking, it can trigger the microprocessor to connect the power supply to the heating resistor.

[0039] In this embodiment, the microprocessor includes a liquid information calculation module, a dry burning judgment module, and a resistance change judgment module. These modules are part of an integrated circuit element with specific functions.

[0040] The electronic cigarette in this embodiment is equipped with both a liquid level detection unit and a resistance detection unit. It is configured to simultaneously detect the liquid level of the electronic cigarette and the resistance change during each puff. This allows for precise differentiation between whether the electronic cigarette has reached a dry-burning state or a temporary dry-burning state, thereby providing permanent dry-burning protection and temporary dry-burning protection respectively. This prevents users from inhaling burnt-smelling electronic cigarette smoke and enhances the user's experience.

[0041] like Figure 4 As shown, on the T time axis, t11-t13, t21-t23, and t31-t33 represent the suction time for each inlet. The time points t11, t21, and t31 are the times when the start switch is turned on, t12, t22, and t32 are the times when the heating resistor is energized, and t13, t23, and t33 are the times when the heating resistor is de-energized.

[0042] In this embodiment of the electronic cigarette, the configuration of the resistance detection unit and the microprocessor further includes: when the resistance detection unit detects multiple real-time resistance values ​​R during each puff of the user's cigarette, from the time the power switch is turned on until the heating resistor is energized, the microprocessor selects the lowest value among these multiple real-time resistance values ​​R and sets it as the initial resistance value R0. In other embodiments, the microprocessor may also take the average value of the multiple real-time resistance values ​​R and set the average value as the initial resistance value R0, or select the first or last value among the multiple real-time resistance values ​​R and set it as the initial resistance value R0.

[0043] In this embodiment of the electronic cigarette, the battery assembly also includes a timer that is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to calculate the time interval t between the end of the previous puff and the start of the current puff. The microprocessor is also configured to determine that when the time interval t is less than or equal to the time interval threshold t1, the microprocessor calculates the initial resistance value R0 of the current puff according to the initial resistance value R0 of the previous puff.

[0044] In other embodiments, the resistance detection unit can be configured such that the real-time resistance R detected each time the atomizer is plugged into the battery assembly is set as the initial resistance R0. In this case, such as Figure 5 As shown, T is the time axis, and R is the resistance axis of the heating resistor. t0 is the point in time when the atomizer of the electronic cigarette is plugged into the battery assembly. At this point, the initial resistance value R0 is detected. During subsequent inhalations, the atomizer is not plugged in or unplugged, so the initial resistance value R0 is no longer detected. t11-t12, t21-t22, and t31-t32 represent the inhalation time for each puff. t11, t21, and t31 are the times when the power switch is turned on or the heating resistor is energized, while t12, t22, and t32 are the times when the power switch is turned off or the heating resistor is de-energized. This method only requires detecting and setting the initial resistance value R0 once, eliminating the need to detect it every time an inhalation occurs, thus improving efficiency. This method is suitable when the initial resistance value R0 does not change significantly with each inhalation, meaning the initial resistance value R0 of the heating resistor is relatively stable.

[0045] Example 2

[0046] like Figure 2As shown, based on Embodiment 1, this embodiment of an anti-dry-burning electronic cigarette replaces the e-liquid remaining detection unit with a timer. The timer is located in the battery assembly and is communicatively connected to the start switch and the microprocessor. The timer is configured to accumulate the working time Ta of the start switch, i.e., the heating resistor, and send it to the microprocessor. The power adjustment unit is configured to output constant power. The microprocessor is further configured to: replace the total e-liquid value L0 with the total time when the e-liquid can be inhaled, i.e., the total working time T0 of the heating resistor; replace the real-time value L of the remaining e-liquid with the real-time value T of the remaining working time of the heating resistor; replace the remaining e-liquid threshold L1 with the remaining time threshold T1; replace the microprocessor's analysis and judgment of L≤L1 with analysis and judgment of T≤T1; and replace the microprocessor's analysis and judgment of L>L1 with analysis and judgment of T>T1.

[0047] Specifically, this embodiment of an anti-dry-burning electronic cigarette includes a battery assembly and an atomizer. The atomizer includes a heating resistor. The battery assembly includes an electrically connected battery, a power regulation unit, a microprocessor, a start switch, a sampling reference resistor, a resistance detection unit, an e-liquid data storage module, and a timer. The timer, e-liquid data storage module, resistance detection unit, power regulation unit, and start switch are all communicatively connected to the microprocessor. When the start switch is on, the microprocessor controls the power regulation unit to output power to the heating resistor, the electronic cigarette operates, and the user inhales vapor. When the start switch is off, the microprocessor controls the power regulation unit to turn off the output to the heating resistor, the electronic cigarette enters standby mode, and the user stops smoking. The resistance detection unit is used to detect the real-time resistance value R of the heating resistor and transmit it to the microprocessor. The first resistance value detected during each puff is set as the initial resistance value R0. The timer is used to accumulate the operating time Ta of the start switch (i.e., the heating resistor) and send it to the microprocessor. The e-liquid data storage module can be used to store the real-time detected resistance value R, the real-time remaining operating time T of the heating resistor, and some initially set thresholds and data. The microprocessor is configured to read and determine if the real-time working margin T of the heating resistor is less than or equal to the margin threshold T1, and if the resistance change R-R0 of each inhalation is greater than or equal to the first resistance increase threshold R1. This indicates that the e-liquid in the atomizer is nearly depleted, and the resistance change during each inhalation exceeds the set value. Therefore, the microprocessor determines that the heating resistor has actually dry-burned and controls the power regulation unit to shut off its output, preventing it from supplying power to the heating resistor again. This accurately determines that the e-liquid in the atomizer is close to the minimum level and avoids continuing to supply power to an atomizer that is close to having no e-liquid, thus preventing the user from inhaling burnt smoke and causing a poor user experience.

[0048] Simultaneously, the microprocessor is configured to read and determine when the real-time value T of the working margin of the heating resistor is greater than the margin threshold T1, and when the resistance change amplitude R-R0 is greater than or equal to the second resistance increase threshold R2. This indicates that the e-liquid in the atomizer is still sufficient, but due to the atomizer's placement angle, the supply of e-liquid is untimely or insufficient, causing a temporary lack of e-liquid around the heating resistor, resulting in brief dry burning. Therefore, the microprocessor determines that the heating resistor may be temporarily dry burning and controls the power regulation unit to temporarily shut off the output, causing the heating resistor to stop working. If the supply of e-liquid around the heating resistor can be quickly restored, and the user continues to inhale, and the resistance change amplitude R-R0 is detected to be less than the second resistance increase threshold R2, the microprocessor controls the power regulation unit to restore power to the heating resistor, allowing the e-cigarette to continue working. In this situation, the microprocessor can accurately determine the temporary dry burning of the heating resistor and perform temporary dry burning protection, thus preventing the user from inhaling burnt smoke and causing a poor user experience.

[0049] The above configuration is based on the fact that the atomizer contains a certain amount of e-liquid, which, under the same power conditions, will be consumed by the heating resistor after a certain period of operation. There is a corresponding relationship between the total e-liquid volume L0 and the total working time T0 of the heating resistor, and the remaining e-liquid L also corresponds to the remaining working time T of the heating resistor. Furthermore, each time the user takes a puff, activating the switch connects the power supply once, and the duration of this connection is the duration of each puff. Therefore, the operating time of the activation switch is equal to the operating time of the heating resistor. Thus, the timer can accumulate the operating time of the activation switch, thus accumulating the accumulated operating time Ta and sending it to the microprocessor. If the total working time of the heating resistor is set to T0, the microprocessor can calculate the real-time remaining working time T = T0 - Ta.

[0050] Additionally, the timer is configured to calculate the time interval t between the end of the previous suction port and the start of the current suction port. The microprocessor is also configured to determine that when the time interval t is less than or equal to the time interval threshold t1, the microprocessor will calculate the initial resistance value R0 of the current port based on the initial resistance value R0 of the previous port.

[0051] The above configuration is because if the user continuously draws air and the interval between each two ports is very short, the heating resistor will work continuously without sufficient pause or standby time. The temperature will not have enough time to drop, and the resistance value will remain high. Therefore, the initial resistance value R0 of the next port will also be high and cannot drop normally. At this time, the resistance change value R-R0 cannot reflect the dry burning state. Therefore, when the interval t between each two ports is less than the time interval threshold, the initial resistance value R0 of the current port should be calculated according to the initial resistance value R0 of the previous port in order to truly reflect the large temperature rise and the occurrence of dry burning.

[0052] In this embodiment, the total duration for which the e-liquid can be drawn, i.e. the total duration for which the heating resistor can work, can be set to T0 = 3500 seconds. The remaining time for which the e-liquid can be drawn during dry burning, i.e. the remaining time for which the heating resistor can work, can be set to T1 = 35 seconds. The resistance increase of the heating resistor that may dry-burn during each puff can be set to R1 = 0.12Ω. The resistance increase of the heating resistor that may dry-burn during each puff can also be set to R2 = 0.17Ω. The time interval t1 = 3 seconds can be set.

[0053] In this embodiment, the value range of T1 can be set to (0.5%-2%)T0, the value range of R1 can be set to 0.05Ω-0.9Ω, and the value range of R2 can be set to 0.09Ω-1.0Ω. Furthermore, the value range of T0 can be set to (350-3500) seconds, and the value range of t1 can be set to 2-4 seconds.

[0054] In this embodiment, the start switch is an airflow sensor. In other embodiments, the start switch can also be a manual button switch, a microphone, or a pressure sensor. When the airflow sensor detects airflow or negative pressure generated in the air path of the electronic cigarette due to the user's smoking, it can trigger the microprocessor to connect the power supply to the heating resistor.

[0055] In this embodiment, the microprocessor also includes a flue gas information calculation module, a dry burning judgment module, and a resistance change judgment module. These modules are part of an integrated circuit element with specific functions.

[0056] The electronic cigarette in this embodiment is equipped with a timer and a resistance detection unit. The timer is equivalent to the e-liquid remaining detection unit and is configured to simultaneously detect the remaining e-liquid of the electronic cigarette and the resistance change value during each puff. It can accurately distinguish whether the electronic cigarette has reached a dry-burning state or a temporary dry-burning state, thereby performing permanent dry-burning protection and temporary dry-burning protection respectively, preventing users from inhaling electronic cigarette smoke with a burnt smell and improving the user's good user experience.

[0057] like Figure 4 As shown, on the T time axis, t11-t13, t21-t23, and t31-t33 represent the suction time for each inlet. The time points t11, t21, and t31 are the times when the start switch is turned on, t12, t22, and t32 are the times when the heating resistor is energized, and t13, t23, and t33 are the times when the heating resistor is de-energized.

[0058] In this embodiment of the electronic cigarette, the configuration of the resistance detection unit and the microprocessor further includes: when the resistance detection unit detects multiple real-time resistance values ​​R during each puff of the user's cigarette, from the time the power switch is turned on until the heating resistor is energized, the microprocessor selects the lowest value among these multiple real-time resistance values ​​R and sets it as the initial resistance value R0. In other embodiments, the microprocessor may also take the average value of the multiple real-time resistance values ​​R and set the average value as the initial resistance value R0, or select the first or last value among the multiple real-time resistance values ​​R and set it as the initial resistance value R0.

[0059] In this embodiment of the electronic cigarette, the battery assembly also includes a timer that is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to calculate the time interval t between the end of the previous puff and the start of the current puff. The microprocessor is also configured to determine that when the time interval t is less than or equal to the time interval threshold t1, the microprocessor calculates the initial resistance value R0 of the current puff according to the initial resistance value R0 of the previous puff.

[0060] Example 3

[0061] like Figure 3 As shown in Embodiment 2, this embodiment of the anti-dry-burning electronic cigarette further includes an anti-counterfeiting chip communicatively connected to a microprocessor in the atomizer. The e-liquid data storage module is located within the anti-counterfeiting chip, which also includes an anti-counterfeiting data storage module, a data backup module, and a data read / write processing module. The anti-counterfeiting chip is configured to identify whether the atomizer is genuine. The microprocessor is further configured to read the anti-counterfeiting data from the anti-counterfeiting data storage module and, if the anti-counterfeiting data does not match the genuine anti-counterfeiting data, control the power regulation unit to shut off its output and prevent it from supplying power to the atomizer's heating resistor again. This embodiment uses an anti-counterfeiting chip of model XJX001.

[0062] The anti-dry-burning electronic cigarette of this embodiment utilizes the storage module of the anti-counterfeiting chip to store the e-liquid data in the storage module of the anti-counterfeiting chip. This allows the atomizer to have anti-counterfeiting function while also making full use of the anti-counterfeiting chip to achieve the anti-dry-burning function, and also saves costs.

[0063] The electronic cigarette in this embodiment that prevents dry burning has the same circuit structure and functions as the previous embodiment.

[0064] In this embodiment, the microprocessor comprises a data anti-counterfeiting processing module, a tobacco liquid information calculation module, a dry burning judgment module, and a resistance change judgment module. These modules are part of an integrated circuit element with specific functions.

[0065] The above description is merely a preferred embodiment of the present utility model, and the specific embodiments described above are not intended to limit the present utility model. Various modifications and variations can be made within the scope of the technical concept of the present utility model. All refinements, modifications, or equivalent substitutions made by those skilled in the art based on the above description are within the scope of protection of the present utility model.

Claims

1. An electronic cigarette with anti-dry-burning feature, characterized in that, The device includes a battery assembly and an atomizer. The atomizer includes a heating resistor. The battery assembly includes an electrically connected battery, a power regulation unit, a microprocessor, a start switch, a sampling reference resistor, and a resistance detection unit. The atomizer or battery assembly also includes an e-liquid level detection unit and an e-liquid data storage module. The e-liquid level detection unit, e-liquid data storage module, resistance detection unit, power regulation unit, and start switch are all communicatively connected to the microprocessor. When the start switch is turned on or off, the microprocessor controls the power regulation unit to output power to the heating resistor or turn off the output. The resistance detection unit is used to detect the real-time resistance R of the heating resistor and transmit it to the microprocessor. The e-liquid level detection unit is used to detect the real-time e-liquid level in the atomizer. The time value L is transmitted to the microprocessor. The e-liquid data storage module is used to store the real-time resistance value R, the real-time e-liquid remaining value L, and some initially set thresholds and data. The microprocessor is configured to: set the real-time resistance value R detected when the user takes a puff from the time the power switch is turned on until the heating resistor is powered on, or the real-time resistance value R detected each time the atomizer is plugged into the battery assembly, as the initial resistance value R0; read and determine that the real-time e-liquid remaining value L is less than or equal to the e-liquid remaining threshold L1; and read and determine that the resistance change value R-R0 of the real-time resistance value R relative to the initial resistance value R0 during each puff is greater than or equal to the first resistance increase threshold R1; and control the power adjustment unit to immediately turn off the output and prohibit it from supplying power to the heating resistor again in order to prevent dry burning.

2. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The microprocessor includes a flue gas information calculation module, a dry burning judgment module, and a resistance change judgment module.

3. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The microprocessor is further configured to: read and determine that the real-time value of the remaining e-liquid is greater than the remaining e-liquid threshold L1, and read and determine that the resistance change amplitude value R-R0 is greater than or equal to the second resistance increase threshold R2, wherein the second resistance increase threshold R2 is greater than the first resistance increase threshold R1, and the microprocessor determines that the heating resistor may be dry-burning and controls the power regulation unit to temporarily shut off the output.

4. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, When the real-time resistance value R detected by the user during each suction inhalation from the time the start switch is turned on until the heating resistor is energized is set as the initial resistance value R0, the battery assembly also includes a timer that is communicatively connected to the start switch and the microprocessor respectively. The timer is configured to calculate the time interval t between the end of the previous suction inhalation and the start of the current suction inhalation. The microprocessor is also configured to determine that when the time interval t is less than or equal to the time interval threshold t1, the microprocessor calculates the initial resistance value R0 of the current inhalation according to the initial resistance value R0 of the previous inhalation.

5. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The remaining e-liquid detection unit is configured as a timer, which is communicatively connected to the start switch and the microprocessor. The timer is configured to accumulate the working time Ta of the start switch (i.e., the heating resistor) and send it to the microprocessor. The power adjustment unit is configured to output constant power. The microprocessor is further configured to: replace the total e-liquid value L0 with the total time when the e-liquid can be inhaled (i.e., the total working time T0 of the heating resistor); replace the real-time value L of the remaining e-liquid with the real-time value T of the remaining working time of the heating resistor; replace the remaining e-liquid threshold L1 with the remaining time threshold T1; and replace the microprocessor's analysis and judgment of L≤L1 with analysis and judgment of T≤T1.

6. The anti-dry-burning electronic cigarette according to claim 3, characterized in that, The remaining e-liquid detection unit is configured as a timer, which is communicatively connected to the start switch and the microprocessor. The timer is configured to accumulate the working time Ta of the start switch (i.e., the heating resistor) and send it to the microprocessor. The power adjustment unit is configured to output constant power. The microprocessor is further configured to: replace the total e-liquid value L0 with the total time when the e-liquid can be inhaled (i.e., the total working time T0 of the heating resistor); replace the real-time value L of the remaining e-liquid with the real-time value T of the remaining working time of the heating resistor; replace the remaining e-liquid threshold L1 with the remaining time threshold T1; replace the microprocessor's analysis and judgment of L≤L1 with analysis and judgment of T≤T1; and replace the microprocessor's analysis and judgment of L>L1 with analysis and judgment of T>T1.

7. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The configuration of the resistance detection unit and the microprocessor further includes: when the user takes a breath, the resistance detection unit detects multiple real-time resistance values ​​R before the heating resistor is energized. The microprocessor takes the lowest value among these multiple real-time resistance values ​​R and sets it as the initial resistance value R0.

8. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The configuration of the resistance detection unit and the microprocessor further includes: when the user takes a breath, the resistance detection unit detects multiple real-time resistance values ​​R before the heating resistor is energized. The microprocessor takes the average value of these multiple real-time resistance values ​​R and sets the average value as the initial resistance value R0.

9. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The configuration of the resistance detection unit and the microprocessor further includes: when the user takes a breath, the resistance detection unit detects multiple real-time resistance values ​​R before the heating resistor is energized. The microprocessor takes the first or last value of these multiple real-time resistance values ​​R and sets it as the initial resistance value R0.

10. The anti-dry-burning electronic cigarette according to claim 1, characterized in that, The atomizer also includes an anti-counterfeiting chip that is communicatively connected to the microprocessor. The e-liquid data storage module is located within the anti-counterfeiting chip. The anti-counterfeiting chip also includes an anti-counterfeiting data storage module, which is configured to identify whether the atomizer is a genuine atomizer.

11. The anti-dry-burning electronic cigarette according to claim 10, characterized in that, The microprocessor is also configured to read the anti-counterfeiting data from the anti-counterfeiting data storage module, and when it determines that the anti-counterfeiting data does not match the genuine anti-counterfeiting data, control the power regulator to shut off the output and prevent it from supplying power to the heating resistor of the atomizer again.

12. The anti-dry-burning electronic cigarette according to claim 10, characterized in that, The microprocessor includes a data anti-counterfeiting processing module, a liquid information calculation module, a dry burning judgment module, and a resistance change judgment module.

13. The anti-dry-burning electronic cigarette according to claim 10, characterized in that, The anti-counterfeiting chip also includes a data backup module and a data read / write processing module.

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