CN109588785B - Dry heating prevention control circuit of electronic cigarette - Google Patents
Dry heating prevention control circuit of electronic cigarette Download PDFInfo
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- CN109588785B CN109588785B CN201910056062.7A CN201910056062A CN109588785B CN 109588785 B CN109588785 B CN 109588785B CN 201910056062 A CN201910056062 A CN 201910056062A CN 109588785 B CN109588785 B CN 109588785B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 21
- 230000002265 prevention Effects 0.000 title description 6
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 4
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 iron-chromium-aluminum Chemical compound 0.000 description 1
- 239000006199 nebulizer Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
The invention relates to an anti-dry heating control circuit of an electronic cigarette, which comprises a power supply module, a step-up and step-down control module, a power control module, a detection module and an MCU; the power supply module is used for providing working voltage for the buck-boost control module and the MCU; the power control module and the detection module are both connected with an atomizer; and the MCU calculates the resistance value of the atomizer according to the detection signal, and when the frequency of the change rate of the resistance value of the atomizer exceeding a first preset threshold value is greater than or equal to a second preset threshold value, the MCU judges the atomizer to be in a dry burning state. According to the invention, whether dry burning occurs or not is timely judged by detecting the resistance change of the electronic cigarette atomizer, so that the dry burning is timely prevented, the circuit is simple and convenient, the detection result is accurate, the temperature control heating core and the non-temperature control heating core are both applicable, and the application range is wider.
Description
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to an anti-dry heating control circuit of an electronic cigarette.
Background
The atomizer of the electronic cigarette is generally divided into a temperature control heating core (Ni, ti, SS316 and other materials) and a non-temperature control heating core (Kang Taier, iron-chromium-aluminum, nickel-chromium and the like), and the experience degree of the temperature control heating core in use is much better than that of the non-temperature control heating core, mainly because the non-temperature control heating core cannot prevent dry heating, the resistance value of the non-temperature control heating core is very small in the heating process, and the TCR is relatively very stable; the temperature control heating core can prevent dry burning, but the requirements can be met only by one-to-one correspondence between the modes and the materials, so that the operation of a user is troublesome. In order to meet the requirement of better use experience of users, a new electronic cigarette power dry burning prevention circuit is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an anti-dry heating control circuit of an electronic cigarette, which is characterized by comprising a power supply module, a step-up and step-down control module, a power control module, a detection module and an MCU;
the power supply module is used for providing working voltage for the buck-boost control module and the MCU;
the power control module and the detection module are both connected with an atomizer;
the MCU is used for outputting a first control signal to the power control module through the buck-boost control module according to a preset rule, so that the power control module controls the output voltage of the atomizer according to the first control signal, wherein the preset rule is as follows: sequentially and circularly controlling the output voltage of the atomizer to be in a state of effective output, slow turning-off output, complete turning-off output and slow turning-on output; and the control module is used for outputting a second control signal to the detection module when the output voltage of the atomizer is in the effective output, the slowly-changed closing output and the slowly-changed opening output states, so as to control the detection module to be in the closing state, outputting a third control signal to the detection module when the output voltage of the atomizer is in the completely-closed output state, so as to control the detection module to be in the opening state, collecting detection signals fed back by the detection module, calculating the resistance value of the atomizer according to the detection signals, and judging as the dry burning state when the frequency of the change rate of the resistance value of the atomizer exceeds a first preset threshold value is larger than or equal to a second preset threshold value.
Further, when the MCU judges that the atomizer is in a dry heating state, the output voltage of the atomizer is controlled to be zero, so that the atomizer stops working.
Further, when the MCU judges that the dry combustion state is achieved, an audible and visual alarm device is controlled to work, so that an alarm reminding is sent out.
Further, the detection module comprises a triode Q3, a triode Q4, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38 and a capacitor C16; the base electrode of the triode Q4 is connected with the output end of the MCU, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the emitter electrode of the triode Q3 through a resistor R38, the emitter electrode of the triode Q3 is connected with the positive electrode of the power supply module, and the base electrode of the triode Q3 is connected with the collector electrode of the triode Q4 through a resistor R37; the resistor R35 and the resistor R36 are connected to form a first serial branch, the resistor R33 and the resistor R32 are connected to form a second serial branch, the collector of the triode Q3 is grounded through the first serial branch, the collector of the triode Q3 is connected with the second analog-to-digital conversion input end of the MCU through the second serial branch, one end of the atomizer is connected between the resistor R32 and the resistor R33, and the other end of the atomizer is grounded; one end of the capacitor C16 is connected between the resistor R32 and the second analog-to-digital conversion input end of the MCU, and the other end of the capacitor C16 is grounded; one end of the resistor R34 is connected with a connecting node between the resistor R36 and the resistor R35, and the other end of the resistor R34 is connected with a first analog-digital conversion input end of the MCU.
Further, the detection signal fed back by the detection module comprises a voltage V AD1 And voltage V AD2 ，V AD1 For the voltage value at one end of the resistor R34 connected with the MCU, V AD2 The voltage value between the resistor R33 and the resistor R32 is calculated by the formula (1) to obtain the resistance Res of the atomizer i Calculating the change rate delta R of the resistance value of the atomizer through a formula (2) i ：
Wherein Res is i Represents the resistance value measured at the ith time, n represents the number of times the resistance value of the atomizer is measured,
when DeltaR i If the value of the resistance value of the atomizer is larger than or equal to the first preset threshold value, the number of times that the change rate of the resistance value of the atomizer exceeds the first preset threshold value is counted as one time, and if the number of times that the accumulated change rate of the resistance value of the atomizer exceeds the first preset threshold value is larger than or equal to the second preset threshold value, the state of dry combustion is judged.
Further, the detection module further comprises a clamping circuit, the clamping circuit comprises a first diode and a second diode, the positive electrode of the first diode is connected with the collector electrode of the triode Q3, the positive electrode of the second diode is connected with the other end of the resistor R34, and the negative electrodes of the first diode and the second diode are connected with the power supply module.
Further, the triode Q4 is an NPN triode.
Further, the triode Q3 is a PNP triode.
Further, the power supply module comprises a direct current power supply and an LDO, wherein the output end of the direct current power supply is connected with the input end of the LDO, the first output end of the LDO is connected with the buck-boost control module, and the second output end of the LDO is connected with the MCU.
Further, the power control module comprises an amplifier U15, a resistor R11, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C25 and a diode D9; the non-inverting input end of the amplifier U15 is connected with one end of the resistor R11, the inverting input end of the amplifier U15 is connected with the other end of the resistor R11, the grounding end and the resetting end of the amplifier U15 are commonly grounded, the power end of the amplifier U15 is connected with a power supply, the power end of the amplifier U5 is grounded through a capacitor C25, the output end of the amplifier U15 is connected with the third analog-digital conversion input end of the MCU, the connecting node between the non-inverting input end of the amplifier U15 and the resistor R11 is connected with the output end of the buck-boost control module, the input end of the buck-boost control module is connected with the power supply module, the connecting node between the inverting input end of the amplifier U15 and the resistor R11 is connected with one end of the atomizer, and the other end of the atomizer is grounded; the resistor R19 and the resistor R20 are connected to form a third serial branch, one end of the third serial branch is connected with a connecting node of the resistor R11 and the atomizer, the other end of the third serial branch is grounded, the resistor R21 and the capacitor C24 are connected to form a fourth serial branch, one end of the fourth serial branch is grounded, the other end of the fourth serial branch is connected between the resistor R19 and the resistor R20, and a connecting node between the resistor R21 and the capacitor C24 is connected with a fourth analog-to-digital conversion input end of the MCU; one end of a capacitor C11 and the cathode of a diode D9 are respectively connected to the connection node of the resistor R11 and the atomizer, the anode of the diode D9 is grounded, and the other end of the capacitor C11 is grounded.
The beneficial effects of the invention are as follows: according to the invention, whether dry burning occurs or not is timely judged by detecting the resistance change of the electronic cigarette atomizer, so that the dry burning is timely prevented, the method is simple and convenient, the detection result is accurate, and the electronic cigarette atomizer is applicable to both temperature-controlled heating cores and non-temperature-controlled heating cores and has a wider application range.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
FIG. 3 is a graph showing the output voltage status of the atomizer according to the present invention and the relationship of the output voltage status to the third control signal; in the figure, a 1-power control module and a 2-detection module are shown.
Detailed Description
The invention will be further described with reference to the accompanying drawings and detailed description below:
as shown in fig. 1 and fig. 2, an anti-dry heating control circuit of an electronic cigarette comprises a power supply module, a buck-boost control module, a power control module 1, a detection module 2 and an MCU, wherein the MCU is preferably a single-chip microcomputer.
The power supply module comprises a direct current power supply and an LDO (Chinese is called low dropout linear regulator).
The power supply module is used for providing working voltage for the buck-boost control module and the MCU;
the power control module 1 and the detection module 2 are both connected with a nebulizer, i.e. the load Rct.
The power control module 1 comprises an amplifier U15, a resistor R11, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C25 and a diode D9, wherein the non-inverting input end (shown as IN+ IN the figure) of the amplifier U15 is connected with one end of the resistor R11, the inverting input end (shown as IN-IN the figure) of the amplifier U15 is connected with the other end of the resistor R11, the grounding end and the resetting end of the amplifier U15 are commonly grounded, the power supply end of the amplifier U15 is connected with a power supply for providing the working voltage of the amplifier U15, the power supply is a 10V power supply, the power supply end of the amplifier U5 is grounded through the capacitor C25, and the output end of the amplifier U15 is connected with the third analog-digital conversion input end of the MCU, namelyThe connecting line AD_C of the middle amplifier U15 is connected with the connecting line AD_C of the MCU, a connecting node between the non-inverting input end of the amplifier U15 and the resistor R11 is connected with the output end of the buck-boost control module, and the input end of the buck-boost control module is connected with the direct current power supply; the current output by the buck-boost control module is amplified by a resistor R11 and an amplifier U15 and then converted into a voltage signal, the voltage signal is converted into a digital voltage by the third analog-digital conversion of the MCU, and the digital voltage is recorded as U Number of digits Thereby the current flowing through the resistor R11 can be calculatedThe current is the current flowing through the load Rct, and the voltage V across the load Rct Rct Since the real-time power P of the load can be calculated by dividing the voltage by the resistor R19 and the resistor R20, there is p=u Number of digits *I R11 ；
The connection node between the inverting input end of the amplifier U15 and the resistor R11 is connected with one end of a load Rct, and the other end of the load Rct is grounded; the resistor R19 is connected with the resistor R20 to form a third serial branch, one end of the third serial branch is connected with a connecting node of the resistor R11 and a load, the resistor R21 is connected with the capacitor C24 to form a fourth serial branch, one end of the fourth serial branch is grounded, the other end of the fourth serial branch is connected between the resistor R19 and the resistor R20, a connecting node between the resistor R21 and the capacitor C24 is connected with a fourth analog-to-digital conversion input end of the MCU, namely a connecting line AD_V on the third serial branch is connected with a connecting line AD_V on the MCU in the figure; the connection node between the resistor R11 and the load is also respectively connected with one end of the capacitor C11 and the cathode of the diode D9, the anode of the diode D9 is grounded, and the other end of the capacitor C11 is grounded.
The detection module 2 comprises a triode Q3, a triode Q4, a clamping circuit D10, a plurality of resistors and a plurality of capacitors; the base (i.e. B pole) of triode Q4 is connected with MCU's output, MCU provides high low level to triode Q4's base, triode Q4's projecting pole (i.e. e pole) ground connection, triode Q4's collecting electrode (i.e. c pole) is connected with triode Q3's projecting pole through resistance R38, triode Q3's projecting pole is connected with a DC power supply's positive pole, namely B+ department connects DC power supply's positive pole in the drawing, DC power supply provides positive voltage to triode Q3's projecting pole, DC power supply can be the battery, triode Q3's base is connected with triode Q4's collecting electrode through resistance R37. The resistor R35 and the resistor R36 are connected to form a first serial branch, the resistor R33 and the resistor R32 are connected to form a second serial branch, the collector of the triode Q3 is grounded through the first serial branch, the collector of the triode Q3 is connected with the first positive electrode of the bipolar diode through the second serial branch, one end of the load Rct is connected between the resistor R32 and the resistor R33, and the other end of the load Rct is grounded. A second analog-to-digital conversion input end (not shown in the figure) of the MCU and one end of the capacitor C16 are both connected between the resistor R32 and the first anode of the bipolar diode, i.e. AD2 in the figure is connected to the second analog-to-digital conversion input end of the MCU, and the other end of the capacitor C16 is grounded. One end of the resistor R34 is connected with a connecting node between the resistor R36 and the resistor R35, the other end of the resistor R34 is connected with a first analog-to-digital conversion (not shown in the figure) input end of the MCU, namely AD1 in the figure is connected with the first analog-to-digital conversion input end of the MCU, the positive electrode of the second diode is connected with the other end of the resistor R34, one end of the capacitor C21 is connected with the other end of the resistor R34, the other end of the capacitor C21 is grounded, the negative electrode of the first diode and the negative electrode of the second diode are both connected with a power supply module, the power supply module supplies clamping voltage to the first diode and the second diode, the clamping voltage is 3.3V in the embodiment, and the first diode and the second diode form a clamping circuit D10.
The output end Uout of the load Rct is connected with the MCU, and the MCU controls the output change state of the load voltage.
In this embodiment, the transistor Q4 is an NPN transistor, and the transistor Q3 is a PNP transistor.
The input end of the LDO is connected with a direct current power supply, the output end of the LDO is connected with the MCU and the clamping circuit D10 respectively, and the LDO is used for converting the voltage of the direct current power supply and providing required working voltage for the MCU and the clamping circuit D10, for example providing clamping voltage of 3.3V for the clamping circuit D10.
The detection signal fed back by the detection module comprises a voltage V AD1 And voltage V AD2 ，V AD1 Is connected with MCU for resistor R34Voltage value at one end, V AD2 The voltage value between the resistor R33 and the resistor R32 is calculated by the formula (1) to obtain the resistance Res of the atomizer i Calculating the change rate delta R of the resistance value of the atomizer through a formula (2) i ：
Wherein Res is i Represents the resistance value measured at the ith time, n represents the number of times the resistance value of the atomizer is measured,
when DeltaR i If the value of the resistance value of the atomizer is larger than or equal to the first preset threshold value, the number of times that the change rate of the resistance value of the atomizer exceeds the first preset threshold value is counted as one time, and if the number of times that the accumulated change rate of the resistance value of the atomizer exceeds the first preset threshold value is larger than or equal to the second preset threshold value, the state of dry combustion is judged.
As shown in fig. 3, the electronic cigarette is controlled to work normally by the MCU to control the buck-boost control module and the power control module 1, and the output voltage of the load Rct is controlled to be in a periodic output state, wherein the output states include an effective output, a gradual closing output, a complete closing output and an output state of gradual opening output, the output states correspond to a high level, a falling edge, a low level and a rising edge, the effective output period is marked as T1, the gradual closing output is marked as T2, the complete closing output is marked as T3, the gradual opening output period is marked as T3, the high level indicates that the load is effective, the low level indicates that the load is completely closed, namely, no voltage output exists, the falling edge indicates that the load is converted from the effective output to the complete closing process, and the rising edge indicates that the load is converted from the complete closing to the effective output;
specifically, the MCU is configured to output a first control signal to the power control module through the buck-boost control module according to a preset rule, so that the power control module controls the output voltage of the atomizer according to the first control signal, where the preset rule is: sequentially and circularly controlling the output voltage of the atomizer to be in a state of effective output, slow turning-off output, complete turning-off output and slow turning-on output; and the control circuit is used for outputting a second control signal to the detection module, namely providing a low level for the triode Q4 to control the detection module to be in a closed state when the output voltage of the atomizer is in a state of effective output, slowly-turned-off output and slowly-turned-on output, outputting a third control signal to the detection module, namely providing a high level for the triode Q4 to control the detection module to be in an open state, collecting detection signals fed back by the detection module and calculating the resistance value of the atomizer according to the detection signals when the output voltage of the atomizer is in a completely-turned-off output state.
The over-power control module 1 controls the duration of the load in the individual level periods so as to effectively measure a plurality of resistance values of the load under different levels, specifically, the resistance Res of the load Rct corresponding to a plurality of low level periods T3 is calculated by the formula (1) in the step 1 at a preset sampling frequency, for example, 100 times/second, namely, every 0.01 second i (i=1, 2,3, …, n), where Res i Represents the i-th measured resistance value, n represents the value of the sampling frequency, i.e. the number of times the resistance of the load Rct is measured, and calculates the normal resistance Res of the load Rct corresponding to the high level period T1 0 Normal resistance Res corresponding to load Rct in high level period T1 0 Is constant and normal, and calculates the resistance change rate delta R of the load Rct by the formula (2) i Each resistor measured in the period T3 is compared with a normal resistor, and when the change rate of the resistor is greater than or equal to a first preset threshold, for example, the first preset threshold is 80%, the number of times that the change rate of the resistor of the atomizer exceeds the first preset threshold is counted as one, and when the number of times that the change rate of the resistor of the atomizer obtained by accumulation exceeds the first preset threshold is greater than or equal to a second preset threshold, for example, the second preset threshold is 5 times or 10 times or other times, the load starts to dry combustion. When entering the T3 period, the MCU controls the high level to be provided for the base electrode of the triode Q4, and timely measuresResistor Res of load Rct in period T3 i (i=1, 2,3, …, n), the change rate Δr of the resistance value calculated by the formula (2) first i Greater than or equal to a first preset threshold epsilon (0<ε<1) When the obtained change rate DeltaR is accumulated i If the number of times greater than or equal to the first preset threshold epsilon is greater than or equal to the second preset threshold epsilon ', for example epsilon' =5, the load is judged to be dry-burned, so that the change rate delta R of the resistance value of the atomizer caused by interference factors can be avoided i Misjudgment caused by accidental being greater than or equal to a first preset threshold value can be achieved by controlling the audible and visual alarm device to work to give out audible and visual alarm or directly closing the output of the power control module 1, so that the output voltage of the load is zero, the atomizer stops working, dry burning of the load is prevented, and the load is effectively protected.
Therefore, the dry burning prevention control of the electronic cigarette can be realized through the following steps:
step 1: the MCU outputs a first control signal to the power control module through the buck-boost control module so that the power control module controls the output voltage of the atomizer according to the first control signal; sequentially and circularly controlling the output voltage of the atomizer to be in a state of effective output, slow turning-off output, complete turning-off output and slow turning-on output;
step 2: when the output voltage of the output end Uout of the atomizer is in a low level period, the singlechip outputs a high level to the dry-heating prevention detection circuit to enable the dry-heating prevention detection circuit to be in an on state, the resistor Res corresponding to the period when the atomizer is in the low level is calculated according to a detection signal fed back by the detection module at a preset sampling frequency i A size of (i=1, 2,3, …, n), wherein Res i The resistance value measured at the ith time is represented, and n represents the value of the sampling frequency;
step 3: calculating the resistance change rate delta R of the load Rct by the formula (2) i If the resistance change rate DeltaR i And (3) if the times of the load atomizer being larger than or equal to the first preset threshold value are larger than or equal to the second preset threshold value, judging that the atomizer is dry-burned, closing the load atomizer, and otherwise, repeating the steps (1-3).
Various other corresponding changes and modifications will occur to those skilled in the art from the foregoing description and the accompanying drawings, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (7)
1. The anti-dry heating control circuit of the electronic cigarette is characterized by comprising a power supply module, a step-up and step-down control module, a power control module, a detection module and an MCU;
the power supply module is used for providing working voltage for the buck-boost control module and the MCU;
the power control module and the detection module are both connected with an atomizer;
the MCU is used for outputting a first control signal to the power control module through the buck-boost control module according to a preset rule, so that the power control module controls the output voltage of the atomizer according to the first control signal, wherein the preset rule is as follows: sequentially and circularly controlling the output voltage of the atomizer to be in a state of effective output, slow turning-off output, complete turning-off output and slow turning-on output; and is used for outputting a second control signal to the detection module when the output voltage of the atomizer is in the state of effective output, slowly-turned-off output and slowly-turned-on output, so as to control the detection module to be in the off state, outputting a third control signal to the detection module when the output voltage of the atomizer is in the completely-turned-off output state, so as to control the detection module to be in the on state, collecting detection signals fed back by the detection module, calculating the resistance value of the atomizer according to the detection signals, judging as a dry burning state when the frequency of the change rate of the resistance value of the atomizer exceeds a first preset threshold value is larger than or equal to a second preset threshold value,
the detection module comprises a triode Q3, a triode Q4, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38 and a capacitor C16; the base electrode of the triode Q4 is connected with the output end of the MCU, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the emitter electrode of the triode Q3 through a resistor R38, the emitter electrode of the triode Q3 is connected with the positive electrode of the power supply module, and the base electrode of the triode Q3 is connected with the collector electrode of the triode Q4 through a resistor R37; the resistor R35 and the resistor R36 are connected to form a first serial branch, the resistor R33 and the resistor R32 are connected to form a second serial branch, the collector of the triode Q3 is grounded through the first serial branch, the collector of the triode Q3 is connected with the second analog-to-digital conversion input end of the MCU through the second serial branch, one end of the atomizer is connected between the resistor R32 and the resistor R33, and the other end of the atomizer is grounded; one end of the capacitor C16 is connected between the resistor R32 and the second analog-to-digital conversion input end of the MCU, and the other end of the capacitor C16 is grounded; one end of the resistor R34 is connected with a connecting node between the resistor R36 and the resistor R35, the other end of the resistor R34 is connected with a first analog-digital conversion input end of the MCU,
the detection signal fed back by the detection module comprises voltageAnd voltage->，/>For the voltage value at the end of the resistor R34 connected with the MCU, < >>For the voltage value between the resistor R33 and the resistor R32, the resistance value of the atomizer is calculated by the formula (1)>Calculating the change rate of the resistance value of the atomizer according to the formula (2)>：
------①
------②
Wherein,indicate->The next measured resistance value, +.>Indicating the number of times the resistance value of the atomizer is measured,
when (when)If the value of the resistance value of the atomizer is larger than or equal to the first preset threshold value, the number of times that the change rate of the resistance value of the atomizer exceeds the first preset threshold value is counted as one time, if the number of times that the accumulated change rate of the resistance value of the atomizer exceeds the first preset threshold value is larger than or equal to the second preset threshold value, the state of dry combustion is judged,
the detection module further comprises a clamping circuit, the clamping circuit comprises a first diode and a second diode, the positive electrode of the first diode is connected with the collector electrode of the triode Q3, the positive electrode of the second diode is connected with the other end of the resistor R34, and the negative electrodes of the first diode and the second diode are connected with the power supply module.
2. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: and when the MCU judges that the atomizer is in a dry heating state, controlling the output voltage of the atomizer to be zero, so that the atomizer stops working.
3. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: and when the MCU judges that the heating state is dry, controlling an audible and visual alarm device to work, thereby sending out an alarm prompt.
4. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: the triode Q4 is an NPN triode.
5. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: the triode Q3 is a PNP triode.
6. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: the power supply module comprises a direct current power supply and an LDO, wherein the output end of the direct current power supply is connected with the input end of the LDO, the first output end of the LDO is connected with the buck-boost control module, and the second output end of the LDO is connected with the MCU.
7. The anti-dry heating control circuit of the electronic cigarette according to claim 1, wherein: the power control module comprises an amplifier U15, a resistor R11, a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a capacitor C25 and a diode D9; the non-inverting input end of the amplifier U15 is connected with one end of the resistor R11, the inverting input end of the amplifier U15 is connected with the other end of the resistor R11, the grounding end and the resetting end of the amplifier U15 are commonly grounded, the power end of the amplifier U15 is connected with a power supply, the power end of the amplifier U5 is grounded through a capacitor C25, the output end of the amplifier U15 is connected with the third analog-digital conversion input end of the MCU, the connecting node between the non-inverting input end of the amplifier U15 and the resistor R11 is connected with the output end of the buck-boost control module, the input end of the buck-boost control module is connected with the power supply module, the connecting node between the inverting input end of the amplifier U15 and the resistor R11 is connected with one end of the atomizer, and the other end of the atomizer is grounded; the resistor R19 and the resistor R20 are connected to form a third serial branch, one end of the third serial branch is connected with a connecting node of the resistor R11 and the atomizer, the other end of the third serial branch is grounded, the resistor R21 and the capacitor C24 are connected to form a fourth serial branch, one end of the fourth serial branch is grounded, the other end of the fourth serial branch is connected between the resistor R19 and the resistor R20, and a connecting node between the resistor R21 and the capacitor C24 is connected with a fourth analog-to-digital conversion input end of the MCU; one end of a capacitor C11 and the cathode of a diode D9 are respectively connected to the connection node of the resistor R11 and the atomizer, the anode of the diode D9 is grounded, and the other end of the capacitor C11 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110301677A (en) * | 2019-07-12 | 2019-10-08 | 深圳市福来科技有限公司 | A kind of detection and control method for preventing from heating smoking set dry combustion method of not burning |
| CN110584204B (en) * | 2019-07-30 | 2023-06-02 | 深圳麦克韦尔科技有限公司 | Heating control method and device of electronic atomization device and electronic atomization device |
| CN110632133B (en) * | 2019-09-27 | 2024-05-10 | 深圳迪致科技术有限公司 | Detection circuit and detection method for use state of electronic cigarette equipment |
| CN110731545B (en) * | 2019-10-18 | 2022-12-27 | 深圳麦克韦尔科技有限公司 | Atomization assembly heating control method and device, electronic atomization device and storage medium |
| CN111000294B (en) * | 2019-12-17 | 2022-07-08 | 深圳麦克韦尔科技有限公司 | Heating method and device of atomizer, computer equipment and storage medium |
| CN114468380A (en) * | 2020-10-27 | 2022-05-13 | 深圳市合元科技有限公司 | Aerosol generating device |
| CN113030604A (en) * | 2020-12-18 | 2021-06-25 | 深圳来福士雾化医学有限公司 | Atomizer dry burning prevention recognition application and circuit thereof |
| CN114680396A (en) * | 2020-12-31 | 2022-07-01 | 常州市派腾电子技术服务有限公司 | Intelligent early warning system for preventing dry burning of electronic cigarette |
| CN115067564A (en) * | 2021-03-16 | 2022-09-20 | 深圳市合元科技有限公司 | Electronic atomization device, power supply mechanism and atomizer identification method |
| CN118203153A (en) * | 2022-12-15 | 2024-06-18 | 深圳麦时科技有限公司 | Detection method, detection device, readable storage medium, and aerosol atomization device |
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