CN115067577A - Airflow sensing device and electronic cigarette device - Google Patents
Airflow sensing device and electronic cigarette device Download PDFInfo
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- CN115067577A CN115067577A CN202210818265.7A CN202210818265A CN115067577A CN 115067577 A CN115067577 A CN 115067577A CN 202210818265 A CN202210818265 A CN 202210818265A CN 115067577 A CN115067577 A CN 115067577A
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- 239000003571 electronic cigarette Substances 0.000 title abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 230000006698 induction Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 27
- 230000003068 static effect Effects 0.000 abstract description 10
- 230000033228 biological regulation Effects 0.000 abstract description 6
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 16
- 230000010355 oscillation Effects 0.000 description 9
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 8
- 239000013256 coordination polymer Substances 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
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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
- A24F40/51—Arrangement of sensors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides an airflow sensing device and an electronic cigarette device, which comprise a battery, a boosting module, a sensing module and a regulating module; the battery is connected the voltage input end of the boost module, the voltage output end of the boost module is connected with the induction module and the regulation module, the induction module is connected with the regulation module, the induction module is used for inducing airflow change and transmitting the induced airflow change to the regulation module, the regulation module is connected with the enabling end of the boost module, and the regulation module enables the boost module according to the airflow change. The invention can adopt a battery with lower working voltage, has lower cost and extremely low power consumption under static state, ensures the sensitivity of airflow change induction and improves the stability of the airflow sensing device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of sensing, in particular to an airflow sensing device and an electronic cigarette device.
[ background of the invention ]
The airflow sensor is mainly used in electronic cigarettes, which belong to portable articles, and are powered by a power battery, lithium cobaltate batteries or ternary lithium batteries are generally adopted, and with the soaring price of noble metals such as cobalt, nickel and manganese, the price of the lithium cobaltate batteries or ternary lithium batteries also rises, and lithium iron phosphate (LiFePO, LFP for short) batteries are much cheaper. However, the rated voltage of a single lithium iron phosphate battery is 3.2V, the charge cut-off voltage is 3.6-3.65V, and the minimum over-discharge battery voltage is close to 2V, so that the airflow sensor powered by the single lithium iron phosphate battery must work within the range of 2-4V, but does not work within the range of 3-5V powered by a cobalt acid lithium battery or a ternary lithium battery, and an airflow sensing device working at an extremely low voltage (2-4V) is urgently needed in the industry.
Generally, the power supply voltage (2-4V) of a single lithium iron phosphate battery is boosted to be within a range of 3-5V by adding a charge pump boosting unit, but the static power consumption (i.e. no smoking) of the charge pump boosting unit without output current is at least dozens of microamperes, the static power consumption is large, and the extremely low power consumption (generally less than 10 microamperes) in the static state is difficult to realize. And when the airflow sensing unit works in an extremely low voltage (2-4V) range, the sensitivity and the stability of the airflow sensor are difficult to guarantee.
In view of the above, it is desirable to provide a new airflow sensing device and an electronic cigarette device to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide an airflow sensing device and an electronic cigarette device, which can adopt a battery with lower working voltage, have lower cost and extremely low power consumption in a static state, ensure the sensitivity of airflow change sensing and improve the stability of the airflow sensing device.
In order to achieve the above object, in a first aspect, the present invention provides an airflow sensing device, including a battery, a boosting module, an induction module, and a regulation module; the battery is connected with a voltage input end of the boosting module, a voltage output end of the boosting module is connected with the sensing module and the adjusting module, the sensing module is connected with the adjusting module, the sensing module is used for sensing airflow change and transmitting the sensed airflow change to the adjusting module, the adjusting module is connected with an enabling end of the boosting module, and the adjusting module enables the boosting module to be in a through state or a boosting state according to the airflow change.
In a preferred embodiment, when the airflow variation is smaller than a first preset threshold, the regulating module enables the boosting module to be in a through state, the battery directly supplies power to the sensing module and the regulating module without being boosted by the boosting module, and the regulating module outputs a low level; when the airflow change is larger than or equal to the first preset threshold and smaller than a second preset threshold, the regulating module enables the boosting module to be in a boosting state, the battery supplies power to the induction module and the regulating module after being boosted by the boosting module, and the regulating module outputs a low level; when the airflow change is larger than or equal to the second preset threshold value, the adjusting module enables the boosting module to be in a boosting state, the battery supplies power to the sensing module and the adjusting module after being boosted by the boosting module, and the adjusting module outputs a high level.
In a preferred embodiment, the boost module includes a current source, a switch array and a cross-over capacitor, the switch array includes a first switch, a second switch, a third switch and a fourth switch, the first switch, the second switch, the third switch and the fourth switch are connected in series, one end of the cross-over capacitor is connected to a connection point between the first switch and the second switch, the other end of the cross-over capacitor is connected to a connection point between the third switch and the fourth switch, the voltage input end is connected to a connection point between the second switch and the third switch through the current source, one end of the first switch is connected to the voltage output end, and one end of the fourth switch is grounded.
In a preferred embodiment, the boost module further includes a first voltage-dividing resistor, a second voltage-dividing resistor, a comparator, a reference voltage source, and a logic controller; one end of the first voltage-dividing resistor is connected with the voltage output end, the other end of the first voltage-dividing resistor is connected with one end of the second voltage-dividing resistor, the other end of the second voltage-dividing resistor is grounded, one input end of the comparator is connected with a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor, the other input end of the comparator is connected with the reference voltage source, the output end of the comparator is connected with one input end of the logic controller, the other input end of the logic controller is connected with the enable end, and the output end of the logic controller is connected with the switch array.
In a preferred embodiment, the sensing module includes a first oscillator, a second oscillator, a frequency divider, and a counter, the first oscillator is connected to an oscillating capacitor, the first oscillator is connected to the counter through the frequency divider, the second oscillator is connected to a sensing capacitor that varies with an air flow, the second oscillator is connected to the counter, the counter is connected to the adjusting module, and the counter outputs a digital signal to the adjusting module.
In a preferred embodiment, the adjusting module includes a first determining unit and a second determining unit, the first determining unit and the second determining unit receive the digital signal output by the counter, the first determining unit is connected to the enable terminal, the first determining unit controls the level of the enable terminal according to the digital signal, and the second determining unit controls the level output by the adjusting module according to the digital signal.
In a preferred embodiment, the adjusting module further includes a supply voltage detecting unit connected to the second determining unit, the supply voltage detecting unit is further connected to the voltage output end, and when the voltage at the voltage output end is smaller than a preset undervoltage protection threshold, the supply voltage detecting unit controls the second determining unit to turn off the output of the adjusting module.
In a preferred embodiment, the switch array is connected with a mode switching unit, and the mode switching unit controls on/off of switches in the switch array according to a signal of the enable end; the first output end of the mode switching unit is connected with the first switch, the first output end of the mode switching unit is connected with the third switch through a first phase inverter, the second output end of the mode switching unit is connected with the second switch through a second phase inverter, and the second output end of the mode switching unit is connected with the fourth switch.
In a preferred embodiment, the lowest operating voltage of the first oscillator and the second oscillator is less than 1.8V.
In a second aspect, the invention provides an electronic vaping device comprising an airflow sensing device as described in any of the above.
Compared with the prior art, the airflow sensing device and the electronic cigarette device provided by the invention have the advantages that the sensing module can transmit the sensed airflow change to the adjusting module, the adjusting module can enable the boosting module according to the airflow change, the boosting module has two working states of a through state and a boosting state, the adjusting module is internally provided with a first preset threshold and a second preset threshold, when the airflow change is smaller than the first preset threshold, the adjusting module enables the boosting module to be in the through state, the adjusting module outputs a low level, when the airflow change sensed by the sensing module is increased to exceed the first preset threshold, the boosting module is switched from the through state to the boosting state, the adjusting module still outputs the low level by default, and when the airflow change is continuously increased to exceed the second preset threshold, the adjusting module outputs the high level, and the battery with lower working voltage can be adopted, the cost is lower, the power consumption is extremely low under the static state, the sensitivity of the airflow change induction is ensured, and the stability of the airflow sensing device is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic block diagram of an airflow sensing device provided by the present invention;
FIG. 2 is a schematic diagram of a boost module in the airflow sensing device provided by the present invention;
FIG. 3 is a schematic diagram illustrating the control of a switch array in an airflow sensing device according to the present invention;
FIG. 4 is a schematic diagram of an induction module in the airflow sensing device provided by the present invention;
fig. 5 is a circuit diagram of a second oscillator in the airflow sensing device provided in the present invention;
FIG. 6 is a circuit diagram of an induction module in the airflow sensing device provided by the present invention;
FIG. 7 is a waveform diagram of power-on, reset, bias current and oscillation output signals of an inductor module in the airflow sensing device provided by the present invention;
fig. 8 is a schematic diagram of a conditioning module in the airflow sensing device provided by the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1, which is a schematic block diagram of an airflow sensing device according to the present invention. The airflow sensing device 100 provided by the invention can be applied to an electronic cigarette device, and the airflow sensing device 100 specifically comprises a battery 10, a boosting module 20, a sensing module 30 and an adjusting module 40.
The battery 10 is connected to a voltage input terminal Vbat of the boost module 20, a voltage output terminal Vcco of the boost module 20 is connected to the sensing module 30 and the adjusting module 40, the sensing module 30 is connected to the adjusting module 40, the sensing module 30 is configured to sense a change in an airflow and transmit the sensed change in the airflow to the adjusting module 40, the adjusting module 40 is connected to an enable terminal EN of the boost module 20, and the adjusting module 40 enables the boost module 20 to be in a direct-through state or a boost state according to the change in the airflow.
When the airflow variation is smaller than a first preset threshold, the adjusting module 40 enables the boosting module 20 to be in a through state, the battery 10 directly supplies power to the sensing module 30 and the adjusting module 40 without being boosted by the boosting module 20, and the adjusting module 40 outputs a low level; when the airflow variation is greater than or equal to the first preset threshold and less than a second preset threshold, the adjusting module 40 enables the boosting module 20 to be in a boosting state, the battery 10 supplies power to the sensing module 30 and the adjusting module 40 after being boosted by the boosting module 20, and the adjusting module 40 outputs a low level; when the airflow variation is greater than or equal to the second preset threshold, the adjusting module 40 enables the boosting module 20 to be in a boosting state, the battery 10 supplies power to the sensing module 30 and the adjusting module 40 after being boosted by the boosting module 20, and the adjusting module 40 outputs a high level.
Specifically, the boost module 20 has two operating modes, which are a direct-through state and a boost state, when the boost module is in the direct-through state, the voltage of the voltage output end Vcco of the boost module 20 is approximately equal to the voltage of the voltage input end Vbat, the sensing module 30 and the adjusting module 40 are both in the operating state of lower voltage (not boosted), the power consumption is lower, when the boost module is in the boost state, the voltage output end Vcco of the boost module 20 is greater than the voltage of the voltage input end Vbat, that is, the battery 10 supplies power to the sensing module 30 and the adjusting module 40 after being boosted by the boost module 20, and the sensing module 30 and the adjusting module 40 are at normal operating voltages, so that the sensitivity and stability of the sensing module 30 can be ensured.
It can be understood that a first preset threshold and a second preset threshold are disposed in the adjusting module 40, and the first preset threshold is smaller than the second preset threshold. When the user does not smoke (i.e. in a static state), that is, the airflow variation is smaller than the first preset threshold (including no airflow variation), the adjusting module 40 enables the voltage boosting module 20 to be in a direct-through state, and the adjusting module 40 outputs a low level, that is, the voltage boosting module 20 does not boost in the static state, the power consumption of the sensing module 30 and the power consumption of the adjusting module 40 are very low, and the adjusting module 40 outputs the low level by default. When the airflow variation sensed by the sensing module 30 increases to cross the first preset threshold, the boost module 20 is switched from the through state to the boost state, the adjusting module 40 still outputs the low level by default, and when the airflow variation continues to increase to cross the second preset threshold, the adjusting module 40 outputs the high level, so that the user can smoke normally.
Therefore, in the airflow sensing device 100 provided by the present invention, the sensing module 30 can transmit the sensed airflow variation to the adjusting module 40, the adjusting module 40 can enable the boosting module 20 according to the airflow variation, the boosting module 20 has two working states, i.e. a through state and a boosting state, a first preset threshold and a second preset threshold are provided in the adjusting module 40, when the airflow variation is smaller than the first preset threshold, the adjusting module 40 enables the boosting module 20 to be in the through state, and the adjusting module 40 outputs a low level, when the airflow variation sensed by the sensing module 30 increases to exceed the first preset threshold, the boosting module 20 is switched from the through state to the boosting state, the adjusting module 40 still defaults to output the low level, and when the airflow variation continues to increase to exceed the second preset threshold, the adjusting module 40 outputs a high level, so designed, a battery with a lower working voltage can be used, the cost is lower, the power consumption is extremely low under the static state, the sensitivity of the airflow change induction is ensured, and the stability of the airflow sensing device is improved.
Further, when the airflow variation sensed by the sensing module 30 is reduced to be smaller than the first preset threshold, the boosting module 20 is switched from the boosting state to the through state in a delayed manner. It can be understood that, the boost module 20 generates an interference signal to other units in the process of converting from the direct-connection state operating mode to the boost state operating mode, and the sensitivity of the sensing module 30 is affected, so that it is required to set the boost module 20 to have the function of turning off the delay in the boost state operating mode, specifically, a time of half a minute, two minutes or longer may be set, and the sensitivity and the high stability of the sensing module 30 can be further ensured.
The battery 10 is a lithium iron phosphate battery, the lowest working voltage of the battery 10 is less than 2V, and the lowest battery voltage is close to 2V when the battery is over-discharged. Specifically, a single lithium iron phosphate battery can be used for power supply, so that the cost is low, and in order to adapt to the power supply of the single lithium iron phosphate battery, the minimum working voltage of the boosting module 20 must be lower than 2V, which is generally considered to be 1.6-1.9V.
The boost module 20 may specifically be a charge pump boost module, which has two operation modes, i.e., a direct-connection state and a boost state, and is controlled by a signal output from the regulating module 40 to the enable terminal EN. For example, when the enable terminal EN is low, the boost module 20 is in the through-state operation mode, and the voltage output terminal Vcco is approximately equal to the voltage of the voltage input terminal Vbat (i.e., the battery voltage); when the enable terminal EN is high, the boost module 20 has a double-voltage boost operation mode, in which the voltage output terminal Vcco is approximately equal to twice (2 × Vbat) the battery voltage. In this embodiment, the voltage at the voltage output terminal Vcco is clamped to be lower than 6V, which can ensure that the power supply voltage of other modules of the airflow sensing apparatus 100 does not exceed 6V, so as to adapt to the 5V platform wafer manufacturing process.
Please refer to fig. 2, which is a schematic diagram of a boost module in the airflow sensing apparatus according to the present invention. The boost module 20 comprises a current source I SW The switch array 201 comprises a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4, wherein the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 are connected in series, one end (namely a CP point) of the cross-over capacitor C is connected with a connection point between the first switch S1 and the second switch S2, the other end (namely a CN point) of the cross-over capacitor C is connected with a connection point between the third switch S3 and the fourth switch S4, and the voltage input end Vbat passes through the current source I SW The connection point between the second switch S2 and the third switch S3 is connected, one end of the first switch S1 is connected to the voltage output terminal Vcco, and one end of the fourth switch S4 is grounded.
The boost module 20 further includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, a comparator 203, a reference voltage source 204, and a logic controller 202. One end of the first voltage-dividing resistor R1 is connected to the voltage output terminal Vcco, the other end of the first voltage-dividing resistor R1 is connected to one end of the second voltage-dividing resistor R2, the other end of the second voltage-dividing resistor R2 is grounded, one input end of the comparator 203 is connected to a connection point between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the other input end of the comparator 203 is connected to the reference voltage source 204, the output end of the comparator 203 is connected to one input end of the logic controller 202, the other input end of the logic controller 202 is connected to the enable terminal EN, and the output end of the logic controller 202 is connected to the switch array. It is understood that the logic controller 202 can control the switches in the switch array 201 to be turned on or off according to the signals of the comparator and the enable terminal EN.
When the enable terminal EN is low, the boost module 20 is in the through state operation mode, the switches S1, S2, and S4 are closed, and the switch S3 is open. The positive end of the battery passes through the voltage input end Vbat and the current source I SW And switches S1 and S2 communicate the voltage output terminal Vcco of the boost module 20, and the capacitor C is connected between CP and CN to charge the battery voltage, at this time, the voltage at the voltage output terminal Vcco is approximately the battery voltage. In the through state, other units in the boost module 20, such as the logic controller 202, the comparator 203, and the reference voltage source 204, are all in the micro power consumption mode, and the voltage sampling voltage dividing resistors R1 and R2 connected to the voltage output Vcco are also disconnected from ground, so that the operating current of the boost module 20 can be controlled to about 1 μ a, and the power consumption is extremely low.
When the enable terminal EN is at a high level, the boost module 20 is in a boost state operating mode, and the specific operating principle is as follows:
in the first step, the switches S2 and S4 are opened, the switch S3 is closed, and the switch S1 is closed continuously, so that there is a voltage Vbat across the capacitor C between the CP and CN, the terminal CN is boosted to the battery voltage Vbat by the closing of the switch S3, and the potential at the terminal CP is boosted to twice the battery voltage (2 × Vbat).
In a second step, switches S1 and S3 are opened, switches S2 and S4 are closed, and the battery positive terminal voltage Vbat is passed through a current source I SW The capacitor C is charged between CP and CN for a time period determined by the voltage difference between the positive input terminal and the negative input terminal of the comparator 203. The positive input terminal of the comparator 203 is Vcco × R2/(R1+ R2), and the negative input terminal is the reference voltage V REF . When Vcco is equal to V REF X (R1+ R2)/R2, the boost module 20 outputs a regulated voltage value; if Vcco<V REF X (R1+ R2)/R2, low level of the output of the comparator 203, controlling the switches S1 and S3 to be opened and the switches S2 and S4 to be closed for a maximum value through the logic controller 202; if it isVcco>V REF X (R1+ R2)/R2, high at the output of the comparator 203, controls the switches S1 and S3 to open and the switches S2 and S4 to close for a minimum value via the logic controller 202. It will be appreciated that this state is understood to be absent, and is a gapped operating state when Vcco is approximately equal to V REF (R1+ R2)/R2, the logic controller 202 controls the switch S1 and S3 to be open and the switch S2 and S4 to be closed between the high and low levels of the output terminal of the comparator 203, so that the output voltage of the voltage boost module 20 is approximately equal to V REF X (R1+ R2)/R2 value. In particular, V REF The value of x (R1+ R2)/R2 is typically set to 5V, and when Vbat is below 2.5V, twice the battery voltage (2 x Vbat) remains less than V REF X (R1+ R2)/R2, where Vcco is approximately equal to 2 × Vbat.
Third, switches S2, S4 are open and switches S1, S3 are closed. At this time, there is a voltage I across the capacitor C between CP and CN SW The CN end is boosted to the battery voltage Vbat under the influence of the closing of a switch S3, and the potential of the CP end is boosted to twice the battery voltage Vbat + I SW X Δ t/C. Wherein: the switches S1 and S3 are opened and the switches S2 and S4 are closed for the second step of Δ t, it is clear that the longer Δ t, the greater the output Vcco of the boost module 20, and not more than V REF ×(R1+R2)/R2。
Fourth, the second step state is repeated, switches S1 and S3 are opened, switches S2 and S4 are closed, and the process is repeated.
Further, please refer to fig. 3, which is a control schematic diagram of a switch array in the airflow sensing apparatus according to the present invention. A mode switching unit 205 is connected to the switch array 201, and the mode switching unit 205 controls on/off of switches in the switch array 201 according to a signal of the enable terminal EN. Specifically, a first output terminal of the mode switching unit 205 is connected to the first switch S1, a first output terminal of the mode switching unit 205 is connected to the third switch through a first inverter X503, a second output terminal of the mode switching unit 205 is connected to the second switch S2 through a second inverter X506, and a second output terminal of the mode switching unit 205 is connected to the fourth switch S4.
The mode switching unit 205 includes a nand gate X501, an inverter X502, an inverter X504, and a nand gate X506. The boost mode switch signals IN1 and IN2 are respectively input to one input of the nand gate X501 and the inverter X504 IN the mode switching unit 205, the mode switching control signal (i.e., the enable end EN) is input to the other input of the nand gate X501 and one input of the nand gate X505, the output signal of the nand gate X501 passes through the inverter X502 to control the switch S1 and then through the inverter X502 to control the switch S3, the output signal of the inverter X504 is sent to the other input of the nand gate X505, the output signal thereof passes through the switch S4 and then through the inverter X506 to control the switch S2. Specifically, when the mode switching control signal is at a low level, the outputs of the nand gates X501 and X505 are forced to a high level, and then the switch S1, the switch S2, and the switch S4 are forced to be closed, the switch S3 is forced to be opened, the battery positive terminal Vbat flows into the voltage output terminal through the current source ISW, the switch S1, and the switch S2, and at this time, the voltage of the voltage output terminal is approximately equal to the voltage of the battery positive terminal Vbat, and the boost module 20 is in the through-state operation mode. When the mode switching control signal is high, the nand gates X501 and X505 function as inverters and can transmit the switching signals IN1 and IN2 IN the boost mode. The boost module 20 is in a boost state mode of operation.
The sensing module 30 is specifically an airflow sensor, the sensing module 30 is powered by Vcco output by the boosting module 20 to detect the change of the airflow, the output of the airflow sensor is sent to the adjusting module 40, the airflow sensor is mostly used in electronic cigarettes, the electronic cigarettes belong to portable articles, power batteries are adopted to supply power, switches for disconnecting power supplies are not provided, the standby power consumption requirement is extremely high, generally, only a few microamperes can be realized, and in the invention, the boosting module 20 is defaulted to work in a direct-connection mode and has extremely low power consumption. Please refer to fig. 4, which is a schematic diagram of an inductor module of an airflow sensor according to the present invention. The sensing module 30 includes a first oscillator 301, a second oscillator 302, a frequency divider 303 and a counter 304, the first oscillator 301 is connected to an oscillating capacitor C301, the first oscillator 301 is connected to the counter 304 through the frequency divider 303, the second oscillator 302 is connected to an inductive capacitor C302 varying with an air flow, the second oscillator 302 is connected to the counter 304, the counter 304 is connected to the adjusting module 40, and the counter 304 outputs a digital signal to the adjusting module 40.
Further, the lowest working voltage of the sensing module 30 is lower than 2V, the lowest working voltage is 1.8-2V when the power is on, 200-300 mV hysteresis is generated when the power is off, and the highest working voltage is higher than 5V. The first oscillator 301 and the second oscillator 302 are the same in structure, and an oscillating capacitor C301 is connected in the first oscillator 301; the second oscillator 302 is connected to a capacitor C302 whose external air current varies in magnitude. Specifically, for example, the oscillation capacitor C301 is about 2p, the oscillation frequency of the first oscillator 301 is 30kHz, the frequency dividing ratio of the frequency divider 303 is 1024, the counting period of the counter 304 is about 33mS, correspondingly, the capacitance C302 varied by the airflow is also about 2p, the oscillation frequency of the second oscillator 302 is also 30kHz, and the digital signal of the counter 304 outputs 1024 pulses. If the capacitance C302 changed by the airflow is smaller than 2p and the oscillation frequency of the second oscillator 302 is higher than 30kHz, the digital signal of the counter 304 outputs more than 1024 pulses; on the contrary, if the capacitance C302 varied by the magnitude of the airflow is greater than 2p and the oscillation frequency of the second oscillator 302 is lower than 30kHz, the digital signal output of the counter 304 is less than 1024 pulses.
It is understood that when the sensing capacitor C302 is not affected by the airflow, the capacitance value change is very small unless affected by the external force, so that the capacitance C302 change affected by the airflow can be detected by continuously resetting the digital signal output pulse number of the counter 304. For example, when the sensing capacitor C302 is not affected by the airflow, the digital signal output of the counter 304 is more or less than 1024 pulses, which is X, within a period of time, such as 15 seconds, and when the sensing capacitor C302 is affected by the airflow, the digital signal output of the counter 304 is Y, and the magnitude of (X-Y) is used to determine the relative value of the change of the sensing capacitor C302.
Please refer to fig. 5, which is a circuit diagram of a second oscillator in the airflow sensing apparatus according to the present invention. In fig. 5, PMOS transistors P601 to P604, NMOS transistors N601 to N604, and a second bias current source I602 form a comparator, PMOS transistors P601 and P602 are a differential pair, PMOS transistors P603 and P604, NMOS transistors N601 and N602, and NMOS transistors N603 and N604 form three pairs of mirror current sources. The grid of the PMOS tube P602 is a negative input end and is connected with a constant voltage V1, the grid of the PMOS tube P601 is a positive input end and is connected with a charging current and an internal oscillation capacitor C602 which are taken as first bias current sources I601, and is connected with a discharging loop and an external oscillation capacitor C601 through a resistor R601, and the discharging loop is composed of the resistor R602 and an NMOS tube N605 which are taken as switches. The NMOS tube N605 is used as the output of the switch-controlled Schmidt in-phase device X601, the input of the Schmidt in-phase device X601 is connected with the output of the comparator, and the capacitor C603 is used for eliminating the peak noise wave output by the comparator. For example, by setting the constant voltage V1 to 0.6V and the first bias current source I601 and the second bias current source I602 to 200nA, the consumption current of the second oscillator can be controlled not to exceed 500nA, and thus the second oscillator can operate at 1.8V or less. It can be understood that the first oscillator and the second oscillator have the same structure, and the consumption current of the first oscillator does not exceed 500nA, and the first oscillator can work under 1.8V.
Please refer to fig. 6, which is a circuit diagram of an inductor module of an airflow sensor according to the present invention. In fig. 6, PMOS transistors P701 and P702 and a resistor R701 form a start-up path, and the PMOS transistors P701 and P702 are transistors with extremely long channels, forming an ultra-large resistor, which reaches tens of M Ω. The NMOS transistors N701 and N702 constitute a mirror current source, and the current flowing through the drain is about 100 nA. Specifically, the gate of the NMOS transistor N704 is connected to a power supply voltage Vcco, the NMOS transistor N706 and the resistor R702 have a very small current flowing, which is less than 100nA, so that the drains of the PMOS transistors P703 and P704 have a very small current flowing, the PMOS transistors P703 and P704, and P705 and P706 constitute a mirror current source, which raises the gate potential of the NMOS transistor N707, which is equal to a PN junction voltage (about 0.6V) plus a turn-on voltage (about 0.5V) of the NMOS transistor, so that the gate potential of the NMOS transistor N707 is also raised, the resistor R702 has a larger current flowing, which is about a PN junction voltage (about 0.6V) divided by the resistance of the resistor R702, the NMOS transistor N706 is turned off, and the drains of the PMOS transistors P703 and P704 have a larger current flowing. The PMOS transistors P707, P708, P709 and P710 and the PMOS transistors P703 and P704 also constitute mirror current sources, and the first mirror current source I701 and the second mirror current source I702 are constant current sources. For example, we set 200nA or so, and change the size of the resistor R702 can be the constant current source size. In conjunction with fig. 5, the first mirrored current source I701 is equal to the first bias current source I601, and the second mirrored current source I702 is equal to the second bias current source I602.
Further, fig. 6 also includes a power-on delay reset circuit, a PMOS transistor P721 and a resistor R721 form a start-up path of the power-on delay reset circuit, and the PMOS transistor P721 is a transistor with a very long channel, forming a very large resistor, which reaches tens of M Ω. The NMOS transistor N722 is a reset switch, and its gate is controlled by the output of the schmidt non-inverting amplifier X701. The input end of the Schmidt non-inverting input device X701 is connected with the grid electrode and the drain electrode of the PMOS pipe P703, and the input end of the Schmidt non-inverting input device X701 is divided by the starting voltage (about 0.5V) of the PMOS pipe P703 from Vcco. The capacitor C721 is charged by the PMOS transistor P721, so that the output end of the Mitt non-inverting amplifier X721 is switched from low level to high level.
Please refer to fig. 7, which is a waveform diagram of power-on, reset, bias current and oscillation output signals of an induction module in an airflow sensing apparatus according to the present invention. The four waveforms in fig. 7 respectively supply the power-up and power-down timing of the voltage Vcco, the delayed reset loop output Vrst, the charging current I601 of the second oscillator, and the signal output of the second oscillator. Specifically, a power supply voltage Vcco is electrified for 2V starting; when Vcco is electrified for 2-5V, the charging current I601 of the second oscillator is constant; the signal output of the second oscillator is present.
The adjusting module 40 is powered by the Vcco output of the boosting module 20, has adjustment of more than two sensitivity thresholds, and receives an EN signal output by the sensing unit 30 to control the boosting module 20 to switch from the direct-through operation mode to the boosting operation mode when the output of the sensing unit crosses a first sensitivity threshold (i.e., a first preset threshold), and switches from the low level to the high level to output the output OUT when the output of the sensing unit crosses a second sensitivity threshold (i.e., a second preset threshold). Specifically, the first sensitivity threshold is smaller than the second sensitivity threshold, and the sensitivity and the high stability of the airflow sensor can be ensured by setting the first sensitivity threshold and the second sensitivity threshold. It will be appreciated that the adjustment module 40 may be provided with further sensitivity thresholds, such as a third, fourth or further sensitivity threshold, which must be larger than the first sensitivity threshold, independent of the size of the second sensitivity threshold, which may be used to control the output power or taste of the e-cigarette, etc.
Please refer to fig. 8, which is a schematic diagram of a conditioning module in the airflow sensing apparatus according to the present invention. The adjusting module 40 includes a first determining unit 401 and a second determining unit 402, where the first determining unit 401 and the second determining unit 402 receive the digital signal output by the counter 304, the first determining unit 401 is connected to the enable terminal EN, the first determining unit 401 controls the level of the enable terminal EN according to the digital signal, and the second determining unit 402 controls the level output by the adjusting module 40 according to the digital signal.
The lowest working voltage of the regulating module 40 is lower than 2V, the lowest working voltage is 1.8-2V during power-on generally, 200-300 mV hysteresis exists during power-off, and the highest working voltage is higher than 5V. First discrimination section 401 and second discrimination section 402 discriminate digital signals output from counter 304, respectively. For example, the first preset threshold is set to Z1, the second preset threshold is set to Z2, and Z1< Z2. Then, with reference to fig. 4, when (X-Y) ≧ Z1, the determining unit 401 determines that the airflow inducts to cross the first sensitivity threshold Z1, and its output EN controls the boost module 20 to switch from the direct-through mode to the boost mode; when (X-Y) ≧ Z2, the second determination unit 402 determines that the airflow sensor crosses the second sensitivity threshold Z2, and controls the output high level.
Further, the adjusting module 40 further includes a supply voltage detecting unit 403 connected to the second determining unit 402, the supply voltage detecting unit 403 is further connected to the voltage output terminal Vcco, and when the voltage of the voltage output terminal Vcco is smaller than a preset undervoltage protection threshold, the supply voltage detecting unit 403 controls the second determining unit 402 to turn off the output of the adjusting module. It is understood that the supply voltage detecting unit 403 is configured to detect the output Vcco of the charge pump boosting module 20, and turn off the output OUT of the second determining unit 402 when the output Vcco is lower than the set undervoltage protection threshold. Specifically, the set under-voltage protection threshold has a large hysteresis characteristic, for example, the set under-voltage protection threshold is 3.8V, the corresponding battery voltage is approximately 1.9-2V, and the hysteresis value of the under-voltage protection threshold is set to be 400-500 mV. This has two benefits: firstly, setting a battery under-voltage protection value of the airflow sensor; when the battery of the electronic cigarette manufactured by the second airflow sensor is close to the under-voltage protection value, the feeling of unsmooth smoking cannot occur, and either smoking is allowed or not allowed.
The airflow sensing device and the electronic cigarette device provided by the invention have simple circuits and are easy to integrate, the airflow sensing device can be powered by a single lithium iron phosphate battery and can work in a 2-4V power supply range, the charge pump boosting module contained in the airflow sensing device has two through working modes, namely a through working mode and a boosting working mode, when no current changes, the charge pump boosting unit works in the through working mode and has extremely low power consumption, the adjusting module 40 has adjustment of more than two sensitivity thresholds, when the output of the sensing unit crosses a first sensitivity threshold, the charge pump boosting module is converted from the through working mode to the boosting working mode, and when the output of the sensing unit crosses a second sensitivity threshold, the output of the charge pump boosting module is converted from a low level to a high level to be output, so that the high stability of the sensitivity of the airflow sensing device is realized.
The invention also provides an electronic cigarette device comprising the airflow sensing device in any one of the above embodiments. It is understood that all embodiments of the airflow sensing device provided by the present invention are applicable to the electronic cigarette device provided by the present invention, and can achieve the same or similar technical effects.
In summary, in the airflow sensing device and the electronic cigarette device provided by the present invention, the sensing module 30 can transmit the sensed airflow variation to the adjusting module 40, the adjusting module 40 can enable the boosting module 20 according to the airflow variation, the boosting module 20 has two working states, i.e. a through state and a boosting state, a first preset threshold and a second preset threshold are disposed in the adjusting module 40, when the airflow variation is smaller than the first preset threshold, the adjusting module 40 enables the boosting module 20 to be in the through state, and the adjusting module 40 outputs a low level, when the airflow variation sensed by the sensing module 30 increases to exceed the first preset threshold, the boosting module 20 is switched from the through state to the boosting state, the adjusting module 40 still defaults to output the low level, and when the airflow variation continues to increase to exceed the second preset threshold, the adjusting module 40 outputs a high level, so designed, a battery with a lower working voltage can be used, the cost is lower, the power consumption is extremely low under the static state, the sensitivity of the airflow change induction is ensured, and the stability of the airflow sensing device is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An airflow sensing device is characterized by comprising a battery, a boosting module, an induction module and a regulating module; the battery is connected with a voltage input end of the boosting module, a voltage output end of the boosting module is connected with the sensing module and the adjusting module, the sensing module is connected with the adjusting module, the sensing module is used for sensing airflow change and transmitting the sensed airflow change to the adjusting module, the adjusting module is connected with an enabling end of the boosting module, and the adjusting module enables the boosting module to be in a through state or a boosting state according to the airflow change.
2. The airflow sensing device according to claim 1, wherein when the airflow variation is smaller than a first preset threshold, the regulating module enables the boost module to be in a pass-through state, the battery directly supplies power to the sensing module and the regulating module without being boosted by the boost module, and the regulating module outputs a low level;
when the airflow change is larger than or equal to the first preset threshold and smaller than a second preset threshold, the regulating module enables the boosting module to be in a boosting state, the battery supplies power to the induction module and the regulating module after being boosted by the boosting module, and the regulating module outputs a low level;
when the airflow change is larger than or equal to the second preset threshold value, the regulating module enables the boosting module to be in a boosting state, the battery supplies power to the sensing module and the regulating module after being boosted by the boosting module, and the regulating module outputs a high level.
3. The airflow sensing device according to claim 1, wherein the boost module comprises a current source, a switch array and a crossover capacitor, the switch array comprises a first switch, a second switch, a third switch and a fourth switch, the first switch, the second switch, the third switch and the fourth switch are connected in series, one end of the crossover capacitor is connected to a connection point between the first switch and the second switch, the other end of the crossover capacitor is connected to a connection point between the third switch and the fourth switch, the voltage input end is connected to a connection point between the second switch and the third switch through the current source, one end of the first switch is connected to the voltage output end, and one end of the fourth switch is grounded.
4. The airflow sensing device of claim 3 wherein said boost module further comprises a first voltage divider resistor, a second voltage divider resistor, a comparator, a reference voltage source, and a logic controller; one end of the first voltage-dividing resistor is connected with the voltage output end, the other end of the first voltage-dividing resistor is connected with one end of the second voltage-dividing resistor, the other end of the second voltage-dividing resistor is grounded, one input end of the comparator is connected with a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor, the other input end of the comparator is connected with the reference voltage source, the output end of the comparator is connected with one input end of the logic controller, the other input end of the logic controller is connected with the enable end, and the output end of the logic controller is connected with the switch array.
5. The airflow sensing device according to claim 1, wherein the sensing module comprises a first oscillator, a second oscillator, a frequency divider, and a counter, the first oscillator is connected to an oscillating capacitor, the first oscillator is connected to the counter through the frequency divider, the second oscillator is connected to a sensing capacitor that varies with airflow, the second oscillator is connected to the counter, the counter is connected to the adjusting module, and the counter outputs a digital signal to the adjusting module.
6. The airflow sensing device according to claim 5, wherein the adjusting module includes a first determining unit and a second determining unit, the first determining unit and the second determining unit receive the digital signal output by the counter, the first determining unit is connected to the enable terminal, the first determining unit controls the level of the enable terminal according to the digital signal, and the second determining unit controls the level of the output by the adjusting module according to the digital signal.
7. The airflow sensing device according to claim 6, wherein said adjusting module further comprises a supply voltage detecting unit connected to said second determining unit, said supply voltage detecting unit is further connected to said voltage output terminal, and when the voltage at said voltage output terminal is smaller than a preset undervoltage protection threshold, said supply voltage detecting unit controls said second determining unit to turn off the output of said adjusting module.
8. The airflow sensing device as claimed in claim 3, wherein a mode switching unit is connected to said switch array, said mode switching unit controlling on/off of switches in said switch array according to a signal of said enable terminal; the first output end of the mode switching unit is connected with the first switch, the first output end of the mode switching unit is connected with the third switch through a first phase inverter, the second output end of the mode switching unit is connected with the second switch through a second phase inverter, and the second output end of the mode switching unit is connected with the fourth switch.
9. The airflow sensing device of claim 6 wherein the lowest operating voltage of said first and second oscillators is less than 1.8V.
10. An electronic vaping device, comprising an airflow sensing device according to any of claims 1 to 9.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150313284A1 (en) * | 2012-10-05 | 2015-11-05 | Smart Chip Microelectronic Co. Limited | Electronic smoke apparatus |
| CN105955094A (en) * | 2015-12-25 | 2016-09-21 | 深圳瀚星翔科技有限公司 | Power regulation control circuit of electronic cigarette |
| CN107373759A (en) * | 2017-07-21 | 2017-11-24 | 深圳市新宜康电子技术有限公司 | The startup method that electronic smoke atomizer quickly heats |
| CN108294363A (en) * | 2017-01-12 | 2018-07-20 | 常州市派腾电子技术服务有限公司 | The control method of electronic cigarette and electronic smoke atomizer power |
| CN209251760U (en) * | 2018-11-23 | 2019-08-16 | 深圳市海派特光伏科技有限公司 | Electronic cigarette circuit and electronic cigarette |
| CN112821762A (en) * | 2021-04-16 | 2021-05-18 | 深圳市拓尔微电子有限责任公司 | Control circuit and booster circuit |
| CN213785384U (en) * | 2020-09-30 | 2021-07-27 | 无锡市晶源微电子有限公司 | Electronic cigarette and stepless airflow induction device for same |
-
2022
- 2022-07-12 CN CN202210818265.7A patent/CN115067577B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150313284A1 (en) * | 2012-10-05 | 2015-11-05 | Smart Chip Microelectronic Co. Limited | Electronic smoke apparatus |
| CN105955094A (en) * | 2015-12-25 | 2016-09-21 | 深圳瀚星翔科技有限公司 | Power regulation control circuit of electronic cigarette |
| CN108294363A (en) * | 2017-01-12 | 2018-07-20 | 常州市派腾电子技术服务有限公司 | The control method of electronic cigarette and electronic smoke atomizer power |
| CN107373759A (en) * | 2017-07-21 | 2017-11-24 | 深圳市新宜康电子技术有限公司 | The startup method that electronic smoke atomizer quickly heats |
| CN209251760U (en) * | 2018-11-23 | 2019-08-16 | 深圳市海派特光伏科技有限公司 | Electronic cigarette circuit and electronic cigarette |
| CN213785384U (en) * | 2020-09-30 | 2021-07-27 | 无锡市晶源微电子有限公司 | Electronic cigarette and stepless airflow induction device for same |
| CN112821762A (en) * | 2021-04-16 | 2021-05-18 | 深圳市拓尔微电子有限责任公司 | Control circuit and booster circuit |
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