CN110250573B - Novel electronic cigarette control system - Google Patents
Novel electronic cigarette control system Download PDFInfo
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- CN110250573B CN110250573B CN201910423807.9A CN201910423807A CN110250573B CN 110250573 B CN110250573 B CN 110250573B CN 201910423807 A CN201910423807 A CN 201910423807A CN 110250573 B CN110250573 B CN 110250573B
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- power supply
- nmos tube
- capacitor
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- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 230000000391 smoking effect Effects 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims description 11
- 239000003985 ceramic capacitor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000889 atomisation Methods 0.000 abstract description 3
- 238000012827 research and development Methods 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 238000013461 design Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention provides a novel electronic cigarette control system, when a user smokes, an airflow sensor SW is closed to enable a VDD (virtual ground) controlled by a switch to be connected with an SN, a MOS (metal oxide semiconductor) tube Q1 is driven to enable a voltage value of a GATE end of an MCU to be increased, so that the MCU starts to execute atomization operation, meanwhile, a capacitor C1 of a bootstrap circuit can continuously supply power to a switch control module, the airflow sensor SW and the MOS tube, and a logic control module cuts smoking actions of the user, namely, pulse waves with the duty ratio of 99% are adopted for modulation. The bootstrap capacitor in the circuit is replaced by one thousandth of the existing universal capacity, so that the production cost of the system is reduced, the wiring pressure of the circuit can be relieved, the circuit has little change on the existing circuit while the perfect circuit function is realized, a plurality of circuit modules do not need to be redesigned, and the research and development cost of projects is reduced.
Description
Technical Field
The invention relates to the field of electronics, in particular to an electronic cigarette control system.
Background
The design of the electronic cigarette is continuously improved and innovated, the circuit of the electronic cigarette switch control and the MCU is shown in figure 1, the airflow sensor SW is closed to enable the VDD and the SN of the switch control to be connected when a user smokes by introducing the bootstrap capacitor, the MOS tube Q1 is driven to enable the voltage value of the GATE end of the MCU to be increased, the MCU starts to execute atomization operation, and meanwhile, the capacitor C1 can continuously supply power to the switch control module, the airflow sensor SW and the MOS tube due to the existence of the bootstrap circuit, so that the normal operation of the whole system is maintained. The design scheme not only ensures that the connection line between the switch control part and the MCU part of the circuit is changed from three lines of the traditional electronic cigarette to two lines, but also can reduce the circuit design in the switch control without a constant current source, and only needs to add a switch between VDD and SN, and meanwhile, the GATE end of the MCU detects whether a voltage signal exists or not, and the requirement on the MCU is lower.
However, this design still has a serious problem, when the user performs the smoking action, the bootstrap capacitor C1 needs to supply power to the airflow detection switch SW, the switch control module and the MOS transistor Q1 at the same time, and as known from calculation and actual verification, the capacitor exceeding 22uF is required to maintain the on time above 5S, the design and the size of the electronic cigarette determine that the electrolytic capacitor cannot be used, and the ceramic capacitor with such a capacitance is often packaged to 0805 or more and has a high price, so that the PCB design and the product cost control have problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a novel electronic cigarette control system, which cuts the smoking action of a user on the basis of inheriting the advantages of the existing electronic cigarette control circuit, namely, adopts pulse waves with the duty ratio of 99% to modulate at 1kHz, so that the bootstrap capacitor in the circuit can be replaced by 22uF to be even lower than 22nF, the capacitor with the capacitor value is low in price and small in packaging size, and the circuit area is reduced and the production cost is reduced during design and production.
The technical scheme adopted for solving the technical problems is as follows:
the novel electronic cigarette control system comprises a switch control module, a logic control module, an MCU module, a reverse isolation module and peripheral components, wherein the peripheral components comprise a direct-current power supply, a fixed-value resistor R1, an NMOS tube Q1, a switch SW and an nF-level ceramic capacitor C1; the direct current power supply is directly connected to the two sides of VDD and GND of the MCU module to supply power to the MCU module; the negative electrode of the direct current power supply is respectively connected to the GATE end of the MCU, the GND end of the switch control module and the source end of the NMOS tube Q1 after passing through the constant value resistor R1; the positive electrode of the direct current power supply is connected with the drain end of the NMOS tube Q1 and is connected to the VDD end of the switch control module through the reverse isolation module; the switch control module is internally provided with a switch which is connected with the VDD and the logic control module, and the switch of the logic control module is connected with a pin SN of the switch control module and is controlled by the on-off state of the SW; the pin SN of the switch control module is connected to the gate end of the MOS tube Q1 through the logic control module; the switch SW is an airflow detection switch, a default switch is opened, and when airflow passes through the switch SW, the switch is closed; the switch in the switch control module is opened by default, and when the SW is closed, the VDD and the SN are communicated; the logic control module is connected between the switch control module and the NMOS tube Q1, and when a user smokes, the logic control module cuts an electric signal generated by smoking action, and modulates the NMOS tube by adopting a pulse wave signal with the duty ratio of 99% at 1 kHz.
After the novel electronic cigarette control system is electrified, the direct current power supply supplies power to the whole circuit, the electronic cigarette control system enters a standby mode, at the moment, the SW is opened by default, the VDD and the SN in the switch control are disconnected, the MOS tube Q1 is in a disconnected state, the direct current power supply is connected to the two ends of the capacitor C1 to charge the capacitor, and the potential of the GATE end of the MCU is zero.
When a user smokes, SW takes effect, a switch in the switch control module is closed to connect VDD and SN together, the potential of SN rises to drive the NMOS tube Q1 through logic control, after the NMOS tube Q1 is closed at the moment, the positive electrode of the direct current power supply is directly connected to the fixed value resistor R1, GND of the switch control and the low potential end of the capacitor C1, the voltage of the high potential end of the capacitor C1 further rises to supply power for the switch control module, and meanwhile, the potential of the grid electrode of the NMOS end rises to twice the voltage of the direct current power supply and is higher than the voltage of the source electrode, and the NMOS tube Q1 is continuously driven to work.
In the working process, the logic control module continuously performs the switching control of the circuit, and cuts the electric signal generated by one smoking action of a user for thousands of times, namely, the on-off of the NMOS tube Q1 is controlled by a pulse wave signal with the duty ratio of 99%, and the power supply is charged for C1 when the NMOS tube Q1 is turned off.
The invention has the advantages that the bootstrap capacitor in the circuit can be replaced by one thousandth of the existing universal capacity through the connection and working modes, the production cost of the system is reduced, the wiring pressure of the circuit can be relieved, the circuit has little change on the existing circuit while realizing perfect circuit function, a plurality of circuit modules do not need to be redesigned, and the research and development cost of projects is reduced.
Drawings
Fig. 1 is a schematic diagram of a connection between a conventional electronic cigarette switch control and an MCU.
Fig. 2 is a schematic diagram of connection between the switch control of the electronic cigarette and the MCU of the present invention, wherein the dashed box is an IC internal structure.
Fig. 3 is a switching waveform diagram of a MOS transistor in the operation of the conventional electronic cigarette.
Fig. 4 is a graph of capacitance voltage during operation of the conventional electronic cigarette.
Fig. 5 is a waveform diagram of a MOS transistor switch when the electronic cigarette of the present invention is in operation.
Fig. 6 is a graph of capacitance voltage during operation of the electronic cigarette of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The invention designs a novel connection control mode between the switch control and the MCU by introducing the design of the bootstrap circuit, so that the capacitance of the bootstrap capacitor required in the existing circuit is reduced to one thousandth of that required in the prior art.
A novel electronic cigarette control system is shown in FIG. 2, and comprises a switch control module, a logic control module, an MCU module, a reverse isolation module and corresponding peripheral components, wherein the peripheral components comprise a direct current power supply, a constant value resistor R1, an NMOS tube Q1, a switch SW and an nF-level ceramic capacitor C1; the direct current power supply is directly connected to the two sides of VDD and GND of the MCU module to supply power to the MCU module; the negative electrode of the direct current power supply is respectively connected to the GATE end of the MCU, the GND end of the switch control module and the source end of the NMOS tube Q1 after passing through the constant value resistor R1; the positive electrode of the direct current power supply is connected with the drain end of the NMOS tube Q1 and is connected to the VDD end of the switch control module through the reverse isolation module; the switch control module is internally provided with a switch which is connected with the VDD and the logic control module, and the switch of the logic control module is connected with a pin SN of the switch control module and is controlled by the on-off state of the SW; the pin SN of the switch control module is connected to the gate end of the MOS tube Q1 through the logic control module; the switch SW is an airflow detection switch, a default switch is opened, and when airflow passes through the switch SW, the switch is closed; the switch in the switch control module is opened by default, and when the SW is closed, the VDD and the SN are communicated; the logic control module is connected between the switch control module and the NMOS tube Q1, and cuts an electric signal generated by smoking action when a user smokes, and modulates the NMOS tube by adopting a pulse wave signal with the duty ratio of 99% at 1kHz, so that the nF-level ceramic capacitor C1 can be used; the nF-stage ceramic capacitor C1 is a bootstrap capacitor, the C1 is connected between VDD and GND of the switch control module, and the switch control module is powered when the circuit works.
After the novel electronic cigarette control system is electrified, the direct current power supply supplies power to the whole circuit, the electronic cigarette control system enters a standby mode, at the moment, the SW is opened by default, the VDD and the SN in the switch control are disconnected, the MOS tube Q1 is in a disconnected state, the direct current power supply is connected to the two ends of the capacitor C1 to charge the capacitor C1, no current loop exists, the fixed resistor R1 does not generate voltage drop, and therefore the potential of the GATE end of the MCU is zero.
When a user smokes, SW takes effect, a switch in the switch control module is closed to connect VDD and SN together, the potential of SN rises to drive the NMOS tube Q1 through logic control, after the NMOS tube Q1 is closed at the moment, the positive electrode of the direct current power supply is directly connected to the fixed value resistor R1, GND of the switch control and the low potential end of the capacitor C1, the voltage of the high potential end of the capacitor C1 further rises due to the existence of the reverse isolation module to supply power for the switch control module, and meanwhile, the potential of the grid electrode of the NMOS end rises to twice the voltage of the direct current power supply and is higher than the voltage of the source electrode to continuously drive the NMOS tube Q1 to work.
In the working process, the logic control module continuously performs the switch control of the circuit, and cuts the electric signal generated by one smoking action of the user thousands times, namely, controls the on-off of the NMOS tube Q1 through the pulse wave signal with the duty ratio of 99%, as shown in the figure 5, when the NMOS tube Q1 is turned off, the power supply is charged for C1, and the atomization is normally performed within the time of turning on the Q1. The capacitor of the nF stage can be charged within 1 permillage of the turn-off time of Q1; meanwhile, as one smoking action (about 3-5 s) is divided thousands times, the nF-level capacitor can stably supply power for the NMOS tube Q1 and the test staff control module of the circuit within 3-5 ms of the circuit conduction.
As shown in fig. 2, the whole circuit includes a power supply P1, a switch control module, an MCU, a reverse isolation module, a capacitor C1, an NMOS transistor Q1, a logic control, a switch SW, a fixed resistor R1 and corresponding connection lines. The power supply Q1 is a dc power supply, and is usually a rechargeable lithium battery in practical application of the electronic cigarette; the main function of the reverse isolation module is to allow current to flow from the power supply to the switch controlled VDD terminal, but not back. The switch SW is an airflow detection switch, and the default switch is open and closed when airflow exceeding a threshold passes. The switch control module is internally provided with another switch which is connected between VDD and SN and is used for driving the switch of the MOS tube Q1 through logic control, wherein the logic control transmits a preset high duty ratio pulse wave in the smoking process of a user.
The specific connection mode of the circuit is as follows: the positive electrode of the direct current power supply P1 is directly connected with the VDD end of the MCU module and the drain end of the MOS tube Q1, and is simultaneously connected with the VDD end of the switch control module and one end of the capacitor C1 after passing through the reverse isolation module; the negative electrode of the power supply P1 is directly connected with the GND end of the MCU, and is simultaneously connected with the GATE end of the MCU, the source end of the MOS tube Q1, the GND end of the switch control module and the other side of the capacitor C1 after passing through the constant value resistor R1; the switch SW is connected with the switch control module; the SN pin of the switch control is connected with the grid electrode of the MOS tube Q1 through logic control. For convenience of explanation, three voltage mark points are marked in the figure and are respectively marked as (1), (2) and (3).
After the circuit connection is completed, the direct current power supply P1 supplies power to the whole circuit system, the power supply voltage value is recorded as V, and at the moment, the VDD and the GND of the MCU are directly connected with the positive electrode and the negative electrode of the power supply, and enter a standby state; since there is no user smoking action at this time, SW is turned off by default, the switch control internal switch is turned off, VDD is connected to SN bit, i.e., SN potential is low, and Q1 is turned on. Since no current passes, the voltage drop across the fixed resistor R1 is zero, and therefore the voltages at the three marked points in the graph are respectively: (1) =v, (2) =v, (3) =0. Since the GATE terminal voltage of the MCU is equal to the voltage value at (3), the MCU will not perform the atomizing operation at this time.
When a user starts smoking, the generated air flow enables the switch SW to be closed, at the moment, the switch arranged in the switch control module is closed, VDD is connected with SN, the SN potential is increased, the MOS tube is driven, and the Q1 is closed. At this time, the potential at (3) is equal to the voltage value V of the power supply P1, that is, the GATE terminal voltage value of the MCU becomes V, and the MCU starts to drive the e-cigarette to atomize when detecting the voltage value. Meanwhile, the potential of the lower side of the capacitor C1 becomes V, the potential of the upper side of the capacitor C can rise to 2*V because the voltage value of the capacitor cannot be suddenly changed, namely the potential of the position (2) becomes 2*V, and the discharging path on the capacitor C1 can only pass through the switch control module because of the existence of reverse isolation, and the potential of the SN is further increased and still higher than the potential of the source stage of the MOS tube, so that the SN can continuously drive the Q1. At this time, the logic control continuously generates a pulse wave with a preset high duty ratio, for example, a pulse wave with a frequency of 1kHz and a duty ratio of 95%. When the signal is high, the logic control equivalent is a passage, the SN pin is allowed to drive the MOS tube Q1, when the signal is low, the equivalent is a disconnection, the SN can not drive the Q1, and at the moment, the direct current power supply recharges the capacitor C.
When the user finishes smoking, the switch SW is opened, the switch arranged in the switch control module is opened again, the SN potential is changed to 0, the MOS tube is not driven any more, the state of each point is changed back to the state before smoking starts, the MCU does not drive the atomizer to work, and the system enters the standby state again.
Fig. 3 and fig. 5 show the waveforms of the MOS transistor switch when the electronic cigarette and the electronic cigarette of the present invention work, the waveforms can show the actual output situation of the electronic cigarette, fig. 4 and fig. 6 show the capacitance voltage curves of two different designs, because the pulse wave signal sent by the logic control of the present invention makes the capacitance supplement power thousands times in one second, the power supply needed in the use process of the user can be ensured by using the extremely small capacitance, meanwhile, the feeling of the user in the use process is basically consistent with the previous scheme by using the relatively high duty ratio signal, the switching speed of the frequency is far greater than the human perceptible range, the user can not perceive the switch of the system, and in combination, the present invention effectively reduces the capacitance value needed in the use experience which is the same as the user.
Claims (1)
1. A novel electronic cigarette control system is characterized in that:
the novel electronic cigarette control system comprises a switch control module, a logic control module, an MCU module, a reverse isolation module and peripheral components, wherein the peripheral components comprise a direct-current power supply, a fixed-value resistor R1, an NMOS tube Q1, a switch SW and an nF-level ceramic capacitor C1; the direct current power supply is directly connected to the two sides of VDD and GND of the MCU module to supply power to the MCU module; the negative electrode of the direct current power supply is respectively connected to the GATE end of the MCU, the GND end of the switch control module and the source end of the NMOS tube Q1 after passing through the constant value resistor R1; the positive electrode of the direct current power supply is connected with the drain end of the NMOS tube Q1 and is connected to the VDD end of the switch control module through the reverse isolation module; the switch control module is internally provided with a switch which is connected with the VDD and the logic control module, and the switch of the logic control module is connected with a pin SN of the switch control module and is controlled by the on-off state of the SW; the pin SN of the switch control module is connected to the gate end of the NMOS tube Q1 through the logic control module; the switch SW is an airflow detection switch, a default switch is opened, and when airflow passes through the switch SW, the switch is closed; the switch in the switch control module is opened by default, and when the SW is closed, the VDD and the SN are communicated; the logic control module is connected between the switch control module and the NMOS tube Q1, and cuts an electric signal generated by smoking action when a user smokes, and modulates the NMOS tube by adopting a pulse wave signal with the duty ratio of 99% and 1 kHz;
after the novel electronic cigarette control system is electrified, the direct current power supply supplies power to the whole circuit, the electronic cigarette control system enters a standby mode, at the moment, SW is opened by default, the VDD and SN pins in the switch control are disconnected, the MOS tube Q1 is in a disconnected state, the direct current power supply is connected to the two ends of the capacitor C1 to charge the capacitor, and the potential of the GATE end of the MCU is zero;
when a user smokes, SW takes effect, a switch in a switch control module is closed to connect VDD and SN together, the potential of SN rises to drive an NMOS tube Q1 through logic control, after the NMOS tube Q1 is closed, the positive electrode of a direct current power supply is directly connected to a constant value resistor R1, GND of the switch control and a low potential end of a capacitor C1, the voltage of a high potential end of the capacitor C1 further rises to supply power for the switch control module, and meanwhile, the potential of a grid electrode of the NMOS end rises to twice the voltage of the direct current power supply and is higher than the voltage of a source electrode to continuously drive the NMOS tube Q1 to work;
in the working process, the logic control module continuously performs the switching control of the circuit, and cuts the electric signal generated by one smoking action of a user for thousands of times, namely, the on-off of the NMOS tube Q1 is controlled by a pulse wave signal with the duty ratio of 99%, and the power supply charges the capacitor C1 when the NMOS tube Q1 is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423807.9A CN110250573B (en) | 2019-05-21 | 2019-05-21 | Novel electronic cigarette control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423807.9A CN110250573B (en) | 2019-05-21 | 2019-05-21 | Novel electronic cigarette control system |
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| CN110250573A CN110250573A (en) | 2019-09-20 |
| CN110250573B true CN110250573B (en) | 2024-02-23 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110677960A (en) * | 2019-11-05 | 2020-01-10 | 西安拓尔微电子有限责任公司 | Flash device quick start circuit and control method |
| CN111614142A (en) * | 2020-05-30 | 2020-09-01 | 杭州尚格半导体有限公司 | Battery module and electronic atomization device |
| CN117277464B (en) * | 2022-12-30 | 2024-05-10 | 无锡市稳先微电子有限公司 | Battery protection circuit, battery pack, electronic device, and mode control method |
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| CN102510605A (en) * | 2011-10-17 | 2012-06-20 | 潘永雄 | Novel LED (light emitting diode) driving circuit |
| WO2015013913A1 (en) * | 2013-07-31 | 2015-02-05 | 吉瑞高新科技股份有限公司 | Overcurrent and overvoltage protection circuit and method for electronic cigarette |
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