CN112841743B - Voltage control protection circuit and method and electronic cigarette - Google Patents
Voltage control protection circuit and method and electronic cigarette Download PDFInfo
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- CN112841743B CN112841743B CN202110106842.5A CN202110106842A CN112841743B CN 112841743 B CN112841743 B CN 112841743B CN 202110106842 A CN202110106842 A CN 202110106842A CN 112841743 B CN112841743 B CN 112841743B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 230000000391 smoking effect Effects 0.000 claims abstract description 24
- 230000003750 conditioning effect Effects 0.000 claims description 46
- 238000005070 sampling Methods 0.000 claims description 14
- 235000019504 cigarettes Nutrition 0.000 description 15
- HCUOEKSZWPGJIM-YBRHCDHNSA-N (e,2e)-2-hydroxyimino-6-methoxy-4-methyl-5-nitrohex-3-enamide Chemical compound COCC([N+]([O-])=O)\C(C)=C\C(=N/O)\C(N)=O HCUOEKSZWPGJIM-YBRHCDHNSA-N 0.000 description 7
- 101001109689 Homo sapiens Nuclear receptor subfamily 4 group A member 3 Proteins 0.000 description 7
- 101000598778 Homo sapiens Protein OSCP1 Proteins 0.000 description 7
- 101001067395 Mus musculus Phospholipid scramblase 1 Proteins 0.000 description 7
- 102100022673 Nuclear receptor subfamily 4 group A member 3 Human genes 0.000 description 7
- 230000001143 conditioned effect Effects 0.000 description 5
- 241000208125 Nicotiana Species 0.000 description 4
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 235000019505 tobacco product Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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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
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
- A24F40/46—Shape or structure of electric heating means
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
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Abstract
The invention relates to the technical field of electronic cigarettes, and discloses a voltage control protection circuit and method and an electronic cigarette. The voltage control protection circuit comprises a control chip, a voltage protection circuit and a driving circuit; when the control chip receives a smoking starting signal, a driving signal is output to the driving circuit according to the smoking starting signal, so that the driving circuit controls the heating wire to heat; the voltage protection circuit samples the voltage value of the driving circuit, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip according to a comparison result; the control chip outputs a PWM duty ratio signal to the drive circuit according to the voltage protection signal so as to prevent the over-temperature of the heating wire. According to the invention, the original control protection circuit design of the electronic cigarette is optimized by adding the voltage protection circuit, the voltage of the driving circuit is controllable in real time, the phenomenon that the taste is influenced or a user is injured due to the over-temperature of the heating wire is avoided, and the fault rate of the electronic cigarette can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to a voltage control protection circuit and method and an electronic cigarette.
Background
With the recent upgrading of consumption and the enhancement of health consciousness of people, novel tobacco products are widely concerned in the tobacco market and hopefully become the next economic growth point of the market. A "low temperature cigarette" designed with the concept of "heat not burn" for a heated non-burning tobacco product can heat the tobacco leaves just enough to emit a flavor without igniting the tobacco leaves. The smoke generated by heating the tobacco leaves in the cartridge or cigarette is sucked by heating the non-combustible cigarette, and is often classified as an atomized product. The advantages of the cigarette are that the pure taste and throat feeling of the cigarette are restored, and a cigarette replacement mode which is most similar to the traditional cigarette is provided for smokers. In the market, most of the heating non-combustion modes are that a cigarette bullet or a cigarette is inserted into a heating needle to be heated from inside to outside, but potential safety hazards exist due to uncontrollable voltage of the heating mode, the mouth feel is affected, and a user can be injured.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a voltage control protection circuit and method and an electronic cigarette, and aims to solve the technical problems that potential safety hazards exist due to uncontrollable voltage in the existing electronic cigarette heating mode, taste is affected, and users are injured.
In order to achieve the above object, the present invention provides a voltage control protection circuit, including: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; the control chip is respectively connected with the voltage protection circuit and the driving circuit, and the voltage protection circuit is connected with the driving circuit; wherein,
the control chip is used for outputting a driving signal to the driving circuit according to the smoking starting signal when receiving the smoking starting signal so as to enable the driving circuit to control the heating wire to heat;
the voltage protection circuit is used for sampling the voltage value of the driving circuit, comparing the voltage value with a preset voltage value and outputting a voltage protection signal to the control chip according to a comparison result;
the control chip is further used for outputting a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the heating wire from being over-temperature.
Optionally, the voltage protection circuit includes an overvoltage protection circuit and an external voltage control circuit; wherein,
the input of overvoltage crowbar with drive circuit's sample end is connected, overvoltage crowbar's output with control chip's signal input part is connected, external voltage control circuit's input is connected with external signal input part, external voltage control circuit's output with overvoltage crowbar's signal input part is connected.
Optionally, the overvoltage protection circuit includes a conditioning circuit, a voltage comparison circuit, a conditioning voltage divider circuit, and a first inverter circuit; wherein,
the input end of the conditioning circuit is connected with the sampling end of the driving circuit, the output end of the conditioning circuit is connected with the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the conditioning voltage division circuit, the output end of the conditioning voltage division circuit is connected with the input end of the first phase inverter circuit, and the output end of the first phase inverter circuit is connected with the signal input end of the control chip.
Optionally, the first inverter circuit comprises a first nor gate; wherein,
the first input end of the first NOR gate is connected with the output end of the conditioning voltage division circuit, the second input end of the first NOR gate is connected with the output end of the external voltage control circuit, and the output end of the first NOR gate is connected with the signal input end of the control chip.
Optionally, the conditioning circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first amplifier; wherein,
the first end of first resistance with drive circuit's sample end is connected, the second end of first resistance with the first end of third resistance is connected, the second end of first resistance with the negative input end of first amplifier is connected, the second end of third resistance with the first end of fifth resistance is connected, the first end of second resistance with drive circuit's sample end is connected, the second end of second resistance with the first end of fourth resistance is connected, the second end ground connection of fourth resistance, the second end of second resistance with the positive input end of first amplifier is connected, the output of first amplifier with the first end of fifth resistance is connected, the second end of fifth resistance with the input of voltage comparison circuit is connected.
Optionally, the external voltage control circuit comprises a signal input circuit and a second inverter circuit; wherein,
the input end of the signal input circuit is connected with the external signal input end, the output end of the signal input circuit is connected with the input end of the second phase inverter circuit, and the output end of the second phase inverter circuit is connected with the signal input end of the overvoltage protection circuit.
Optionally, the signal input circuit comprises a sixth resistor, a seventh resistor and an eighth resistor; wherein,
the first end of the sixth resistor is connected with the external signal input end, the first end of the seventh resistor is connected with the external signal input end, the second end of the sixth resistor is connected with the first end of the eighth resistor, the second end of the seventh resistor is connected with the first input end of the second phase inverter circuit, and the second end of the eighth resistor is connected with the second input end of the second phase inverter circuit.
Optionally, the second inverter circuit comprises a second nor gate; wherein,
and a first input end and a second input end of the second NOR gate are respectively connected with a first output end and a second output end of the signal input circuit, and an output end of the second NOR gate is connected with a signal input end of the overvoltage protection circuit.
To achieve the above object, the present invention also provides a voltage control protection method applied to the voltage control protection circuit as described above, the voltage control protection circuit including: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; the voltage control protection method comprises the following steps:
when the control chip receives a smoking starting signal, a driving signal is output to the driving circuit according to the smoking starting signal, so that the driving circuit controls the heating wire to heat;
the voltage protection circuit samples the voltage value of the driving circuit, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip according to a comparison result;
and the control chip outputs a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the over-temperature of the heating wire.
To achieve the above object, the present invention further provides an electronic cigarette, which includes the voltage control protection circuit as described above, or applies the voltage control protection method as described above.
The technical scheme of the invention provides a voltage control protection circuit, which comprises: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; the control chip is respectively connected with the voltage protection circuit and the driving circuit, and the voltage protection circuit is connected with the driving circuit; the control chip is used for outputting a driving signal to the driving circuit according to the smoking starting signal when receiving the smoking starting signal so as to enable the driving circuit to control the heating wire to heat; the voltage protection circuit is used for sampling the voltage value of the driving circuit, comparing the voltage value with a preset voltage value and outputting a voltage protection signal to the control chip according to a comparison result; the control chip is further used for outputting a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the heating wire from being over-temperature. According to the electronic cigarette, the design of an original control protection circuit of the electronic cigarette is optimized by adding the voltage protection circuit, the voltage of the driving circuit is controlled in real time, the phenomenon that the taste is influenced or a user is injured due to the fact that the heating wire is too hot is avoided, the fault rate of the electronic cigarette can be effectively reduced by adding the voltage protection circuit, and therefore the technical problems that potential safety hazards exist due to the fact that the voltage of an existing electronic cigarette heating mode is not controllable, the taste is influenced and the user is injured due to the fact that the voltage of the existing electronic cigarette heating mode is uncontrollable are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a voltage control protection circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of a voltage control protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a voltage control protection method according to a first embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
2014 | |
| 200 | Voltage protection circuit | NOR1 | First NOR |
| 300 | Driving circuit | R1～R8 | First to |
| 201 | Overvoltage protection circuit | A1 | A |
| 202 | External |
2021 | |
| 2011 | |
2022 | |
| 2012 | Voltage comparison circuit | J | External |
| 2013 | Conditioning voltage division circuit | NOR2 | Second NOR gate |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a voltage control protection circuit.
Referring to fig. 1, in an embodiment of the present invention, the voltage control protection circuit includes: a control chip 100, a voltage protection circuit 200 and a driving circuit 300; the control chip 100 is respectively connected to the voltage protection circuit 200 and the driving circuit 300, and the voltage protection circuit 200 is connected to the driving circuit 300; wherein,
the control chip 100 is configured to output a driving signal to the driving circuit 300 according to the smoking start signal when receiving the smoking start signal, so that the driving circuit 300 controls the heating wire to heat. In this embodiment, the control chip 100 may be a micro control unit, which is also called a microcomputer or a single chip, the main control chip 100 outputs a driving signal to the driving circuit 300 through the main control chip 100 when receiving a smoking start signal, that is, when receiving a smoking instruction of a user, the driving circuit 300 may be a heater driving circuit in an electronic cigarette, so that the driving circuit 300 controls the heater to heat, and the driving circuit 300 may receive the driving signal of the control chip 100, switch on a power supply voltage such as VBAT, and start to output a voltage to the heater.
The voltage protection circuit 200 is configured to sample a voltage value of the driving circuit 300, compare the voltage value with a preset voltage value, and output a voltage protection signal to the control chip 100 according to a comparison result. In this embodiment, the original control protection circuit design of the electronic cigarette is optimized by adding the voltage protection circuit 200, the voltage of the driving circuit 300 is controllable in real time, the voltage protection circuit 200 samples the voltage value of the driving circuit 300, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip 100 according to the comparison result. The comparison result may include that the voltage value is greater than the preset voltage value, that is, the driving circuit 300 is over-voltage, which may cause the heater to be over-temperature, affect the taste and cause the user to be injured.
Specifically, the voltage protection circuit 200 may include an overvoltage protection circuit and an external voltage control circuit; the voltage protection circuit 200 detects the voltage of the driving circuit 300, and compared with the original control protection circuit design of the existing electronic cigarette, a NAND gate circuit, a double rising edge D-type trigger, a phase inverter and the like on an external voltage control circuit path can be adopted, so that the circuit on the voltage protection circuit 200 is further simplified, the reliability of the voltage protection circuit 200 is improved, and the use of devices which are easy to break down is reduced.
The control chip 100 is further configured to output a PWM duty signal to the driving circuit 300 according to the voltage protection signal, so as to prevent the heater from being over-temperature. In this embodiment, the control chip 100 outputs a PWM duty ratio signal to the driving circuit 300 according to the voltage protection signal to prevent the heater from being over-temperature, specifically, when the voltage value is greater than a preset voltage value, the voltage protection signal output by the main control chip reduces the duty ratio to reduce the heating time of the heater in the same period; in addition, when the voltage value is smaller than the preset voltage value, the duty ratio of the voltage protection signal output by the main control chip can be increased to increase the heating time of the heating wire in the same period.
In this embodiment, the voltage control protection circuit may be integrated into an ASIC chip, and the ASIC chip may be applied to an electronic cigarette product, and the ASIC, i.e., an application specific integrated circuit, refers to an integrated circuit designed and manufactured according to the requirements of a specific user and the requirements of a specific electronic system.
This embodiment proposes a voltage control protection circuit, the voltage control protection circuit includes: a control chip 100, a voltage protection circuit 200 and a driving circuit 300; the control chip 100 is respectively connected to the voltage protection circuit 200 and the driving circuit 300, and the voltage protection circuit 200 is connected to the driving circuit 300; the control chip 100 is configured to, when receiving a smoking start signal, output a driving signal to the driving circuit 300 according to the smoking start signal, so that the driving circuit 300 controls the heating wire to heat; the voltage protection circuit 200 is configured to sample a voltage value of the driving circuit 300, compare the voltage value with a preset voltage value, and output a voltage protection signal to the control chip 100 according to a comparison result; the control chip 100 is further configured to output a PWM duty signal to the driving circuit 300 according to the voltage protection signal, so as to prevent the heater from being over-temperature. In this embodiment, optimized the original control protection circuit design of electron cigarette through adding voltage protection circuit, realized real-time controllable to drive circuit's voltage, avoided the heater excess temperature to influence the taste or cause the user injured, add voltage protection circuit and can effectively reduce the fault rate of electron cigarette to the uncontrollable potential safety hazard that exists of voltage of having solved current electron cigarette heating methods influences the taste and still can cause the injured technical problem of user.
Further, referring to fig. 2, the voltage protection circuit 200 includes an overvoltage protection circuit 201 and an external voltage control circuit 202; wherein,
the input end of the overvoltage protection circuit 201 is connected with the sampling end of the driving circuit 300, the output end of the overvoltage protection circuit 201 is connected with the signal input end of the control chip 100, the input end of the external voltage control circuit 202 is connected with the external signal input end J, and the output end of the external voltage control circuit 202 is connected with the signal input end of the overvoltage protection circuit 201.
It should be noted that the voltage protection circuit 200 may include an overvoltage protection circuit 201 and an external voltage control circuit 202; the voltage protection circuit 200 detects the voltage of the driving circuit 300, and compared with the original control protection circuit design of the existing electronic cigarette, a nand gate circuit, a double rising edge D-type flip-flop, a phase inverter and the like on the path of the external voltage control circuit 202 can be adopted, so that the circuit on the voltage protection circuit 200 is further simplified, the reliability of the voltage protection circuit 200 is improved, and the use of devices which are easy to break down is reduced.
Further, with continued reference to fig. 2, the overvoltage protection circuit 201 includes a conditioning circuit 2011, a voltage comparison circuit 2012, a conditioning voltage divider circuit 2013, and a first inverter circuit 2014; wherein,
the input of conditioning circuit 2011 with the sampling end of drive circuit 300 is connected, the output of conditioning circuit 2011 with the input of voltage comparison circuit 2012 is connected, the output of voltage comparison circuit 2012 with the input of conditioning bleeder circuit 2013 is connected, the output of conditioning bleeder circuit 2013 with the input of first phase inverter circuit 2014 is connected, the output of first phase inverter circuit 2014 with the signal input part of control chip 100 is connected.
Specifically, the overvoltage protection circuit 201 samples the voltage value of the driving circuit 300, inputs the voltage value to the conditioning circuit 2011 for signal conditioning, inputs the conditioned voltage signal to the voltage comparison circuit 2012, compares the conditioned voltage signal with a preset voltage value to output an overvoltage control signal, the overvoltage control signal passes through the voltage comparator of the conditioning voltage division circuit 2013, generates a comparison signal and sends the comparison signal to the nor gate circuit in the first phase inverter circuit 2014, and finally outputs the voltage protection signal to the control chip 100. In addition, when the voltage value is too high, the overvoltage protection circuit 201 may generate a voltage exceeding the rated voltage by a certain ratio, and the voltage of the voltage comparator is stepped through the conditioning circuit, so as to change the voltage protection signal output to the control chip 100, so that the voltage of the heater is stepped, and the heater stops working.
Further, with continued reference to fig. 2, the first inverter circuit 2014 includes a first NOR gate NOR1; wherein,
a first input terminal of the first NOR gate NOR1 is connected to the output terminal of the conditioning voltage divider 2013, a second input terminal of the first NOR gate NOR1 is connected to the output terminal of the external voltage control circuit 202, and an output terminal of the first NOR gate NOR1 is connected to the signal input terminal of the control chip 100.
It should be noted that the overvoltage protection circuit 201 samples the voltage value of the driving circuit 300, inputs the voltage value to the conditioning circuit 2011 for signal conditioning, inputs the conditioned voltage signal to the voltage comparison circuit 2012, compares the conditioned voltage signal with a preset voltage value to output an overvoltage control signal, the overvoltage control signal passes through the voltage comparator of the conditioning voltage division circuit 2013 to generate a comparison signal, and sends the comparison signal to the NOR gate circuit in the first inverter circuit 2014, and finally outputs the voltage protection signal to the control chip 100, where the NOR gate circuit in the first inverter circuit 2014 is a first NOR gate NOR1.
Further, with continued reference to fig. 2, the conditioning circuit 2011 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first amplifier A1; wherein,
the first end of the first resistor R1 is connected to the sampling end of the driving circuit 300, the second end of the first resistor R1 is connected to the first end of the third resistor R3, the second end of the first resistor R1 is connected to the negative input end of the first amplifier A1, the second end of the third resistor R3 is connected to the first end of the fifth resistor R5, the first end of the second resistor R2 is connected to the sampling end of the driving circuit 300, the second end of the second resistor R2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, the second end of the second resistor R2 is connected to the positive input end of the first amplifier A1, the output end of the first amplifier A1 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the input end of the voltage comparison circuit 2012.
It should be noted that the overvoltage protection circuit 201 samples the voltage value of the driving circuit 300, inputs the voltage value to the conditioning circuit 2011 for signal conditioning, and the conditioning circuit 2011 outputs a conditioned voltage signal.
Further, with continued reference to fig. 2, the external voltage control circuit 202 includes a signal input circuit 2021 and a second inverter circuit 2022; wherein,
the input end of the signal input circuit 2021 is connected to the external signal input end J, the output end of the signal input circuit 2021 is connected to the input end of the second inverter circuit 2022, and the output end of the second inverter circuit 2022 is connected to the signal input end of the overvoltage protection circuit 201.
It should be noted that the input end of the external voltage control circuit 202 is connected to an external signal input end J, an external power control signal is sent to the signal input circuit 2021 through the external signal input end J, sent to the second inverter circuit 2022 through the signal input circuit 2021, and then input to the conditioning voltage-dividing circuit 2013, and the signals respectively input by the overvoltage protection circuit 201 and the external voltage control circuit 202 are compared by the voltage comparator of the conditioning voltage-dividing circuit 2013 to generate a comparison signal, which is sent to the NOR gate in the first inverter circuit 2014, and finally the voltage protection signal is output to the control chip 100, where the NOR gate in the first inverter circuit 2014 is a first NOR gate NOR1.
Further, with continued reference to fig. 2, the signal input circuit 2021 includes a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; wherein,
a first end of the sixth resistor R6 is connected to the external signal input terminal J, a first end of the seventh resistor R7 is connected to the external signal input terminal J, a second end of the sixth resistor R6 is connected to a first end of the eighth resistor R8, a second end of the seventh resistor R7 is connected to the first input terminal of the second inverter circuit 2022, and a second end of the eighth resistor R8 is connected to the second input terminal of the second inverter circuit 2022.
The signal input circuit 2021 may include a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; the input end of the external voltage control circuit 202 is connected to an external signal input end J, and an external power control signal is sent to the signal input circuit 2021 through the external signal input end J and sent to the second inverter circuit 2022 through the signal input circuit 2021.
Further, with continued reference to fig. 2, the second inverter circuit 2022 includes a second NOR gate NOR2; wherein,
a first input end and a second input end of the second NOR gate NOR2 are respectively connected with a first output end and a second output end of the signal input circuit 2021, and an output end of the second NOR gate NOR2 is connected with a signal input end of the overvoltage protection circuit 201.
It should be noted that the input end of the external voltage control circuit 202 is connected to an external signal input end J, an external power control signal is sent to the signal input circuit 2021 through the external signal input end J, and is sent to the second inverter circuit 2022 through the signal input circuit 2021, the second inverter circuit 2022 includes a second NOR gate NOR2, that is, the external power control signal is sent to the second NOR gate NOR2 through the signal input circuit 2021, and then the output signal of the second NOR gate NOR2 is input to the conditioning voltage dividing circuit 2013, and the voltage comparator of the conditioning voltage dividing circuit 2013 compares the signals respectively input by the overvoltage protection circuit 201 and the external voltage control circuit 202, generates a comparison signal and sends the comparison signal to the NOR gate in the first inverter circuit 2014, and finally outputs the voltage protection signal to the control chip 100.
In order to achieve the above object, the present invention further provides a voltage control protection method applied to the voltage control protection circuit, and referring to fig. 3, fig. 3 is a schematic flow chart of a first embodiment of the voltage control protection method according to the present invention, where the voltage control protection circuit includes: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; in this embodiment, the voltage control protection method includes the following steps:
step S10: when receiving a smoking starting signal, the control chip outputs a driving signal to the driving circuit according to the smoking starting signal so that the driving circuit controls the heating wire to heat.
It should be noted that the control chip 100 may be a micro control unit, which is also called a single chip microcomputer or a single chip microcomputer, when the main control chip 100 receives a smoking start signal, that is, when a user smoking instruction is received, the main control chip 100 outputs a driving signal to the driving circuit 300, the driving circuit 300 may be a heater driving circuit in an electronic cigarette, so that the driving circuit 300 controls the heater to heat, and the driving circuit 300 may receive the driving signal of the control chip 100, switch on a power voltage such as VBAT, and start to output a voltage to the heater.
Step S20: the voltage protection circuit samples the voltage value of the driving circuit, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip according to a comparison result.
It is easy to understand that, the original control protection circuit design of the electronic cigarette is optimized by adding the voltage protection circuit 200, the voltage of the driving circuit 300 is controllable in real time, the voltage protection circuit 200 samples the voltage value of the driving circuit 300, compares the voltage value with the preset voltage value, and outputs a voltage protection signal to the control chip 100 according to the comparison result. The comparison result may include that the voltage value is greater than the preset voltage value, that is, the driving circuit 300 is over-voltage, which may cause the heater to be over-temperature, affect the taste and cause the user to be injured.
Specifically, the voltage protection circuit 200 may include an overvoltage protection circuit and an external voltage control circuit; the voltage protection circuit 200 detects the voltage of the driving circuit 300, and compared with the original control protection circuit design of the existing electronic cigarette, a NAND gate circuit, a double rising edge D-type trigger, a phase inverter and the like on an external voltage control circuit path can be adopted, so that the circuit on the voltage protection circuit 200 is further simplified, the reliability of the voltage protection circuit 200 is improved, and the use of devices which are easy to break down is reduced.
Step S30: and the control chip outputs a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the over-temperature of the heating wire.
It should be understood that the control chip 100 outputs a PWM duty ratio signal to the driving circuit 300 according to the voltage protection signal to prevent the heater from being over-temperature, specifically, when the voltage value is greater than a preset voltage value, the voltage protection signal output by the main control chip reduces the duty ratio to reduce the heating time of the heater in the same period; in addition, when the voltage value is smaller than the preset voltage value, the duty ratio of the voltage protection signal output by the main control chip can be increased to increase the heating time of the heating wire in the same period.
In the embodiment, when the control chip receives a smoking starting signal, a driving signal is output to the driving circuit according to the smoking starting signal, so that the driving circuit controls the heating wire to heat; the voltage protection circuit samples a voltage value of the driving circuit, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip according to a comparison result; and the control chip outputs a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the over-temperature of the heating wire. In this embodiment, optimized the original control protection circuit design of electron cigarette through adding voltage protection circuit, realized being controllable in real time to drive circuit's voltage, avoided the heater overtemperature influence taste or caused the user injured, add voltage protection circuit and can effectively reduce the fault rate of electron cigarette to the uncontrollable potential safety hazard that exists of voltage of having solved current electron cigarette heating methods influences the taste and still can cause the injured technical problem of user.
It should be noted that the above-mentioned work flows are only illustrative and do not limit the scope of the present invention, and in practical applications, those skilled in the art may select some or all of them according to actual needs to implement the purpose of the solution of the present embodiment, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the voltage control protection method provided in any embodiment of the present invention, and are not described herein again.
In order to achieve the above object, the present invention further provides an electronic cigarette, which includes the voltage control protection circuit as described above, or applies the voltage control protection method as described above. The specific structure of the voltage control protection circuit refers to the above embodiments, and the specific flow of the voltage control protection method refers to the above embodiments, and since the electronic cigarette adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. a Read Only Memory (ROM)/RAM, a magnetic disk, and an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (8)
1. A voltage controlled protection circuit, comprising: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; the control chip is respectively connected with the voltage protection circuit and the driving circuit, and the voltage protection circuit is connected with the driving circuit; wherein,
the control chip is used for outputting a driving signal to the driving circuit according to the smoking starting signal when receiving the smoking starting signal so as to enable the driving circuit to control the heating wire to heat;
the voltage protection circuit is used for sampling the voltage value of the driving circuit, comparing the voltage value with a preset voltage value and outputting a voltage protection signal to the control chip according to a comparison result;
the voltage protection circuit comprises an overvoltage protection circuit and an external voltage control circuit; the input end of the overvoltage protection circuit is connected with the sampling end of the driving circuit, the output end of the overvoltage protection circuit is connected with the signal input end of the control chip, the input end of the external voltage control circuit is connected with the external signal input end, and the output end of the external voltage control circuit is connected with the signal input end of the overvoltage protection circuit;
the overvoltage protection circuit comprises a conditioning circuit, a voltage comparison circuit, a conditioning voltage division circuit and a first inverter circuit; the input end of the conditioning circuit is connected with the sampling end of the driving circuit, the output end of the conditioning circuit is connected with the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the conditioning voltage division circuit, the output end of the conditioning voltage division circuit is connected with the input end of the first inverter circuit, and the output end of the first inverter circuit is connected with the signal input end of the control chip;
the control chip is further used for outputting a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the heating wire from being over-temperature.
2. The circuit of claim 1, wherein the first inverter circuit comprises a first nor gate; wherein,
the first input end of the first NOR gate is connected with the output end of the conditioning voltage division circuit, the second input end of the first NOR gate is connected with the output end of the external voltage control circuit, and the output end of the first NOR gate is connected with the signal input end of the control chip.
3. The circuit of claim 2, wherein the conditioning circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first amplifier; wherein,
the first end of the first resistor is connected with the sampling end of the driving circuit, the second end of the first resistor is connected with the first end of the third resistor, the second end of the first resistor is connected with the negative input end of the first amplifier, the second end of the third resistor is connected with the first end of the fifth resistor, the first end of the second resistor is connected with the sampling end of the driving circuit, the second end of the second resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is grounded, the second end of the second resistor is connected with the positive input end of the first amplifier, the output end of the first amplifier is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the input end of the voltage comparison circuit.
4. The circuit of claim 1, wherein the external voltage control circuit includes a signal input circuit and a second inverter circuit; wherein,
the input end of the signal input circuit is connected with the external signal input end, the output end of the signal input circuit is connected with the input end of the second phase inverter circuit, and the output end of the second phase inverter circuit is connected with the signal input end of the overvoltage protection circuit.
5. The circuit of claim 4, wherein the signal input circuit comprises a sixth resistor, a seventh resistor, and an eighth resistor; wherein,
the first end of the sixth resistor is connected with the external signal input end, the first end of the seventh resistor is connected with the external signal input end, the second end of the sixth resistor is connected with the first end of the eighth resistor, the second end of the seventh resistor is connected with the first input end of the second phase inverter circuit, and the second end of the eighth resistor is connected with the second input end of the second phase inverter circuit.
6. The circuit of claim 5, wherein the second inverter circuit comprises a second NOR gate; wherein,
and a first input end and a second input end of the second NOR gate are respectively connected with a first output end and a second output end of the signal input circuit, and an output end of the second NOR gate is connected with a signal input end of the overvoltage protection circuit.
7. A voltage control protection method applied to the voltage control protection circuit according to any one of claims 1 to 6, wherein the voltage control protection circuit comprises: the control circuit comprises a control chip, a voltage protection circuit and a driving circuit; the voltage control protection method comprises the following steps:
when the control chip receives a smoking starting signal, a driving signal is output to the driving circuit according to the smoking starting signal, so that the driving circuit controls the heating wire to heat;
the voltage protection circuit samples the voltage value of the driving circuit, compares the voltage value with a preset voltage value, and outputs a voltage protection signal to the control chip according to a comparison result;
the voltage protection circuit comprises an overvoltage protection circuit and an external voltage control circuit; the input end of the overvoltage protection circuit is connected with the sampling end of the driving circuit, the output end of the overvoltage protection circuit is connected with the signal input end of the control chip, the input end of the external voltage control circuit is connected with the external signal input end, and the output end of the external voltage control circuit is connected with the signal input end of the overvoltage protection circuit;
the overvoltage protection circuit comprises a conditioning circuit, a voltage comparison circuit, a conditioning voltage division circuit and a first inverter circuit; the input end of the conditioning circuit is connected with the sampling end of the driving circuit, the output end of the conditioning circuit is connected with the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the conditioning voltage division circuit, the output end of the conditioning voltage division circuit is connected with the input end of the first phase inverter circuit, and the output end of the first phase inverter circuit is connected with the signal input end of the control chip;
and the control chip outputs a PWM duty ratio signal to the driving circuit according to the voltage protection signal so as to prevent the over-temperature of the heating wire.
8. An electronic cigarette, characterized in that the electronic cigarette comprises the voltage control protection circuit according to any one of claims 1 to 6, or the voltage control protection method according to claim 7 is applied.
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