CN116210990A - Sensor circuit, miaow head sensor and electron cigarette - Google Patents
Sensor circuit, miaow head sensor and electron cigarette Download PDFInfo
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- CN116210990A CN116210990A CN202310078133.XA CN202310078133A CN116210990A CN 116210990 A CN116210990 A CN 116210990A CN 202310078133 A CN202310078133 A CN 202310078133A CN 116210990 A CN116210990 A CN 116210990A
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- 235000019504 cigarettes Nutrition 0.000 title description 3
- 230000010355 oscillation Effects 0.000 claims abstract description 213
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 239000003571 electronic cigarette Substances 0.000 claims abstract description 31
- 230000009471 action Effects 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000007599 discharging Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 12
- 230000002159 abnormal effect Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 241000208125 Nicotiana Species 0.000 description 7
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000019640 taste Nutrition 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
- A24F40/50—Control or monitoring
- A24F40/51—Arrangement of sensors
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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
- A24F40/10—Devices using liquid inhalable precursors
-
- 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
- A24F40/90—Arrangements or methods specially adapted for charging batteries thereof
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The disclosure provides a sensor circuit, a microphone sensor and an electronic cigarette. The sensor circuit comprises a reference oscillation module, a detection oscillation module, a reference voltage module and a control module, wherein the reference oscillation module comprises a first charge-discharge unit, the detection oscillation module comprises a second charge-discharge unit, the control module is connected with the reference oscillation module and the detection oscillation module, the detection oscillation module is connected with a microphone of the microphone sensor and the reference oscillation module, and the reference voltage module is connected with the first charge-discharge unit and the second charge-discharge unit; under the condition that the microphone detects that a user performs pumping action, the reference voltage module provides reference voltage to respectively control the charge and discharge current of the first charge and discharge unit and the charge and discharge current of the second charge and discharge unit, so that the first oscillation period of the reference oscillation module and the second oscillation period of the detection oscillation module are irrelevant to temperature; the control module outputs a first control signal when the first oscillation period and the second oscillation period satisfy a set condition.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of sensors, in particular to a sensor circuit, a microphone sensor and an electronic cigarette.
Background
The electronic cigarette is an electronic product which simulates a traditional cigarette, and after a user performs a smoking action, the user heats tobacco tar to generate smoke for the user to inhale. At present, the electronic cigarettes have various product appearances and rich tastes, and attract more and more user groups. The specific working principle of the electronic cigarette is as follows: when a user sucks, the output capacitance of the microphone in the electronic cigarette changes, the sensor circuit is connected with the microphone, and the output capacitance of the microphone is converted into a control signal, so that a heating circuit in the electronic cigarette atomizes tobacco tar. However, when the heating circuit works, the temperature of the sensor circuit rises along with the heating circuit, so that the sensor circuit has the risk of abnormal control and damage to the electronic cigarette.
Disclosure of Invention
It is an object of embodiments of the present disclosure to provide a new solution for a sensor circuit.
According to a first aspect of embodiments of the present disclosure, there is provided a sensor circuit comprising a reference oscillation module, a detection oscillation module, a reference voltage module, a control module, the reference oscillation module comprising a first charge-discharge unit, the detection oscillation module comprising a second charge-discharge unit,
the control module is respectively connected with the reference oscillation module and the detection oscillation module, the detection oscillation module is respectively connected with the microphone of the microphone sensor and the reference oscillation module, and the reference voltage module is respectively connected with the first charge and discharge unit and the second charge and discharge unit;
when the microphone detects that a user performs a pumping action, the reference voltage module is used for providing reference voltage to respectively control the charge and discharge current of the first charge and discharge unit and the charge and discharge current of the second charge and discharge unit, so that a first oscillation period of the reference oscillation module and a second oscillation period of the detection oscillation module are irrelevant to temperature;
the control module is used for outputting a first control signal under the condition that the first oscillation period and the second oscillation period meet the set conditions.
Optionally, the reference oscillation module further includes a fixed capacitor and a first comparison unit, and the first charge-discharge unit includes a first controlled current source and a second controlled current source;
the first end of the first controlled current source is connected with the power supply end, the control end of the first controlled current source is connected with the reference voltage module, the second end of the first controlled current source is connected with the first end of the fixed capacitor, the second end of the fixed capacitor is grounded, the first end of the second controlled current source is connected with the first end of the fixed capacitor, the first control end of the second controlled current source is connected with the reference voltage module, the second control end of the second controlled current source is connected with the output end of the first comparison unit, the second end of the second controlled current source is grounded, the second input end of the first comparison unit is connected with the reference voltage module, the second input end of the first comparison unit is connected with the first end of the fixed capacitor, and the output end of the first comparison unit is also connected with the control module.
Optionally, the detection oscillation module further comprises a second comparison unit, the second charge-discharge unit comprises a third controlled current source and a fourth controlled current source,
the first end of the third controlled current source is connected with the power supply end, the control end of the third controlled current source is connected with the reference voltage module, the second end of the third controlled current source is connected with the first end of the output capacitor of the microphone, the second end of the output capacitor is grounded, the first end of the fourth controlled current source is connected with the first end of the output capacitor, the first control end of the fourth controlled current source is connected with the reference voltage module, the second control end of the fourth controlled current source is connected with the output end of the second comparison unit, the second end of the fourth controlled current source is grounded, the first input end of the second comparison unit is connected with the reference voltage module, the second input end of the second comparison unit is connected with the first end of the output capacitor, and the output end of the second comparison unit is also connected with the control module.
Optionally, the first oscillation period is determined according to the fixed capacitance, the control coefficient of the first controlled current source, the control coefficient of the second controlled current source and the delay time of the first comparison unit.
Optionally, the second oscillation period is determined according to the second capacitance, the control coefficient of the third controlled current source, the control coefficient of the fourth controlled current source and the delay time of the second comparing unit.
Optionally, the setting condition includes that a ratio of the first oscillation period and the second oscillation period is greater than a set threshold.
Optionally, the first comparing unit is a first comparator, the non-inverting input end of the first comparator is a first input end of the first comparing unit, the inverting input end of the first comparator is a second input end of the first comparing unit, and the output end of the first comparator is an output end of the first comparing unit.
Optionally, the second comparing unit is a second comparator, the non-inverting input end of the second comparator is a first input end of the second comparing unit, the inverting input end of the second comparator is a second input end of the second comparing unit, and the output end of the second comparator is an output end of the second comparing unit.
According to a second aspect of embodiments of the present disclosure, there is provided a microphone sensor comprising:
a microphone;
the sensor circuit of the first aspect above, the microphone being connected to the sensor circuit.
According to a third aspect of embodiments of the present disclosure, there is provided an electronic cigarette, the electronic cigarette comprising:
an atomizer;
a microphone sensor as in the second aspect above, the microphone sensor being connected to the atomizer.
The electronic cigarette atomizer control circuit has the advantages that when the microphone detects that a user performs pumping action, the reference voltage module can provide reference voltage to control charge and discharge current of a first charge and discharge unit in the reference oscillation module and charge and discharge current of a second charge and discharge unit in the detection oscillation module respectively, so that a first oscillation period of the reference oscillation module and a second oscillation period of the detection oscillation module are irrelevant to temperature, and the control module outputs a first control signal to control the operation of the electronic cigarette atomizer under the condition that the first oscillation period and the second oscillation period meet set conditions. The charging and discharging current is controlled through the reference voltage, so that the oscillation period of the reference oscillation module and the oscillation period of the detection oscillation module are irrelevant to temperature, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.
FIG. 1 is a schematic diagram of a sensor circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural view of a reference oscillation module according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a detection oscillation module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural view of a microphone sensor according to an embodiment of the disclosure;
fig. 5 is a schematic structural view of an electronic cigarette according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the embodiments of the present disclosure unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
< sensor Circuit embodiment >
Referring to fig. 1, which is a schematic circuit diagram of a sensor circuit according to an embodiment of the present application, as shown in fig. 1, a sensor circuit 10 includes a reference oscillating module 110, a detection oscillating module 120, a reference voltage module 130, and a control module 140. The reference oscillation module 110 includes a first charge and discharge unit 111, and the detection oscillation module 120 includes a second charge and discharge unit 121. The control module 140 is respectively connected with the reference oscillation module 110 and the detection oscillation module 120, the detection oscillation module 120 is respectively connected with the microphone 20 of the microphone sensor and the reference oscillation module 110, and the reference voltage module 130 is respectively connected with the first charge and discharge unit 111 and the second charge and discharge unit 112.
The microphone 20 is an airflow sensor in the microphone sensor, and is used for detecting whether the user performs the pumping action. Specifically, when the microphone 20 detects that the user has performed a pumping action, the output capacitance of the microphone 20 is changed.
In this embodiment, when the microphone detects that the user performs the pumping action, the reference voltage module is configured to provide a reference voltage to control the charge and discharge current of the first charge and discharge unit and the charge and discharge current of the second charge and discharge unit, so that a first oscillation period of the reference oscillation module and a second oscillation period of the detection oscillation module are independent of temperature; the control module is used for outputting a first control signal under the condition that the first oscillation period and the second oscillation period meet the set conditions.
Specifically, the detection of the output capacitance of the microphone 20 by the sensor circuit 10 generally uses two oscillation modules, one of which is the reference oscillation module 110 and the other of which is the detection oscillation module 120. The first charge and discharge unit 111 in the reference oscillation module 110 is configured to charge and discharge a fixed capacitor, and further output a reference oscillation signal. The detection oscillation module 120 is configured to charge and discharge an output capacitor of the microphone 20 and output a detection oscillation signal. The control module 140 detects the oscillation period of the detected oscillation signal under the control of the reference oscillation signal, and when the user performs the pumping action to change the output capacitance of the microphone 20, the reference voltage module 130 provides the reference voltage to control the charge and discharge current of the first charge and discharge unit 111, so that the first oscillation period T of the reference oscillation module 110 0 Independent of temperature, and providing a reference voltage to control the charge-discharge current of the second charge-discharge unit 120 so as to detect the second oscillation period T of the oscillation module 120 1 Independent of temperature. And then in the first oscillation period T 0 And a second oscillation period T 1 Under the condition that the set condition is met, a first control signal is output to control a heating circuit in the atomizer to atomize tobacco tar in the atomizer.
It can be appreciated that the first oscillation period T of the reference oscillation module 110 0 A first oscillation period T, which may also be referred to as a reference oscillation signal 0 Detecting a second oscillation period T of the oscillation module 120 1 The second oscillation period T, which may also be referred to as the detection oscillation signal 1 。
In the related art, the oscillation period is generally related to the charge-discharge current and the reference voltage, however, since the charge-discharge current is generated by the corresponding reference module and is independent of the reference voltage, the charge-discharge current is generated by the corresponding reference moduleThe electric current and the reference voltage have no correlation, and the charge-discharge current and the reference voltage have obvious change along with the temperature, so that the oscillation period is changed along with the temperature, and the abnormal control phenomenon caused by the temperature exists. Since the present embodiment uses the reference voltage to control the charge-discharge current of the first charge-discharge cell, the reference voltage has a correlation with the charge-discharge current of the first charge-discharge cell, so that the first oscillation period T 0 Independent of the charge-discharge current and the reference voltage, only related to the design value, thereby enabling the first oscillation period T 0 Independent of temperature. And controlling the charge-discharge current of the second charge-discharge cell using a reference voltage having a correlation with the charge-discharge current of the second charge-discharge cell such that the second oscillation period T 1 Independent of the charge-discharge current and the reference voltage, only related to the design value, thereby enabling the first oscillation period T 1 Independent of temperature, i.e. the first oscillation period T 0 And a second oscillation period T 1 The sensor circuit is not changed along with the temperature, so that the abnormal starting of the sensor circuit caused by the temperature change is effectively avoided, and the damage to the product is further avoided.
According to the embodiment of the application, when the microphone detects that the user performs the pumping action, the reference voltage module provides the reference voltage to respectively control the charge and discharge current of the first charge and discharge unit in the reference oscillation module and the charge and discharge current of the second charge and discharge unit in the detection oscillation module, so that the first oscillation period of the reference oscillation module and the second oscillation period of the detection oscillation module are irrelevant to the temperature, and the control module outputs the first control signal to control the atomizer in the electronic cigarette to work under the condition that the first oscillation period and the second oscillation period meet the set conditions. The charging and discharging current is controlled through the reference voltage, so that the oscillation period of the reference oscillation module and the oscillation period of the detection oscillation module are irrelevant to temperature, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
In one embodiment, referring to fig. 2, the reference oscillation module 110 further includes a fixed capacitor 112 and a first comparison unit 113, and the first charge and discharge unit 111 includes a first controlled current source 1111 and a second controlled current source 1112.
The first controlled current source 1111 has a first end connected to the power supply end 30, the first controlled current source 1111 has a control end connected to the reference voltage module 130 (reference voltage module 130 is not shown in fig. 2), the first controlled current source 1111 has a second end connected to the first end of the fixed capacitor 112, the second end of the fixed capacitor 112 is grounded, the second controlled current source 1112 has a first end connected to the first end of the fixed capacitor 112, the second controlled current source 1112 has a first control end connected to the reference voltage module 130, the second controlled current source 1112 has a second control end connected to the output end of the first comparison unit 113, the second controlled current source 1112 has a second end connected to the second end of the second comparison unit 1112, the first input end of the first comparison unit 113 is connected to the reference voltage module 130, the second input end of the first comparison unit 113 is connected to the first end of the fixed capacitor 112, and the output end of the first comparison unit 113 is also connected to the control module 130 (control module 130 is not shown in fig. 2).
Wherein the first controlled current source 1111 is a charging current source, and the charging current of the first controlled current source 1111 is a reference voltage V outputted by the reference voltage module 130 T Control is performed such that the charging current of the first controlled current source 1111 is g 1 *V T . Wherein g 1 As the control coefficient of the first controlled current source 1111, it is determined at the time of designing the first controlled current source 1111, that is, the control coefficient g of the first controlled current source 1111 1 Is a fixed value. It can be appreciated that since the charging current of the first controlled current source 1111 is g 1 *V T That is, the charging current of the first controlled current source 1111 and the reference voltage V T Linear correlation.
Wherein the second controlled current source 1112 is a discharge current source, and the discharge current of the second controlled current source 1112 is the reference voltage V outputted by the reference voltage module 130 T Control is performed such that the output current of the second controlled current source 1112 is g 2 *V T . Wherein g 2 For the control coefficient of the second controlled current source 1112Which is determined when designing the second controlled current source 1112, i.e. the control coefficient g of the second controlled current source 1112 2 Is a fixed value. It can be appreciated that since the discharge current of the second controlled current source 1112 is g 2 *V T That is, the discharge current of the second controlled current source 1112 and the reference voltage V T Linear correlation.
Referring to fig. 2, the first comparator 113 is a first comparator, a non-inverting input terminal of the first comparator is a first input terminal of the first comparator 113, an inverting input terminal of the first comparator is a second input terminal of the first comparator 113, and an output terminal of the first comparator is an output terminal of the first comparator 113. The first comparator has the following characteristics, when the reference voltage V of the non-inverting input terminal of the first comparator T The first comparator outputs a logic high level when the voltage is larger than the voltage of the inverting input terminal of the first comparator, and the reference voltage V of the non-inverting input terminal of the first comparator T The first comparator outputs a logic low level when the voltage is smaller than the voltage of the inverting input terminal.
The working principle of the reference oscillation module 110 will be described with reference to fig. 2: the first controlled current source 1111 pair of fixed capacitors C 0 Charging is performed when the first comparing unit 113 detects that the charging voltage is greater than the reference voltage V T In the case of outputting a logic low level, controlling the second controlled current source 1112 to the fixed capacitance C 0 Discharging is performed when the first comparing unit 113 detects that the discharge voltage is smaller than the reference voltage V T (it will be appreciated that, due to the rapid rate of discharge, a logic high level is output with a direct discharge to zero potential in general) to disconnect the second controlled power source 1112 so that the first controlled current source 1111 re-pairs the fixed capacitance C 0 Charging is performed. The charging time T of the reference oscillation module 110 c0 The following formula (1) is satisfied:
g 1 *V T *T c0 ＝C 0 *V T (1)
wherein g 1 Is the control coefficient of the first controlled power supply 1111, V T Reference voltage, C, provided to reference voltage module 130 0 For a fixed capacitance 112, g 1 *V T Representing the charging current of the first controlled current source 1111.
And, a discharge time T of the reference oscillation module 110 D0 The following formula (2) is satisfied:
g 2 *V T *T D0 ＝C 0 *V T (2)
wherein g 2 Is the control coefficient of the second controlled power source 1112, V T Reference voltage, C, provided to reference voltage module 130 0 For a fixed capacitance 112, g 2 *V T Representing the discharge current of the second controlled current source 1112.
Here, the first oscillation period T of the reference oscillation module 110 0 Satisfies the following formula (3):
T 0 ＝T c0 +T D0 +T delay1 (3)
wherein T is c0 For the charging time of the reference oscillation module 110, T D0 For the discharge time of the reference oscillation module 110, T delay1 As the delay time length of the first comparing unit 113, which has been determined at the time of designing the first comparing unit 113, i.e., the delay time length T of the first comparing unit 113 delay 1 is a fixed value.
As can be seen from the above equation (1), the charging time of the reference oscillation module 110
As can be seen from the above formula (2), the discharge time of the reference oscillation module 110 +.>
The charging time of the reference oscillation module 110 is +.>
And the discharge time of the reference oscillation module 110 +.>
Substituting into the above formula (3) to obtain the first reference oscillation module 110An oscillation period->
That is, the first oscillation period T 0 According to a fixed capacitance C 0 Control coefficient g of the first controlled current source 1111 1 Control coefficient g of the second controlled current source 1112 2 And a delay time length T of the first comparing unit 113 delay1 It was determined that it did not change with temperature and was not affected by temperature.
In one embodiment, referring to fig. 3, the detection oscillation module 120 further includes a second comparing unit 122, and the second charging and discharging unit 121 includes a third controlled current source 1211 and a fourth controlled current source 1212.
The first end of the third controlled current source 1211 is connected to the power supply end 30, the control end of the third controlled current source 1212 is connected to the reference voltage module 130 (reference voltage module 130 is not shown in fig. 3), the second end of the third controlled current source 1212 is connected to the first end of the output capacitor 21 of the microphone 20, the second end of the output capacitor 21 is grounded, the first end of the fourth controlled current source 1212 is connected to the first end of the output capacitor 21, the first control end of the fourth controlled current source 1212 is connected to the reference voltage module 130, the second control end of the fourth controlled current source 1212 is connected to the output end of the second comparing unit 122, the second end of the fourth controlled current source 1212 is grounded, the first input end of the second comparing unit 122 is connected to the reference voltage module 130, the second input end of the second comparing unit 122 is connected to the first end of the output capacitor 21, and the output end of the second comparing unit 122 is further connected to the control module 140 (control module 130 is not shown in fig. 3).
Wherein the third controlled current source 1211 is a charging current source, and the charging current of the third controlled current source 1211 is the reference voltage V outputted by the reference voltage module 130 T Control is performed such that the charging current of the third controlled current source 1211 is g 3 *V T . Wherein g 3 Is the control coefficient of the third controlled current source 1211, which is set for the third controlled current source 1211The timing has been determined, i.e. the control factor g of the third controlled current source 1211 3 Is a fixed value. It can be appreciated that since the charging current of the third controlled current source 1211 is g 3 *V T That is, the charging current of the third controlled current source 1211 and the reference voltage V T Linear correlation.
Wherein the fourth controlled current source 1212 is a discharge current source, and the discharge current of the fourth controlled current source 1212 is the reference voltage V outputted by the reference voltage module 130 T Control is performed such that the output current of the fourth controlled current source 1212 is g 4 *V T . Wherein g 4 As the control coefficient of the fourth controlled current source 1212, it is determined already at the time of designing the fourth controlled current source 1212, i.e. the control coefficient g of the fourth controlled current source 1212 4 Is a fixed value. It can be appreciated that since the discharge current of the fourth controlled current source 1212 is g 4 *V T That is, the discharge current of the fourth controlled current source 1212 and the reference voltage V T Linear correlation.
Referring to fig. 3, the second comparing unit 122 is a second comparator, a non-inverting input terminal of the second comparator is a first input terminal of the second comparing unit 122, an inverting input terminal of the second comparator is a second input terminal of the second comparing unit 122, and an output terminal of the second comparator is an output terminal of the second comparing unit 122. The second comparator has the following characteristics when the reference voltage V at the non-inverting input terminal of the second comparator T The second comparator outputs a logic high level when the voltage is greater than the voltage at the inverting input terminal of the second comparator, and the reference voltage V at the non-inverting input terminal of the second comparator T The second comparator outputs a logic low level when the voltage is smaller than the voltage of the inverting input terminal.
Next, the working principle of the detection oscillation module 120 will be described with reference to fig. 3: third controlled current source 1211 pair output capacitance C sw Charging is performed when the second comparing unit 122 detects that the charging voltage is greater than the reference voltage V T In the case of (a) outputting a logic low level, controlling the fourth controlled current source 1212 to a fixed output capacitance C sw Discharging is performed when the second comparing unit 122 detectsThe discharge voltage is measured to be less than the reference voltage V T (it will be appreciated that, due to the rapid rate of discharge, a logic high level is output with a direct discharge to zero potential in general) to disconnect the fourth controlled power source 1212, causing the third controlled current source 1211 to re-pair the output capacitance C sw Charging is performed. Then the charging time T of the oscillation module 120 is detected c1 The following formula (4) is satisfied:
g 3 *V T *T c1 ＝C sw *V T (4)
wherein g 3 Is the control factor, V, of the third controlled power source 1211 T Reference voltage, C, provided to reference voltage module 130 sw For output capacitance 21, g 3 *V T Representing the charging current of the third controlled current source 1211.
And detecting the discharge time T of the oscillation module 120 D1 The following formula (5) is satisfied:
g 4 *V T *T D1 ＝C sw *V T (5)
wherein g 4 For the control factor of the fourth controlled power source 1212, V T Reference voltage, C, provided to reference voltage module 130 sw For output capacitance 21, g 4 *V T Representing the discharge current of the fourth controlled current source 1212.
Here, the second oscillation period T of the oscillation module 120 is detected 1 The following formula (6) is satisfied:
T 1 ＝T c1 +T D1 +T delay2 (6)
wherein T is c1 To detect the charging time of the oscillation module 120, T D1 To detect the discharge time of the oscillation module 120, T delay2 As the delay time of the second comparison unit 122, which is already determined when the second comparison unit 122 is designed, i.e. the delay time T of the second comparison unit 122 delay2 Is a fixed value.
As can be seen from the above equation (4), the charging time of the oscillation module 120 is detected
As can be seen from the above equation (5), the discharge time of the oscillation module 120 is detected +.>
The charging time of the oscillation module 120 will be detected
And detecting the discharge time of the oscillation module 120 +.>
Substituting into the above formula (6), the second oscillation period +.>
That is, the second oscillation period T 1 According to a fixed capacitance C sw Control coefficient g of third controlled current source 1211 3 Control coefficient g of fourth controlled current source 1212 4 And a delay time period T of the second comparing unit 122 delay2 It was determined that it did not change with temperature and was not affected by temperature.
In one embodiment, the setting condition includes the first oscillation period T 0 And the second oscillation period T 1 Ratio of (2)
Greater than a set threshold k.
The set threshold k may be designed according to the actual scene, which is not limited in this embodiment. This can be understood as a first oscillation period T 0 And the second oscillation period T 1 Ratio of (2)
If the first control signal is greater than the set threshold k, the control module 140 outputs the first control signal to control the heating circuit in the atomizer to heat and atomize the tobacco tar in the atomizer.
In the present embodiment, the control module 140 controls the operation of the control device byFirst oscillation period T of reference oscillation module 110 0 And detecting a second oscillation period T of the oscillation module 120 1 When the ratio exceeds a set threshold k, that is, when the output capacitance of the microphone changes by the suction action of the user to exceed the trigger threshold, the control module 140 outputs a first control signal to enable the heating circuit in the atomizer to heat and atomize the tobacco tar in the atomizer, wherein the suction trigger process is represented by the following formula (7):
as can be seen from the above formula (7), the present embodiment uses the reference voltage to control the charge and discharge current so that
The temperature is irrelevant, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
< microphone sensor embodiment >
Fig. 4 is a schematic circuit configuration diagram of the microphone sensor according to an embodiment. As shown in fig. 4, the microphone sensor 40 includes a microphone 41 and a sensor circuit 41, and the microphone 41 is connected to the sensor circuit 41, and the sensor circuit 41 may be the sensor circuit 10 provided in the above-described embodiment.
When the microphone 41 detects that the user has performed a pumping operation to change the output capacitance of the microphone 41, the sensor circuit 42 outputs a first control signal based on the output capacitance. The detailed structure of the sensor circuit 42 can be referred to the above embodiments, and will not be described herein; it can be understood that, since the above-mentioned sensor circuit is used in the microphone sensor of the embodiment of the present application, the embodiments of the microphone sensor of the embodiment of the present application include all the technical solutions of all the embodiments of the above-mentioned sensor circuit, and the achieved technical effects are also completely the same. That is, when the microphone detects that the user performs the pumping action, the reference voltage module provides the reference voltage to control the charge and discharge current of the first charge and discharge unit in the reference oscillation module and the charge and discharge current of the second charge and discharge unit in the detection oscillation module, so that the first oscillation period of the reference oscillation module and the second oscillation period of the detection oscillation module are irrelevant to the temperature, and the control module outputs the first control signal to control the atomizer in the electronic cigarette to work when the first oscillation period and the second oscillation period meet the set conditions. The charging and discharging current is controlled through the reference voltage, so that the oscillation period of the reference oscillation module and the oscillation period of the detection oscillation module are irrelevant to temperature, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
< device example >
Fig. 5 is a schematic structural diagram of an electronic cigarette according to one embodiment. As shown in fig. 5, the electronic cigarette includes a microphone sensor 51, which may be the microphone sensor 40 described in the above embodiment, and an atomizer 52. The microphone sensor 51 is connected to the atomizer 52. It will be appreciated that the electronic cigarette further includes a power source, and the terminal of the power source is the power source terminal 30 shown in fig. 2 or fig. 3.
In specific implementation, the working principle of the electronic cigarette is as follows: under the condition that the output capacitance of the microphone changes due to the fact that the user is detected to perform suction action by the microphone of the microphone sensor, the sensor circuit of the microphone sensor outputs a first control signal according to the output capacitance, so that a heating circuit in the atomizer heats and atomizes tobacco tar in the atomizer. The detailed structure of the microphone sensor can refer to the above embodiments, and will not be described herein again; it can be understood that, because the microphone sensor is used in the electronic cigarette of the embodiment of the application, the embodiment of the electronic cigarette of the embodiment of the application includes all the technical schemes of all the embodiments of the microphone sensor, and the achieved technical effects are completely the same. That is, when the microphone detects that the user performs the pumping action, the reference voltage module provides the reference voltage to control the charge and discharge current of the first charge and discharge unit in the reference oscillation module and the charge and discharge current of the second charge and discharge unit in the detection oscillation module, so that the first oscillation period of the reference oscillation module and the second oscillation period of the detection oscillation module are irrelevant to the temperature, and the control module outputs the first control signal to control the atomizer in the electronic cigarette to work when the first oscillation period and the second oscillation period meet the set conditions. The charging and discharging current is controlled through the reference voltage, so that the oscillation period of the reference oscillation module and the oscillation period of the detection oscillation module are irrelevant to temperature, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
The following shows the operation of the electronic cigarette of an example:
in step S101, the microphone detects that the user performs the pumping action, so that the output capacitance of the microphone changes.
Step S102, the reference oscillation module 110 pairs the fixed capacitor C 0 Charging and discharging are performed, and then a reference oscillation signal is output, and the control module 140 detects a first oscillation period of the reference oscillation signal.
In this step S102, the first controlled current source 1111 has a fixed capacitance C 0 Charging is performed when the first comparing unit 113 detects that the charging voltage is greater than the reference voltage V T In the case of outputting a logic low level, controlling the second controlled current source 1112 to the fixed capacitance C 0 Discharging is performed when the first comparing unit 113 detects that the discharge voltage is smaller than the reference voltage V T To turn off the second controlled power supply 1112 so that the first controlled current source 1111 again clamps the capacitance C 0 Charging is performed, and then a reference oscillation signal is output. Based on this, the control module 140 detects a first oscillation period of the reference oscillation signal
Step S103, detecting the output capacitance C of the oscillating module 120 sw Charging and discharging are performed, and then a detection oscillation signal is output, and the control module 140 detects an oscillation period of the detection oscillation signal under control of the reference oscillation signal.
In this step S103, a third pair of controlled current sources 1211Output capacitor C sw Charging is performed when the second comparing unit 122 detects that the charging voltage is greater than the reference voltage V T In the case of (a) outputting a logic low level, controlling the fourth controlled current source 1212 to a fixed output capacitance C sw Discharging is performed when the second comparing unit 122 detects that the discharging voltage is smaller than the reference voltage V T To turn off the fourth controlled power source 1212 so that the second controlled current source 1211 re-pairs the output capacitance C sw Charging is performed, and then a detection oscillation signal is obtained. Based on this, the control module 140 detects a second oscillation period of the detected oscillation signal
Step S104, the control module 140 performs a first oscillation period T 0 And a second oscillation period T 1 And outputting a first control signal when the ratio between the two is larger than a set threshold k.
In step S105, the heating circuit in the atomizer controls the tobacco tar in the atomizer to heat and atomize through the first control signal.
According to the present example, the charging and discharging currents are controlled using the reference voltage such that the reference voltage is linearly related to the charging current and the discharging current, respectively, such that the oscillation period T of the reference oscillation module 0 And detecting the oscillation period T of the oscillation module 1 Independent of charge current, discharge current and reference voltage, i.e. oscillation period T of reference oscillation module 0 And detecting the oscillation period T of the oscillation module 1 Is not affected by temperature, thereby ensuring the oscillation period T of the reference oscillation module 0 And detecting the oscillation period T of the oscillation module 1 Ratio of (C) to (B)
The temperature is irrelevant, and the damage to the electronic cigarette caused by abnormal starting of the sensor circuit due to temperature change is effectively avoided.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A sensor circuit is characterized by comprising a reference oscillation module, a detection oscillation module, a reference voltage module and a control module, wherein the reference oscillation module comprises a first charge-discharge unit, the detection oscillation module comprises a second charge-discharge unit,
the control module is respectively connected with the reference oscillation module and the detection oscillation module, the detection oscillation module is respectively connected with the microphone of the microphone sensor and the reference oscillation module, and the reference voltage module is respectively connected with the first charge and discharge unit and the second charge and discharge unit;
when the microphone detects that a user performs a pumping action, the reference voltage module is used for providing reference voltage to respectively control the charge and discharge current of the first charge and discharge unit and the charge and discharge current of the second charge and discharge unit, so that a first oscillation period of the reference oscillation module and a second oscillation period of the detection oscillation module are irrelevant to temperature;
the control module is used for outputting a first control signal under the condition that the first oscillation period and the second oscillation period meet the set conditions.
2. The sensor circuit of claim 1, wherein the reference oscillation module further comprises a fixed capacitance and a first comparison unit, the first charge-discharge unit comprising a first controlled current source and a second controlled current source;
the first end of the first controlled current source is connected with the power supply end, the control end of the first controlled current source is connected with the reference voltage module, the second end of the first controlled current source is connected with the first end of the fixed capacitor, the second end of the fixed capacitor is grounded, the first end of the second controlled current source is connected with the first end of the fixed capacitor, the first control end of the second controlled current source is connected with the reference voltage module, the second control end of the second controlled current source is connected with the output end of the first comparison unit, the second end of the second controlled current source is grounded, the first input end of the first comparison unit is connected with the reference voltage module, the second input end of the first comparison unit is connected with the first end of the fixed capacitor, and the output end of the first comparison unit is also connected with the control module.
3. The sensor circuit of claim 1, wherein the detection oscillation module further comprises a second comparison unit, the second charge-discharge unit comprising a third controlled current source and a fourth controlled current source,
the first end of the third controlled current source is connected with the power supply end, the control end of the third controlled current source is connected with the reference voltage module, the second end of the third controlled current source is connected with the first end of the output capacitor of the microphone, the second end of the output capacitor is grounded, the first end of the fourth controlled current source is connected with the first end of the output capacitor, the first control end of the fourth controlled current source is connected with the reference voltage module, the second control end of the fourth controlled current source is connected with the output end of the second comparison unit, the second end of the fourth controlled current source is grounded, the first input end of the second comparison unit is connected with the reference voltage module, the second input end of the second comparison unit is connected with the first end of the output capacitor, and the output end of the second comparison unit is also connected with the control module.
4. The sensor circuit of claim 2, wherein the first oscillation period is determined based on the fixed capacitance, a control coefficient of the first controlled current source, a control coefficient of the second controlled current source, and a delay time of the first comparison unit.
5. A sensor circuit according to claim 3, wherein the second oscillation period is determined from the output capacitance, the control coefficient of the third controlled current source, the control coefficient of the fourth controlled current source and the delay time of the second comparing unit.
6. The sensor circuit of claim 1, wherein the set condition includes a ratio of the first oscillation period and the second oscillation period being greater than a set threshold.
7. The sensor circuit of claim 2, wherein the first comparator is a first comparator, a non-inverting input of the first comparator is a first input of the first comparator, an inverting input of the first comparator is a second input of the first comparator, and an output of the first comparator is an output of the first comparator.
8. A sensor circuit according to claim 3, wherein the second comparator is a second comparator, the non-inverting input of the second comparator is a first input of the second comparator, the inverting input of the second comparator is a second input of the second comparator, and the output of the second comparator is an output of the second comparator.
9. A microphone sensor, the microphone sensor comprising:
a microphone;
a sensor circuit according to any one of claims 1 to 8, the microphone being connected to the sensor circuit.
10. An electronic cigarette, the electronic cigarette comprising:
an atomizer;
a microphone sensor as claimed in claim 9, which is connected to the atomiser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310078133.XA CN116210990A (en) | 2023-01-16 | 2023-01-16 | Sensor circuit, miaow head sensor and electron cigarette |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310078133.XA CN116210990A (en) | 2023-01-16 | 2023-01-16 | Sensor circuit, miaow head sensor and electron cigarette |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116584714A (en) * | 2023-07-18 | 2023-08-15 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116584714A (en) * | 2023-07-18 | 2023-08-15 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
| CN116584714B (en) * | 2023-07-18 | 2023-10-20 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
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Effective date of registration: 20231108 Address after: 261000 No. 2, Zhengtai Road, Fangzi District, Weifang City, Shandong Province Applicant after: WEIFANG ZHENGDA INDUSTRY CO.,LTD. Address before: 266101 f / F, phase II, Qingdao International Innovation Park, 1 Keyuan Weiyi Road, Laoshan District, Qingdao City, Shandong Province Applicant before: Geer Microelectronics Co.,Ltd. |