Electronic cigarette capacitive touch switch circuit and electronic atomizer
Patent Information
- Application Number
- CN202522122387.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-30
AI Technical Summary
上述的操作方式需要用户精准判断并定位开关位置，导致在光线较暗的环境或者用户注意力不集中的情况下，难以找到并准确操作开关
[0019]上述的电子烟电容式触摸开关电路，采用电容式触摸感应方式，用户仅通过手部接触烟杆外壳的触摸键即可触发开机，无需定位机械按压键进行按压操作，从而提升用户使用的便捷性。并且相比传统机械开关，电容式触摸结构无物理触点磨损，减少了因机械损耗导致的故障风险，延长了开关的使用寿命，同时提升电子烟电容式触摸开关电路的可靠性。
Smart Images
Figure CN224804935U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the technical field of electronic cigarette switch control, and in particular to an electronic cigarette capacitive touch switch circuit and an electronic atomizer. Background Technology
[0002] In the e-cigarette industry, traditional power-on / off operation primarily relies on manual mechanical switches. Users need to precisely locate the switch and perform actions such as pressing or flicking to turn the e-cigarette on or off. This method requires users to accurately judge and locate the switch, making it difficult to find and operate accurately in low-light environments or when users are not focused.
[0003] For example, when a user gets up at night to use an e-cigarette, they may have to fumble for the power switch in the dark; in scenarios where concentration is required, such as when a user is driving and wants to use an e-cigarette, visually confirming the location of the control switch will distract the user, increase safety risks, and reduce the ease of operation.
[0004] In addition, after repeated use, the manual mechanical switch button is prone to wear and loosening, resulting in poor contact, affecting the normal power-on and power-off function of the electronic cigarette, and reducing the reliability and service life of the product. Utility Model Content
[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an electronic cigarette capacitive touch switch circuit and electronic atomizer that improves the convenience and reliability of electronic cigarette power-on and power-off operation by replacing traditional buttons with a touch module.
[0006] The purpose of this disclosure is achieved through the following technical solution:
[0007] A capacitive touch switch circuit for an electronic cigarette includes a main control chip, a touch sensing module, and an e-liquid heating module. The touch sensing module includes a touch chip and a first current-limiting resistor. The first end of the first current-limiting resistor is connected to the touch button of the electronic cigarette device, and the second end of the first current-limiting resistor is connected to the sensing signal input terminal of the touch chip.
[0008] The touch switch signal terminal of the main control chip is connected to the sensing signal output terminal of the touch sensing module, the heating signal output terminal of the main control chip is connected to the heating control terminal of the e-liquid heating module, the input terminal of the e-liquid heating module is used to connect to the battery power supply terminal, and the output terminal of the e-liquid heating module is used to connect to the positive electrode of the e-liquid heating element.
[0009] In one embodiment, the touch sensing module further includes a first filter capacitor, the first end of which is connected to the sensing signal input terminal of the touch chip, and the second end of which is grounded.
[0010] In one embodiment, the touch sensing module further includes a second filter capacitor, the first end of which is connected to the power input terminal of the touch chip, and the second end of which is grounded. The power input terminal of the touch chip is used to connect to a battery power supply terminal.
[0011] In one embodiment, the e-liquid heating module includes a heating control switch and a bias resistor. The first end of the heating control switch is used to connect to the battery power supply terminal, the second end of the heating control switch is used to connect to the positive electrode of the e-liquid heating element, and the control terminal of the heating control switch is connected to the heating signal output terminal of the main control chip.
[0012] In one embodiment, the heating control switch is a P-channel MOS transistor.
[0013] In one embodiment, the e-liquid heating module further includes a sampling resistor, the first end of which is connected to the voltage detection terminal of the main control chip, and the second end of which is used to connect to the negative terminal of the e-liquid heating element.
[0014] In one embodiment, the e-liquid heating module further includes a second current-limiting resistor, the first end of which is connected to the second end of the sampling resistor, and the second end of which is grounded.
[0015] In one embodiment, the touch chip is model SC70202.
[0016] In one embodiment, the electronic cigarette capacitive touch switch circuit further includes a charging module, which includes a charging control chip and a third filter capacitor. The input terminal of the charging control chip is used to connect to an external charging interface, and the output terminal of the charging control chip is connected to the battery power supply terminal. The first terminal of the third filter capacitor is connected to the battery power supply terminal, and the second terminal of the third filter capacitor is grounded.
[0017] This application also provides an electronic atomizer, including the electronic cigarette capacitive touch switch circuit described in any of the above embodiments.
[0018] Compared with the prior art, this disclosure has at least the following advantages:
[0019] The aforementioned capacitive touch switch circuit for electronic cigarettes employs a capacitive touch sensing method. Users can activate the device simply by touching the touch button on the cigarette holder's outer shell, eliminating the need for a mechanical button and thus improving user convenience. Furthermore, compared to traditional mechanical switches, the capacitive touch structure eliminates physical contact wear, reducing the risk of malfunctions due to mechanical wear, extending the switch's lifespan, and enhancing the reliability of the electronic cigarette's capacitive touch switch circuit. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 A circuit diagram of a capacitive touch switch circuit for an electronic cigarette according to one embodiment;
[0022] Figure 2 for Figure 1 The diagram shows a partial circuit diagram of the capacitive touch switch circuit for an electronic cigarette. Detailed Implementation
[0023] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0026] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:
[0027] like Figure 1 and Figure 2 As shown, an embodiment of the electronic cigarette capacitive touch switch circuit 10 disclosed herein includes a main control chip U1, a touch sensing module 200, and an e-liquid heating module 300. The touch sensing module 200 includes a touch chip U3 and a first current-limiting resistor R7. The first end of the first current-limiting resistor R7 is used to connect to the touch button of the electronic cigarette device, and the second end of the first current-limiting resistor R7 is connected to the sensing signal input terminal TK of the touch chip U3.
[0028] The touch switch signal terminal KEY1 of the main control chip U1 is connected to the sensing signal output terminal QC of the touch sensing module 200. The heating signal output terminal Switch of the main control chip U1 is connected to the heating control terminal of the e-liquid heating module 300. The input terminal of the e-liquid heating module 300 is used to connect to the battery power supply terminal VBAT. The output terminal of the e-liquid heating module 300 is used to connect to the positive terminal of the e-liquid heating element.
[0029] In this embodiment, when a user's hand touches the touch button on the outer shell of the electronic cigarette, a coupling capacitor is formed between the human body and the touch button, causing a change in the equivalent capacitance value of the touch button. This change in equivalent capacitance alters the RC charging and discharging characteristics of the sensing end, and is fed back to the sensing signal input terminal TK of the touch chip U3 through the first current-limiting resistor R7. After the touch chip U3 detects the capacitance change at the sensing signal input terminal TK in real time, it converts it into a switch signal and transmits it from the sensing signal output terminal QC to the touch switch signal terminal KEY1 of the main control chip U1. Further, after receiving a valid signal from the touch chip U3, the main control chip U1 recognizes it as a power-on command and then sends a heating control signal to the heating control terminal of the e-liquid heating module 300 through the heating signal output terminal Switch. When the voltage at the heating control terminal of the e-liquid heating module 300 reaches the conduction threshold, the heating module starts working, obtains electrical energy from the battery power supply terminal VBAT, and transmits the electrical energy through the heating module to the e-liquid heating element, causing the heating element to heat the e-liquid, allowing the user to perform vaping.
[0030] When the user's hand leaves the e-cigarette's casing, the capacitive coupling between the touch button and the user's body disappears. The capacitance of the sensor signal input terminal TK of the touch chip U3 returns to its initial state, and the touch chip U3 cannot detect any capacitance change. Therefore, the sensor signal output terminal QC stops outputting valid signals to the main control chip U1. If the main control chip U1 does not receive a valid touch signal within a preset time, it determines that a heating stop command has been issued and immediately stops sending heating control signals to the e-liquid heating module 300 through the heating signal output terminal Switch. After the e-liquid heating module 300 stops working, the e-cigarette enters standby mode.
[0031] The aforementioned capacitive touch switch circuit 10 for electronic cigarettes employs a capacitive touch sensing method. Users can power on the device simply by touching the touch button on the cigarette holder's outer shell, eliminating the need for a mechanical button and thus improving user convenience. Furthermore, compared to traditional mechanical switches, the capacitive touch structure eliminates physical contact wear, reducing the risk of malfunctions due to mechanical wear, extending the switch's lifespan, and enhancing the reliability of the electronic cigarette capacitive touch switch circuit 10.
[0032] like Figure 1 and Figure 2 As shown, in one embodiment, the touch sensing module 200 further includes a first filter capacitor C5. The first end of the first filter capacitor C5 is connected to the sensing signal input terminal TK of the touch chip U3, and the second end of the first filter capacitor C5 is grounded. In this embodiment, when a human body contacts the touch key on the outer shell of the electronic cigarette, the equivalent capacitance value of the touch key undergoes a slight change. However, due to the presence of interference signals, the original capacitance change signal may be masked by noise, making it difficult for the touch chip U3 to accurately detect the actual capacitance change, leading to misjudgment or failure to trigger the corresponding operation. At this time, the first filter capacitor C5 has the characteristics of "passing AC and blocking DC" and "passing high frequencies and blocking low frequencies," effectively filtering out the aforementioned high-frequency interference signals. The first filter capacitor C5 is connected to the sensing signal input terminal TK of the touch chip U3. For high-frequency interference signals, the first filter capacitor C5 exhibits a low impedance, allowing the high-frequency interference signal to be grounded through the capacitor, thereby bypassing to the ground terminal and preventing the high-frequency interference signal from entering the touch chip U3. For low-frequency capacitance change signals caused by human touch, the first filter capacitor C5 exhibits a high impedance, which ensures that the signal is transmitted smoothly to the touch chip U3, thereby improving the accuracy and reliability of the touch chip U3 in detecting capacitance changes.
[0033] like Figure 1 and Figure 2As shown, in one embodiment, the touch sensing module 200 further includes a second filter capacitor C3. The first end of the second filter capacitor C3 is connected to the power input terminal of the touch chip U3, and the second end of the second filter capacitor C3 is grounded. The power input terminal of the touch chip U3 is used to connect to the battery power supply terminal VBAT. In this embodiment, the second filter capacitor C3, through its energy storage characteristics, can effectively suppress high-frequency noise and instantaneous voltage fluctuations in the power supply: when the VBAT voltage rises due to interference, the second filter capacitor C3 absorbs excess energy for charging, reducing the voltage peak; when the VBAT voltage drops briefly, the second filter capacitor C3 releases the stored energy to replenish the current gap and maintain voltage stability. For high-frequency noise signals, the second filter capacitor C3 exhibits low impedance characteristics, allowing it to be directly bypassed to the ground terminal, thereby preventing noise from entering the touch chip U3 and improving the operating stability of the touch chip U3.
[0034] like Figure 1 and Figure 2 As shown, in one embodiment, the e-liquid heating module 300 includes a heating control switch Q1 and a bias resistor R4. The first terminal of the heating control switch Q1 is connected to the battery power supply terminal VBAT, and the second terminal is connected to the positive electrode of the e-liquid heating element. The control terminal of the heating control switch Q1 is connected to the heating signal output terminal Switch of the main control chip U1. In this embodiment, when the main control chip U1 sends a conduction signal to the control terminal of the heating control switch Q1 through the heating signal output terminal Switch, it drives the heating control switch Q1 to conduct, thus forming a path between the battery power supply terminal VBAT and the positive electrode of the e-liquid heating element. Current can then flow smoothly through the e-liquid heating element, causing it to heat the e-liquid, allowing the user to perform vaping. Conversely, when the main control chip U1 sends a cutoff signal, it controls the heating control switch Q1 to switch to the cutoff state, thereby cutting off the current path and stopping the e-liquid heating element. This ensures the timeliness and accuracy of e-liquid heating, enabling rapid start or stop of heating according to the user's needs. Furthermore, the bias resistor R4 stabilizes the potential at the control terminal of Q1, providing it with a suitable bias voltage and ensuring stable switching between the on and off states. When there are slight fluctuations in the heating signal output by the main control chip U1, the bias resistor R4 prevents the switching transistor Q1 from being mistakenly turned on or off due to unstable control terminal voltage. This avoids situations where the e-liquid heating element heats for an extended period or fails to heat at all due to circuit abnormalities, effectively protecting the safety of the circuit and the e-liquid heating element, preventing overheating damage or insufficient heating that could negatively impact the user experience.
[0035] like Figure 1 and Figure 2As shown, in one embodiment, the heating control switch Q1 is a P-channel MOSFET. In this embodiment, the first terminal of the heating control switch Q1 is the source of the P-channel MOSFET, the second terminal of the heating control switch Q1 is the drain of the P-channel MOSFET, and the control terminal of the heating control switch Q1 is the gate of the P-channel MOSFET. Since the source of the heating control switch Q1 is directly connected to the battery power supply terminal VBAT, when the heating signal output terminal Switch of the main control chip U1 outputs a low-level signal, the gate potential is significantly lower than the source potential. The gate-source voltage difference reaches the conduction threshold of the P-channel MOSFET, at which point a low-impedance conductive channel is formed inside the MOSFET, and conduction occurs between the source and drain. The current output from the battery power supply terminal VBAT is transferred to the e-liquid heating element through the source and drain of the P-channel MOSFET. The heating element generates heat after receiving a stable current, thus heating the e-liquid. Conversely, when the heating signal output terminal Switch of the main control chip U1 outputs a high-level signal, the gate potential approaches the source potential, and the gate-source voltage difference approaches 0V, failing to reach the conduction threshold. The heating control switch Q1 is in a high-impedance cutoff state, interrupting the heating circuit current and stopping the heating element. These switching characteristics allow the main control chip U1 to precisely control the start and stop of e-liquid heating by controlling the gate voltage, ensuring the accuracy of the heating process.
[0036] like Figure 1 and Figure 2As shown, in one embodiment, the e-liquid heating module 300 further includes a sampling resistor R5. The first end of the sampling resistor R5 is connected to the voltage detection terminal of the main control chip U1, and the second end of the sampling resistor R5 is connected to the negative terminal of the e-liquid heating element. In this embodiment, when the e-liquid heating element is working, current flows from the battery power supply terminal VBAT through the heating control switch Q1 to the positive terminal of the heating element, and then forms a loop through the negative terminal of the heating element. At this time, when the current flows through the sampling resistor R5, because the resistance value of the sampling resistor R5 is fixed, a voltage drop proportional to the loop current will be generated across its two ends. This voltage signal is directly transmitted to the voltage detection terminal of the main control chip U1. Since the resistance value of the sampling resistor R5 is fixed, the voltage drop across its two ends strictly follows Ohm's law with the loop current. The main control chip U1 can indirectly calculate the magnitude of the heating current by detecting this voltage signal, thereby monitoring the working status of the heating element in real time. Specifically, when an abnormally large current occurs in the circuit due to a short circuit or abnormal load, the current flowing through the sampling resistor R5 increases, the voltage drop across the sampling resistor R5 increases significantly, and the detection signal transmitted to the main control chip U1 also exceeds the preset upper limit. If the resistance of the heating element increases abnormally due to poor contact or aging, the circuit current decreases, the voltage drop across the sampling resistor R5 decreases, and the detection signal will be lower than the preset lower limit. When the detection signal exceeds the preset upper limit threshold or falls below the preset lower limit threshold, the main control chip U1 can quickly determine that it is in an abnormal state and immediately output a cutoff control signal to the control terminal of the heating control switch Q1 through the heating signal output terminal Switch to cut off the heating circuit and stop the heating process. This avoids damage to the battery, switch, or heating element due to excessive current, and also prevents heating failure of the heating element due to insufficient current or open circuit.
[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the e-liquid heating module 300 further includes a second current-limiting resistor R6. The first end of the second current-limiting resistor R6 is connected to the second end of the sampling resistor R5, and the second end of the second current-limiting resistor R6 is grounded. In this embodiment, the second current-limiting resistor R6 and the sampling resistor R5 together form a voltage divider and current-limiting network. When the e-liquid heating element is working, the loop current flows through the sampling resistor R5 and the second current-limiting resistor R6. The voltage change across the heating element is divided by the two resistors, generating a voltage value related to the heating element voltage on the second current-limiting resistor R6. By detecting the voltage on the second current-limiting resistor R6, the main control chip U1 can more accurately obtain the operating voltage information of the e-liquid heating element. Accurate voltage detection helps the main control chip U1 more accurately determine the operating state of the heating element, thereby improving the reliability of the circuit system.
[0038] like Figure 1 and Figure 2As shown, in one embodiment, the touch chip U3 is model SC70202. In this embodiment, the SC70202 touch chip has a high-sensitivity capacitance detection capability, and its internally integrated precision capacitance detection circuit can accurately identify extremely small capacitance changes. When the user's hand touches the touch button on the e-cigarette device shell, the SC70202 can quickly and accurately capture the minute changes in the coupling capacitance formed between the human body and the touch button, making the e-cigarette respond extremely promptly to the user's touch operation, thereby improving the user's operating experience when using the e-cigarette and avoiding operation delays or misjudgments caused by insensitive detection.
[0039] like Figure 1 and Figure 2 As shown, in one embodiment, the electronic cigarette capacitive touch switch circuit 10 further includes a charging module 400. The charging module 400 includes a charging control chip U2 and a third filter capacitor C2. The input terminal of the charging control chip U2 is connected to an external charging interface, and the output terminal of the charging control chip U2 is connected to the battery power supply terminal VBAT. The first terminal of the third filter capacitor C2 is connected to the battery power supply terminal VBAT, and the second terminal of the third filter capacitor C2 is grounded. In this embodiment, during the charging process, the charging control chip U2 can accurately control the charging process and automatically adjust the charging current and voltage according to the current state of the battery to ensure that the battery is charged with the most suitable parameters, which can improve charging efficiency and avoid battery damage caused by overcharging and overcurrent. At the same time, the external power supply may introduce various high-frequency noises and voltage fluctuations. The third filter capacitor C2 can bypass high-frequency noise to the ground terminal, effectively filtering out these high-frequency interference signals and preventing them from entering the battery power supply circuit. Furthermore, the third filter capacitor C2 smooths out voltage fluctuations generated during charging by utilizing its energy storage characteristics. When the voltage rises, it absorbs excess energy, and when the voltage drops, it releases the stored energy, thereby maintaining the stability of the VBAT voltage at the battery power supply terminal. This provides a stable charging voltage for the battery and a stable power supply for circuit components such as the touch sensing module and the e-liquid heating module.
[0040] This application also provides an electronic atomizer, including the electronic cigarette capacitive touch switch circuit 10 of any of the above embodiments. In this embodiment, when the user's hand touches the touch key on the outer shell of the electronic cigarette, a coupling capacitor is formed between the human body and the touch key, causing a change in the equivalent capacitance value of the touch key. This change is transmitted to the sensing signal input terminal TK of the touch chip U3 through the first current-limiting resistor R7; after the touch chip U3 detects the capacitance change of the sensing signal input terminal TK in real time, it converts it into a switch signal and transmits it from the sensing signal output terminal QC to the touch switch signal terminal KEY1 of the main control chip U1. Further, after receiving the signal from the touch chip U3, the main control chip U1 recognizes it as a power-on command, and then sends a heating control signal to the heating control terminal of the e-liquid heating module 300 through the heating signal output terminal Switch. When the voltage of the heating control terminal of the e-liquid heating module 300 reaches the conduction threshold, the heating module starts working, obtains electrical energy from the battery power supply terminal VBAT, and the electrical energy is transmitted to the e-liquid heating element through the heating module, causing the heating element to heat up to heat the e-liquid, and the user can then perform a vaping operation. When the user's hand leaves the e-cigarette's casing, the capacitive coupling between the touch button and the user's body disappears. The capacitance of the sensor signal input terminal TK of the touch chip U3 returns to its initial state, and the touch chip U3 cannot detect any capacitance change. Therefore, the sensor signal output terminal QC stops outputting valid signals to the main control chip U1. If the main control chip U1 does not receive a valid touch signal within a preset time, it determines it as a power-off command and stops sending heating control signals to the e-liquid heating module 300 through the heating signal output terminal Switch. The e-liquid heating module 300 then stops working, putting the e-cigarette into standby mode.
[0041] Compared with the prior art, this disclosure has at least the following advantages:
[0042] The aforementioned capacitive touch switch circuit 10 for electronic cigarettes employs a capacitive touch sensing method. Users can power on the device simply by touching the touch button on the cigarette holder's outer shell, eliminating the need for a mechanical button and thus improving user convenience. Furthermore, compared to traditional mechanical switches, the capacitive touch structure eliminates physical contact wear, reducing the risk of malfunctions due to mechanical wear, extending the switch's lifespan, and enhancing the reliability of the electronic cigarette capacitive touch switch circuit 10.
[0043] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A capacitive touch switch circuit for electronic cigarettes, characterized in that, Includes the main control chip, touch sensing module, and e-liquid heating module. The touch sensing module includes a touch chip and a first current-limiting resistor. The first end of the first current-limiting resistor is used to connect to the touch button of the electronic cigarette device, and the second end of the first current-limiting resistor is connected to the sensing signal input terminal of the touch chip. The touch switch signal terminal of the main control chip is connected to the sensing signal output terminal of the touch sensing module, the heating signal output terminal of the main control chip is connected to the heating control terminal of the e-liquid heating module, the input terminal of the e-liquid heating module is used to connect to the battery power supply terminal, and the output terminal of the e-liquid heating module is used to connect to the positive electrode of the e-liquid heating element.
2. The electronic cigarette capacitive touch switch circuit according to claim 1, characterized in that, The touch sensing module further includes a first filter capacitor, the first end of which is connected to the sensing signal input terminal of the touch chip, and the second end of which is grounded.
3. The electronic cigarette capacitive touch switch circuit according to claim 2, characterized in that, The touch sensing module also includes a second filter capacitor. The first end of the second filter capacitor is connected to the power input terminal of the touch chip, and the second end of the second filter capacitor is grounded. The power input terminal of the touch chip is used to connect to the battery power supply terminal.
4. The electronic cigarette capacitive touch switch circuit according to claim 1, characterized in that, The e-liquid heating module includes a heating control switch and a bias resistor. The first end of the heating control switch is used to connect to the battery power supply terminal, and the second end of the heating control switch is used to connect to the positive terminal of the e-liquid heating element. The control terminal of the heating control switch is connected to the heating signal output terminal of the main control chip.
5. The electronic cigarette capacitive touch switch circuit according to claim 4, characterized in that, The heating control switch is a P-channel MOSFET.
6. The electronic cigarette capacitive touch switch circuit according to claim 1, characterized in that, The e-liquid heating module also includes a sampling resistor. The first end of the sampling resistor is connected to the voltage detection terminal of the main control chip, and the second end of the sampling resistor is used to connect to the negative terminal of the e-liquid heating element.
7. The electronic cigarette capacitive touch switch circuit according to claim 6, characterized in that, The e-liquid heating module further includes a second current-limiting resistor, the first end of which is connected to the second end of the sampling resistor, and the second end of which is grounded.
8. The electronic cigarette capacitive touch switch circuit according to claim 1, characterized in that, The touch chip is model SC70202.
9. The electronic cigarette capacitive touch switch circuit according to claim 1, characterized in that, The electronic cigarette capacitive touch switch circuit also includes a charging module, which includes a charging control chip and a third filter capacitor. The input terminal of the charging control chip is used to connect to an external charging interface, and the output terminal of the charging control chip is connected to the battery power supply terminal. The first terminal of the third filter capacitor is connected to the battery power supply terminal, and the second terminal of the third filter capacitor is grounded.
10. An electronic atomizer, characterized in that, Includes the electronic cigarette capacitive touch switch circuit as described in any one of claims 1 to 9.