A charging safety protection circuit for an electronic cigarette

Abstract

This invention provides a charging safety protection circuit for electronic cigarettes, including a power supply and a charging circuit. The output of the power supply is connected to the main control circuit board of the electronic cigarette, and the output of the charging circuit is connected to the power supply for charging. The input of the charging circuit is connected to a 5V constant voltage source and is also electrically connected to the main control circuit board of the electronic cigarette. The charging circuit includes a charging management chip U2, which receives a charging current disconnection control signal from the main control circuit board. The charging circuit can disconnect or connect the charging connection to the power supply according to the control signal from the main control circuit board. The beneficial effect of this invention is that it can automatically disconnect the battery charging current when the user inhales the electronic cigarette while it is charging.

Description

Technical Field

[0001] This utility model relates to the field of protection circuit technology, specifically to a charging safety protection circuit for electronic cigarettes. Background Technology

[0002] Electronic cigarettes are electronic products that mimic traditional cigarettes, possessing the same appearance, smoke, taste, and feel, and even offering a wider variety of flavors than regular cigarettes. They work by atomizing nicotine and other substances into vapor for users to inhale. Generally, electronic cigarettes consist of three main parts: a cartridge containing the nicotine solution, an vaporizer, and a battery. The atomizer, powered by the battery, transforms the liquid nicotine in the cartridge into vapor, giving the user a similar sensation to smoking, allowing them to "exhale clouds of smoke."

[0003] Currently, most e-cigarettes on the market consist of a cartridge and the main body. The cartridge typically comprises a non-removable e-liquid tank and an atomizer. The e-liquid in the tank is atomized by the atomizer for the user to inhale. There are currently two main atomization methods: one is heat atomization, which uses a heating coil and a heating mesh to heat and atomize the e-liquid in the tank for inhalation; the other is ultrasonic atomization, where the e-liquid is ultrasonically atomized by the cartridge. Regardless of the atomization method, the atomizer in the cartridge needs to be powered, and the main body of the e-cigarette must contain a main control circuit board and a power supply.

[0004] In existing technologies, e-cigarettes generally use rechargeable batteries as their power source, requiring recharging every time the battery is depleted. However, since battery charging times are typically quite long, and some users continue to use the e-cigarette while it's charging, the charging current doesn't disconnect during this process. This causes the battery to overheat, potentially leading to bulging or even explosion, resulting in a poor user experience. Utility Model Content

[0005] To address the problems in the prior art, this utility model provides a charging safety protection circuit for electronic cigarettes. By setting up a power supply and a charging circuit that cooperate with each other in the charging safety protection circuit for electronic cigarettes, the charging current of the battery can be automatically disconnected when the user inhales the electronic cigarette while it is charging. This solves the problem in the prior art where the charging current is not disconnected when the electronic cigarette is inhaled during charging, which leads to safety hazards.

[0006] This utility model provides a charging safety protection circuit for electronic cigarettes, including a power supply and a charging circuit. The output terminal of the power supply is connected to the main control circuit board of the electronic cigarette for power supply, and the output terminal of the charging circuit is connected to the power supply for charging. The input terminal of the charging circuit is connected to a 5V constant voltage source and is also electrically connected to the main control circuit board of the electronic cigarette. The charging circuit is equipped with a charging management chip U2, which can receive the charging current disconnection control signal from the main control circuit board of the electronic cigarette. The charging circuit can disconnect or connect the charging connection to the power supply according to the control signal from the main control circuit board of the electronic cigarette.

[0007] This utility model is further improved by including resistors R17 and R2 and capacitor C1 in the charging circuit. The charging management chip U2 has 5 pins. The 4th pin of the charging management chip U2 is connected to a 5V constant voltage source. The 4th pin of the charging management chip U2 is also connected to one end of resistor R2. The other end of resistor R2 is connected to one end of capacitor C1. The 5th pin of the charging management chip U2 is connected to one end of resistor R17. The other end of resistor R17 is electrically connected to the main control circuit board of the electronic cigarette and can receive the charging current disconnection control signal of the main control circuit board of the electronic cigarette. The 3rd pin of the charging management chip U2 is connected to the power supply for charging. The 2nd pin of the charging management chip U2 and the other end of capacitor C1 are grounded.

[0008] In a further improvement to this invention, a capacitor C2 is also provided in the charging circuit. The third pin of the charging management chip U2 is connected to one end of the capacitor C2 and the power supply for charging, and the other end of the capacitor C2 is grounded.

[0009] In a further improvement to this invention, a resistor R5 is provided in the charging circuit. The fifth pin of the charging management chip U2 is connected to one end of the resistor R17 and one end of the resistor R5, and the other end of the resistor R5 is grounded.

[0010] This utility model is further improved, and the charging management chip U2 is model number LP4068.

[0011] In a further improvement to this invention, the power supply is a rechargeable lithium battery.

[0012] Compared with the prior art, the beneficial effects of this utility model are: it provides a charging safety protection circuit for electronic cigarettes. By setting up a power supply and a charging circuit that cooperate with each other in the charging safety protection circuit for electronic cigarettes, the charging circuit can disconnect or connect the charging connection to the power supply according to the control signal of the main control circuit board of the electronic cigarette. It can realize that when the electronic cigarette is charging, the charging current of the battery is automatically disconnected when the user inhales the electronic cigarette, which significantly improves the protection capability of the rechargeable lithium battery of the electronic cigarette, improves the charging safety of the electronic cigarette, and solves the problem in the prior art that the charging current is not disconnected when the electronic cigarette is charged, which leads to safety hazards. Attached Figure Description

[0013] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a circuit diagram of a charging safety protection circuit for electronic cigarettes according to the present invention. Detailed Implementation

[0015] 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 invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, this utility model provides a charging safety protection circuit for electronic cigarettes, including a power supply and a charging circuit. The power supply is a rechargeable lithium battery, and its output is connected to the main control circuit board of the electronic cigarette. The output of the charging circuit is connected to the power supply for charging, and its input is connected to a 5V constant voltage source. The input of the charging circuit is also electrically connected to the main control circuit board of the electronic cigarette. The charging circuit includes a charging management chip U2, which can receive the charging current disconnection control signal from the main control circuit board of the electronic cigarette. The charging circuit also includes resistors R17 and R2, and capacitor C1. The charging management chip U2 is an LP4068, and it has five pins. The fourth pin of the charging management chip U2 is connected to a 5V constant voltage source. Pin 4 of chip 2 is also connected to one end of resistor R2, and the other end of resistor R2 is connected to one end of capacitor C1. Pin 5 of charging management chip U2 is connected to one end of resistor R17, and the other end of resistor R17 is electrically connected to the main control circuit board of the electronic cigarette and can receive the charging current disconnection control signal of the main control circuit board of the electronic cigarette. Pin 3 of charging management chip U2 is connected to the power supply for charging. Pin 2 of charging management chip U2 and the other end of capacitor C1 are grounded. There is also a capacitor C2 in the charging circuit. Pin 3 of charging management chip U2 is connected to one end of capacitor C2 and the power supply for charging. The other end of capacitor C2 is grounded. There is also a resistor R5 in the charging circuit. Pin 5 of charging management chip U2 is connected to one end of resistor R17 and one end of resistor R5. The other end of resistor R5 is grounded. In this embodiment, the charging circuit can disconnect or connect the charging connection to the power supply according to the control signal of the main control circuit board of the electronic cigarette. When the electronic cigarette is charging, the control signal CH_EN of the main control circuit board of the electronic cigarette to the other end of the resistor R17 is set to the input state; when the user is inhaling while the electronic cigarette is charging, the control signal CH_EN of the main control circuit board of the electronic cigarette to the other end of the resistor R17 is set to output 1. At this time, the charging current of the charging management chip U2 to the rechargeable lithium battery is disconnected, which significantly improves the protection capability of the rechargeable lithium battery of the electronic cigarette and enhances the charging safety of the electronic cigarette.

[0019] As can be seen from the above, this utility model provides a charging safety protection circuit for electronic cigarettes. By setting up a power supply and a charging circuit that cooperate with each other in the charging safety protection circuit for electronic cigarettes, the charging circuit can disconnect or connect the charging connection to the power supply according to the control signal of the main control circuit board of the electronic cigarette. This enables the automatic disconnection of the battery charging current when the user inhales the electronic cigarette while it is charging, which significantly improves the protection capability of the rechargeable lithium battery of the electronic cigarette, enhances the charging safety of the electronic cigarette, and solves the problem in the prior art that the charging current will not be disconnected when the electronic cigarette is inhaled, resulting in safety hazards.

[0020] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A charging safety protection circuit for electronic cigarettes, characterized in that: The device includes a power supply and a charging circuit. The output of the power supply is connected to the main control circuit board of the electronic cigarette, and the output of the charging circuit is connected to the power supply for charging. The input of the charging circuit is connected to a 5V constant voltage source and is also electrically connected to the main control circuit board of the electronic cigarette. The charging circuit contains a charging management chip U2, which can receive the charging current disconnection control signal from the main control circuit board of the electronic cigarette. The charging circuit can disconnect or connect the charging connection to the power supply according to the control signal from the main control circuit board of the electronic cigarette.

2. The charging safety protection circuit for electronic cigarettes according to claim 1, characterized in that: The charging circuit also includes resistors R17 and R2 and capacitor C1. The charging management chip U2 has 5 pins. The 4th pin of the charging management chip U2 is connected to a 5V constant voltage source. The 4th pin of the charging management chip U2 is also connected to one end of resistor R2. The other end of resistor R2 is connected to one end of capacitor C1. The 5th pin of the charging management chip U2 is connected to one end of resistor R17. The other end of resistor R17 is electrically connected to the main control circuit board of the electronic cigarette and can receive the charging current disconnection control signal of the main control circuit board of the electronic cigarette. The 3rd pin of the charging management chip U2 is connected to the power supply for charging. The 2nd pin of the charging management chip U2 and the other end of capacitor C1 are grounded.

3. The charging safety protection circuit for electronic cigarettes according to claim 2, characterized in that: The charging circuit also includes a capacitor C2. The third pin of the charging management chip U2 is connected to one end of the capacitor C2 and the power supply for charging, and the other end of the capacitor C2 is grounded.

4. The charging safety protection circuit for electronic cigarettes according to claim 3, characterized in that: The charging circuit also includes a resistor R5. The fifth pin of the charging management chip U2 is connected to one end of the resistor R17 and one end of the resistor R5, and the other end of the resistor R5 is grounded.

5. The charging safety protection circuit for electronic cigarettes according to claim 4, characterized in that: The charging management chip U2 is model LP4068.

6. The charging safety protection circuit for electronic cigarettes according to claim 5, characterized in that: The power supply is a rechargeable lithium battery.

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