Electronic cigarette resistance detection circuit
By designing an electronic cigarette resistance detection circuit, the resistance of the heating wire is directly detected using a processor and a switching transistor network. This solves the problem of difficulty in measuring the resistance of the heating wire after electronic cigarette assembly and enables a convenient detection process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SKE TECH CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-12
AI Technical Summary
In the existing technology, after the electronic cigarette is assembled, it is difficult to conveniently measure the resistance of the heating wire.
An electronic cigarette resistance detection circuit was designed, including a processor, a detection pin, a switching transistor, and a resistor network. By connecting the detection pin to the port to be tested, the processor controls the switching transistor to directly detect the resistance of the heating wire.
The resistance of the heating wire can be measured conveniently and quickly without removing the cartridge, improving testing efficiency.
Smart Images
Figure CN224344327U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of atomization technology, and in particular to an electronic cigarette resistance detection circuit. Background Technology
[0002] The electronic cigarette includes a casing, inside which are a bracket, a battery, a circuit board, and a charging port. The charging port is located at the bottom of the bracket and connects to the circuit board. The circuit board connects to the battery, and the battery can be charged through the charging port. The battery and circuit board are mounted on the bracket, which is installed in the casing. The upper part of the casing is open, and the upper surface of the bracket and the upper part of the casing form a receiving space to facilitate the assembly of the e-cigarette cartridge. The upper surface of the bracket is also provided with two spring pins, which are connected to the circuit board respectively.
[0003] The e-cigarette cartridge includes a transparent shell, a mouthpiece at the top, and a base at the bottom. The base has an air intake, which houses an atomizing tube connected to the mouthpiece. The atomizing tube contains an atomizing coil and an e-liquid inlet. The base, atomizing tube, and transparent shell together form an e-liquid reservoir. The atomizing coil consists of a heating wire and wicking cotton. The heating wire is in close contact with the inner side of the wicking cotton, while the outer side of the wicking cotton is in close contact with the inner wall of the atomizing tube. E-liquid flows into the wicking cotton through the inlet and is heated to a gaseous state by the heating wire. The base also has electrode posts connected to the two ends of the heating wire via leads. The e-cigarette cartridge is assembled into the receiving space, with the electrode posts and leads engaging. A circuit board controls the output of current / voltage to the heating wire.
[0004] The resistance of the heating wire is usually fixed, such as 1 ohm. Before assembling the heating wire into the cartridge, its resistance can be measured. Once the heating wire is inside the cartridge, its resistance can be measured using a multimeter connected to the electrode posts. However, it is very inconvenient to measure the resistance of the heating wire after the cartridge is installed in the housing, as it is impossible to remove the cartridge to measure the resistance of the heating wire.
[0005] Therefore, it is necessary to design a resistance detection circuit to overcome the aforementioned defects. Utility Model Content
[0006] The main objective of this application is to provide an electronic cigarette resistance detection circuit that can continue to detect the resistance value of the heating wire after the electronic cigarette is assembled.
[0007] To achieve the above objectives, this application proposes an electronic cigarette resistance detection circuit, which includes:
[0008] A processor, comprising a first detection pin, a second detection pin, and a first level output pin;
[0009] A first node is connected to a first detection pin via a first resistor R15, and the first node is connected to the battery via a third switch Q3.
[0010] A second node is connected to a second detection pin via a second resistor R16. The second node and the first node are connected via a third resistor R12. The second node is connected to the battery via a second switch Q2. The second switch Q2 is connected to a first level output pin, which outputs a high / low level to control the on / off state of the second switch Q2.
[0011] One port to be tested has one end connected to the first node and the other end grounded.
[0012] The first resistor R15 is grounded through the fourth resistor R27, and the first detection pin is connected to the lead between the first resistor R15 and the fourth resistor R27.
[0013] The second resistor R16 is grounded through the fifth resistor R28, and the second detection pin is connected to the lead between the second resistor R16 and the fourth resistor R27.
[0014] The third switch Q3 has a third gate, a third source, and a third drain. The third drain is connected to the first node and is connected to the battery through a high-resistance resistor R13. The third gate is connected to the battery through a sixth resistor R22, and the third source is connected to the battery.
[0015] It also includes a fourth switch Q6, which has a fourth gate, a fourth source, and a fourth drain. The fourth drain is connected to the third gate, the fourth source is grounded, and the fourth gate is connected to the second level output pin of the processor. The fourth gate and the fourth source are connected through a seventh resistor R30.
[0016] The second switch Q2 has a second gate, a second source, and a second drain. The second node is connected to the second drain, the second source is connected to the battery, and the second gate and the second drain are connected by an eighth resistor R17.
[0017] It also includes a first switching transistor Q1, which has a first gate, a first source, and a first drain. The first drain is connected to the second gate, the first source is grounded, and the first gate and the first source are connected through a ninth resistor R24. The first gate is connected to a first level output pin.
[0018] The battery is connected to the input terminal of the voltage regulator chip, and the output terminal of the voltage regulator chip is connected to the power supply pin of the processor through the tenth resistor R32. The power supply pin of the processor is also grounded through the capacitor C11.
[0019] The battery is also connected to the processor's battery voltage detection pin via the eleventh resistor R5, and the battery voltage detection pin is grounded via the twelfth resistor R11.
[0020] The port to be tested is used to assemble the atomizing component.
[0021] The second node of this application is connected to the second detection pin via a second resistor R16. The second node and the first node are connected via a third resistor R12. The second node is connected to the battery via a second switch Q2. The second switch Q2 is connected to a first level output pin, which outputs a high / low level to control the on / off state of the second switch Q2. A port to be tested has one end connected to the first node and the other end grounded. After assembling the atomizing component into the e-cigarette, the two ends of the heating wire of the atomizing component are precisely aligned with the port to be tested. The processor controls the second switch Q2 to turn on via the first level output pin. The battery supplies power to the first resistor R15 and the second resistor R16 via the second switch Q2. The first and second detection pins respectively detect the voltage division of the first resistor R15 and the second resistor R16, thus obtaining the voltage across the third resistor R12. This allows for the detection of the resistance between the ports to be tested. The measurement is convenient; the heating wire resistance can be detected directly through the processor without removing the e-cigarette cartridge, making it very convenient and fast. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the processor in an embodiment of this design;
[0024] Figure 2 This is a circuit diagram of the detection circuit in an embodiment of this design;
[0025] Figure 3 This is a schematic diagram of the voltage regulator chip circuit in an embodiment of this design;
[0026] Figure 4 This is a schematic diagram of the voltage regulator chip circuit in an embodiment of this design;
[0027] Figure 5 This is a circuit diagram of the battery voltage divider in an embodiment of this design.
[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0031] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0032] the following Figure 1-5 An electronic cigarette resistance detection circuit is disclosed for detecting the atomization component of the electronic cigarette. The atomization component includes a heating wire and wicking cotton, and is disposed in a cartridge. The electronic cigarette includes a cartridge and a device, with the cartridge assembled to form the electronic cigarette. A control component is disposed within the device, including a main control chip, also known as a processor, which is disposed on a circuit board.
[0033] The electronic cigarette resistance detection circuit is described below: a processor, including a first detection pin, a second detection pin, a first level output pin, and a second level output pin; the first detection pin is TCR_L, processor pin number 15; the second detection pin is TCR_H, processor pin number 14; the first level output pin is POW_TCR_EN, processor pin number 28; and the second level output pin is POW_HEAR_EN, processor pin number 26. The processor model is PY32F031K18U6.
[0034] A first node 100 is connected to a first detection pin via a first resistor R15. The first node 100 is connected to a battery via a third switch Q3. The battery is labeled B+.
[0035] A second node 200 is connected to a second detection pin via a second resistor R16. The second node 200 and the first node 100 are connected via a third resistor R12. The second node 200 is connected to a battery via a second switch Q2, which is labeled B+. The second switch Q2 is connected to a first level output pin, which outputs a high / low level to control the on / off state of the second switch Q2.
[0036] One port to be tested has one end connected to the first node 100 and the other end grounded. For example, one end of the port to be tested is H+1 and the other end is H-1. After assembling the atomizing component into the e-cigarette, the two ends of the heating wire of the atomizing component are exactly connected to the port to be tested. When the third switch Q3 is turned on, the battery can output power to the port to be tested through the third switch Q3, and the heating wire can work normally. When the third switch Q3 is turned off, the processor controls the second switch Q2 to turn on through the first level output pin. The battery supplies power to the first resistor R15 and the second resistor R16 through the second switch Q2. The first detection pin and the second detection pin respectively detect the voltage division of the first resistor R15 and the second resistor R16, and then the voltage across the third resistor R12 can be obtained. Thus, the resistance between the ports to be tested can be detected. The measurement is convenient. There is no need to remove the e-cigarette cartridge. The resistance of the heating wire can be detected directly through the processor. It is very convenient and fast.
[0037] The first resistor R15 is grounded through the fourth resistor R27, and the first detection pin is connected to the lead between the first resistor R15 and the fourth resistor R27. The first resistor R15 and the fourth resistor R27 are connected in series and grounded. When the second switch Q2 is turned on, the battery, the second switch Q2, the third resistor R12, the first resistor R15, and the fourth resistor R27 form a circuit. The first detection pin, TCR_L, detects the voltage of the fourth resistor R27. Since the values of the first resistor R15 and the fourth resistor R27 are known, the voltage V1 of the first node 100 can be calculated.
[0038] The second resistor R16 is grounded through the fifth resistor R28. The second detection pin is connected to the lead between the second resistor R16 and the fourth resistor R28. With the second resistor R16 and the fifth resistor R28 grounded, when the second switch Q2 is turned on, the battery, the second switch Q2, the second resistor R16, and the fifth resistor R28 form a circuit. The second detection pin, TCR_H, detects the voltage across the fifth resistor R28. Since the values of the second resistor R16 and the fifth resistor R28 are known, the voltage V2 at the second node 200 can be calculated. This can be obtained using the voltage V1 at the first node 100, the voltage V2 at the second node 200, and the resistance RF of the heating wire. Because the heating wire, the third resistor R12, the second switch Q2, and the battery form a circuit, the resistance RF of the heating wire can be calculated using the identity of equal circuit current.
[0039] The third switch Q3 has a third gate, a third source, and a third drain. The third drain is connected to the first node 100 and is connected to the battery through a high-resistance resistor R13. The third gate is connected to the battery through a sixth resistor R22, and the third source is connected to the battery. The system also includes a fourth switch Q6, which has a fourth gate, a fourth source, and a fourth drain. The fourth drain is connected to the third gate, the fourth source is grounded, and the fourth gate is connected to the processor's second-level output pin. The fourth gate and the fourth source are connected through a seventh resistor R30. The presence of the high-resistance resistor R13 effectively prevents the battery from supplying power to the port under test when the third switch Q3 is off. When the second-level output pin POW_HEAR_EN outputs a high level, the fourth gate becomes high, the fourth switch Q6 is turned on, the fourth source and fourth drain are connected, the fourth source and fourth drain are pulled low, the third gate is also pulled low, the third source and third drain are connected, the third switch Q3 is turned on, and the battery outputs voltage to the first node 100 through the third source and third drain, achieving normal atomization of the heating wire. When atomization is not needed, the second-level output pin POW_HEAR_EN outputs a low level, the fourth switch Q6 is turned off, the fourth source and fourth drain are disconnected, the third gate is pulled high in the circuit of the sixth resistor R22, the third source and third drain are disconnected, the third switch Q3 is turned off, and the battery stops outputting voltage to the first node 100.
[0040] The second switch Q2 has a second gate, a second source, and a second drain. The second node 200 is connected to the second drain, and the second source is connected to the battery. The second gate and the second drain are connected by an eighth resistor R17. The system also includes a first switch Q1, which has a first gate, a first source, and a first drain. The first drain is connected to the second gate, and the first source is grounded. The first gate and the first source are connected by a ninth resistor R24. The first gate is connected to a first-level output pin. When the resistance of the heating wire needs to be detected, the first-level output pin outputs a high level (POW_TCR_EN), the first gate is at a high level, the first source and the first drain are connected, the first switch Q1 is turned on, the second gate is pulled low, the second source and the second drain are connected, and the second switch Q2 is turned on. At this time, the battery, the second switch Q2, and the third resistor R12 form a circuit. The resistance of the heating wire can then be detected. In another state, when the first level output pin outputs a low level of POW_TCR_EN, the first switch Q1 is turned off, the second gate is pulled high by the eighth resistor R17, and the second switch Q2 is turned off. At this time, the resistance of the heating wire is not detected.
[0041] To ensure the processor operates normally, the battery is connected to the input of a voltage regulator chip. The output of the voltage regulator chip is connected to the processor's power supply pin (D3VDD, pin number 1) via a tenth resistor R32. This power supply pin is also grounded via capacitor C11 to ensure timely discharge of excess charge. The voltage regulator chip is model LP3990-30B3F.
[0042] The battery is also connected to the processor's battery voltage detection pin via the eleventh resistor R5. The battery voltage detection pin is BAT_ADC, the processor's pin number 6. The battery voltage detection pin is also grounded via the twelfth resistor R11. The series connection of the eleventh resistor R5 and the twelfth resistor R11 facilitates the detection of the battery voltage by the battery voltage detection pin.
[0043] The port to be tested is used to assemble the atomizing component. After the atomizing component is assembled into the upper receiving space of the e-cigarette rod, the atomizing component and the control component complete the electrical connection. The atomizing component is exactly connected to the port to be tested. The control component can control the output power of the battery to the atomizing component. When the atomizing component is removed, the port to be tested is in an open circuit state.
[0044] The first switch Q1 is an N-MOS transistor, the second switch Q2 is a P-MOS transistor, the third switch Q3 is an N-MOS transistor, and the fourth switch Q6 is an N-MOS transistor. These transistors can be replaced depending on the output level to achieve the control switching function. The first switch Q1 is model 2N7002T, the second switch Q2 is model NR1208MR, the third switch Q3 is model NP1208DR, and the fourth switch Q6 is model 2N7002T.
[0045] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. An electronic cigarette resistance detection circuit, characterized in that, include; A processor, comprising a first detection pin, a second detection pin, and a first level output pin; A first node is connected to a first detection pin via a first resistor R15, and the first node is connected to the battery via a third switch Q3. A second node is connected to a second detection pin via a second resistor R16. The second node and the first node are connected via a third resistor R12. The second node is connected to the battery via a second switch Q2. The second switch Q2 is connected to a first level output pin, which outputs a high / low level to control the on / off state of the second switch Q2. One port to be tested has one end connected to the first node and the other end grounded.
2. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The first resistor R15 is grounded through the fourth resistor R27, and the first detection pin is connected to the lead between the first resistor R15 and the fourth resistor R27.
3. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The second resistor R16 is grounded through the fifth resistor R28, and the second detection pin is connected to the lead between the second resistor R16 and the fourth resistor R27.
4. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The third switch Q3 has a third gate, a third source, and a third drain. The third drain is connected to the first node and is connected to the battery through a high-resistance resistor R13. The third gate is connected to the battery through a sixth resistor R22, and the third source is connected to the battery.
5. The electronic cigarette resistance detection circuit according to claim 4, characterized in that, It also includes a fourth switch Q6, which has a fourth gate, a fourth source, and a fourth drain. The fourth drain is connected to the third gate, the fourth source is grounded, and the fourth gate is connected to the second level output pin of the processor. The fourth gate and the fourth source are connected through a seventh resistor R30.
6. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The second switch Q2 has a second gate, a second source, and a second drain. The second node is connected to the second drain, the second source is connected to the battery, and the second gate and the second drain are connected by an eighth resistor R17.
7. The electronic cigarette resistance detection circuit according to claim 6, characterized in that, It also includes a first switching transistor Q1, which has a first gate, a first source, and a first drain. The first drain is connected to the second gate, the first source is grounded, and the first gate and the first source are connected through a ninth resistor R24. The first gate is connected to a first level output pin.
8. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The battery is connected to the input terminal of the voltage regulator chip, and the output terminal of the voltage regulator chip is connected to the power supply pin of the processor through the tenth resistor R32. The power supply pin of the processor is also grounded through the capacitor C11.
9. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The battery is also connected to the processor's battery voltage detection pin via the eleventh resistor R5, and the battery voltage detection pin is grounded via the twelfth resistor R11.
10. The electronic cigarette resistance detection circuit according to claim 1, characterized in that, The port to be tested is used to assemble the atomizing component.