Electronic cigarette charging case voltage divider circuit and electronic cigarette charging device

Abstract

This disclosure provides a voltage divider circuit for an electronic cigarette charging case and an electronic cigarette charging device. The voltage divider circuit includes a voltage divider control module, a cigarette charging module, a first voltage divider resistor, and an interrupt reset module. One end of the voltage divider control module is connected to the output terminal of the cigarette charging module, and the other end is grounded. Its control terminal is connected to the voltage divider control signal terminal of a microcontroller. The microcontroller's voltage divider control signal terminal is connected to the first terminal of the interrupt reset module via the first voltage divider resistor, and this terminal is also connected to the microcontroller's interrupt signal terminal. The control terminal of the interrupt reset module is connected to the output terminal of the cigarette charging module and the first terminal of the voltage divider control module, and its second terminal is grounded. After the cigarette charging is completed, the microcontroller controls the voltage divider control module to turn on, reducing the output voltage of the cigarette charging module. This causes the internal chip to stop unnecessary operations due to insufficient operating voltage, avoiding continuous power consumption caused by repeated data overwriting of the internal chip during standby, thus extending the electronic cigarette's usage time and battery life.

Description

Technical Field

[0001] This disclosure relates to the technical field of electronic cigarette charging, and in particular to a voltage divider circuit for an electronic cigarette charging case and an electronic cigarette charging device. Background Technology

[0002] In the e-cigarette product system, the coordinated power supply of the charging case and the e-cigarette device is the core link to ensure the device's battery life. Among them, the main control chip of the e-cigarette device, as the core control unit, undertakes the key functions of regulating the working status of the e-cigarette device, storing user data, and adapting the charging process.

[0003] In existing technologies, the charging box provides charging voltage to the e-cigarette device through its output terminal. When the e-cigarette device's battery is fully charged, the charging circuit enters standby mode. However, due to inherent circuit design limitations, a certain voltage amplitude remains between the charging box's output terminal and the e-cigarette device's charging terminal. This residual voltage continuously acts on the power supply pins or data interface pins of the e-cigarette device's main control chip. Since most e-cigarette device main control chips have low data read / write trigger thresholds to achieve low power consumption, when the residual voltage reaches or approaches the chip's minimum trigger voltage for data overwriting, the chip may mistakenly interpret it as a data update command, thus initiating the data overwriting process.

[0004] However, the aforementioned accidental overwriting behavior will not only cause the critical data stored inside the e-cigarette to become disordered, but will also cause the battery level of the e-cigarette to continuously decrease, thereby affecting the user experience and product reliability. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a voltage divider circuit for an electronic cigarette charging box and an electronic cigarette charging device that prevents the chip of the electronic cigarette from being accidentally activated by reducing the standby voltage of the electronic cigarette device.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A voltage divider circuit for an electronic cigarette charging case includes a voltage divider control module, a cigarette charging module, a first voltage divider resistor, and an interrupt reset module. The first terminal of the voltage divider control module is connected to the output terminal of the cigarette charging module, the input terminal of the cigarette charging module is used to connect to an external power supply, the second terminal of the voltage divider control module is grounded, and the control terminal of the voltage divider control module is used to connect to the voltage divider control signal terminal of a microcontroller.

[0008] The voltage divider control signal terminal of the microcontroller is connected to the first terminal of the interrupt reset module through the first voltage divider resistor. The first terminal of the interrupt reset module is also used to connect to the interrupt signal terminal of the microcontroller. The control terminal of the interrupt reset module is connected to the output terminal of the cigarette charging module and the first terminal of the voltage divider control module, respectively. The second terminal of the interrupt reset module is grounded.

[0009] In one embodiment, the voltage divider control module includes a first electronic switch and a second voltage divider resistor. The first terminal of the first electronic switch is connected to the output terminal of the cigarette charging module, the control terminal of the first electronic switch is connected to the voltage divider control signal terminal of the microcontroller through the second voltage divider resistor, and the second terminal of the first electronic switch is grounded.

[0010] In one embodiment, the voltage divider control module further includes a third voltage divider resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is grounded.

[0011] In one embodiment, the first electronic switch is an N-channel MOS transistor.

[0012] In one embodiment, the cigarette charging module includes a cigarette charging component and a fourth voltage divider resistor. The input terminal of the cigarette charging component is used to connect to an external power source, and the output terminal of the cigarette charging component is grounded through the fourth voltage divider resistor.

[0013] In one embodiment, the interrupt reset module includes a second electronic switch and a fifth voltage divider resistor. The first end of the second electronic switch is connected to the interrupt signal terminal of the microcontroller and one end of the first voltage divider resistor, respectively. The control terminal of the second electronic switch is connected to the output terminal of the cigarette charging module through the fifth voltage divider resistor, and the second end of the second electronic switch is grounded.

[0014] In one embodiment, the interrupt reset module further includes a current-limiting resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is grounded.

[0015] In one embodiment, the second electronic switch is an NPN transistor.

[0016] In one embodiment, the current-limiting resistor is an adjustable resistor.

[0017] This application also provides an electronic cigarette charging device, including the voltage divider circuit of the electronic cigarette charging box described in any of the above embodiments.

[0018] Compared with the prior art, this disclosure has at least the following advantages:

[0019] The voltage divider circuit of the e-cigarette charging box described above, after the e-cigarette is fully charged, controls the voltage divider control module to turn on through the microcontroller, which reduces the output voltage of the e-cigarette charging module. This causes the internal chip of the e-cigarette charging module to stop unnecessary operations due to insufficient operating voltage, thereby effectively avoiding the problem of continuous power consumption caused by repeated data overwriting in the standby state of the e-cigarette, and extending the usage time of the e-cigarette and battery life. 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 This is a circuit diagram of a voltage divider circuit for an electronic cigarette charging case according to one embodiment. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0026] like Figure 1As shown, an embodiment of the electronic cigarette charging box voltage divider circuit 10 of this disclosure includes a voltage divider control module 100, a cigarette charging module 200, a first voltage divider resistor R6, and an interrupt reset module 300. The first terminal of the voltage divider control module 100 is connected to the output terminal of the cigarette charging module 200, the input terminal of the cigarette charging module 200 is used to connect to an external power supply, the second terminal of the voltage divider control module 100 is grounded, and the control terminal of the voltage divider control module 100 is used to connect to the voltage divider control signal terminal DEV of the microcontroller.

[0027] The voltage divider control signal terminal DEV of the microcontroller is connected to the first terminal of the interrupt reset module 300 through the first voltage divider resistor R6. The first terminal of the interrupt reset module 300 is also used to connect to the interrupt signal terminal SIRQ of the microcontroller. The control terminal of the interrupt reset module 300 is connected to the output terminal of the cigarette rod charging module 200 and the first terminal of the voltage divider control module 100, respectively. The second terminal of the interrupt reset module 300 is grounded.

[0028] In this embodiment, when an external power source is connected to the input terminal of the cigarette charging module 200, and the cigarette battery is not fully charged, the microcontroller determines that continuous charging is required. At this time, the microcontroller's voltage divider control signal terminal DEV outputs a low-level signal to the control terminal of the voltage divider control module 100, and the microcontroller's interrupt signal terminal SIRQ outputs a high-level signal. Since the control terminal of the voltage divider control module 100 is connected to the microcontroller's voltage divider control signal terminal DEV, the low-level signal output by the microcontroller's voltage divider control signal terminal DEV prevents the control terminal of the voltage divider control module 100 from reaching the conduction threshold voltage. Therefore, the voltage divider control module 100 is in a cutoff state and cannot form a grounding loop. At this time, the output terminal of the cigarette charging module 200 maintains a normal charging voltage and supplies power to the cigarette battery through its output terminal, thus realizing the charging process.

[0029] Meanwhile, since the output of the cigarette charging module 200 maintains a high voltage, and the control terminal of the interrupt reset module 300 is connected to the output of the cigarette charging module 200, the voltage at the control terminal of the interrupt reset module 300 is greater than its conduction threshold voltage. Therefore, the interrupt reset module 300 is in the conducting state. This causes the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ of the microcontroller to be connected to the ground terminal through the interrupt reset module 300. Therefore, even if the interrupt signal terminal SIRQ originally outputs a high level, it will be pulled to a low level, and ultimately both the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ remain at a low level.

[0030] Furthermore, when the e-cigarette battery reaches its full charge threshold, the microcontroller determines that charging is complete based on the power signal fed back from the e-cigarette charging module 200, and the e-cigarette enters standby mode. Then, the microcontroller controls its voltage divider control signal terminal DEV to output a high-level signal to the control terminal of the voltage divider control module 100, causing the voltage at the control terminal of the voltage divider control module 100 to exceed its conduction threshold voltage, thus turning on the voltage divider control module 100. Since the first terminal of the voltage divider control module 100 is connected to both the output terminal of the e-cigarette charging module 200 and the control terminal of the interrupt reset module 300, and the second terminal of the voltage divider control module 100 is grounded, after the voltage divider control module 100 is turned on, the output terminal of the e-cigarette charging module 200 and the control terminal of the interrupt reset module 300 form a loop through the voltage divider control module 100 and the ground terminal, rapidly pulling the voltage at both terminals to a low potential. When the interrupt reset module 300 switches from the on state to the off state, the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ cannot be connected to the ground terminal through the interrupt reset module 300, thereby keeping the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ at a high level.

[0031] Specifically, when the output of the cigarette charging module 200 is pulled low, its internal chip stops unnecessary operations due to insufficient operating voltage, thus avoiding continuous power consumption caused by repeated data overwriting in standby mode. Furthermore, the microcontroller can determine whether it is in standby mode by checking the level of the interrupt signal SIRQ.

[0032] Furthermore, when the user needs to terminate the standby state, the microcontroller's interrupt signal terminal SIRQ changes from high to low. Since the microcontroller's voltage divider control signal terminal DEV is also connected to the microcontroller's interrupt signal terminal SIRQ through the first voltage divider resistor R6, and SIRQ outputs a low level at this time, the high-level signal of the voltage divider control signal terminal DEV will be pulled low by the interrupt signal terminal SIRQ, causing the control terminal of the voltage divider control module 100 to lose the high-level signal and be cut off, thereby allowing the cigarette charging module 200 to resume normal charging.

[0033] The voltage divider circuit 10 of the aforementioned electronic cigarette charging box, after the cigarette device is fully charged, controls the voltage divider control module 100 to conduct through the microcontroller, thereby reducing the output voltage of the cigarette device charging module 200. This causes the internal chip of the cigarette device charging module 200 to stop unnecessary operations due to insufficient operating voltage, thus effectively avoiding the problem of continuous power consumption caused by repeated data overwriting in the standby state of the cigarette device, and extending the usage time of the electronic cigarette and battery life.

[0034] like Figure 1As shown, in one embodiment, the voltage divider control module 100 includes a first electronic switch Q1 and a second voltage divider resistor R1. The first terminal of the first electronic switch Q1 is connected to the output terminal of the cigarette charging module 200, and the control terminal of the first electronic switch Q1 is connected to the voltage divider control signal terminal DEV of the microcontroller through the second voltage divider resistor R1. The second terminal of the first electronic switch Q1 is grounded. In this embodiment, when the microcontroller determines that the cigarette battery is not fully charged and needs to be continuously charged, the voltage divider control signal terminal DEV of the microcontroller outputs a low-level signal. This low-level signal is transmitted to the control terminal of the first electronic switch Q1 through the second voltage divider resistor R1. Since this low-level signal cannot make the control terminal of the first electronic switch Q1 reach the conduction threshold voltage, the first electronic switch Q1 is in the off state. At this time, the output terminal of the cigarette charging module 200 cannot form a loop with the ground terminal through the first electronic switch Q1, thereby ensuring that the output terminal of the cigarette charging module 200 can maintain a normal charging voltage, providing stable power to the cigarette battery and realizing a normal charging process.

[0035] Furthermore, when the battery power of the e-cigarette reaches the full charge threshold, the microcontroller controls its voltage divider control signal terminal DEV to output a high-level signal. This high-level signal is transmitted to the control terminal of the first electronic switch Q1 through the second voltage divider resistor R1, causing its control terminal voltage to exceed the conduction threshold voltage, thus turning on the first electronic switch Q1. The turned-on first electronic switch Q1 connects the output terminal of the e-cigarette charging module 200 to the ground terminal, forming a grounding loop. This rapidly pulls down the output voltage of the e-cigarette charging module 200, preventing continuous power consumption caused by repeated data overwriting in standby mode. Simultaneously, the second voltage divider resistor R1 also limits the current flowing into the control terminal of the first electronic switch Q1, preventing excessive current from damaging the first electronic switch Q1 and protecting it. This ensures stable operation of the circuit under various working conditions, improving the circuit's reliability and stability.

[0036] like Figure 1As shown, in one embodiment, the voltage divider control module 100 further includes a third voltage divider resistor R2. The first end of the third voltage divider resistor R2 is connected to the control terminal of the first electronic switch Q1, and the second end of the third voltage divider resistor R2 is grounded. In this embodiment, when the voltage divider control signal terminal DEV of the microcontroller outputs a level signal, the third voltage divider resistor R2 and the second voltage divider resistor R1 work together to accurately divide the voltage output from the microcontroller's DEV terminal to the control terminal of the first electronic switch Q1. Specifically, when the microcontroller outputs a low-level signal to turn off the first electronic switch Q1, the third voltage divider resistor R2 can ensure that the voltage at the control terminal is stable at a low level, avoiding accidental conduction of the first electronic switch Q1 due to voltage fluctuations at the control terminal caused by external interference or other factors. This ensures the stability of the first electronic switch Q1's off state during charging, thereby enabling the cigarette charging module 200 to continuously provide a stable charging voltage to the cigarette battery.

[0037] like Figure 1 As shown, in one embodiment, the first electronic switch Q1 is an N-channel MOSFET. In this embodiment, the first terminal of the first electronic switch Q1 is the drain of the N-channel MOSFET, the second terminal of the first electronic switch Q1 is the source of the N-channel MOSFET, and the control terminal of the first electronic switch Q1 is the gate of the N-channel MOSFET. When the microcontroller determines that the battery power of the cigarette device has reached the full charge threshold and controls its voltage divider control signal terminal DEV to output a high-level signal to the gate, the high-level signal causes the voltage difference between the gate and the source to reach or exceed its conduction threshold voltage. The N-channel MOSFET can quickly conduct, forming a low-impedance channel between the drain and the source. The output terminal of the cigarette device charging module 200 and the ground terminal quickly form a loop, and its output voltage is quickly pulled down, thereby stopping unnecessary operations in time and preventing the cigarette device from continuously consuming power in standby mode. Similarly, when charging needs to be resumed, the microcontroller sets its voltage divider control signal terminal DEV to a low level, which allows the N-channel MOSFET to quickly turn off, cutting off the grounding circuit and restoring the cigarette charging module 200 to normal charging status, ensuring the efficiency and timeliness of the charging process.

[0038] like Figure 1As shown, in one embodiment, the cigarette charging module 200 includes a cigarette charging component and a fourth voltage divider resistor R3. The input terminal of the cigarette charging component is used to connect to an external power source, and the output terminal of the cigarette charging component is grounded through the fourth voltage divider resistor R3. In this embodiment, during the normal charging phase of the cigarette, the output terminal of the cigarette charging component maintains a normal charging voltage. At this time, the fourth voltage divider resistor R3 acts as a voltage sampling resistor, which can cooperate with the microcontroller to detect the output voltage. At the same time, the fourth voltage divider resistor R3 can act as a dummy load to prevent the charging component from being unloaded. If the cigarette battery is not connected, the fourth voltage divider resistor R3 can prevent the charging component from experiencing voltage abnormalities due to an open circuit at the output terminal, indirectly protecting the internal chip of the charging component and preventing damage to the core charging component due to high voltage under no-load conditions.

[0039] like Figure 1 As shown, in one embodiment, the interrupt reset module 300 includes a second electronic switch Q2 and a fifth voltage divider resistor R4. The first terminal of the second electronic switch Q2 is connected to the interrupt signal terminal SIRQ of the microcontroller and one end of the first voltage divider resistor R6, respectively. The control terminal of the second electronic switch Q2 is connected to the output terminal of the cigarette charging module 200 through the fifth voltage divider resistor R4, and the second terminal of the second electronic switch Q2 is grounded. During the normal charging phase of the cigarette, the output terminal of the cigarette charging module 200 maintains a normal charging voltage. At this time, the voltage at the output terminal of the cigarette charging module 200 is transmitted to the control terminal of the second electronic switch Q2 through the fifth voltage divider resistor R4. Since this voltage is greater than the conduction threshold voltage of the second electronic switch Q2, the second electronic switch Q2 is in the conducting state. This allows the microcontroller's voltage divider control signal terminal DEV and interrupt signal terminal SIRQ to be connected to the ground terminal through the second electronic switch Q2, pulling the interrupt signal terminal SIRQ from a potentially high level to a low level. This ensures that both the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ remain at a low level, thereby guaranteeing the stability of the circuit state during charging and avoiding instability caused by signal interference, thus providing a reliable guarantee for the stable charging of the cigarette battery.

[0040] When the e-cigarette battery reaches its full charge threshold, the microcontroller controls the voltage divider control module 100 to turn on, rapidly pulling down the output voltage of the e-cigarette charging module 200. At this time, the voltage at the control terminal of the second electronic switch Q2 decreases accordingly. When it falls below its turn-on threshold voltage, the second electronic switch Q2 switches from the on state to the off state. The voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ cannot be connected to the ground terminal through the second electronic switch Q2, thus keeping both the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ at a high level. Furthermore, the microcontroller can accurately determine whether the e-cigarette is in standby mode by observing the level of the interrupt signal terminal SIRQ, achieving a fast and accurate response to the charging status and improving the intelligent control level of the circuit.

[0041] When the user needs to terminate the standby state, the microcontroller's interrupt signal terminal SIRQ changes from high to low. Since the microcontroller's voltage divider control signal terminal DEV is also connected to the interrupt signal terminal SIRQ through the first voltage divider resistor R6, the low level output by SIRQ pulls the high-level signal of the voltage divider control signal terminal DEV to low, causing the control terminal of the voltage divider control module 100 to lose its high-level signal and cut off, thereby restoring the cigarette charging module 200 to normal charging state. During this process, the second electronic switch Q2 flexibly switches between on and off states according to changes in its control terminal voltage, ensuring a smooth resumption of charging and avoiding the impact of voltage fluctuations caused by state switching on the circuit and the cigarette battery.

[0042] Furthermore, the fifth voltage divider resistor R4 plays a crucial role in precisely regulating the voltage at the control terminal of the second electronic switch Q2. It transmits the appropriate voltage to the control terminal of the second electronic switch Q2 based on changes in the output voltage of the cigarette charging module 200, ensuring that the second electronic switch Q2 responds accurately under different operating conditions, thereby improving the stability and reliability of the circuit.

[0043] like Figure 1 As shown, in one embodiment, the interrupt reset module 300 further includes a current-limiting resistor R5. The first end of the current-limiting resistor R5 is connected to the control terminal of the second electronic switch Q2, and the second end of the current-limiting resistor R5 is grounded. In this embodiment, during circuit operation, the current at the control terminal of the second electronic switch Q2 has a significant impact on its operating state. When the microcontroller controls the second electronic switch Q2 through relevant signals, the current-limiting resistor R5 ensures that the current flowing into the control terminal is not excessive, preventing damage to the second electronic switch Q2 due to current overload and ensuring that the second electronic switch Q2 operates in a stable current environment. In addition, when the e-cigarette battery is close to full charge and the circuit state changes, the current-limiting resistor R5 can prevent the second electronic switch Q2 from malfunctioning due to sudden current changes, ensuring that it accurately performs conduction or cutoff operations according to the microcontroller's instructions, thereby ensuring that the voltage divider circuit 10 of the electronic cigarette charging box can operate stably in different states such as charging, standby, and resuming charging.

[0044] like Figure 1As shown, in one embodiment, the second electronic switch Q2 is an NPN transistor. In this embodiment, the first terminal of the second electronic switch Q2 is the collector of the NPN transistor, the second terminal of the second electronic switch Q2 is the emitter of the NPN transistor, and the control terminal of the second electronic switch Q2 is the base of the NPN transistor. During the normal charging phase of the cigarette device, the output terminal of the cigarette device charging module 200 maintains a normal charging voltage, which is applied to the base of the NPN transistor after being divided by the fifth voltage divider resistor R4. Since the base voltage is greater than its conduction threshold voltage at this time, the NPN transistor quickly conducts, forming a low-impedance path between the collector and emitter. This allows the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ of the microcontroller to be connected to the ground terminal through the conducting transistor, pulling the high level that the interrupt signal terminal SIRQ might have originally been at to a low level, ensuring that both the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ remain at a low level. This state ensures the stability of the circuit during charging, avoiding instability caused by signal interference and providing a reliable guarantee for stable charging of the cigarette holder battery. At the same time, the NPN transistor has high current amplification capability, enabling it to quickly respond to changes in base voltage, ensuring stable signal transmission during the charging phase and improving the circuit's response speed.

[0045] Furthermore, when the e-cigarette battery reaches its full charge threshold, the microcontroller controls the voltage divider control module 100 to conduct, rapidly pulling down the output voltage of the e-cigarette charging module 200. At this time, the base voltage of the NPN transistor decreases accordingly. When it falls below its conduction threshold voltage, the transistor switches from the on state to the off state. The collector and emitter become highly impeded, preventing the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ from connecting to ground through the transistor, thus keeping both terminals high. The microcontroller can accurately determine whether the e-cigarette is in standby mode based on the level of the interrupt signal terminal SIRQ, achieving a fast and accurate response to the charging status.

[0046] like Figure 1 As shown, in one embodiment, the current-limiting resistor R5 is an adjustable resistor. In this embodiment, the use of an adjustable resistor R5 allows the voltage divider circuit 10 of the electronic cigarette charging case to adapt to different specifications and models of electronic cigarette products. Different electronic cigarettes may have different charging modules 200 and microcontrollers, and their current requirements may also differ. The adjustable resistor R5 can be adjusted according to the specific product requirements, enabling the circuit to match well with various electronic cigarettes without requiring large-scale circuit redesign, thus improving the circuit's versatility and applicability.

[0047] This application also provides an electronic cigarette charging device, including the voltage divider circuit 10 of the electronic cigarette charging box according to any of the above embodiments. In this embodiment, when an external power source is connected to the input terminal of the cigarette charging module 200 and the cigarette battery is not fully charged, the microcontroller determines that continuous charging is required. At this time, the voltage divider control signal terminal DEV of the microcontroller outputs a low-level signal to the control terminal of the voltage divider control module 100, and the interrupt signal terminal SIRQ of the microcontroller outputs a high-level signal. Since the control terminal of the voltage divider control module 100 is connected to the voltage divider control signal terminal DEV of the microcontroller, the low-level signal output by the voltage divider control signal terminal DEV of the microcontroller prevents the control terminal of the voltage divider control module 100 from reaching the conduction threshold voltage. Therefore, the voltage divider control module 100 is in a cut-off state and cannot form a grounding loop. At this time, the output terminal of the cigarette charging module 200 maintains a normal charging voltage and supplies power to the cigarette battery through its output terminal to realize the charging process. Meanwhile, since the output of the cigarette charging module 200 maintains a high voltage, and the control terminal of the interrupt reset module 300 is connected to the output of the cigarette charging module 200, the voltage at the control terminal of the interrupt reset module 300 is greater than its conduction threshold voltage, thus the interrupt reset module 300 is in the conducting state. This causes the microcontroller's voltage divider control signal terminal DEV and interrupt signal terminal SIRQ to be connected to the ground terminal through the interrupt reset module 300. Therefore, even if the interrupt signal terminal SIRQ originally output a high level, it will be pulled to a low level, and ultimately both the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ remain at a low level. Furthermore, when the cigarette battery reaches the full charge threshold, the microcontroller determines that charging is complete based on the power signal fed back by the cigarette charging module 200, and the cigarette enters a standby state. Then, the microcontroller controls its voltage divider control signal terminal DEV to output a high-level signal to the control terminal of the voltage divider control module 100, making the voltage at the control terminal of the voltage divider control module 100 greater than its conduction threshold voltage, and the voltage divider control module 100 is turned on. Since the first terminal of the voltage divider control module 100 is connected to the output terminal of the cigarette charging module 200 and the control terminal of the interrupt reset module 300 respectively, and the second terminal of the voltage divider control module 100 is grounded, when the voltage divider control module 100 is turned on, the output terminal of the cigarette charging module 200 and the control terminal of the interrupt reset module 300 will form a loop with the ground terminal through the voltage divider control module 100, and the voltage of the output terminal of the cigarette charging module 200 and the control terminal of the interrupt reset module 300 will be quickly pulled to a low potential. When the interrupt reset module 300 switches from the on state to the off state, the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ cannot be connected to the ground terminal through the interrupt reset module 300, thus keeping the voltage divider control signal terminal DEV and the interrupt signal terminal SIRQ at a high level.Specifically, when the output of the cigarette charging module 200 is pulled low, its internal chip stops unnecessary operations due to insufficient operating voltage, thus avoiding continuous power consumption caused by repeated data overwriting in standby mode. Furthermore, the microcontroller can determine whether it is in standby mode by checking the level of the interrupt signal SIRQ. Further, when the user needs to terminate the standby mode, the microcontroller's interrupt signal SIRQ changes from high to low. Since the microcontroller's voltage divider control signal DEV is also connected to the microcontroller's interrupt signal SIRQ through the first voltage divider resistor R6, and SIRQ outputs a low level at this time, the high-level signal of the voltage divider control signal DEV is pulled low by the interrupt signal SIRQ, causing the control terminal of the voltage divider control module 100 to lose its high-level signal and cut off, thereby restoring the cigarette charging module 200 to normal charging mode.

[0048] Compared with the prior art, this disclosure has at least the following advantages:

[0049] The voltage divider circuit 10 of the aforementioned electronic cigarette charging box, after the cigarette device is fully charged, controls the voltage divider control module 100 to conduct through the microcontroller, thereby reducing the output voltage of the cigarette device charging module 200. This causes the internal chip of the cigarette device charging module 200 to stop unnecessary operations due to insufficient operating voltage, thus effectively avoiding the problem of continuous power consumption caused by repeated data overwriting in the standby state of the cigarette device, and extending the usage time of the electronic cigarette and battery life.

[0050] 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 voltage divider circuit for an electronic cigarette charging case, characterized in that, It includes a voltage divider control module, a cigarette holder charging module, a first voltage divider resistor, and an interrupt reset module. The first terminal of the voltage divider control module is connected to the output terminal of the cigarette charging module, the input terminal of the cigarette charging module is used to connect to an external power source, the second terminal of the voltage divider control module is grounded, and the control terminal of the voltage divider control module is used to connect to the voltage divider control signal terminal of the microcontroller. The voltage divider control signal terminal of the microcontroller is connected to the first terminal of the interrupt reset module through the first voltage divider resistor. The first terminal of the interrupt reset module is also used to connect to the interrupt signal terminal of the microcontroller. The control terminal of the interrupt reset module is connected to the output terminal of the cigarette charging module and the first terminal of the voltage divider control module, respectively. The second terminal of the interrupt reset module is grounded.

2. The voltage divider circuit for the electronic cigarette charging case according to claim 1, characterized in that, The voltage divider control module includes a first electronic switch and a second voltage divider resistor. The first end of the first electronic switch is connected to the output end of the cigarette rod charging module. The control end of the first electronic switch is connected to the voltage divider control signal end of the microcontroller through the second voltage divider resistor. The second end of the first electronic switch is grounded.

3. The voltage divider circuit for the electronic cigarette charging case according to claim 2, characterized in that, The voltage divider control module further includes a third voltage divider resistor, the first end of which is connected to the control terminal of the first electronic switch tube, and the second end of which is grounded.

4. The voltage divider circuit for the electronic cigarette charging case according to claim 2, characterized in that, The first electronic switch is an N-channel MOS transistor.

5. The voltage divider circuit for the electronic cigarette charging case according to claim 1, characterized in that, The cigarette charging module includes a cigarette charging component and a fourth voltage divider resistor. The input terminal of the cigarette charging component is used to connect to an external power source, and the output terminal of the cigarette charging component is grounded through the fourth voltage divider resistor.

6. The voltage divider circuit for the electronic cigarette charging case according to claim 1, characterized in that, The interrupt reset module includes a second electronic switch and a fifth voltage divider resistor. The first end of the second electronic switch is connected to the interrupt signal terminal of the microcontroller and one end of the first voltage divider resistor, respectively. The control terminal of the second electronic switch is connected to the output terminal of the cigarette charging module through the fifth voltage divider resistor. The second end of the second electronic switch is grounded.

7. The voltage divider circuit for an electronic cigarette charging case according to claim 6, characterized in that, The interrupt reset module also includes a current-limiting resistor, the first end of which is connected to the control terminal of the second electronic switch, and the second end of which is grounded.

8. The voltage divider circuit for an electronic cigarette charging case according to claim 6, characterized in that, The second electronic switch is an NPN transistor.

9. The voltage divider circuit for an electronic cigarette charging case according to claim 7, characterized in that, The current-limiting resistor is an adjustable resistor.

10. An electronic cigarette charging device, characterized in that, Includes the voltage divider circuit for an electronic cigarette charging case as described in any one of claims 1 to 9.

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