Charging management device of electronic cigarette

Abstract

The invention relates to the technical field of electronic cigarettes and charging management chips, and provides an electronic cigarette charging management device which comprises a state pin, a state controller circuit and an MCU chip circuit. When the connection state of the state pin and the battery VBAT is changed, four charging states are output according to the connection change state, namely, non-charging, charging, full charging and overvoltage protection. The state controller circuit is connected with the state pin, and is connected with the battery VBAT and the ground GND; the state controller circuit detects the state of the battery VBAT, controls the connection state of the state pin and the battery VBAT to change according to the state of the battery VBAT, and transmits four charging states to the state pin; the MCU chip circuit is electrically connected with the state pin and is used for obtaining any one of the four charging states output by the state pin for analysis and judgment so as to obtain the current charging state of the electronic cigarette for current charging state indication, so that peripheral circuits are reduced, the circuit cost is reduced, and the stability of the circuit is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic cigarettes, charging management chips, etc., and in particular relates to a charging management device for an electronic cigarette. Background Art

[0002] The electronic cigarette solution board is equipped with charging management, display module, MCU, and field effect tube output atomization module. When the electronic cigarette is charging, it is necessary to collect the current charging status, which includes four main types: uncharged, charging, fully charged, and overvoltage protection (OverVoltage Protection). The current charging management chip can only indicate the two states of charging and fully charged. Additional peripheral circuits are required to collect the two states of uncharged and overvoltage protection. The main principle is as follows: The input voltage VCC is divided by the voltage divider circuit and input to the MCU. The MCU collects the voltage after the voltage divider to determine whether it is uncharged or in the overvoltage protection state. In normal use scenarios, due to the popularity of fast charging and car charging, using TYPE-C for charging may cause VCC high voltage. Typical voltages of VCC include: 5V, 9V, 12V, 24V, and 32V. The normal working voltage of electronic cigarette charging is 5V. The conventional charging management chip itself has an overvoltage protection (Over Voltage Protection) function. When the input voltage VCC is detected to be greater than 7V (general typical value), the charging management chip will shut down the charging in time. VCC is connected to the MCU through a voltage divider circuit. The power supply battery of the MCU is a 3.7V polymer battery with a maximum voltage of 4.2V. In the scenario of overvoltage protection, the voltage of VCC may be as high as 32V. Even through the voltage divider circuit, the voltage VCC will far exceed the maximum operating voltage of the MCU, affecting the stability of the MCU and causing unknown reliability anomalies. Therefore, traditional charging management chips cannot directly integrate the four functions (uncharged, charging, fully charged, and overvoltage protection). They need to be implemented by peripheral circuits, and the stability and reliability of the peripheral circuits also have certain risks, and the circuit cost is high. When performing such applications, the indication method of such traditional charging management chips is not the most ideal solution.

[0003] In summary, the existing detection technology for the four charging states of electronic cigarettes has technical problems such as reliance on peripheral circuits, low stability, and high circuit costs. Application Contents

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a charging management device for an electronic cigarette to reduce peripheral circuits, lower circuit costs, and improve circuit stability.

[0005] The present invention provides a charging management device for an electronic cigarette, comprising:

[0006] A status pin, wherein when the connection state of the status pin with the battery VBAT changes, the status pin outputs four charging states according to the connection change state, and the four charging states include uncharged, charging, fully charged and overvoltage protection;

[0007] A state controller circuit is electrically connected to the state pin, and is electrically connected to the battery VBAT and ground GND; the state controller circuit detects the state of the battery VBAT, and controls the connection state between the state pin and the battery VBAT to change according to the state of the battery VBAT, and transmits the four charging states to the state pin;

[0008] The MCU chip circuit is electrically connected to the status pin and is used to obtain any one of the four charging states output by the status pin for analysis and judgment, so as to obtain the current charging state of the electronic cigarette and indicate the current charging state.

[0009] Furthermore, the status pins include a status pin 1 and a status pin 2; when the connection status of the status pin 1 and the status pin 2 with the battery VBAT changes, the four charging states are output according to the connection change status.

[0010] Further, when the state controller circuit detects that the battery VBAT is not connected to the charging circuit, it controls the state pin 1 and the state pin 2 to be connected to the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a high level, indicating that the state pin outputs the uncharged state among the four charging states.

[0011] Further, when the state controller circuit detects that the battery VBAT is in a charging state, it controls the state pin 1 to be connected to the battery VBAT and the state pin 2 to be disconnected from the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a low level, indicating that the state pin outputs a charging indication signal in the four charging states.

[0012] Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state that has reached a fully charged threshold, the state controller circuit controls the state pin 1 to be disconnected from the battery VBAT and the state pin 2 to be connected to the battery VBAT. At this time, the state pin 1 outputs a low level and the state pin 2 outputs a high level, indicating that the state pin outputs a fully charged indication signal among the four charging states.

[0013] Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state exceeding the safe charging voltage threshold, it controls the state pin 1 to be disconnected from the battery VBAT, and the state pin 2 to be disconnected from the battery VBAT. At this time, the state pin 1 outputs a low level, and the state pin 2 outputs a low level, indicating that the state pin outputs the overvoltage protection indication signal in the four charging states.

[0014] Furthermore, the status pins include a single status pin; when the connection state of the single status pin with the battery VBAT changes, the four charging states are output according to the connection change state.

[0015] Further, when the state controller circuit detects that the battery VBAT is not connected to the charging circuit, it controls the single state pin to be disconnected from the battery VBAT and connected to the ground GND. At this time, the single state pin is connected to the ground GND, indicating that the state pin outputs the uncharged state among the four charging states.

[0016] Further, when the state controller circuit detects that the battery VBAT is in a charging state, it controls the single state pin to be connected to the battery VBAT and outputs a battery voltage of 1 / 3*VBAT, indicating that the state pin outputs a charging indication signal in the four charging states.

[0017] Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state where it has reached a fully charged threshold, the single state pin is controlled to be connected to the battery VBAT, and a battery voltage of 2 / 3*VBAT is output, indicating that the state pin outputs a fully charged indication signal in the four charging states; when the state controller circuit detects that the voltage of the battery VBAT is in a state where it exceeds a safe charging voltage threshold, the single state pin is controlled to be connected to the battery VBAT, and the full voltage of the battery VBAT is output, indicating that the state pin outputs an overvoltage protection indication signal in the four charging states.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a charging management device for an electronic cigarette, comprising: a state pin, a state controller circuit, and an MCU chip circuit. When the connection state of the state pin with a battery VBAT changes, four charging states are output according to the connection change state, and the four charging states include uncharged, charging, fully charged, and overvoltage protection; the state controller circuit is electrically connected to the state pin, and is electrically connected to the battery VBAT and a ground GND; the state controller circuit detects the state of the battery VBAT, and controls the connection state of the state pin with the battery VBAT to change according to the state of the battery VBAT, and transmits the four charging states to the state pin; the MCU chip circuit is electrically connected to the state pin, and is used to obtain any one of the four charging states output by the state pin for analysis and judgment, so as to obtain the current charging state of the electronic cigarette and indicate the current charging state, thereby reducing peripheral circuits, reducing circuit costs, and improving circuit stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Some specific embodiments of the present invention will be described in detail in an exemplary and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 This is a schematic diagram of a circuit structure of a charging management device for an electronic cigarette according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of a circuit structure in which a state controller circuit according to an embodiment of the present invention is connected to two state pins;

[0023] Figure 3 It is a schematic diagram of a circuit structure in which a state controller circuit according to an embodiment of the present invention is connected to a single state pin;

[0024] Figure 4 It is a schematic diagram of the level combination of two state pins in four charging states in an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of the voltage output of a single state pin in four charging states according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention. Embodiment 1

[0027] See also Figure 1-Figure 5 , this embodiment provides a charging management device for an electronic cigarette, the charging management device for an electronic cigarette includes: a status pin, a status controller circuit and an MCU chip circuit. When the connection state of the status pin with the battery VBAT changes, four charging states are output according to the connection change state, and the four charging states include uncharged, charging, fully charged and overvoltage protection; the status controller circuit is electrically connected to the status pin, and is electrically connected to the battery VBAT and the ground GND; the status controller circuit detects the state of the battery VBAT, and controls the connection state of the status pin with the battery VBAT to change according to the state of the battery VBAT, and transmits the four charging states to the status pin; the MCU chip circuit is electrically connected to the status pin, and is used to obtain any one of the four charging states output by the status pin for analysis and judgment, so as to obtain the current charging state of the electronic cigarette and indicate the current charging state, thereby reducing peripheral circuits, reducing circuit costs, and improving circuit stability. Embodiment 2

[0028] See also Figure 1-Figure 5, based on the first embodiment, in this embodiment, the state pin includes a state pin 1 and a state pin 2; when the connection state of the state pin 1 and the state pin 2 with the battery VBAT changes, the four charging states are output according to the connection change state. Further, when the state controller circuit detects that the battery VBAT is not connected to the charging circuit, the state pin 1 and the state pin 2 are controlled to be connected to the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a high level, indicating that the state pin outputs the uncharged state among the four charging states. Further, when the state controller circuit detects that the battery VBAT is in a charging state, the state pin 1 is controlled to be connected to the battery VBAT and the state pin 2 is disconnected from the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a low level, indicating that the state pin outputs the charging indication signal among the four charging states. Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state that has reached the threshold of full charge, the state pin 1 is controlled to be disconnected from the battery VBAT, and the state pin 2 is connected to the battery VBAT. At this time, the state pin 1 outputs a low level, and the state pin 2 outputs a high level, indicating that the state pin outputs a fully charged indication signal in the four charging states. Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state that exceeds the safe charging voltage threshold, the state pin 1 is controlled to be disconnected from the battery VBAT, and the state pin 2 is disconnected from the battery VBAT. At this time, the state pin 1 outputs a low level, and the state pin 2 outputs a low level, indicating that the state pin outputs an overvoltage protection indication signal in the four charging states.

[0029] It should be noted that, in this embodiment, two pins are used as status pins to indicate four states. The high and low levels of the two pins change. The MCU chip circuit only needs to connect the pins to these two status pins, and judge the high and low of the pins to judge the current charging state, thereby realizing the indication of the charging state.

[0030] In some preferred embodiments, when the state pin includes a state pin 1 and a state pin 2, the state controller circuit includes a pull-up resistor R1, a pull-up resistor R2, a field effect transistor Q1, a field effect transistor Q2 and a state controller; one end of the pull-up resistor R1 is connected to the battery VBAT, and the other end is connected to the drain of the field effect transistor Q1 and the state pin 1; one end of the pull-up resistor R2 is connected to the battery VBAT, and the other end is connected to the drain of the field effect transistor Q2 and the state pin 2; the gate of the field effect transistor Q1 is connected to the state controller, and the source of the field effect transistor Q1 is connected to the ground GND; the gate of the field effect transistor Q2 is connected to the state controller, and the source of the field effect transistor Q2 is connected to the ground GND. It should be noted that in this embodiment, in the uncharged state, the battery VBAT is not connected to the charging circuit. After the state controller detects this situation, it will set both field effect transistors to the off state by controlling the gate of the field effect transistor. Since both field effect transistors are turned off, both state pin 1 and state pin 2 are pulled up to the VBAT voltage (high level). In this way, both state pin 1 and state pin 2 are high level.

[0031] When the battery is being charged, the state controller detects that the battery voltage is rising and current is flowing into the battery. The state controller controls the gate of the left field effect transistor Q1 to keep it closed, thereby keeping the state pin 1 at a high level (VBAT). At the same time, the state controller turns on the right field effect transistor Q2 to connect the state pin 2 to the ground (GND). In this way, the level of the state pin 2 becomes a low level (GND). Through this control method, the state combination of the state pin 1 being high (VBAT) and the state pin 2 being low (GND) can be achieved. When the battery is fully charged, the state controller detects that the battery voltage has reached the fully charged threshold and the current has dropped to a very small value. The state controller turns off the left field effect transistor Q1 and turns on the right field effect transistor Q2. In this way, the state pin 1 is grounded (GND) through the left field effect transistor, so the level is low. At the same time, the state pin 2 is maintained at a high level (VBAT) through the pull-up resistor. Therefore, this combination realizes the state of the state pin 1 being low and the state pin 2 being high. When the state controller detects that the battery voltage exceeds the safety threshold, it enables the overvoltage protection mechanism. At this time, the state controller turns on the field effect tubes Q1 and Q2 on the left and right sides, so that both state pins 1 and 2 are grounded (GND). Therefore, the levels of these two pins will be pulled down to GND to achieve a low-level combination of overvoltage protection state. It can be understood that in this embodiment, the field effect tube acts as a switch in the state controller circuit to control whether the circuit node (state pin 1 and state pin 2) is connected to the battery (VBAT) or the ground (GND). The state controller controls the on and off of the field effect tube by adjusting the gate voltage of the field effect tube, thereby achieving different level combinations. The state controller adjusts the state of the field effect tube according to the charging state of the battery (uncharged, charging, fully charged and overvoltage), thereby controlling the level of state pins 1 and 2. The advantage of this circuit design is that the MCU chip circuit only needs to detect the level state of the two state pins, and does not require complex voltage or current measurements to easily determine the current state of the battery. Embodiment 3

[0032] See also Figure 1-Figure 5, based on the first embodiment, in this embodiment, the status pin includes a single status pin; when the connection state of the single status pin with the battery VBAT changes, the four charging states are output according to the connection change state. Further, when the state controller circuit detects that the battery VBAT is not connected to the charging circuit, the single status pin is controlled to be disconnected from the battery VBAT and connected to the ground GND. At this time, the single status pin is connected to the ground GND, indicating that the status pin outputs the uncharged state among the four charging states. Further, when the state controller circuit detects that the battery VBAT is in a charging state, the single status pin is controlled to be connected to the battery VBAT and output a battery voltage of 1 / 3*VBAT, indicating that the status pin outputs a charging indication signal among the four charging states. Further, when the state controller circuit detects that the voltage of the battery VBAT is in a state where it has reached the threshold of full charge, the single state pin is controlled to be connected to the battery VBAT, and a battery voltage of 2 / 3*VBAT is output, indicating that the state pin outputs a fully charged indication signal in the four charging states; when the voltage of the battery VBAT is detected to be in a state where it exceeds the safe charging voltage threshold, the single state pin is controlled to be connected to the battery VBAT, and the full voltage of the battery VBAT (i.e., the battery voltage of VBAT is output), indicating that the state pin outputs an overvoltage protection indication signal in the four charging states. It should be noted that, in this embodiment, a single state pin is used as the state pin to indicate four states, and the voltage of the battery VBAT is equally divided. When the battery VBAT is in different states, the voltage of the pin is different, and the MCU only needs to collect the voltage of the single state pin to determine the current charging state.

[0033] In some preferred embodiments, when the state pin includes a single state foot, the state controller circuit includes a voltage divider resistor R3, a voltage divider resistor R4, a voltage divider resistor R5 and a state controller; the voltage divider resistor R3, the voltage divider resistor R4 and the voltage divider resistor R5 are connected in series, the voltage divider resistor R3 is connected to the battery VBAT, and the voltage divider resistor R5 is connected to the ground GND; both ends of each resistor in the voltage divider resistor R3, the voltage divider resistor R4 and the voltage divider resistor R5 are connected to the state controller, and the output end of the state controller is connected to the single state foot. It should be noted that in this embodiment, the indication of four charging states is realized by a single state foot. Specifically, the circuit distributes and outputs different voltage values ​​through the voltage divider resistor and the state controller, thereby realizing the indication of the charging state. Among them, the voltage divider resistor R3, the voltage divider resistor R4 and the voltage divider resistor R5 are connected in series to form a voltage divider circuit. R3 is connected to the battery VBAT, R5 is grounded (GND), and R4 is located between R3 and R5. This voltage divider network is used to divide the battery voltage proportionally according to the instructions of the state controller, thereby outputting different voltage values. The state controller monitors the state of the battery (not charged, charging, fully charged, overvoltage protection), and controls the voltage of the output terminal according to the state of the battery. In this embodiment, the state controller switches the connection point of the output terminal according to the battery state, thereby changing the voltage of the single state foot. When the state controller detects that the battery VBAT is not connected to the charging circuit (not charged), it controls the single state foot to be connected to the ground (GND). Since the single state foot is pulled to the ground level, its voltage is 0V, indicating the uncharged state. When the state controller detects that the battery is charging, it controls the single state foot to be connected to a node of the voltage divider resistor network (usually the node between R4 and R5) to output a voltage of 1 / 3 * VBAT. This voltage value is used to represent the charging state, and the MCU chip circuit can identify this state by detecting the voltage of the single state foot. When the battery reaches the fully charged threshold, the state controller connects the single state foot to another voltage divider node (usually the node between R3 and R4) and outputs a voltage of 2 / 3 * VBAT. This specific voltage value is used to indicate that the battery is fully charged, and the MCU chip circuit can also identify this state by measuring the voltage of the single state foot. If the state controller detects that the battery voltage exceeds the safety threshold, it will connect a single state pin directly to the battery VBAT, thereby outputting the voltage of VBAT (i.e., the full voltage of the battery). By outputting the full VBAT voltage, the state pin can indicate the overvoltage protection state. It can be understood that in this embodiment, the indication of four different states is achieved through a state pin and a voltage divider resistor network, which reduces the number of pins, thereby simplifying the circuit design and the interface requirements of the MCU.By dividing the battery VBAT voltage into 1 / 3, 2 / 3 and full voltage (VBAT), each state corresponds to a clear voltage value, so that the MCU chip circuit can judge the current battery state through simple voltage sampling, reducing complex logical judgments and improving the reliability and stability of detection. Since only one state pin is required, the MCU's I / O pins can be saved, which is especially advantageous for small MCUs of electronic cigarettes with limited resources. At the same time, the design of the voltage divider resistor network is simple and low-cost, making the entire circuit highly cost-effective.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charging management device for an electronic cigarette, comprising: A status pin, wherein when the connection state of the status pin with the battery VBAT changes, the status pin outputs four charging states according to the connection change state, and the four charging states include uncharged, charging, fully charged and overvoltage protection; A state controller circuit is electrically connected to the state pin, and is electrically connected to the battery VBAT and ground GND; the state controller circuit detects the state of the battery VBAT, and controls the connection state between the state pin and the battery VBAT to change according to the state of the battery VBAT, and transmits the four charging states to the state pin; The MCU chip circuit is electrically connected to the status pin and is used to obtain any one of the four charging states output by the status pin for analysis and judgment, so as to obtain the current charging state of the electronic cigarette and indicate the current charging state.

2. The electronic cigarette charging management device according to claim 1, characterized in that: The state pins include a state pin 1 and a state pin 2; when the connection state of the state pin 1 and the state pin 2 with the battery VBAT changes, the four charging states are output according to the connection change state.

3. The electronic cigarette charging management device according to claim 2, characterized in that: When the state controller circuit detects that the battery VBAT is not connected to the charging circuit, it controls the state pin 1 and the state pin 2 to be connected to the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a high level, indicating that the state pin outputs the uncharged state among the four charging states.

4. The electronic cigarette charging management device according to claim 2, characterized in that: When the state controller circuit detects that the battery VBAT is in a charging state, it controls the state pin 1 to be connected to the battery VBAT and the state pin 2 to be disconnected from the battery VBAT. At this time, the state pin 1 outputs a high level and the state pin 2 outputs a low level, indicating that the state pin outputs a charging indication signal in the four charging states.

5. The electronic cigarette charging management device according to claim 2, characterized in that: When the state controller circuit detects that the voltage of the battery VBAT is in a state that has reached the fully charged threshold, the state controller circuit controls the state pin 1 to be disconnected from the battery VBAT and the state pin 2 to be connected to the battery VBAT. At this time, the state pin 1 outputs a low level and the state pin 2 outputs a high level, indicating that the state pin outputs a fully charged indication signal in the four charging states.

6. The electronic cigarette charging management device according to claim 2, characterized in that: When the state controller circuit detects that the voltage of the battery VBAT is in a state exceeding the safe charging voltage threshold, it controls the state pin 1 to be disconnected from the battery VBAT, and the state pin 2 to be disconnected from the battery VBAT. At this time, the state pin 1 outputs a low level, and the state pin 2 outputs a low level, indicating that the state pin outputs an overvoltage protection indication signal in the four charging states.

7. The electronic cigarette charging management device according to claim 1, characterized in that: The state pins include a single state pin; when the connection state of the single state pin with the battery VBAT changes, the single state pin outputs the four charging states according to the connection change state.

8. The electronic cigarette charging management device according to claim 7, characterized in that: When the state controller circuit detects that the battery VBAT is not connected to the charging circuit, it controls the single state pin to be disconnected from the battery VBAT and connected to the ground GND. At this time, the single state pin is connected to the ground GND, indicating that the state pin outputs the uncharged state among the four charging states.

9. The electronic cigarette charging management device according to claim 7, characterized in that: When the state controller circuit detects that the battery VBAT is in a charging state, it controls the single state pin to be connected to the battery VBAT and outputs a battery voltage of 1 / 3*VBAT, indicating that the state pin outputs a charging indication signal in the four charging states.

10. The electronic cigarette charging management device according to claim 7, characterized in that: When the state controller circuit detects that the voltage of the battery VBAT is in a state where it has reached a fully charged threshold, the single state pin is controlled to be connected to the battery VBAT, and a battery voltage of 2 / 3*VBAT is output, indicating that the state pin outputs a fully charged indication signal in the four charging states; when the state controller circuit detects that the voltage of the battery VBAT is in a state where it exceeds a safe charging voltage threshold, the single state pin is controlled to be connected to the battery VBAT, and the full voltage of the battery VBAT is output, indicating that the state pin outputs an overvoltage protection indication signal in the four charging states.

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