MOS transistor-based e-cigarette power control circuit and e-cigarette

Abstract

The present invention relates to the technical field of electronic cigarettes, and specifically to an electronic cigarette power control circuit based on MOS transistors, which includes an MCU, a first MOS transistor, a second MOS transistor, a battery rod, and an atomizer. The atomizer includes a first electrode and a second electrode, and the two electrodes are respectively connected to both ends of the heating wire. The battery rod includes three electrodes, namely V, C, and G, where the V electrode is the output positive electrode, the G electrode is the output negative electrode, and the C electrode is the detection electrode. The C electrode is connected to the detection pin of the MCU. By detecting the short circuit between the C electrode of the battery rod and the V / G electrode by the MCU, the power size is controlled. The short circuit between the C electrode and the V / G electrode is realized by the positive / negative insertion of the atomizer and the battery rod. This control circuit realizes the control of the output power size through the short circuit of two of the electrodes of the battery rod, which can improve the user experience, and the circuit itself is simple, and the production and manufacturing cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic cigarettes, specifically to an electronic cigarette power control circuit based on MOS transistors and an electronic cigarette. Background Art

[0002] Existing electronic cigarettes only have one output power. For an electronic cigarette with a single output power, when it is powered on and working, the amount of atomized tobacco oil per unit time is fixed. For users who need to quit smoking, it will greatly reduce the success rate of quitting smoking. Most users who want to quit smoking need to rely on reducing the amount of tobacco oil inhaled per day in the early stage to complete quitting. However, for an electronic cigarette with a single output power, since the amount of atomized tobacco oil per unit time cannot be changed, it will reduce the success rate of users quitting smoking. In addition, even for users who do not need to quit smoking, if the user has symptoms such as coughing and sore throat, in order to recover as soon as possible, the amount of tobacco oil smoked per day must be reduced.

[0003] Therefore, an electronic cigarette circuit with adjustable power is designed. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides an electronic cigarette power control circuit based on MOS transistors, which can short-circuit the electrodes through the atomizer and the battery rod, thereby controlling the power of the electronic cigarette.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electronic cigarette power control circuit based on MOS transistors includes an MCU, a first MOS transistor, a second MOS transistor, a battery rod and an atomizer. The atomizer includes a first electrode and a second electrode, and the first electrode and the second electrode are respectively connected to both ends of the heating wire of the atomizer. The battery rod includes an output positive electrode, a detection electrode and an output negative electrode. The detection electrode is short-circuitedly connected to the output positive electrode / output negative electrode through the connection contact of the atomizer. The gates of the first MOS transistor and the second MOS transistor are both connected to the control pins of the MCU.

[0007] Optionally, in an embodiment of the present invention, a voltage-dividing resistor R21 and a voltage-dividing resistor R22 are respectively connected in parallel between the source and the gate of the second MOS transistor and the first MOS transistor.

[0008] Optionally, in an embodiment of the present invention, the source of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R9 is connected in series on the connection line.

[0009] Optionally, in an embodiment of the present invention, the drain of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R8 is connected in series on the connection line.

[0010] Optionally, in an embodiment of the present invention, the atomizer is provided with connection contacts for conducting and connecting two electrodes, and the short - circuit of the two electrodes is realized through the connection contacts.

[0011] Optionally, in an embodiment of the present invention, the detection electrode is connected to the detection pin of the MCU, and a resistor R19 is connected in series on the connection line.

[0012] Optionally, in an embodiment of the present invention, the drain of the second MOS transistor is connected to the output positive electrode.

[0013] Optionally, in an embodiment of the present invention, the drain of the second MOS transistor is connected to the CD pin of the MCU, and a resistor R11 is connected in series on the connection line. A capacitor C3 is connected in parallel between the resistor R11 and the CD pin of the MCU, and the other end of the capacitor C3 is grounded.

[0014] An electronic cigarette includes a control circuit, and the control circuit includes the above - mentioned MOS - transistor - based electronic cigarette power control circuit.

[0015] Advantages of the present invention

[0016] In the MOS - transistor - based electronic cigarette power control circuit of the present invention, the atomizer is provided with connection contacts for short - circuiting. The atomizer is connected to the battery rod, and the detection pin of the battery rod can be short - circuited with the output positive electrode / output negative electrode. Furthermore, the output duty cycle of the MOS transistor is controlled by the MCU to control the power of the electronic cigarette. Brief description of the drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0018] Figure 1 Schematic diagram of the circuit in Embodiment 1 of the present invention;

[0019] Figure 2 Schematic diagram of the positive plug - in connection between the atomizer and the battery rod in Embodiment 1 of the present invention;

[0020] Reference numerals: atomizer 1, first electrode 2, second electrode 3, battery rod 4, output positive electrode 5, detection electrode 6, output negative electrode 7. Detailed description of the specific embodiments

[0021] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in combination with the drawings and preferred embodiments, will describe in detail the specific embodiments, structures, features and their effects of the present invention as follows.

[0022] Embodiment 1

[0023] There is a problem of single power in existing e-cigarettes. Therefore, a power control circuit for e-cigarettes based on MOS transistors is proposed, and the specific solution is as follows:

[0024] As Figure 1-2 shown, a power control circuit for e-cigarettes based on MOS transistors includes an MCU, a first MOS transistor, a second MOS transistor, a battery rod 4 and an atomizer 1. The atomizer 1 includes a first electrode 2 and a second electrode 3. The first electrode 2 and the second electrode 3 are respectively connected to both ends of the heating wire of the atomizer 1. The battery rod 4 includes an output positive electrode 5, a detection electrode 6 and an output negative electrode 7. The detection electrode 6 is short-circuitedly connected to the output positive electrode 5 / output negative electrode 7 through the connection contact of the atomizer 1. The gates of the first MOS transistor and the second MOS transistor are both connected to the control pins of the MCU.

[0025] The circuit of this solution is simple, which can reduce the production cost of e-cigarettes. And because the circuit is simple, the volume of the circuit board is small, which is beneficial to reducing the volume of e-cigarettes.

[0026] Among them, the heating wire is used to atomize the e-liquid; the first electrode 2 and the second electrode 3 play a role in conducting electricity and input the voltage of the battery rod 4 to the heating wire.

[0027] In this embodiment, the first MOS transistor uses a CJK1219MOS transistor, and the second MOS transistor uses a CJE3139K MOS transistor.

[0028] In this embodiment, the first MOS transistor and the second MOS transistor are equivalent to an electronic switch controlled by PWM. By changing the duty cycle, the length of the output current time is changed, that is, the proportion of the MOS transistor conduction in unit time, so as to change the average current size, and further change the power size of the heating wire.

[0029] As Figure 1 shown, specifically, the gate of the first MOS transistor is connected to the HEATER_EN pin of the MCU, and a resistor R23 is connected in series on the connection line. The gate of the second MOS transistor is connected to the HEATER_CH pin of the MCU. In this embodiment, the resistance value of the resistor R23 is 100R.

[0030] The MCU controls the conduction of the two MOS transistors through two control pins respectively.

[0031] As Figure 1 shown, voltage-dividing resistors R21 and R22 are respectively connected in parallel between the source and the gate of the second MOS transistor and the first MOS transistor. Specifically, the voltage-dividing resistor R21 is connected in parallel between the source and the gate of the second MOS transistor, and the voltage-dividing resistor R22 is connected in parallel between the source and the gate of the first MOS transistor. In this embodiment, the resistance values of the voltage-dividing resistors R21 and R22 are both 10K.

[0032] The input resistance of the MOS transistor is relatively high, and the capacitance between the gate and the source is relatively small. Therefore, it is very easy to be charged by external or static electricity, which is likely to cause electrostatic breakdown. The setting of resistors R21 and R22 plays a current-limiting role to prevent the first MOS transistor and the second MOS transistor from being burned out due to excessive current.

[0033] The source of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R9 is connected in series on the connection line. The sources of the first MOS transistor and the second MOS transistor are both connected to the battery positive terminal BAT+ of the MCU.

[0034] The drain of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R8 is connected in series on the connection line. The resistor R8 is used to divide the voltage of the second MOS transistor. In this embodiment, the resistance value of the resistor R8 is 18R.

[0035] The setting of the resistor R8 is used to provide a voltage signal for the MCU to feedback and control the on-state of the MOS transistor.

[0036] The drain of the first MOS transistor is connected to the output positive terminal 5.

[0037] The drain of the first MOS transistor is connected to the CD pin of the MCU, and a resistor R11 is connected in series on the connection line. A capacitor C3 is connected in parallel between the resistor R11 and the CD pin of the MCU. The other end of the capacitor C3 is grounded. The capacitor C3 functions as a filter capacitor. In this embodiment, the capacitance of the capacitor C3 is 10 nF.

[0038] The detection electrode 6 is connected to the detection pin of the MCU, and a resistor R19 is connected in series on the connection line. In this embodiment, the resistance value of the resistor R19 is 1K. The resistor R19 plays a voltage-drop role to reduce the voltage input to the chip and protect the chip.

[0039] As Figure 2 shown, the atomizer 1 is provided with connection contacts that can conductively connect two electrodes. The short circuit of the two electrodes is realized through the connection contacts. The positive and negative pluggings of the atomizer 1 and the battery rod 4 realize the short circuit of two different electrodes.

[0040] An electronic cigarette is disclosed in an embodiment, which includes a control circuit, and the control circuit includes the above-mentioned electronic cigarette power control circuit based on MOS transistors.

[0041] Working principle:

[0042] The MCU detects the short circuit between the detection electrode 6 of the battery rod 4 and the output positive terminal 5 / output negative terminal 7 of the battery rod 4 to distinguish and control the output power size.

[0043] As Figure 1As shown, the atomizer 1 is inserted into the battery rod 4 in the forward direction. The detection electrode 6 is short-circuited with the G electrode through the second electrode 3. Since the output negative electrode 7 is grounded, the voltage of the output negative electrode 7 is 0V. When the atomizer 1 is inserted instantaneously or when smoking is started, at this time, the detection electrode 6 is at a low level. The MCU detects that the voltage of the detection electrode 6 is 0V, then determines that the detection electrode 6 is short-circuited with the output negative electrode 7. The MCU controls the output duty cycle of the first MOS transistor Q6 to control the output power to be in the high / low power mode, thereby realizing increasing / decreasing the amount of atomized tobacco oil per unit time of the electronic cigarette.

[0044] The atomizer 1 is inserted into the battery rod 4 in the reverse direction. The detection electrode 6 is short-circuited with the output positive electrode 5 through the second electrode 3. When the atomizer 1 is inserted instantaneously or when smoking is started, the MCU immediately gives a signal to the HEATER_CH pin to turn on the second MOS transistor Q7. The voltage passes through the second MOS transistor Q7 to the voltage-dividing resistor R8 and then to the output positive electrode 5, through the heating wire to the output negative electrode 7 and is grounded. The voltage of the output positive electrode 5 is equal to the voltage division of the voltage-dividing resistor R8 and the heating wire. At this time, the MCU detects that the voltage of the detection electrode 6 is equal to the voltage of the output positive electrode 5, then determines that the detection electrode 6 is short-circuited with the output positive electrode 5. The MCU controls the output duty cycle of Q6 to control the output power to be in the low / high power mode.

[0045] The electronic cigarette of this solution realizes the conversion of high and low powers through the forward and reverse pluggings of the atomizer 1 and the battery rod 4, and then controls the amount of atomized tobacco oil per unit time, so as to assist smoking cessation users in quitting smoking and reduce the amount of tobacco oil inhaled.

[0046] The above is only a preferred embodiment of the present invention, and it is not intended to limit the present invention in any form. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to make equivalent embodiments of equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An electronic cigarette power control circuit based on MOS transistors, characterized in that: It includes an MCU, a first MOS transistor, a second MOS transistor, a battery rod and an atomizer. The atomizer includes a first electrode and a second electrode, and the first electrode and the second electrode are respectively connected to both ends of the heating wire of the atomizer. The battery rod includes an output positive electrode, a detection electrode and an output negative electrode. The detection electrode is short-circuited to the output positive electrode / output negative electrode through the connection contact of the atomizer. The gates of the first MOS transistor and the second MOS transistor are both connected to the control pins of the MCU; voltage-dividing resistors are respectively connected in parallel between the source and the gate of the second MOS transistor and the first MOS transistor; the source of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R9 is connected in series on the connection line; the drain of the second MOS transistor is connected to the drain of the first MOS transistor, and a resistor R8 is connected in series on the connection line; the atomizer is provided with a connection contact for conductively connecting the two electrodes; the detection electrode is connected to the detection pin of the MCU, and a resistor R19 is connected in series on the connection line; the drain of the second MOS transistor is connected to the output positive electrode; the drain of the second MOS transistor is connected to the CD pin of the MCU, and a resistor R11 is connected in series on the connection line.

2. An electronic cigarette, comprising a control circuit, characterized in that: The control circuit includes the MOS transistor-based electronic cigarette power control circuit according to claim 1.

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