A control circuit for electronic atomizer and electronic atomizer

Abstract

The invention discloses a control circuit of an electronic atomizer and the electronic atomizer. The control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd. The control circuit includes a control logic module, a power supply module, a clamping element, a resistor and a PMOS power tube. The first end of the control logic module is connected to the first end of the power supply module, the second end of the power supply module, the first end of the clamping element and the source of the PMOS power tube are connected to the pin CELL, the second end of the control logic module and the second end of the clamping element are connected to the gate of the PMOS power tube, the drain of the PMOS power tube is connected to the pin Vout, the resistor is connected in series between the third end of the control logic module and the pin Gnd, the two ends of the heating wire are connected to the pin Vout and the pin Gnd respectively, the battery of the electronic atomizer is connected between the pin CELL and the pin Gnd, and when the battery of the electronic atomizer is reversely connected, the current is allowed to flow through the PMOS power tube, thereby avoiding the current from being out of control and damaging the control chip, and improving the safety of the electronic atomizer.

Description

Technical Field

[0001] The present application relates to the technical field of electronic atomizers, and more specifically, to a control circuit of an electronic atomizer and an electronic atomizer. Background Art

[0002] An electronic atomizer is an electronic product that imitates cigarettes. It produces smoke for inhalation by atomizing the smoke liquid through a heated wire. It can meet the smokers' needs for different concentrations of smoke oil and a variety of flavors. Therefore, it is widely loved by smokers. There are currently a large number of mainstream products on the market.

[0003] In actual applications, the positive and negative poles of the battery are often connected reversely when assembling electronic atomizer products. Once the positive and negative poles of the battery are connected reversely, the control chip is equivalent to an equivalent diode that short-circuits the battery, and the control chip cannot control the current flowing through it, which can easily cause the control chip to "burn" directly, and may cause "explosion" due to excessive current, causing serious safety hazards.

[0004] Therefore, how to provide a control circuit that can improve the safety of the electronic atomizer is a technical problem that needs to be solved. Summary of the invention

[0005] The invention discloses a control circuit of an electronic atomizer, which is used to solve the technical problem of low safety of the electronic atomizer caused by reverse connection of batteries in the prior art.

[0006] The control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd. The control circuit includes a control logic module, a power supply module, a clamping element, a resistor and a PMOS power tube, wherein:

[0007] The control logic module is used to generate a control signal for the electronic atomizer according to a preset control logic, and the power supply module is used to supply power to the control logic module. The first end of the control logic module is connected to the first end of the power supply module, the second end of the power supply module, the first end of the clamping element and the source of the PMOS power tube are connected to the pin CELL, the second end of the control logic module and the second end of the clamping element are connected to the gate of the PMOS power tube, the drain of the PMOS power tube is connected to the pin Vout, the resistor is connected in series between the third end of the control logic module and the pin Gnd, the two ends of the heating wire of the electronic atomizer are respectively connected to the pin Vout and the pin Gnd, and the battery of the electronic atomizer is connected between the pin CELL and the pin Gnd;

[0008] When the positive electrode of the battery is connected to the pin Gnd and the negative electrode of the battery is connected to the pin CELL, the clamping element clamps a PN junction voltage drop between the gate of the PMOS power tube and the pin CELL.

[0009] In some embodiments of the present application, the control chip further includes a pin SENSOR, the pin SENSOR is connected to the fourth end of the control logic module, the control circuit further includes a first ESD device, a second ESD device, a first protection element and a second protection element, the first end of the first protection element is connected to the second end of the power supply module, the first ESD device is connected in series between the second end of the first protection element and the first end of the second protection element, the second ESD device is connected in series between the second end of the second protection element and the third end of the control logic module, and the first ends of the first ESD device and the second protection element are connected to the pin SENSOR;

[0010] The pin SENSOR is used to enable the control logic module to detect whether there is a smoke inhalation action, the first protection element is used to prevent current from flowing back to the first ESD device, and the second protection element is used to prevent current from flowing back to the second ESD device.

[0011] In some embodiments of the present application, the structures of the first ESD device and the second ESD device include a diode structure, a GGNMOS structure, or a PNP structure.

[0012] In some embodiments of the present application, the control chip further includes:

[0013] A pin USB, connected to the control logic module, for enabling the control logic module to manage charging of the battery;

[0014] The pin LED is connected to the control logic module and is used to enable the control logic module to control the LED of the electronic atomizer.

[0015] In some embodiments of the present application, the impedance of the heating wire is smaller than the impedance of the resistor.

[0016] Correspondingly, the present invention also proposes an electronic atomizer, comprising the control circuit as described above.

[0017] By applying the above technical solution, the control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd, and the control circuit includes a control logic module, a power supply module, a clamping element, a resistor and a PMOS power tube, wherein the control logic module is used to generate a control signal for the electronic atomizer according to a preset control logic, the power supply module is used to power the control logic module, a first end of the control logic module is connected to a first end of the power supply module, a second end of the power supply module, a first end of the clamping element and a source of the PMOS power tube are connected to the pin CELL, a second end of the control logic module and a second end of the clamping element are connected to a gate of the PMOS power tube, a drain of the PMOS power tube is connected to the pin Vout, a resistor is connected in series between a third end of the control logic module and the pin Gnd, two ends of the heating wire are connected to the pin Vout and the pin Gnd respectively, a battery of the electronic atomizer is connected between the pin CELL and the pin Gnd, and when the battery of the electronic atomizer is reversely connected, current is allowed to flow through the PMOS power tube, thereby avoiding current runaway and damaging the control chip, and improving the safety of the electronic atomizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram showing the structure of a control circuit of an electronic atomizer provided by an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of a current path when the battery is connected reversely and the PMOS power tube is not turned on in an embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of a current path when the battery is connected reversely and the PMOS power tube is turned on in an embodiment of the present invention is shown;

[0022] Figure 4 A schematic structural diagram of a control circuit of an electronic atomizer proposed in another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0025] The present application embodiment provides a control circuit of an electronic atomizer, such as Figure 1 As shown, the control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd. The control circuit includes a control logic module, a power supply module power, a clamping element Vz, a resistor R1 and a PMOS power tube (ie, a P-type power tube) M1, wherein:

[0026] The control logic module is used to generate a control signal for the electronic atomizer according to a preset control logic, and the power supply module power is used to power the control logic module. The first end of the control logic module (i.e., the Vdd end) is connected to the first end of the power supply module power, and the second end of the power supply module power, the first end of the clamping element Vz and the source of the PMOS power tube M1 are connected to the pin CELL. The second end of the control logic module and the second end of the clamping element Vz are connected to the gate of the PMOS power tube M1, and the drain of the PMOS power tube M1 is connected to the pin Vout. The resistor R1 is connected in series between the third end of the control logic module and the pin Gnd, and the two ends of the heating wire of the electronic atomizer are respectively connected to the pin Vout and the pin Gnd, and the battery of the electronic atomizer is connected between the pin CELL and the pin Gnd.

[0027] In this embodiment, when the battery is connected in the forward direction, that is, when the positive electrode of the battery is connected to the pin CELL and the negative electrode of the battery is connected to the pin Gnd, the clamping element Vz is cut off; when the battery is connected in the reverse direction, that is, when the positive electrode of the battery is connected to the pin Gnd and the negative electrode of the battery is connected to the pin CELL, all devices inside the control chip are equivalent to generating diodes, such as Figure 2 As shown in "Path 1" in the figure, the current flows through the resistor R1, the equivalent parasitic diode V0 of the control chip and the CELL pin in turn.

[0028] When the battery is reversed, the battery voltage drop includes the voltage drop V on the equivalent parasitic diode V0. PN and the voltage drop across resistor R1, the voltage drop across resistor R1 is Vdd-V PN The clamping element Vz clamps a PN junction voltage drop between the gate of the PMOS power tube M1 and the pin CELL. When the reverse current makes the voltage drop I*R1 on the resistor R1 greater than the threshold voltage Vth of the PMOS power tube M1, the PMOS power tube M1 will turn on. Figure 3As shown in "Path 2" in the figure, most of the battery current is conducted along the pin Gnd - heating wire - PMOS power tube M1 - pin CELL. At this time, the internal logic circuit of the control chip will not be damaged. At the same time, since the size of the PMOS power tube M1 itself is large enough, the PMOS power tube M1 will not burn out. In addition, due to the impedance of the heating wire and the PMOS power tube M1, the current will not be out of control, so the control chip will not burn out.

[0029] Optional, such as Figure 1 As shown, the clamping element Vz is a voltage-stabilizing diode, the first end of the clamping element Vz is the cathode of the voltage-stabilizing diode, and the second end of the clamping element Vz is the anode of the voltage-stabilizing diode. Those skilled in the art may select other types of clamping elements according to actual needs, which does not affect the protection scope of this application.

[0030] Optionally, the above PN junction voltage drop is about 0.6V.

[0031] In order to further improve the safety of the electronic atomizer, in some embodiments of the present application, such as Figure 4 As shown, the control chip also includes a pin SENSOR, which is connected to the fourth end of the control logic module. The control circuit also includes a first ESD (Electro-Static discharge) device ESD1, a second ESD device ESD2, a first protection element V1 and a second protection element V2. The first end of the first protection element V1 is connected to the second end of the power supply module power, the first ESD device ESD1 is connected in series between the second end of the first protection element V1 and the first end of the second protection element V2, the second ESD device ESD2 is connected in series between the second end of the second protection element V2 and the third end of the control logic module, and the first ends of the first ESD device ESD1 and the second protection element V2 are connected to the pin SENSOR.

[0032] In this embodiment, the first protection element V1 is used to prevent the current from flowing back to the first ESD device ESD1, and the second protection element V2 is used to prevent the current from flowing back to the second ESD device ESD2. When the battery is positively connected and the first ESD device ESD1 and the second ESD device ESD2 are triggered, the first protection element V1 and the second protection element V2 are turned on; when the battery is reversely connected, the pin Gnd is connected to a high potential, at which time the first protection element V1 and the second protection element V2 are turned off, causing the first ESD device ESD1 and the second ESD device ESD2 to be turned off, thereby avoiding damage to the first ESD device ESD1 and the second ESD device ESD2 due to the flow of large current.

[0033] Optional, such as Figure 4As shown, the first protection element V1 and the second protection element V2 are in the form of diodes, the first end of the first protection element V1 is the anode of the diode, the second end of the first protection element V1 is the cathode of the diode, the first end of the second protection element V2 is the anode of the diode, and the first end of the second protection element V2 is the cathode of the diode. Those skilled in the art may also select other forms of protection elements that can prevent ESD current from flowing back, and the first protection element V1 and the second protection element V2 may use the same form of protection elements, or different forms of protection elements, which does not affect the protection scope of the present application.

[0034] The pin SENSOR is connected to a sensor for detecting sound or airflow. The sensor sends a signal to the control logic module through the pin SENSOR, so that the control logic module detects whether there is a smoke inhalation action.

[0035] It should be noted that the first ends of the first ESD device ESD1 and the second protection element V2 can also be connected to other Pad (wire bonding pads packaged inside the control chip) pins of the control chip (except pin CELL and pin Gnd), which does not affect the protection scope of this application.

[0036] In order to improve the flexibility of the control circuit, in some embodiments of the present application, the structure of the first ESD device ESD1 and the second ESD device ESD2 includes a diode structure, or a GGNMOS (gate-grounded NMOS) structure, or a PNP structure.

[0037] Although Figure 4 The structures of the first ESD device ESD1 and the second ESD device ESD2 are diode structures, and those skilled in the art may also adopt other structures including GGNMOS structure or PNP structure.

[0038] In order to ensure the reliability of the electronic atomizer, in some embodiments of the present application, the control chip further includes:

[0039] The pin USB is connected to the control logic module and is used to enable the control logic module to manage the battery charging;

[0040] The pin LED is connected to the control logic module and is used to enable the control logic module to control the LED of the electronic atomizer.

[0041] Those skilled in the art may set other types of pins on the control chip according to actual needs, which does not affect the protection scope of the present application.

[0042] In order to further improve the safety of the electronic atomizer, in some embodiments of the present application, the impedance of the heating wire is smaller than the impedance of the resistor R1.

[0043] In this embodiment, since the current I=V / R, the impedance of the heating wire is smaller than the impedance of the resistor R1. When the battery is connected reversely, the reverse current is mainly conducted through the heating wire, preventing excessive current from entering the control chip through the resistor R1, thereby avoiding burning the chip.

[0044] In order to further improve the safety of the electronic atomizer, in some embodiments of the present application, the impedance of the heating wire is 1Ω, and the impedance of the resistor R1 is 100Ω, or other values.

[0045] By applying the above technical solution, the control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd, and the control circuit includes a control logic module, a power supply module, a clamping element, a resistor and a PMOS power tube, wherein the control logic module is used to generate a control signal for the electronic atomizer according to a preset control logic, the power supply module is used to power the control logic module, a first end of the control logic module is connected to a first end of the power supply module, a second end of the power supply module, a first end of the clamping element and a source of the PMOS power tube are connected to the pin CELL, a second end of the control logic module and a second end of the clamping element are connected to a gate of the PMOS power tube, a drain of the PMOS power tube is connected to the pin Vout, a resistor is connected in series between a third end of the control logic module and the pin Gnd, two ends of the heating wire are connected to the pin Vout and the pin Gnd respectively, a battery of the electronic atomizer is connected between the pin CELL and the pin Gnd, and when the battery of the electronic atomizer is reversely connected, current is allowed to flow through the PMOS power tube, thereby avoiding current runaway and damaging the control chip, and improving the safety of the electronic atomizer.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control circuit for an electronic atomizer, characterized in that: The control circuit is integrated on a control chip including a pin CELL, a pin Vout and a pin Gnd. The control circuit includes a control logic module, a power supply module, a clamping element, a resistor and a PMOS power tube, wherein: The control logic module is used to generate a control signal for the electronic atomizer according to a preset control logic, and the power supply module is used to supply power to the control logic module. The first end of the control logic module is connected to the first end of the power supply module, the second end of the power supply module, the first end of the clamping element and the source of the PMOS power tube are connected to the pin CELL, the second end of the control logic module and the second end of the clamping element are connected to the gate of the PMOS power tube, the drain of the PMOS power tube is connected to the pin Vout, the resistor is connected in series between the third end of the control logic module and the pin Gnd, the two ends of the heating wire of the electronic atomizer are respectively connected to the pin Vout and the pin Gnd, and the battery of the electronic atomizer is connected between the pin CELL and the pin Gnd; When the positive electrode of the battery is connected to the pin Gnd and the negative electrode of the battery is connected to the pin CELL, the clamping element clamps a PN junction voltage drop between the gate of the PMOS power tube and the pin CELL.

2. The control circuit according to claim 1, characterized in that: The control chip further includes a pin SENSOR, and the pin SENSOR is connected to the fourth end of the control logic module. The control circuit further includes a first ESD device, a second ESD device, a first protection element, and a second protection element. The first end of the first protection element is connected to the second end of the power supply module, the first ESD device is connected in series between the second end of the first protection element and the first end of the second protection element, the second ESD device is connected in series between the second end of the second protection element and the third end of the control logic module, and the first ends of the first ESD device and the second protection element are connected to the pin SENSOR; The pin SENSOR is used to enable the control logic module to detect whether there is a smoke inhalation action, the first protection element is used to prevent current from flowing back to the first ESD device, and the second protection element is used to prevent current from flowing back to the second ESD device.

3. The control circuit according to claim 2, characterized in that: The structures of the first ESD device and the second ESD device include a diode structure, a GGNMOS structure, or a PNP structure.

4. The control circuit according to claim 1, characterized in that: The control chip also includes: A pin USB, connected to the control logic module, for enabling the control logic module to manage charging of the battery; The pin LED is connected to the control logic module and is used to enable the control logic module to control the LED of the electronic atomizer.

5. The control circuit according to claim 1, characterized in that: The impedance of the heating wire is smaller than the impedance of the resistor.

6. An electronic atomizer, characterized in that: Comprising the control circuit as described in any one of claims 1-5.

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