Low-power-consumption anti-backflow power supply circuit and electronic cigarette

Abstract

The invention provides a low-power-consumption anti-backflow power supply circuit and an electronic cigarette, in the low-power-consumption anti-backflow power supply circuit, an internal power supply anti-backflow module is disconnected when a control end detects a working signal of an external power supply, and is used for preventing the internal power supply from backflow; the external power supply anti-backflow module is disconnected when the control end detects the working signal of the internal power supply and is used for preventing the external power supply from backflow; the control module is used for outputting an atomization driving signal to the atomization driving module, outputting an external power supply working signal to the internal power supply anti-backflow module when the external power supply is connected, and outputting an internal power supply working signal to the external power supply anti-backflow module when the internal power supply is connected; the atomization driving module is connected with the atomization device and drives the atomization device to heat according to the atomization driving signal. Only one power supply anti-backflow module works during power supply, so that the power supply voltage can also realize the anti-backflow function of the internal and external power supplies only by passing through one switching tube at the same time, the power loss of the switching tube is reduced, and the cruising ability of the circuit is improved.

Description

Technical Field

[0001] This invention relates to the field of anti-backflow circuit technology, and more particularly to a low-power anti-backflow power supply circuit and an electronic cigarette. Background Technology

[0002] With the development of mobile electronic devices, existing portable electronic devices can be compatible with both battery power and external power supply. In fact, when using rechargeable batteries, the external power supply can charge the batteries at the same time, thereby improving the battery life of mobile electronic devices.

[0003] In practical use, since the power supply circuits of the external power supply and the internal power supply are connected to the power device at the same time, when one of them is supplying power, the charging voltage will flow back into the other power supply circuit. For this reason, the existing backflow circuit often uses a dual-switch transistor circuit to prevent backflow. In implementation, the power supply voltage needs to pass through at least two switching transistor structures, so that the circuit operation includes at least the power loss of the dual switching transistors. As a result, the additional battery power loss shortens the battery life of the power device under the same battery capacity.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a low-power anti-backflow power supply circuit and an electronic cigarette to solve the problems of high power loss of the switching transistor and short circuit life of the existing anti-backflow circuit.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a low-power anti-backflow power supply circuit, comprising: an internal power supply anti-backflow module, an external power supply anti-backflow module, an atomization drive module, and a control module; wherein... The power supply terminal of the internal power supply anti-backflow module is connected to the positive terminal of the internal power supply and is also connected to the control module and the atomization drive module. The control terminal of the internal power supply anti-backflow module is connected to the internal power supply control terminal of the control module. The first switch connection terminal of the internal power supply anti-backflow module is grounded, and the second switch connection terminal of the internal power supply anti-backflow module is connected to the negative terminal of the internal power supply. The first and second switch connection terminals of the internal power supply anti-backflow module are disconnected when the control terminal detects an external power supply working signal to prevent the internal power supply from being backflowed. The first switch connection terminal of the external power supply anti-backflow module is connected to an external power supply, and the second switch connection terminal of the external power supply anti-backflow module is connected to the control module and the atomization drive module respectively. The control terminal of the external power supply anti-backflow module is connected to the external power supply control terminal of the control module. The first and second switch connection terminals of the external power supply anti-backflow module are disconnected when the control terminal detects the internal power supply working signal to prevent the external power supply from being backflowed. The atomization control terminal of the control module is connected to the control terminal of the atomization drive module. It is used to detect the access status of the internal power supply and the external power supply and output the atomization drive signal to the atomization drive module. When the external power supply is connected, it outputs the external power supply working signal to the internal power supply anti-backflow module. When the internal power supply is connected, it outputs the internal power supply working signal to the external power supply anti-backflow module. The atomization drive module is connected to the atomization device and is used to drive the atomization device to heat up according to the atomization drive signal.

[0007] In a further embodiment of the present invention, the internal power supply backflow prevention module includes a first resistor, a third resistor, and a second field-effect transistor, wherein, One end of the first resistor is connected to the positive terminal of the internal power supply, the other end of the first resistor is connected to one end of the third resistor, the other end of the third resistor is connected to the gate of the second field-effect transistor, the source of the second field-effect transistor is grounded, and the drain of the second field-effect transistor is connected to the negative terminal of the internal power supply; the common terminal of the first resistor and the third resistor is connected to the internal power supply control terminal of the control module.

[0008] In a further embodiment of the present invention, the control module includes a power detection unit and a microcontroller unit, wherein, The external power supply terminal of the power detection unit is connected to the external power supply anti-backflow module, the internal power supply terminal of the power detection unit is connected to the positive terminal of the internal power supply, and the power output terminal of the power detection unit is connected to the power supply terminal of the microcontroller unit; the internal power supply detection terminal of the power detection unit is connected to the internal access detection terminal of the microcontroller unit, and the external power supply detection terminal of the power detection unit is connected to the external access detection terminal of the microcontroller unit; the power detection unit is used to detect the access status of the internal and external power supplies, and outputs a working voltage to the microcontroller unit according to the internal or external power supply; the power detection unit outputs an external power supply on signal to the microcontroller unit when the external power supply is connected, and outputs an internal power supply on signal to the microcontroller unit when the internal power supply is connected; The microcontroller calculates the external power supply voltage based on the external power supply connection signal and calculates the internal power supply voltage based on the internal power supply connection signal.

[0009] In a further embodiment of the present invention, the power supply detection unit includes: an eighth resistor, an eleventh resistor, a fifteenth resistor, a seventeenth resistor, a third capacitor, a fourth capacitor, a first diode, and a second diode; wherein, One end of the eleventh resistor is connected to the external power supply anti-backflow module, and the other end of the eleventh resistor is connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded; one end of the third capacitor is connected to the common terminal of the eighth and eleventh resistors, and the other end of the third capacitor is grounded; the common terminal of the eighth, eleventh, and third resistors is connected to the external access detection terminal of the microcontroller unit. One end of the fifteenth resistor is connected to the positive terminal of the internal power supply, and the other end of the fifteenth resistor is connected to one end of the seventeenth resistor, the other end of the seventeenth resistor is grounded; one end of the fourth capacitor is connected to the common terminal of the fifteenth resistor and the seventeenth resistor, and the other end of the fourth capacitor is grounded; the common terminal of the fifteenth resistor, the seventeenth resistor and the fourth capacitor is connected to the internal access detection terminal of the microcontroller unit. The anode of the first diode is connected to the common terminal of the external power supply anti-backflow module and the eleventh resistor; the anode of the second diode is connected to the common terminal of the internal power supply anti-backflow module and the fifteenth resistor; and the cathodes of the first diode and the second diode are respectively connected to the power supply terminal of the microcontroller unit.

[0010] In a further embodiment of the present invention, the external power supply backflow prevention module includes: a third field-effect transistor, a ninth resistor, and a thirteenth resistor, wherein, The gate of the third field-effect transistor is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is grounded; the common terminal of the ninth and thirteenth resistors is connected to the external power supply control terminal of the control module; the source of the third field-effect transistor is used to output the external power supply voltage.

[0011] In a further embodiment of the present invention, the atomization driving module includes at least one atomizer driving unit. The first power input terminal of the atomizer is connected to an external power source through the external power anti-backflow module. The second power input terminal of the atomizer driving unit is connected to the positive terminal of the internal power source. The first control terminal of the atomizer driving unit is connected to the first atomization control terminal of the control module, and the second control terminal of the atomizer driving unit is connected to the second atomization control terminal of the control module. The atomizer control terminal of the atomizer driving unit is connected to the positive terminal of the atomizer, and the negative terminal of the atomizer is grounded. When the atomizer driving unit is connected to an external power source, it controls the working state of the atomizer through the first atomization control terminal. When the atomizer driving unit is connected to an internal power source, it controls the working state of the atomizer through the second atomization control terminal.

[0012] In a further embodiment of the present invention, the atomizer driving unit includes: a first field-effect transistor, a fourth field-effect transistor, a fourth resistor, a seventh resistor, a tenth resistor, a twelfth resistor, and a fourteenth resistor; wherein, The source of the first field-effect transistor is connected to the external power supply through the external power supply anti-backflow module; the gate of the first field-effect transistor is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the first atomization control terminal of the control module; one end of the fourth resistor is connected to the source of the first field-effect transistor; the other end of the fourth resistor is connected to the gate of the first field-effect transistor; and the drain of the first field-effect transistor is connected to the positive terminal of the atomizer. The source of the fourth field-effect transistor is connected to the internal power supply through the internal power supply anti-backflow module. The gate of the fourth field-effect transistor is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the second atomization control terminal of the control module. One end of the tenth resistor is connected to the source of the fourth field-effect transistor, and the other end of the tenth resistor is connected to the gate of the fourth field-effect transistor. The drain of the fourth field-effect transistor is connected to the positive terminal of the atomizer. One end of the fourteenth resistor is connected to the positive terminal of the atomizer, and the other end of the fourteenth resistor is connected to the internal power supply detection terminal of the control module for internal power supply voltage detection.

[0013] In a further embodiment of the present invention, the atomization driving module includes a first atomizer driving unit and a second atomizer driving unit, wherein the first atomizer driving unit is used to drive the first atomizer, the second atomizer driving unit is used to drive the second atomizer, and the first atomizer and the second atomizer are grounded together.

[0014] In a further embodiment of the present invention, the microcontroller unit includes a microcontroller chip, the model of which is SC8F073AD720NPR.

[0015] Secondly, the present invention also provides an electronic cigarette, the electronic cigarette including the low-power anti-backflow power supply circuit described above.

[0016] This invention provides a low-power anti-backflow power supply circuit and an electronic cigarette. The low-power anti-backflow power supply circuit includes an internal power supply anti-backflow module, an external power supply anti-backflow module, an atomization drive module, and a control module. The power supply terminal of the internal power supply anti-backflow module is connected to the positive terminal of the internal power supply and is also connected to the control module and the atomization drive module. The control terminal of the internal power supply anti-backflow module is connected to the internal power supply control terminal of the control module. The first switch connection terminal of the internal power supply anti-backflow module is grounded, and the second switch connection terminal is connected to the negative terminal of the internal power supply. The first and second switch connection terminals of the internal power supply anti-backflow module disconnect when the control terminal detects an external power supply operating signal to prevent backflow into the internal power supply. The first switch connection terminal of the external power supply anti-backflow module is connected to an external power supply. The second switch connection terminal of the module is connected to the control module and the atomization drive module respectively. The control terminal of the external power supply backflow prevention module is connected to the external power supply control terminal of the control module. The first and second switch connection terminals of the external power supply backflow prevention module are disconnected when the control terminal detects the internal power supply working signal to prevent the external power supply from being backflowed. The atomization control terminal of the control module is connected to the control terminal of the atomization drive module to detect the connection status of the internal and external power supplies and output an atomization drive signal to the atomization drive module. When the external power supply is connected, it outputs an external power supply working signal to the internal power supply backflow prevention module, and when the internal power supply is connected, it outputs an internal power supply working signal to the external power supply backflow prevention module. The atomization drive module is connected to the atomization device and drives the atomization device to heat according to the atomization drive signal. In this invention, by having only one power supply backflow prevention module working during power supply, the power supply voltage only needs to pass through one switching transistor at the same time to achieve the backflow prevention function of the internal and external power supplies, reducing the power loss of the switching transistor and improving the circuit's endurance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the low-power anti-backflow power supply circuit in this invention.

[0019] Figure 2 This is a circuit diagram of an anti-backflow circuit in existing technology.

[0020] Figure 3 This is a circuit diagram of the internal power supply anti-backflow module in this invention.

[0021] Figure 4 This is the circuit diagram of the external power supply backflow prevention module in this invention.

[0022] Figure 5 This is a circuit diagram of the atomization driving module in this invention.

[0023] Figure 6 This is the circuit schematic diagram of the control module in this invention.

[0024] The following labels in the attached diagram represent the following: 100, internal power supply backflow prevention module; 200, external power supply backflow prevention module; 300, atomization drive module; 310, first atomizer drive unit; 320, second atomizer drive unit; 400, control module; 410, power detection unit; 420, microcontroller unit. Detailed Implementation

[0025] This invention provides a low-power anti-backflow power supply circuit and an electronic cigarette. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0027] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0028] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0029] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] The inventors discovered that current conventional products use an internal power supply, charging the battery via an external power bank. The internal power supply then powers the heating wire atomizing plate. If the internal power supply is insufficient, an external battery is needed to power the heating wire while still charging. This requires two switching transistors for isolation to prevent backflow. This results in three stages of switching transistors at the heating wire, leading to significant battery power loss and short battery life at the same normal output power.

[0031] For example, such as Figure 2As shown, the switching transistor structure takes a MOSFET as an example. The existing power supply circuit with anti-backflow function achieves anti-backflow through two MOSFETs connected in series. The 5V pad is connected to the boost output of the charging case host at 5V. The DATA pad is connected to the data port of the charging case host at 5V. The GND pad is connected to the ground of the charging case host at 5V. The MB+ pad is connected to the positive terminal of the external power supply. The B+1 pad is connected to the positive terminal of the internal power supply. The B-1 pad is connected to the negative terminal of the internal power supply. M_B+ and B+ are selected by connecting the third power switch Q3' to the second power switch Q2', and the sixth power switch Q6' to the fifth power switch Q5'. POWM_POWER4 controls the third power switch Q3' and the second power switch Q2', while POWM_POWER1 controls the on / off state of the sixth power switch Q6' and the fifth power switch Q5'. The drains of the third power switch Q3' and the second power switch Q2' are connected to each other, and their gates are connected to POWM_POWER1. Similarly, the drains of the sixth power switch Q6' and the fifth power switch Q5' are connected to each other, and their gates are connected to POWM_POWER4. Controlling both together prevents reverse current through the body diodes. Specifically, the third power switch Q3' and the second power switch Q2' are positioned opposite each other, and the sixth power switch Q6' and the fifth power switch Q5' are positioned opposite each other, so that their internal body diodes are also in reverse series. In this way, regardless of the direction of the voltage, one body diode is always reverse-biased, thus blocking the leakage current path through the body diode and achieving backflow prevention. The first power consumption switch Q1' and the fourth power consumption switch Q4' control the output power and time of the heating wire in the first atomizer and the output power and time of the heating wire in the second atomizer, respectively. It can be seen that in the prior art, each output path from the battery to the heating wire of the atomizer requires passing through 3 MOSFETs, resulting in additional switching power loss.

[0032] Firstly, please refer to Figure 1This invention provides a low-power anti-backflow power supply circuit, comprising: an internal power supply anti-backflow module 100, an external power supply anti-backflow module 200, an atomization drive module 300, and a control module 400; wherein, the power supply terminal of the internal power supply anti-backflow module 100 is connected to the positive terminal B+1 of the internal power supply, and is also connected to the control module 400 and the atomization drive module 300; the control terminal of the internal power supply anti-backflow module 100 is connected to the internal power supply control terminal CON_BAT of the control module 400; the first switch connection terminal of the internal power supply anti-backflow module 100 is grounded, and the second switch connection terminal of the internal power supply anti-backflow module 100 is connected to the negative terminal B-1 of the internal power supply; the first and second switch connection terminals of the internal power supply anti-backflow module 100 are disconnected when the control terminal detects an external power supply operating signal, to prevent backflow of the internal power supply; the first switch connection terminal of the external power supply anti-backflow module 200 is connected to an external power supply, and the external power supply anti-backflow module 200... The second switch connection terminal of the 00 module is connected to the control module 400 and the atomization drive module 300 respectively. The control terminal of the external power supply backflow prevention module 200 is connected to the external power supply control terminal CON_MBAT of the control module 400. The first and second switch connection terminals of the external power supply backflow prevention module 200 are disconnected when the control terminal detects the internal power supply working signal to prevent the external power supply from being backflowed. The atomization control terminal of the control module 400 is connected to the control terminal of the atomization drive module 300 to detect the access status of the internal and external power supplies and output an atomization drive signal to the atomization drive module 300. When the external power supply is connected, it outputs an external power supply working signal to the internal power supply backflow prevention module 100 and an internal power supply working signal to the external power supply backflow prevention module 200. The atomization drive module 300 is connected to the atomization device and is used to drive the atomization device to heat according to the atomization drive signal.

[0033] The external power source can be any type of mobile power supply or generator. The external power source is detachably connected to the low-power anti-backflow power supply circuit of this invention. The internal power source is an internal power pack with a certain energy storage capacity. In some preferred embodiments, the battery pack can be powered by lithium batteries or other rechargeable batteries. The internal power supply anti-backflow module 100 protects the internal power source from backflow by shutting off the branch containing the internal power source when the external power source is connected. Correspondingly, the external power supply anti-backflow module 200 protects the external power source from backflow by shutting off the branch containing the external power source when the internal power source is connected. Specifically, when the external power source is not connected, the internal power supply anti-backflow module 100 is turned on by default when it does not receive the external power source's operating signal, the negative terminal of the internal power source is grounded, and the internal power source operates. At this time, the control module 400 detects that the internal power supply is working and outputs an internal power supply working signal to the external power supply backflow prevention module 200. The first and second switch connection terminals of the external power supply backflow prevention module 200 are disconnected, thereby isolating the external power supply from other circuits of the low-power backflow prevention power supply circuit and preventing backflow of the external power supply through the second switch connection terminal of the external power supply backflow prevention module 200. Similarly, when the external power supply is connected, the first and second switch connection terminals of the external power supply backflow prevention module 200 are connected. At this time, the external power supply voltage provided by the external power supply is input to the atomization drive module 300 through the external power supply backflow prevention module 200, driving the atomization drive module 300 to work. When the control module 400 outputs an external power supply working signal, the first and second switch connection terminals of the internal power supply backflow prevention module 100 are disconnected when the control terminal detects the external power supply working signal. Therefore, the negative terminal B-1 of the internal power supply is not grounded, and the branch where the internal power supply is located is turned off, preventing the internal power supply from being backflowed. As can be seen, while achieving backflow prevention, the present invention requires only one switching transistor structure from the power supply to the atomization drive module 300, regardless of whether it is powered by an external power supply or an internal power supply, which greatly reduces the switching power loss of the entire circuit in order to achieve backflow prevention.

[0034] Please refer to further information. Figure 1 and Figure 3In some preferred embodiments of the present invention, the internal power supply backflow prevention module 100 includes a first resistor R1, a third resistor R3, and a second field-effect transistor Q2. One end of the first resistor R1 is connected to the positive terminal B+1 of the internal power supply, and the other end of the first resistor R1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the gate of the second field-effect transistor Q2. The source of the second field-effect transistor Q2 is grounded, and the drain of the second field-effect transistor Q2 is connected to the negative terminal B-1 of the internal power supply. The common terminal of the first resistor R1 and the third resistor R3 is connected to the internal power supply control terminal CON_BAT of the control module 400. The second field-effect transistor Q2 can be an NMOS transistor, meaning the external power supply operating signal is a low-level signal. When the internal power supply control terminal CON_BAT of the control module 400 outputs a high-level signal, the gate of the second field-effect transistor Q2 is pulled high, the source and drain of the second field-effect transistor Q2 are connected, and the negative terminal B-1 of the internal power supply is grounded, thus ensuring normal operation of the internal power supply. When the internal power supply control terminal CON_BAT of the control module 400 outputs a low-level signal, the source and drain of the second field-effect transistor Q2 are turned off. It should be noted that the second field-effect transistor Q2 can also be positioned at the positive terminal of the internal power supply; the specific implementation when it is at the positive terminal is existing technology and will not be elaborated upon here.

[0035] Furthermore, the external power supply backflow prevention module 200, as shown... Figure 4 As shown, the system includes: a third field-effect transistor Q3, a ninth resistor R9, and a thirteenth resistor R13. The gate of the third field-effect transistor Q3 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is grounded. The common terminal of the ninth resistor R9 and the thirteenth resistor R13 is connected to the external power supply control terminal CON_MBAT of the control module 400. The source of the third field-effect transistor Q3 is used to output the external power supply voltage.

[0036] Accordingly, the third field-effect transistor Q3 can be a PMOS transistor, meaning the internal power supply operating signal is a high-level signal. The third field-effect transistor Q3 is used to control the connection status between the external power supply and the internal circuits. In the initial state, the internal power supply is active, and the control module 400 outputs the internal power supply operating signal to the gate of the third field-effect transistor Q3. The gate of the third field-effect transistor Q3 is pulled high by the ninth resistor R9 and the thirteenth resistor R13, thus keeping the source and drain off. At this time, the power supply at the source of the third field-effect transistor Q3 will not flow back into the external power supply, preventing backflow. When the external power supply control terminal CON_MBAT of the control module 400 has no signal output, the gate of the third field-effect transistor Q3 is pulled low, and the external power supply is connected to the power supply circuit and provides the external power supply voltage for charging.

[0037] Please refer to the preferred embodiments of the present invention as well. Figure 1 and Figure 5 The control module 400 includes a power detection unit 410 and a microcontroller unit 420. The external power supply terminal of the power detection unit 410 is connected to the external power supply anti-backflow module 200. The internal power supply terminal of the power detection unit 410 is connected to the positive terminal B+1 of the internal power supply. The power output terminal of the power detection unit 410 is connected to the power supply terminal of the microcontroller unit 420. The internal power detection terminal of the power detection unit 410 is connected to the internal input detection terminal B_ADC of the microcontroller unit 420. The external power detection terminal of the power detection unit 410 is connected to the microcontroller unit 420. The external access detection terminal MB_ADC of unit 420 is connected; the power detection unit 410 is used to detect the access status of internal and external power supplies, and outputs the working voltage to the microcontroller unit 420 according to the internal or external power supply; the power detection unit 410 outputs an external power supply on signal to the microcontroller unit 420 when the external power supply is connected, and outputs an internal power supply on signal to the microcontroller unit 420 when the internal power supply is connected; the microcontroller unit 420 calculates the external power supply voltage according to the external power supply on signal, and calculates the internal power supply voltage according to the internal power supply on signal. Specifically, the power detection unit 410 has two detection branches, which are used to detect whether the internal power supply and external power supply are connected at the current time. When the internal or external power supply is connected, the control module 400 can detect whether the internal voltage is connected or the external voltage is connected according to whether it detects the working voltage at the internal access detection terminal B_ADC or the external access detection terminal MB_ADC, and calculate the corresponding input external power supply voltage and internal power supply voltage. The microcontroller unit 420 includes a microcontroller chip U2, the model of which is SC8F073AD720NPR.

[0038] The power detection unit 410 includes: an eighth resistor R8, an eleventh resistor R11, a fifteenth resistor R15, a seventeenth resistor R17, a third capacitor C3, a fourth capacitor C4, a first diode D1, and a second diode D2. One end of the eleventh resistor R11 is connected to the external power supply anti-backflow module 200, and the other end of the eleventh resistor R11 is connected to one end of the eighth resistor R8, the other end of which is grounded. One end of the third capacitor C3 is connected to the common terminal of the eighth resistor R8 and the eleventh resistor R11, and the other end of the third capacitor C3 is grounded. The common terminal of the eighth resistor R8, the eleventh resistor R11, and the third capacitor C3 is connected to the external input detection terminal MB_ADC of the microcontroller unit 420. One end of the fifteenth resistor R15 is connected to the positive terminal B+1 of the internal power supply. The other end of the fifteenth resistor R15 is connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded; one end of the fourth capacitor C4 is connected to the common terminal of the fifteenth resistor R15 and the seventeenth resistor R17, and the other end of the fourth capacitor C4 is grounded; the common terminal of the fifteenth resistor R15, the seventeenth resistor R17 and the fourth capacitor C4 is connected to the internal access detection terminal B_ADC of the microcontroller unit 420; the anode of the first diode D1 is connected to the common terminal of the external power supply anti-backflow module 200 and the eleventh resistor R11; the anode of the second diode D2 is connected to the common terminal of the internal power supply anti-backflow module 100 and the fifteenth resistor R15, and the cathodes of the first diode D1 and the second diode D2 are respectively connected to the power supply terminal of the microcontroller unit 420.

[0039] Specifically, after the external power supply voltage and the internal power supply voltage pass through the power detection unit 410, they are combined after being controlled by the unidirectional conduction of the first diode D1 and the second diode D2, and used to drive the microcontroller chip U2. The power detection unit 410 is also used to detect the voltage of the internal or external power supply. For example, when the external power supply is connected, the first and second switch connection terminals of the internal switch structure of the internal power supply anti-backflow module 100 are turned off. After the external power supply voltage flows into the power detection unit 410, the external access detection terminal MB_ADC of the microcontroller unit 420 detects the voltage value after voltage division by the eleventh resistor R11 and the eighth resistor R8. Then, the microcontroller chip U2 can calculate the external power supply voltage based on this voltage value. The calculation method of the external power supply voltage can be obtained by reverse calculation through ohmic voltage division, which is the prior art in this field and will not be described in detail here.

[0040] In some preferred embodiments of the present invention, the atomization driving module 300 includes at least one atomizer driving unit. The first power input terminal of the atomizer is connected to an external power source through the external power anti-backflow module 200. The second power input terminal of the atomizer driving unit is connected to the positive terminal B+1 of the internal power source. The first control terminal of the atomizer driving unit is connected to the first atomization control terminal of the control module 400, and the second control terminal of the atomizer driving unit is connected to the second atomization control terminal of the control module 400. The atomizer control terminal of the atomizer driving unit is connected to the positive terminal of the atomizer, and the negative terminal of the atomizer is grounded. When the atomizer driving unit is connected to an external power source, it controls the working state of the atomizer through the first atomization control terminal. When the atomizer driving unit is connected to an internal power source, it controls the working state of the atomizer through the second atomization control terminal.

[0041] Specifically, the number of atomizer driving units can be set according to the number of atomizers in the circuit. The atomizers are connected in parallel. Therefore, for each atomizer, to simultaneously adapt to both external and internal power supplies, each atomizer driving unit includes an external power supply branch for driving according to the external power supply voltage and an internal power supply branch for driving according to the internal power supply voltage. This atomizer driving unit is located on the branch corresponding to the atomizer. It should be noted that each atomizer branch may also contain circuit units with other functions. The circuit structure on each atomizer branch is consistent; that is, the circuits of the atomizer driving units in each atomizer branch are the same. There can be one or more atomizer driving units. For ease of explanation, the internal connection relationship of the atomizer driving unit is described using the first atomizer driving unit 310 as an example.

[0042] The atomizer driving unit includes: a first field-effect transistor Q1, a fourth field-effect transistor Q4, a fourth resistor R4, a seventh resistor R7, a tenth resistor R10, a twelfth resistor R12, and a fourteenth resistor R14; wherein, the source of the first field-effect transistor Q1 is connected to the external power supply through the external power supply anti-backflow module 200; the gate of the first field-effect transistor Q1 is connected to one end of the seventh resistor R7; the other end of the seventh resistor R7 is connected to the first atomization control terminal of the control module 400; one end of the fourth resistor R4 is connected to the source of the first field-effect transistor Q1; the other end of the fourth resistor R4 is connected to the gate of the first field-effect transistor Q1; the drain of the first field-effect transistor Q1 is connected to the positive terminal of the atomizer; The source of the fourth field-effect transistor Q4 is connected to the internal power supply through the internal power supply anti-backflow module 100. The gate of the fourth field-effect transistor Q4 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the second atomization control terminal of the control module 400. One end of the tenth resistor R10 is connected to the source of the fourth field-effect transistor Q4, and the other end of the tenth resistor R10 is connected to the gate of the fourth field-effect transistor Q4. The drain of the fourth field-effect transistor Q4 is connected to the positive terminal of the atomizer. One end of the fourteenth resistor R14 is connected to the positive terminal of the atomizer, and the other end of the fourteenth resistor R14 is connected to the internal power supply detection terminal of the control module 400 for internal power supply voltage detection.

[0043] Further, in some preferred embodiments of the present invention, the atomization driving module 300 includes a first atomizer driving unit 310 and a second atomizer driving unit 320. The first atomizer driving unit is used to drive the first atomizer, and the second atomizer driving unit 320 is used to drive the second atomizer. The first atomizer and the second atomizer are grounded together. The internal structure of the first atomizer driving unit 310 is the same as described above. One end of the fourteenth resistor R14, the drain of the first field-effect transistor Q1, and the drain of the fourth field-effect transistor Q4 are connected to the positive terminal of the first atomizer. The second atomizer driving unit 320 is connected to the first atomizer driving unit 310. The second atomizer driving unit 320 includes: a fifth field-effect transistor Q5, a sixth field-effect transistor Q6, a sixteenth resistor R16, an eighteenth resistor R18, a twentieth resistor R20, a twenty-first resistor R21, and a nineteenth resistor R19; wherein, the source of the fifth field-effect transistor Q5 is connected to an external power supply through the external power supply anti-backflow module 200, the gate of the fifth field-effect transistor Q5 is connected to one end of the eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected to the third atomization control terminal of the control module 400, one end of the sixteenth resistor R16 is connected to the source of the fifth field-effect transistor Q5, and the other end of the sixteenth resistor R16 is connected to the gate of the fifth field-effect transistor Q5; the drain of the fifth field-effect transistor Q5 is connected to the second atomizer... Positive terminal connection; the source of the sixth field-effect transistor Q6 is connected to the internal power supply through the internal power supply anti-backflow module 100; the gate of the sixth field-effect transistor Q6 is connected to one end of the 21st resistor R21; the other end of the 21st resistor R21 is connected to the fourth atomization control terminal of the control module 400; one end of the 20th resistor R20 is connected to the source of the sixth field-effect transistor Q6; the other end of the 20th resistor R20 is connected to the gate of the sixth field-effect transistor Q6; the drain of the sixth field-effect transistor Q6 is connected to the positive terminal of the second atomizer; one end of the 19th resistor R19 is connected to the positive terminal of the second atomizer; the other end of the 19th resistor R19 is connected to the internal power supply detection terminal of the control module 400 for internal power supply voltage detection.

[0044] Specifically, such as Figure 3 As shown, the low-power anti-backflow power supply circuit may further include a voltage regulator module 500. The voltage input terminal of the voltage regulator module 500 is connected to the internal power supply, and the voltage output terminal of the voltage regulator module 500 is used to output a 5V voltage, suitable for other low-power voltage devices. The voltage regulator module 500 can adopt any voltage regulator circuit in the prior art, which will not be described in detail here.

[0045] Please refer to the following: Figure 3 , Figure 4 , Figure 5 and Figure 6 The 5V pad is connected to the external charging case's boost output of 5V. The DATA pad is connected to the charging case's data port. The GND pad is grounded. The MB+ pad is connected to the external power supply's positive terminal. The B+1 pad is connected to the internal power supply's positive terminal B+1, and the B-1 pad is connected to the internal power supply's negative terminal B-1. The internal power supply can be the internal battery, and the external power supply can be the external charging case. The third MOSFET Q3 controls the voltage flow from the M_B+ terminal to the MB+ pad. Pin 2 of the microcontroller U2 outputs a high level to disable and a low level to enable; the default is disable. The second MOSFET Q2 controls the connection between the internal power supply ground and the external battery ground. Pin 4 of the microcontroller U2 outputs a low level to disable and a high level to enable; the second MOSFET Q2 is enabled by default. When the internal power supply is on, B+ connects to the fourth MOSFET Q4 and the fifth MOSFET Q5, controlling the output power of the two heating coil atomizers respectively, before returning to the internal power supply's negative terminal B-1 via the second MOSFET Q2. When the fourth MOSFET Q4 and the fifth MOSFET Q5 are turned on, the first MOSFET Q1 and the sixth MOSFET Q6 will also have voltage on M_B+ due to the internal diode. However, when the third MOSFET is turned off, power cannot flow back to the MB+ pad. Thus, the entire circuit only needs to pass through a maximum of two MOSFETs. When using an external battery, M_B+ is connected to the first MOSFET Q1 and the sixth MOSFET Q6, controlling the output power of the two heating wire atomizers respectively. The external battery is connected to the MB+ pad via the third MOSFET Q3. When the first MOSFET Q1 and the sixth MOSFET Q6 are turned on, the fourth MOSFET Q4 and the fifth MOSFET Q5 will also have voltage on B+ due to the internal diode. However, when using external power for atomization, the second MOSFET Q2 is turned off, preventing backflow to the internal power supply. Therefore, the entire circuit of this invention only needs to pass through a maximum of two MOSFETs, reducing circuit losses.

[0046] Secondly, the present invention also provides an electronic cigarette, which includes the low-power anti-backflow power supply circuit described above. Its specific implementation is as described in the specific implementation of the low-power anti-backflow power supply circuit, and will not be repeated here.

[0047] This invention provides a low-power anti-backflow power supply circuit and an electronic cigarette. The low-power anti-backflow power supply circuit includes an internal power supply anti-backflow module, an external power supply anti-backflow module, an atomization drive module, and a control module. The power supply terminal of the internal power supply anti-backflow module is connected to the positive terminal of the internal power supply and is also connected to the control module and the atomization drive module. The control terminal of the internal power supply anti-backflow module is connected to the internal power supply control terminal of the control module. The first switch connection terminal of the internal power supply anti-backflow module is grounded, and the second switch connection terminal is connected to the negative terminal of the internal power supply. The first and second switch connection terminals of the internal power supply anti-backflow module disconnect when the control terminal detects an external power supply operating signal to prevent backflow into the internal power supply. The first switch connection terminal of the external power supply anti-backflow module is connected to an external power supply. The second switch connection terminal of the module is connected to the control module and the atomization drive module respectively. The control terminal of the external power supply backflow prevention module is connected to the external power supply control terminal of the control module. The first and second switch connection terminals of the external power supply backflow prevention module are disconnected when the control terminal detects the internal power supply working signal to prevent the external power supply from being backflowed. The atomization control terminal of the control module is connected to the control terminal of the atomization drive module to detect the connection status of the internal and external power supplies and output an atomization drive signal to the atomization drive module. When the external power supply is connected, it outputs an external power supply working signal to the internal power supply backflow prevention module, and when the internal power supply is connected, it outputs an internal power supply working signal to the external power supply backflow prevention module. The atomization drive module is connected to the atomization device and drives the atomization device to heat according to the atomization drive signal. In this invention, by having only one power supply backflow prevention module working during power supply, the power supply voltage only needs to pass through one switching transistor at the same time to achieve the backflow prevention function of the internal and external power supplies, reducing the power loss of the switching transistor and improving the circuit's endurance.

[0048] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A low-power anti-backflow power supply circuit, characterized in that, include: The system includes an internal power supply backflow prevention module, an external power supply backflow prevention module, an atomization drive module, and a control module; among which... The power supply terminal of the internal power supply anti-backflow module is connected to the positive terminal of the internal power supply and is also connected to the control module and the atomization drive module. The control terminal of the internal power supply anti-backflow module is connected to the internal power supply control terminal of the control module. The first switch connection terminal of the internal power supply anti-backflow module is grounded, and the second switch connection terminal of the internal power supply anti-backflow module is connected to the negative terminal of the internal power supply. The first and second switch connection terminals of the internal power supply anti-backflow module are disconnected when the control terminal detects an external power supply working signal to prevent the internal power supply from being backflowed. The first switch connection terminal of the external power supply anti-backflow module is connected to an external power supply, and the second switch connection terminal of the external power supply anti-backflow module is connected to the control module and the atomization drive module respectively. The control terminal of the external power supply anti-backflow module is connected to the external power supply control terminal of the control module. The first and second switch connection terminals of the external power supply anti-backflow module are disconnected when the control terminal detects the internal power supply working signal to prevent the external power supply from being backflowed. The atomization control terminal of the control module is connected to the control terminal of the atomization drive module. It is used to detect the access status of the internal power supply and the external power supply and output the atomization drive signal to the atomization drive module. When the external power supply is connected, it outputs the external power supply working signal to the internal power supply anti-backflow module. When the internal power supply is connected, it outputs the internal power supply working signal to the external power supply anti-backflow module. The atomization drive module is connected to the atomization device and is used to drive the atomization device to heat up according to the atomization drive signal.

2. The low-power anti-backflow power supply circuit according to claim 1, characterized in that, The internal power supply backflow prevention module includes a first resistor, a third resistor, and a second field-effect transistor, wherein... One end of the first resistor is connected to the positive terminal of the internal power supply, the other end of the first resistor is connected to one end of the third resistor, the other end of the third resistor is connected to the gate of the second field-effect transistor, the source of the second field-effect transistor is grounded, and the drain of the second field-effect transistor is connected to the negative terminal of the internal power supply; the common terminal of the first resistor and the third resistor is connected to the internal power supply control terminal of the control module.

3. The low-power anti-backflow power supply circuit according to claim 1, characterized in that, The control module includes a power detection unit and a microcontroller unit, wherein... The external power supply terminal of the power detection unit is connected to the external power supply anti-backflow module, the internal power supply terminal of the power detection unit is connected to the positive terminal of the internal power supply, and the power output terminal of the power detection unit is connected to the power supply terminal of the microcontroller unit; the internal power supply detection terminal of the power detection unit is connected to the internal access detection terminal of the microcontroller unit, and the external power supply detection terminal of the power detection unit is connected to the external access detection terminal of the microcontroller unit; the power detection unit is used to detect the access status of the internal and external power supplies, and outputs a working voltage to the microcontroller unit according to the internal or external power supply; the power detection unit outputs an external power supply on signal to the microcontroller unit when the external power supply is connected, and outputs an internal power supply on signal to the microcontroller unit when the internal power supply is connected; The microcontroller calculates the external power supply voltage based on the external power supply connection signal and calculates the internal power supply voltage based on the internal power supply connection signal.

4. The low-power anti-backflow power supply circuit according to claim 3, characterized in that, The power detection unit includes: an eighth resistor, an eleventh resistor, a fifteenth resistor, a seventeenth resistor, a third capacitor, a fourth capacitor, a first diode, and a second diode; wherein, One end of the eleventh resistor is connected to the external power supply anti-backflow module, and the other end of the eleventh resistor is connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded; one end of the third capacitor is connected to the common terminal of the eighth and eleventh resistors, and the other end of the third capacitor is grounded; the common terminal of the eighth, eleventh, and third resistors is connected to the external access detection terminal of the microcontroller unit. One end of the fifteenth resistor is connected to the positive terminal of the internal power supply, and the other end of the fifteenth resistor is connected to one end of the seventeenth resistor, the other end of the seventeenth resistor is grounded; one end of the fourth capacitor is connected to the common terminal of the fifteenth resistor and the seventeenth resistor, and the other end of the fourth capacitor is grounded; the common terminal of the fifteenth resistor, the seventeenth resistor and the fourth capacitor is connected to the internal access detection terminal of the microcontroller unit. The anode of the first diode is connected to the common terminal of the external power supply anti-backflow module and the eleventh resistor; the anode of the second diode is connected to the common terminal of the internal power supply anti-backflow module and the fifteenth resistor; and the cathodes of the first diode and the second diode are respectively connected to the power supply terminal of the microcontroller unit.

5. The low-power anti-backflow power supply circuit according to claim 1, characterized in that, The external power supply backflow prevention module includes: a third field-effect transistor, a ninth resistor, and a thirteenth resistor, wherein, The gate of the third field-effect transistor is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is grounded; the common terminal of the ninth and thirteenth resistors is connected to the external power supply control terminal of the control module; the source of the third field-effect transistor is used to output the external power supply voltage.

6. The low-power anti-backflow power supply circuit according to claim 1, characterized in that, The atomization driving module includes at least one atomizer driving unit. The first power input terminal of the atomizer is connected to an external power source through the external power anti-backflow module. The second power input terminal of the atomizer driving unit is connected to the positive terminal of the internal power source. The first control terminal of the atomizer driving unit is connected to the first atomization control terminal of the control module, and the second control terminal of the atomizer driving unit is connected to the second atomization control terminal of the control module. The atomizer control terminal of the atomizer driving unit is connected to the positive terminal of the atomizer, and the negative terminal of the atomizer is grounded. When the atomizer driving unit is connected to an external power source, it controls the working state of the atomizer through the first atomization control terminal. When the atomizer driving unit is connected to an internal power source, it controls the working state of the atomizer through the second atomization control terminal.

7. The low-power anti-backflow power supply circuit according to claim 6, characterized in that, The atomizer driving unit includes: a first field-effect transistor, a fourth field-effect transistor, a fourth resistor, a seventh resistor, a tenth resistor, a twelfth resistor, and a fourteenth resistor; wherein, The source of the first field-effect transistor is connected to the external power supply through the external power supply anti-backflow module; the gate of the first field-effect transistor is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the first atomization control terminal of the control module; one end of the fourth resistor is connected to the source of the first field-effect transistor; the other end of the fourth resistor is connected to the gate of the first field-effect transistor; and the drain of the first field-effect transistor is connected to the positive terminal of the atomizer. The source of the fourth field-effect transistor is connected to the internal power supply through the internal power supply anti-backflow module. The gate of the fourth field-effect transistor is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the second atomization control terminal of the control module. One end of the tenth resistor is connected to the source of the fourth field-effect transistor, and the other end of the tenth resistor is connected to the gate of the fourth field-effect transistor. The drain of the fourth field-effect transistor is connected to the positive terminal of the atomizer. One end of the fourteenth resistor is connected to the positive terminal of the atomizer, and the other end of the fourteenth resistor is connected to the internal power supply detection terminal of the control module for internal power supply voltage detection.

8. The low-power anti-backflow power supply circuit according to claim 6, characterized in that, The atomization driving module includes a first atomizer driving unit and a second atomizer driving unit. The first atomizer driving unit is used to drive the first atomizer, and the second atomizer driving unit is used to drive the second atomizer. The first atomizer and the second atomizer are grounded together.

9. The low-power anti-backflow power supply circuit according to claim 3, characterized in that, The microcontroller unit includes a microcontroller chip, the model of which is SC8F073AD720NPR.

10. An electronic cigarette, characterized in that, The electronic cigarette includes a low-power anti-backflow power supply circuit as described in any one of claims 1-9.

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