CN218219186U

CN218219186U - Atomization device and short circuit generation large-current protection circuit thereof

Info

Publication number: CN218219186U
Application number: CN202222222444.2U
Authority: CN
Inventors: 旷霜粮; 周勇; 郭国义; 肖伶芝
Original assignee: Shenzhen Woody Vapes Technology Co Ltd
Current assignee: Shenzhen Woody Vapes Technology Co Ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2023-01-06
Anticipated expiration: 2032-08-23

Abstract

The application relates to the technical field of electronic products and discloses an atomization device and a short-circuit generation large-current protection circuit thereof. The atomization device comprises a power supply, a fuse, an MOS (metal oxide semiconductor) tube, a fixed-value resistor, an abnormal detection point and an over-temperature protection device; two ends of the fuse are respectively connected with a power supply anode and a drain electrode of the MOS tube, a grid electrode of the MOS tube is connected with the over-temperature protection device, and one end of an abnormal detection point is connected with a source electrode of the MOS tube and one end of a constant value resistor; the other end of the abnormal detection point is respectively connected with the over-temperature protection device and the ground wire so as to detect whether the rear end of the circuit is short-circuited, if the abnormal detection point is short-circuited, the over-temperature protection device feeds back a signal to the grid of the MOS tube so as to cut off power supply, and meanwhile, the over-temperature protection device is respectively connected with the other end of the constant value resistor and the negative electrode of the power supply. Have the internal circuit who optimizes atomizing device in this application to promote the effect of the security that atomizing device used.

Description

Atomization device and short circuit generation large-current protection circuit thereof

Technical Field

The application relates to the technical field of electronic products, in particular to an atomization device and a short-circuit generation large-current protection circuit thereof.

Background

The atomizing device as an electronic product capable of atomizing liquid into atomized particles mainly comprises four parts of liquid, a heating system, a power supply and a filter tip. In the existing atomization device products, a power supply is usually directly connected with a heating system, and related protection devices are not arranged in a circuit, so that when a circuit board device is short-circuited, a fire is easily started and a machine is burnt. Therefore, the internal circuit of the atomization device needs to be optimized, so as to improve the use safety of the atomization device.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved is to optimize atomizing device's internal circuit to promote the security that atomizing device used.

In a first aspect, the application provides an atomization device and a protection circuit for generating a large current by short circuit thereof, which comprise a power supply, a fuse, an MOS (metal oxide semiconductor) tube, a fixed value resistor, an abnormal detection point and an over-temperature protection device; the two ends of the fuse are respectively connected with the anode of the power supply and the drain of the MOS tube, the grid of the MOS tube is connected with the over-temperature protection device, and one end of the abnormal detection point is connected with the source of the MOS tube and one end of the constant resistor; the other end of the abnormal detection point is respectively connected with the over-temperature protection device and the ground wire so as to detect whether the rear end of the circuit is short-circuited, if the abnormal detection point is short-circuited, the over-temperature protection device feeds back a signal to the grid electrode of the MOS tube so as to cut off power supply, and meanwhile, the over-temperature protection device is respectively connected with the other end of the constant value resistor and the negative electrode of the power supply.

Preferably, the over-temperature protection device comprises a single chip microcomputer and a temperature control resistor, one end of the temperature control resistor is connected with one end of the constant value resistor to form a first connection point, the detection end of the single chip microcomputer is connected with the first connection point, the other end of the temperature control resistor is connected with the end, grounded at the abnormal detection point, to form a second connection point, the grounding end of the single chip microcomputer is connected with the second connection point, and the negative connection end of the single chip microcomputer is connected with the negative electrode of the power supply.

Preferably, the power supply further comprises a voltage reduction circuit, wherein the input end of the voltage reduction circuit is connected with the positive electrode of the power supply, and the output end of the voltage reduction circuit is connected with the input end of the single chip microcomputer.

Preferably, the MOS tube is a field effect tube enhanced PMOS tube.

Preferably, the positive connecting end of the single chip microcomputer is connected with the source electrode of the MOS tube.

Preferably, the negative electrode of the power supply is grounded.

Preferably, the temperature control resistor is an NTC thermistor.

Preferably, the output end of the voltage reduction circuit is 3.3V.

Preferably, the fuse can pass a maximum current of 30A.

In a second aspect, embodiments of the present application provide an atomization device including a short-circuit generating high-current protection circuit as described in the first aspect above.

Compared with the prior art, the method has at least one of the following beneficial technical effects:

when the device short circuit automatic ignition appears in the ignition output heavy current circuit, the temperature control resistor makes the internal resistance grow because of high temperature, and then leads to the voltage increase, and the singlechip detects the voltage anomaly back of temperature control resistor, with the grid of signal feedback to PMOS pipe with the disconnection power supply to protection atomizing device circuit and organism avoid causing the machine that burns on fire because of the device short circuit. The fuse, the PMOS tube and the over-temperature protection device are added in the main circuit of the battery, so that the problem that the board is ignited and burned due to loss and short circuit of the rear-end device is solved, and the use safety of a user is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of a protection circuit according to the present application.

Description of reference numerals: v1, a power supply; v2, a voltage reduction circuit; FU, fuse; r, a constant value resistor; b. Detecting an abnormal point; u, a singlechip; u _1 and the positive connecting end of the single chip microcomputer; u _2 and a negative electrode connecting end of the single chip microcomputer; u _3 and a feedback end of the single chip microcomputer; u _4, a detection end of the single chip microcomputer; u _5 and a singlechip grounding end; u _6 and the input end of the single chip microcomputer.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present invention provides a short circuit generates a large current protection circuit, which includes a power supply V1, a fuse FU, a MOS transistor, a fixed resistance R, an abnormal detection point B, and an over-temperature protection device. Herein, through increasing fuse FU, MOS pipe and excess temperature protection device in the main circuit of battery, prevent to appear because of the device damage short circuit of rear end leads to the board to catch fire the machine problem, safe effectual protection user's life and property safety.

Specifically, the over-temperature protection device comprises a single chip microcomputer U and a temperature control resistor, wherein the single chip microcomputer U is provided with a positive connecting end U _1, a negative connecting end U _2, a feedback end U _3, a detection end U _4, a grounding end U _5 and an input end U _6; one end of the temperature control resistor is connected with one end of the fixed value resistor R to form a first connection point, one end of the abnormal detection point B which is grounded is connected with the other end of the temperature control resistor to form a second connection point, and the second connection point is grounded. The MOS transistor has a gate, a source and a drain, and since the PMOS integrated circuit is a device suitable for low-speed and low-frequency applications, the MOS transistor in this embodiment is a field-effect transistor enhanced PMOS transistor, so as to be applied to the main circuit of the battery of the atomization device.

Here, the positive electrode of the power supply V1 is connected with one end of the fuse FU, and the negative electrode of the power supply V1 is grounded; the other end of the fuse FU is connected with a drain electrode of a PMOS (P-channel metal oxide semiconductor) tube, a grid electrode of the PMOS tube is connected with a feedback end U _3 of the singlechip U, and a source electrode of the PMOS tube is respectively connected with one end of an abnormality detection point B and an anode connecting end U _1 of the singlechip U so that the singlechip U detects whether the power supply voltage is abnormal; the detection end U _4 of the single chip microcomputer U is connected with the first connection point, the grounding end U _5 of the single chip microcomputer U is connected with the second connection point, and the negative electrode connection end U _2 of the single chip microcomputer U is connected with the negative electrode of the power supply V1.

In this embodiment, the NTC thermistor is used as the temperature control resistor, because at the moment when the circuit power is turned on, a surge current many times higher than that in normal operation is generated in the circuit, and the NTC thermistor has a large initial resistance value, so that an excessive current in the circuit can be suppressed, thereby protecting the power circuit and the load; when the circuit enters a normal working state, the NTC thermistor leads the temperature of the resistor body to rise due to the passing of current, the resistance value is reduced to be very small, and the normal working of the circuit cannot be influenced.

When the device short circuit automatic ignition occurs at the abnormal detection point B, the output MOS tube generates continuous heating high temperature due to large current, the internal resistance value of the temperature control resistor is increased due to the high temperature, and after the detection end U _4 of the singlechip U detects the abnormality, a signal is fed back to the grid electrode of the PMOS tube to cut off the power supply, so that the main circuit is protected. Here, the constant value resistor R performs voltage division to reflect a change in the temperature control resistor voltage value.

In order to stably supply low-voltage power to the singlechip U so as to prevent the singlechip U from short circuit, the circuit further comprises a voltage reduction circuit V2. The input U _6 of the voltage reduction circuit V2 is connected with the positive pole of the power supply V1, the output end of the voltage reduction circuit V2 is connected with the input U _6 of the single chip microcomputer U, the output end of the voltage reduction circuit V2 is 3.3V, the voltage of the power supply V1 is reduced through the voltage reduction circuit V2, and the working stability of the single chip microcomputer U is improved.

In addition, the fuse FU selected in this embodiment has a maximum current of 30A. When the current is greater than 30A, fuse FU self fuses and cuts off the current, thereby playing the effect of protecting the safe operation of the circuit, preventing the device in the atomizing device from being damaged or the circuit from being burnt due to overhigh current, even causing fire, and further improving the use safety of the atomizing device.

The embodiment of the application also discloses an atomizing device, including producing heavy current protection circuit like above-mentioned short circuit, through increase fuse FU, PMOS pipe and NTC thermistor in this protection circuit, prevent to lead to the machine of burning out on fire because of the device loss short circuit of rear end, promote the security that the user used this atomizing device.

The implementation principle of the atomization device and the short-circuit generation large-current protection circuit thereof is as follows: when the device short circuit auto-ignition occurs at the abnormal detection point B, the internal resistance value of the NTC thermistor is increased due to high temperature, and then the voltage is increased, and after the single chip microcomputer U detects that the voltage of the NTC thermistor is abnormal, a signal is fed back to the grid electrode of the PMOS tube to cut off the power supply, so that the circuit and the machine body of the atomization device are protected, and the phenomenon that the device is ignited and burnt due to the short circuit is avoided. In the main circuit of the battery, the fuse FU, the PMOS tube and the NTC thermistor are added, so that the problem that the board is ignited and burnt due to the loss and short circuit of the rear-end device is prevented, and the use safety of a user is ensured.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A short circuit produces heavy current protection circuit which characterized in that: the over-temperature protection circuit comprises a power supply (V1), a Fuse (FU), an MOS (metal oxide semiconductor) tube, a fixed value resistor (R), an abnormal detection point (B) and an over-temperature protection device;

two ends of the Fuse (FU) are respectively connected with the anode of the power supply (V1) and the drain electrode of the MOS tube, the grid electrode of the MOS tube is connected with the over-temperature protection device, one end of the abnormal detection point (B) is connected with the source electrode of the MOS tube and is connected with one end of the constant value resistor (R);

the other end of the abnormal detection point (B) is connected with the over-temperature protection device and the ground wire respectively to detect whether the rear end of the circuit is short-circuited, if the abnormal detection point (B) is short-circuited, the over-temperature protection device feeds back a signal to the grid of the MOS tube to cut off power supply, and meanwhile, the over-temperature protection device is connected with the other end of the constant resistor (R) and the negative electrode of the power supply (V1) respectively.

2. The short-circuit generated large-current protection circuit as claimed in claim 1, wherein the over-temperature protection device comprises a single chip (U) and a temperature control resistor, one end of the temperature control resistor is connected with one end of the constant value resistor (R) to form a first connection point, a detection end (U _ 4) of the single chip (U) is connected with the first connection point, the other end of the temperature control resistor is connected with one end of the abnormal detection point (B) which is grounded to form a second connection point, a grounding end (U _ 5) of the single chip (U) is connected with the second connection point, and a negative connection end (U _ 2) of the single chip (U) is connected with the negative electrode of the power supply (V1).

3. A short-circuit generating high-current protection circuit as claimed in claim 2, further comprising a voltage-reducing circuit (V2), wherein an input terminal (U _ 6) of the voltage-reducing circuit (V2) is connected to the positive electrode of the power supply (V1), and an output terminal of the voltage-reducing circuit (V2) is connected to the input terminal (U _ 6) of the single-chip microcomputer (U).

4. The short-circuit generated high-current protection circuit as claimed in claim 1, wherein said MOS transistor is a field effect transistor enhanced PMOS transistor.

5. The short-circuit generated large-current protection circuit as claimed in claim 2, wherein the positive connection terminal (U _ 1) of the single chip microcomputer (U) is connected with the source electrode of the MOS transistor.

6. A short-circuit generating high-current protection circuit as claimed in claim 1, characterized in that the negative pole of the power supply (V1) is grounded.

7. The short-circuit generating high-current protection circuit as claimed in claim 2, wherein said temperature-controlled resistor is selected from an NTC thermistor.

8. A short-circuit generating high-current protection circuit as claimed in claim 3, wherein the output of said voltage-reducing circuit (V2) is 3.3V.

9. A short-circuit generating high-current protection circuit as claimed in claim 1, wherein said Fuse (FU) is capable of passing a maximum current of 30A.

10. An atomizer device, characterized in that it comprises a short-circuit generating high-current protection circuit according to any one of claims 1 to 9.