CN214041700U - MOSFET short circuit detection circuit - Google Patents
MOSFET short circuit detection circuit Download PDFInfo
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- CN214041700U CN214041700U CN202023197949.5U CN202023197949U CN214041700U CN 214041700 U CN214041700 U CN 214041700U CN 202023197949 U CN202023197949 U CN 202023197949U CN 214041700 U CN214041700 U CN 214041700U
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Abstract
The utility model discloses a MOSFET short circuit detection circuit, which comprises a MOSFET, a MOSFET detection circuit, a single chip microcomputer MCU, a battery management chip, a voltage stabilization control circuit, a fuse and a load; the voltage stabilization control circuit is used for providing voltage for the battery management chip, the battery management chip is used for collecting voltage, current and temperature data of each battery, and transmits the voltage, the current and the temperature data to the single chip microcomputer MCU, the MOSFET detection circuit is used for detecting whether the MOSFET is in short circuit or not, and sends a short circuit signal to the single chip microcomputer MCU, the single chip microcomputer MCU is used for controlling charging and discharging of the MOSFET, and controlling fuse fusing when the MOSFET is in short circuit, and load current is cut off. The utility model discloses a MOSFET detection circuitry can real-time detection MOSFET short circuit whether, and MOSFET detection circuitry can export a short circuit signal and give the MCU singlechip when the MOSFET short circuit, and the MCU singlechip will go to detect the abnormal current that discharges, melts the fuse again, cuts off load current to guarantee battery and system safety.
Description
Technical Field
The utility model relates to a detection circuitry, the more specifically MOSFET short circuit detection circuitry that says so.
Background
With the continuous development of microelectronic technology, the miniaturization electronic equipment is increasing day by day, the traditional batteries such as lead-acid batteries are more and more difficult to meet the market demand, and the lithium ion batteries with more obvious advantages start to move to the public, compared with other rechargeable batteries, the lithium ion batteries have the advantages of high energy density, high voltage, long service life, high charging and discharging speed and the like, when the lithium batteries enter a large-scale application stage, the lithium batteries become indispensable products in our lives, and when electric tools, mobile power supplies, dust collectors, portable equipment and numerous electronic products which are used daily, the safety of lithium battery units needs to be ensured, and the reliability of a lithium battery protection board BMS of the lithium battery protection board must be ensured to be reliable; lithium battery BMS is lithium battery management system, can effectually carry out effectual control, protection, energy balance and malfunction alerting to lithium cell group, and then improve work efficiency, life and the security of whole power battery group.
At present, a lithium battery management system in the market only has the functions of basic battery pack overcharge, overdischarge, overcurrent, short circuit and temperature protection, and the whole battery pack protection plate cannot be controlled at the moment due to failure of an MOSFET (metal oxide semiconductor field effect transistor) element caused by static electricity or other environmental factors.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a MOSFET short circuit detection circuitry.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a MOSFET short circuit detection circuit comprises a MOSFET, a MOSFET detection circuit, a single chip Microcomputer (MCU), a battery management chip, a voltage stabilization control circuit, a fuse and a load; the voltage stabilization control circuit is used for providing voltage for the battery management chip, the battery management chip is used for collecting voltage, current and temperature data of each battery and transmitting the data to the single chip microcomputer MCU, the MOSFET detection circuit is used for detecting whether the MOSFET is in short circuit or not and sending a short circuit signal to the single chip microcomputer MCU, the single chip microcomputer MCU is used for controlling the charging and discharging MOSFET and controlling fuse fusing when the MOSFET is in short circuit, and load current is cut off.
The further technical scheme is as follows: the MOSFET detection circuit comprises a triode Q1, a triode Q2, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1; an emitter of the triode Q1 is connected with the voltage regulation control circuit, one end of the resistor R2 is connected with an emitter of the triode Q1, the other end of the resistor R2 is connected with a base of the triode Q1, the capacitor C1 is connected in parallel with two ends of the resistor R2, one end of the resistor R3 is connected with a negative electrode of a load, the other end of the resistor R3 is connected with a base of the triode Q1, one end of the resistor R4 is connected with a collector of the triode Q1, the other end of the resistor R4 is connected with a base of the triode Q2, one end of the resistor R5 is connected with a base of the triode Q2, and the other end of the resistor R5 is connected with GND; the emitting electrode of the triode Q2 is connected with GND, and the collecting electrode of the triode Q2 is connected with the voltage-stabilizing control circuit.
The further technical scheme is as follows: the voltage stabilization control circuit is a 3.3V voltage stabilization control circuit.
The further technical scheme is as follows: the fuse comprises a first connecting end, a second connecting end and a third connecting end; the first connecting end is connected with the anode of the load, the second connecting end is connected with the MCU, and the third connecting end is connected with the battery.
The further technical scheme is as follows: the load is a motor.
The further technical scheme is as follows: the low-voltage driving circuit is also included; the single chip microcomputer MCU is connected with the low-voltage driving circuit, the low-voltage driving circuit is connected with the grid electrode of the MOSFET, and the drain electrode of the MOS FET is connected with the negative electrode of the motor and one end of the resistor R3.
The further technical scheme is as follows: the signal adopted by the MCU is HT66F0195-24 PIN.
Compared with the prior art, the utility model beneficial effect be: the utility model discloses a MOSFET detection circuitry can real-time detection MOSFET short circuit whether, and MOSFET detection circuitry can export a short circuit signal and give the MCU singlechip when the MOSFET short circuit, and the MCU singlechip will go to detect the abnormal current that discharges, melts the fuse again, cuts off load current to guarantee battery and system safety.
The foregoing is a summary of the present invention, and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments, which is provided for the purpose of illustration and understanding of the present invention.
Drawings
Fig. 1 is a schematic circuit diagram of a specific embodiment of a MOSFET short circuit detection circuit according to the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "secured" are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," some embodiments, "" an example, "" a specific example, "" or "some examples," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
The utility model is suitable for an among the lithium battery protection shield BMS, because of present most domestic lithium battery protection shield BMS designs has overcurrent protection function, but the design has the secondary protect function that discharges very rarely, under the strong environment of some static, do not consider the harm that discharge MOSFET breaks down and brings, when discharge MOSFET breaks down, the battery package discharges, the load is in work uncontrolled always, the invention has increased MOSFET short circuit detection circuitry in lithium battery protection shield BMS, can real-time detection MOSFET short circuit, detection circuitry can export a signal to the singlechip when MOSFET short circuit, the singlechip can go to detect discharge abnormal current, fuses three terminal fuse again, the system can automatic cutout current path, guarantee battery and system safety. The invention will be described below by means of specific embodiments.
Referring to fig. 1, a MOSFET short circuit detection circuit includes a MOSFET, a MOSFET detection circuit, a single-chip microcomputer MCU, a battery management chip, a voltage stabilization control circuit, a fuse, and a load; the voltage stabilization control circuit is used for providing voltage for the battery management chip, the battery management chip is used for collecting voltage, current and temperature data of each battery, and transmits the voltage, the current and the temperature data to the single chip microcomputer MCU, the MOSFET detection circuit is used for detecting whether the MOSFET is in short circuit or not, and sends a short circuit signal to the single chip microcomputer MCU, the single chip microcomputer MCU is used for controlling charging and discharging of the MOSFET, and controlling fuse fusing when the MOSFET is in short circuit, and load current is cut off. The MOSFET short circuit detection circuit also comprises a low-voltage driving circuit; the single chip microcomputer MCU is connected with a low-voltage driving circuit, the low-voltage driving circuit is connected with a grid electrode of the MOSFET, and a drain electrode of the MOSFET is connected with a negative electrode of the motor and one end of the resistor R3.
In the embodiment, the voltage stabilization control circuit is a 3.3V voltage stabilization control circuit, the load is a motor M1, and the signal adopted by the single chip microcomputer MCU is HT66F0195-24 PIN.
Specifically, the MOSFET detection circuit includes a transistor Q1, a transistor Q2, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a capacitor C1; an emitter of the triode Q1 is connected with the voltage-stabilizing control circuit, one end of a resistor R2 is connected with an emitter of the triode Q1, the other end of the resistor R2 is connected with a base of the triode Q1, a capacitor C1 is connected to two ends of a resistor R2 in parallel, one end of a resistor R3 is connected with a negative electrode of a load, the other end of the resistor R3 is connected with a base of the triode Q1, one end of the resistor R4 is connected with a collector of the triode Q1, the other end of the resistor R4 is connected with a base of the triode Q2, one end of the resistor R5 is connected with a base of the triode Q2, and the other end of the resistor R5 is connected with GND; the emitting electrode of the triode Q2 is connected with GND, and the collecting electrode of the triode Q2 is connected with the voltage-stabilizing control circuit. The fuse comprises a first connecting end, a second connecting end and a third connecting end; the first connecting end is connected with the anode of the load, the second connecting end is connected with the MCU, and the third connecting end is connected with the battery.
The specific working principle is as follows: under normal conditions, the voltage of the drain electrode of the MOSFET is high level, the triode Q1 is not conducted, the triode Q2 is not conducted, and the collector electrode of the Q2 is pulled to be high level; when the drain and the source of the MOSFET are broken down and short-circuited, a load (a motor M1) works, the M-end of the motor is pulled to GND, the voltage at one end of a resistor R3 is connected to the GND, the BAT + voltage of the battery is divided through the resistor R2 and the resistor R3 to enable a triode Q1 to be conducted, the BAT + voltage passes through a triode Q1 and is divided through a resistor R4 and a resistor R5 to enable a triode Q2 to be conducted, the collector (C pole) of a triode Q2 is pulled down to the GND, a 3.3V voltage-stabilizing control circuit is triggered at the moment to wake up a single MCU singlechip, the current on the R1 resistor is continuously detected, the MCU singlechip drives a fuse to be blown, and therefore the motor stops working and the safety of the battery and.
The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.
Claims (7)
1. A MOSFET short circuit detection circuit is characterized by comprising a MOSFET, a MOSFET detection circuit, a single chip microcomputer MCU, a battery management chip, a voltage stabilization control circuit, a fuse and a load; the voltage stabilization control circuit is used for providing voltage for the battery management chip, the battery management chip is used for collecting voltage, current and temperature data of each battery and transmitting the data to the single chip microcomputer MCU, the MOSFET detection circuit is used for detecting whether the MOSFET is in short circuit or not and sending a short circuit signal to the single chip microcomputer MCU, the single chip microcomputer MCU is used for controlling the charging and discharging MOSFET and controlling fuse fusing when the MOSFET is in short circuit, and load current is cut off.
2. The MOSFET short-circuit detection circuit of claim 1, wherein the MOSFET detection circuit comprises a transistor Q1, a transistor Q2, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a capacitor C1; an emitter of the triode Q1 is connected with the voltage regulation control circuit, one end of the resistor R2 is connected with an emitter of the triode Q1, the other end of the resistor R2 is connected with a base of the triode Q1, the capacitor C1 is connected in parallel with two ends of the resistor R2, one end of the resistor R3 is connected with a negative electrode of a load, the other end of the resistor R3 is connected with a base of the triode Q1, one end of the resistor R4 is connected with a collector of the triode Q1, the other end of the resistor R4 is connected with a base of the triode Q2, one end of the resistor R5 is connected with a base of the triode Q2, and the other end of the resistor R5 is connected with GND; the emitting electrode of the triode Q2 is connected with GND, and the collecting electrode of the triode Q2 is connected with the voltage-stabilizing control circuit.
3. The MOSFET short circuit detection circuit of claim 1, wherein the regulated control circuit is a 3.3V regulated control circuit.
4. A MOSFET short circuit detection circuit as claimed in claim 1 wherein the fuse comprises a first connection terminal, a second connection terminal and a third connection terminal; the first connecting end is connected with the anode of the load, the second connecting end is connected with the MCU, and the third connecting end is connected with the battery.
5. A MOSFET short circuit detection circuit as claimed in claim 4, wherein the load is a motor.
6. A MOSFET short circuit detection circuit as claimed in claim 5, further comprising a low voltage drive circuit; the single chip microcomputer MCU is connected with the low-voltage driving circuit, the low-voltage driving circuit is connected with the grid electrode of the MOSFET, and the drain electrode of the MOSFET is connected with the negative electrode of the motor and one end of the resistor R3.
7. The MOSFET short-circuit detection circuit of claim 1, wherein the signal adopted by the MCU is HT66F0195-24 PIN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023197949.5U CN214041700U (en) | 2020-12-25 | 2020-12-25 | MOSFET short circuit detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023197949.5U CN214041700U (en) | 2020-12-25 | 2020-12-25 | MOSFET short circuit detection circuit |
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| CN214041700U true CN214041700U (en) | 2021-08-24 |
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| CN202023197949.5U Active CN214041700U (en) | 2020-12-25 | 2020-12-25 | MOSFET short circuit detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115133626A (en) * | 2022-08-09 | 2022-09-30 | 湖北亿纬动力有限公司 | Battery protection circuit, control method thereof and battery management system |
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2020
- 2020-12-25 CN CN202023197949.5U patent/CN214041700U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115133626A (en) * | 2022-08-09 | 2022-09-30 | 湖北亿纬动力有限公司 | Battery protection circuit, control method thereof and battery management system |
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