CN107800168B - Battery protection circuit and cordless electric tool - Google Patents
Battery protection circuit and cordless electric tool Download PDFInfo
- Publication number
- CN107800168B CN107800168B CN201711081719.2A CN201711081719A CN107800168B CN 107800168 B CN107800168 B CN 107800168B CN 201711081719 A CN201711081719 A CN 201711081719A CN 107800168 B CN107800168 B CN 107800168B
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Classifications
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- H02J7/0026—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a battery protection circuit and a cordless electric tool, wherein the protection circuit comprises a protection chip, a microcontroller and a reset sub-circuit, the protection chip is respectively connected with the microcontroller and the reset sub-circuit through data lines, and the microcontroller is connected with the reset sub-circuit through the data lines; the microcontroller controls the reset sub-circuit to execute a reset action when the chip enters an abnormal high-power locking state. According to the protection circuit provided by the invention, the micro control unit can judge whether the chip is in a dead state according to the state of the chip, and the reset circuit discharges the chip so as to finish the restarting process.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a battery protection circuit and a cordless electric tool.
Background
The special battery protection chip OZ9350/OZ9355 commonly used in the market at present supports overvoltage and undervoltage protection of 4-7/4-14 serial batteries, integrates a MOS driving module, and has the advantages that the built-in communication module can communicate with an external micro control module MCU, and the like, and is deeply favored by research and development personnel of international mainstream battery product manufacturers. However, the protection chip has no self-resetting function, once the chip is subjected to external strong signal interference such as static electricity, strong electromagnetic and the like, the chip easily enters an abnormal high-power-consumption locking mode, the power consumption of the chip in the mode can be obviously increased, the battery electric quantity can be rapidly consumed, and the whole battery is scrapped because the electric quantity is discharged. In order to solve the above-described problems, the inventors have proposed the following.
Disclosure of Invention
Therefore, an object of the present invention is to provide a protection circuit and a cordless power tool for protecting a battery from being scrapped due to overdischarge.
In order to solve the problems, the invention provides a battery protection circuit, which comprises a protection chip, a microcontroller and a reset sub-circuit, wherein the protection chip is respectively connected with the microcontroller and the reset sub-circuit through data lines, and the microcontroller is connected with the reset sub-circuit through the data lines;
the microcontroller controls the reset sub-circuit to execute a reset action when the chip enters an abnormal high-power locking state.
The protection chip is provided with a single battery detection input port, a power interface and a data interface, and the microcontroller is provided with a first data interface and a second data interface;
the reset sub-circuit is respectively connected with the data interface and the first data interface of the micro controller through data lines, and the power interface is connected with the first resistor of the reset sub-circuit.
The protection chip is used for receiving a battery voltage signal through the single battery detection input port, calculating the detected battery voltage signal and sending the calculated battery voltage signal to the microcontroller;
the microcontroller is used for receiving the battery voltage signal after operation, judging whether the protection chip enters an abnormal high-power locking mode according to the battery voltage signal after operation, and sending a reset signal to the reset sub-circuit when the protection chip enters the abnormal high-power locking mode;
the reset sub-circuit is used for executing a reset action when receiving a reset signal.
The reset sub-circuit comprises a first resistor, a second resistor, a third resistor and a first triode;
the first triode comprises a first electrode, a second electrode and a third electrode, wherein the third electrode is grounded;
the first resistor is arranged between the power interface of the protection chip and the first electrode;
the second resistor is arranged between a second data interface and a second electrode of the microcontroller;
the third resistor is arranged between the second electrode and the ground wire;
when the first triode receives the reset signal, the second electrode and the third electrode are conducted, so that the protection chip releases voltage through a power interface.
The first triode is an N-type triode, the first electrode is a collector, the second electrode is a base, and the third electrode is an emitter.
Wherein the second data interface is an I/O interface.
In order to solve the above problems, the present invention also provides a cordless power tool, which includes a battery and the above battery protection circuit.
The invention has the following beneficial effects:
the anti-interference capability of the protection chip to static electricity, strong electromagnetism and the like is improved; unlocking the accidental entering into the strong consumption dead halt state, and avoiding the scrapping of the battery due to overdischarge.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a circuit diagram of the present invention;
reference numerals:
1 a protection chip, 11 a single battery detection input port, 12 a data interface, 13 a power interface, 21 a first data interface and 22 a second data interface;
2 a microcontroller;
3 reset sub-circuit, 31 first resistor, 32 second resistor, 33 third resistor, 34 first transistor, 341 first electrode, 342 second electrode, 343 third electrode.
Detailed Description
The present invention will be described in more detail by way of specific examples, but the scope of the present invention is not limited to the examples.
As shown in fig. 1, an embodiment of a battery protection circuit according to the present invention is shown, in which the protection circuit includes a protection chip 1, a microcontroller 2, and a reset sub-circuit 3, the protection chip 1 is connected to the microcontroller 2 and the reset sub-circuit 3 through data lines, respectively, and the microcontroller 2 and the reset sub-circuit 3 are connected through data lines;
the microcontroller 2 controls the reset sub-circuit 3 to perform a reset action when the chip enters an abnormally high power locked state, thereby avoiding the battery from being scrapped due to overdischarge.
Optionally, the protection chip 1 is provided with a single battery detection input port 11, a power interface 13 and a data interface 12, and the microcontroller 2 is provided with a first data interface 21 and a second data interface 22;
the reset sub-circuit 3 is connected to the power interface 13 and the second data interface 22 via data lines, respectively.
During operation, the protection chip 1 receives a battery voltage signal through the single battery detection input port 11, calculates the detected battery voltage signal, and sends the calculated battery voltage signal to the microcontroller 2; the microcontroller 2 receives the calculated battery voltage signal, judges whether the protection chip 1 enters an abnormal high-power locking mode according to the calculated battery voltage signal, and sends a reset signal to the reset sub-circuit 3 when the protection chip 1 enters the abnormal high-power locking mode; the reset sub-circuit 3 performs a reset action upon receiving a reset signal.
Specifically, the reset sub-circuit 3 includes a first resistor 31, a second resistor 32, a third resistor 33, and a first triode 34; the first triode 34 comprises a first electrode 341, a second electrode 342 and a third electrode 343, wherein the third electrode 343 is grounded, and the first resistor 31 is arranged between the power interface 13 of the protection chip 1 and the first electrode 341;
the second resistor 32 is arranged between the second data interface 22 of the microcontroller 2 and the second electrode 342;
the third resistor 33 is disposed between the second electrode 342 and the ground line;
when receiving the reset signal, the first transistor 34 turns on the second electrode 342 and the third electrode 343, so that the protection chip 1 releases voltage through the power interface 13.
Optionally, the first transistor 34 is an N-type transistor, the first electrode 341 is a collector, the second electrode 342 is a base, the third electrode 343 is an emitter, and the second data interface 22 is an I/O interface.
In conjunction with fig. 1 of the specification, a specific application scenario of the embodiment is provided: the protection circuit comprises a chip U1 and a micro control unit U2; the chip is OZ9350 or OZ9355, the OZ9350 having 7 single battery input ports (b1+, b2+ …, b7+), the OZ9355 having 14 single battery input ports (b1+, b2+ …, b14+); a data line SDA, a clock signal line SCL, a wake-up data line WKUP and a battery voltage data line VAO are connected between the chip U1 and the micro control unit U2; the circuit is characterized in that a 14 pin (OZ 9350) or a 20 pin (OZ 9355) of the chip is connected with a reset circuit, the reset circuit comprises resistors R1, R2 and R3 and an NPN triode Q1, the resistor R1 is connected in series between the 14 pin or the 20 pin of the chip and a collector electrode of the triode Q1, the resistor R3 is connected in series between an emitter electrode and a base electrode of the triode Q1, the resistor R2 is connected in series between an I/O interface of the micro control unit and the base electrode, and the emitter electrode is grounded.
In the working process of the invention, the detected battery voltage is transmitted to the micro control unit U2 through the battery voltage data line VAO after the chip OZ9350/OZ9355 is operated, when the micro control unit detects that the highest power saving voltage B7 (OZ 9350) or B14 (OZ 9355) has larger phase difference with other power saving voltages, the micro control unit judges that the chip enters an abnormal high power consumption locking mode, and at the moment of shutdown, the micro control unit sends a reset instruction to briefly pull up an I/O port, opens a triode Q1 in an external reset circuit to discharge the 14 pin (OZ 9350) or the 20 pin (OZ 9355) of the chip through a resistor R1, so that the core voltage of the chip is released to enter an under-voltage state, the core voltage of the chip is restored to a normal value after the reset is finished, at the moment, all modules in the chip are reset, and the chip can be separated from the abnormal high power consumption locking mode to restore the normal work.
The invention also provides an embodiment of a cordless power tool comprising a battery and a battery protection circuit as mentioned in any one of the embodiments of the battery protection circuit.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (5)
1. A battery protection circuit, which comprises a protection chip and a microcontroller, and is characterized in that,
the protection chip is respectively connected with the microcontroller and the reset sub-circuit through data lines, and the microcontroller and the reset sub-circuit are connected through the data lines;
the microcontroller controls the reset sub-circuit to execute reset action when the chip enters an abnormal high-power locking state;
the protection chip is provided with a single battery detection input port, a power interface and a data interface, and the microcontroller is provided with a first data interface and a second data interface;
the reset sub-circuit is respectively connected with the power interface and the second data interface through data lines, the data interface is connected with the first data interface of the microcontroller, and the power interface is connected with the first resistor of the reset sub-circuit;
the protection chip is used for receiving a battery voltage signal through the single battery detection input port, calculating the detected battery voltage signal and sending the calculated battery voltage signal to the microcontroller;
the microcontroller is used for receiving the battery voltage signal after operation, judging whether the protection chip enters an abnormal high-power locking mode according to the battery voltage signal after operation, sending a reset signal to the reset sub-circuit when the protection chip enters the abnormal high-power locking mode, and briefly pulling up a second data interface;
the reset sub-circuit is used for executing a reset action when receiving a reset signal; when the reset action is executed, the reset sub-circuit enables the protection chip to discharge through the first resistor, so that the core voltage of the protection chip is discharged to enter an under-voltage state and enter a reset state, after the reset is finished, the core voltage of the protection chip is restored to a normal value, the protection chip is powered on for reset, all modules in the protection chip are reinitialized, and the protection chip is separated from an abnormal high-power-consumption locking mode to restore normal operation.
2. The battery protection circuit of claim 1, wherein:
the reset sub-circuit comprises a first resistor, a second resistor, a third resistor and a first triode;
the first triode comprises a first electrode, a second electrode and a third electrode, wherein the third electrode is grounded;
the first resistor is arranged between the power interface of the protection chip and the first electrode;
the second resistor is arranged between a second data interface and a second electrode of the microcontroller;
the third resistor is arranged between the second electrode and the ground wire;
when the first triode receives the reset signal, the second electrode and the third electrode are conducted, so that the protection chip releases voltage through a power interface.
3. The battery protection circuit of claim 2, wherein:
the first triode is an N-type triode, the first electrode is a collector, the second electrode is a base, and the third electrode is an emitter.
4. The battery protection circuit of claim 1, wherein:
the second data interface is an I/O interface.
5. A cordless power tool, characterized in that,
comprising a battery and a battery protection circuit as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711081719.2A CN107800168B (en) | 2017-11-07 | 2017-11-07 | Battery protection circuit and cordless electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711081719.2A CN107800168B (en) | 2017-11-07 | 2017-11-07 | Battery protection circuit and cordless electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107800168A CN107800168A (en) | 2018-03-13 |
| CN107800168B true CN107800168B (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711081719.2A Active CN107800168B (en) | 2017-11-07 | 2017-11-07 | Battery protection circuit and cordless electric tool |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2329035Y (en) * | 1997-08-06 | 1999-07-14 | 德州市科海遥控器总厂 | Automatic reset circuit for power supply |
| CN201887418U (en) * | 2010-06-30 | 2011-06-29 | 珠海中慧微电子有限公司 | Power supply management module of electric energy metering chip |
| CN202014087U (en) * | 2011-03-17 | 2011-10-19 | 上海韦尔半导体股份有限公司 | Lithium battery charging protection circuit for portable system |
| CN103474965A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Low-cost alternating-current input overvoltage protection circuit and switching power supply |
| CN105242766A (en) * | 2015-10-22 | 2016-01-13 | 深圳拓邦股份有限公司 | Voltage leap detection circuit, reset circuit and electronic device |
| CN107086639A (en) * | 2017-06-09 | 2017-08-22 | 上海裕芯电子科技有限公司 | The dead circuit of electric lock and method on a kind of elimination lithium battery protection circuit |
-
2017
- 2017-11-07 CN CN201711081719.2A patent/CN107800168B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2329035Y (en) * | 1997-08-06 | 1999-07-14 | 德州市科海遥控器总厂 | Automatic reset circuit for power supply |
| CN201887418U (en) * | 2010-06-30 | 2011-06-29 | 珠海中慧微电子有限公司 | Power supply management module of electric energy metering chip |
| CN202014087U (en) * | 2011-03-17 | 2011-10-19 | 上海韦尔半导体股份有限公司 | Lithium battery charging protection circuit for portable system |
| CN103474965A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Low-cost alternating-current input overvoltage protection circuit and switching power supply |
| CN105242766A (en) * | 2015-10-22 | 2016-01-13 | 深圳拓邦股份有限公司 | Voltage leap detection circuit, reset circuit and electronic device |
| CN107086639A (en) * | 2017-06-09 | 2017-08-22 | 上海裕芯电子科技有限公司 | The dead circuit of electric lock and method on a kind of elimination lithium battery protection circuit |
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| Publication number | Publication date |
|---|---|
| CN107800168A (en) | 2018-03-13 |
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