CN205231805U - Bluetooth keyboard lithium battery protection circuit - Google Patents
Bluetooth keyboard lithium battery protection circuit Download PDFInfo
- Publication number
- CN205231805U CN205231805U CN201521089637.9U CN201521089637U CN205231805U CN 205231805 U CN205231805 U CN 205231805U CN 201521089637 U CN201521089637 U CN 201521089637U CN 205231805 U CN205231805 U CN 205231805U
- Authority
- CN
- China
- Prior art keywords
- battery
- battery protection
- lithium battery
- semiconductor
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a bluetooth keyboard lithium battery protection circuit, a serial communication port, include: positive input terminal V+, negative pole input V -, lithium battery protection chip U1, battery positive electrode connecting end B+, battery negative -pole connecting terminal B -, temperature resistive port T, be used for the MOS pipe Q1 of discharge control and be used for the MOS pipe Q2 of charging control. Adopting special control chip, effectively carrying out filling, crossing the protection of putting, overflowing to the lithium cell, working sensitivity is high, major loop on -state resistance is low and internal loss is low, increase PTC and NTC in the protection circuit, troubles such as even once protect the way to become invalid or temperature rise when higher, thermistor still can fill crossing, overflow, short circuit, super temperature provide the protection, guarantee the battery under the condition by misuseing or abusing, unlikely emergence security problem.
Description
Technical field
The utility model relates to lithium battery technology, is specifically related to a kind of bluetooth keyboard lithium battery protection circuit.
Background technology
Bluetooth keyboard refers to and carries out wireless transmission by Bluetooth protocol, carries out the keyboard of bluetooth communication, do not have the constraint of connecting line in effective scope, can remote operation, easy to use.
Conventional Bluetooth keyboard uses No. 5 or No. 7 alkaline batteries, and because keyboard uses power consumption comparatively large, service time of battery only has about 1 month.Rechargeable lithium battary has the advantages such as power supply capacity is high, power quality is light, is applied in bluetooth keyboard, can reduces the use of alkaline battery, and environmental protection is practical more.But the cut-ff voltage of charged lithium cells is 1V, if used lower than 1V for a long time, discharging rechargeable battery can be caused excessively to shorten battery life and even to scrap.
Utility model content
In view of deficiency existing in above-mentioned prior art; the purpose of this utility model is to provide a kind of bluetooth keyboard lithium battery protection circuit; to the electric current of lithium battery, voltage and temperature in addition control and protection, the trouble free service of lithium battery can be ensured, extends the useful life of lithium battery.
For achieving the above object, the utility model will be achieved through the following technical solutions: bluetooth keyboard lithium battery protection circuit, it is characterized in that, comprise: electrode input end V+, negative input V-, Li battery protection IC U1, anode link B+, battery cathode link B-, temperature and resistance port T, for the metal-oxide-semiconductor Q1 of control of discharge with for the metal-oxide-semiconductor Q2 controlled that charges, anode link B+ is connected with electrode input end V+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input V-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q1, the CO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q1 is connected to cathode of lithium battery link B-, the drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q2 is connected to negative input V-, electric capacity C2 is provided with between described electrode input end V+ and negative input V-, described battery cathode link B-front end is provided with PTC resistance, described temperature and resistance port T is connected to negative input V-by NTC resistance.
As preferably, Li battery protection IC U1 is S-8241AAXMC-GAX-T2G.
As preferably, described MOS transistor Q1 and MOS transistor Q2 is integrated in a chip, and described chip is STG8810.
The utility model has the following advantages and beneficial effect compared to existing technology:
Bluetooth keyboard lithium battery protection circuit of the present utility model, adopt special integrated circuit, can effectively overcharge lithium battery, cross put, the protection of overcurrent, working sensitivity is high, major loop on state resistance is low and internal loss is low; Increase PTC and NTC in protective circuit, though once protect road to lose efficacy or temperature rise is higher time, thermistor still can to overcharging, overcurrent, short circuit, the fault such as overtemperature provide protection, ensures that battery is when being misapplied or abusing, unlikely generation safety issue.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model bluetooth keyboard lithium battery protection circuit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment as shown in Figure 1, bluetooth keyboard lithium battery protection circuit, it is characterized in that, comprise: electrode input end V+, negative input V-, Li battery protection IC U1, anode link B+, battery cathode link B-, temperature and resistance port T, for the metal-oxide-semiconductor Q1 of control of discharge with for the metal-oxide-semiconductor Q2 controlled that charges, anode link B+ is connected with electrode input end V+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input V-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q1, the CO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q1 is connected to cathode of lithium battery link B-, the drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q2 is connected to negative input V-, electric capacity C2 is provided with between described electrode input end V+ and negative input V-, described battery cathode link B-front end is provided with PTC resistance, described temperature and resistance port T is connected to negative input V-by NTC resistance.
As preferably, Li battery protection IC U1 is S-8241AAXMC-GAX-T2G.
As preferably, described MOS transistor Q1 and MOS transistor Q2 is integrated in a chip, and described chip is STG8810.
Positive source, power cathode, discharge prevention actuating station, charge protection actuating station that pin VDD, VSS, DO, CO of Li battery protection IC U1 are respectively; single lithium battery is connected between B+ and B-; lithium battery is from realizing charging input and electric discharge output between electrode input end V+ and negative input V –; during charging; charger output voltage is connected between V+ and V-; B+ and B-of electric current from V+ to cell, then through control of discharge chip U2 to V-.In charging process, VDD and the VSS pin of Li battery protection IC U1 detects lithium battery voltage by R1, when the voltage of single lithium battery is more than 4.28V, the CO pin output signal of Li battery protection IC U1 makes MOS transistor Q2 turn off, lithium battery stops charging immediately, thus prevents lithium battery from damaging because of overcharge; In discharge process, VDD and the VSS pin of Li battery protection IC U1 detects lithium battery voltage by R1, when the voltage of single lithium battery drops to 2.80V, the DO pin output signal of Li battery protection IC U1 makes MOS transistor Q1 turn off, lithium battery stops electric discharge immediately, thus prevents lithium battery from damaging because of overdischarge; The V-pin of Li battery protection IC U1 is current detecting pin; V-and VSS pin detects the voltage at MOS transistor Q1 two ends by resistance R2; during output short-circuit; the conduction voltage drop of MOS transistor Q1 increases severely; V-pin voltage raises rapidly; the DO pin output signal of Li battery protection IC U1 makes MOS transistor Q1 turn off rapidly, thus realizes overcurrent or short-circuit protection.
Set temperature resistance port T, connects temperature and resistance PTC and NTC, when battery operated, does not have to overcharge, cross and put or the situation such as overcurrent, short circuit, but due to the operating time oversize, cause battery core temperature to rise very fast.Along with the increase of electric current, PTC temperature sharply rises, and PTC internal resistance sharply increases, to PTC internal resistance infinity then circuit breaker, now reach overcurrent protection state, after temperature lowers, then internal resistance also reduces thereupon, and PTC returns to normal condition, and circuit again can conducting; And NTC resistance is close to battery core monitoring battery core temperature, along with temperature rising NTC resistance declines gradually, when resistance drops to control processor set point; namely control processor sends shutdown command; battery is allowed to stop, to its power supply, only maintaining very little standby current, reaching the object of protection battery.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (3)
1. bluetooth keyboard lithium battery protection circuit, it is characterized in that, comprise: electrode input end V+, negative input V-, Li battery protection IC U1, anode link B+, battery cathode link B-, temperature and resistance port T, for the metal-oxide-semiconductor Q1 of control of discharge with for the metal-oxide-semiconductor Q2 controlled that charges, anode link B+ is connected with electrode input end V+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input V-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q1, the CO pin of Li battery protection IC U1 is connected with the grid of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q1 is connected to cathode of lithium battery link B-, the drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q2 is connected to negative input V-, electric capacity C2 is provided with between described electrode input end V+ and negative input V-, described battery cathode link B-front end is provided with PTC resistance, described temperature and resistance port T is connected to negative input V-by NTC resistance.
2. bluetooth keyboard lithium battery protection circuit according to claim 1, is characterized in that: Li battery protection IC U1 is S-8241AAXMC-GAX-T2G.
3. bluetooth keyboard lithium battery protection circuit according to claim 1, is characterized in that: described MOS transistor Q1 and MOS transistor Q2 is integrated in a chip, and described chip is STG8810.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521089637.9U CN205231805U (en) | 2015-12-24 | 2015-12-24 | Bluetooth keyboard lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521089637.9U CN205231805U (en) | 2015-12-24 | 2015-12-24 | Bluetooth keyboard lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205231805U true CN205231805U (en) | 2016-05-11 |
Family
ID=55906850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521089637.9U Expired - Fee Related CN205231805U (en) | 2015-12-24 | 2015-12-24 | Bluetooth keyboard lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205231805U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684829A (en) * | 2017-03-17 | 2017-05-17 | 捷开通讯(深圳)有限公司 | Battery protection circuit based on electronic device motherboard and electronic device |
| CN107425508A (en) * | 2017-08-14 | 2017-12-01 | 惠州市德赛电池有限公司 | A kind of multiple current foldback circuit of battery |
| CN107819322A (en) * | 2017-12-14 | 2018-03-20 | 惠州市盛微电子有限公司 | A kind of lithium battery protection circuit applied to intelligent watch |
| CN110932365A (en) * | 2019-12-27 | 2020-03-27 | 博科能源系统(深圳)有限公司 | Battery protection circuit |
| CN115172912A (en) * | 2022-09-07 | 2022-10-11 | 禹创半导体(深圳)有限公司 | Method for prolonging standby time of battery by battery protection chip |
-
2015
- 2015-12-24 CN CN201521089637.9U patent/CN205231805U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684829A (en) * | 2017-03-17 | 2017-05-17 | 捷开通讯(深圳)有限公司 | Battery protection circuit based on electronic device motherboard and electronic device |
| CN107425508A (en) * | 2017-08-14 | 2017-12-01 | 惠州市德赛电池有限公司 | A kind of multiple current foldback circuit of battery |
| CN107819322A (en) * | 2017-12-14 | 2018-03-20 | 惠州市盛微电子有限公司 | A kind of lithium battery protection circuit applied to intelligent watch |
| CN110932365A (en) * | 2019-12-27 | 2020-03-27 | 博科能源系统(深圳)有限公司 | Battery protection circuit |
| CN115172912A (en) * | 2022-09-07 | 2022-10-11 | 禹创半导体(深圳)有限公司 | Method for prolonging standby time of battery by battery protection chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107231015B (en) | A kind of battery, terminal and charging system | |
| CN205231805U (en) | Bluetooth keyboard lithium battery protection circuit | |
| CN204258279U (en) | A kind of lithium battery low voltage protection circuit | |
| CN204967307U (en) | Battery measurement control circuit and battery measurement system | |
| CN102570403A (en) | Temperature protection circuit for lithium ion battery charging and discharging | |
| CN202014087U (en) | Lithium battery charging protection circuit for portable system | |
| CN201134461Y (en) | Disaster preventing protective device of protective plate of multi-series lithium ion cell | |
| CN203522160U (en) | Cell protection circuit having secondary overvoltage/under-voltage protection function | |
| CN205231808U (en) | Mobile phone lithium battery protection circuit | |
| WO2017219359A1 (en) | Multi-lug battery | |
| CN202678945U (en) | Waterproof protector of lithium battery | |
| CN205282574U (en) | Novel electric core structure of battery | |
| CN205195249U (en) | Digit BMS protection shield with data storage function | |
| CN204290423U (en) | Lithium battery charging circuit | |
| CN111181205A (en) | Parallel high-voltage control box of battery system | |
| CN203326662U (en) | Storage battery discharge undervoltage identification circuit | |
| CN201113506Y (en) | Circuit capable of charging low voltage batteries | |
| CN112838647B (en) | Lithium ion battery circuit with multiple protection functions | |
| CN105048606A (en) | Battery discharge protection circuit and rechargeable battery pack with discharge protection function | |
| CN109378800A (en) | A kind of band temperature controlled Li-ion battery protection board based on learning robot | |
| CN205231807U (en) | Bluetooth sound lithium battery protection circuit | |
| CN201562728U (en) | Switch type protective circuit for lithium batteries | |
| CN2857299Y (en) | Charging protective circuit of lithium cell | |
| CN210839032U (en) | GPS locator lithium battery charging and discharging protection circuit | |
| CN212137299U (en) | Parallel high-voltage control box of battery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181224 |