CN201812899U - Circuit for preventing over-high temperature during battery charging and battery thereof - Google Patents
Circuit for preventing over-high temperature during battery charging and battery thereof Download PDFInfo
- Publication number
- CN201812899U CN201812899U CN2010202875471U CN201020287547U CN201812899U CN 201812899 U CN201812899 U CN 201812899U CN 2010202875471 U CN2010202875471 U CN 2010202875471U CN 201020287547 U CN201020287547 U CN 201020287547U CN 201812899 U CN201812899 U CN 201812899U
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- battery
- thermistor
- temperature
- effect transistor
- field effect
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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
Abstract
The utility model discloses a circuit for preventing over-high temperature during battery charging and a battery adopting the circuit. The design principle is as follows: a thermistor is utilized to detect the temperature of the battery; in the normal state, the temperature detected by the thermistor is in the normal range, a switching tube is switched on to normally charge the battery; and if the temperature detected by the thermistor is too high, as the resistance of the negative temperature coefficient thermistor is reduced at high temperature, the switching tube is switched off through the voltage drop generated on the negative temperature coefficient thermistor, so as to rapidly cut off the charging path and thus achieve the overheat protection of the battery. The circuit can rapidly cut off the charging path to achieve the protection against overheat of the battery.
Description
Technical field
The utility model relates to a kind of battery overheat protecting circuit, in particular a kind of too high circuit of temperature when preventing battery charge.
Background technology
At present, increasing portable equipment all uses powered battery on the market, because of the restriction of battery electric quantity, needs often to battery charge.Because of battery in charging process, the temperature of battery can progressively raise, and when battery temperature is too high, will not produced the damage battery if do not control, or damage equipment, the serious danger of blasting.
Therefore, prior art has yet to be improved and developed.
The utility model content
The purpose of this utility model is to provide a kind of too high circuit of temperature when preventing battery charge, be intended to solve existing rechargeable battery in charging process, the temperature of battery can progressively raise, and when battery temperature is too high, will not produced dangerous problem if do not control.
The technical solution of the utility model is as follows:
A kind of too high circuit of temperature when preventing battery charge wherein, comprises thermistor, first triode and first field effect transistor, and an end of described thermistor connects the base stage of first triode, other end ground connection; The collector electrode of described first triode connects the grid of first field effect transistor; The source electrode of described first field effect transistor and drain electrode are connected on the charge path; The base stage of described first triode connects first resistance and second resistance, and first resistance connects charging input end, second grounding through resistance; The grid of described first field effect transistor connects the 3rd resistance, and the input of the 3rd resistance connects charging input end.
The described too high circuit of temperature when preventing battery charge, wherein, described thermistor and battery are pressed close to be provided with.
The described too high circuit of temperature when preventing battery charge, wherein, described thermistor is arranged on inside battery, and described battery is drawn an electrode, and an end of described electrode connects thermistor, and the other end touches the base stage of first triode.
The described too high circuit of temperature when preventing battery charge, wherein, described thermistor is a negative tempperature coefficient thermistor.
The described too high circuit of temperature when preventing battery charge, wherein, described first field effect transistor is a P type field effect transistor.
A kind of battery wherein, is provided with described thermistor in the described battery, and described battery is drawn an electrode, the end connection thermistor of described electrode, described thermistor other end ground connection.
The beneficial effects of the utility model: the utility model detects battery temperature by utilizing thermistor; when if battery temperature is too high; described thermistor can realize disconnecting fast charge path by ON-OFF control circuit, thereby reaches the protection that prevents that battery is overheated.
Description of drawings
Fig. 1 be the utility model embodiment provide prevent battery charge the time temperature too high circuit diagram.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
A kind of too high method of temperature when preventing battery charge that the utility model embodiment provides, its specific design principle is: utilize thermistor to detect the temperature of battery, under normal condition, the thermistor detected temperatures is in normal range (NR), the switching tube conducting charges normal battery; If to detect temperature too high for thermistor, lower according to negative tempperature coefficient thermistor resistance value when temperature is higher, thereby the voltage that produces in the above descends and comes on-off switching tube, disconnects charge path fast, has realized battery overheat protecting.
Referring to Fig. 1, present embodiment provides thermistor R4 and is arranged on inside battery, described when preventing battery charge the too high circuit of temperature comprise thermistor R4, the first triode Q1 and the first field effect transistor Q2, the end of described thermistor R4 connects the base stage of the first triode Q1, other end ground connection; The collector electrode of the described first triode Q1 connects the grid of the first field effect transistor Q2; The source electrode of the described first field effect transistor Q2 and drain electrode are connected on the charge path; The base stage of the described first triode Q1 connects first resistance R 1 and second resistance R, 2, the first resistance R 1 connect charging input end VCHG, second resistance R, 2 ground connection; The input that the grid of the described first field effect transistor Q2 connects the 3rd resistance R 3, the three resistance R 3 connects charging input end VCHG.
Described thermistor R4 can be placed in the battery and also can not be placed in the battery, and when being placed on outside batteries, described thermistor R4 needs to press close to be provided with battery, thereby guarantees the effect of thermistor R4.If be placed in the battery, the temperature detection effect can be more accurate.When described thermistor R4 is arranged on inside battery, need to draw an electrode on described battery, this electrode one end connects thermistor R4, and the other end touches the base stage of the first triode Q1.Described thermistor R4 is negative tempperature coefficient thermistor R4.
Described when preventing battery charge the operation principle of the too high circuit of temperature as follows:
As can be known from Fig. 1, the voltage on the thermistor R4 is VR, and its value is:
Wherein, VCHG is the direct voltage of charging input end.
In the charging process, the temperature of battery is in normal range (NR) the time, VR greater than the first triode Q1 to conducting voltage VBE, the first triode Q1 conducting, the then first field effect transistor Q2 conducting, battery charges normal.When battery temperature raises because thermistor R4 be the thermistor R4 of negative temperature coefficient; so R4 reduces; from formula (1) as can be known; VR also reduces, when battery temperature continuation rising, when VR is reduced to less than the conducting voltage VBE of the first triode Q1; the first triode Q1 turn-offs; then the first field effect transistor Q2 turn-offs, thereby has disconnected charge path, effectively protects battery overheated.
The first triode Q1 conducting, then the grid of the first field effect transistor Q2 (the G utmost point) voltage is low level 0V, thus the source electrode of the first field effect transistor Q2 (the S utmost point) voltage VCHG satisfies the turn-on condition of PMOS pipe greater than grid voltage, the first field effect transistor Q2 conducting.
When the first triode Q1 turn-offs; then the grid of the first field effect transistor Q2 (the G utmost point) voltage is VCHG; and source electrode (the S utmost point) voltage VCHG equals grid voltage; do not satisfy the turn-on condition of PMOS pipe; the first field effect transistor Q2 turn-offs; thereby no longer charge the battery, battery temperature no longer rises, and has protected battery.
Present embodiment also provides a kind of battery, and described inside battery comprises a thermistor, when in battery thermistor being set, needs to draw an electrode on battery, and described electrode one end connects thermistor, and the other end touches the base stage of first triode.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (6)
1. the too high circuit of temperature when preventing battery charge is characterized in that comprise thermistor, first triode and first field effect transistor, an end of described thermistor connects the base stage of first triode, other end ground connection; The collector electrode of described first triode connects the grid of first field effect transistor; The source electrode of described first field effect transistor and drain electrode are connected on the charge path; The base stage of described first triode connects first resistance and second resistance, and first resistance connects charging input end, second grounding through resistance; The grid of described first field effect transistor connects the 3rd resistance, and the input of the 3rd resistance connects charging input end.
2. the too high circuit of temperature when preventing battery charge according to claim 1 is characterized in that described thermistor and battery are pressed close to be provided with.
3. the too high circuit of temperature when preventing battery charge according to claim 1, it is characterized in that described thermistor is arranged on inside battery, described battery is drawn an electrode, one end of described electrode connects thermistor, and the other end touches the base stage of first triode.
4. the too high circuit of temperature when preventing battery charge according to claim 1 is characterized in that described thermistor is a negative tempperature coefficient thermistor.
5. the too high circuit of temperature when preventing battery charge according to claim 1 is characterized in that described first field effect transistor is a P type field effect transistor.
6. a battery is characterized in that, is provided with thermistor in the described battery, and described battery is provided with an electrode, the end connection thermistor of described electrode, described thermistor other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202875471U CN201812899U (en) | 2010-08-05 | 2010-08-05 | Circuit for preventing over-high temperature during battery charging and battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202875471U CN201812899U (en) | 2010-08-05 | 2010-08-05 | Circuit for preventing over-high temperature during battery charging and battery thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201812899U true CN201812899U (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202875471U Expired - Fee Related CN201812899U (en) | 2010-08-05 | 2010-08-05 | Circuit for preventing over-high temperature during battery charging and battery thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN201812899U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917039A (en) * | 2010-08-05 | 2010-12-15 | 惠州Tcl移动通信有限公司 | Battery and method and circuit for preventing overhigh temperature during charging same |
| CN106532860A (en) * | 2016-12-28 | 2017-03-22 | 宇龙计算机通信科技(深圳)有限公司 | Charging circuit and electronic device provided with charging circuit |
| CN110571878A (en) * | 2019-08-09 | 2019-12-13 | 恒大智慧充电科技有限公司 | Over-temperature protection device, over-temperature protection method, computer device, and storage medium |
-
2010
- 2010-08-05 CN CN2010202875471U patent/CN201812899U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917039A (en) * | 2010-08-05 | 2010-12-15 | 惠州Tcl移动通信有限公司 | Battery and method and circuit for preventing overhigh temperature during charging same |
| CN101917039B (en) * | 2010-08-05 | 2014-04-16 | 惠州Tcl移动通信有限公司 | Battery and method and circuit for preventing overhigh temperature during charging same |
| CN106532860A (en) * | 2016-12-28 | 2017-03-22 | 宇龙计算机通信科技(深圳)有限公司 | Charging circuit and electronic device provided with charging circuit |
| CN110571878A (en) * | 2019-08-09 | 2019-12-13 | 恒大智慧充电科技有限公司 | Over-temperature protection device, over-temperature protection method, computer device, and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20130805 |