CN102244306B - Method for charging mobile phone under low temperature - Google Patents
Method for charging mobile phone under low temperature Download PDFInfo
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- CN102244306B CN102244306B CN2010102428769A CN201010242876A CN102244306B CN 102244306 B CN102244306 B CN 102244306B CN 2010102428769 A CN2010102428769 A CN 2010102428769A CN 201010242876 A CN201010242876 A CN 201010242876A CN 102244306 B CN102244306 B CN 102244306B
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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 invention discloses a method for charging a mobile phone under a low temperature. The method comprises the following steps: step S100, inserting a mobile phone charger; step S200, detecting whether a battery voltage is lower than 2.9V, executing step S300 if the battery voltage is lower than 2.9V, and executing step S500 if not; step S300, starting a pre-charging process; step S400, stopping the pre-charging process when a detected battery voltage reaches 3.2V; step S500, starting a power-on process; step S600, starting a charging circuit to provide the battery with a charging current pulse; step S700, detecting whether the battery voltage is higher than 2.9V when the power-on process is finished, executing step S800 if the battery voltage is higher than 2.9V, and executing step S300 if not; step S800, starting a constant heavy-current charging process. When a mobile phone battery is over-discharged, the battery can not be fully charged under a low-temperature. With the method provided by the invention, the problem can be solved.
Description
Technical field
The present invention relates to a kind of mobile phone charging method, in particular a kind of MTK platform mobile phone charging method under low temperature after the battery over-discharge can that solves.
Background technology
Some mobile phones in the market, when the electric weight after normal use in battery exhausts, perhaps because long-time idle rear battery consumes excessively, at this moment the slotting charger of user charges to mobile phone, just started a bit of time (different different with battery power consumption situation according to type of cell phone, this time also is not quite similar, a few minutes are not waited to dozens of minutes), mobile phone may be without any reaction (screen just can not show as common charged state that, in charged state, some mobile phone can additionally add an indicator light).It's a normal phenomenon, usually this process is called to the pre-charge process of mobile phone.This is that voltage is very low due to after the battery of mobile phone over-discharge can, can't meet the normal compressor start up condition of mobile phone, and after a bit of time of charging, after cell voltage rises to certain value, mobile phone has just normally been opened.
For the mobile phone of MTK platform, after the battery over-discharge can, if detecting cell voltage, mobile phone is less than 2.9V, handset starting pre-charge process after slotting charger.In order to improve the fail safe of charging under the battery low-pressure state, the electric current (500mA or higher) during the electric current of this pre-charge process (approximately within 100mA) compared with normal charging is little a lot.After cell voltage reaches compressor start up condition (battery reaches 3.2V), pre-charge process stops, and handset starting start flow process is opened normal large electric current constant current charge process again after the start flow process completes.Be transformed into from precharge at mobile phone between large electric current constant current charge, due to the mobile phone operation of flow process of will being started shooting, thereby do not remove to operate charging circuit, so just exist an of short duration time interval (about 1～3 second) mobile phone to suspend charging.Now cell voltage can descend naturally.Because this time is very short, usually generally can not bring any problem under normal temperature, but when mobile phone is that (such as ambient temperature only has the Cold Winter in several years) at low temperatures is while being charged, because the activity of battery under low temperature is low and internal driving is larger, within this 1～3 second time that stops charging, cell voltage descends very fast.If cell voltage drops to again below 2.9V, mobile phone does not also have enough time to open large electric current constant current charge process, has just entered into pre-charge process again, and while waiting cell voltage to reach 3.2V, mobile phone stops charging 1～2 second.So circulation, charging process is just switched always between these two states like this, and mobile phone fills the insatiable hunger electricity forever.
Referring to Fig. 1, for the mobile phone of MTK platform, after transition electric discharge, the electric current 11 below 0 degree during charging and the change curve of voltage 12 can find out, in pre-charge process, cell voltage rises to 3.2V gradually.After pre-charge process finishes, in the process of opening in the start flow process, cell voltage slowly descends from 3.2V.After the start flow process finishes, the voltage of battery has below the 2.9V of dropping to, so must restart pre-charge process.So the voltage of battery is conversion repeatedly between 3.2V and 2.9V, do not continue to raise.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide the mobile phone charging method under a kind of low temperature, after being intended to solve existing mobile phone transition electric discharge, under low temperature environment, charging can not be filled full problem.
Technical scheme of the present invention is as follows:
Mobile phone charging method under a kind of low temperature, it comprises the following steps:
Step S100: insert charger for mobile phone;
Step S200: detecting cell voltage and whether be less than 2.9V, is to perform step S300, otherwise execution step S500;
Step S300: open pre-charge process;
Step S400: when the detection cell voltage reaches 3.2V, stop pre-charge process;
Step S500: open the start flow process;
Step S600: open charging circuit, give charging current pulse of battery;
Step S700: after the start flow process completes, whether the detection cell voltage is greater than 2.9V, if perform step S800:, otherwise execution step S300;
Step S800: open large electric current constant current charge.
Mobile phone charging method under described low temperature, wherein, in step S600, open charging circuit by software interrupt.
Mobile phone charging method under described low temperature, wherein, the time that described charging circuit is opened is 0.2 second.
Beneficial effect of the present invention: the present invention is by after finishing in precharge, insert an of short duration heavy current pulse process between the start flow process, open charging circuit to charging current pulse of battery, make cell voltage increase a bit, guarantee that the start flow process finishes the voltage of battery afterwards and remains on 2.9V, thereby normally open large electric current constant current charge process.
The accompanying drawing explanation
Fig. 1 is that the voltage and current of the mobile phone charging method of existing MTK platform while charging the battery under 0 degree changes schematic diagram;
Fig. 2 is the flow chart of charging method provided by the invention;
Fig. 3 is the electric current that adopts charging method provided by the invention to charge the battery under 0 degree and the variation schematic diagram of voltage.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.
Referring to Fig. 2, the concrete steps of this charging method are:
Step S100: insert charger for mobile phone.
Step S200: detecting cell voltage and whether be less than 2.9V, is to perform step S300, otherwise execution step S500.
Step S300: open pre-charge process.
Step S400: when the detection cell voltage reaches 3.2V, stop pre-charge process.
Step S500: open the start flow process.
Step S600: opened charging circuit before the start flow process finishes, give charging current pulse of battery.
Can be between the start flow process point sometime, generally can be arranged on the start flow process and start after 1 to 1.5 second core processor by mobile phone and provide a software interrupt to open the charge controlling chip of controlling mobile phone to open normal charging circuit.5 times of left and right of charging current when the charging current due to normal charging circuit after opening is precharge.If just directly do not open charging circuit before mobile phone is started shooting, the large electric current of its generation may destroy the circuit of mobile phone.Therefore, the time of described software interrupt unlatching charging circuit should be as far as possible short, generally can be made as 0.1-0.3 second, and the optimal selection of the present embodiment has 0.2 second.
Step S700: after the start flow process completes, whether the detection cell voltage is greater than 2.9V, if perform step S800, otherwise execution step S300.
Step S800: open large electric current constant current charge.
Referring to Fig. 3, be illustrated as the electric current that adopts charging method provided by the invention to charge the battery and the variation schematic diagram of voltage under 0 degree.
After in pre-charge process, cell voltage rises to 3.2V, mobile phone enter the start flow process now the charging circuit of mobile phone by the charge controlling chip of mobile phone, closed, battery start the electric discharge.There is very large internal resistance due to mobile phone below 0 degree, so the voltage drop in now internal resistance is very large, thereby be easy to cause the cell voltage of mobile phone after the start flow process finishes to drop under 2.9V again.Now mobile phone must restart pre-charge process and makes cell voltage reach 3.2V to restart the start flow process.Because only after mobile phone power-on, could start normal large electric current constant current charge process.
For avoiding mobile phone to circulate between pre-charge process and start flow process, in this enforcement in start after flow process carries out a period of time, generally in the start flow process, start the time of 1 to 1.5 second, heavy current pulse 33 to a short time of input in charging circuit, the described lasting time of heavy current pulse 33 was generally between 0.1 to 0.3 second, in the present embodiment, selected 0.2 second.After being subject to the effect of described heavy current pulse 33, battery can make cell voltage increase rapidly, general this heavy current pulse 33 can guarantee that cell voltage also remains on 2.9V after finishing the start flow process, guarantee that mobile phone can start shooting normally, thereby start normally the large current charge process.Mobile phone starts charging normally.
The advantage of the method: method simple practical.Only revise the software setting in mobile phone, do not need to increase hardware cost.Successful after importing the method in mobile phone, and the mobile phone precharge problem that same cause causes all is resolved.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (3)
1. the mobile phone charging method under a low temperature, it comprises the following steps:
Step S100: insert charger for mobile phone;
Step S200: detecting cell voltage and whether be less than 2.9V, is to perform step S300, otherwise execution step S500;
Step S300: open pre-charge process;
Step S400: when the detection cell voltage reaches 3.2V, stop pre-charge process;
Step S500: open the start flow process;
Step S600: open charging circuit, give charging current pulse of battery;
Step S700: after the start flow process completes, whether the detection cell voltage is greater than 2.9V, if perform step S800, otherwise execution step S300;
Step S800: open large electric current constant current charge.
2. the mobile phone charging method under low temperature according to claim 1, is characterized in that, in step S600, by software interrupt, opens charging circuit.
3. the mobile phone charging method under low temperature according to claim 2, is characterized in that, the time that described charging circuit is opened is 0.2 second.
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| CN2010102428769A CN102244306B (en) | 2010-07-30 | 2010-07-30 | Method for charging mobile phone under low temperature |
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| CN2010102428769A CN102244306B (en) | 2010-07-30 | 2010-07-30 | Method for charging mobile phone under low temperature |
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| CN102244306B true CN102244306B (en) | 2013-12-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104347896B (en) * | 2013-08-07 | 2020-02-14 | 荣盛盟固利新能源科技有限公司 | Method for improving service life of lithium ion battery in low-temperature environment |
| WO2015100623A1 (en) * | 2013-12-31 | 2015-07-09 | 华为终端有限公司 | Indication lamp control circuit and electronic device |
| CN106846636A (en) * | 2017-01-22 | 2017-06-13 | 畅新建 | Electric energy supply equipment, charging system and charging method |
| CN110890600B (en) * | 2019-09-24 | 2021-06-29 | 北京理工大学 | Charging method for 18650 type lithium ion battery in low-temperature environment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812220A (en) * | 2005-01-26 | 2006-08-02 | 乐金电子(中国)研究开发中心有限公司 | Mobile telephone battery charging controlling method and apparatus thereof |
| CN101039036A (en) * | 2006-03-15 | 2007-09-19 | 大唐移动通信设备有限公司 | Method and circuit for charging the overdischarging lithium battery by mobile terminal |
| CN101102054A (en) * | 2006-07-04 | 2008-01-09 | 坎培诺洛有限公司 | Method for controlling and system for charging a battery power supply unit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812220A (en) * | 2005-01-26 | 2006-08-02 | 乐金电子(中国)研究开发中心有限公司 | Mobile telephone battery charging controlling method and apparatus thereof |
| CN101039036A (en) * | 2006-03-15 | 2007-09-19 | 大唐移动通信设备有限公司 | Method and circuit for charging the overdischarging lithium battery by mobile terminal |
| CN101102054A (en) * | 2006-07-04 | 2008-01-09 | 坎培诺洛有限公司 | Method for controlling and system for charging a battery power supply unit |
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