CN1648921A - Device and method for prolonging electronic device data storage time - Google Patents

Device and method for prolonging electronic device data storage time Download PDF

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Publication number
CN1648921A
CN1648921A CN 200510009052 CN200510009052A CN1648921A CN 1648921 A CN1648921 A CN 1648921A CN 200510009052 CN200510009052 CN 200510009052 CN 200510009052 A CN200510009052 A CN 200510009052A CN 1648921 A CN1648921 A CN 1648921A
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battery
electronic installation
data
time
electric weight
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CN 200510009052
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Chinese (zh)
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陈南光
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E Ten Information Systems Co Ltd
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E Ten Information Systems Co Ltd
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Priority to CN 200510009052 priority Critical patent/CN1648921A/en
Publication of CN1648921A publication Critical patent/CN1648921A/en
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Abstract

The present invention relates to device and method for prolonging the data maintaining time in electronic equipment. The device includes cell, microprocessor, record medium, peripheral modules and measuring assembly. The method includes measuring the residual capacity of cell with the measuring assembly and transmitting to the microprocessor; calculating the residual cell work time for maintaining the data and setting the measurement time interval of the measuring assembly in the microprocessor; turning off the power supply to the peripheral modules while maintaining the power supply to the microprocessor, the record medium and the measuring assembly after the residual capacity is measured to be lower than the lowest amount for maintaining data; and restoring the power supply to the peripheral modules after the cell is measured to have been charged to be above the lowest amount.

Description

Prolong the device and method of electronic device data storage time
Technical field
The invention relates to a kind of portable electric device, refer in particular to a kind of prolongation electronic installation still can be preserved data time when battery extremely hangs down electric weight device and method that has.
Background technology
In recent years, various portable electronic products become the hot topic on the market, and individual accompanied electronic product miscellaneous, as personal digital assistant device (PDA), stock finance machine, digital camera, palmtop computer and intelligent mobile phone etc., in function and moulding, make every effort to invariably break through with perfect, and be that the user enjoys the facility that science and technology is brought.Yet, general personal digital aid (PDA) (PDA) and mobile phone portable electric devices such as (cell-phone) (hand-held device) etc. all are the electric power by the running of battery feedway, therefore, and these electronic installations, if do not have " " supply, also lack scope for their abilities.
Moreover, just at present general portable electric device all has two kinds of non-voltile memory and volatile memories, the former is as flash type internal memory (Flash Memory) etc. and in order to stocking system program, important application program and significant data, and the latter is representative and in order to store ephemeral data with random access memory (RAM) then; And because portable electric product mainly is based on battery electric power, when causing to reopen machine in case the user does not note running down of battery or other unusual condition, the former data that are stored in volatile memory will run off and can't restore, thereby cause greatly inconvenience of user.Especially with the personal set data instance; the user is at the beginning of using handheld electronic device; in the reasonable time of often must expending in the setting of its some use preferences; backlight intensity as the electronic installation display screen; to specific luminance and screen protection pattern; the setting of operating key and the type of incoming ring tone and volume or the like; or be when the user imports setting data; for example mobile phone news in brief or phone data are not imported as yet and are finished; promptly take place not cause above-mentioned each setting because of supplying cell has electricity; information is damaged and is run off; make the user to set and data by re-entering, it is complicated consuming time self-evident.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of device and method that prolongs electronic installation preservation data time that has.
For achieving the above object, the portable electric device of prolongation data holding time provided by the invention, it comprises:
One battery provides this electronic installation running required electric weight;
One microprocessor is in order to control this electronic installation running;
One recording medium is in order to store this battery related setting;
At least one peripheral module is in order to provide specific function of this electronic installation and running;
One measures assembly, in order to measure the dump energy of this battery; And
One managing electric quantity module, be stored in this recording medium, for this microprocessor load and execution, it measures this battery dump energy that obtains and cooperates the stored battery related setting value of this recording medium according to this measurement assembly, drop to minimum preservation data electric weight required time with this electric weight of computed range, and as this measurement assembly the interval time that measures this battery dump energy next time, when this battery dump energy value that records is lower than this minimum preservation data charge value, promptly close the supply electric weight of this peripheral module, to reduce the consumption of battery electric quantity.
Described portable electric device, wherein this peripheral module comprises one provides electronic installation and the extraneous wireless communication module that transmits message.
Described portable electric device, wherein this peripheral module comprises a satellite positioning module that this electronic installation satnav service function is provided.
Described portable electric device, wherein this peripheral module comprises a blue bud module that this electronic installation communication transfer function is provided.
Described portable electric device, wherein this peripheral module comprises a display module that this electronic installation Presentation Function is provided.
Described portable electric device, wherein this measurement assembly is an analog-digital converter.
Prolongation electronic installation provided by the invention is preserved the method for data time, and its step of this method comprises:
Measure the present charge value of this electronic device battery;
This charge value of computed range drops to the minimum required time of preservation data charge value, and is set at the interval time that measure battery electric quantity next time;
When arriving this setting-up time, measure the electric weight of this remaining battery;
Judge whether this electric weight has been lower than the electric weight of this minimum preservation data; If be, promptly close the supply electric weight of this peripheral module; Otherwise, repeat above-mentioned steps.
Described prolongation electronic installation is preserved the method for data time, wherein is according to the battery electric quantity value of this measurement and cooperates the battery related setting value computing gained that stores in this electronic installation this interval time.
Described prolongation electronic installation is preserved the method for data time, and wherein this setting value comprises: the unit interval power consumption (Xs) of estimating to preserve user's data time length (T), electronic installation.
Described prolongation electronic installation is preserved the method for data time, and wherein the step in the interval time of obtaining measurement next time battery electric quantity also comprises:
Ask for the minimum electric weight (Xa) that system preserves data, its calculating formula is:
System preserves the unit interval power consumption (Xs) of minimum electric weight (Xa)=expectation preservation user's data time length (T) * electronic installation of data;
Ask for still spendable electric weight (Xb), its calculating formula is:
Still spendable electric weight (Xb)=battery current battery charge value (Xc)-system preserves the minimum electric weight (Xa) of data;
Ask for length interval time (Ts) that measure battery electric quantity next time, its calculating formula is:
Measure the unit interval power consumption (Xs) of the spendable electric weight of length interval time (Ts)=still (Xb) formula/electronic installation of battery electric quantity next time.
The present invention discloses a kind of Storage Media in addition, store a program and supply an electronic installation load and execution, this electronic installation has a battery and at least one peripheral module that specific function and running are provided, and this program will make this electronic installation carry out following step after this electronic installation load and execution:
A, measure the battery dump energy value of this electronic installation;
B, cooperate the battery related setting value that stores in this electronic installation, obtaining the minimum battery electric quantity that this system preserves data, and calculate the still spendable at present electric weight of this battery;
C, ask for apart from this charge value and drop to minimum preservation data charge value required time, and be set at the interval of next measurement time;
D, when arriving this setting-up time, measure the charge value of this remaining battery;
E, judge whether this charge value has been lower than this minimum preservation data charge value; If be, promptly close the supply of current of peripheral module; Otherwise, get back to step a.
Described Storage Media, wherein this setting value comprises: the unit interval power consumption (Xs) of estimating to preserve user's data time length (T), electronic installation.
Described Storage Media is wherein asked for the minimum battery electric quantity value that this system preserves data, and its calculating formula is:
System preserves the unit interval power consumption (Xs) of minimum electric weight (Xa)=expectation preservation user's data time length (T) * electronic installation of data.
Described Storage Media is wherein asked for the still spendable at present charge value of this battery, and its calculating formula is:
Still spendable electric weight (Xb)=battery current battery charge value (Xc)-system preserves the minimum electric weight (Xa) of data.
Described Storage Media is wherein asked for the interval time (Ts) that measures battery electric quantity next time, and its calculating formula is:
Measure the unit interval power consumption (Xs) of (Ts)=still spendable electric weight interval time (Xb) formula/electronic installation of battery electric quantity next time.
Description of drawings
Fig. 1 is the main square configuration of the preferred embodiment figure of portable electric device of the present invention;
Fig. 2 is the organigram of ADC assembly;
Fig. 3 prolongs the main implementation step process flow diagram of the method preferred embodiment of preserving data time for the present invention.
Embodiment
Technology contents of the present invention and effect will describe in detail in will describing in detail in the preferred embodiment of following conjunction with figs..
As shown in Figure 1, the preferred embodiment of portable electric device 1 of the present invention, be that PDA (Personal Digital Assistant) (PDA) with a tool Mobile Communications function is an example, measure an assembly 15 and a managing electric quantity module 131 and a battery 11, a microprocessor 12, a recording medium 13, a plurality of peripheral module 14, of specific function that provides mainly are provided.
Battery 11 is in order to provide electronic installation 1 needed in the use electric weight, to allow electronic installation 1 interior each module and assembly be able to normal running.
Microprocessor 12 (CPU) is in order to the running of control electronic installation 1, and with cooperation recording medium 13, peripheral modules 14, measurement assembly 15 and other necessary assembly, and common execution is as the functions such as managing electric quantity of battery 11.
Recording medium 13 mainly comprises non-volatile recording medium and a volatility recording medium (figure does not show) that connects microprocessor 12 respectively.Non-volatile recording medium is the flash memory (Flash Memory) of main store operation system (OS) program and basic application software (AP) in the present embodiment, and volatility recording medium then is a random access memory (RAM) in order to store other application program and personal data.Above-mentioned non-volatile and volatile definition, be with this recording medium 13 once after interrupting electric power supply, the data of former storage whether still can keep or with disappearance decide, and recording medium 13 saves as example to be mounted in electronic installation 1 inside in present embodiment, so in other changes example, also can be drawing out type memory card (as specifications such as SD, xD, Memory Stick, Compact Flash) or other is applicable to the data storing assembly of portable electric device 1.
Peripheral modules 14 comprises a wireless communication module 141 in order to provide this electronic installation 1 specific function and running in present embodiment, have and the extraneous function of transmitting message to provide electronic installation 1 to possess.And this wireless communication module 141 can be according to known Mobile Communications agreement (as GSM (GlobalSystem for Mobile Communication " Global System for Mobile Communication "), GPRS (GeneralPacket Radio Service " integration General Packet Radio Service (GPRS) "), CDMA (Code Division MultipleAccess " code division multiple access "), and PHS (Personal Handy phone System " low-power action telephone system ") etc.), transmit message with long-range another communication device (as the PDA (Personal Digital Assistant) or a mobile phone of a same tool Mobile Communications function, figure does not show).This peripheral modules 14 still comprise one in order to GPS module 142 (satellite positioning module) that this electronic installation 1 satnav service function is provided, in order to blue bud module 143 (Blue tooth) that this electronic installation 1 communication transfer function is provided and in order to providing electronic installation 1 display message and, but not as limit for the LCD module 144 (LCD MODULE) of user's function of browse.
Measure assembly 15 mainly in order to the remaining capacity of the battery 11 that measures electronic installation 1, and measure assembly 15 is to be example with the ADC assembly (analog-digital converter) that is installed in the electronic installation 1 in present embodiment, wherein the ADC assembly is in order to receiving analog input (voltage or electric current), and is converted to the digital value that can be read by microprocessor 12.See also shown in Figure 2, a simple voltage input ADC is provided, the input of this assembly is partly formed by two: reference signal and measuring-signal, this output is then represented for transferring input signal to 8 bit digital, and this reference voltage then is the maximal value that ADC can change, because the ADC assembly belongs to the known assemblies that generally is usually used in measuring voltage or electric current, in this not elsewhere specified (NES).The measurement assembly 15 of present embodiment changes in the example in other, also can be the electrical measurement assembly that other is applicable to portable electric device 1.
Managing electric quantity module 131 is to realize with a program that is stored in volatility recording medium 13 in the present embodiment, and store the setting data and the formula of the battery 11 of relevant electronic installation 1 in volatility recording medium 13, comprising: total battery 11 electric weight (X), the unit interval power consumption (Xs) of electronic installation 1, system preserves minimum electric weight (Xa) formula of data, estimate to preserve user's data time length (T), still spendable electric weight (Xb) formula, measure length (Ts interval time of battery 11 electric weight next time, Ts ') formula and permeametry assembly 15 measures obtained current battery 11 charge values (Xc) of battery 11 etc.; Wherein the formula definition value is as follows:
A. system preserves the unit interval power consumption (Xs) of minimum electric weight (Xa) formula=expectation preservation user's data time length (T) * electronic installation of data;
B. still spendable electric weight (Xb) formula=battery current battery charge value (Xc)-system preserves the minimum electric weight (Xa) of data;
C. measure the unit interval power consumption (Xs) of length interval time (Ts) formula=still spendable electric weight (Xb) formula/electronic installation of battery electric quantity next time;
D. consider the factor of external interference and have influence on battery consumption, and get its error, obtain measuring actual next time interval length between the battery electric quantity (Ts ')=next time measure length interval time (Ts) * (1-error amount) of battery electric quantity;
Wherein, these battery 11 current batteries, 11 charge values (Xc) are via measuring assembly 15 numerical value that obtains that measures, and the unit interval power consumption (Xs) of these battery 11 total electric weight (X), expectation preservation user's data time length (T) and electronic installation 1 is the default value that is stored in recording medium 13 in present embodiment, or also can be through user's input or through measuring obtained numerical value in other alternate embodiment.
And after managing electric quantity module 131 starts, can utilize and measure the dump energy (Xc) that assembly 15 auto-measuring batteries 11 obtain, drop to system and preserve the required time of the minimum electric weight (Xa) of data and be set at length interval time (Ts) that next time measures to calculate current battery 11 electric weight (Xc) distance, when electric weight (Xc) value that measures has been lower than electric weight (Xa) value of this minimum preservation data, promptly close the supply electric weight of peripheral modules 14, this microprocessor 12, recording medium 13 only are provided and measure the required electric weight of assembly 15 runnings; Assembly 15 to be measured measures that charging surpasses when setting the minimum electric weight (Xa) of preserving data to battery 11, promptly recovers the required electric weight of above-mentioned peripheral modules 14 runnings of supply, and to recover normal operation, its details as described later in detail.
Corresponding above-mentioned portable electric device 1, the present invention also discloses a kind of method that electronic installation is preserved data time that prolongs, and its implementing procedure is as described in Figure 3.
At first shown in step 301, portable electric device 1 at first can utilize and measure the battery 11 remaining charge values that assembly 15 removes to measure electronic installation 1 after starting this managing electric quantity module 131, and the charge value that measures is sent to microprocessor 12; For another example shown in the step 302, microprocessor 12 is after receiving current battery 11 charge values, can grasp aforementioned inner setting value and formula to the managing electric quantity module 131 of recording medium 13, comprise: battery 11 total electric weight (X), the unit interval power consumption (Xs) of electronic installation 1, estimate to preserve user's data time length (T), system preserves minimum electric weight (Xa) formula of data, still spendable electric weight (Xb) formula reaches length interval time (Ts) formula that next time measures battery 11 electric weight, computing then obtains to measure length interval time (Ts) value of battery 11 electric weight next time, and its relational expression illustrates as follows:
Suppose: battery 11 total electric weight (X)=1000mA (milliampere);
Expectation preservation user's data time length (T)=72hr (hour);
Unit interval power consumption (the Xs)=5mA/hr of electronic installation 1;
Record current battery 11 electric weight (Xc)=500mA via measuring assembly 15;
Therefore, can obtain:
System preserves minimum electric weight (Xa) formula=T*Xs=360mA of data;
Still spendable electric weight (Xb) formula=Xc-Xa=140mA;
Measure (Ts) formula=Xb/Xs=28hr interval time of battery 11 electric weight next time;
In addition, further contemplate the factor of external interference in the present embodiment and have influence on the consumption of battery 11, and get its error, for example:
Desirable 10% error obtains:
Actual length interval time that next time measures battery 11 electric weight (Ts ')=28hr* (1-10%)=25.2hr;
Therefore, managing electric quantity module 131 can be measured battery 11 remaining electric weight once more after 25.2 hours, be beneficial to managing electric quantity module 131 and judge whether to take the power saving measure.For another example shown in the step 303,304,305, after the preceding reality of calculating acquisition that arrives measures interval length between battery 11 electric weight (Ts ') next time, measurement assembly 15 can carry out the measurement to battery 11 dump energies again, and judges via microprocessor 12 whether the charge value of above-mentioned measurement has been lower than the minimum charge value (Xa) that system preserves user's data; If not, then return step 302, calculate length interval time that next time measures by microprocessor 12; If be, then carry out step 305, promptly close the supply electric weight of peripheral modules 141, for example: wireless communication module 141, GPS module 142, blue bud module 143 and LCD module 144 etc., and microprocessor 12, recording medium 13 only are provided and measure the required electric weight of assembly 15 runnings.
At last then as step 306,307, shown in 308, for judging whether this battery 11 has the step of charging or being replaced by another battery with enough electric power 11, with judgment mechanism as the supply electric weight of replying peripheral modules 14, wherein after closing peripheral modules 14, can utilize this measurement assembly 15 periodically to measure the present electric weight of battery 11, when the electric weight that assembly 15 to be measured measures battery 11 up till now surpasses the minimum electric weight (Xa) of setting the preservation data (represent user charge or be replaced by another battery with enough electric power 11) for battery 11, promptly recover the required supply electric weight of above-mentioned peripheral modules 14 runnings of supply, to allow electronic installation 1 be returned to the running of normal function.
Comprehensively above-mentioned, the invention provides a kind of portable electric device 1 and prolong the method that electronic installation 1 is preserved data time, it can be when detecting the few electric weight of battery 11 residues, reduce the consume of battery 11 electric weight via the supply electric weight of closing some peripheral modules 14, make electronic installation 1 power saving to reach, and prolong electronic installation 1 still can be preserved data when battery 11 extremely hangs down electric weight time, to allow the user can change battery 11 as quickly as possible or to battery 11 action of charging, the supply electric weight of the peripheral modules of closing 14 before replying thus, keeping the normal operation of electronic installation 1, and obviously promote its ease of use.
The foregoing description is only given an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that claim is described certainly, but not only limits to the foregoing description.

Claims (15)

1, a kind of portable electric device that prolongs the data holding time, it comprises:
One battery provides this electronic installation running required electric weight;
One microprocessor is in order to control this electronic installation running;
One recording medium is in order to store this battery related setting;
At least one peripheral module is in order to provide specific function of this electronic installation and running;
One measures assembly, in order to measure the dump energy of this battery; And
One managing electric quantity module, be stored in this recording medium, for this microprocessor load and execution, it measures this battery dump energy that obtains and cooperates the stored battery related setting value of this recording medium according to this measurement assembly, drop to minimum preservation data electric weight required time with this electric weight of computed range, and as this measurement assembly the interval time that measures this battery dump energy next time, when this battery dump energy value that records is lower than this minimum preservation data charge value, promptly close the supply electric weight of this peripheral module, to reduce the consumption of battery electric quantity.
2, portable electric device as claimed in claim 1 is characterized in that, wherein this peripheral module comprises one provides electronic installation and the extraneous wireless communication module that transmits message.
3, portable electric device as claimed in claim 1 is characterized in that, wherein this peripheral module comprises a satellite positioning module that this electronic installation satnav service function is provided.
4, portable electric device as claimed in claim 1 is characterized in that, wherein this peripheral module comprises a blue bud module that this electronic installation communication transfer function is provided.
5, portable electric device as claimed in claim 1 is characterized in that, wherein this peripheral module comprises a display module that this electronic installation Presentation Function is provided.
6, portable electric device as claimed in claim 1 is characterized in that, wherein this measurement assembly is an analog-digital converter.
7, a kind of method that prolongs electronic installation preservation data time, this electronic installation has a battery and at least one peripheral module that specific function and running are provided, and its step of this method comprises:
Measure the present charge value of this electronic device battery;
This charge value of computed range drops to the minimum required time of preservation data charge value, and is set at the interval time that measure battery electric quantity next time;
When arriving this setting-up time, measure the electric weight of this remaining battery;
Judge whether this electric weight has been lower than the electric weight of this minimum preservation data; If be, promptly close the supply electric weight of this peripheral module; Otherwise, repeat above-mentioned steps.
8, prolongation electronic installation as claimed in claim 7 is preserved the method for data time, it is characterized in that, wherein is according to the battery electric quantity value of this measurement and cooperates the battery related setting value computing gained that stores in this electronic installation this interval time.
9, prolongation electronic installation as claimed in claim 8 is preserved the method for data time, it is characterized in that wherein this setting value comprises: the unit interval power consumption of estimating to preserve user's data time length, electronic installation.
10, prolongation electronic installation as claimed in claim 9 is preserved the method for data time, it is characterized in that, wherein the step in the interval time of obtaining measurement next time battery electric quantity also comprises:
Ask for the minimum electric weight that system preserves data, its calculating formula is:
System preserves the unit interval power consumption of minimum electric weight=expectation preservation user data time length * electronic installation of data;
Ask for still spendable electric weight, its calculating formula is:
Still spendable electric weight=battery current battery charge value-system preserves the minimum electric weight of data;
Ask for length interval time that measure battery electric quantity next time, its calculating formula is:
Measure the unit interval power consumption of the length interval time=still spendable electric weight formula/electronic installation of battery electric quantity next time.
11, a kind of Storage Media, store a program and supply an electronic installation load and execution, this electronic installation has a battery and at least one peripheral module that specific function and running are provided, and this program will make this electronic installation carry out following step after this electronic installation load and execution:
A, measure the battery dump energy value of this electronic installation;
B, cooperate the battery related setting value that stores in this electronic installation, obtaining the minimum battery electric quantity that this system preserves data, and calculate the still spendable at present electric weight of this battery;
C, ask for apart from this charge value and drop to minimum preservation data charge value required time, and be set at the interval of next measurement time;
D, when arriving this setting-up time, measure the charge value of this remaining battery;
E, judge whether this charge value has been lower than this minimum preservation data charge value; If be, promptly close the supply of current of peripheral module; Otherwise, get back to step a.
12, Storage Media as claimed in claim 11 is characterized in that, wherein this setting value comprises: the unit interval power consumption of estimating to preserve user's data time length, electronic installation.
As claim 11 or 12 described Storage Medias, it is characterized in that 13, wherein ask for the minimum battery electric quantity value that this system preserves data, its calculating formula is:
System preserves the unit interval power consumption of minimum electric weight=expectation preservation user data time length * electronic installation of data.
14, Storage Media as claimed in claim 13 is characterized in that, wherein asks for the still spendable at present charge value of this battery, and its calculating formula is:
Still spendable electric weight=battery current battery charge value-system preserves the minimum electric weight of data.
15, Storage Media as claimed in claim 14 is characterized in that, wherein asks for the interval time that measures battery electric quantity next time, and its calculating formula is:
Measure next time battery electric quantity the interval time=the unit interval power consumption of still spendable electric weight formula/electronic installation.
CN 200510009052 2005-02-17 2005-02-17 Device and method for prolonging electronic device data storage time Pending CN1648921A (en)

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Application Number Priority Date Filing Date Title
CN 200510009052 CN1648921A (en) 2005-02-17 2005-02-17 Device and method for prolonging electronic device data storage time

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Application Number Priority Date Filing Date Title
CN 200510009052 CN1648921A (en) 2005-02-17 2005-02-17 Device and method for prolonging electronic device data storage time

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Publication Number Publication Date
CN1648921A true CN1648921A (en) 2005-08-03

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101135720B (en) * 2006-08-31 2010-09-15 纬创资通股份有限公司 System for detecting battery electric quantity and mobile phone thereof
CN102135921A (en) * 2011-02-16 2011-07-27 无锡盖亚科技有限公司 Protective circuit, protective method and software realizing method for portable terminal low-power system protection
CN104243551A (en) * 2008-10-31 2014-12-24 高通股份有限公司 Wake-up trigger for implementation of target actions
CN111146516A (en) * 2018-11-06 2020-05-12 广达电脑股份有限公司 Electronic device and method for prolonging service life of battery thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101135720B (en) * 2006-08-31 2010-09-15 纬创资通股份有限公司 System for detecting battery electric quantity and mobile phone thereof
CN104243551A (en) * 2008-10-31 2014-12-24 高通股份有限公司 Wake-up trigger for implementation of target actions
CN102135921A (en) * 2011-02-16 2011-07-27 无锡盖亚科技有限公司 Protective circuit, protective method and software realizing method for portable terminal low-power system protection
CN102135921B (en) * 2011-02-16 2012-09-26 无锡盖亚科技有限公司 Protective circuit, protective method and software realizing method for portable terminal low-power system protection
CN111146516A (en) * 2018-11-06 2020-05-12 广达电脑股份有限公司 Electronic device and method for prolonging service life of battery thereof

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Open date: 20050803