How to extend mobile phone battery life
Elimination of memory on a regular basis: the laptop battery because of the memory effect, it must be the elimination of memory on a regular basis. The battery is fully discharged and then re-filled. Electrical discharge can be put to use or discharge of the functions of charger also can use the cell phone back-up stand-by mode. If you can speed up the discharge display and lighting of the phone keys to open. To ensure that the batteries can be filled in accordance with the instructions manuals to control the time, sufficient to repeat, two or three discharge.
Optional power-saving mode: GSM standard with an advanced feature, that is, most of the phone have a "DTX" non-continuity.
Launch power-saving mode. In order to power, when the owner is not audible when the phone for the time being launched to reduce the power of radio. Experiments prove, DTX power-saving mode can extend talk time of 30-50 percent. In the quiet of the occasion should switch to static, short of ringing telephone. Select button, or turn off the display lighting. To avoid the bitter cold when the battery temperature is too low, or else time will be shortened.
powerbook battery types: mobile phone batteries are mainly three types: nickel cadmium (Nicd) batteries, nickel metal hydrogen (Nimb) batteries and lithium-ion battery. Nickel-cadmium batteries can be a greater load current for fast charging. The disadvantage is that the battery prone to memory effect; nickel metal hydride batteries, the industry has been referred to as "environmental protection batteries." It is the cell phone quality, safe and reliable, and is beneficial to the environment of the cell; lithium-ion PowerBook G4 battery energy storage of high-density, you can reduce the weight of the phone. The disadvantage is that the higher the cost.
Single lithium-ion battery protection of the chip design
Lithium-ion batteries to protect the design of its chip packaging is closely related to the structure, as shown in Figure 1 for the package in the internal lithium-ion batteries to protect the basic structure of the circuit. Under normal circumstances, charge and discharge control of CO-side control of the high potential for DO-side, N-discharge tube FET1 control and charge control in a turn-on control FET2, the circuit can be a work load to the battery discharge, can also be recharged laptop Battery-charging carried out; when the protection circuit is detected anomalies (charge-off, over and over-current discharge), so that the CO or DO low output in order to cut off the charge or discharge circuit to achieve protection.
In order to effectively use or discharge current charge current, FET1 and FET2 use on-resistance of a small power control. Their choice in addition to the principle of resistance is smaller, but also small and closed source and drain breakdown voltage should be able to withstand does not match the charger. In theory, FET1 and FET2 can control N can also be used P pipe. However, due to a single lithium-ion battery protection circuit of low-voltage power supply, in order to reduce the resistance, generally using N control. Figure 1 is a diode FET1 and FET2 parasitic diodes, the existence of the system they have in the state can discharge the battery charge, charge-off in the state can discharge the load.
Lithium-ion batteries to protect the chip applications requiring low current drive, high-precision detection of the characteristics of the other circuits due to the protection of the power supply is the Latitude D820 battery voltage, so the battery voltage changes, the protection circuit must be working properly, this article According to the connection as shown in Figure 1, the relationship between the design of a single low-power lithium-ion battery protection chip, the battery voltage can range of 1V-5.5V change.
System Design
Lithium-ion IBM batteries to protect the basic functions of the chip is the charge-off protection, over-discharge protection and over-current protection, over-current protection include the charge-discharge over-current protection and over-current protection. The following in order to protect the basic functions of the circuit as the starting point, his analysis of the system.
Anomaly detection
Lithium-ion battery protection circuit in order to achieve its basic functions, first of all need to detect anomalies. And the discharge had been charging the PA2522U-1BAS battery voltage detection is carried out partial pressure (sampling), compared with the voltage achieved; for over-current detection and protection of the chip will first of all in the process of charging and discharging current into power in the possession of FET1, FET2 on the Voltage, and then through the VM compared with the voltage, over-current discharge detection voltage is that, over-current charge is a negative voltage detection.
Signal interference filter
Usually in the lithium-ion battery protection circuit in the process of the work will interfere with the signal exists, the jamming signal, there are two main types: for a moment interference, which is the normal signal, in a very short period of time superimposed on a A larger signal. Another for interference fluctuations, which means the signal fluctuations. Figure 2 explains the process in order to charge the two types of interference, VCU for the charge-off voltage detection.
In order to prevent signal interference with the introduction of the protection circuit malfunction arising from the system point of view and adopt appropriate measures to reduce them.
Instant interference in the internal circuit protection circuit to add delay to filter out, that is, when the protection circuit is detected abnormal signals, delayed for some time and then shut down FET1 or FET2. According to the charge-off, over discharge, over-current lithium batteries on the extent of the harm to select a different time delay. In order to better protect the lithium F2019 battery , over-current discharge can be divided into three levels, namely an over-current protection, over-current protection and load-2 short-circuit protection, over-current of a longer delay, had flows more than 2 delay Over-current of a shorter delay, load and short circuit protection without delay immediately. Fluctuations in the interference in the internal circuit protection circuit to be coupled with slow to filter out.
Effective control of charge control tube to close
In the charging process, and FET2 source connected to the VM potential negative side, as a charge to protect the role, it must have been in charge and signal delay between the plus side CO-level conversion circuit, control logic Have a logic signal conversion, so that the CO-side potential is less than or equal to the potential end of the VM, in order to ensure effective FET2 off.
0V battery charge inhibiting function
Lithium-ion battery protection circuit can be carried out on the 0V battery charge, but also the realization of the prohibition on the 0V battery charge, the paper's design uses the latter, so that the function of the circuit protection against internal short-circuit the battery for charging. When the battery voltage of 0V battery voltage suppression VOINH (typical value of about 1V) or less when, FET2 potential of the gate was fixed for the VM's potential in order to prohibit the charge. When the battery voltage is equal to or higher than VOINH, can be recharged.
Other features
1) The charge-off in the state to protect the circuits required to prohibit the discharge over-current protection work. Because the batteries have been recharged after the load connected to the case, in the early discharge, the system is still in charge-off, this time bound to a large discharge current, over-current caused by the possibility of a lot; and over-current protection if the work on Turn-off will discharge circuit. In this way, once the batteries have been recharged, it may never be able to use;
2) play-off discharge protection, the protection of over-current protection circuit required to prohibit the charging function. When the battery discharge too, just connect the charger charging, the charge current will be great. At this point the Prohibition of charge over-current protection work, we can make sure the batteries have been recharged after discharge;
3) In order to reduce the charge current flowing through the internal parasitic diodes FET1 time, if a state of discharge have been connected to the charger and charging VM lower than the voltage over-current detection voltage, to lift-off delayed discharge.
Notebook computer lithium battery maintenance experience on
First of all, lithium batteries do not have time extraordinary charge to activate, you can not do, there have been charging circuit protection, the plug will be of no avail.
Second, the activation of the lithium laptop battery (charging curve is correct) for the first time in the general use, not to place a long time, or that the frequent charge that is used for some time, a method that is full charge and discharge, after the batteries that can be That is sufficient to use only in use for a long time before the need to re-re-re-charge and discharge fully corrected.
Finally, the lithium battery life mainly in charge and discharge cycles, the cycle is an absolute concept, for example, if you used the last 30% of the electricity, is full of electricity, in the future, they use 70% of the electricity, and full of electricity, the Is just a charge cycle, rather than two, so those who like to make use of rechargeable batteries of the players together, you own it in fact accelerated the end of battery life.
Some of the sources of misunderstanding:
Every time a rechargeable battery exhausted from the age-old from the NICD batteries, nickel-cadmium batteries that have memory effect, if clinging to make electricity, battery with the use of the increase in the number of electricity and has shown less and less of the state .
Later, the NIMH pavilion battery, fact, has no clear memory effect, but still need to complete the charging and discharging to maintain its normal power consumption shows that this is some of Japan to provide nickel-metal hydride charger refresh function of the principle.
Lithium batteries and there was virtually no memory effect, of course, long after the use of charge or curve will be slightly inaccurate, Apple provides a simple ical prompt you from time to time for battery charging and discharging for correction, but do not have a high frequency.
On the activation of the lithium battery factory just need to use a number in order to achieve the best condition, this is true, but the use of more than a dozen hours of the activation is not necessary (and meaningless) is now charging circuits are taken into account User-friendly, full of batteries will automatically cut off the charging circuit, so that you can not sleep at ease, this time could not plug in the power of fact, there is no difference.
Turning to charge more than a dozen hours of habit, or the age-old from the NICD, such as the battery charge mode slow start, as the original battery charging circuit design behind the general in order to maintain the normal temperature of the battery and battery to prevent damage, Use a small charge current slow manner, and this circuit under normal circumstances do not have the power to determine precise function, so users are recommended such a charge 14-16 hours to see, the error is generally in two or three hours If the charge flow is too large, too charge of the F2024A will cause serious harm.
Later, nimh for now and rechargeable lithium battery of fast circuit, has been a very good power detection, you can use the pulse-fast high-current charge, and also to maintain the battery in the normal temperature range, and to close Full capacity soon, in order to prevent the charge-off, the circuit from the high current pulse is converted to a gradual narrowing of the trickle charge, so that even if the full power detect some deviation, the more close to full power due to the smaller the current, at the last moment Charge current has been close to 0, no damage to the battery, which is why lithium batteries that 80% of the pre-charge 1 hour to complete, and full of the last 20% of the electricity it 4 hours.
Green curve for the battery charge curve, we can see that power (voltage) of the stage before the very rapid rise in the latter stages of a very gentle, corresponding to the charge current is that there is orange.
A similar understanding:
"As such, it is not, the battery is full, continue flying the power cord is no harm!"
This depends on many cases, by and large say definitely no problem with ah!
The book is in fact general with the F2024B used in the AC plug ah.
However, there is a special case for a period of time the battery will not have lost some of its own electricity, this is not matter whether you win or come packed in the same book, but when the power falls, it is necessary to determine whether the charging circuit for under normal use The electricity, in that it is necessary to charge again, imagine if the place is full of power and time again full, although users do not use the battery, but batteries are in the non-stop for a small amount of the charge and discharge, accumulated over the fact that Battery consumption in sufficient and effective release cycle, so good design will be a good circuit protection, once the end of the charge, the circuit will automatically cut off, since even if no long-term battery power led to the re-fall will not automatically start charging, unless You switch to using the battery mode.
Therefore, the possibility has been flying AC depends on your ability to design, Apple's book, and so have such protection, even though be it with ease.