In the rechargeable battery (battery or batteries chemical physics) the use of process, the charger is an important device to use its success, so was born a rechargeable Sony VGP-BPS2B Sony VGP-BPS2C battery, charger is a key issue because the charger will have a direct impact on the battery The two major technical indicators: 1) the capacity of rechargeable batteries, 2) recycling of rechargeable batteries once, that’s life. Until the sixties, however, before the technology of the shipper and the rapid development has not been widely used in the method is mainly driven by constant current or constant loading method, loading effects are not too good. This state of affairs to the point of sale of the sixties based on a minimum rate of the rechargeable battery in the curves of principles acceptable to the size of the load current decreased exponentially with time according to this rule only after confirmation n is not a voltage constant current or constant load are the most appropriate method. Because the load current constant, its initial charge current is always lower than the acceptability of the battery, resulting in low efficiency of charging, charge a long time, and charging the latter part of the Final battery charging current is always higher than the acceptable level, the internal gas deposit rate of the battery and thereby increasing the load to the end, while the supply current load of gas, all the precipitation, the battery Internal voltage increased rapidly, the battery temperature rose quickly followed, resulting in each active electrode supported on both fall and greatly reduces battery life, while the constant voltage charging method of load resulting in a very low initial resistance of the load current of the battery is too great, but time does not decrease exponentially (often depart from the curve of development). XPS M170 battery XPS M1710 battery
Research Laboratory under the load curves, but also by the so-called two times, three or more load time. The so-called two stage battery charging: the first current to constant voltage or constant load when the battery voltage reaches a certain level and then trickle charge the battery: the so-called three-step is usually the first line constant at the battery is to let the battery voltage after reaching this threshold in the second phase, the voltage is called the maximum load stage, when the load current to a low degree of transformation a third phase. The tax known limitation of pressure. In addition, because the need for a practical application, often also want to quickly charge the battery. Assign the quick charger battery charge There are two important factors: First, the bias voltage: 2 is the memory effect, in which the bias voltage is in the charging process, the accumulated charge at the electrodes cells require voltage generated, only obvious pairs increase the internal resistance of the battery on the effective way to eliminate its negative pulse method is used at both ends of the instantaneous flow from the battery to remove the accumulation of charge on the electrodes. And thus produces a pulse charging method: all batteries have a memory effect, you can repeatedly charge and discharge can be removed. These two effects should be attention charge controller design.
In fact, the controller is responsible to take leaps and bounds in recent years, developing a clear sign that most manufacturers of semiconductors in the world are shipping own charger chip, and in some cases also with CPU (ie CPU). Satellite M45 battery Satellite M50 battery
In summary, although there are a variety of pricing methods, but also have some effect, but has largely neglected an important fact that rechargeable batteries do not work in the ideal state, each cell has its own personality. Rather each has its own rechargeable batteries are different from other dry or even the battery charge and discharge the same curve, the curve even in the process of dynamic load as complete, which means that a good model for load control must be a change, and should be in charge of the battery and the discharge curve is the best. Indeed, each cell of the load at any time there is always an optimum charge current and charge mode, the question is how we can approach the halo of good value. Here are some good intelligent adaptive control methods for rapid control of the idea of charging electric Qin points.
1. Methods of control of the whole:
Use positive and negative (including the pulse O) pulses as the battery charge and control the discharge waveforms, including positive pulses to the pulse load, negative pulse to pulse discharge inter-dependent O pulse and pulse discharge between the charge and discharge the resting stage. In fact, the above three types of impulse control later in the process of speech may have a duration of Bears O, for example, pulse O negative pulse and the time period too, the overall control of the simulation waveform of pressure limiting charge mode: while the specific combination of pulse shapes can also simulate the constant current charging and so on. In short, in adjusting the waveform to simulate almost all waveforms and load mode; Latitude D830 battery Y9943
2. Acquisition information:
In this method, the information collected includes: positive pulse during the charging current size and time change: negative pulse during the discharge current and its variation with time: the battery temperature and its variation with Over time, the battery voltage and its variation over time. This information is used for the study and control of documents first-hand, through their analysis to estimate the strength of the internal battery and calculate the cell in which it stands, etc.;
3. Is full of judgment rule:
On the charge if the battery is charging process has been full of judgments is an important indicator of the charger if the battery is not full of wrongfully convicted for the entire result in less battery charge, which in turn cause Battery overload, both conditions are right on the battery life has a significant impact.
Taken together, the judge rules in the following categories:
● control timing;
● control voltage (voltage with a maximum increment of negative voltage and zero-voltage increment, etc.);
●Temperature Control (including maximum temperature, maximum temperature: rate of temperature change, etc.); A1045 PowerBook G4 15 battery
● current control.
A better approach is to adopt an integrated approach to determine, for each indicator to monitor in accordance with the principles of fuzzy mathematics score, respectively, in accordance with the degree of trust to make the best decisions.
The characteristics of this method are described below:
1. Charging technology can dynamically adjust the parameters for adjusting the value of the pulse charging, the battery charge curve and the curve of the current battery charge and discharge the same, because the curve is changed, if pulse load is constantly changing and adjusting;
2. To end the pricing strategy possible under the circumstances, under the principle of fuzzy math, chargers specific characteristics of stability and reliability, so that the load is not judicial error, which improves considerably the reliability of the shipper?
3. This technology does not require the type of battery, which means that this technology can be simultaneously charging lead, cadmium, nickel, zinc, silver, nickel-metal hydride or lithium, and the perceived effects are not due the cell type vary; ThinkPad T43 battery ThinkPad T60 battery
4. In addition, this technology also has the current requirements of the battery, as long as the battery does not short-circuit or open circuit may be normal for recharging the battery, so this technology can also reduce burden on Battery performance of recovery or healing function;
5. Because the law of adaptive control of the battery without injury, and more on the 4 points above, this technology extends battery life.
Actual civil Ni-MH battery charging method, because, taking into account the cost, portability, reliability requirements, most of them still use sub-Constant current charge mode control.