Used in fast voltage control load to avoid overloading the internal methods of detection, most common are fixed, temperature control and more control, or mixed-use three ways.
1. Constant voltage control
When the battery voltage is detected at a voltage almost bit set to stop the charge. This approach is the easiest way to know that as the characteristics of the Laptop battery in the battery voltage curve upward, you can detect the voltage to the nearest filling when the quasi-saturation space, different styles of recharge battery when the voltage is almost saturated like the old and new batteries are not the same characteristics, using this method can not put more ideal tension. Although this method is simple but also very dangerous, said earlier, temperature is higher than the battery voltage and reduce current load will be raising the temperature of the battery, so it may have been perceived the battery voltage has not yet reached saturation, but the quasi-set position, and the battery charging voltage does not increase after saturation began lower and thus the consequences of overloading is very serious, if it comes with an internal short-circuit the battery charger is not able to protect the circuit, once the current consequences are too dangerous would be unthinkable, so this way during charging, the user should take note.
2. The temperature rise control
Battery charge generated during the oxygen saturation in the cathode of cadmium oxide and heat of reaction, the battery temperature begins to increase rapidly using this phenomenon to detect when the temperature reaches a certain extent, both the end of the load. In the same amount of charge under the current load plus the increase of the higher temperature, so if the load current is too large to meet the set temperature of the 40Y6797 battery may not have been saturated, but the current if it is too small, then oxidation to absorb quickly the temperature does not increase significantly, the charge movement was to continue but can not terminate. In addition, this approach will be affected by ambient temperature and can determine the battery temperature is in the self-product of chemical heat, or the environment caused by the heat of denial of justice, so this method in a high temperature environment will be charged absence of a cold is too cold.
3. Control
Charging the battery voltage increases as capacity increases load when the load capacity to reach saturation, the voltage rises to the point, and instead began to decline slowly. Enjoy this voltage drop characteristics can be used to control the voltage charge termination shall be when the drop was not more demanding, typically 1.2V nickel-cadmium batteries will be 20mV of its decline is almost complete (the actual size of data May refer to the VGP-BPS8 battery) in the process of charging can be clearly observed count Out. curve of charging voltage of battery is charging current and temperature effects in the same load capacity, the current is higher or lower temperature, the voltage increases the margin is low, the decline is also more obvious. Current is smaller, or the higher the temperature, the voltage increased the smallest rate of decline is relatively flat is not easy to distinguish. Therefore, control methods applied fairly rapid charging years, and to avoid the influence of temperature to detect the failure, usually with the control of the temperature increase in the use, in order to avoid overcharging.
Nickel-cadmium batteries, they are saved by the use of long-lost, or have already dusk, and the first few minutes before recharging will take place and the tension is not only the filling of the case will also down then up the cases involving the termination of a miscarriage of justice charges. Control method is a better method of controlling the characteristics of different batteries can still use the features of the batteries fully charged issues, the comparison does not need to worry about voltage control or adjustment the temperature function and damage the battery.
Currently, computer advanced many controlled chargers are the use of such control, and the price is expensive than ordinary chargers, and some of the reputation of the name even if, in fact its control programs and the load circuit is not their design, have tended to have misjudged the situation, rather than the battery charge enough to cook an egg, which is not even enough to strike are not yet sufficient to determine the battery was full, so better a charger in addition to increasing the temperature beyond the control of, and then under the non-recurring charge, voltage and current size evolution, calculate the load capacity and to determine if the VGP-BPS9 battery has really reached the saturation point.
The three methods are fast charging method, after loading, depending on the characteristics of the battery self-discharge, usually on the battery to continue to impose a small surcharge to offset the current battery leakage underway, and the speedy and can not be be able to achieve one hundred percent guarantee that is fully charged, charging a small current to continue to fill gaps in just to fill the building. usually about the size of the C / 20 ~ C/40 additional current between the general use of the fast charge mode the charger to recharge the battery to terminate after all Kangjing OK to enter what is called the slow charge mode Indeed, that is, as a small current to continue to supplement battery charging. In this mode, the small current is almost not let the battery produces little heat, not letting the tension is much change for shippers are almost always intended to complement the purposes of collecting and will not stop not automatically, but not yet as to the apple A1022 battery battery caused by overloading, but to avoid increasing the crystallization behavior of nickel, users always have the discretion to add time of pricing.