![]() ![]() A smart battery generally requires a smart charger it can communicate with (see Smart Battery Data). A smart battery is generally defined as one containing some sort of electronic device or "chip" that can communicate with a smart charger about battery characteristics and condition. Intelligent chargersĮxample of a smart charger for AA and AAA batteriesĪ "smart charger" should not be confused with a "smart battery". At present, this charging technique is only applicable to small batteries, not to high capacity systems. Because there are no open electrical contacts, there is no risk of electrocution. It is commonly used in electric toothbrushes and other devices used in bathrooms. This is achieved without the need for metal contacts between the charger and the battery. A charging station sends electromagnetic energy through inductive coupling to an electrical device, which stores the energy in the batteries. Inductive battery chargers use electromagnetic induction to charge batteries. Most are also capable of acting as standard overnight chargers if used with standard NiMH cells that do not have the special control circuitry. Most such chargers have a cooling fan to help keep the temperature of the cells at safe levels. The control circuitry can be built into the battery (generally for each cell) or in the external charging unit, or split between both. Fast chargersįast chargers make use of control circuitry to rapidly charge the batteries without damaging any of the cells in the battery. As long as the ripple current is not excessive (more than 3 to 4 times the battery manufacturer recommended level), the expected life of a ripple-charged VRLA battery will be within 3% of the life of a constant DC-charged battery. The maximum ripple current for a typical 12 V 100 Ah VRLA lead acid battery is 5 amps. Generally, when the ripple current is within a battery's manufacturer recommended level, the ripple voltage will also be well within the recommended level. Simple AC-powered battery chargers usually have much higher ripple current and ripple voltage than other kinds of battery chargers because they are inexpensively designed and built. These chargers also vary in that they can supply either a constant voltage, or a constant current, to the battery. Even so, many batteries left on a simple charger for too long will be weakened or destroyed due to over-charging. Typically, a carefully designed simple charger takes longer to charge a battery than otherwise because it is set to use a lower charging rate to prevent damage. This simplicity means that a simple charger is inexpensive, but there are tradeoffs. A simple charger typically does not alter its output based on charging time or the charge on the battery. A simple charger works by supplying a constant DC or pulsed DC power source to a battery being charged.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |