A battery charger is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it.
The charging protocol depends on the size and type of the battery
being charged. Some battery types have high tolerance for overcharging
and can be recharged by connection to a constant voltage source or a
constant current source; simple chargers of this type require manual
disconnection at the end of the charge cycle, or may have a timer to cut
off charging current at a fixed time. Other battery types cannot
withstand long high-rate over-charging; the charger may have temperature
or voltage sensing circuits and a microprocessor controller to adjust
the charging current, and cut off at the end of charge. A trickle
charger provides a relatively small amount of current, only enough to
counteract self-discharge of a battery that is idle for a long time.
Slow battery chargers may take several hours to complete a charge;
high-rate chargers may restore most capacity within minutes or less than
an hour, but generally require monitoring of the battery to protect it
from overcharge. Electric vehicles need high-rate chargers for public
access; installation of such chargers and the distribution support for
them is an issue in the proposed adoption of electric cars.
Simple AC-powered battery chargers have much higher ripple current and ripple voltage than other kinds of battery supplies. When the ripple current is within the battery-manufacturer-recommended level, the ripple voltage will also be well within the recommended level. The maximum ripple current for a typical 12 V 100 Ah VRLA battery is 5 amps. 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 is within 3% of the life of a constant DC-charged battery.[2]
The charging protocol depends on the size and type of the battery
being charged. Some battery types have high tolerance for overcharging
and can be recharged by connection to a constant voltage source or a
constant current source; simple chargers of this type require manual
disconnection at the end of the charge cycle, or may have a timer to cut
off charging current at a fixed time. Other battery types cannot
withstand long high-rate over-charging; the charger may have temperature
or voltage sensing circuits and a microprocessor controller to adjust
the charging current, and cut off at the end of charge. A trickle
charger provides a relatively small amount of current, only enough to
counteract self-discharge of a battery that is idle for a long time.
Slow battery chargers may take several hours to complete a charge;
high-rate chargers may restore most capacity within minutes or less than
an hour, but generally require monitoring of the battery to protect it
from overcharge. Electric vehicles need high-rate chargers for public
access; installation of such chargers and the distribution support for
them is an issue in the proposed adoption of electric cars.Types of battery chargers
Simple
A simple charger works by supplying a constant DC or pulsed DC power source to a battery being charged. The simple charger does not alter its output based on time or the charge on the battery. This simplicity means that a simple charger is inexpensive, but there is a tradeoff in quality. Typically, a simple charger takes longer to charge a battery to prevent severe over-charging. Even so, a battery left in a simple charger for too long will be weakened or destroyed due to over-charging. These chargers can supply either a constant voltage or a constant current to the battery.Simple AC-powered battery chargers have much higher ripple current and ripple voltage than other kinds of battery supplies. When the ripple current is within the battery-manufacturer-recommended level, the ripple voltage will also be well within the recommended level. The maximum ripple current for a typical 12 V 100 Ah VRLA battery is 5 amps. 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 is within 3% of the life of a constant DC-charged battery.[2]
Trickle
Main article: Trickle charging
A trickle charger is typically a low-current (500–1,500 mA) battery
charger. A trickle charger is generally used to charge small capacity
batteries (2–30 Ah). These types of battery chargers are also used to
maintain larger capacity batteries (> 30 Ah) that are typically found
on cars, boats, RVs and other related vehicles. In larger applications,
the current of the battery charger is sufficient only to provide a
maintenance or trickle current (trickle is commonly the last charging
stage of most battery chargers). Depending on the technology of the
trickle charger, it can be left connected to the battery indefinitely.
Some battery chargers that can be left connected to the battery without
causing the battery damage are also referred to as smart or intelligent
chargers.
Here's battery car chargers selection:
Schumacher SC-600A SpeedCharge High Frequency Battery Charger |
Customer Review: Click Here for More Info |
$31.65 
|
Energizer CHP4WB4 Recharge Smart AA/AAA Charger with 4 AA NiMH Batteries |
Customer Review: Click Here for More Info |
$15.97
|
Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger |
Customer Review: Click Here for More Info |
$24.48
|
T-1199B AA/AAA/C/D/9V Battery Charger NiMH NiCD |
Customer Review: Click Here for More Info |
$15.95
|
 Schumacher SE-5212A Automatic Handheld Battery Charger |
Customer Review: Click Here for More Info |
$49.39 |
0 comments:
Post a Comment