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A Simple Car Battery
Charger: This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter. To charge a battery just connect + and terminals of circuit to
corresponding terminals of battery. When battery is not charged, ammeter reading shows 1-3 amps. When battery is fully charged ammeter reads Zero
or nearly zero, after which battery should be removed from charger. The circuit is a full wave rectifier using 2 diodes for rectification. The capacitor is used for
smoothing. I think circuit works fine without capacitor since battery itself acts a BIG capacitor. But when you are using circuit to supply 12V (as a battery
eliminator) capacitor needs to be present. Care should be taken NOT to reverse + and terminals while connecting it to battery. (added 10/05)
Buck Converter Chargers also Provides System Power: 05/22/97 EDN Design Ideas / (added 4/02) -Switching Regulator
provides charge voltage setpoint with Current regulation, and second Switching Regulator provides5V System Power -Many systems require long-time operation during periods of power loss.
Often, a gel or wet-cell lead-acid battery is best choice because of high capacity and relatively low cost. ....
Car Battery Charger: quickly and easily charge most any lead acid battery, automatically turns charging off when ready
(added 4/02)
Charge Monitor for 12V lead acid battery.: A battery is a vital element of any battery-backed system. In many cases
battery is more expensive than system it is backing up. Hence we need to adopt all practical measures to conserve battery life. As per manufacturer's data sheets, a 12V rechargeable
lead-acid battery should be operated within 10. IV and 13.8V. When battery charges higher than 13.8V it is said to be overcharged, and when it discharges below 10.IV it can be deeply
discharged. A single event of overcharge or deep discharge can bring down … (added 6/06)
Circuit Charges Lead Acid Batteries:
02/03/97 EDN Design Ideas / (added 5/02) The circuit in Figure 1
charges lead-acid batteries in the conventional way: A current-limited
power supply maintains a constant voltage across the battery (2.4V/cell
or so, as specified by the battery manufacturer) until the charging
current decreases below a certain level (also specified by the
manufacturer but typically 0.01C). Normally, C represents the battery's
capacity in coulombs. However, in this context, C is a rate in coulombs
per second (amperes) that is numerically equal to C....
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