I built a simple LM317 based SLA charger, schematic can be found here: http://www.vt52.com/diy/myprojects/other/charger/charger.htm
This circuit limits the current drawn, by the battery, to 500mA. My question is: am I correct in saying this circuit limits current and does not qualify for a constant current charger?
The way it limits current is by lowering the voltage, which gives a much lower than required voltage on the battery terminals, in the region of 12.4V. This voltage slowly increases as the battery draws less current, until it reaches its preset voltage of 14V.
How is active current limiting possible, without lowering the voltage?
This circuit limits the current drawn, by the battery, to 500mA. My question is: am I correct in saying this circuit limits current and does not qualify for a constant current charger?
The way it limits current is by lowering the voltage, which gives a much lower than required voltage on the battery terminals, in the region of 12.4V. This voltage slowly increases as the battery draws less current, until it reaches its preset voltage of 14V.
How is active current limiting possible, without lowering the voltage?