Posted by MarkB_MI on January 05, 2023 at 06:51:07 from (174.240.149.220):
In Reply to: Amps vs volts posted by rrlund on January 05, 2023 at 06:36:27:
Typical battery chargers don't really regulate the voltage, although the better ones do. Your garden-variety battery chargers run the full-wave rectified diode output directly to the battery. Since the diodes can only conduct when they're forward-biased, the battery is only getting charged for a portion of the ac cycle. If the battery is almost dead, then it gets charged something like 70 percent of the cycle; when it's fully charged it might be getting a charge only 10 percent of the cycle. So what looks like regulation is just the effect of rising battery voltage on the charger output's duty cycle.
If you used an oscilloscope to look at the output of a battery charger with just a small resistive load on it, you would see a full-wave rectified ac signal that's something like 16 to 20 volts peak. If you hook a battery up to the charger, you would see a clipped rectified ac signal, with the voltage clipped at whatever the battery voltage is.
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