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Old 01-26-2021, 08:21 AM
electronerd122 electronerd122 is offline
Join Date: Jan 2021
Location: NY
Posts: 2
Default How Voltage Regulators work?


Can anyone provide me some good references where I can study about voltage regulators? Or give me some explanation here about their working. I got some useful information here but need some more explanation.

Thanks in advance!
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Old 01-26-2021, 10:40 AM
lr172 lr172 is online now
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,948

They get their supply power on the A lead and also sense the voltage on it. I sends increasingly higher current on the F lead in order to make the alternator output enough juice to match the voltage set point configured in the regulator. At a constant field current, as the demand increases on the Alt, it's volts will drop and vice versa. Alts with a powered field will regulated it;s output with the field current. As the alternator struggles to keep up with demand, its voltage will drop and the regulator will keep upping the field current until the voltage comes up to the set point of the regulator or the Alt will not take anymore current (reached it's output capacity).

Alt output also varies with RPM and the regulator deals with this in the same way.

Decades ago, these reg's used a set of points to open and close the field using the buss power source with unlimited current (poor mans PWM) and modern ones are solid state that regulate the current on the F lead with a chip (think LM317)

Regulators for PM Alt's behave very differently. They can't control the Alt, but instead massage the output to reach a desired voltage.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019

Last edited by lr172 : 01-26-2021 at 10:59 AM.
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Old 01-26-2021, 12:41 PM
Avanza Avanza is offline
Join Date: Jul 2020
Location: Vastervik Sweden
Posts: 57
Smile B/C regulator manual

Try this.

Good luck
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