D
Dan
Hi, I'm looking to build the aforementioned supply for a 6A 36V motor.
Since I can't find anyone with 10:3 transformers, I guess I'm stuck with
building a power supply that takes the ~60V half wave (after
rectification) that the wall gives me and outputing 36V from that.
Unfortunately, a standard zener/transistor setup would require such
incredibly high wattage that building one would probably cost about as
much as buying a small country.
So instead I thought about building a switched supply based on a SCR.
The schematic is at http://www.nmia.com/~overhaul/regulator.gif Not
being an electronics engineer, I don't know if this circuit will even
work. But here's the idea of operation:
Start with capacitor discharged and no input voltage applied. Then
"turn on the power switch." The voltage at 'b' is 0V, and at 'a' is
about 3.1V right? This should trigger the SCR into conduction, charging
the capacitor. When the capacitor reaches 39V-Vgt, the SCR will not
turn on again, and after a slightly higher voltage will even turn itself
off. This should hold the voltage close to 36V across the capacitor.
So the obvious questions are: Will this circuit work? Is it practical?
Is there a better way to accomplish what I want to do?
Thanks
Since I can't find anyone with 10:3 transformers, I guess I'm stuck with
building a power supply that takes the ~60V half wave (after
rectification) that the wall gives me and outputing 36V from that.
Unfortunately, a standard zener/transistor setup would require such
incredibly high wattage that building one would probably cost about as
much as buying a small country.
So instead I thought about building a switched supply based on a SCR.
The schematic is at http://www.nmia.com/~overhaul/regulator.gif Not
being an electronics engineer, I don't know if this circuit will even
work. But here's the idea of operation:
Start with capacitor discharged and no input voltage applied. Then
"turn on the power switch." The voltage at 'b' is 0V, and at 'a' is
about 3.1V right? This should trigger the SCR into conduction, charging
the capacitor. When the capacitor reaches 39V-Vgt, the SCR will not
turn on again, and after a slightly higher voltage will even turn itself
off. This should hold the voltage close to 36V across the capacitor.
So the obvious questions are: Will this circuit work? Is it practical?
Is there a better way to accomplish what I want to do?
Thanks