that voltage doubler circuit he's suggested is not a good idea for a high current supply. They work well at low currents but not at 350mA.
The 24Vac with a voltage doubler will give almost 70Vdc on very light load and as the load increases the ripple becomes enormous causing the average voltage to fall.
The 24Vac with a voltage doubler will give almost 70Vdc on very light load and as the load increases the ripple becomes enormous causing the average voltage to fall.
Most of the designs that I have seen are the voltage doubler type and as you say the ripple makes it almost useless at that point. I found a 48v 3a transformer but am unsure how to get the amps down to the level I need. I know it's just a matter of adding resistors and capacitors but in what order and where. Right now all of those formulas I had memorized are just gone.
Hi,I did not suggest a voltage doubler but a Delon (bridge) circuit.
it is the same as a voltage doubler, using diodes and capacitors to double the voltage.
If the correct name for the circuit is "Delon" then that is something else I will try to remember.
the circuit/load will draw as much current as it needs. Do not try to reduce the current, simply satisfy the demand....... I found a 48v 3a transformer but am unsure how to get the amps down to the level I need.
A 48Vac 3Aac will give you 65 to 75Vdc and continuous output of 750mA and stay cool.
If you want 48Vdc you need a 33Vac to 35Vac transformer.
I am working on a hybrid amp that requires a 48v 350ma power supply. I have a 24v 1.5a transformer that I would like to use. I'm just having trouble getting from 24v to 48v. Power supply designs are my week point. I'm learning as I go. Thanks for any help.
Bryant
So go to AnTek and buy the right transformer for $11 or $13.
G²
I think Andrew's replies have been the only useful ones so far.
I'm all about trying to use parts on hand. You could use your 48VAC transformer and a simple transistor regulator to drop the ~70VDC unregulated to 48VDC. You'll need a fair heatsink on the transistor, it would be dissipating about (70-48)V * 350 mA = 7.7W.
Here's an example:
zener regulated power supply
I'm all about trying to use parts on hand. You could use your 48VAC transformer and a simple transistor regulator to drop the ~70VDC unregulated to 48VDC. You'll need a fair heatsink on the transistor, it would be dissipating about (70-48)V * 350 mA = 7.7W.
Here's an example:
zener regulated power supply
Called Delon, I guess to distinguish it from other voltage doubler topologies:Hi,
it is the same as a voltage doubler, using diodes and capacitors to double the voltage.
If the correct name for the circuit is "Delon" then that is something else I will try to remember.
Voltage doubler - Wikipedia, the free encyclopedia
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