Need help choosing and finding a power transformer.

[SittingBear]

Hello EEVBlog Forums,
I'm planning on making my own power supply for my project which requires anywhere from 24Vrms to 28Vrms in. The transformer will feed to a rectifier, a filter, and a smoothing capacitor.

The circuit itself will be 3 boost drivers. Each boost driver will drive a, roughly, 48V LED strip (16 LEDs in series; average Vf is 3.0V). To get best efficiency out of the driver, I want to be as close as possible to the output voltage without exceeding the maximum Vin of the drivers. I could use two separate power supplies, though I would rather use one transformer.

The maximum current draw from each driver is 1.0A, so I'm guessing my maximum current handling capability should be > 3.0A.

Since I do not know a lot about power transformers I am asking for advice in helping me find and choose a transformer with the current handling capability without accidentally choosing the wrong transformer, or paying a hefty amount for something that is overkill.

If there's any information I have left out, I'd be happy to answer it.


Thanks,
-Bear

[German_EE]

No transformer is needed in this application. Feed your 24VAC into a voltage doubler and get 48V DC out. In view of the currents involved you might need large electrolytic capacitors but that's the only problem I see.

[SittingBear]

No transformer is needed in this application. Feed your 24VAC into a voltage doubler and get 48V DC out. In view of the currents involved you might need large electrolytic capacitors but that's the only problem I see.

I'm not sure a voltage doubler would be able to handle the load.