I built a power supply for a micro-controller board that requires 5VDC and peak of 1A (typically sits at 500mA). The power supply has an input of 24VAC. I used a bridge rectifier and an LM2575-5 switching regulator to get 5V 1A. All good, worked well.
Problem is I've now found out that the 24VAC input transformer must to shared with some external devices in the same system (controls equipment), and they use a 24VAC transformer with the secondary neutral grounded. This made my bridge rectifier go bang!
I don't want to have to use a separate 24VAC transformer, so I was thinking of using a half-wave rectifier. I've found that the LM2575 regulator will accept about 8V to 40V input and is about 75% efficient. To overcome the ripple from the half-wave rectifier, the smoothing capacitor would need to be huge.
Surely there's a better way to do this! Maybe a half-wave rectifier isn't the right way to go about this? I'd really appreciate some advice and suggestions.
Disclaimer: I'm not an EE, just a tinkerer... In case that isn't already obvious ;-)
Edit: Here's a circuit diagram.
simulate this circuit – Schematic created using CircuitLab