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Registered Member #2321
Joined: Fri Aug 28 2009, 05:13PM
Location: Boston, MA
Posts: 34
Went to a local tech swapfest and picked up a 24 VAC 40amp wall transformer. That's 960 watts!
I plan on using this for feeding a ZVS circuit that I'm slowly collecting parts for.
The only problem of course is that it requires rectification. I found this Bridge Rectifier capable of handling 40 amps. And then my plan is to add a smoothing electrolytic in parallel after the bridge.
Is this a good setup? My only concern is the rating on that bridge rectifier. I would either want to build in a current limiting mechanism in a form of series capacitor in front of the bridge or user a higher rated component for the bridge.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
That bridge needs no surge limiter, impedance of that wall transformer will suffice. Fuse the primary with a 15 amp time lag fuse, like a microwave oven fuse to prevent the secondary wiring from catching fire if it shorts.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Max. Spitzenstrom = 400A which will cover you for the inrush current into your filter capacitor. Put a slow blow 40A fuse between the transformer and the rectifier, and another fuse on the mains side of the transformer.
What do you mean by a 'wall transformer?' Doesn't it usual;ly mean one of those black plastic boxes that you plug straight into a mains socket - the things some here would call a 'wall wart'? Have they grown so fat that they can supply 960W, as you say, or do you mean something different by 'wall transformer?'
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Its a class 2 transformer which means even if the output terminals are shorted, it wont burn out. This is how doorbell transformers are made. It falls between rules about transformers, class 2 greater than 20 volts and less than 30.
As for the wisdom of purchase: The unit is valuable as a safe power source for a wide range of experiments; You can connect any value of capacitor after your bridge.
It looks like a unit used for pre-led garden light sets.
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Rectifying PSU for ZVS driver
