Quote:
Originally Posted by Argus25
One of the early SMPS's for computers was the one in the IBM5155 computer from the early 80's . Recently I documented it, (as IBM didn't), there are remarks and schematics & waveforms
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That's not that early. There were SMPSUs in computers at least 10 years earlier, and switching regulators (taking in AC from a normal mains transformer) before that. And some were quite exotic. The HP2100A (The earliest version of PSU that the manual I have covers dates from 1971) had thryrstors in the mains bridge rectifier as a pre-regulator stage. Boschert did their infamous 2-stage PSUs in the late 1970s
You might look at the DEC 'PSU bricks' like the H744. This takes in 20-30VAC and gives out 5V at 25A max. It's a switching regulator (no isolation between input and output) based on the LM723 chip. The only custom component is the inductor. There are schematics on Bitsavers, but you will probably have to look through the CPU printsets to find them rather than there being specific manuals for the power supplies.