Certified idea for a repairable heavy duty power supply

Disk drives, Monitors, SuperCPU etc.
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Re: Certified idea for a repairable heavy duty power supply

Post by steveday72 » Tue Jun 20, 2017 7:54 am

I don't know if anything will eventually come of it, but I've been gathering parts for a 50/60hz selectable PSU over the past 2-3 years.

It will take a laptop DC input, convert that to what it needs via DC-DC modules. For the 9VAC output it will use an EGS002 pure sine wave module connected to an H-bridge drive, which will pass through a low-voltage 10A isolating transformer that I bought last week. All other outputs (5V for 64, 5V for fdd, 12V for fdd) will be generated via isolated DC-DC modules (like the Lucent ones - which you can buy surplus now and save $$).

I think I've just about got everything for the project now, but I'm too sick/injured to work on it (all I am able to do is read in bed 98% of the time ... (it's not good as some might think) 😬

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Re: Certified idea for a repairable heavy duty power supply

Post by Oge_user » Sun Jun 25, 2017 4:12 pm

Some time ago I was researching for the way to operate any machine, regardlessly of the Assy version, using fully regulated current without even touching the internal motherboard.

I was close to find a suitable method and it worked up to the point that a partially defective Breadbin motherboard, which had intermittent startup, worked perfectly everytime. I gave up helping with innovations though, not worth the sacrifice anymore.

The EGS002 seems to be a valid inverter and it may be tuned up with external filtering. Just make sure that it handles at least 1200mA without issues or peaks.

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Gyro Gearloose
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Re: Certified idea for a repairable heavy duty power supply

Post by Gyro Gearloose » Mon Jun 26, 2017 4:07 pm

People sure seem to love complex solutions to simple problems...
The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.

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Re: Certified idea for a repairable heavy duty power supply

Post by Ready. » Fri Jan 19, 2018 8:20 am

In the end having a PSU with just the transformer to have it certified did not work out. I will instead stick to the design of a transformer at 50/60Hz as described here:
so far I made 7-8 units delivering up to 3.5A at 5V. The nice thing is that using DC-DC converters provide a much lower ripple than AC-DC converters.
For ex Meanwell RS-15~5 datasheet states a ripple of 80mV https://www.tme.eu/it/Document/510a351c ... 20FULL.pdf
which is much more than what I get from using XL4015 DC-DC board with added output caps, I get 35 mV at 3A.

I have now developed a 5A from 5V version of my PSU using two parallel XL4015, in load sharing mode, so they always share the same current. Even there the ripple is around 35-40mV at 5A. So quite nice.

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