Products > Test Equipment
Power Supply: Build or Buy?
tkamiya:
I think buy or make decision is all depending upon one's purpose, interest, and ability. If making one interests you, by all means, make one. Don't forget buying used one either. Older HP power supplies are big and heavy but generates very clean output. I'd choose them over brand-new inexpensive ones. Just for fun, I've purchased a $50 unit from Amazon. Awful build quality and output was full of noise. I wasn't expecting much for the price but even then, it was much worse than my expectations. I sent it back for refund.
What's the use-case for 100V DC power supply? What kind of specifications are you looking for? That one may be a bit trickly. Off the top of my head, I don't know of any that covers that range and even relatively affordable.
Good luck.
Fungus:
--- Quote from: mawyatt on May 10, 2023, 12:29:20 pm ---So true, and one MUST pay attention to such or likely fry the PSU!!
--- End quote ---
It won't be easy, there's usually a big capacitor across the output that will absorb it.
--- Quote from: mawyatt on May 10, 2023, 12:29:20 pm ---Relays are basically solenoids electromagnetically, and should always utilize a current recovery diode to give the interrupted current a nice place to go as it decays, Ldi/dt can and will wreak havoc with things!!
--- End quote ---
I like to use LEDs so you can see them flash when the spikes hit.
Being able to see the spikes really helps teach people the need for protection.
james_s:
--- Quote from: Fungus on May 10, 2023, 12:45:55 pm ---It won't be easy, there's usually a big capacitor across the output that will absorb it.
--- End quote ---
Not in a bench supply, a big capacitor across the output reduces the effectiveness of current limiting in the event of a short circuit.
In ~35 years of playing with electronics I have never managed to damage a PSU by playing with inductive loads though.
tautech:
--- Quote from: mawyatt on May 10, 2023, 12:29:20 pm ---
--- Quote from: tautech on May 10, 2023, 04:18:57 am ---
--- Quote from: br4n_d0n on May 10, 2023, 03:36:22 am ---No one has touched on the electromagnet part; it will probably be dependent on its specifications, but I was curious if it's more voltage or current dependent.
--- End quote ---
Back EMF can be a huge problem and it's wise when using a PSU for powering such to take precautions to avoid subjecting the PSU outputs to back EMF. Regen motors also present the same issues and even reverse voltage protection can be exceeded and output stages damaged.
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So true, and one MUST pay attention to such or likely fry the PSU!!
Relays are basically solenoids electromagnetically, and should always utilize a current recovery diode to give the interrupted current a nice place to go as it decays, Ldi/dt can and will wreak havoc with things!!
We are working with a controller for a high pressure DC motor that requires ~50 amps, so you can bet we are paying attention to back EMF as this can send the PS (and maybe yourself) to the grave if not properly attend too :o
Best,
--- End quote ---
What PSU are you using for that development Mike ?
Have you looked at the SPS5000X range ?
I've been using my 40V 60A unit for charging solar array batteries lately....a remote installation so powered with a genset.
mawyatt:
--- Quote from: tautech on May 10, 2023, 08:46:14 pm ---
What PSU are you using for that development Mike ?
Have you looked at the SPS5000X range ?
I've been using my 40V 60A unit for charging solar array batteries lately....a remote installation so powered with a genset.
--- End quote ---
The Korad KWR102, but it's not enough for the higher current pump motors which may need up to 50 amps! We should have more data on the motors soon to help with the decision, and the SPS5000X might be a candidate.
Best,
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