General > General Technical Chat
What are your expectations from an adjustable power supply?
rcnkk:
Hello, I want to make an portable adjustable power supply that works with usb pd like mdp xp.
I'd like to get your thoughts on what you can expect from a variable power supply.
Max Voltage
Max Current
Connectivity (e.g. Phone or desktop app)-
Max price
And any other features you can think of.
nctnico:
Some minimum requirements:
- Not having power on / power off overshoots is extremely important where it comes to adjustable power supplies. You should be able to pull the plug without getting an overshoot on the output. Same for plugging in: when the output is supposed to be disabled, it should not show anything
- Output enable / disable button
- Programmable power-up setting (voltage, current limit and output state) so it can be used in a more permanent test setup.
Nice to have: high & low current measurement range. It is very handy to have single digit uA accuracy for currents below -say 20mA-.
Brumby:
You might get some ideas from Dave's own efforts along these lines: https://www.eevblog.com/projects/usupply/
Karel:
Must withstand reverse current & voltage (e.g. from a connected battery), no matter the output is enabled or not.
At home I have a Peaktech 6225A that blows up immediately if you connect a battery with the output disabled :palm:
mendip_discovery:
Max Voltage = 5 kV AC
Max Current = 100 A
Connectivity (e.g. Phone or desktop app) - Connect to a phone and access via a cloud-based website.
Max price = £20
And any other features you can think of. = Use connectors that nobody else uses. Sod thermal EMF.
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