Products > Test Equipment
DP100 PD-Power Supply 100Watt [0-30.00V / 0-5.000A) [∼50$]
Evi:
Sorry, it's even worse.
Evi:
For me solution is: just short out power MOSFET M1.
Thanks to old Occam.
kasoah:
I am powering my DP100 with a USB C PD, 19V.
Current measurements seem reasonable.
However, when I plug the USB A connection in, the power reported drops quite noticeably.
From around 26W reported to 24W.
Anyone else notice this?
EDIT: Grabbing a USB isolator fixed this. I used one I had on hand: KGUSS Topping HS02 USB2.0 but I'm sure cheaper ones work.
Phil1977:
That´s exactly the problem of the non-isolated output with low-side current measurement.
As soon as you plug in the USB-A connection you create a ground-loop from the DP100 main output to the USB-A output. And all current that flows back by the USB-A cable is not accounted for in the power display.
Using a galvanic isolator is exactly the good solution for this problem. It´d be even better if the DP100 would be galvanically isolated by itself or would have a real common ground for its inputs and outputs.
codingjoe:
Hi there,
I took Scott's idea to use WebHID and started building a proper browser-based interface.
It's still a work in progress, I only managed to plot a power chart. However, that already pretty helpful, since this is missing hardware wise.
I'll try using the next weekend to add proper control to adjust all settings via the browser.
You check it out already, it's open source: https://github.com/codingjoe/DP100-WebApp
I hope you like it!
Cheers!
Joe
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