Electronics > Repair
18V/3A HY1503 PSU - weird CC/CV behavior while charging battery cells
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iMo:
Here is the "PSU Pulser" (aka "PSU Shorter" in past)..
Rather hot at 18.7V and 1.7A..
40ms active, 300ms off. The load 68ohm/6 active, 330ohm off.
Rising edge on the mosfet's drain 200ns, falling edge 60ns at 18.7V/1.7A.
So we may finetune the PSU's CC/CV now..  :)
iMo:
After a final exercises with ltspice and PSU pulser/shorter below the o'scope pictures when pulsing with 1.65A (set 18.7V max voltage, CC off).
The 470uF original output capacitor replaced with 47uF one..
The pos/neg peaks at the PSU's posts are less than 100ns wide (when zooming in)..
iMo:
..and the final schematics.. case closed..
xavier60:
The narrow spike is likely due to the way the DSO probe is connected to the PSU.
The real response is 4us, a little fast for that design resulting in the slight ringing. It will be fine.
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