Re: power supply discharge

On a sunny day (Sat, 28 Sep 2024 15:28:01 +0100) it happened Clive Arthur
<clive@nowaytoday.co.uk> wrote in <vd93ph$19pt8$1@dont-email.me>:

On 27/09/2024 16:07, john larkin wrote:

 
Given a benchtop power supply, you can turn the voltage up and then
down, and it goes down. Most have a substantial amount of output
capacitance, and can be driving an external cap too. So something
pulls the output down.
 
I guess that there are no standards for this, but I've never seen a
supply that just hangs high when it's cranked down.
 
I'm designing some programmable multi-channel power suplies and that
is one of many tangled issues in the project.

>
My ancient Farnell bench supply has a voltage adjustment pot and moving
coil voltmeters.  The 'up' speed is much quicker than the 'down' speed.

Same yor my home designed benchtop supply
Discharge, with no load, (voltage of the output cap) is via the output voltage sensing resistors,
slower than the charge.
 https://panteltje.nl/panteltje/pic/pwr_pic/power_box_diagram_img_1817.jpg
 https://panteltje.nl/panteltje/pic/pwr_pic/
Been working great since 2010, used every day,
also to charge all sort of batteries.