#garfield Logs

May 06 2023

07:35 AM polprog: I did more simulations of my neg buck converter
07:47 AM polprog: Looks like I will need a 1:10 transformer
07:47 AM polprog: https://0x0.st/HZAI.png
10:43 AM rue_mohr: nice I was looking at that
10:48 AM rue_mohr: if you zoom in 200% on that chart, is it ringing?
11:19 AM polprog: It might be a render issue, or a simulation problem but it looks as if its ringing
11:19 AM polprog: the ringing char is the SWE voltage
11:19 AM polprog: maybe its just duty cycle becoming shorter and shorter, ill rerun the sim and look at that. good catch
11:20 AM polprog: also need to add a cap on the feedback voltage, 100n or something
11:23 AM rue_mohr: often there will be a capacitor to cause the step responce to result in an underdamped settling.
11:23 AM rue_mohr: C RC DRC
12:17 PM polprog: ill have to think about it
12:17 PM polprog: i want to run as many simulations to avoid it blowing up..
12:18 PM rue_mohr: The ring , to my understanding, is mostly triggered by leakage inductance, I dont know what the simulator might put in for that
12:19 PM rue_mohr: what to work on today
12:19 PM rue_mohr: I should work on the cnc
12:20 PM rue_mohr: and stripping down that next printer
12:20 PM rue_mohr: and cleaning up the pulley casting
08:25 PM rue_mohr: well I got a bunch of gardening done
08:26 PM rue_mohr: realized that the pulley blanks aren't good for 10:1, I can do 5:1 and make a 3 stage reducer