Capacitors » Historie » Revision 16
Revision 15 (Maximilian Seesslen, 14.01.2026 13:31) → Revision 16/27 (Maximilian Seesslen, 14.01.2026 14:42)
h1. Capacitors
On the Oszi no impact could be seen at all.
Bei 100Hz empfieht Copilot: 4700–6800 µF. At the moment it's 250Hz
1Khz, 0,350A: 3,5mF. (0,1V Zielwelligkeit)
Power measurement is not possible when PWM pulses are visible on input. Or is ADC slow enough?
At the moment 47µ 6,3x7,7mm; is used, factor 100.
2 x 3300µF in series results in 1650µF.
Biggest 50V-Cap is 1mF (SMD); "List":https://www.tme.eu/de/katalog/elektrolytische-kondensatoren-smd_112341/?onlyInStock=1&assortmentType=internal¶ms=118:1438381,1497186,1438385,1713901,1497187,1438332;120:1437210,1437163,1620883,1529492,1437177,1437183,1511884&productListOrderDir=ASC&productListOrderBy=1000014
THT gehen bis 4,7mF, sind aber riesig. Smallest 1,5mF still has diameter of 10mm.
Tantal haben bei so hohen Spannungen viel weniger Kapazität.
1000ms/250hz=4ms 1000/250=4ms
1000ms/500hz=2ms 1000/500=2ms
1000ms/1000hz=1ms 1000/1000=1ms
C=(I*t)/(Delta_V)
(0,35*0,004)/3,6=390µF
1V: 3,8mF
Copilot:
C=0,350*0,002/2=700µF
h2. RC-Glied am Shunt
RC-GLied:1K, 10µF = R*C = 10ms
"Filter":https://www.st.com/resource/en/application_note/an4304-how-to-filter-the-input-of-a-highside-current-sensing-stmicroelectronics.pdf
(1/(2*PI*2*10Ohm*0,00002F)) = 400Hz
qalc "(1/(2*PI*2*10*0,00002))"
2x22µF should do the job; 180Hz
h2. LC-Glied am Stromregler-Eingang
h2. Conclusion
either
* 4x470µF SMD -> 1880µF
* 2*1,5mF THT -> 3mF
On the Oszi no impact could be seen at all.
Bei 100Hz empfieht Copilot: 4700–6800 µF. At the moment it's 250Hz
1Khz, 0,350A: 3,5mF. (0,1V Zielwelligkeit)
Power measurement is not possible when PWM pulses are visible on input. Or is ADC slow enough?
At the moment 47µ 6,3x7,7mm; is used, factor 100.
2 x 3300µF in series results in 1650µF.
Biggest 50V-Cap is 1mF (SMD); "List":https://www.tme.eu/de/katalog/elektrolytische-kondensatoren-smd_112341/?onlyInStock=1&assortmentType=internal¶ms=118:1438381,1497186,1438385,1713901,1497187,1438332;120:1437210,1437163,1620883,1529492,1437177,1437183,1511884&productListOrderDir=ASC&productListOrderBy=1000014
THT gehen bis 4,7mF, sind aber riesig. Smallest 1,5mF still has diameter of 10mm.
Tantal haben bei so hohen Spannungen viel weniger Kapazität.
1000ms/250hz=4ms 1000/250=4ms
1000ms/500hz=2ms 1000/500=2ms
1000ms/1000hz=1ms 1000/1000=1ms
C=(I*t)/(Delta_V)
(0,35*0,004)/3,6=390µF
1V: 3,8mF
Copilot:
C=0,350*0,002/2=700µF
h2. RC-Glied am Shunt
RC-GLied:1K, 10µF = R*C = 10ms
"Filter":https://www.st.com/resource/en/application_note/an4304-how-to-filter-the-input-of-a-highside-current-sensing-stmicroelectronics.pdf
(1/(2*PI*2*10Ohm*0,00002F)) = 400Hz
qalc "(1/(2*PI*2*10*0,00002))"
2x22µF should do the job; 180Hz
h2. LC-Glied am Stromregler-Eingang
h2. Conclusion
either
* 4x470µF SMD -> 1880µF
* 2*1,5mF THT -> 3mF