Capacitors » Historie » Version 23
Maximilian Seesslen, 14.01.2026 15:41
| 1 | 1 | Maximilian Seesslen | h1. Capacitors |
|---|---|---|---|
| 2 | |||
| 3 | 2 | Maximilian Seesslen | On the Oszi no impact could be seen at all. |
| 4 | 3 | Maximilian Seesslen | Bei 100Hz empfieht Copilot: 4700–6800 µF. At the moment it's 250Hz |
| 5 | |||
| 6 | 15 | Maximilian Seesslen | 1Khz, 0,350A: 3,5mF. (0,1V Zielwelligkeit) |
| 7 | |||
| 8 | 7 | Maximilian Seesslen | Power measurement is not possible when PWM pulses are visible on input. Or is ADC slow enough? |
| 9 | 3 | Maximilian Seesslen | |
| 10 | 10 | Maximilian Seesslen | At the moment 47µ 6,3x7,7mm; is used, factor 100. |
| 11 | 4 | Maximilian Seesslen | |
| 12 | 2 x 3300µF in series results in 1650µF. |
||
| 13 | 6 | Maximilian Seesslen | 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 |
| 14 | 1 | Maximilian Seesslen | THT gehen bis 4,7mF, sind aber riesig. Smallest 1,5mF still has diameter of 10mm. |
| 15 | 7 | Maximilian Seesslen | |
| 16 | Tantal haben bei so hohen Spannungen viel weniger Kapazität. |
||
| 17 | 1 | Maximilian Seesslen | |
| 18 | 16 | Maximilian Seesslen | 1000ms/250hz=4ms |
| 19 | 1000ms/500hz=2ms |
||
| 20 | 1000ms/1000hz=1ms |
||
| 21 | 10 | Maximilian Seesslen | |
| 22 | 9 | Maximilian Seesslen | C=(I*t)/(Delta_V) |
| 23 | 1 | Maximilian Seesslen | (0,35*0,004)/3,6=390µF |
| 24 | 10 | Maximilian Seesslen | 1V: 3,8mF |
| 25 | |||
| 26 | Copilot: |
||
| 27 | C=0,350*0,002/2=700µF |
||
| 28 | |||
| 29 | 15 | Maximilian Seesslen | h2. RC-Glied am Shunt |
| 30 | |||
| 31 | 10 | Maximilian Seesslen | RC-GLied:1K, 10µF = R*C = 10ms |
| 32 | 11 | Maximilian Seesslen | |
| 33 | "Filter":https://www.st.com/resource/en/application_note/an4304-how-to-filter-the-input-of-a-highside-current-sensing-stmicroelectronics.pdf |
||
| 34 | 12 | Maximilian Seesslen | |
| 35 | (1/(2*PI*2*10Ohm*0,00002F)) = 400Hz |
||
| 36 | |||
| 37 | qalc "(1/(2*PI*2*10*0,00002))" |
||
| 38 | 13 | Maximilian Seesslen | |
| 39 | 1 | Maximilian Seesslen | 2x22µF should do the job; 180Hz |
| 40 | |||
| 41 | h2. LC-Glied am Stromregler-Eingang |
||
| 42 | 16 | Maximilian Seesslen | |
| 43 | h2. Conclusion |
||
| 44 | |||
| 45 | either |
||
| 46 | 17 | Maximilian Seesslen | * 4x470µF SMD -Ø12,5x13,5mm -> 1880µF |
| 47 | 19 | Maximilian Seesslen | * -2*1mF THT Ø12,5x25mm; -> 2mF- |
| 48 | * The 6,3mm caps can be up to 100µF; make it 220uF/10mm |
||
| 49 | * 690µF per LDB in total |
||
| 50 | |||
| 51 | LDB ist schon THT, 20mm breit, 12,2mm hoch. |
||
| 52 | 21 | Maximilian Seesslen | Strom-Buchse auch nur 12,0mm |
| 53 | 23 | Maximilian Seesslen | Der kleinste 1mF THT ist 20mm hoch, der kleinste 470µF TFT ist 12,5mm hoch bei Ø12,52mm. |
| 54 | Der kleinste 470µF SMD ist 13,5mm bei Ø12,5 |