Hardware » Helios

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&params=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

1000ms/500hz=2ms

1000ms/1000hz=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 -Ø12,5x13,5mm -> 1880µF

* -2*1mF THT Ø12,5x25mm; -> 2mF-

* The 6,3mm caps can be up to 100µF; make it 220uF/10mm

* 690µF per LDB in total

LDB ist schon THT, 20mm breit, 12,2mm hoch. 

Strom-Buchse auch nur 12mm

Der kleinste 1mF THT ist 20mm hoch.