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In Reply to: RE: Resistor dissipation Question posted by timp on September 15, 2012 at 20:26:39
An important fact that nobody has mentioned... the RMS current through this resistor is considerably higher than the total DC current! The current waveform here is not a sine wave - it has a higher peak value due to the charging current for C1. Another to way to look at it - the resistor carries the DC output current PLUS the ripple current in the capacitor.
PSUD will have an RMS value for the resistor in the table - THIS is the figure you must use to calculate dissipation. It's higher than you think...
Follow Ups:
Hi
Thanks for. your input. This psu is designed after dynamo St 70. C1 47uf I think is not needed at that value. I can lower it to 5 or so to lower the b+???
then I can leave. C2 value as is at 23
I will. Play around.
You can very effectively use PSUD2 to see exactly what sort of voltage difference there will be between 47 uF and 5 uF as the input filter. Go for it Tim.Jeff
Edits: 09/17/12
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