NEED HELP NOW! reg. loss in induktor. - diyAudio
 NEED HELP NOW! reg. loss in induktor.
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 6th January 2005, 03:49 AM #1 diyAudio Member     Join Date: May 2003 Location: AARHUS. DK NEED HELP NOW! reg. loss in induktor. If an SMPS is operated in continuous mode the current in the output induktor will be a DC-current with an small superimposed AC-ripple. When calculating the loss in the induktor I would guess that I should add the loss for the DC-current and the loss for the AC-ripple? The DC-loss is a function of the DC-resistance and this resistance is usually very small. The AC-loss is a function af eddy-current-resistance in the inductor and this "resistance" is many times larger. My problem is: When calculating the loss, do I use formula 1) or 2) 1): Ploss = Rdc*Idc^2 + Reddy*Iac^2 2): Ploss = Rdc*(Idc+Iac)^2 + Reddy*(Idc+Iac)^2 Please help me, and please do it now! -I have an exam in 4 hours and 10 minutes.... Troels __________________ Need more time...
 6th January 2005, 06:39 AM #2 diyAudio Member   Join Date: May 2002 Location: Switzerland Hi Troels From a quick shot at it I'd say it is: 3): Ploss = Rdc * (Idc^2 + Iac^2) + Reddy * Iac^2 But don't sue me if it is wrong. Regards Charles
 6th January 2005, 11:20 AM #3 diyAudio Member     Join Date: May 2003 Location: AARHUS. DK Thanks I figured it out. BTW my grade was 11 (0 to 13 scale)! Troels __________________ Need more time...

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