NEED HELP NOW! reg. loss in induktor.

TroelsM · 6th January 2005, 04:49 AM

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

phase_accurate · 6th January 2005, 07:39 AM

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

TroelsM · 6th January 2005, 12:20 PM

I figured it out. BTW my grade was 11 (0 to 13 scale)!

Troels

6th January 2005, 04:49 AM	#1
TroelsM 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 = RdcIdc^2 + ReddyIac^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 __________________ Visit my blog at: http://kofoedmejer.squarespace.com/ and have a look.

6th January 2005, 12:20 PM	#3
TroelsM diyAudio Member Join Date: May 2003 Location: AARHUS. DK	Thanks I figured it out. BTW my grade was 11 (0 to 13 scale)! Troels __________________ Visit my blog at: http://kofoedmejer.squarespace.com/ and have a look.

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6th January 2005, 07:39 AM	#2
phase_accurate 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

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