Don Smith LTspice Sim

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duff

Don Smith LTspice Sim « on: 2012-03-11, 04:01:21 »

Newbie

Posts: 33

All,

I need help with a Don Smith LTspice sim I've been working on.

The problem is that it is showing a COP of 1.128

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Don Smith LTspice Sim

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Don Smith LTspice Sim

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don_smith_table_top-ou.net.txt (1.97 kB - downloaded 866 times.)

« Last Edit: 2012-03-11, 06:27:32 by duff »

EMdevices	Re: Don Smith LTspice Sim « Reply #1 on: 2012-03-11, 06:02:56 »
Hero Member Posts: 1625	why don't you integrate from 5 to 6 ms. Starting at 0 s is before steady state has been reached.

duff

Re: Don Smith LTspice Sim « Reply #2 on: 2012-03-11, 06:10:29 »

Newbie

Posts: 33

EM,

I'm starting the integration at 4ms.
  .tran 0 10.6m 4m

If I start at 0s I get a COP of 1.059

   pin: INTEG(v(vs)*i(v1))=-13.0589 FROM 0 TO 0.0106
   pout: INTEG(v(vout)*i(rl))=13.8418 FROM 0 TO 0.0106
   cop: (pout/pin)=-1.05995

Edit1:

I think you misinterpreted what I was saying.
The efficiency greater than 100%

Yes I am delaying recording of data 40ms to overcome the initial power draw establishing a somewhat steady state condition.

I am trying to get the simulation back to realistic conditions.

Edit2:
In case anyone is interested, I figured this out.

Determining the input impedance and setting the Source series resistance equal to that value corrected the problem. It now show realistic results.

« Last Edit: 2012-03-12, 12:08:52 by duff »