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OPA818: OPA818

Peter Partridge
Intellectual 290 points
Part Number: OPA818
Other Parts Discussed in Thread: TINA-TI

Hello,

Hope someone can help with this.

I have been getting use to using TINA but am having a problem with power measurement:-

I have attached the circuit, if it is run in transient analysis you will see that PM1 measures the instantaneous power of R3, which appears to be ~ 0.2W.

I want to be able to measure the average power. On the net there are instructions:-

Select Analysis/AC Analysis/Calculate nodal voltages from the menu and then click the power meter with the probe. A table is supposed to appear showing effective power among other things which does not show up!

The only thing that does show up is a display of the power near the watt-meter symbol which is 0W which clearly disagrees with the Transient result!

Thanks.

Best regardsOPA818-1.TSC,

Peter

  • 0
    Guru 140200 points

    Hi Peter,

    change the signal of "VG1" from "Square wave" to "Sine wave".

    Kai

  • 0 in reply to kai klaas69
    Intellectual 290 points

    Hi Kai,

    Thanks for your response again.

    Hmmm, yes it does now show the power dissipated in the resistor when the source is sinusoidal. However the dialog window showing:-

    effective power ( P )

    reactive power ( Q )

    apparent power ( S )

    phase (  )

    power factor ( cos )

    does NOT show up.

    I can approximate the squarewave with multiplying the 35V x 2^0.5 but the waveforms and the power dissipated is clearly NOT the same as when driven by a squarewave.

    Clearly this is a limitation in the algorithm - Microcap doesn't have this problem. Not sure about other simulators.

    Apparently one can use the post processor to get a more accurate result. Do you know how to use the post processor or any other way to get a more accurate result?

    Thanks.

    Peter

  • 0 in reply to Peter Partridge
    Guru 140200 points

    Hi Peter,

    I think this an issue because the free TINA-TI version isn't a full version of TINA.

    The post processor is a bit explained in this TI's "stability" learning video:

    Kai