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Old 1st November 2010, 02:04 AM   #11
wdcw is offline wdcw  Australia
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No worries, can I still just sum the two currents together seeing that the circuit is Inductive & Capacitive.


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Old 1st November 2010, 02:16 AM   #12
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When you sum the inductor current with the capacitor's, remember to use vectors as their phases won't match LTSpice will do this for you though - just mouse over the voltage source and a current symbol will appear - click to graph the overall current from that source.
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Old 1st November 2010, 02:37 AM   #13
wdcw is offline wdcw  Australia
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abraxalito

I need to find the total current through the Capacitor when a 1050Hz signal is injected into a 230V signal.
So I am not sure a phasor diagram is going to find that, is it?

I have no value for L so I am not sure what IL or XL is.

Basically two voltages with different frequencies when mixed, do there currents add together?

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Old 1st November 2010, 02:48 AM   #14
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You have the C value, that's 4.9uF. Given that the question isn't asking about current into the inductive part (which means both phases are staying at 90), you can add together the current at 50Hz and that at 1050Hz. I haven't tried two different frequency sources in LTSpice myself, don't know if that works.

A phasor diagram when there's only currents in the same phase seems a bit overkill To answer your final question - its 'yes' when the currents are in phase and the load is a linear one (like a capacitor as you've got here).
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Old 1st November 2010, 02:56 AM   #15
wdcw is offline wdcw  Australia
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Yes, I see.

Thanks for your time abraxalito, it's greatly appreciated.

Thanks Again

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Old 1st November 2010, 03:02 AM   #16
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You're welcome, its blown a cobweb or two out of my rusty brain in the area of phasors...
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