Electric current being alternated with continuous part

  • Thread starter DaTario
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Summary
In which scenario a current may exhibit alternated and continous character together?
Summary: In which scenario a current may exhibit alternated and continous character together?

Hi All,

I would like to know in which scenario an electric current may exhibit alternated and continous character?
Something like $$ I(t) = I_0 \sin (\omega t) + I_1 $$.
 
A simple example is ripple on the DC output from a poorly smoothed power supply. The output is DC with AC superimposed on it. Another is the DC supply to the LNB on a satellite TV dish, which is passed on the same coaxial cable bringing the signal (which is AC) to the receiver.
 
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A simple example is ripple on the DC output from a poorly smoothed power supply. The output is DC with AC superimposed on it. Another is the DC supply to the LNB on a satellite TV dish, which is passed on the same coaxial cable bringing the signal (which is AC) to the receiver.
what he said (very small).jpg
 

berkeman

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I would like to know in which scenario an electric current may exhibit alternated and continous character?
Another example of a DC current with an AC component (although not sinusoidal) is the i(t) current through the inductor of a "Buck" topology DC-DC converter. The average of the triangular current waveform is the average output current of the DC-DC converter (at the output voltage which is being regulated by the converter), and the ripple current depends on the switching frequency and the value of the inductance...



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tech99

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Another example is an analogue TV signal, which is unidirectional and so has a DC component.
 
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Thank you all, very much!
 

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