Using Capacitors as Energy storage device - eliminating the phase differ between voltage & current

[HRITHU O A]

I constantly read that capacitors provide reactive power. So how are they used instead of a battery? I mean in a battery the voltage and current are in the same phase. How is the phase change between the voltage and current in a capacitor eliminated without using an inductor, to use capacitor as a power source?

 

[MikeMl]

I constantly read that capacitors provide reactive power. ...

... in an AC circuit!

 

[AnalogKid]

There are a few things wrong with your information.

I constantly read that capacitors provide reactive power.

No. A capacitor provides a reactive impedance. How it behaves in a circuit (any circuit) depends entirely on the circuit.

So how are they used instead of a battery?

A battery stores charge in a different manner than does a battery, but charge is charge. In terms of comparing it to a battery of the same physical size, a capacitor holds less charge, can be charged to a high voltage, and has a very steep discharge curve. The good news is that it can be recharged almost instantly.

I mean in a battery the voltage and current are in the same phase.

This is an incorrect expansion of a narrow condition. The phase of the voltage and current are set by whatever the load is, not by the power source. If the load is a simple resistor, the voltage and current are in phase no matter what the source is; battery, capacitor, generator, whatever. If the load is a capacitor, then while it is charging from a DC source the current and voltage are not in phase no matter what the source is.

How is the phase change between the voltage and current in a capacitor eliminated without using an inductor, to use capacitor as a power source?

See above. Phase change in the way you mean it does not exist.

ak

 

[HRITHU O A]

Thank You guys. Guess I have some more deep reading to do.