Diode Capacitor Circuits

I have to ask a question about the capacitor, it would be nice if you helped?

In the full wave rectifier rectifier circuit, the capacitor after the diode, it helps smooth the output current, it only charges with DC and discharge with AC. But the Negative pole of the capacitor is connected to ground, so it will only discharge DC upwards towards the load, great. But wouldn't the output be half a positive wave? since the negative is zero? and wouldn't be in the shape of a sine wave since its AC? How does it have this output form? http://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/RC_Filter.png/400px-RC_Filter.png i don't get it

That is sometimes known as a "reservoir capacitor" if I remember correctly.

Input = sine wave, half the wave positive, half the wave negative. Full-wave rectifier means every "half" of the wave is positive. A reservoir capacitor (aka smoothing capacitor) is placed after the bridge to help smooth the peaks out and provide a more constant DC voltage.

So how does it work? As the voltage rises from 0, the capacitor begins to be "charged". At some point it reaches full charge. As the voltage from the bridge rectifier begins to drop (ie the wave returns towards 0v), the capacitor stops being charged and begins to discharge... supplying the load with positive current. As the wave climbs back towards the peak, the capacitor will stop discharging and go back to being charged.

A capacitor does not discharge AC... it discharges DC only. It reacts to AC differently at different frequencies.... from nearly open to closed.... but it discharges DC only.

Saul

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