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Periodic current reversal
Additional recommended knowledge
The earliest (and simplest) PCR arrangements simply use an offset AC (sine wave) voltage where the potential will reverse for a time each cycle (e.g. a half wave rectifier with leaky diode). Modern PCR equipment uses electronic switching to do the reversal allowing a square wave form with precise control of the timing and currents for forward and reverse currents. Often PCR cycles will incorporate zero current phases as well (this could be seen as a variation on pulse charging adding the short reversals during rest periods).
PCR has been found to improve the physical properties of electrolytically deposited metals (the reverse current preferentially removes dendrites) and may also reduce polarization effects (can improve purity of product and cell efficiency). The reverse conduction may be quite small compared to the forward - for instance a typical modern PCR battery changer might only reverse the current one or a few few times a second for a few milliseconds at a current between 10% to 300% of the forward current but because of the short time the reverse charge conduction is from no more than 2% of the forward.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Periodic_current_reversal". A list of authors is available in Wikipedia.|