二极管是将交流电整流成直流电的电子装置。

Diodes are electronic devices which rectify alternating current to direct current.

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目前电力电子应用领域中，绝大多数的交流电动机驱动逆变器前级都采用了二极管整流器或晶闸管相控整流器。

At present, in the field of power electronics applications, most of the drive systems of AC motors use diode rectifiers and phase-control thyristor rectifiers.

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