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Rectifier Diode
Feb 01, 2018

Rectifier diode A semiconductor device used to convert alternating current into direct current. The most important characteristic of diodes is unidirectional conductivity. In the circuit, the current can only flow from the anode of the diode and the cathode flows out. It usually contains a PN junction, with positive and negative terminals. Its structure as shown. The carriers in P region are holes, and the carriers in N region are electrons, forming a certain barrier between P region and N region. The applied voltage causes the P region to be at a positive voltage relative to the N region, and the barrier at the barrier is reduced. The storage carriers are generated near both sides of the barrier and can pass a large current with a low voltage drop (typically 0.7 V) Turn on the state. If you add the opposite voltage, so that the barrier increases, can withstand high reverse voltage, through a small reverse current (known as the reverse leakage current), known as the reverse blocking state. Rectifier diode has obvious unidirectional conductivity. Rectifier diodes can be made of semiconductors such as germanium or silicon. Silicon rectifier diode breakdown voltage is high, the reverse leakage current is small, high temperature performance is good. High-voltage high-power rectifier diodes are usually made of high-purity silicon (more easily reverse doping breakdown). The junction area of this device larger, through a larger current (up to thousands of A), but the working frequency is not high, generally less than tens of kHz. Rectifier diode is mainly used for a variety of low-frequency half-wave rectifier circuit, if necessary to achieve full-wave rectifier connected rectifier bridge should be used.

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