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Rectifier Diode
Apr 16, 2018

Rectifier diode is a semiconductor device used to transform alternating current into direct current. The most important feature of diodes is the unilateral conductivity. In the circuit, the current flows from the anode of the diode to the cathode. Usually it contains a PN junction with two terminals, anode and cathode. Its structure is shown as below:

Diode Structure


Diode Symbol


Rectifier diodes are usually planar silicon diodes, which are used in all kinds of power supply rectifier circuits. When rectifying diode is used, we should consider the maximum rectifying current, the maximum reverse working current, the cut-off frequency and the reverse recovery time. The rectifying diode used in the common series voltage regulated power circuit requires that the reverse recovery time of the cut-off frequency is not high. As long as the maximum rectifying current and the maximum reverse working current are selected according to the requirements of the circuit, the rectifying diode is in conformity with the required rectifier diode. For example, the 1N series, the 2CZ series, the RLR series and so on.

The silicon rectifier diode has high reverse breakdown voltage, small leakage current and good high temperature performance. Usually, high-voltage and high-power rectifier diodes are made of high-purity monocrystalline silicon, which is easy to reverse breakdown when doped more. This device has a large junction area and can pass a large current, but the frequency of the device is not very high, usually below the ten kilo Hertz (KHZ).

The diode's PN junction has a one-way conduction characteristic, and the AC becomes pulsating DC. The current of rectifier diode is large, and most of the diodes are used for surface contact material encapsulation.