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What is a Power Diode?

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What is a Power Diode?

Power Diode definition

Based on semiconductor PN, its on-off and off-off are completely determined by the voltage and current it undergoes in the main circuit, which can realize the function of positive on-off and reverse cutoff, and the power diode is an uncontrollable device.

How Power Diodes work

When the PN junction is applied with a forward voltage, that is, P→+, N→-, the external electric field is opposite to the internal electric field, and the diffusion motion is greater than the drift motion, resulting in a diffusion current.

电力二极管基本结构_修复后.jpeg

Working status of the PN junction

Positive connection status of the PN junction
Reverse cutoff state of the PN junction
Reverse breakdown of PN junction

Basic characteristics of Power Diodes

Static characteristic
Dynamic characteristic

Main parameters of Power Diodes

Forward mean current
Forward pressure drop
Reverse repeat peak voltage
Maximum working junction temperature
Reverse recovery time
Inrush current

Classification of Power Diodes

Plain diode
Fast recovery diode
Schottky diode

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