What is a Power Diode?

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.

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