Power devices | Power electronics

Power Devices

Introduction of power device

• Power semiconductor diodes are similar to low power pn-junction diodes.
• Power transistors are identical with npn or pnp signal transistors.
• Power diodes are constructed with n^- layer, this n^- layer is called drift region, which exists between p⁺ layer and n⁺ layer. The p⁺ and the n⁺ layers are known as anode, and cathode (substrate) respectively. The n^- layer is used to support a large blocking voltage.
• This n^- layer is not present in low power diodes or signal diodes.

Note:  

• The low power diodes and transistors are also known as signal diodes and signal transistors respectively.

Difference between Power semiconductor and Signal semiconductor

Power semiconductor diode and transistor	Signal semiconductor diode and transistor
The voltage, current and power ratings of these devices are high.	The voltage, current and power ratings are these devices are low.
Power devices operate at lower switching speed.	Signal devices operate at higher switching speed.
Power semiconductors are used in power electronic circuits.	Signal semiconductor are used in signal electronic circuits.

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