In this article, we will discuss about compression of different Power Electronics Switches like; SCR (Silicon Controlled Rectifier), Power BJT (Bipolar Junction Transistor), Power MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and IGBT (Insulated Gate Bipolar Transistor).

Comparison of SCR, Power BJT, Power MOSFET, IGBT

Sr No	Parameter	SCR	Power BJT	Power MOSFET	IGBT
1	Operating frequency	400 to 500 Hz	10 kHz	100 kHz	10 kHz
2	On-state voltage drop	< 2 volts	<2 volts	4-5 volts	3 volts
3	Trigger circuit	Current controlled need single pulse to turn-on.	Current controlled needs continuous base drive.	Voltage controlled needs continuous gate drive.	Voltage controlled need continuous gate drive.
4	Snubber	Necessary (unpolarized)	Necessary (polarized)	Snubber can be eliminated. If used a polarized snubber is used.	Snubber can be eliminated. If used a polarized snubber is used.
5	Applications	DC motor drives, inverters, rectifiers.	UPS, SMPS, Static VAR systems, AC motor control,	AC motor control, SMPS	SMPS, BLDC drives AC motor control UPS.
6	Maximum VI Rating	10 kV/ 5000 A	2 kV/ 1000 A	600 V/ 200 A	1500 V/ 400 A
7	Type of Device	Minority carrier	Minority carrier	Majority carrier	Minority carrier
8	Voltage or Current Controlled	Current controlled	Current controlled	Voltage controlled	Voltage controlled
9	Communication Circuit	Necessary	Not Necessary	Not Necessary	Not Necessary
10	Blocking Capacity	Symmetrical	Asymmetrical	Asymmetrical	Asymmetrical
11	Temperature Coefficient	Negative	Negative	Positive	Flat
12	Thermal Runaway	Possible	Possible	Not Possible	Not Possible
13	Parallel Operation	External equalizing circuit is necessary.	Equalizing circuit required.	Easy to parallel.	Easy to parallel.
14	Symbol

 

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