Page 78 - Electrician - TT (Volume 2)

ELECTRICIAN - CITS

Table 1
S.No. Parameter SCR BJT MOSFET IGBT
1 Symbol

2 Triggered i.e Triggered or Linear trigger Linear trigger Linear trigger
latching or latching device
linear
3 Type of Majority carrier Bipolar device Majority carrier Majority carrier
carriers in device device device
device

4 Control of Gate has no Base has full control Gate has full control Gate has full
gate or base control once control
turned on control
5 On-state drop < 2 Volts < 2 Volts < 4-6 Volts < 3.3 Volts
6 Switching 500 Hz 10 kHz up to 100 kHz 20 kHz
frequency
7 Gate drive Current Current Voltage Voltage

8 Snubber Unpolarized Polarized Not essential Not essential
9 Temperature Negative Negative Positive Approximately
coefficient flat, but positive
at high current
10 Voltage 10 kV/4kA 2 kV/4kA 1 kV/50 A 1.5 kV/400 A
and current
ratings
11 Voltage Symmetric and Asymmetric Asymmetric Asymmetric
blocking
capability
12 Application AC to DC DC to AC converters, DC choppers, DC to AC
converters, induction motor low powers, UPS, converters, AC
AC voltage drives, UPS, SMPS, SMPS, brushless motor drivers
controllers, Choppers DC motor drives UPS choppers,
electronic circuit SMPS etc,.
breakers

65

CITS : Power - Electrician & Wireman - Lesson 60-69