Question 1

What is an Insulated Gate Bipolar Transistor (IGBT), and what advantages does the IGBT provide over both power MOSFET and traditional BJT devices?

 

Question 2

Complete the schematic diagram showing an equivalent circuit for an N-channel IGBT, using an N-channel E-type MOSFET and a PNP bipolar transistor:



 

Question 3

The equivalent circuit for an IGBT - comprised of a MOSFET coupled to a BJT - bears resemblance to a couple of other BJT circuits you may have seen before:



Which of these two paired-BJT circuits most resembles the IGBT equivalent circuit, in terms of what two terminals the control signal voltage must be applied between to turn the device on?

 

Question 4

Draw a complete schematic diagram showing how this IGBT can be used to control a DC motor, at the command of the toggle switch:



Note: the DC power supply voltage is 240 VDC, and the IGBT’s maximum gate-to-emitter control voltage is 20 volts!

 

Question 5

Examine the schematic diagram for this photographic strobe light control system:



Explain its operation, and explain why an IGBT is a good transistor type for this application.

 


Published under the terms and conditions of the Creative Commons Attribution License