June
2004, Issue 167
Test Your EQ:
Each
month, Test Your EQ presents some basic engineering
problems for you to test your Engineering Quotient.
What's your EQ?
|
Problem
1— How
does an insulated gate bipolar transistor (IGBT) work?
Draw the equivalent circuit.
Answer
Problem
2— What is the basic topology of a switch
mode buck regulator?
Answer
Problem 3—What
is the basic topology of a switch mode boost regulator?
Answer
Problem
4—What
is the following circuit?
Answer
Problem
5— What
is the magnetizing current of a transformer?
Answer
Problem
6—What is downside of building a transformer
with a large primary inductance?
Answer
Problem
7—When driving a transformer with a square wave,
such as in switching power converter equipment, what is
the shape of the magnetizing current waveform?
Answer
Problem
8—One way to drive the transformer primary
in a switchmode power converter is to connect the DC input
to the center tap and alternately pull the ends of the
winding to ground with power transistors, as shown below.
This approach has the advantage of simplicity, but there
some pitfalls to watch out for. For example, what is the
voltage rating required on the transistors? Why?
Answer
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