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# i need answer for problem 4

ZID:
ELE 440/540 Exam 1 Fall 2019
Page 5 of 7
Problem 4
(Seven points if only the correct answer is circled.
Four points if two answers are circled and one is correct.)
800 W -
Ploss
Pcond
te,on= 100 ns
- 10 HS
T
40 us
The above diagram represents transistor power losses in a switching power pole. The
following values are known:
Wcond = 100 HJ
Energy lost when the transistor is conducting
WTotal = 250 u.J
Energy lost in one cycle
a) What is the energy lost when the switch turn on (Won)?
i) 1800 . 100n
ii)
800 . 100n
iii)
800
2
2 . 100n
iv) 2. 800 . 100n
b) What is the power lost during conduction (Pcond)?
i) loop
ii) 2 . 10H
iii) 100u
iv)
10u
10u
100u
2 . 10u
2 - 100p
c) What is the average power dissipated?
250u
11)
250u - 100u
iii )
250u
iv )
250u
(40u - 10H) . 2
2 . 40H
40u - 10u
40u
A

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