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4002test2(b)

# 4002test2(b) - ~-sJ.~ 76.9 EE 4002 04.12.2002 Name MID...

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-., ~ r , ", -sJ.~ 76.9 EE 4002 04.12.2002 Name: .. MID SEMESTER TEST NO.2 Answer 3 of 4 questions and solve the numerical problem Question 1 (2 points): For a switch-mode two-quadrant converter: a) Draw the circuit diagram of two-quadrant converter (with transistors and diodes- not necessary with control circuit) connected to the DC motor (armature inductance, resistance and EMF). b) Which transistors and diodes (use symbols e.g. T2, Dl) are conducting when the DC machine'operates as a motor, and which, when it operates as a generator. What is the relation (use sign> or <) between the average output converter voltage and motor EMF at each mode of operation. c) Draw the waveforms of input and output voltages and currents. Write the relations between average input and output voltages and currents. (n\ '. (AJ ,,~ BlAck / \ '&osl- I ( II " a:\ ~ "D . ' I I \ I : \,1 '. i i , . i; T; . \ ! 2- \ \ @ ,..-- vo\~==::~~--_J=-=--'" 6?6S+- VVt+N L E~ - Ii ~ \)2- Bt.\ck J fowe r-- Plotrl) S ~'- L I T; ~ D, ~ -+~ "';).;IV\yt..e '" _rJ~~-- J f2 J I .

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~ 4 '1'" ' Question 2 (2 points): ' ':'/' a) Draw the simplified control circuit diagram (with two blocks: controller - Gees),
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4002test2(b) - ~-sJ.~ 76.9 EE 4002 04.12.2002 Name MID...

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