Q.2 A bipolar transistor shown in the figure below is used as a Chopper Switch with a frequency of fs = 30 kHz. The DC input voltage of the chopper is Vs = X Volts and load current IL = Y Amperes. Where X = last three digits of your Roll Number and Y = first three digits of your Roll Number. The switching times are tr= 1µs and tr= 5µs. Determine the values of a) Ls b) Cs c) Rs for critically damped condition

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Advance power electronics
Q.2 A bipolar transistor shown in the figure below is used as a Chopper Switch with a frequency
of fs = 30 kHz. The DC input voltage of the chopper is Vs=X Volts and load current IL = Y
Amperes. Where X = last three digits of your Roll Number and Y = first three digits of your
Roll Number. The switching times are tr= 1µs and tr= 5µs.
Determine the values of
a) Ls
b) Cs
c) Rs for critically damped condition
d) Rs if the discharge time is limited to one-third of switching period
e) Rs if the peak discharge current is limited to 10% of load current
Assume that VCE(sat) = 0
L,
i
R
is
L
Vs
Rs
Q1
VG
RG
R,
D,
Transcribed Image Text:Q.2 A bipolar transistor shown in the figure below is used as a Chopper Switch with a frequency of fs = 30 kHz. The DC input voltage of the chopper is Vs=X Volts and load current IL = Y Amperes. Where X = last three digits of your Roll Number and Y = first three digits of your Roll Number. The switching times are tr= 1µs and tr= 5µs. Determine the values of a) Ls b) Cs c) Rs for critically damped condition d) Rs if the discharge time is limited to one-third of switching period e) Rs if the peak discharge current is limited to 10% of load current Assume that VCE(sat) = 0 L, i R is L Vs Rs Q1 VG RG R, D,
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