Question

Q4. a) A phase controlled AC to DC converter driving a constant current load is shown. Sketch the voltage waveform across the constant current load and derive the average output voltage across the load at a firing angle $\alpha$. + $T_1$$T_3$ $T_4$$T_2$ $v_d$ $I_d$ (6 marks) b) Now the converter in part a is modified by replacing thyristors $T_2$ and $T_4$ with diodes. Sketch the voltage waveform across the constant current load and derive the average output voltage across the load at a firing angle $\alpha$. (7 marks) c) The converter in part a is further modified by replacing thyristors $T_1$ and $T_2$ with diodes. Sketch the voltage waveform across the constant current load and derive the average output voltage across the load at a firing angle $\alpha$. (7 marks)

          Q4.
a) A phase controlled AC to DC converter driving a constant current load is
shown. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle $\alpha$.
+ 
$T_1$$T_3$
$T_4$$T_2$
$v_d$
$I_d$
(6 marks)
b) Now the converter in part a is modified by replacing thyristors $T_2$ and $T_4$ with
diodes. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle $\alpha$.
(7 marks)
c) The converter in part a is further modified by replacing thyristors $T_1$ and $T_2$
with diodes. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle $\alpha$.
(7 marks)

Q4.
a) A phase controlled AC to DC converter driving a constant current load is
shown. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle α.
+
T1T3
T4T2
vd
Id
(6 marks)
b) Now the converter in part a is modified by replacing thyristors T2 and T4 with
diodes. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle α.
(7 marks)
c) The converter in part a is further modified by replacing thyristors T1 and T2
with diodes. Sketch the voltage waveform across the constant current load and
derive the average output voltage across the load at a firing angle α.
(7 marks)

Added by Jennifer R.

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