Quiz

1
Quiz

• The periodic waveform below represents the filter
  inductor current in a push-pull converter, whose
  output voltage is regulated to 12 volts.
• What is the value of the inductor in
  microhenries?
• What is the operating frequency of the converter?
• Sketch the voltage waveform at the input of the
  filter inductor.

IL
46.0 A
42.5 A
39.0 A
10.0 mS
12.5 mS
2
Thyristor (SCR) Converters
Direct power control in Utility Applications at
High Power Levels
P
N
P
N
Silicon Controlled Rectifier SCR
3
Half Wave Rectification
vload
Trigger pulses delayed from zero crossing by
Commutation Angle a
4
Full Wave Rectified Voltage
Resulting current to resistive Load
Thyristor turns off when current goes to zero
5
Resistive Load With Inductance
iload
vload
6
AC Power Control (Triac)
vload
7
AC Power Control
a