Thyristor & Power Control Circuits Unit 3 – SCR DC Control
Exercise 1 – SCR Half-Wave Rectifier
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to demonstrate how an SCR operates as
a controlled half-wave rectifier. You will verify your results with an oscilloscope.
EXERCISE DISCUSSION
- The SCR is used as a controlled half-wave rectifier.
- With S1 open, the SCR is off and no current flows through the load resistor R4.
- When S1 is closed, the SCR is triggered on and the current flows during the positive half-
cycle of Vac.