Thyristor & Power Control Circuits Unit 2 – Silicon Controlled Rectifier
Exercise 2 – SCR DC Operation
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to to turn an SCR on and off by using
a switch and a two-post connector. You will verify your results with an oscilloscope and a
multimeter.
EXERCISE DISCUSSION
- An SCR can be thought of as a triggered diode. The SCR can be forward biased but not
conducting until it is triggered by a gate current. - The anode-to-cathode voltage drops, once the SCR is turned on.
- Once the SCR is on, it conducts until the anode current is removed or falls below a minimum
value, known as the holding current (IH).