D6 SCR Flashcards
Anode is what polarity
Positive
Anode forward current
max continuous current that can flow from cathode to anode
What does IH mean
the holding current or min current required to sustain conduction
what is the operating temp for a SCR
-40 C to 125 C
advantages of a SCR over a switch
it is a solid state device therfore, not subject to corrosion, pitting, arcing or contact bounce
what terminal of a SCR is tied to the heat sink
Anode
what is BVF (forward breakover voltage) for a SCR
when the anode to cathode voltage is increased to a sufficient magnitude the SCR will turn on.
for a SCR what happens when the polarity is reversed and voltage increased?
if the voltage is increased beyond the Reverse avalanche breakdown voltage it will destroy the SCR
Define: firing or triggering a SCR
turning on the SCR so it will conduct
Define: Communtating
turning off the SCR
Why must a resistor be in series with a SCR?
When a SCR is turned on it acts like a closed switch or a short
Name on common application of phase control using the SCR
Varying the speed of a DC Motor
Define: resistor triggering a SCR
the ability to trigger a SCR between 0 and 90 degrees
Define: resistor-capacitor triggering
the ability to trigger a SCR between 0 and 180 degrees
what happen to a SCR on the negative half-cycle?
it remains off and does not conduct (acts like a diode when reversed biased)
