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7 Cards in this Set

  • Front
  • Back

SCR

Three terminal device used to control large amount of current to the load

2 States of SCR

On


Off

Unique Characteristics of SCR

-Regenerative Effect


-Latch-on


-Outside circuitry to turn-off the SCR

Firing Delay

Number of degrees of an ac cycle before the SCR is turned on

Conduction Angle

Number of degrees of an ac cycle when SCR is on

Advantage of SCR

-Small and relatively in expense


-Needs no Maintenance


- Needs very little power

Disadvantage of SCR

-Temperature dependent


-inconsistent firing behavior