SCR Equivalence to Transistors
A Silicon Controlled Rectifier (SCR) is a semiconductor device primarily used for controlling high power loads.
Its internal structure can be understood as comprising two complementary transistors: one NPN and one PNP.
These transistors are interconnected in a specific feedback configuration:
- The collector terminal of the NPN transistor is linked to the base terminal of the PNP transistor.
- The collector terminal of the PNP transistor is linked to the base terminal of the NPN transistor.
- The emitter of the NPN transistor corresponds to the SCR's Anode.
- The emitter of the PNP transistor corresponds to the SCR's Cathode.
This arrangement, where the bases are effectively cross-connected via the collectors, forms the fundamental operational principle of the SCR. This structure is conceptually similar to the description of NPN and PNP transistors connected base-to-base.
Among the given options, the SCR is the device that accurately represents this NPN and PNP transistor combination.
Important Questions from Power Semiconductor Diodes and Transistors
- The maximum peak emitter current of UJT at 25°C is:
Diacs are primarily used as:
A modern power semiconductor device that combines the characteristics of BJT and MOSFET is:
Which of the following circuit is used to obtain pulse gate triggering?
A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose?
