Thyristors

Question 1

How many layers does a thyristor have?

Answer 1

4 (PNPN)

Question 2

What are the terminals of a Thyristor?

Answer 2

Anode, Cathode, Gate

Question 3

It is used to control electric power and current by acting as a switch

Answer 3

Thyristor

Question 4

How many junctions does a thyristor have?

Answer 4

3 Junctions

Question 5

The state of a thyristor when the NP junction blocks the flow of a positive current from the anode to the cathode.

Answer 5

Forward Blocking State

Question 6

The state of a thyristor when the outer PN junctions blocks the flow of a negative current

Answer 6

Reverse Blocking State

Question 7

The state of a thyristor when it receives a sufficient signal to switch on and start conducting

Answer 7

Forward Conducting State

Question 8

It is the minimum current required to keep the thyristor conducting

Answer 8

Holding Current

Question 9

How to unlatch a thyristor?

Answer 9

reduce the anode-cathode current below the holding current

Question 10

The current through the thyristor that is high enough to meet the unity gain criteria

Answer 10

Latching Current

Question 11

How can a thyristor turn on when gate current is 0?

Answer 11

Applied current must reach breakover voltage (Avalanche Breakdown)

Question 12

Are the most widely known thyristors

Answer 12

Silicon Controlled Rectifier (SCR)

Question 13

In what type of circuits are SCRs commonly used?

Answer 13

Switching

Question 14

Are thyristors that allows electric conduction in the reverse direction

Answer 14

Reverse Conducting Thyristor (RCT)

Question 15

Devices that increase the electron-hole pairs in the thyristor when light particles strike the reverse biased junction

Answer 15

Light-Activated Silicon-Controlled Rectifier (LASCR)

Question 16

A thyristor that can be switched off by applying a negative current to the gate

Answer 16

Gate Turn-Off Thyristor (GTO)

Question 17

Is a combination of a GTO and MOSFET

Answer 17

MOS Turn-Off Thyristor (MTO)

Question 18

Are thyristors used for AC Voltage Control

Answer 18

Bidirectional Thyristors

Question 19

The second most widely used thyristors after SCR

Answer 19

Triode for Alternating Current (TRIAC)

Question 20

They can provide control on both halves of the alternating waveform

Answer 20

Triode for Alternating Current (TRIAC)

Question 21

Are used in conjunction with TRIACS

Answer 21

Diode for Alternating Current (DIAC)

Question 22

Are similar to DIACs but have a higher breakover voltage and greater power handling capability

Answer 22

Silicon Diode for Alternating Current (SIDAC)

Question 23

How many layers does SIDAC have?

Answer 23

5 Layers