Which one of the following is/are not true with reference to a thyrist...
Silicon Controlled Rectifier is a device that has four layers and three PN junctions. The silicon control rectifier (SCR) consists of four layers of semiconductors, which form NPNP or PNPN structures, having three P-N junctions labeled J1, J2 and J3, and three terminals.
- The anode terminal of an SCR is connected to the p-type material of a PNPN structure, and the cathode terminal is connected to the n-type layer, while the gate of the SCR is connected to the p-type material nearest to the cathode.
- A thyristor or SCR (silicon-controlled rectifier) can only conduct in one direction so it is mostly called a DC switch.
Latching & Holding Current:
- Latching Current is the minimum anode current required to maintain the thyristor in the ON state immediately after a thyristor has been turned on and the the gate signal has been removed.
- Holding Current is the minimum anode current to maintain the thyristor in the on-state.
- Latching current is always greater than holding current.
- Latching current is the minimum value of anode current which it must attain during turn – ON process to maintain conduction when gate signal is removed.
- Holding current is the minimum value of anode current below which it must fall for turning – OFF the thyristor.
Which one of the following is/are not true with reference to a thyrist...
And 2
b)Only 1
c)Only 2
d)None of the above