Silicon-controlled rectifi ers (SCR)

Silicon-controlled rectifi ers (SCR)

1. can be triggered into conduction by applying a small curren

2. SCRs are able to control large voltages

3. which form NPNP or PNPN structures

4. The anode terminal of an SCR is connected to the p-type material of a PNPN structure

5. There are three modes of operation for an SCR depending upon the biasing given to it

   • Forward blocking mode (off state)
   • Forward conduction mode (on state)
   • Reverse blocking mode (off state

6. SCRs and similar devices are used for rectification

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