Applications of Silicon Controlled Rectifiers (Thyristors)

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Applications of Silicon Controlled
Rectifiers(Thyristors)
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Topology of an SCR

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Practical Uses

• Controlled Fulled-Wave Rectifier

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Example Alarm Triggered by a SCR

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• Infrared Detector Pair

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Biasing The Emitter Detector Pair
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Current Source to Assure Triggering the Circuit
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Triggering The Thyristor
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Major considerations when ordering a SCR are

• (a) Peak forward and reverse breakdown
  voltages(b) Maximum forward current(c) Gate
  trigger voltage and current(d) Minimum holding
  current,Ih(e) Power dissipation

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Understanding Data Sheets
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• Advantages
• Drive Very High Currents by applying only a small
  current in the circuit.
• Example
• Remote Control
• Fastter Response Than Any Other Semiconductor

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Questions?