Thyristor Semiconductor Products Page 83 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1009 Characteristics Formulas for Phase Control Circuits Circuit Name Max Thyristor Voltage PRV Max. Load Voltage E d =Avg. E a =RMS Load Load Voltage with Delayed Firing Max. Average Thyristor or Rectifier Current SCR Avg. Amps Conduction Period Half-wave Resistive Load 1.4 E RMS E P E d p = E a p = 2 E 2 d p ( cos ) 1 + = E 2 ( - + 1 2 sin2 ) p E = a E R p 180 Full-wave Bridge 1.4 E RMS E P E 2E d p = E = E 2 d p ) ( cos 1 + E R p 180 Full-wave AC Switch Resistive Load 1.4 E RMS E P E a p = 1.4 E 2 ( - + 1 2 sin2 ) p E = a E R p 180 NOTE: Angle alpha ( ) is in radians. E RMS Load R Half-wave Resistive Load - Schematic E Load R L Full-wave Bridge - Schematic E RMS Load R Full-wave AC Switch Resistive Load - Schematic 0 E P Half-wave Resistive Load - Waveform 0 E P Full-wave Bridge - Waveform 0 E P Full-wave AC Switch Resistive Load - Waveform Miscellaneous Design Tips and Facts (continued)

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