USES AND MISUSES OF SCR'S

Silicon controlled rectifiers are basically on-off switches, similar to a diode, but modified to block voltage in the forward direction until it has been gated-on. Their switching action controls power to a load by frequency, current and voltage modulation, as in dc to ac and ac to dc converters. All SCR's are not the same, however, and it is important to determine which operating parameters and characteristics are essential early in the design stage. Too often the SCR is chosen after driver circuits, loads, and other circuit requirements are finalized. When SCR's fail in an inverter circuit, for example, the cause could be overvoltage or overcurrent, or the turn-off time might be too long. Or perhaps the voltage wavefront is too sharp, or the wrong gate drive was used. In any event, the reasons for the failures may not be found in the specification sheets. It may be necessary to consult the manufacturer directly to find a solution.

  • Corporate Authors:

    United Technical Publications

    645 Stewart Avenue
    Garden City, NY  USA  11530
  • Authors:
    • Hunt, S R
    • Balenovich, J D
    • Sherbondy, G M
  • Publication Date: 1974-9-16

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00072786
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jan 16 1976 12:00AM