Phase-fired controller

Unrectified AC voltage regulated by phase control

Phase-fired control (PFC), also called phase cutting or phase-angle control, is a method for power limiting, applied to AC voltages.^[1] It works by modulating a thyristor, SCR, triac, thyratron, or other such gated diode-like devices into and out of conduction at a predetermined phase angle of the applied waveform.^[2]

^ Software and hardware applications of microcomputers. M. H. Hamza, G. K. F. Lee, IEEE Control Systems Society, International Society for Mini-Microcomputers. Anaheim, Calif.: ACTA Press. 1986. p. 2. ISBN 0-88986-085-8. OCLC 24541232.{{cite book}}: CS1 maint: others (link)
^ D.W., McDonald (1980). "ac power control in the Core Flow Test Loop". {{cite journal}}: Cite journal requires |journal= (help)

[1] Software and hardware applications of microcomputers. M. H. Hamza, G. K. F. Lee, IEEE Control Systems Society, International Society for Mini-Microcomputers. Anaheim, Calif.: ACTA Press. 1986. p. 2. ISBN 0-88986-085-8. OCLC 24541232.{{cite book}}: CS1 maint: others (link)

[2] D.W., McDonald (1980). "ac power control in the Core Flow Test Loop". {{cite journal}}: Cite journal requires |journal= (help)

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