Reverse phase angle control of A.C. power loads

Details Reverse phase angle control of A.C. power loads Reverse phase angle control of A.C. power loads

1990-08-06

1991-12-10

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Zero switching

323237, 323320, 315206, H02M 5458, G05F 502

Patent

active

050721704

ABSTRACT:
AC power loads such as from transformers, motors, high in-rush heaters, air conditioners, etc., are controlled by the use of bipolar transistors, FET transistors, gate turn-off SCRs and IGBT to turn on the load at zero-cross over and to turn off the load at any point in the sine wave which produces the desired amount of power. This reduces RFI and virtually eliminates di/dt at turn on since both voltage and current start at the same zero cross-over, and hence will improve the power factor. Both analogue and digital logic systems can also be utilized to produce this type of phase control, and a wide variety of possibilities are available such as serial and parallel input, the use of full wave bridge control, etc.

REFERENCES:
patent: 4688161 (1987-08-01), Covington
patent: 4864487 (1989-09-01), Schnetzka, II et al.
patent: 4870340 (1989-09-01), Kral

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