Phase control switching circuit without zero crossing detection

Details Phase control switching circuit without zero crossing detection Phase control switching circuit without zero crossing detection

1989-10-16

1991-04-02

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Zero switching

323244, 323319, 323320, 307584, G05F 1445

Patent

active

050049690

ABSTRACT:
A method and circuit for reverse phase control of alternating current being delivered to a load are disclosed wherein voltage-controlled semiconductor switches, such as MOSFET's and IGBT's, are used as electronic switches to conduct voltage during the leading edge of the AC voltage cycle and conduction is terminated when the desired phase angle of the current flow has been reached. The disclosed method and circuit eliminate the need for zero crossing detection of the AC waveform and ensure that the voltage-controlled switches are always turned on before the zero crossing thereby minimizing radiated interference and incandescent lamp hum. The method used is primarily digital in nature making mechanical input or electronic input for the power control equally efficient to implement.

REFERENCES:
patent: 4086526 (1978-04-01), Grudelbach
patent: 4479175 (1984-10-01), Gille et al.
patent: 4528494 (1985-07-01), Bloomer
patent: 4567425 (1986-01-01), Bloomer
patent: 4617508 (1986-10-01), Bloomer
patent: 4649302 (1987-03-01), Damiano et al.
patent: 4680490 (1987-07-01), Baker et al.
patent: 4823069 (1989-04-01), Callahan et al.
patent: 4904906 (1990-02-01), Atherton et al.

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