Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1981-01-26
1982-06-29
Beha, Jr., William H.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
307252T, 323325, 323902, G05F 500
Patent
active
043374301
ABSTRACT:
A circuit for controlling power delivery to different AC inductive loads, which loads create different respective lag angles between applied voltage and delivered current up to a known maximum lag angle. Included is a switching circuit, typically including silicon-controlled rectifiers, connected to the load. The switching circuit is trigger-pulse-switched into conduction, and thereafter maintained in conduction so long as current through the load exceeds a certain minimum value. Additionally, a trigger-pulse generator connected to the switching circuit operates in two modes. In one mode, the conduction angle is less than a predetermined maximum width which is no less than the maximum lag angle. In this mode, a pulse is generated whose width is essentially equal to the conduction angle. In the other mode, the conduction angle is no less than the maximum width, and the generated pulse has a fixed width substantially equaling the maximum width.
REFERENCES:
patent: 3936726 (1976-02-01), Kelley
patent: 4122384 (1978-10-01), Suzuki
patent: 4260948 (1981-04-01), Okado
Beha Jr. William H.
Electronics Diversified, Inc.
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