Low loss, resettable excitation control for an inductive load

Details Low loss, resettable excitation control for an inductive load Low loss, resettable excitation control for an inductive load

1977-12-12

1979-08-21

Smith, Jr., David

Electricity: motive power systems

Control of both armature circuit

318338, 318375, 318381, 318536, H02P 506

Patent

active

041654765

ABSTRACT:
In a power control system in which a time ratio control power circuit regulates the average current in an inductive load by repetitively connecting and disconnecting the load and a d-c power source, a variable impedance is connected in parallel circuit relationship with the load and is controlled so as to vary the inductive-resistive time constant of the load circuit. When necessary to rapidly reduce the current in the load, the impedance is made relatively large so that current rapidly decays. Conversely, the impedance is maintained at a minimum value when the load current is less than or substantially equal to a desired value.

REFERENCES:
patent: 3221234 (1966-11-01), Ault
patent: 3486102 (1969-12-01), Wilkerson
patent: 3544873 (1970-12-01), Gunsser et al.
patent: 3803468 (1974-04-01), Soeda
patent: 4017777 (1977-04-01), Bailey
patent: 4096423 (1978-06-01), Bailey et al.

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