Pulse width modulated control method and means

Details Pulse width modulated control method and means Pulse width modulated control method and means

1987-08-24

1989-06-20

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

318139, 318599, 388903, H02P 516

Patent

active

048412074

ABSTRACT:
The method uses at least one power switch having "on" and "off" states for providing, respectively, low and high impedance paths between an inductive load and a source of power and thereby controls current flow through the inductive load during a sequence of regular reoccurring time periods. The at least one power switch is switched, if in the "off" state, to the "on" state substantially at the beginning of at least some of the time periods. The method is operative during any one of a plurality of the "on" duty periods and switches the at least one power switch from the "on" state to the "off" state when a predetermined level of current flow has been reached in one of the inductive load and the at least on power switch, and switches the at least one power switch back to the "on" state independent of the occurrence of the beginning of a time period.

REFERENCES:
patent: 3914671 (1975-10-01), Morton et al.
patent: 4037145 (1977-07-01), Bailey et al.
patent: 4169990 (1979-10-01), Lerdman
patent: 4215383 (1980-07-01), Boyd et al.
patent: 4291259 (1981-09-01), Marumoto et al.
patent: 4328447 (1982-05-01), Davis et al.
patent: 4355342 (1982-10-01), Franzolini
patent: 4390826 (1983-06-01), Erdman et al.
patent: 4401926 (1983-08-01), Morton et al.
patent: 4468597 (1984-08-01), Baumard et al.
Brochure entitled Switched Mode Power Supply Controller No. NE/SE 5561 by Signetics dated May, 1981 (cover page and pp. 1-6).

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