Frequency control circuit, motor drive apparatus, frequency...

Electricity: motive power systems – Reciprocating or oscillating motor

Reexamination Certificate

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Details

C318S120000, C310S323020

Reexamination Certificate

active

07317291

ABSTRACT:
A frequency control circuit including a control circuit for setting a set value, an adding circuit for adding the set value per unit time and effecting counting based on the adding result, and a signal output circuit for outputting an alternating signal of a cycle corresponding to the time necessary for the count result by the adding circuit to reach a target value. The control circuit sets the set value as a value which does not correspond to a submultiple of the target value, and the adding circuit starts the counting of a next cycle when the count result reaches the target value. The control circuit further sets an initial value of the counting of the next cycle in accordance with a value of a portion of the adding results, exceeding the target value when the count result reaches the target value.

REFERENCES:
patent: 5656881 (1997-08-01), Atsuta
patent: 5696421 (1997-12-01), Zumeris et al.
patent: 5698930 (1997-12-01), Takagi
patent: 6747394 (2004-06-01), Johansson et al.
patent: 7109639 (2006-09-01), Yamamoto
patent: 03-289375 (1991-12-01), None
patent: 2004-320846 (2004-11-01), None

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