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Title:
モデル追従型整流回路とその制御方法
Document Type and Number:
Japanese Patent JP3600893
Kind Code:
B2
Abstract:
A circuit and method for controlling commutation of an electric motor includes first and second n-bit counters. The counters alternately serve as model reference and model following counters during alternate zero-cross intervals of a detected back-emf signal which is generated during rotation of the electric motor. The model following counter counts clock cycles occurring since a detected zero cross and continues counting until an optimal commutation switching point is detected, which is ideally located halfway through a commutation interval. A masking circuit is provided to mask spurious zero cross detections during a desired masking interval. A soft switching circuit determines commutation starting and ending points which are symmetrically located with respect to a center point of a commutation interval. Overflow protection circuits protect the counters from overflow during long commutation intervals and the like, and the internal clock is modulated to prevent overflow during certain operating conditions.

Inventors:
Akira Yushi
Lee Sun Yong
Lee
Application Number:
JP11089896A
Publication Date:
December 15, 2004
Filing Date:
May 01, 1996
Export Citation:
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Assignee:
Samsung Electronics Co.,Ltd.
International Classes:
G11B19/20; H02P6/06; H02P6/08; H02P6/10; H02P6/182; (IPC1-7): H02P6/08; G11B19/00
Domestic Patent References:
JP1122388A
JP6237594A
Attorney, Agent or Firm:
Makoto Hagiwara