Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2006-06-19
2010-12-21
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400240, C318S400340
Reexamination Certificate
active
07855523
ABSTRACT:
A back electromotive detection comparator compares back electromotive voltages Vu to Vw with a common voltage Vn of coils, and generates first rectangular wave signals Pu to Pw. A masking circuit performs masking of the first rectangular wave signals Pu to Pw, and outputs the resultant signals as second rectangular wave signals Mu to Mw. An output circuit supplies a drive current to coils on the basis of the second rectangular wave signals Mu to Mw. A frequency generating circuit generates a frequency generation signal SigFG whose level switches at every edge of the second rectangular wave signals Mu to Mw. A mask signal generating circuit generates a mask signal MSK which is at a high level during an interval multiplied by a coefficient to a pulse width Tp of the frequency generation signal SigFG after level transition of the frequency generation signal SigFG. The masking circuit nullifies level fluctuation of the first rectangular wave signals Pu to Pw during an interval when a mask signal MSK is at the high level.
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International Search Report for International Application No. PCT/JP2006/312243 mailed Aug. 29, 2006.
Written Opinion of the International Searching Authority for PCT/JP2006-312243 mailed Aug. 29, 2006.
Cantor & Colburn LLP
Ro Bentsu
Rohm & Co., Ltd.
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