Rotor position detection circuit and motor driving device

Details Rotor position detection circuit and motor driving device Rotor position detection circuit and motor driving device

2007-06-19

2010-06-08

Benson, Walter (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S254100, C318S400340, C318S400360, C318S718000

Reexamination Certificate

active

07733042

ABSTRACT:
A rotor position detection circuit detects a position of a rotor in a motor from a detection signal of an induced voltage generated in a stator coil. The circuit includes: a first low pass filter having a first reference potential for filtering the detection signal; a comparator for comparing an output signal from the first low pass filter with a predetermined reference voltage and for outputting a rotation position signal; and a second low pass filter having a second reference potential for filtering a virtual neutral point potential of the motor. The first reference potential is the filtered virtual neutral point potential, and the second reference potential is a ground.

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Office Action dated Dec. 19, 2008 in corresponding DE application No. 10 2007 030 748.0-32 (and English Translation).
Office Action dated Sep. 4, 2009 in corresponding Chinese Patent Application No. 2007101271994 (and English translation).
Second Office Action issued from the Chinese Patent Office on Mar. 3, 2010 in the corresponding Chinese patent application No. 2007101271994 (a copy and English translation thereof).

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