Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2009-06-11
2011-10-04
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400010, C318S400060, C318S601000, C318S607000, C318S608000, C318S700000
Reexamination Certificate
active
08030864
ABSTRACT:
A motor drive circuit includes a first amplifier circuit to amplify a difference between first and second position detection signals with a gain becoming smaller according to drop in power supply voltage, to output a first amplification signal, the first and second position detection signals being signals indicating a rotational position of a rotor in a motor, having a frequency corresponding to a rotation speed of the motor, and being opposite in phase to each other; a second amplifier circuit to amplify the difference between the first and second position detection signals with the gain, to output a second amplification signal opposite in phase to the first amplification signal; and a drive circuit to amplify the difference between the first amplification signal and the second amplification signal with a predetermined gain to be saturated at the power supply voltage, to output a driving voltage for driving the motor.
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Iida Takahiro
Imai Toshiyuki
Noie Joji
Benson Walter
Chan Kawing
Gunther John E.
Sanyo Semiconductor Co. Ltd.
Semiconductor Components Industries LLC
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