Patent ID: 6130989
Filing Date: 2000-10-10
Classification: H02P

Abstract:
A motor drive circuit, wherein a motor drive current is supplied to a first coil and to a second coil of a motor, said motor drive current being generated based on a sine wave signal according to relative position relationships between a stator and a rotor of said motor, comprising:a first drive transistor for supplying a first motor drive current to said first coil based on said sine wave signal and a second drive transistor for supplying a second motor drive current to said second coil based on said sine wave signal, said first drive current and said second drive current being complementarily to each other; anda drive transistor control circuit for comparing a amplification absolute value signal with an absolute value signal of said sine wave signal, said amplification absolute value signal being obtained by amplifying said absolute value signal with a predetermined amplification factor, and turning on said first drive transistor and said second drive transistor only when the difference between said amplification absolute value signal and said absolute value signal exceeds a predetermined amount.