| 摘要 |
A motor drive circuit comprising, an amplifier which receives output signals of a Hall element for determining the phase of the rotor in a single phase DC motor and outputs the same after amplification; a drive signal generating circuit which receives the amplified signals of the amplifier, generates first and second pulses each having a duty of about 50% of which phases differ by about 180 degrees and outputs the same; a first drive circuit connected to a first terminal of the single phase DC motor and a second drive circuit connected to a second terminal of the single phase DC motor. The first and second drive circuits each including, a first transistor circuit which supplies a current to the single phase DC motor, a second transistor circuit which sinks a current from the single phase DC motor; and a diode which bypasses a current flown out from the single phase DC motor toward a power source line side.
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