Patent ID: 7002307

Claim:
A single phase motor driving unit comprising: a first driving transistor supplying a single phase coil with a driving electric current in a certain direction; a second driving transistor supplying said single phase coil with a driving electric current in the opposite direction with respect to the certain direction; a recirculating section which recirculates the driving electric current for said single phase coil by controlling on-off timings of said first driving transistor and said second driving transistor in a predetermined period immediately before the direction of the driving electric current for said single phase coil changes; and a comparison section which compares a value of a sine wave signal obtained from a Hall device detecting a rotational position of a single phase motor and a reference value and outputs a timing signal corresponding to said predetermined period, wherein said recirculating section controls on-off timings of said first driving transistor and said second driving transistor based on said timing signal.