Patent ID: 8125179

Claim:
A motor control circuit (MC) comprising: input terminals (IT 1 , IT 2 ) for receiving a rectified input voltage (Vrm), output terminals (OT 1 , OT 2 ) for supplying a motor drive signal (Vm), a switching circuit ( 1 ) being alternately in an on-state (Ton) and an off-state (Toff) for intermittently coupling the input terminals (IT 1 , IT 2 ) to the output terminals (OT 1 , OT 2 ), a controller ( 2 ) for controlling the switching circuit ( 1 ) to be (i) in the on-state (Ton) during a first period in time (T 1 ) when an amount of magnetic saturation of the motor is smaller than a predetermined value, and (ii) alternately in the on-state (Ton) and the off-state (Toff) to obtain a pulse width control of the motor drive signal (Vm) during a second period in time (T 2 ) when the amount of magnetic saturation of the motor is larger than the predetermined value.