Patent ID: 7072199
Filing Date: 2006-07-04
Classification: H02M,Y02B

Abstract:
1. A motor control circuit for supplying a driving voltage to a motor, the motor having a first terminal and a second terminal, the driving voltage being applied between the first and the second terminals, the motor control circuit comprising: an H-bridge circuit having a first linear unit, a second linear unit, a first switching unit, and a second switching unit, the first linear unit and the first switching unit being together coupled to the first terminal and the second linear unit and the second switching unit being together coupled to the second terminal; a voltage detection circuit for generating at least one voltage detection signal representative of the driving voltage of the motor; an error amplifier for generating at least one error signal representative of a difference between the at least one voltage detection signal and a command voltage signal, the at least one error signal being electrically separate from the first and the second switching units; a feedback circuit coupled to the error amplifier for receiving the at least one error signal so as to apply the at least one error signal selectively to the first or the second linear unit; and a state control circuit for synchronously controlling the first and the second switching units and the feedback circuit such that during a first operational period the first switching unit is operated in a nonconductive mode, the second switching unit is operated in a conductive mode, the feedback circuit allows one of the at least one error signal to be applied to the first linear unit for operating the first linear unit in a linear mode, and the feedback circuit prevents the at least one error signal from being applied to the second linear unit, thereby controlling the driving voltage to become substantially proportional to the command voltage signal.