Patent Number: 6,297,603

Title: Circuit and method to avoid high current spikes in stator windings

Abstract: A circuit for minimizing the current spikes in through the stator coils in a brushless dc motor is disclosed. The circuit includes a voltage amplifier for receiving an input signal voltage and a feedback voltage, a compensation circuit for compensating the output of the voltage amplifier, a second voltage amplifier for amplifying the compensated output, a switch for selectively connecting compensated output to the stator coils, and a conductive path for discharging the compensation circuit when the switch is not conducting. The conductive path can be a transistor or a transistor in series with a voltage reference device. The invention reduces the commutation noise and the dynamic power requirement in a brushless direct current motor.

Inventors: Carobolante; Francesco (Portola Valley, CA)

Assignee: STMicroelectronics, Inc.

International Classification: H02P 6/00 (20060101); H02P 6/14 (20060101); H02K 023/00 ()

Expiration Date: 10/02/2018