Brushless motor drive circuit

摘要

A brushless motor drive circuit which can suppress switching pulses without using capacitors or other external components is provided. The brushless motor drive circuit has a hall element for generating two sinusoidal signals of opposite phase and a switching circuit which separates the two sinusoidal signals and cuts off the negative portion to produce two half cycle signals. The two half cycle signals are combined in the switching circuit, and the combined signal is applied to an automatic gain control circuit for providing a stable current to the hall element.