Patent ID: 6020700
Filing Date: 2000-02-01
Classification: H02P

Abstract:
A motor drive circuit for a DC brushless motor, comprising:an amplifying and comparing circuit having two inputs for receiving an output signal from a Hall element via a first and a second signal input terminals and an output for generating an amplified output signal;a multiplexer having two inputs and an output wherein said two inputs are respectively connected to said first signal input terminal and the output of said amplifying and comparing circuit for selecting a connection from one of said two inputs to said output;an input control circuit coupled between said multiplexer and said second signal input terminal to detect whether said Hall element is a Hall sensor or a Hall IC for controlling said multiplexer; anda drive pulse generator having an input connected to the output of said multiplexer and four outputs connected to four transistors respectively for generating clock signals to drive said four transistors for providing driving signals to said motor via two output terminals.