Circuit for rectifying power of single pole/double-pole power supply

PURPOSE: To obtain a DC commutator that is independent of a sampling device. CONSTITUTION: The drive voltage of a brushless DC motor without sensor is rectified in the device as specified in the following. The position and the speed of a rotor are determined by detecting the inversion of the polarity of the back electromotive force of a leg that is not driven, when a comparison is made with a converted reference. In the special measurement of efficiency, a device includes a rectification delay timing circuit for optimizing a motor operation and minimizes the participation of a microprocessor or other microcontrollers. COPYRIGHT: (C)1992,JPO