公开(公告)号：US20040000885A1

公开(公告)日：2004-01-01

申请号：US10608273

申请日：2003-06-27

Applicant: STMicroelectronics, Inc.

Inventor： Jianwen Shao

IPC: H02P001/18

CPC classification number: H02P6/085 ,  H02P6/15 ,  H02P6/182

Abstract: A circuit and method provide a back EMF signal that represents a back EMF voltage induced in a coil of a brushless motor. In one embodiment of the invention, the circuit includes an input node operable to receive a tap voltage from the coil, and a network coupled to the input node and operable to generate the back EMF signal by removing a predetermined offset voltage from the tap voltage. Such a circuit provides a signal that more accurately indicates a zero crossing than existing circuits for controlling a sensorless brushless motor.

Abstract translation: 电路和方法提供表示在无刷电动机的线圈中感应的反电动势电压的反电动势信号。 在本发明的一个实施例中，电路包括可操作以从线圈接收抽头电压的输入节点和耦合到输入节点的网络，并且可操作以通过从分接电压去除预定偏移电压来产生反电动势信号。 这种电路提供了一种信号，该信号比用于控制无传感器的无刷电动机的现有电路更准确地指示过零点。