公开(公告)号：US20140145661A1

公开(公告)日：2014-05-29

申请号：US13687193

申请日：2012-11-28

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE. LT

Inventor： Wei Seng Chew ,  Kaufik Linggajaya

IPC: H02P6/18

CPC classification number: H02P6/182

Abstract: A first input of a differential circuit is coupled to a coil tap for a first phase of a multi-phase brushless DC motor. The first phase is associated with an electrically floating coil. A second input of the differential circuit is coupled to a virtual center tap. A divider circuit is coupled between coil taps for other phases of the multi-phase brushless DC motor to define a virtual center tap. The other phases are phases actuated for motor operation when the first phase is electrically floating. The coil tap for the first phase is electrically isolated from the virtual center tap. The differential circuit performs a comparison of the voltage at the coil tap for the first phase to the voltage at the virtual center tap to generate a back EMF signal.

Abstract translation: 差分电路的第一输入耦合到用于多相无刷直流电动机的第一相的线圈抽头。 第一相与电浮动线圈相关联。 差分电路的第二输入耦合到虚拟中心抽头。 分压器电路耦合在用于多相无刷直流电动机的其它相的线圈抽头之间以限定虚拟中心抽头。 当第一相电浮动时，其他相是电动机运行的相位。 用于第一阶段的线圈分接头与虚拟中心抽头电隔离。 差分电路对第一阶段的线圈抽头的电压与虚拟中心抽头的电压进行比较，以产生反电动势信号。