公开(公告)号：US20170133962A1

公开(公告)日：2017-05-11

申请号：US14937248

申请日：2015-11-10

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Michele Boscolo Berto ,  Siro Vittoni

IPC: H02P6/14 ,  H02P6/18

CPC classification number: H02P6/182 ,  H02P6/157 ,  H02P6/185

Abstract: A control circuit controls the operation of a brushless DC (BLDC) sensorless motor having a first terminal connected to a first winding, a second terminal connected to a second winding and a third terminal connected to a third winding. A driver circuit applies drive signals to the first and second terminals and places the third terminal in a high-impedance state. The drive signals include first drive signals at a first current amplitude and second drive signals at a second current amplitude different from the first current amplitude. A differencing circuit senses a first mutual inductance voltage at the third terminal in response to the first drive signals and senses a second mutual inductance voltage at the third terminal in response to the second drive signals. The differencing circuit further determines a difference between the first and second mutual inductance voltages and produces a difference signal that is used for zero-crossing detection and rotor position sensing.

公开(公告)号：US09391551B2

公开(公告)日：2016-07-12

申请号：US14307643

申请日：2014-06-18

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Michele Boscolo Berto ,  Federico Magni

IPC: H02P6/18

CPC classification number: H02P6/182

Abstract: A device may detect the zero-cross event of a BEMF of an electric motor with first, second, and third phase windings driven by respective first, second, and third power driving stages. The device may include a control circuit configured to place at an impedance state the third power driving stage relative to the third phase winding, the third phase winding being coupled to a zero-cross detecting circuit, introduce a masking signal to mask an output signal of the zero-cross detecting circuit in correspondence with each rising edge of a first driving signal of the first power driving stage relative to the first phase winding, and determine whether a first duty-cycle of the first driving signal is such that a duration of a masking window of the masking signal is greater than an on-time period of the first driving signal.

Abstract translation: 装置可以检测由相应的第一，第二和第三电力驱动级驱动的第一，第二和第三相绕组的电动机的BEMF的零交叉事件。 该装置可以包括控制电路，其被配置为将第三功率驱动级相对于第三相绕组处于阻抗状态，第三相绕组耦合到零交叉检测电路，引入屏蔽信号以屏蔽 所述过零检测电路对应于所述第一驱动级相对于所述第一相绕组的第一驱动信号的每个上升沿，并且确定所述第一驱动信号的第一占空比是否为 屏蔽信号的屏蔽窗口大于第一驱动信号的接通时间段。