公开(公告)号：US20150036238A1

公开(公告)日：2015-02-05

申请号：US13956484

申请日：2013-08-01

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Lorenzo Ferrario ,  Kaufik Linggajaya

IPC: G11B5/54

CPC classification number: G11B5/022

Abstract: The back EMF (BEMF) of a motor is sensed and compared to a target back EMF (BEMF) to generate an error control signal. The circuit supply voltage is also sensed. A PWM motor control signal is generated in response to a comparison of the error control signal to a ramp signal having a variable slope. The variable slope is selected in response to the sensed circuit supply voltage. The motor is then driven in response to the PWM control signal. The sign of the error control signal is used to selectively short one of motor terminals to a reference voltage supply node while the other motor terminal is driven in response to the PWM control signal.

Abstract translation: 电动机的反电动势（BEMF）被感测并与目标反电动势（BEMF）进行比较以产生误差控制信号。 还检测电路电源电压。 响应于误差控制信号与具有可变斜率的斜坡信号的比较，产生PWM电动机控制信号。 响应于检测到的电路电源电压选择可变斜率。 然后根据PWM控制信号驱动电机。 误差控制信号的符号用于选择性地将一个电动机端子短路到参考电压供应节点，同时响应于PWM控制信号驱动另一个电动机端子。

公开(公告)号：US09236067B2

公开(公告)日：2016-01-12

申请号：US13956484

申请日：2013-08-01

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Lorenzo Ferrario ,  Kaufik Linggajaya

IPC: H02P6/18 ,  G11B5/02

CPC classification number: G11B5/022

Abstract: The back EMF (BEMF) of a motor is sensed and compared to a target back EMF (BEMF) to generate an error control signal. The circuit supply voltage is also sensed. A PWM motor control signal is generated in response to a comparison of the error control signal to a ramp signal having a variable slope. The variable slope is selected in response to the sensed circuit supply voltage. The motor is then driven in response to the PWM control signal. The sign of the error control signal is used to selectively short one of motor terminals to a reference voltage supply node while the other motor terminal is driven in response to the PWM control signal.

Abstract translation: 电动机的反电动势（BEMF）被感测并与目标反电动势（BEMF）进行比较以产生误差控制信号。 还检测电路电源电压。 响应于误差控制信号与具有可变斜率的斜坡信号的比较，产生PWM电动机控制信号。 响应于检测到的电路电源电压选择可变斜率。 然后根据PWM控制信号驱动电机。 误差控制信号的符号用于选择性地将一个电动机端子短路到参考电压供应节点，同时响应于PWM控制信号驱动另一个电动机端子。

公开(公告)号：US12255595B2

公开(公告)日：2025-03-18

申请号：US17371368

申请日：2021-07-09

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics Asia Pacific Pte Ltd.

Inventor： Marco Sautto ,  Giona Fucili ,  Valerio Lo Muzzo ,  Kaufik Linggajaya

IPC: H01L41/02 ,  H03H11/04 ,  H10N30/30

Abstract: In accordance with an embodiment, a method of operating a piezoelectric transducer configured to transduce mechanical vibrations into transduced electrical signals at a pair of sensor electrodes includes stimulating a resonant oscillation of the piezoelectric transducer by applying at least one pulse electrical stimulation signal to the pair of sensor electrodes; detecting, at the pair of sensor electrodes, at least one electrical signal resulting from the stimulated resonant oscillation, wherein the at least one electrical signal resulting from the stimulated resonant oscillation oscillates at a resonance frequency of the piezoelectric transducer; measuring a frequency of oscillation of the at least one electrical signal resulting from the stimulated resonant oscillation to obtain a measured resonance frequency of the piezoelectric transducer; and tuning a stopband frequency of a notch filter coupled to the piezoelectric transducer to match the measured resonance frequency of the piezoelectric transducer.

公开(公告)号：US20220021373A1

公开(公告)日：2022-01-20

申请号：US17371368

申请日：2021-07-09

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics Asia Pacific Pte Ltd.

Inventor： Marco Sautto ,  Giona Fucili ,  Valerio Lo Muzzo ,  Kaufik Linggajaya

IPC: H03H11/04 ,  H01L41/113

Abstract: In accordance with an embodiment, a method of operating a piezoelectric transducer configured to transduce mechanical vibrations into transduced electrical signals at a pair of sensor electrodes includes stimulating a resonant oscillation of the piezoelectric transducer by applying at least one pulse electrical stimulation signal to the pair of sensor electrodes; detecting, at the pair of sensor electrodes, at least one electrical signal resulting from the stimulated resonant oscillation, wherein the at least one electrical signal resulting from the stimulated resonant oscillation oscillates at a resonance frequency of the piezoelectric transducer; measuring a frequency of oscillation of the at least one electrical signal resulting from the stimulated resonant oscillation to obtain a measured resonance frequency of the piezoelectric transducer; and tuning a stopband frequency of a notch filter coupled to the piezoelectric transducer to match the measured resonance frequency of the piezoelectric transducer.

公开(公告)号：US10944341B2

公开(公告)日：2021-03-09

申请号：US16410674

申请日：2019-05-13

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Kaufik Linggajaya

IPC: H02P3/14 ,  G11B19/20

Abstract: The half-bridges driving a multiphase motor are controlled to perform a sequence of operations to support charging a hold capacitor. First, in a brake configuration, the half-bridge transistors are controlled such that either high-side transistors or low-side transistors of the half-bridges are turned on. Second, in an active step-up configuration, the half-bridge transistors are controlled such that the high-side transistor of a first half-bridge and the low-side transistor of a second half-bridge are both turned on and the low-side transistor of the first half-bridge and the high-side transistor of the second half-bridge are both turned off. Third, in an active brake configuration, the half-bridge transistors are controlled such that the low-side transistor of the first half-bridge and the high-side transistor of the second half-bridge are both turned on and the high-side transistor of the first half-bridge and the low-side transistor of the second half-bridge stage are both turned off.

公开(公告)号：US09000703B2

公开(公告)日：2015-04-07

申请号：US13687193

申请日：2012-11-28

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

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。