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1. 发明申请

WO2022164541A1 MOTOR CONTROLLER WITH STALL DETECTION 审中-公开
公开(公告)号：WO2022164541A1
公开(公告)日：2022-08-04
申请号：PCT/US2021/064273
申请日：2021-12-20
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： KHOSRAVI, Kamyar , KURIHARA, Masahira , ADIB, Andrew
IPC分类号： H02P29/02
摘要： A motor control system for controlling operation of a motor having a plurality of windings includes a gate driver to provide a control signal to one or more switching elements controlling a voltage applied to the plurality of windings and a Field Oriented Control (FOC) controller configured to generate a PWM signal for coupling to the gate driver, wherein the FOC controller comprises a d-axis control loop configured to generate an applied d-axis voltage and a q-axis control loop configured to generate an applied q-axis voltage. A stall detector is configured to calculate an estimate of the q-axis voltage and compare the applied q-axis voltage to a threshold based on the estimate in order to detect a stall condition of the motor.

2. 发明申请

WO2021021333A1 MAGNETIC FIELD SENSOR AND METHOD HAVING REDUCED FALSE SWITCHING 审中-公开
公开(公告)号：WO2021021333A1
公开(公告)日：2021-02-04
申请号：PCT/US2020/038025
申请日：2020-06-17
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： DAVID, Paul, A. , TAYLOR, William, P.
IPC分类号： G01D5/14 , G01R33/00 , G01R33/09 , G01R33/07
摘要： A magnetic field sensor (100,200) includes a substrate (102,202) and first and second magnetic field sensing elements (104, A-D) responsive to a magnet, comprising first and second magnetoresistance elements, respectively. At one or more positions of the magnet relative to the first and second magnetic field sensing elements while the magnet is stopped moving, at least one of the magnetic field sensing elements is in saturation in response to the magnet. A third magnetic field sensing element (E) proximate to the first and second magnetoresistance elements is operable to generate a third magnetic field sensing element signal responsive to the magnet, wherein, at the one or more positions while the magnet is stopped moving, the third magnetic field sensing element is not in saturation in response to the magnet or saturates at a higher magnetic field than the first and second magnetic field sensing elements in response to the magnet.

3. 发明申请

WO2021007001A1 MAGNETIC FIELD SENSOR WITH REDUCED INFLUENCE OF EXTERNAL STRAY MAGNETIC FIELDS 审中-公开
公开(公告)号：WO2021007001A1
公开(公告)日：2021-01-14
申请号：PCT/US2020/038026
申请日：2020-06-17
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： LASSALLE-BALIER, Rémy , RIOULT, Maxime , DAGA, Jean-Michel
IPC分类号： G01D5/14 , G01R33/00 , G01R33/07 , G01R33/09
摘要： A magnetic field sensor responsive to a movement of a target object can include a plurality of magnetoresistance elements arranged in a line and having a span according to y(1-1/x), where y is equal a full spatial period of the target object and where x is equal to a total quantity of magnetoresistance elements in the plurality of magnetoresistance elements. The plurality of magnetic field sensing elements is operable to generate a signal that is substantially not responsive to the movement of the target object but is responsive to stray external magnetic fields.

4. 发明申请

WO2018048768A1 SIGNALLING OF FAULTS IN A SPEED SENSOR 审中-公开
标题翻译：速度传感器故障信号传输
公开(公告)号：WO2018048768A1
公开(公告)日：2018-03-15
申请号：PCT/US2017/050014
申请日：2017-09-05
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： PRENTICE, Seth , FINNEMAN, Michael
IPC分类号： G01P21/02
摘要： In one aspect, an integrated circuit (IC) includes a sensor. The sensor includes a processor configured to provide speed and/or direction of a target object based on the speed of the target object. The processor monitors for a diagnostic fault which is a low level fault which still allows to detect speed; if such a diagnostic fault is detected, information about the fault is transmitted. The processor also monitors for critical faults, which do not allow to determine speed any more. In this case, the occurrence of such a critical fault is reported. The processor continues to monitor the fault, and only once the sensor recovers from the critical fault, data and information bits are transmitted.
摘要翻译：在一个方面，集成电路（IC）包括传感器。传感器包括处理器，该处理器被配置为基于目标物体的速度提供目标物体的速度和/或方向。处理器监视诊断故障，该故障是仍然允许检测速度的低水平故障; 如果检测到这样的诊断故障，则发送关于故障的信息。处理器还监视关键故障，这不允许再判断速度。在这种情况下，会报告发生这种严重故障。处理器继续监视故障，只有当传感器从严重故障中恢复时，才会传输数据和信息位。

5. 发明申请

WO2016200637A1 MAGNETIC FIELD SENSOR FOR ANGLE DETECTION WITH A PHASE-LOCKED LOOP 审中-公开
标题翻译：用于具有相位锁定环的角度检测的磁场传感器
公开(公告)号：WO2016200637A1
公开(公告)日：2016-12-15
申请号：PCT/US2016/034931
申请日：2016-05-31
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： DAUBERT, Steven
IPC分类号： G01R33/00 , G01R33/07
CPC分类号： G01R33/077 , G01R33/0041 , G01R33/075
摘要： A magnetic field sensor includes a phase-locked loop to receive a measured magnetic field signal formed from sensing element output signals of a plurality of magnetic field sensing elements in response to a magnetic field. The phase-locked loop is configured to generate an angle signal having a value indicative of the angle of the magnetic field. Associated methods are also described.
摘要翻译：磁场传感器包括锁相环，用于响应于磁场接收由多个磁场感测元件的感测元件输出信号形成的测量的磁场信号。锁相环被配置为产生具有指示磁场角度的值的角度信号。还描述了相关方法。

6. 发明申请

WO2010083007A2 DIRECTION DETECTION SENSOR 审中-公开
标题翻译：方向检测传感器
公开(公告)号：WO2010083007A2
公开(公告)日：2010-07-22
申请号：PCT/US2009/068910
申请日：2009-12-21
申请人： ALLEGRO MICROSYSTEMS, INC. , FERNANDEZ, Devon , TAYLOR, William, P. , MORRIS, Michael , SCHELLER, P., Karl , SHOEMAKER, Eric
发明人： FERNANDEZ, Devon , TAYLOR, William, P. , MORRIS, Michael , SCHELLER, P., Karl , SHOEMAKER, Eric
IPC分类号： G01D5/246
CPC分类号： G01B7/30 , G01D5/145 , G01D5/2451 , G01R33/072 , G01R33/091
摘要： A sensor responsive to movement of a detection target includes a magnetic field transducer operative to provide a magnetic field signal proportional to a magnetic field associated with the detection target, a peak detector for tracking positive and negative peaks of the magnetic field signal to generate a tracking signal, and a comparator having a first input responsive to the magnetic field signal, a second input responsive to an input signal related to the tracking signal, and an output at which is provided an output signal comprising first pulses having a first pulse width when the detection target moves in a first direction and second pulses having a second pulse width when the detection target moves in a second direction.
摘要翻译：响应于检测目标的移动的传感器包括磁场传感器，该磁场传感器可操作以提供与与检测目标相关联的磁场成比例的磁场信号;峰值检测器，用于跟踪磁场信号的正峰值和负峰值以产生跟踪信号，以及具有响应于磁场信号的第一输入的比较器，响应于与跟踪信号相关的输入信号的第二输入，以及输出，在该输出处提供包括具有第一脉冲宽度的第一脉冲的输出信号，检测目标在第一方向上移动，并且当检测目标沿第二方向移动时具有第二脉冲宽度的第二脉冲。

7. 发明申请

WO2007084199A1 METHODS AND APPARATUS FOR MAGNETIC ARTICLE DETECTION 审中-公开
标题翻译：用于磁性物品检测的方法和装置
公开(公告)号：WO2007084199A1
公开(公告)日：2007-07-26
申请号：PCT/US2006/040465
申请日：2006-10-16
申请人： ALLEGRO MICROSYSTEMS, INC. , VOISINE, Cory , FERNANDEZ, Devon , SCHELLER, Karl , VIG, Ravi , DOOGUE, Kirsten
发明人： VOISINE, Cory , FERNANDEZ, Devon , SCHELLER, Karl , VIG, Ravi , DOOGUE, Kirsten
IPC分类号： G01D5/247 , G01R33/06 , G01B7/14 , G01P3/487
CPC分类号： G01P3/487 , G01D5/147 , G01P3/481
摘要： Apparatus and methods for detecting passing magnetic articles using a first, True Power On State (TPOS) detector during a first time interval and transitioning to a second, running mode detector after the first time interval, when the output of the second detector is accurate. A phase comparator is responsive to the output signal of the first and second detectors and provides a control signal indicative of a change in the phase relationship between the two output signals. An output switch controlled by the phase comparator provides, as the detector output signal, the first detector output signal during the first time interval and the second detector output signal thereafter.
摘要翻译：在第一时间间隔期间，当第二检测器的输出是准确的时候，在第一时间间隔之后，使用第一，真实开启状态（TPOS）检测器检测通过磁性物品并转换到第二运行模式检测器的装置和方法。相位比较器响应于第一和第二检测器的输出信号，并且提供指示两个输出信号之间的相位关系变化的控制信号。由相位比较器控制的输出开关作为检测器输出信号，提供第一时间间隔期间的第一检测器输出信号，此后提供第二检测器输出信号。

8. 发明申请

WO2017204974A1 GAIN EQUALIZATION FOR MULTIPLE AXIS MAGNETIC FIELD SENSING 审中-公开
标题翻译：多轴磁场检测的增益均衡
公开(公告)号：WO2017204974A1
公开(公告)日：2017-11-30
申请号：PCT/US2017/029588
申请日：2017-04-26
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： LATHAM, Alexander , PETRIE, Craig S.
IPC分类号： G01D5/14
摘要： A magnetic field sensor for sensing external magnetic fields on multiple axes comprises a coil structure and a gain equalization circuit. The coil structure generates reference fields on magnetic field sensing elements in each axis. The gain equalization circuit measures and compares reference fields to generate gain-equalized output signals responsive to the external magnetic fields.
摘要翻译：用于感测多轴上的外部磁场的磁场传感器包括线圈结构和增益均衡电路。线圈结构在每个轴上的磁场感测元件上产生参考场。增益均衡电路测量并比较参考场，以产生响应外部磁场的增益均衡输出信号。

9. 发明申请

WO2017136136A1 MOTOR CONTROL CURRENT ZERO CROSSING DETECTOR 审中-公开
标题翻译：电机控制电流零交叉检测器
公开(公告)号：WO2017136136A1
公开(公告)日：2017-08-10
申请号：PCT/US2017/013741
申请日：2017-01-17
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： ALLEGRINI, Gianluca , ROSS, Thomas , MCINTOSH, James , CHRISTIE, Robert, Douglas
IPC分类号： H02P6/182
CPC分类号： H02P6/18 , H02P6/085 , H02P6/182
摘要： A driver circuit for driving a load, such as a multi-phase motor, includes a gate driver for providing a control signal to switching elements coupled to the driver circuit. A first switching element is coupled between a high supply voltage and a switching node of the load, and a second switching element is coupled between the switching node and a low supply voltage. To detect zero crossings of a current through the load, a zero crossing detector includes a first counter coupled to the switching node and a second counter coupled to the control signal. The first counter and second counter count in a predetermined direction based on a detected voltage of the switching node and based on a detected voltage of the control signal, respectively. The zero crossing detector generates an output signal based upon the difference between the first and the second counter.
摘要翻译：用于驱动诸如多相电动机的负载的驱动器电路包括用于向耦合到驱动器电路的开关元件提供控制信号的栅极驱动器。第一开关元件耦合在高电源电压和负载的开关节点之间，第二开关元件耦合在开关节点和低电源电压之间。为了检测通过负载的电流的过零点，零交叉检测器包括耦合到开关节点的第一计数器和耦合到控制信号的第二计数器。第一计数器和第二计数器基于检测到的开关节点的电压并基于检测到的控制信号的电压分别在预定方向上进行计数。零交叉检测器基于第一和第二计数器之间的差异产生输出信号。

10. 发明申请

WO2016195956A1 MAGNETIC FIELD SENSOR FOR ORIENTATION INDEPENDENT SPEED AND DIRECTION MEASUREMENT 审中-公开
标题翻译：用于定向的磁场传感器独立速度和方向测量
公开(公告)号：WO2016195956A1
公开(公告)日：2016-12-08
申请号：PCT/US2016/032021
申请日：2016-05-12
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： FOLETTO, Andrea , FRIEDRICH, Andreas, P.
IPC分类号： G01D5/14 , G01R33/07
CPC分类号： G01D5/142 , G01D5/145 , G01D5/16 , G01R33/072 , G01R33/091
摘要： A magnetic field sensor that provides target speed and direction detection that is independent of sensor-to-target orientation includes at least three differential channels, each responsive to a pair of magnetic field sensing elements to generate a respective magnetic field channel signal. A combining element is configured to generate a combined signal based on the first, second, and third magnetic field channel signals and control circuitry responsive to the combined signal and to at least one of the first, second, and third magnetic field channel signals generates a sensor output signal that indicative of target speed and direction.
摘要翻译：提供独立于传感器到目标取向的目标速度和方向检测的磁场传感器包括至少三个差分通道，每个差分通道响应一对磁场感测元件以产生相应的磁场通道信号。组合元件被配置为基于第一，第二和第三磁场通道信号和控制电路产生响应于组合信号的组合信号，并且第一，第二和第三磁场通道信号中的至少一个产生一个传感器输出信号，表示目标速度和方向。

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