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1. 发明申请

WO2015167822A1 SYSTEMS AND METHODS FOR SENSING CURRENT THROUGH A LOW-SIDE FIELD EFFECT TRANSISTOR 审中-公开
标题翻译：通过低端场效应晶体管感测电流的系统和方法
公开(公告)号：WO2015167822A1
公开(公告)日：2015-11-05
申请号：PCT/US2015/026332
申请日：2015-04-17
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： MCINTOSH, James , CHRISTIE, Robert, D. , BRYCE, Douglas , WILSON, Walter Morrison, Stewart
IPC分类号： G01R19/165 , H02P8/12
CPC分类号： H03K17/6871 , A61B17/1626 , B26B19/00 , B26B19/06 , G01R19/16538 , G01R19/16571 , H02P8/12 , H02P31/00
摘要： Systems and techniques detecting a reverse current are disclosed. An apparatus comprises a switching circuit coupled to a load and a reference node. The switching circuit may be capable of conducting a reverse current from the reference node to the load when a voltage at the load is lower than a voltage at the reference node. A voltage source has a first terminal coupled to the load, a second terminal configured to follow a voltage at the load, and produces a voltage proportional to a voltage drop across the switching circuit. A comparator circuit is coupled to compare a voltage at the second terminal of the voltage source to the voltage at the reference node and configured to indicate when the reverse current has a magnitude greater than a predetermined threshold.
摘要翻译：公开了检测反向电流的系统和技术。一种装置包括耦合到负载和参考节点的开关电路。当负载电压低于参考节点处的电压时，开关电路可能能够从参考节点向负载传导反向电流。电压源具有耦合到负载的第一端子，被配置为跟随负载处的电压的第二端子，并产生与开关电路两端的电压降成比例的电压。比较器电路被耦合以将电压源的第二端子处的电压与参考节点处的电压进行比较，并且被配置为指示何时反向电流具有大于预定阈值的幅度。

2. 发明申请

WO2017095601A1 NON-LINEAR TRANSMIT BIASING FOR A SERIAL BUS TRANSMITTER 审中-公开
标题翻译：串行总线发送器的非线性发送偏置
公开(公告)号：WO2017095601A1
公开(公告)日：2017-06-08
申请号：PCT/US2016/061261
申请日：2016-11-10
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： ROSS, Thomas , TOGNERI, Aldo , MCINTOSH, James , ALLEGRINI, Gianluca
IPC分类号： H04L12/40 , H03K5/08
CPC分类号： G06F13/364 , G06F13/404 , G06F13/4282 , H03K5/08 , H03K19/018521 , H04L12/40032 , H04L2012/40234
摘要： Described embodiments provide a transmitter for transmitting data over a serial bus coupled to the transmitter. The transmitter includes a controller to generate data for transmission by the transmitter. A transmit driver is coupled to the controller. The transmit driver, in response to the generated data for transmission, generates logic transitions on the serial bus. The transmit driver generates low-to-high logic transitions by charging the serial bus by a bus current based on a predetermined initial bias level for a first time period, and a first predetermined maximum bias level for a second time period. The transmit driver generates high-to-low logic transitions by discharging the serial bus by a bus current based on a pre-charged level of the transmit driver, and a second predetermined maximum bias level for a third time period.
摘要翻译：所描述的实施例提供了一种用于通过耦合到发射机的串行总线发送数据的发射机。发射机包括控制器以产生供发射机发射的数据。发射驱动器连接到控制器。发送驱动器响应所产生的数据传输，在串行总线上产生逻辑转换。发送驱动器通过基于第一时间段的预定初始偏置电平和第二时间段的第一预定最大偏置电平通过总线电流对串行总线充电来生成低至高逻辑转换。发送驱动器通过基于发送驱动器的预充电电平的总线电流和第三预定最大偏置电平持续第三时间段，通过对串行总线进行放电来生成高至低逻辑转换。

3. 发明申请

WO2016085611A1 MULTI-STAGE SLEW RATE CONTROL PROFILING FOR TRANSISTOR DRIVE APPLICATIONS 审中-公开
标题翻译：用于晶体管驱动应用的多级速率控制分布
公开(公告)号：WO2016085611A1
公开(公告)日：2016-06-02
申请号：PCT/US2015/057920
申请日：2015-10-29
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： MCINTOSH, James , CHRISTIE, Robert, D. , HALL, Colin , WOOD, Alistair
IPC分类号： H03K17/0412 , H03K17/16
CPC分类号： H03K17/165 , H03K17/04123 , H03K17/122 , H03K17/127 , H03K17/162 , H03K17/168 , H03K2217/0063 , H03K2217/0072
摘要： A transistor drive circuit uses multi-stage slew rate control to drive one or more switching transistors. After a decision is made to change transistor state, a first drive current may be applied to an input terminal of the transistor for a predetermined time duration. After the predetermined time duration, a second drive current may be applied to the input terminal. When the transition between states is substantially complete, the current drive to the input terminal may be changed to a voltage drive. In some embodiments, the predetermined time duration may be based on the start time of a Miller plateau during the transition period.
摘要翻译：晶体管驱动电路使用多级压摆率控制来驱动一个或多个开关晶体管。在做出改变晶体管状态的决定之后，可以将第一驱动电流施加到晶体管的输入端子一段预定的持续时间。在预定的持续时间之后，可以向输入端施加第二驱动电流。当状态之间的转变基本上完成时，到输入端的当前驱动可以改变为电压驱动。在一些实施例中，预定持续时间可以基于在过渡期间的米勒平台的开始时间。

4. 发明申请

WO2014158386A2 SYSTEMS AND METHODS FOR DRIVING A LOAD UNDER VARIOUS POWER CONDITIONS 审中-公开
标题翻译：用于驱动各种功率条件下的负载的系统和方法
公开(公告)号：WO2014158386A2
公开(公告)日：2014-10-02
申请号：PCT/US2014/015701
申请日：2014-02-11
申请人： ALLEGRO MICROSYSTEMS, LLC
发明人： MCINTOSH, James , LOOBY, Christy
IPC分类号： H02M1/08
CPC分类号： H03K17/00 , H02M1/08 , H03K17/08122
摘要： An electronic circuit for driving an electronic switch includes a first voltage terminal coupled to receive a first voltage from a power supply and a second voltage terminal coupled to receive a second voltage from the power supply. A driver circuit is configured to drive the voltage at a control terminal of the electronic switch to an intermediate voltage level in order to turn on the electronic switch during a high or normal voltage condition. A clamp circuit is configured to clamp the voltage at the control terminal of the electronic switch to the second voltage terminal in order to turn on the electronic switch during a low voltage condition, so that the electronic switch can enhance power provided to a load during the low voltage condition. A low voltage detection circuit detects the low voltage condition and provides a signal to activate the clamp circuit.
摘要翻译：用于驱动电子开关的电子电路包括耦合以从电源接收第一电压的第一电压端子和耦合以从电源接收第二电压的第二电压端子。驱动电路被配置为将电子开关的控制端子处的电压驱动到中间电压电平，以在高电压或正常电压条件下接通电子开关。钳位电路被配置为将电子开关的控制端子处的电压钳位到第二电压端子，以在低电压条件下接通电子开关，使得电子开关可以增强在电力开关期间提供给负载的功率低电压条件。低电压检测电路检测低电压状态并提供信号以激活钳位电路。

5. 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。

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