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    Electric motor drive isolation circuit
    3.
    发明授权
    Electric motor drive isolation circuit 有权
    电机驱动隔离电路

    公开(公告)号：US09496708B2

    公开(公告)日：2016-11-15

    申请号：US14678388

    申请日：2015-04-03

    Applicant: Allegro MicroSystems, LLC

    Inventor： Edward Chappell ,  Robert D. Christie ,  James McIntosh ,  Peter Morris

    IPC: H02H7/08 ,  H02H7/122

    CPC classification number: H02H7/08 ,  H02H7/0844 ,  H02H7/1227 ,  H02P29/0241

    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.

    Abstract translation: 隔离电路耦合在电机驱动器半桥电路和电动马达之间。 马达控制器电路将马达驱动信号提供给马达驱动器半桥电路。 隔离电路包括与电动机绕组串联耦合的晶体管。 低功率到中等功率二极管耦合在参考电压源和晶体管的控制端之间。

    Multi-stage slew rate control profiling for transistor drive applications
    4.
    发明授权
    Multi-stage slew rate control profiling for transistor drive applications 有权
    晶体管驱动应用的多级转换速率控制分析

    公开(公告)号：US09294084B1

    公开(公告)日：2016-03-22

    申请号：US14554396

    申请日：2014-11-26

    Applicant: Allegro Microsystems, LLC

    Inventor： James McIntosh ,  Robert D. Christie ,  Colin Hall ,  Alistair Wood

    IPC: H03K3/00 ,  H03K17/16 ,  H03K17/12

    CPC classification number: H03K17/165 ,  H03K17/04123 ,  H03K17/122 ,  H03K17/127 ,  H03K17/162 ,  H03K17/168 ,  H03K2217/0063 ,  H03K2217/0072

    Abstract: 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.

    Abstract translation: 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。

    CONTROLLER AREA NETWORK (CAN) TRANSMITTER
    5.
    发明申请
    CONTROLLER AREA NETWORK (CAN) TRANSMITTER 有权

    公开(公告)号：US20250132946A1

    公开(公告)日：2025-04-24

    申请号：US18491886

    申请日：2023-10-23

    Applicant: Allegro MicroSystems, LLC

    Inventor： Thomas Ross ,  James McIntosh

    IPC: H04L12/40 ,  H04B3/04

    Abstract: A CAN transmitter includes an output branch, a replica branch including a replica of the output branch, and a feedback network. The output branch includes a first resistive element controlled by a first bias voltage and a second resistive element controlled by a second bias voltage. The replica branch has a feedback node that is replicated at a midpoint between the CANH bus terminal and the CANL bus terminal. The feedback network has a first input coupled to the feedback node, a second input configured to receive a midpoint reference voltage indicative of a desired midpoint voltage between the CANH and CANL terminals, and an output at which the first bias voltage is provided. A resistance controller is coupled to a control terminal of the second resistive element and configured to generate the second bias voltage based on a predetermined reference voltage and a bias current.

    Level shifter with state reinforcement circuit
    6.
    发明授权
    Level shifter with state reinforcement circuit 有权

    公开(公告)号：US10979051B1

    公开(公告)日：2021-04-13

    申请号：US16907511

    申请日：2020-06-22

    Applicant: Allegro MicroSystems, LLC

    Inventor： Thomas Ross ,  James McIntosh

    IPC: H03K19/0185 ,  H03K19/20

    Abstract: In one aspect, an integrated circuit (IC) includes a level shifter configured to generate a first output signal and a second output signal, and to receive an input voltage, a first supply voltage and a second supply voltage; and a state reinforcement circuit configured to maintain a logical state of the second output signal in response to the first supply voltage having a voltage below ground and the input voltage is logical high. If the input voltage is logical high, then the first output signal is logical low and the second output signal is logical high; and, if the input voltage is logical low, the first output signal is logical high and the second output signal is logical low.

    Multi-mode charge pump
    8.
    发明授权
    Multi-mode charge pump 有权

    公开(公告)号：US10483846B1

    公开(公告)日：2019-11-19

    申请号：US16426444

    申请日：2019-05-30

    Applicant: Allegro MicroSystems, LLC

    Inventor： Gianluca Allegrini ,  Thomas Ross ,  James McIntosh

    IPC: H02M3/07 ,  H02J7/00

    Abstract: A multi-mode charge pump generates a regulated voltage at an output node from a battery input voltage. The multi-mode charge pump has a plurality of flying capacitors and a plurality of switches coupled to the flying capacitors in order to selectively couple the flying capacitors to the battery, the output node or a reference potential. The regulated voltage is provided across a storage capacitor coupled to the flying capacitors, and the regulated voltage is input to a comparator. The comparator also receives a reference voltage and compares the regulated voltage to the reference voltage to generates an asynchronous regulation signal. A controller in the multi-mode charge pump can automatically transition between operation modes such as a buck mode, a doubler mode and a tripler mode by controlling actuation of the switches in response to the asynchronous regulation signal and clock signals.

    Circuits and techniques for voltage monitoring of a solid-state isolator
    9.
    发明授权
    Circuits and techniques for voltage monitoring of a solid-state isolator 有权

    公开(公告)号：US10084407B2

    公开(公告)日：2018-09-25

    申请号：US14940558

    申请日：2015-11-13

    Applicant: Allegro Microsystems, LLC

    Inventor： Christy Looby ,  James McIntosh

    IPC: H02P6/12 ,  H02P29/02 ,  H02P6/00 ,  G01R31/26 ,  G01R19/165

    CPC classification number: H02P25/18 ,  G01R19/16519 ,  G01R31/2621 ,  G01R31/3277 ,  H02P6/12

    Abstract: An isolation switch driver includes a control circuit to control conduction of an isolation switch and a voltage monitor circuit to monitor a control voltage coupled to the isolation switch and to generate a fault indication if the control voltage is less than a predetermined threshold. The isolator driver can drive an isolation switch coupled between a bridge network and a motor in a motor control system. The monitor circuit can monitor a voltage between a gate terminal and a source terminal of the isolation switch and include a resistive element coupled between the gate terminal and the source terminal to generate a current proportional to the VGS voltage, a current mirror to shift a level of the current to a reference potential, and a comparator to compare the level-shifted current to a threshold current.

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