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    Systems and Methods for Regulation of Propagation Delay in DC Motor Drivers
    1.
    发明申请
    Systems and Methods for Regulation of Propagation Delay in DC Motor Drivers 有权

    公开(公告)号：US20230039198A1

    公开(公告)日：2023-02-09

    申请号：US17397133

    申请日：2021-08-09

    Applicant: Texas Instruments Incorporated

    Inventor： Ashish Ojha ,  Krishnamurthy Shankar ,  Siddhartha Gopal Krishna ,  Priyank Anand ,  Ganapathi Hegde

    IPC: H03K17/687 ,  H02P23/00 ,  H03K5/24

    Abstract: A control circuit regulates the propagation delay of a field effect transistor (FET) before the FET transitions to the Miller region by applying a pre-charge current for a fixed duration to the gates of the FET. After the fixed duration, the current is reduced to a lower drive current level which is based on a desired output voltage slew rate. After the FET transitions to the Miller region, the output voltage slews down in accordance with the output voltage slew rate. By regulating the slew-rate of the output voltage in the Miller region and regulating the propagation delay of the FET prior to the Miller region, the control circuit reduces electromagnetic interference (EMI) caused by the switching of the FET, thereby improving electromagnetic compatibility (EMC) of switch mode driver systems without increasing the propagation delay of the FET.

    Over-current protection circuit
    3.
    发明授权
    Over-current protection circuit 有权

    公开(公告)号：US11469586B2

    公开(公告)日：2022-10-11

    申请号：US16862674

    申请日：2020-04-30

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Ashish Ojha ,  Krishnamurthy Shankar ,  Divyasree J ,  Siddhartha Gopal Krishna ,  Sarangan Thirumavalavan

    IPC: H02H3/00 ,  H02H3/08 ,  H03K5/24 ,  H02H1/00

    Abstract: A circuit includes a first transistor, a second transistor, and a sense transistor. The first current terminals of the first and second transistors are coupled together at a power supply node. The control terminals of the second and third transistors are coupled together. The second current terminals of the first, second, and third transistors are coupled together. The sense resistor is coupled between the first current terminals of the first and second transistors and the first current terminal of the third transistor. The first and second transistors are configured such that during a first mode of operation, current to a load flows through the first and second transistors, and during a second mode of operation, current to a load is discontinued through the first transistor yet flows through the second transistor.

    Average current control in stepper motor
    9.
    发明授权
    Average current control in stepper motor 有权

    公开(公告)号：US11646684B2

    公开(公告)日：2023-05-09

    申请号：US16933583

    申请日：2020-07-20

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Krishnamurthy Shankar ,  Venkata Naresh Kotikelapudi ,  Siddhartha Gopal Krishna

    IPC: H02P8/12 ,  H02P8/22

    CPC classification number: H02P8/12 ,  H02P8/22

    Abstract: A stepper motor driver includes an H-bridge including first and second outputs. The H-bridge includes a low-side transistor coupled between the first output and a ground. A reference current circuit is configured to produce a reference current. The reference current circuit has a reference output. An averager circuit includes an input and output. The input of the averager circuit is coupled to the first output of the H-bridge. A comparator includes first and second comparator inputs. The first input of the comparator is coupled to the output of the average circuit and the second input of the comparator is coupled to the reference output.

    Open load detection circuits
    10.
    发明授权
    Open load detection circuits 有权

    公开(公告)号：US11255920B2

    公开(公告)日：2022-02-22

    申请号：US16785793

    申请日：2020-02-10

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Ashish Ojha ,  Siddhartha Gopal Krishna ,  Divyasree J ,  Krishnamurthy Shankar ,  Venkata Naresh Kotikelapudi

    IPC: G01R31/52 ,  H03K17/687

    Abstract: A circuit includes an input terminal, a first transistor, a second transistor, a comparator, a voltage reference circuit, and a control circuit. The first transistor includes a first terminal coupled to the input terminal. The second transistor includes a first terminal coupled to the input terminal. The comparator includes a first terminal coupled to the input terminal. The voltage reference circuit is coupled to a second terminal of the comparator. The control circuit includes an input, a first output, and a second output. The input is coupled to an output of the comparator. The first output is coupled to a second terminal of the first transistor. The second output is coupled to a second terminal of the second transistor.

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