公开(公告)号：US20250091458A1

公开(公告)日：2025-03-20

申请号：US18961768

申请日：2024-11-27

Applicant: Texas Instruments Incorporated

Inventor： Priyank Anand ,  Ashish Ojha ,  Krishnamurthy Shankar ,  Venkatesh Guduri

IPC: B60L53/16 ,  B60L53/62

Abstract: Examples of contactor controllers, systems and methods enable quick-turn-off (QTO) using an output voltage of a contactor controller when its supply voltage is below a threshold but does not interfere with QTO when sufficient supply voltage is available. In an example, when VM loss occurs, a high-side (HS) clamp of a contactor controller is disabled, and a low-side (LS) clamp current is generated using the output voltage. The LS clamp current may be adjusted to achieve a desired QTO voltage. In another example, a HS clamp is disabled and the charging of the gate of a LS field-effect transistor (FET) is enabled only when the output voltage increases above a power-off QTO threshold (less than the LS clamp voltage); the QTO voltage is set by a voltage detection and comparison circuit of the contactor controller.

公开(公告)号：US12021517B2

公开(公告)日：2024-06-25

申请号：US17866128

申请日：2022-07-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sachin S ,  Subramanian Narayan ,  Krishnamurthy Shankar

IPC: H03K17/687 ,  H02M1/08 ,  H02P27/04

CPC classification number: H03K17/6871 ,  H02M1/08 ,  H02P27/04 ,  H03K2217/0063 ,  H03K2217/0072

Abstract: A gate driver includes a gate current circuit and a driver logic circuit. The gate current circuit has a gate current circuit output and includes first and second current sources coupled to the gate current circuit output. The driver logic circuit has a capacitor and is configured to: charge and discharge the capacitor to generate a detect voltage across the capacitor; cause the first current from the first current source to flow to the gate current circuit output in response to a voltage on the gate current circuit output being below the detect voltage; and cause the second current from the second current source to flow to the gate current circuit output in response to the voltage on the gate current circuit output being above the detect voltage.

公开(公告)号：US11811342B2

公开(公告)日：2023-11-07

申请号：US17101861

申请日：2020-11-23

Applicant: Texas Instruments Incorporated

Inventor： Chinmay Jain ,  Kalpana Suryawanshi ,  Priyank Anand ,  Ashish Ojha ,  Krishnamurthy Shankar

IPC: H05B41/282 ,  H02P23/14 ,  H03H17/02 ,  G06F1/04 ,  H03K5/24 ,  H03M1/12

CPC classification number: H02P23/14 ,  G06F1/04 ,  H03H17/02 ,  H03K5/24 ,  H03M1/12

Abstract: Disclosed is a ripple counter with a dynamic bandpass filter for a DC motor. The ripple counter includes a current sense amplifier configured to provide an analog voltage responsive to an inline current in rotor windings of the DC motor. The ripple counter also includes an analog-to-digital converter configured to provide a digital signal responsive to the analog voltage. The ripple counter also includes a digital filter configured to receive the digital signal and a clock signal and configured to vary a frequency response to provide a filtered ripple current. The ripple counter also includes a digital comparator circuit configured to receive the filtered ripple current and to provide a pulsed output. The ripple counter also includes a clock generator configured to detect the frequency of the pulsed output and to provide the clock signal responsive to the detected frequency.

公开(公告)号：US11716072B1

公开(公告)日：2023-08-01

申请号：US17682619

申请日：2022-02-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ashish Ojha ,  Priyank Anand ,  Anand Gopalan ,  Krishnamurthy Shankar

IPC: H03K3/00 ,  H03K3/011 ,  H03K17/687

CPC classification number: H03K3/011 ,  H03K17/6874 ,  H03K2217/0063 ,  H03K2217/0072

Abstract: Examples of contactor controllers, systems and methods time-modulate levels of high-side (HS) and low-side (LS) clamp voltages in a contactor controller to switch a path through which current flows during quick-turn-off (QTO) of the contactor controller. One of the clamp voltages is at a high level and the other is at a low level. The output voltage of the contactor controller is held at the low level. The path switching may be a function of one or more parameters. In a configuration, the level of a supply voltage of the contactor controller is monitored and used to control the path switching. In a configuration, temperatures of HS and LS transistors of the contactor controller are monitored and used to control the path switching. Control of the path switching may be performed to dissipate power in a larger area to increase thermal performance of the contactor controller. Both clamps may remain active throughout the QTO process, providing redundancy and safety.

公开(公告)号：US20220166357A1

公开(公告)日：2022-05-26

申请号：US17101861

申请日：2020-11-23

Applicant: Texas Instruments Incorporated

Inventor： Chinmay Jain ,  Kalpana Suryawanshi ,  Priyank Anand ,  Ashish Ojha ,  Krishnamurthy Shankar

IPC: H02P23/14 ,  H03H17/02 ,  H03M1/12 ,  H03K5/24 ,  G06F1/04

Abstract: Disclosed is a ripple counter with a dynamic bandpass filter for a DC motor. The ripple counter includes a current sense amplifier configured to provide an analog voltage responsive to an inline current in rotor windings of the DC motor. The ripple counter also includes an analog-to-digital converter configured to provide a digital signal responsive to the analog voltage. The ripple counter also includes a digital filter configured to receive the digital signal and a clock signal and configured to vary a frequency response to provide a filtered ripple current. The ripple counter also includes a digital comparator circuit configured to receive the filtered ripple current and to provide a pulsed output. The ripple counter also includes a clock generator configured to detect the frequency of the pulsed output and to provide the clock signal responsive to the detected frequency.