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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.
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公开(公告)号：US12179617B2
公开(公告)日：2024-12-31
申请号：US17826822
申请日：2022-05-27
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Priyank Anand , Ashish Ojha , Krishnamurthy Shankar , Venkatesh Guduri
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.
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公开(公告)号：US20230044791A1
公开(公告)日：2023-02-09
申请号：US17397156
申请日：2021-08-09
Applicant: Texas Instruments Incorporated
Inventor： Ashish Ojha , Krishnamurthy Shankar , Siddhartha Gopal Krishna , Priyank Anand , Ganapathi Hegde
Abstract: An apparatus for regulating a slew time of an output voltage of a motor driver system includes a gate current control circuit which has a first input coupled to receive a target slew time and a second input coupled to receive a slew time. The gate current control circuit provides an incremented gate current if the slew time is greater than the target slew time and provides a decremented gate current if the slew time is less than the target slew time. The apparatus includes a gate driver which has a first input coupled to receive a PWM signal and a second input coupled to receive the gate current. The gate driver provides a gate drive signal.
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公开(公告)号：US12113521B2
公开(公告)日：2024-10-08
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
CPC classification number: 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.
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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
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.
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Patent Agency Ranking
公开(公告)号：US10931216B1
公开(公告)日：2021-02-23
申请号：US16747673
申请日：2020-01-21
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Krishnamurthy Shankar , Venkata Naresh Kotikelapudi
Abstract: A stepper driver for a motor includes an H-bridge, a sense transistor coupled to the H-bridge, a voltage-to-current (Vtol) converter, and a sine digital-to-analog converter (DAC). The Vtol converter has a Vtol converter input and a Vtol converter output. The Vtol converter output is coupled to the sense transistor. The sine DAC has a sine DAC digital input, a reference input, and a sine DAC output. The sine DAC output is coupled to the Vtol converter input. The sine DAC includes an R-2R network, an offset control circuit coupled to the R-2R network, and a gain control circuit also coupled to the R-2R network.
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公开(公告)号：US11923799B2
公开(公告)日：2024-03-05
申请号：US17397156
申请日：2021-08-09
Applicant: Texas Instruments Incorporated
Inventor： Ashish Ojha , Krishnamurthy Shankar , Siddhartha Gopal Krishna , Priyank Anand , Ganapathi Hegde
CPC classification number: H02P7/29 , H02H9/001 , H03K17/165
Abstract: An apparatus for regulating a slew time of an output voltage of a motor driver system includes a gate current control circuit which has a first input coupled to receive a target slew time and a second input coupled to receive a slew time. The gate current control circuit provides an incremented gate current if the slew time is greater than the target slew time and provides a decremented gate current if the slew time is less than the target slew time. The apparatus includes a gate driver which has a first input coupled to receive a PWM signal and a second input coupled to receive the gate current. The gate driver provides a gate drive signal.
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公开(公告)号：US20230382246A1
公开(公告)日：2023-11-30
申请号：US17826822
申请日：2022-05-27
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Priyank Anand , Ashish Ojha , Krishnamurthy Shankar , Venkatesh Guduri
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.
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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
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.
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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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