公开(公告)号：US20230067055A1

公开(公告)日：2023-03-02

申请号：US17463001

申请日：2021-08-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Shyamsunder BALASUBRAMANIAN ,  Michael Edwin BUTENHOFF ,  Toshio YAMANAKA

IPC: H03K3/013 ,  H03K3/012 ,  H03K3/356

Abstract: A system includes a level shifter coupled to a voltage source, a first transistor, and a second transistor. The system also includes a first current source coupled to the first transistor and the second transistor and configured to bias the first transistor and the second transistor. The system includes a slew detector coupled to the voltage source and to the first current source, where the slew detector is configured to detect a change in voltage of the voltage source, and further configured to provide current to the first current source responsive to detecting the change. The system also includes a second current source coupled in parallel to the first current source, where the second current source is configured to provide current to the first current source responsive to a control signal.

公开(公告)号：US20200177179A1

公开(公告)日：2020-06-04

申请号：US16205576

申请日：2018-11-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Michael Edwin BUTENHOFF ,  Rakesh RAJA ,  Anuj JAIN

IPC: H03K17/687

Abstract: A transistor, e.g., field effect transistor FET, ringing adjustment circuit and method comprising the measuring of a voltage from a transistor (e.g., a node of a FET) during the transistor turning on and turning off, determining the voltage oscillation in the measured voltage by performing a derivative function on the measured voltage and detecting a switch in a voltage change rate from positive to negative or negative to positive, and comparing the voltage change rate after the detected switch to adjust drive current applied to the transistor to optimize efficiency while minimizing voltage oscillation and ringing.

公开(公告)号：US20200153429A1

公开(公告)日：2020-05-14

申请号：US16190784

申请日：2018-11-14

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Michael Edwin BUTENHOFF ,  Rakesh RAJA ,  Nicholas James OBORNY

IPC: H03K17/687 ,  H03K7/08 ,  H02P29/00 ,  G01R31/333

Abstract: An electronic circuit includes a first switch driver, a second switch driver, and a switch node coupled to the first and second switch drivers, and configured to couple to a motor. The electronic circuit also includes slew rate measurement circuitry coupled to the switch node and configured to measure a slew rate of switching operations at the switch node. The electronic circuit also includes a controller coupled to the first switch driver, to the second switch driver, and to the slew rate measurement circuitry, and configured to compare a measured slew rate provided by the slew rate measurement circuitry with a target slew rate, and to selectively adjust control signals to at least one of the first and second switch drivers based on a comparison result. The first and second switch drivers are configured to drive switches to power the motor based on the control signals.