公开(公告)号：US20240012035A1

公开(公告)日：2024-01-11

申请号：US18347715

申请日：2023-07-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Kapil R. SHARMA ,  Kathryn R. HOLLAND ,  Matthew PETHERBRIDGE ,  Peter HSU ,  John B. BOWLERWELL

IPC: G01R19/00

CPC classification number: G01R19/0092

Abstract: This application relates to methods and apparatus for sensing current in a monitored current path, where the monitored current path is bidirectional such that current can flow in either direction along the monitored current path. A current sensor has first and second sense resistors (401a, 401b) configured to each pass a current corresponding to the current in the monitored current path. The first and second sense resistors are configured to have a matching arrangement, such that current flow through the first sense resistor when current is flowing in one direction in the monitored current path matches current flow through the second sense resistor when current is flowing in the opposite direction in the monitored current path.

公开(公告)号：US20210364560A1

公开(公告)日：2021-11-25

申请号：US17118330

申请日：2020-12-10

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Kathryn R. HOLLAND ,  Bo-Ren WANG ,  Ravi K. KUMMARAGUNTLA ,  Graeme G. MACKAY ,  Christian LARSEN

IPC: G01R27/02 ,  H01C1/14 ,  H01C1/16 ,  H01C17/00

Abstract: An apparatus may include a sense resistor comprising a plurality of parallel-coupled resistor elements, a plurality of positive voltage sense points, and a plurality of negative voltage sense points. A first passive combination network may be configured to combine the plurality of positive voltage sense points into a single positive sense terminal and a second passive combination network may be configured to combine the plurality of negative voltage sense points into a single negative sense terminal. The first passive combination network and the second passive combination network may be arranged such that a sense voltage is measurable between the single positive sense terminal and the single negative sense terminal and a dependence of the sense voltage on a variation in current density in the parallel-coupled resistor elements is minimized.

公开(公告)号：US20220268721A1

公开(公告)日：2022-08-25

申请号：US17185514

申请日：2021-02-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ravi K. KUMMARAGUNTLA ,  Kathryn R. HOLLAND

IPC: G01N27/14 ,  G01R19/00

Abstract: The present disclosure relates to circuitry for determining a temperature coefficient value of a resistor. The circuitry comprises circuitry for supplying an AC current signal to the resistor, circuitry for measuring a first voltage across the resistor when the AC current signal is supplied; and processing circuitry configured to determine the temperature coefficient value based on the first voltage.