公开(公告)号：US20170350923A1

公开(公告)日：2017-12-07

申请号：US15612550

申请日：2017-06-02

Applicant: NXP B.V.

Inventor： Fred Mostert ,  Gertjan van Holland ,  Paul Wielage

IPC: G01R17/02 ,  H03F3/181

CPC classification number: G01R17/02 ,  G01R27/16 ,  G01R31/006 ,  G01R31/2825 ,  H03F3/181 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/165 ,  H03F2200/471 ,  H03M1/12 ,  H03M1/66 ,  H04R3/00 ,  H04R2420/05

Abstract: A method and apparatus of load detection for an audio amplifier system is described. A load detector includes a first load terminal and a second load terminal; a controller coupled to the first and second load terminals and configured to in a first control loop, vary a first current supplied to a first load terminal dependent on the difference between a first reference signal and the detected first load terminal voltage; and in a second control loop, vary a second current supplied to the second load terminal dependent on the difference between a second reference signal and the detected second load terminal voltage; and to determine a current through a load connected between the first load terminal and the second load terminal from the second current value, and a voltage across the load from the detected voltage difference between the first load terminal voltage and the second load terminal voltage.

公开(公告)号：US10698007B2

公开(公告)日：2020-06-30

申请号：US15612550

申请日：2017-06-02

Applicant: NXP B.V.

Inventor： Fred Mostert ,  Gertjan van Holland ,  Paul Wielage

IPC: G01R17/02 ,  H03F3/217 ,  H04R3/00 ,  G01R31/28 ,  H03F3/181 ,  H03M1/12 ,  G01R27/16 ,  H03M1/66 ,  G01R31/00

Abstract: A method and apparatus of load detection for an audio amplifier system is described. A load detector includes a first load terminal and a second load terminal; a controller coupled to the first and second load terminals and configured to in a first control loop, vary a first current supplied to a first load terminal dependent on the difference between a first reference signal and the detected first load terminal voltage; and in a second control loop, vary a second current supplied to the second load terminal dependent on the difference between a second reference signal and the detected second load terminal voltage; and to determine a current through a load connected between the first load terminal and the second load terminal from the second current value, and a voltage across the load from the detected voltage difference between the first load terminal voltage and the second load terminal voltage.