公开(公告)号：US11968503B2

公开(公告)日：2024-04-23

申请号：US17755882

申请日：2020-09-24

Applicant: SHANGHAI AWINIC TECHNOLOGY CO., LTD

Inventor： Zhifei Yang ,  Haijun Zhang ,  Liming Du ,  Jiantao Cheng ,  Hongjun Sun

IPC: H03G11/00 ,  G01R19/25 ,  H04R3/00 ,  H04R29/00

CPC classification number: H04R3/007 ,  G01R19/2509

Abstract: A current detection circuit and method for protecting a speaker, and a chip are provided. The current detection circuit includes a current detection module and an analog-to-digital converter. The current detection module samples a current flowing through the speaker based on current mirror technology, and converts the current into a voltage to output a first voltage signal and a second voltage signal. The analog-to-digital converter converts the first voltage signal and the second voltage signal into a PDM code, to calculate a current parameter of the speaker.

公开(公告)号：US11770120B2

公开(公告)日：2023-09-26

申请号：US17764699

申请日：2020-09-22

Applicant: SHANGHAI AWINIC TECHNOLOGY CO., LTD

Inventor： Zhifei Yang ,  Haijun Zhang ,  Liming Du ,  Jiantao Cheng ,  Hongjun Sun ,  Yongqing Qiao

IPC: H03K17/04 ,  H03K17/041

CPC classification number: H03K17/04106 ,  H03K2217/0081

Abstract: A bootstrap circuit supporting fast charging and discharging and a chip. A voltage measurement module (12) and a switch module (11) are arranged, and the voltage measurement module (12) controls an operating state of the switch module (11); during charging, under a specific condition, the switch module (11) is enabled to be in an on state so as to achieve fast charging of a voltage output end; and during discharging, the purpose of fast discharging is achieved by means of a second field effect transistor (MP5) arranged in the bootstrap circuit.

公开(公告)号：US11698393B2

公开(公告)日：2023-07-11

申请号：US17423346

申请日：2020-01-13

Applicant: SHANGHAI AWINIC TECHNOLOGY CO., LTD

Inventor： Zhifei Yang ,  Haijun Zhang ,  Wei Yao ,  Liming Du ,  Jiantao Cheng

IPC: G01R19/00 ,  H03F3/217 ,  H04R3/00

CPC classification number: G01R19/0069 ,  H03F3/217 ,  H04R3/00

Abstract: The present disclosure provides a current detection circuit for a loudspeaker 500, comprising a first detection resistor RSP, a second detection resistor RSN, a sampling selection circuit 100, an input selection circuit 200, and a processing circuit 300. By adding the sampling selection circuit 100 and the input selection circuit 200, voltages on two ends of the corresponding detection resistors (RSP, RSN) are sampled according to the fact that potential differences of an output stage VOP and an output stage VON of a class-D audio power amplifier 400 are in different semi-periods, and the current of the loudspeaker 500 is obtained through processing, thereby detecting the current of the loudspeaker 500 without adding an anti-clipping distortion function to the class-D audio power amplifier 400.

公开(公告)号：US10992222B2

公开(公告)日：2021-04-27

申请号：US16224417

申请日：2018-12-18

Applicant: Shanghai Awinic Technology Co., LTD

Inventor： Zhifei Yang ,  Haijun Zhang ,  Wei Yao ,  Jianing Zhou ,  Liming Du

IPC: H02J7/00 ,  H02M3/07 ,  G01R19/10 ,  H02J7/34

Abstract: A detection circuit and an electronic device using the detection circuit are provided. The detection circuit includes a fourth branch, a fifth branch and a third energy storage unit. The fourth branch includes multiple fourth switches, and the fifth branch includes multiple fifth switches. A preset electrical signal threshold is sampled and applied to the third energy storage unit by controlling the multiple fourth switches in the fourth branch, and a voltage difference between two detection terminals of a first energy storage unit is sampled and applied to the third energy storage unit by controlling the multiple fifth switches in the fifth branch, to compare the voltage difference between the two detection terminals with the preset electrical signal threshold.