公开(公告)号：US09099978B2

公开(公告)日：2015-08-04

申请号：US13692789

申请日：2012-12-03

Applicant: STMicroelectronics (Shenzhen) R&D CO. LTD. ,  STMicroelectronics, S.r.l.

Inventor： XiangSheng Li ,  Cristiano Meroni ,  Mei Yang ,  XianFeng Xiong

IPC: H03G11/00 ,  H03F1/52 ,  H03G3/34 ,  H03F3/21

CPC classification number: H03G3/348 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H03F2200/321 ,  H03F2200/375 ,  H03F2200/471 ,  H03F2200/78 ,  H03G11/00 ,  H04R1/00 ,  H04R3/007 ,  H04R2201/028 ,  H04R2499/13

Abstract: A method of operating a speaker system including a speaker coupled to an amplifier, and a dedicated digital speaker protection circuit includes turning on the amplifier in a mute mode, after a first delay period, issuing a play command to the amplifier to place the amplifier in a play mode, but without an input signal during a second delay period, and performing a speaker offset detection during the second delay period, wherein, if there is an offset, then the amplifier is forced back into the mute mode, and if there is no offset, then the amplifier is allowed to continue to operate in the play mode. The method also includes issuing a speaker protection control signal or command if an offset is detected.

Abstract translation: 一种操作包括耦合到放大器的扬声器的扬声器系统和专用数字扬声器保护电路的方法包括：在第一延迟周期之后，以静音模式接通放大器，向放大器发出放大指令以放大放大器 播放模式，但是在第二延迟时段期间没有输入信号，并且在第二延迟周期期间执行扬声器偏移检测，其中，如果存在偏移，则放大器被强制回到静音模式，并且如果存在 无偏移，则允许放大器在播放模式下继续工作。 如果检测到偏移，该方法还包括发出扬声器保护控制信号或命令。

公开(公告)号：US12231102B2

公开(公告)日：2025-02-18

申请号：US18493282

申请日：2023-10-24

Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd.

Inventor： XiangSheng Li ,  Ru Feng Du

IPC: H03G3/30 ,  H03F3/187 ,  H04R3/00 ,  H04R29/00

Abstract: An audio amplifier includes: a buck controller configured to control an output voltage at a first supply terminal, the output voltage selected from a set including a plurality of output voltages, where the output voltage takes a settling time to settle; a first audio bridge including: a class-AB driver stage coupled to the first supply terminal, and a delay insertion circuit configured to receive a processed digital stream and provide the processed digital stream to the class-AB driver stage a delay time after receiving the processed digital stream, where the delay time is based on the settling time; and an audio amplitude detector configured to detect a first peak amplitude in the first digital audio stream, where the buck controller is configured to select a lowest output voltage from the set that is higher than the first peak amplitude plus a headroom voltage.

公开(公告)号：US10944366B2

公开(公告)日：2021-03-09

申请号：US16291971

申请日：2019-03-04

Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd.

Inventor： Ru Feng Du ,  XiangSheng Li

IPC: H03F1/52 ,  H03F3/21 ,  H03F3/189 ,  H03F3/24 ,  H03F3/45

Abstract: In an embodiment, a class-AB amplifier includes: an output stage that includes a pair of half-bridges configured to be coupled to a load; and a current sensing circuit coupled to a first half-bridge of the pair of half-bridges. The current sensing circuit includes a resistive element and is configured to sense a load current flowing through the load by: mirroring a current flowing through a first transistor of the first half-bridge to generate a mirrored current, flowing the mirrored current through the resistive element, and sensing the load current based on a voltage of the resistive element.

公开(公告)号：US10050595B2

公开(公告)日：2018-08-14

申请号：US15723622

申请日：2017-10-03

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics (Shenzhen) R&D Co. Ltd.

Inventor： XiangSheng Li ,  Cristiano Meroni ,  Mei Yang ,  Xian Feng Xiong

IPC: H03G11/00 ,  H04R3/00 ,  H03G3/34 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H04R1/00

Abstract: A circuit can be used in a speaker system. The circuit includes an amplifier with an output configured to be coupled to a speaker. An offset comparator has an input coupled the output of the amplifier and is configured to provide an offset control signal. A digital circuit has a first input coupled to an output of the offset comparator, a second input configured to receive an amplifier control signal, a third input configured to receive a play control signal, and an output configured to provide a forced mute signal that can be used to control the amplifier.

公开(公告)号：US09800221B2

公开(公告)日：2017-10-24

申请号：US15356269

申请日：2016-11-18

Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd. ,  STMicroelectronics S.r.l.

Inventor： XiangSheng Li ,  Cristiano Meroni ,  Mei Yang ,  Xian Feng Xiong

IPC: H04R3/00 ,  H03G11/00 ,  H03G3/34 ,  H03F1/52 ,  H03F3/21 ,  H03F3/183 ,  H04R1/00

CPC classification number: H03G3/348 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H03F2200/321 ,  H03F2200/375 ,  H03F2200/471 ,  H03F2200/78 ,  H03G11/00 ,  H04R1/00 ,  H04R3/007 ,  H04R2201/028 ,  H04R2499/13

Abstract: A circuit can be used in a speaker system. The circuit includes an amplifier with an output configured to be coupled to a speaker. An offset comparator has an input coupled the output of the amplifier and is configured to provide an offset control signal. A digital circuit has a first input coupled to an output of the offset comparator, a second input configured to receive an amplifier control signal, a third input configured to receive a play control signal, and an output configured to provide a forced mute signal that can be used to control the amplifier.

公开(公告)号：US20170070201A1

公开(公告)日：2017-03-09

申请号：US15356269

申请日：2016-11-18

Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd. ,  STMicroelectronics S.r.l.

Inventor： XiangSheng Li ,  Cristiano Meroni ,  Mei Yang ,  Xian Feng Xiong

IPC: H03G3/34 ,  H03F3/21 ,  H03F3/183 ,  H04R3/00

CPC classification number: H03G3/348 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H03F2200/321 ,  H03F2200/375 ,  H03F2200/471 ,  H03F2200/78 ,  H03G11/00 ,  H04R1/00 ,  H04R3/007 ,  H04R2201/028 ,  H04R2499/13

Abstract: A circuit can be used in a speaker system. The circuit includes an amplifier with an output configured to be coupled to a speaker. An offset comparator has an input coupled the output of the amplifier and is configured to provide an offset control signal. A digital circuit has a first input coupled to an output of the offset comparator, a second input configured to receive an amplifier control signal, a third input configured to receive a play control signal, and an output configured to provide a forced mute signal that can be used to control the amplifier.

Abstract translation: 电路可用于扬声器系统。 电路包括具有被配置为耦合到扬声器的输出的放大器。 偏移比较器具有耦合放大器的输出的输入，并被配置为提供偏移控制信号。 数字电路具有耦合到偏移比较器的输出的第一输入，被配置为接收放大器控制信号的第二输入，被配置为接收播放控制信号的第三输入和被配置为提供强制静音信号的输出， 用于控制放大器。

公开(公告)号：US09532142B2

公开(公告)日：2016-12-27

申请号：US15158854

申请日：2016-05-19

Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd. ,  STMicroelectronics S.r.l

Inventor： XiangSheng Li ,  Cristiano Meroni ,  Mei Yang ,  Xian Feng Xiong

IPC: H04R3/00 ,  H03G11/00 ,  H03F1/52 ,  H03G3/34 ,  H03F3/21 ,  H03F3/183 ,  H04R1/00

CPC classification number: H03G3/348 ,  H03F1/52 ,  H03F3/183 ,  H03F3/21 ,  H03F2200/321 ,  H03F2200/375 ,  H03F2200/471 ,  H03F2200/78 ,  H03G11/00 ,  H04R1/00 ,  H04R3/007 ,  H04R2201/028 ,  H04R2499/13

Abstract: A digital circuit can be used in a speaker system. An intermediate node provides a speaker protection control signal. A first latch for receives an offset control signal. A first logic gate receives a play control signal, the offset control signal, and the speaker protection control signal. A second logic gate is coupled to the first latch for receiving the play control signal and the speaker protection control signal. A second latch is coupled to the first logic gate for providing a forced mute signal. A third latch is coupled to the second logic gate and to the intermediate node.

Abstract translation: 数字电路可用于扬声器系统。 中间节点提供扬声器保护控制信号。 用于接收偏移控制信号的第一锁存器。 第一逻辑门接收播放控制信号，偏移控制信号和扬声器保护控制信号。 第二逻辑门耦合到第一锁存器，用于接收播放控制信号和扬声器保护控制信号。 第二锁存器耦合到第一逻辑门以提供强制静音信号。 第三锁存器耦合到第二逻辑门和中间节点。