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公开(公告)号：US20200287507A1
公开(公告)日：2020-09-10
申请号：US16291971
申请日：2019-03-04
Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd.
Inventor： Ru Feng Du , XiangSheng Li
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.
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公开(公告)号：US20180026598A1
公开(公告)日：2018-01-25
申请号：US15723622
申请日：2017-10-03
Inventor： XiangSheng Li , Cristiano Meroni , Mei Yang , Xian Feng Xiong
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.
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公开(公告)号：US11018644B2
公开(公告)日：2021-05-25
申请号：US16695010
申请日：2019-11-25
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： XiangSheng Li , Ru Feng Du
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.
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公开(公告)号：US20160269825A1
公开(公告)日：2016-09-15
申请号：US15158854
申请日：2016-05-19
Inventor： XiangSheng Li , Cristiano Meroni , Mei Yang , Xian Feng Xiong
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。
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5.发明授权Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design 有权输入钳位结构，用于汽车无线电类AB功率放大器设计中的音质改善公开(公告)号：US08970280B2
公开(公告)日：2015-03-03
申请号：US13707350
申请日：2012-12-06
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： Mei Yang , YueHua Wang , Xaut Zhang , Kelvin Wen , XiangSheng Li
CPC classification number: H03F3/211 , H03F3/187 , H03F3/26 , H03F3/4508 , H03F3/45475 , H03F3/68 , H03F2200/03 , H03F2203/21131 , H03F2203/45102 , H03F2203/45154 , H03F2203/45244 , H03F2203/45528 , H03F2203/45552
Abstract: A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages, and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
Abstract translation: 用于AB类放大器的钳位电路包括参考电压电路，具有耦合到参考电压电路的输入的四个NPN达林顿晶体管和用于提供四个钳位电压的输出，以及具有耦合到参考电压电路的输入的分离NPN达林顿晶体管 ，以及四个独立的输出，用于提供四个交流接地电压。
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Patent Agency Ranking
公开(公告)号：US20240056046A1
公开(公告)日：2024-02-15
申请号：US18493282
申请日：2023-10-24
Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd.
Inventor： XiangSheng Li , Ru Feng Du
CPC classification number: H03G3/3005 , H03F3/187 , H04R3/00 , H04R29/00 , H03F2200/03 , H03G2201/103
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.
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公开(公告)号：US11831286B2
公开(公告)日：2023-11-28
申请号：US17241980
申请日：2021-04-27
Applicant: STMicroelectronics (Shenzhen) R & D Co. Ltd.
Inventor： XiangSheng Li , Ru Feng Du
CPC classification number: H03G3/3005 , H03F3/187 , H04R3/00 , H04R29/00 , H03F2200/03 , H03G2201/103
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.
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公开(公告)号：US20210250010A1
公开(公告)日：2021-08-12
申请号：US17241980
申请日：2021-04-27
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： XiangSheng Li , Ru Feng Du
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.
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公开(公告)号：US20200169234A1
公开(公告)日：2020-05-28
申请号：US16695010
申请日：2019-11-25
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： XiangSheng Li , Ru Feng Du
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.
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10.发明授权Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design 有权输入钳位结构，用于汽车无线电类AB功率放大器设计中的音质改善公开(公告)号：US09331644B2
公开(公告)日：2016-05-03
申请号：US14599701
申请日：2015-01-19
Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD
Inventor： Mei Yang , YueHua Wang , Xaut Zhang , Kelvin Wen , XiangSheng Li
CPC classification number: H03F3/211 , H03F3/187 , H03F3/26 , H03F3/4508 , H03F3/45475 , H03F3/68 , H03F2200/03 , H03F2203/21131 , H03F2203/45102 , H03F2203/45154 , H03F2203/45244 , H03F2203/45528 , H03F2203/45552
Abstract: A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
Abstract translation: 用于AB类放大器的钳位电路包括参考电压电路，具有耦合到参考电压电路的输入的四个NPN达林顿晶体管和用于提供四个钳位电压的输出和具有耦合到参考电压电路的输入的分立NPN达林顿晶体管， 和四个单独的输出，用于提供四个交流接地电压。
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