CN111213389B - 开关放大器输出处的电流测量 - Google Patents

开关放大器输出处的电流测量 Download PDF

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Publication number
CN111213389B
CN111213389B CN201880068257.7A CN201880068257A CN111213389B CN 111213389 B CN111213389 B CN 111213389B CN 201880068257 A CN201880068257 A CN 201880068257A CN 111213389 B CN111213389 B CN 111213389B
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China
Prior art keywords
current
switch
load
circuit
transistor switch
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Application number
CN201880068257.7A
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English (en)
Chinese (zh)
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CN111213389A (zh
Inventor
申旦
L.克雷斯皮
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Synaptics Inc
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Synaptics Inc
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Publication of CN111213389A publication Critical patent/CN111213389A/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/185—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only with field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C27/00—Electric analogue stores, e.g. for storing instantaneous values
    • G11C27/02—Sample-and-hold arrangements
    • G11C27/024—Sample-and-hold arrangements using a capacitive memory element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)
CN201880068257.7A 2017-10-20 2018-10-18 开关放大器输出处的电流测量 Active CN111213389B (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US15/789,907 US11041890B2 (en) 2017-10-20 2017-10-20 Current measurement at a switching amplifier output
US15/789907 2017-10-20
PCT/US2018/056585 WO2019079646A1 (en) 2017-10-20 2018-10-18 CURRENT MEASUREMENT AT A SWITCH AMPLIFIER OUTPUT

Publications (2)

Publication Number Publication Date
CN111213389A CN111213389A (zh) 2020-05-29
CN111213389B true CN111213389B (zh) 2022-06-21

Family

ID=66169871

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201880068257.7A Active CN111213389B (zh) 2017-10-20 2018-10-18 开关放大器输出处的电流测量

Country Status (4)

Country Link
US (1) US11041890B2 (enExample)
JP (1) JP7295852B2 (enExample)
CN (1) CN111213389B (enExample)
WO (1) WO2019079646A1 (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102577482B1 (ko) * 2019-01-15 2023-09-12 상하이 어위닉 테크놀러지 컴퍼니., 리미티드 확성기용 전류 검출 회로
CN111505440B (zh) * 2020-04-27 2022-09-20 云南拓普特种电源科技有限公司 一种基于d类功放的接地故障检测以及保护系统及方法
US11742789B2 (en) * 2020-12-23 2023-08-29 Stmicroelectronics S.R.L. Current monitor circuit, corresponding system and method
TWI757016B (zh) * 2020-12-30 2022-03-01 茂達電子股份有限公司 電容性揚聲器驅動電路
KR20220131578A (ko) * 2021-03-22 2022-09-29 매그나칩 반도체 유한회사 슬루율 가속 회로 및 이를 포함하는 버퍼 회로

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201490975U (zh) * 2009-05-14 2010-05-26 广州飞达音响专业器材有限公司 一种数字功率放大器

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US5535438A (en) * 1994-05-10 1996-07-09 Panasonic Technologies, Inc. Phase linear class E amplifier for a satellite communication terminal which communicates with a low earth orbiting satellite
US6600618B2 (en) * 1998-09-21 2003-07-29 Stmicroelectronics, Inc. Time domain voice coil motor control circuit and method
US6865417B2 (en) * 2001-11-05 2005-03-08 Cameron Health, Inc. H-bridge with sensing circuit
JP4553790B2 (ja) 2004-05-17 2010-09-29 三星電子株式会社 スイッチング増幅器の過電流防止方法及び装置
JP2008160776A (ja) 2006-12-26 2008-07-10 Funai Electric Co Ltd Ｄ級増幅器
US8610501B2 (en) 2009-11-16 2013-12-17 Covidien Lp Class resonant-H electrosurgical generators
US8143944B2 (en) * 2010-08-23 2012-03-27 Texas Instruments Incorporated Method and apparatus for sensing a current for varying impedance loads
US9553501B2 (en) * 2010-12-08 2017-01-24 On-Bright Electronics (Shanghai) Co., Ltd. System and method providing over current protection based on duty cycle information for power converter
US8508298B2 (en) 2011-03-10 2013-08-13 Silicon Laboratories Inc. Amplifier using master-slave control scheme
US8963634B2 (en) 2012-02-28 2015-02-24 Qualcomm Incorporated Load current sensing
TWI508430B (zh) 2012-08-30 2015-11-11 Anpec Electronics Corp 具有防爆音功能之單端輸出ｄ類放大器
JP6486385B2 (ja) * 2014-01-21 2019-03-20 インフィネオン テクノロジーズ オーストリア アクチエンゲゼルシャフト 集積化ハイサイド・ゲート・ドライバー構造、及びハイサイド・パワー・トランジスターを駆動する回路
US9733276B2 (en) 2015-11-30 2017-08-15 Nxp B.V. Precise current measurement with chopping technique for high power driver
ITUB20156907A1 (it) * 2015-12-07 2017-06-07 St Microelectronics Srl Amplificatore audio in classe d comprendente un circuito per leggere una corrente erogata dall'amplificatore al carico e relativo procedimento di lettura

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Publication number Priority date Publication date Assignee Title
CN201490975U (zh) * 2009-05-14 2010-05-26 广州飞达音响专业器材有限公司 一种数字功率放大器

Also Published As

Publication number Publication date
JP7295852B2 (ja) 2023-06-21
US11041890B2 (en) 2021-06-22
US20190120883A1 (en) 2019-04-25
CN111213389A (zh) 2020-05-29
JP2021500787A (ja) 2021-01-07
WO2019079646A1 (en) 2019-04-25

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