WO2004004114A3 - System and method for protecting an audio amplifier output stage power transistor - Google Patents

System and method for protecting an audio amplifier output stage power transistor

Info

Publication number
WO2004004114A3
WO2004004114A3 PCT/US2003/020190 US0320190W WO2004004114A3 WO 2004004114 A3 WO2004004114 A3 WO 2004004114A3 US 0320190 W US0320190 W US 0320190W WO 2004004114 A3 WO2004004114 A3 WO 2004004114A3
Authority
WO
WIPO (PCT)
Prior art keywords
output transistor
protecting
estimate
audio amplifier
output stage
Prior art date
Application number
PCT/US2003/020190
Other languages
French (fr)
Other versions
WO2004004114A2 (en
Inventor
Eric Mendenhall
Original Assignee
Gibson Guitar Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gibson Guitar Corp filed Critical Gibson Guitar Corp
Priority to AU2003261089A priority Critical patent/AU2003261089A1/en
Publication of WO2004004114A2 publication Critical patent/WO2004004114A2/en
Publication of WO2004004114A3 publication Critical patent/WO2004004114A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3069—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Abstract

A system and method for protecting an output transistor in an audio amplifier output stage includes a protection circuit (10) that protects the output transistor (22) from excessive currents and voltages, and does not interfere with the normal operation of the output transistor (22). The protection circuit (10) generates an estimate of the power dissipated by the output transistor (22), adjusts that estimate so that it varies with the temperature of the output transistor, and filters the time varying power estimate to obtain a filtered estimate of the power dissipated by the output transistor. When the filtered estimateexceeds a predetermined transistor power limit, the protection circuit (10) reduces the power dissipated by the output transistor (22).
PCT/US2003/020190 2002-06-26 2003-06-26 System and method for protecting an audio amplifier output stage power transistor WO2004004114A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003261089A AU2003261089A1 (en) 2002-06-26 2003-06-26 System and method for protecting an audio amplifier output stage power transistor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39165002P 2002-06-26 2002-06-26
US60/391,650 2002-06-26

Publications (2)

Publication Number Publication Date
WO2004004114A2 WO2004004114A2 (en) 2004-01-08
WO2004004114A3 true WO2004004114A3 (en) 2004-04-29

Family

ID=30000728

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/020190 WO2004004114A2 (en) 2002-06-26 2003-06-26 System and method for protecting an audio amplifier output stage power transistor

Country Status (3)

Country Link
US (1) US7061740B2 (en)
AU (1) AU2003261089A1 (en)
WO (1) WO2004004114A2 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7616462B2 (en) * 2004-03-12 2009-11-10 Mks Instruments, Inc. Power supply controller to actively drive a load current when the load current exceeds a set point
US8044329B2 (en) * 2005-04-11 2011-10-25 Watlow Electric Manufacturing Company Compact limiter and controller assembly and method
US7652888B2 (en) * 2005-04-11 2010-01-26 Watlow Electric Manufacturing Company Controller housing with connector retention assembly and method
US20060249507A1 (en) * 2005-04-11 2006-11-09 Watlow Electric Manufacturing Company Modular controller user interface and method
US20060229740A1 (en) * 2005-04-11 2006-10-12 Watlow Electric Manufacturing Company Portable user interface assembly and method
US20060230297A1 (en) * 2005-04-11 2006-10-12 Watlow Electric Manufacturing Company Electronic device mounting assembly and method
US20080145536A1 (en) * 2006-12-13 2008-06-19 Applied Materials, Inc. METHOD AND APPARATUS FOR LOW TEMPERATURE AND LOW K SiBN DEPOSITION
US8437111B1 (en) * 2007-10-11 2013-05-07 Adtran, Inc. Systems and methods for current limiting with overload protection
WO2010097715A1 (en) 2009-02-25 2010-09-02 Nxp B.V. Method and apparatus for maintaining circuit stability
US8634491B2 (en) 2010-03-10 2014-01-21 Rockstar Consortium USLP Method and apparatus for reducing the contribution of noise to digitally sampled signals
US8822802B1 (en) * 2011-06-24 2014-09-02 James Mark McGillivary System and method for generating musical distortion in an audio amplifier
AU2013205395B1 (en) * 2013-04-23 2014-01-16 Robert Bosch (Australia) Pty Ltd Method of constraining a safe operating area locus for a power semiconductor device
US9191737B2 (en) 2013-08-07 2015-11-17 Bose Corporation Crest-factor based gain modification
US9903764B2 (en) * 2014-09-30 2018-02-27 Samsung Electronics Co., Ltd. Integrated circuit for estimating power of at least one node using temperature and a system including the same
KR20180069954A (en) * 2016-12-15 2018-06-26 현대자동차주식회사 Method for measuring junction temperature of power module

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021701A (en) * 1975-12-08 1977-05-03 Motorola, Inc. Transistor protection circuit
US4471323A (en) * 1981-11-19 1984-09-11 Trilling Ted R Protection circuits for complementary direct-coupled amplifiers

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781839A (en) * 1972-01-07 1973-12-25 Texas Instruments Inc Fluid flow sensing device
US3979745A (en) * 1974-02-22 1976-09-07 Westronics, Inc. System and method for linearizing analog measurements during analog-to-digital conversion
US4243946A (en) 1978-05-19 1981-01-06 Wang Chien S Class-B current source amplifier
US4330809A (en) 1979-12-31 1982-05-18 Crown International, Inc. Thermal protection circuit for the die of a transistor
US4611180A (en) 1985-01-09 1986-09-09 Crown International, Inc. Grounded bridge amplifier protection through transistor thermo protection
US4644288A (en) 1985-01-09 1987-02-17 Crown International, Inc. Method of fault sensing for power amplifiers having coupled power stages with normally alternate current flow
US6039471A (en) * 1996-05-22 2000-03-21 Integrated Device Technology, Inc. Device for simulating dissipation of thermal power by a board supporting an electronic component
US5734261A (en) * 1996-11-05 1998-03-31 National Instruments Corporation Input protection circuit which includes optocoupler protection during over-voltage conditions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021701A (en) * 1975-12-08 1977-05-03 Motorola, Inc. Transistor protection circuit
US4471323A (en) * 1981-11-19 1984-09-11 Trilling Ted R Protection circuits for complementary direct-coupled amplifiers

Also Published As

Publication number Publication date
AU2003261089A1 (en) 2004-01-19
US7061740B2 (en) 2006-06-13
AU2003261089A8 (en) 2004-01-19
US20040109276A1 (en) 2004-06-10
WO2004004114A2 (en) 2004-01-08

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