WO2007049898A1 - Digital audio amplifier and digital audio amplifying method therefor - Google Patents

Digital audio amplifier and digital audio amplifying method therefor Download PDF

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Publication number
WO2007049898A1
WO2007049898A1 PCT/KR2006/004341 KR2006004341W WO2007049898A1 WO 2007049898 A1 WO2007049898 A1 WO 2007049898A1 KR 2006004341 W KR2006004341 W KR 2006004341W WO 2007049898 A1 WO2007049898 A1 WO 2007049898A1
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WO
WIPO (PCT)
Prior art keywords
audio signal
amplifier
output
pulse
integration circuit
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2006/004341
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English (en)
French (fr)
Inventor
Byoung-Min Mun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to JP2008535471A priority Critical patent/JP5415765B2/ja
Priority to CN200680036154XA priority patent/CN101278477B/zh
Priority to US12/090,278 priority patent/US7952426B2/en
Publication of WO2007049898A1 publication Critical patent/WO2007049898A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters
    • 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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
    • 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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/307—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in push-pull amplifiers
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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
    • 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
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/351—Pulse width modulation being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/504—Indexing scheme relating to amplifiers the supply voltage or current being continuously controlled by a controlling signal, e.g. the controlling signal of a transistor implemented as variable resistor in a supply path for, an IC-block showed amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/541—Transformer coupled at the output of an amplifier

Definitions

  • the present invention relates to a digital audio amplifier, and more particularly, to a digital audio signal amplifier in which both safety and power efficiency are achieved by integrating a switching mode power supply and a digital audio amplifier into one body, and a digital audio signal amplifying method appropriate for the amplifier are provided.
  • a digital audio system includes a direct current (DC) voltage supply unit generating a DC voltage from a commercial alternating current (AC) voltage; and a digital audio amplifier pulse-modulating the DC voltage using an audio signal, low- pass filtering the pulse-modulated DC voltage, and obtaining an output audio signal corresponding to the input audio signal.
  • DC direct current
  • AC alternating current
  • the DC voltage supply unit is required to have a function of insulating the commercial AC voltage from the digital audio amplifier. Accordingly, a switching mode power supply (SMPS) having an insulation transformer is generally used as the DC voltage supply unit.
  • the digital audio amplifier is generally a D class digital audio amplifier to increase the output power.
  • FlG. 1 is a block diagram of the structure of a conventional digital audio system.
  • the audio system 100 of FlG. 1 includes an SMPS 110 and a D class audio amplifier 130.
  • the SMPS 110 converts an input commercial AC voltage into a DC voltage using a first rectifying and smoothing unit 112, switches the DC voltage in a switching unit 116 operating at a rate corresponding to a pulse width modulation (PWM) signal having a frequency of tens to hundreds of kHz or higher generated in a PWM modulation unit 114, transforms the switched DC voltage with an insulation transformer having an appropriate winding ratio, rectifies the output of the insulation transformer 118 through a second rectifying and smoothing unit 120, and outputs the DC voltage. Also, though it is not shown, an error signal is fed back to adjust the frequency of a pulse modulated signal, and a duty rate, so that a constant DC voltage can be output irrespective of changes in the input voltage or output current.
  • PWM pulse width modulation
  • the insulation transformer 118 insulates the primary side, i.e., the commercial AC voltage source, from the second side, i.e., the digital audio amplifier 130. Also, an error signal detected in the secondary side is fed back to the PWM modulation unit 114 of the primary side through a photo coupler (not shown) to provide electrical isolation.
  • the primary side i.e., the commercial AC voltage source
  • the second side i.e., the digital audio amplifier 130.
  • an error signal detected in the secondary side is fed back to the PWM modulation unit 114 of the primary side through a photo coupler (not shown) to provide electrical isolation.
  • the D class digital audio amplifier 130 switches the DC voltage provided by the SMPS 110 at a D class output end 134 by a PWM audio signal generated in the PWM modulation unit 132, low-pass filters the switched DC voltage through a low-pass filter 136, and generates an output audio signal corresponding to the original audio signal. Meanwhile, though it is not shown, in order to stabilize the audio output a negative feedback signal is generated from the output of the insulation transformer 118 to control the pulse modulation of the PWM modulation unit 114.
  • FlG. 2 illustrates waveform diagrams showing the operation of the D class digital audio amplifier 130 shown in FlG. 1.
  • a PWM audio signal is obtained by modulating a 18OkHz or higher triangular wave carrier with an input audio signal of 2OkHz or lower.
  • the switched DC voltage is obtained by switching the DC voltage with this PWM audio signal.
  • the output audio signal is obtained by low- pass filtering the switched DC voltage.
  • the input audio signal is similar to the output audio signal. Disclosure of Invention
  • the conventional digital audio system as shown in FlG. 1 has a problem that the power efficiency is low and the manufacturing cost is high.
  • the power efficiency of the SMPS 110 is Pl and the power efficiency of the digital audio amplifier 130 is P2
  • the power efficiency Pt of a conventional digital audio system 100 is Pl x P2.
  • each of Pl and P2 has a value less than 1, Pt becomes less than Pl and P2, respectively. Accordingly, it can be seen that the conventional digital audio system 100 inevitably has low power efficiency.
  • the PWM modulation units 114 and 132 perform the same PWM modulation
  • the rectifying and smoothing units 112 and 120 perform the same rectifications
  • the switching unit 116 and the D class output end 134 perform the same switching operation. That is, it can be seen that the units performing the same operation are disposed redundantly, accordingly manufacturing costs are wasted.
  • the present invention provides a digital audio amplifier capable of increasing power efficiency and reducing manufacturing costs by eliminating redundant parts in an SMPS and a digital audio amplifier.
  • the present invention also provides a digital audio signal amplifying method capable of increasing power efficiency and reducing manufacturing costs.
  • the power consumption was 130 watts.
  • the power consumption was 111 watts, that is, power consumption was reduced by 19 watts.
  • the digital audio amplifier of the present invention by integrating a switching mode power supply and a digital audio amplifier into one, the digital audio amplifier satisfies the insulation requirement and at the same time increases power efficiency.
  • FIG. 1 is a block diagram of the structure of a conventional digital audio system
  • FIG. 2 illustrates waveform diagrams showing the operation of a D class digital audio amplifier shown in FIG. 1 ;
  • FIG. 3 is a block diagram of a structure of a digital audio amplifier according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a digital audio amplifier according to an embodiment of the present invention.
  • FIG. 5 illustrates an example of a full-bridge type digital audio amplifier according to an embodiment of the present invention
  • FIG. 6 illustrates an operation of a Schmitt trigger shown in FIG. 5;
  • FIG. 7 is a circuit diagram of a digital audio amplifier according to an embodiment of the present invention.
  • FIG. 8 is a circuit diagram of a digital audio amplifier according to another embodiment of the present invention.
  • FIG. 9 is a circuit diagram of a digital audio amplifier according to still another embodiment of the present invention.
  • a digital audio amplifier including: a pulse modulation unit generating a pulse modulated audio signal by pulse-modulating an input audio signal; a switching unit switching a direct current (DC) voltage based on the pulse modulated audio signal; an insulation transformer transforming the output of the switching unit and outputting the result of the transforming; and a low-pass filter obtaining an audio signal corresponding to the input audio signal by low-pass filtering the output of the insulation transformer, and outputting the audio signal.
  • a pulse modulation unit generating a pulse modulated audio signal by pulse-modulating an input audio signal
  • a switching unit switching a direct current (DC) voltage based on the pulse modulated audio signal
  • an insulation transformer transforming the output of the switching unit and outputting the result of the transforming
  • a low-pass filter obtaining an audio signal corresponding to the input audio signal by low-pass filtering the output of the insulation transformer, and outputting the audio signal.
  • the switching unit and the low-pass filter may be disposed on the primary side and on the secondary side, respectively, of the insulation transformer, and the digital audio amplifier may further include a photo coupler photo-coupling the pulse modulated audio signal and providing the result to the switching unit.
  • the pulse modulation unit may pulse-width modulate the input audio signal.
  • a digital audio amplifying method including: generating a pulse modulated audio signal by pulse-modulating an input audio signal; switching a DC voltage based on the pulse modulated audio signal and generating a switched DC voltage ; transforming the switched DC voltage through an insulation transformer; and low-pass filtering the output of the insulation transformer and outputting an output audio signal corresponding to the input audio signal.
  • FlG. 3 is a block diagram showing the structure of a digital audio amplifier according to an embodiment of the present invention.
  • the digital audio amplifier 300 shown in FlG. 3 includes a rectifying and smoothing unit 302, a pulse modulation unit 304, a switching unit 306, an insulation transformer 308, and a low-pass filter 310.
  • the rectifying and smoothing unit 302 converts a commercial AC voltage into a
  • the pulse modulation unit 304 pulse-modulates an input audio signal and provides the obtained pulse modulated audio signal to the switching unit 306.
  • the switching unit 306 switches the DC voltage provided by the rectifying and smoothing unit 302 using the pulse modulated audio signal and generates a switched DC voltage.
  • the insulation transformer 308 transforms and outputs the switched DC voltage output from the switching unit 306.
  • the low-pass filter 310 low-pass filters the output of the insulation transformer 308 and outputs an output audio signal corresponding to the input audio signal.
  • the output audio signal is provided to a speaker.
  • the commercial AC voltage is insulated from the low-pass filter 310 by the insulation transformer 308.
  • FlG. 4 is a circuit diagram of the digital audio amplifier 300 according to an embodiment of the present invention.
  • the pulse modulator 304 is disposed on the secondary side of the insulation transformer 308, and the PWM audio signal that is the output of the pulse modulator 304 is provided to the switching unit 306 disposed on the primary side of the insulation transformer 308, through a photo coupler 410.
  • the digital audio amplifier 300 includes a fuse 402, a filter 404 for preventing electromagnetic interference (EMI), capacitors 406 for noise-filtering between signal lines or between signal lines and the chassis, a negative feedback signal generator 408, the photo coupler 410 photo for coupling the pulse modulated audio signal generated in the pulse modulation unit 304, and a gate driver 412 for amplifying the output of the photo coupler 410 to a level which is enough to drive switching transistors 306a and 306b of the switching unit 306.
  • EMI electromagnetic interference
  • capacitors 406 for noise-filtering between signal lines or between signal lines and the chassis
  • a negative feedback signal generator 408 the photo coupler 410 photo for coupling the pulse modulated audio signal generated in the pulse modulation unit 304
  • a gate driver 412 for amplifying the output of the photo coupler 410 to a level which is enough to drive switching transistors 306a and 306b of the switching unit 306.
  • the rectifying and smoothing unit 302 includes a bridge rectifier 302a and a smoothing condenser 302b.
  • the switching unit 306 includes switching transistors 306a and 306b operating complementary to each other.
  • the switching unit 306 shown in FIG. 4 performs a switching operation corresponding to a half-bridge type D class digital audio amplifier.
  • the present invention is not limited to this and can be constructed to perform a switching operation corresponding to a full-bridge type D class digital audio amplifier.
  • FIG. 5 illustrates an example of a full-bridge type digital audio amplifier according to an embodiment of the present invention.
  • the insulation transformer 308 is composed of a ferrite core in order to reduce EMI and enhance efficiency.
  • the pulse modulator 304 includes an integration circuit 304a and a Schmitt trigger
  • the integration circuit 304a integrates an audio signal and a negative feedback signal, and the output of the Schmitt trigger 304b is oscillated by the output of the integration circuit 304a.
  • a PWM audio signal is obtained through the integration circuit 304a and the Schmitt trigger 304b.
  • FIG. 6 illustrates an operation of the Schmitt trigger shown in FIG. 5.
  • the Schmitt trigger 304b has two threshold voltages. For example, if an input voltage (Vin) becomes greater than a first threshold, the output voltage (Vout) is transited to logic level 1. Once the output voltage (Vout) becomes logic level 1, logic level 1 is maintained while the input voltage is between the first threshold voltage and a second threshold voltage. If the input voltage (Vin) becomes less than the second threshold voltage, the output voltage (Vout) returns to logic level 0.
  • the Schmitt trigger 304a outputs a pulse width modulated signal corresponding to the change in the output of the integration circuit 304a.
  • the PWM audio signal output from the pulse modulation unit 304 is provided to the gate driver 410 through the photo coupler 410.
  • the gate driver 410 amplifies the output of the photo coupler 410 to a level which is enough to drive the switching transistors 306a and 306b of the switching unit 306.
  • the DC voltage is switched, i.e., pulse width modulated, by a switching operation of the switching unit 306.
  • the output of the switching unit 306 is transformed through the insulation transformer 308, and low-pass filtered through the low-pass filter 310 and output as an output audio signal.
  • the negative feedback signal generator 408 is used to provide a stable output audio signal regardless of change in the input voltage and the output current.
  • the negative feedback signal generator 408 generates a negative feedback signal corresponding to the magnitude of the output audio signal, from the output of the insulation transformer 308.
  • the negative feedback signal generator 408 can be implemented simply, for example, by a resistor.
  • the negative feedback signal is provided to the integration circuit 304a.
  • the integration circuit 304a integrates the audio signal and the negative feedback signal, that is, amplifies the synthesized signal of the audio signal and the negative feedback signal.
  • FlG. 7 is a circuit diagram of a digital audio amplifier according to an embodiment of the present invention.
  • a pulse modulator 304 is disposed on the secondary side of an insulation transformer 308, and the PWM audio signal output from the pulse modulator 304 is provided to a switching unit 306 disposed on the primary side of the insulation transformer 308 through a photo coupler 410 as in the embodiment of FlG. 4.
  • the embodiment of FlG. 7 is different from that of FlG. 4 in that a comparator 304c is employed instead of the Schmitt trigger 304b.
  • the comparator 304c compares the output of an integration circuit 304a and a triangular wave carrier and outputs a PWM audio signal.
  • the operations of the comparator 304c and the digital audio amplifier 300 can be clearly understood with reference to the waveforms shown in FlG. 2.
  • FlG. 8 is a circuit diagram of a digital audio amplifier 300 according to another embodiment of the present invention. Unlike the embodiment of FlG. 4, in the embodiment of FlG. 4, a pulse modulator 304 is disposed on the primary side of an insulation transformer 308, and an input audio signal and a negative feedback signal are provided to the pulse modulator 304 through photo couplers 802 and 804, respectively. By doing so, insulation of the audio signal and the negative feedback signal is achieved.
  • FlG. 9 is a circuit diagram of a digital audio amplifier 300 according to still another embodiment of the present invention.
  • a pulse modulator 304 is disposed on the primary side of an insulation transformer 308, and an input audio signal and a negative feedback signal are provided to the pulse modulator 304 through photo couplers 802 and 804, respectively, as in the embodiment of FlG. 8.
  • FlG. 9 is different from that of FlG. 8 in that a comparator 304c is employed instead of the Schmitt trigger 304b.
  • PWM modulation units and switching units which are usually used in both the SMPS and the D class digital audio amplifier can be simplified such that the number of parts and components, manufacturing cost, and installation space can be reduced.
  • SMPS can be omitted, which improves power efficiency reduces the space required for heat radiation.
  • the present invention relates to a digital audio signal amplifier in which both safety and power efficiency are achieved by integrating a switching mode power supply and a digital audio amplifier into one body, and a digital audio signal amplifying method appropriate for the amplifier are provided.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
PCT/KR2006/004341 2005-10-24 2006-10-24 Digital audio amplifier and digital audio amplifying method therefor Ceased WO2007049898A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2008535471A JP5415765B2 (ja) 2005-10-24 2006-10-24 デジタルオーディオ信号増幅器及びこれに適したデジタルオーディオ信号増幅方法
CN200680036154XA CN101278477B (zh) 2005-10-24 2006-10-24 数字音频放大器及其数字音频放大方法
US12/090,278 US7952426B2 (en) 2005-10-24 2006-10-24 Digital audio amplifier and digital audio amplifying method therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0100402 2005-10-24
KR1020050100402A KR101128520B1 (ko) 2005-10-24 2005-10-24 디지털 오디오 증폭기 및 이에 적합한 디지털 오디오 신호증폭 방법

Publications (1)

Publication Number Publication Date
WO2007049898A1 true WO2007049898A1 (en) 2007-05-03

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PCT/KR2006/004341 Ceased WO2007049898A1 (en) 2005-10-24 2006-10-24 Digital audio amplifier and digital audio amplifying method therefor

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Country Link
US (1) US7952426B2 (https=)
JP (1) JP5415765B2 (https=)
KR (1) KR101128520B1 (https=)
CN (1) CN101278477B (https=)
WO (1) WO2007049898A1 (https=)

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WO2009094380A1 (en) * 2008-01-22 2009-07-30 Analog Devices, Inc. Signal amplifier
US9036835B2 (en) * 2007-11-05 2015-05-19 Aliphcom Combining an audio power amplifier and a power converter in a single device
US9293997B2 (en) 2013-03-14 2016-03-22 Analog Devices Global Isolated error amplifier for isolated power supplies
EP3101807A1 (de) * 2015-06-01 2016-12-07 Siemens Schweiz AG Verstärkerschaltung und verfahren zum betrieb einer verstärkerschaltung

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US8384478B2 (en) * 2010-03-04 2013-02-26 Bose Corporation Versatile audio power amplifier
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US8760230B2 (en) 2012-06-28 2014-06-24 Wen-Hsiung Hsieh Switching amplifier with pulsed current source and sink
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KR101619837B1 (ko) 2014-11-20 2016-05-11 서용상 디급 디지털 증폭기
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KR102156327B1 (ko) * 2020-05-21 2020-09-15 (주)아이엠피 단일권선 변압기와 스너버 캐패시터를 이용한 절연형 Class D 오디오 앰프
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CN112865722B (zh) * 2021-01-08 2022-06-14 四川湖山电器股份有限公司 一种数字功率放大器过流保护检测电路及数字功率放大器

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KR101128520B1 (ko) 2012-03-27
US20080252370A1 (en) 2008-10-16
JP2009512333A (ja) 2009-03-19
KR20070044283A (ko) 2007-04-27
US7952426B2 (en) 2011-05-31
CN101278477A (zh) 2008-10-01
JP5415765B2 (ja) 2014-02-12

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