JPS55153406A - Switching amplifier - Google Patents

Switching amplifier

Info

Publication number
JPS55153406A
JPS55153406A JP6180479A JP6180479A JPS55153406A JP S55153406 A JPS55153406 A JP S55153406A JP 6180479 A JP6180479 A JP 6180479A JP 6180479 A JP6180479 A JP 6180479A JP S55153406 A JPS55153406 A JP S55153406A
Authority
JP
Japan
Prior art keywords
waveform
pulse
input
phase
width
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.)
Pending
Application number
JP6180479A
Other languages
Japanese (ja)
Inventor
Shinya Sano
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6180479A priority Critical patent/JPS55153406A/en
Publication of JPS55153406A publication Critical patent/JPS55153406A/en
Pending legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To increase the efficiency of switching amplifier and the performance, by forming the circuit through the use of two pulse width modulation amplifiers. CONSTITUTION:The voltage having the waveform (a) from the input terminal 1 is pulse-width-modulated with the output of the triangle wave generator 3 at the comparator 4 to obtain the waveform (d). Further, the inptut waveform (a) is inverted at the phase inverter 2 and pulse-width-modulated at the comparator 5 similarly to obtain the waveform (e). Next, the waveform (f) subtracting the waveforms (d) and (e) is fed to the speaker load 6. Since the speaker 6 is not responded to the high frequency pulse, the audio waveform (g) similar to the input waveform (a) is obtained. The phase of the output pulse of the comparators 4, 5 is in-phase and no current flows to the comparators 4, 5 or load 6 when the input is zero especially. Thus, the efficiency at small signal input can remarkably be increased. Further, the high frequency noise at no input can be reduced.
JP6180479A 1979-05-18 1979-05-18 Switching amplifier Pending JPS55153406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6180479A JPS55153406A (en) 1979-05-18 1979-05-18 Switching amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6180479A JPS55153406A (en) 1979-05-18 1979-05-18 Switching amplifier

Publications (1)

Publication Number Publication Date
JPS55153406A true JPS55153406A (en) 1980-11-29

Family

ID=13181636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6180479A Pending JPS55153406A (en) 1979-05-18 1979-05-18 Switching amplifier

Country Status (1)

Country Link
JP (1) JPS55153406A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646031A1 (en) * 1989-04-13 1990-10-19 Beltone Electronics Corp HIGH PERFORMANCE SWITCHING AMPLIFIER, IN PARTICULAR FOR AUDITIVE PROSTHESIS, AND METHOD FOR TREATING ACOUSTIC WAVEFORM USING SUCH AMPLIFIER
GB2431531A (en) * 2005-10-17 2007-04-25 Harman Int Ind Triangle waveform generator for a PWM amplifier

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646031A1 (en) * 1989-04-13 1990-10-19 Beltone Electronics Corp HIGH PERFORMANCE SWITCHING AMPLIFIER, IN PARTICULAR FOR AUDITIVE PROSTHESIS, AND METHOD FOR TREATING ACOUSTIC WAVEFORM USING SUCH AMPLIFIER
GB2431531A (en) * 2005-10-17 2007-04-25 Harman Int Ind Triangle waveform generator for a PWM amplifier
US7557622B2 (en) 2005-10-17 2009-07-07 Harman International Industries, Incorporated Precision triangle waveform generator
GB2431531B (en) * 2005-10-17 2010-09-01 Harman Int Ind Precision triangle waveform generator
JP2011061839A (en) * 2005-10-17 2011-03-24 Harman Internatl Industries Inc Precision triangular wave generator
US7919998B2 (en) 2005-10-17 2011-04-05 Harman International Industries, Incorporated Precision triangle waveform generator

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