JPS5595409A - Overcurrent detector of pulse-width-modulated signal amplifier circuit - Google Patents

Overcurrent detector of pulse-width-modulated signal amplifier circuit

Info

Publication number
JPS5595409A
JPS5595409A JP209779A JP209779A JPS5595409A JP S5595409 A JPS5595409 A JP S5595409A JP 209779 A JP209779 A JP 209779A JP 209779 A JP209779 A JP 209779A JP S5595409 A JPS5595409 A JP S5595409A
Authority
JP
Japan
Prior art keywords
pulse
width
modulated signal
signal amplifier
amplifier 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.)
Pending
Application number
JP209779A
Other languages
Japanese (ja)
Inventor
Tadao Yoshida
Tadao Suzuki
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP209779A priority Critical patent/JPS5595409A/en
Publication of JPS5595409A publication Critical patent/JPS5595409A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
    • 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

Landscapes

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

Abstract

PURPOSE:To prevent a switching element from breaking down without deteriorating switching characteristics, by providing a resistor for overcurrent detection in LPF. CONSTITUTION:A sound signal from input terminal 1 is supplied to load 14 by way of pulse-width modulation circuit 3, a pulse-width-modulated signal amplifier and LPF13. Here, resistor 15 for overecurrrnt detection is provided in LPF13. Further, transistors TR17 and TR18 are transistors for detecting forward and backward overcurrents. Now, since a current flowing through resistance 15 is below a prescribed value in an adequate load state, the input signal from terminal 1 is not limited at all. However, the current through resistance exceeds the prescribed value in an overload state, and consequently either of TR17 or TR18 turns ON while TR22 and FET23 also turn ON. Therefore, the input signal is never supplied to circuit 3. Thus, switching elements 11 and 12 can be prevented from breaking down without deteriorating switching characteristics.
JP209779A 1979-01-11 1979-01-11 Overcurrent detector of pulse-width-modulated signal amplifier circuit Pending JPS5595409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP209779A JPS5595409A (en) 1979-01-11 1979-01-11 Overcurrent detector of pulse-width-modulated signal amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP209779A JPS5595409A (en) 1979-01-11 1979-01-11 Overcurrent detector of pulse-width-modulated signal amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5595409A true JPS5595409A (en) 1980-07-19

Family

ID=11519838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP209779A Pending JPS5595409A (en) 1979-01-11 1979-01-11 Overcurrent detector of pulse-width-modulated signal amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5595409A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415863A (en) * 1981-03-24 1983-11-15 Pioneer Electronic Corporation Pulse width modulation amplifier
JP2008228157A (en) * 2007-03-15 2008-09-25 Toa Corp Power amplifier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081047A (en) * 1973-11-15 1975-07-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081047A (en) * 1973-11-15 1975-07-01

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415863A (en) * 1981-03-24 1983-11-15 Pioneer Electronic Corporation Pulse width modulation amplifier
JP2008228157A (en) * 2007-03-15 2008-09-25 Toa Corp Power amplifier

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