FR2401549A1 - Transistor audio amplifier output stage protection circuit - has capacitor in series with voltage divider sensing output voltage with junction connected via diode and resistor to inductive load - Google Patents

Transistor audio amplifier output stage protection circuit - has capacitor in series with voltage divider sensing output voltage with junction connected via diode and resistor to inductive load

Info

Publication number
FR2401549A1
FR2401549A1 FR7816715A FR7816715A FR2401549A1 FR 2401549 A1 FR2401549 A1 FR 2401549A1 FR 7816715 A FR7816715 A FR 7816715A FR 7816715 A FR7816715 A FR 7816715A FR 2401549 A1 FR2401549 A1 FR 2401549A1
Authority
FR
France
Prior art keywords
connected via
resistor
capacitor
series
protection 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.)
Granted
Application number
FR7816715A
Other languages
French (fr)
Other versions
FR2401549B3 (en
Inventor
Gerhard Schwarz
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.)
Braun GmbH
Original Assignee
Braun GmbH
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 Braun GmbH filed Critical Braun GmbH
Publication of FR2401549A1 publication Critical patent/FR2401549A1/en
Application granted granted Critical
Publication of FR2401549B3 publication Critical patent/FR2401549B3/fr
Granted 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

Landscapes

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

Abstract

The Af transistor circuit comprises a pair of complementary output transistor (2, 3) connected in push-pull with their emitters connected via resistors (4, 5) to a load (6). To provide overload protection two further transistors (7, 8) are connected to their respective output transistors via resistors (9, 10) which together with other resistors (11, 12) form a potential divider. The end of each divider is earthed via a capacitor (13, 14). A diode (15, 16) is connected via a resistor to the load. The DC voltages appearing on the capacitors determine the working point on the Ic-Uce characteristic of the output transistors. In the event of short circuited load, the working point is shifted according to the time constants. The circuit is esp. suitable for use with inductive loads, e.g. loudspeakers.
FR7816715A 1977-08-23 1978-06-05 Transistor audio amplifier output stage protection circuit - has capacitor in series with voltage divider sensing output voltage with junction connected via diode and resistor to inductive load Granted FR2401549A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772737860 DE2737860B1 (en) 1977-08-23 1977-08-23 Transistor amplifier stage protected against overload

Publications (2)

Publication Number Publication Date
FR2401549A1 true FR2401549A1 (en) 1979-03-23
FR2401549B3 FR2401549B3 (en) 1981-01-23

Family

ID=6017040

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7816715A Granted FR2401549A1 (en) 1977-08-23 1978-06-05 Transistor audio amplifier output stage protection circuit - has capacitor in series with voltage divider sensing output voltage with junction connected via diode and resistor to inductive load

Country Status (2)

Country Link
DE (1) DE2737860B1 (en)
FR (1) FR2401549A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3116846A1 (en) * 1981-04-28 1982-12-09 Siemens AG, 1000 Berlin und 8000 München Arrangement for protecting a power transistor, which is operating as an amplifier, against overloading
DE3431676A1 (en) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart INTEGRATED POWER AMPLIFIER

Also Published As

Publication number Publication date
FR2401549B3 (en) 1981-01-23
DE2737860B1 (en) 1979-01-11

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Legal Events

Date Code Title Description
ST Notification of lapse