JPS57131125A - Short-circuit protecting circuit of semiconductor switch - Google Patents

Short-circuit protecting circuit of semiconductor switch

Info

Publication number
JPS57131125A
JPS57131125A JP56015764A JP1576481A JPS57131125A JP S57131125 A JPS57131125 A JP S57131125A JP 56015764 A JP56015764 A JP 56015764A JP 1576481 A JP1576481 A JP 1576481A JP S57131125 A JPS57131125 A JP S57131125A
Authority
JP
Japan
Prior art keywords
transistor
circuit
turned
short
switching
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
JP56015764A
Other languages
Japanese (ja)
Other versions
JPS6111011B2 (en
Inventor
Masahiro Yoshida
Tetsuhito Watanabe
Hiroaki Nojiri
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.)
Fuji Electric Co Ltd
Fuji Facom Corp
Original Assignee
Fuji Electric Co Ltd
Fuji Facom Corp
Fuji Electric Manufacturing 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 Fuji Electric Co Ltd, Fuji Facom Corp, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP56015764A priority Critical patent/JPS57131125A/en
Publication of JPS57131125A publication Critical patent/JPS57131125A/en
Publication of JPS6111011B2 publication Critical patent/JPS6111011B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To protect a switching element without using an overcurrent detecting resistance, by delaying a switching signal, applying it to an overcurrent detecting circuit for detecting the voltage across the switching element, and cutting off the switching element by an output of this detecting circuit. CONSTITUTION:A switching signal of a switching signal generating circuit 1 is rectified and smoothed by a diode D1 and a capacitor C1 through a transformer T, is applied to a switching transistor TR1, and turns it on. A time constant of a delaying circuit consisting of a resistance R2 and a capacitor C2 is large and the transistor TR1 is turned on before a transistor TR2 is turned on, therefore, the transistor TR2 continues an off-state. When an overcurrent flows to the transistor TR1, the potential of a point P3 rises, accordingly the potential of a point P2 rises, the transistor TR2 is turned on, and a transistor TR3 is turned off.
JP56015764A 1981-02-06 1981-02-06 Short-circuit protecting circuit of semiconductor switch Granted JPS57131125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56015764A JPS57131125A (en) 1981-02-06 1981-02-06 Short-circuit protecting circuit of semiconductor switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56015764A JPS57131125A (en) 1981-02-06 1981-02-06 Short-circuit protecting circuit of semiconductor switch

Publications (2)

Publication Number Publication Date
JPS57131125A true JPS57131125A (en) 1982-08-13
JPS6111011B2 JPS6111011B2 (en) 1986-04-01

Family

ID=11897855

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56015764A Granted JPS57131125A (en) 1981-02-06 1981-02-06 Short-circuit protecting circuit of semiconductor switch

Country Status (1)

Country Link
JP (1) JPS57131125A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6885532B2 (en) 2001-08-13 2005-04-26 Yamaha Corporation Current detection and overcurrent protection for transistors in pulse-width modulation amplifier
WO2005096499A1 (en) * 2004-04-01 2005-10-13 Danfoss A/S An electronic switch
JP2008205662A (en) * 2007-02-19 2008-09-04 Onkyo Corp Switching amplifier
JP2015198368A (en) * 2014-04-01 2015-11-09 オンキヨー株式会社 overcurrent detection circuit and switching amplifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6885532B2 (en) 2001-08-13 2005-04-26 Yamaha Corporation Current detection and overcurrent protection for transistors in pulse-width modulation amplifier
WO2005096499A1 (en) * 2004-04-01 2005-10-13 Danfoss A/S An electronic switch
JP2008205662A (en) * 2007-02-19 2008-09-04 Onkyo Corp Switching amplifier
JP2015198368A (en) * 2014-04-01 2015-11-09 オンキヨー株式会社 overcurrent detection circuit and switching amplifier

Also Published As

Publication number Publication date
JPS6111011B2 (en) 1986-04-01

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