JPS57118439A - Short circuit protecting circuit of transistor - Google Patents

Short circuit protecting circuit of transistor

Info

Publication number
JPS57118439A
JPS57118439A JP56003187A JP318781A JPS57118439A JP S57118439 A JPS57118439 A JP S57118439A JP 56003187 A JP56003187 A JP 56003187A JP 318781 A JP318781 A JP 318781A JP S57118439 A JPS57118439 A JP S57118439A
Authority
JP
Japan
Prior art keywords
current
transistor
short circuit
circuit
increases
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
JP56003187A
Other languages
Japanese (ja)
Inventor
Akira Ozaka
Tsuneo Ichiishi
Mikio Yoda
Yasushi Shinohara
Fumio Ishiyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56003187A priority Critical patent/JPS57118439A/en
Publication of JPS57118439A publication Critical patent/JPS57118439A/en
Pending 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 realize a short circuit preventing circuit of a transistor which prevent the transistor from the breakdown due to a short circuit, by connecting a resistor for detection of current in series to a load and turning on a protecting transistor with the voltage at the both ends of the resistor. CONSTITUTION:When a short circuit occures across a load 1, the current flowing through a resistance 14 increases. When this current exceeds the Zener voltage of a Zener diode 17, the base current flows to a transistor (TR)15. As a result, a large current is poured to the base of a TR5 through a resistance 18. This increases the collector current of a TR4. At the same time, the base current increases more than the short circuit current. As a result, the TR4 keeps the saturated state even after the occurrence of a short circuit to reduce the loss caused within the TR4. Meanswhile a fuse 13 is fused to prevent the breakdown of the TR4.
JP56003187A 1981-01-14 1981-01-14 Short circuit protecting circuit of transistor Pending JPS57118439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56003187A JPS57118439A (en) 1981-01-14 1981-01-14 Short circuit protecting circuit of transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56003187A JPS57118439A (en) 1981-01-14 1981-01-14 Short circuit protecting circuit of transistor

Publications (1)

Publication Number Publication Date
JPS57118439A true JPS57118439A (en) 1982-07-23

Family

ID=11550392

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56003187A Pending JPS57118439A (en) 1981-01-14 1981-01-14 Short circuit protecting circuit of transistor

Country Status (1)

Country Link
JP (1) JPS57118439A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833449A1 (en) * 1996-09-30 1998-04-01 Siemens Aktiengesellschaft Power output stage for switching an inductive load

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833449A1 (en) * 1996-09-30 1998-04-01 Siemens Aktiengesellschaft Power output stage for switching an inductive load

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