JPS5717226A - Integrated circuit - Google Patents

Integrated circuit

Info

Publication number
JPS5717226A
JPS5717226A JP9246780A JP9246780A JPS5717226A JP S5717226 A JPS5717226 A JP S5717226A JP 9246780 A JP9246780 A JP 9246780A JP 9246780 A JP9246780 A JP 9246780A JP S5717226 A JPS5717226 A JP S5717226A
Authority
JP
Japan
Prior art keywords
base current
overvoltage
trq4
trq3
turned
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
JP9246780A
Other languages
Japanese (ja)
Other versions
JPS6040219B2 (en
Inventor
Chikara Tsuchiya
Masaharu Atsumi
Yoshiaki 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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55092467A priority Critical patent/JPS6040219B2/ja
Publication of JPS5717226A publication Critical patent/JPS5717226A/en
Publication of JPS6040219B2 publication Critical patent/JPS6040219B2/ja
Expired 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

Abstract

PURPOSE:To achive the protection against overvoltage surely without being interferred with an overload protection function, by controlling the base current of a transistor(TR) provided in parallel with a TR receiving an input signal at an overvoltage detecting circuit. CONSTITUTION:An power supply Vcc is excessive due to surge, then an overvoltage detection circuit 20 is operated, a base current flows to a TRQ4 to be turned on and to turn on a TRQ3by flowing a base current. Thus, the collector potential of the collector potential of the TRQ3 goes down and the overvoltage is absorbed with a load RL. In this case, a greater load current flows to operate an overload detection circuit 10, a TRQ2 is turned off and the supply of base current to the TRQ3 is stopped. But, the base current is supplied from the TRQ4 and then no hindrance is given. On the other hand, when the power supply Vcc is normal, the TRQ4 is turned off and the base current of the TRQ3 is controlled with the TRQ2.
JP55092467A 1980-07-07 1980-07-07 Expired JPS6040219B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55092467A JPS6040219B2 (en) 1980-07-07 1980-07-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55092467A JPS6040219B2 (en) 1980-07-07 1980-07-07

Publications (2)

Publication Number Publication Date
JPS5717226A true JPS5717226A (en) 1982-01-28
JPS6040219B2 JPS6040219B2 (en) 1985-09-10

Family

ID=14055140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55092467A Expired JPS6040219B2 (en) 1980-07-07 1980-07-07

Country Status (1)

Country Link
JP (1) JPS6040219B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530390A1 (en) * 1982-07-17 1984-01-20 Bosch Gmbh Robert DARLINGTON MOUNTING OF TRANSISTORS
JPS59216324A (en) * 1983-05-24 1984-12-06 Fuji Electric Co Ltd Overcurrent protecting system of transistor
JPS6093962A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093964A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093961A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093963A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6097280A (en) * 1983-10-31 1985-05-31 Yamatake Honeywell Co Ltd Overcurrent detecting circuit of electronic switch
JPH05240433A (en) * 1992-02-27 1993-09-17 Hanshin Electric Co Ltd Load control circuit for hot water feeder
EP0680147A2 (en) * 1994-04-28 1995-11-02 Mitsubishi Denki Kabushiki Kaisha Semiconductor power module and power conversion device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530390A1 (en) * 1982-07-17 1984-01-20 Bosch Gmbh Robert DARLINGTON MOUNTING OF TRANSISTORS
JPS59216324A (en) * 1983-05-24 1984-12-06 Fuji Electric Co Ltd Overcurrent protecting system of transistor
JPS6093962A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093964A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093961A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6093963A (en) * 1983-10-28 1985-05-25 Yamatake Honeywell Co Ltd Over current detecting circuit of electronic switch
JPS6097280A (en) * 1983-10-31 1985-05-31 Yamatake Honeywell Co Ltd Overcurrent detecting circuit of electronic switch
JPH05240433A (en) * 1992-02-27 1993-09-17 Hanshin Electric Co Ltd Load control circuit for hot water feeder
EP0680147A2 (en) * 1994-04-28 1995-11-02 Mitsubishi Denki Kabushiki Kaisha Semiconductor power module and power conversion device
EP0680147B1 (en) * 1994-04-28 1999-03-31 Mitsubishi Denki Kabushiki Kaisha Semiconductor power module and power conversion device

Also Published As

Publication number Publication date
JPS6040219B2 (en) 1985-09-10

Similar Documents

Publication Publication Date Title
JPS5717226A (en) Integrated circuit
JPH02179219A (en) Power supply device
JPS60142411A (en) Constant voltage power supply circuit
JPS5794819A (en) Current control system of constant voltage circuit
JPS59161714A (en) Overcurrent protecting circuit
JPS63105518A (en) Semiconductor integrated circuit
JPS5448030A (en) Vercurrent protection circuit for swtching regulator
JPH0363782A (en) Ic card protector
JPS61189168A (en) Power source circuit
JPS6121604A (en) Overload detecting circuit
JPS59110379A (en) Controller for air conditioner
JPH04101664A (en) Multi-output switching regulator
JPH0362107A (en) Power unit with overload detecting function
JPS62142344A (en) Protecting device
JPS57188134A (en) Ac two-wire type contactless switch
JPS5340845A (en) Protective circuit for short-circuit
JPS60237707A (en) Overcurrent protecting circuit of transistor
JPS5831606A (en) Protection circuit for power amplifying circuit
JPS60201600A (en) Mos type semiconductor integrated circuit
JPS59106012A (en) Constant voltage circuit
JPS54139043A (en) Protective circuit for power output circuit
JPH04322505A (en) Protection circuit
JPH04114216A (en) Series regulator circuit
JPH03276077A (en) Power source protecting circuit
JPS56143589A (en) Semiconductor memory device