JPS5561827A - Protection circuit for power supply - Google Patents

Protection circuit for power supply

Info

Publication number
JPS5561827A
JPS5561827A JP13433878A JP13433878A JPS5561827A JP S5561827 A JPS5561827 A JP S5561827A JP 13433878 A JP13433878 A JP 13433878A JP 13433878 A JP13433878 A JP 13433878A JP S5561827 A JPS5561827 A JP S5561827A
Authority
JP
Japan
Prior art keywords
transistor
short circuit
power supply
cut
potential
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
JP13433878A
Other languages
Japanese (ja)
Inventor
Shinichi Otsu
Noboru Furukawa
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 JP13433878A priority Critical patent/JPS5561827A/en
Publication of JPS5561827A publication Critical patent/JPS5561827A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To prevent the destruction of power supply unit, by cutting off the output transistor with the short circuit detection transistor, if the load of the constant current power supply unit is in short circuit.
CONSTITUTION: When the voltage is inputted from the input terminal 9 and 9', the base terminal of the control transistor 4 is kept a given potential with the Zener diode 1 to constitute the constant current source, and the Zener diode 2 is connected to the base of the output transistor 5 to constitute the constant voltage source. The base of the short circuit detection transistor 6 is clamped at a given voltage with the Zener diode 3 normally and it is cut off since the emitter has greater potential. But if the load is in short circuit, the emitter potential is increased to cause the transistor 6 ON, and the transistor 4 is cut off with the increased emitter potential and the output transistor 6 is also cut off.
COPYRIGHT: (C)1980,JPO&Japio
JP13433878A 1978-10-31 1978-10-31 Protection circuit for power supply Pending JPS5561827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13433878A JPS5561827A (en) 1978-10-31 1978-10-31 Protection circuit for power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13433878A JPS5561827A (en) 1978-10-31 1978-10-31 Protection circuit for power supply

Publications (1)

Publication Number Publication Date
JPS5561827A true JPS5561827A (en) 1980-05-09

Family

ID=15126007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13433878A Pending JPS5561827A (en) 1978-10-31 1978-10-31 Protection circuit for power supply

Country Status (1)

Country Link
JP (1) JPS5561827A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5179246A (en) * 1975-01-06 1976-07-10 Hitachi Ltd TEIDENATSUKAIRONOHOGOKAIRO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5179246A (en) * 1975-01-06 1976-07-10 Hitachi Ltd TEIDENATSUKAIRONOHOGOKAIRO

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