JPS5594165A - Transistor damage detetcor - Google Patents

Transistor damage detetcor

Info

Publication number
JPS5594165A
JPS5594165A JP69679A JP69679A JPS5594165A JP S5594165 A JPS5594165 A JP S5594165A JP 69679 A JP69679 A JP 69679A JP 69679 A JP69679 A JP 69679A JP S5594165 A JPS5594165 A JP S5594165A
Authority
JP
Japan
Prior art keywords
parallel
transistor
resistor
transistors
damage
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
JP69679A
Other languages
Japanese (ja)
Inventor
Moritaka Shoji
Tomohiko Shida
Juichiro Usuki
Katsuji Marumoto
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 JP69679A priority Critical patent/JPS5594165A/en
Publication of JPS5594165A publication Critical patent/JPS5594165A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE: To simplify the construction of a switching transistor damage detector by judging the damage of the switching transistors connected in parallel for balancing currents on the basis of induced voltage change generated at any emitter resistor of the switching transistors.
CONSTITUTION: A plurality of switching transistors 18,... are connected in parallel with a transistor switch 17 for balancing currents. The AC current amount to be supplied to a welder or the like is determined according to their selection. Any of LED 36W39 corresponding to the selected AC current amount irradiates a light by the induced voltage by the current flowing through the emitter resistor 19 of desired transistor 18 through a detecting circuit having arithmetic amplifiers 20W23 connected in parallel with the resistor 19. When the transistors 18 are damaged in this state, the increased induced voltage is detected via the resistor 19, and the LED 36W39 irradiate lights in response to the damaged transistors 18. Thus, the damage of the transistor can be detected with a simple construction that is connected not to the emitter resistors at every detecting circuit but in parallel to any emitter resistor.
COPYRIGHT: (C)1980,JPO&Japio
JP69679A 1979-01-10 1979-01-10 Transistor damage detetcor Pending JPS5594165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP69679A JPS5594165A (en) 1979-01-10 1979-01-10 Transistor damage detetcor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP69679A JPS5594165A (en) 1979-01-10 1979-01-10 Transistor damage detetcor

Publications (1)

Publication Number Publication Date
JPS5594165A true JPS5594165A (en) 1980-07-17

Family

ID=11480919

Family Applications (1)

Application Number Title Priority Date Filing Date
JP69679A Pending JPS5594165A (en) 1979-01-10 1979-01-10 Transistor damage detetcor

Country Status (1)

Country Link
JP (1) JPS5594165A (en)

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