JPS63234165A - Current detecting circuit - Google Patents

Current detecting circuit

Info

Publication number
JPS63234165A
JPS63234165A JP6940987A JP6940987A JPS63234165A JP S63234165 A JPS63234165 A JP S63234165A JP 6940987 A JP6940987 A JP 6940987A JP 6940987 A JP6940987 A JP 6940987A JP S63234165 A JPS63234165 A JP S63234165A
Authority
JP
Japan
Prior art keywords
current
emitter
voltage
detecting circuit
resistor
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
JP6940987A
Other languages
Japanese (ja)
Inventor
Kazuhide Deguchi
Tetsuo Kobayashi
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6940987A priority Critical patent/JPS63234165A/en
Publication of JPS63234165A publication Critical patent/JPS63234165A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To measure a large current by allowing a high-impedance voltage detecting circuit to detect a voltage which is developed by a current to be measured flowing to a diffusion resistor formed in the emitter area of a transistor (TR) whose base area is a terminal for the current to be measured.
CONSTITUTION: The voltage detecting circuit 3a which has high input impedance is connected to the power TR 1 which has an emitter balanced resistor rE. Then when a current flows between the base and emitter of the TR 1, the voltage proportional to the quantity of the current is developed between the emitter and collector, but the input terminal impedance of the circuit 3a is infinite, so almost no current flows between the emitter and collector. The base-emitter current is calculated from the voltage detected by the circuit 3a and the resistance value of the resistor rE, so a large current can be detected without using any large detection resistor.
COPYRIGHT: (C)1988,JPO&Japio
JP6940987A 1987-03-23 1987-03-23 Current detecting circuit Pending JPS63234165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6940987A JPS63234165A (en) 1987-03-23 1987-03-23 Current detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6940987A JPS63234165A (en) 1987-03-23 1987-03-23 Current detecting circuit

Publications (1)

Publication Number Publication Date
JPS63234165A true JPS63234165A (en) 1988-09-29

Family

ID=13401778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6940987A Pending JPS63234165A (en) 1987-03-23 1987-03-23 Current detecting circuit

Country Status (1)

Country Link
JP (1) JPS63234165A (en)

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