JPS57182657A - Current detecting circuit - Google Patents

Current detecting circuit

Info

Publication number
JPS57182657A
JPS57182657A JP56067836A JP6783681A JPS57182657A JP S57182657 A JPS57182657 A JP S57182657A JP 56067836 A JP56067836 A JP 56067836A JP 6783681 A JP6783681 A JP 6783681A JP S57182657 A JPS57182657 A JP S57182657A
Authority
JP
Japan
Prior art keywords
current
terminal
voltage
transformer
diode
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
JP56067836A
Other languages
Japanese (ja)
Other versions
JPH0442630B2 (en
Inventor
Katsuhiko Inaba
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56067836A priority Critical patent/JPS57182657A/en
Publication of JPS57182657A publication Critical patent/JPS57182657A/en
Publication of JPH0442630B2 publication Critical patent/JPH0442630B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc

Abstract

PURPOSE:To make a current transformer small-sized, by fetching a voltage pulse which is exactly proportional to a current value of a current pulse, when a duty circuit whose off-time is below constant is opened and closed, and two-way current pulses flowing in two directions alternately only at its off-time exist in this circuit. CONSTITUTION:To one terminal (c) of a secondary winding in a current transformer 1 consisting of a primary side winding and a secondary side winding having a terminal (d) of a middle point, the anode of a diode 2 is connected, and to the other terminal (e), the anode of a diode 3 is connected. Between the connecting point of the respective cathodes of these diodes 2, 3, and the terminal (d), a series circuit consisting of a switch 6 and a resistance 4 is connected, and also a constant voltage diode 5 is connected in parallel with this series circuit. It is possible to always obtain voltage which is exactly proportional to a current value of a two-way current pulse, by opening the switch during the suitable period in which a current pulse finishes its flowing in some direction of the primary side of a transformer 1 and a current pulse in the direction being opposite to said current pulse starts its flowing, and annihilating an energizing current generated in the transformer by making it flow to a constant-voltage diode 5 of proper voltage.
JP56067836A 1981-05-06 1981-05-06 Current detecting circuit Granted JPS57182657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067836A JPS57182657A (en) 1981-05-06 1981-05-06 Current detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067836A JPS57182657A (en) 1981-05-06 1981-05-06 Current detecting circuit

Publications (2)

Publication Number Publication Date
JPS57182657A true JPS57182657A (en) 1982-11-10
JPH0442630B2 JPH0442630B2 (en) 1992-07-14

Family

ID=13356423

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067836A Granted JPS57182657A (en) 1981-05-06 1981-05-06 Current detecting circuit

Country Status (1)

Country Link
JP (1) JPS57182657A (en)

Also Published As

Publication number Publication date
JPH0442630B2 (en) 1992-07-14

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