IT1054290B - Excess current detection circuit - uses nonlinear magnetic coupling via saturated core with hysteresis - Google Patents

Excess current detection circuit - uses nonlinear magnetic coupling via saturated core with hysteresis

Info

Publication number
IT1054290B
IT1054290B IT1944576A IT1944576A IT1054290B IT 1054290 B IT1054290 B IT 1054290B IT 1944576 A IT1944576 A IT 1944576A IT 1944576 A IT1944576 A IT 1944576A IT 1054290 B IT1054290 B IT 1054290B
Authority
IT
Italy
Prior art keywords
hysteresis
core
load
current
nonlinear magnetic
Prior art date
Application number
IT1944576A
Other languages
Italian (it)
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
Application granted granted Critical
Publication of IT1054290B publication Critical patent/IT1054290B/en

Links

Landscapes

  • Motor And Converter Starters (AREA)
  • Electric Vacuum Cleaner (AREA)
  • Joints Allowing Movement (AREA)

Abstract

A circuit for detecting excess load a.c. and various developed forms of it for motor starting circuits and the like, using the nonlinear magnetic characteristic of a core with hysteresis, is presented. The basic circuit consists of a current transformer with a primary winding (5) through which the alternating load current (9) flows, a secondary winding (6) through which a direct bias current (IB) flows, and a core (3) with a square loop hysteresis characteristic. The bias current in the secondary has such a magnitude that the core provides no effective coupling between the windings unless the load alternating current exceeds the required threshold. In this case pulses are produced in the secondary winding coincident with teh peak values of the load currents.
IT1944576A 1975-01-20 1976-01-21 Excess current detection circuit - uses nonlinear magnetic coupling via saturated core with hysteresis IT1054290B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP971675U JPS5190648U (en) 1975-01-20 1975-01-20

Publications (1)

Publication Number Publication Date
IT1054290B true IT1054290B (en) 1981-11-10

Family

ID=28079867

Family Applications (1)

Application Number Title Priority Date Filing Date
IT1944576A IT1054290B (en) 1975-01-20 1976-01-21 Excess current detection circuit - uses nonlinear magnetic coupling via saturated core with hysteresis

Country Status (2)

Country Link
JP (1) JPS5190648U (en)
IT (1) IT1054290B (en)

Also Published As

Publication number Publication date
JPS5190648U (en) 1976-07-20

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