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JPS56142465A - Excess current detecting method - Google Patents

Excess current detecting method

Info

Publication number
JPS56142465A
JPS56142465A JP4655280A JP4655280A JPS56142465A JP S56142465 A JPS56142465 A JP S56142465A JP 4655280 A JP4655280 A JP 4655280A JP 4655280 A JP4655280 A JP 4655280A JP S56142465 A JPS56142465 A JP S56142465A
Authority
JP
Japan
Prior art keywords
voltage
excess current
inductance
current detecting
resistance
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
JP4655280A
Other languages
Japanese (ja)
Inventor
Masahiro Yoshida
Masahiko Oka
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.)
Fuji Electric Co Ltd
Fuji Facom Corp
Original Assignee
Fuji Electric Co Ltd
Fuji Facom 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 Fuji Electric Co Ltd, Fuji Facom Corp filed Critical Fuji Electric Co Ltd
Priority to JP4655280A priority Critical patent/JPS56142465A/en
Publication of JPS56142465A publication Critical patent/JPS56142465A/en
Pending 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To make it possible to reduce an actual mounting space and the weight, by utilizing a resistance of a ripple-smoothening inductance as an excess current detecting resistance. CONSTITUTION:An AC input voltage Es is put into a transformer T through a commutation-smoothening unit 1, and a voltage which is excited on secondary side of the transformer T by switching of a switching transistor Tg is commuted and smoothed by a diode D1, an inductance L1 and a capacitor C1 to become an output voltage E0. On the other hand, a voltage which was generated on the both terminals of the inductance L1 by an output current 10 is put into an excess current detecting comparator 4 through a high-region breaking filters R2 and C2. When an excess current passes and a voltage drop by a resistance of the inductance L1 exceeded a reference voltage VR, a switching stop command 3 is sent out to a switching transistor control unit 2 to prevent a power source from the excees current. It is possible, by doing so, to reduce in size and power loss without using a large-type excess current detecting resistance of high heat generation.
JP4655280A 1980-04-09 1980-04-09 Excess current detecting method Pending JPS56142465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4655280A JPS56142465A (en) 1980-04-09 1980-04-09 Excess current detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4655280A JPS56142465A (en) 1980-04-09 1980-04-09 Excess current detecting method

Publications (1)

Publication Number Publication Date
JPS56142465A true JPS56142465A (en) 1981-11-06

Family

ID=12750475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4655280A Pending JPS56142465A (en) 1980-04-09 1980-04-09 Excess current detecting method

Country Status (1)

Country Link
JP (1) JPS56142465A (en)

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