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JPS56125963A - Overload detector - Google Patents

Overload detector

Info

Publication number
JPS56125963A
JPS56125963A JP2844780A JP2844780A JPS56125963A JP S56125963 A JPS56125963 A JP S56125963A JP 2844780 A JP2844780 A JP 2844780A JP 2844780 A JP2844780 A JP 2844780A JP S56125963 A JPS56125963 A JP S56125963A
Authority
JP
Japan
Prior art keywords
overload
frequency
power converter
inputted
signal
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
JP2844780A
Other languages
Japanese (ja)
Other versions
JPS6042703B2 (en
Inventor
Teruo Nakano
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55028447A priority Critical patent/JPS6042703B2/en
Publication of JPS56125963A publication Critical patent/JPS56125963A/en
Publication of JPS6042703B2 publication Critical patent/JPS6042703B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
    • H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
    • H02M5/22—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/27—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)
  • Control Of Ac Motors In General (AREA)
  • Ac-Ac Conversion (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To enable the actual overload detection in the range of whole frequency and secure the protection by a method wherein the frequency element of a power converter is inputted to the overload detecting circuit, and the detecting point of overload is made variable in accordance with the frequency. CONSTITUTION:A current from a static power converter feeding vairable frequency AC power is inputted to an operational amplifier IC1 via a current transformer CT, a rectifier RF. In accordance with an allowable overload characteristic of the power converter, the detecting time is made longer when overload is small and shorter when overload is large, and a transistor TRS1 is made to operate to obtain a detecting signal. At this case, the frequency signal SP of the power converter is inputted to an operational amplifier IC2, and when the signal SP becomes samller than the lowest frequency signal being set by a variable resistor 4RH, output of the amplifier IC2 is made negative to bring down an operating point being set by a variable resistor 1RH through a diode D2, and a resistor R9. Accordingly overload can be surely detected in the range of whole frequency enabling the protection.
JP55028447A 1980-03-06 1980-03-06 Overload detection device Expired JPS6042703B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55028447A JPS6042703B2 (en) 1980-03-06 1980-03-06 Overload detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55028447A JPS6042703B2 (en) 1980-03-06 1980-03-06 Overload detection device

Publications (2)

Publication Number Publication Date
JPS56125963A true JPS56125963A (en) 1981-10-02
JPS6042703B2 JPS6042703B2 (en) 1985-09-24

Family

ID=12248919

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55028447A Expired JPS6042703B2 (en) 1980-03-06 1980-03-06 Overload detection device

Country Status (1)

Country Link
JP (1) JPS6042703B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980194A (en) * 1982-10-27 1984-05-09 Fuji Electric Co Ltd Overcurrent and overload protection method for induction motors
JPS60121918A (en) * 1983-12-05 1985-06-29 三菱電機株式会社 Protecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980194A (en) * 1982-10-27 1984-05-09 Fuji Electric Co Ltd Overcurrent and overload protection method for induction motors
JPS60121918A (en) * 1983-12-05 1985-06-29 三菱電機株式会社 Protecting device

Also Published As

Publication number Publication date
JPS6042703B2 (en) 1985-09-24

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