JPS56162120A - Controlling circuit for power factor improvement - Google Patents

Controlling circuit for power factor improvement

Info

Publication number
JPS56162120A
JPS56162120A JP6390980A JP6390980A JPS56162120A JP S56162120 A JPS56162120 A JP S56162120A JP 6390980 A JP6390980 A JP 6390980A JP 6390980 A JP6390980 A JP 6390980A JP S56162120 A JPS56162120 A JP S56162120A
Authority
JP
Japan
Prior art keywords
power factor
current intermittent
commerical
value
electric power
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
JP6390980A
Other languages
Japanese (ja)
Inventor
Fumio Tajima
Tsunehiro Endo
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.)
Hitachi Ltd
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
Priority to JP6390980A priority Critical patent/JPS56162120A/en
Publication of JPS56162120A publication Critical patent/JPS56162120A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/70—Regulating power factor; Regulating reactive current or power

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Rectifiers (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To improve the power factor efficiently, by stopping a current intermittent operation when an instantaneous value of supply voltage is smaller than a reference value, and executing the current intermittent operation when said instantaneous value is larger than the reference value. CONSTITUTION:Oscillator outputs of capacity feedback type oscillators 7, 20 having the same frequency as a commerical electric power supply 1 and a capacity feedback type oscillator 8 having more oscillation frequency than the commercial electric power supply 1 are compared with a set level by comparators 9, 10, 21 and control the base of a current intermittent element 5a through an AND circuit 11. Accordingly, a base driving pulse of a transistor in case when commerical supply voltage is below a constant value is removed by an output waveform of the comparator 21, and a chopping loss is greatly improved.
JP6390980A 1980-05-16 1980-05-16 Controlling circuit for power factor improvement Pending JPS56162120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6390980A JPS56162120A (en) 1980-05-16 1980-05-16 Controlling circuit for power factor improvement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6390980A JPS56162120A (en) 1980-05-16 1980-05-16 Controlling circuit for power factor improvement

Publications (1)

Publication Number Publication Date
JPS56162120A true JPS56162120A (en) 1981-12-12

Family

ID=13242923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6390980A Pending JPS56162120A (en) 1980-05-16 1980-05-16 Controlling circuit for power factor improvement

Country Status (1)

Country Link
JP (1) JPS56162120A (en)

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