JPS57196160A - Electronic watt-hour meter - Google Patents

Electronic watt-hour meter

Info

Publication number
JPS57196160A
JPS57196160A JP56083243A JP8324381A JPS57196160A JP S57196160 A JPS57196160 A JP S57196160A JP 56083243 A JP56083243 A JP 56083243A JP 8324381 A JP8324381 A JP 8324381A JP S57196160 A JPS57196160 A JP S57196160A
Authority
JP
Japan
Prior art keywords
polarity
current
voltage
width
pulse
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
JP56083243A
Other languages
Japanese (ja)
Inventor
Hajime Kaneda
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56083243A priority Critical patent/JPS57196160A/en
Publication of JPS57196160A publication Critical patent/JPS57196160A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To enable calculation of electric energy at a high accuracy with a simple circuitry by counting pulse trains of pulses whose width is proportional to the magnitude of voltage and current within the width thereof. CONSTITUTION:A voltage-pulse width converter 1 and a current-pulse width converter 2 generate pulses with a width proportional to voltage and current values synchronizing sample pulses S1 and S2. A polarity discrimination circuit 3 receives polarity signals indicating the polarity of individual signals and produces an output corresponding to the polarity of the current power 9 at each point of time. Then, a gate circuit 4 allows pulse train S0 to pass only during the period in which pulse trains of the voltage value V and those of the current value I both arrive. The pulse trains are added or subtracted with a up/down counter 5 according to the output of the polarity discrimination circuit 3 and the electric energy is indicated on a display 6. This eliminates complicated multipliers and adders providing a device inexpensive with a high accuracy.
JP56083243A 1981-05-28 1981-05-28 Electronic watt-hour meter Pending JPS57196160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083243A JPS57196160A (en) 1981-05-28 1981-05-28 Electronic watt-hour meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083243A JPS57196160A (en) 1981-05-28 1981-05-28 Electronic watt-hour meter

Publications (1)

Publication Number Publication Date
JPS57196160A true JPS57196160A (en) 1982-12-02

Family

ID=13796880

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083243A Pending JPS57196160A (en) 1981-05-28 1981-05-28 Electronic watt-hour meter

Country Status (1)

Country Link
JP (1) JPS57196160A (en)

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