ELECTRONIC WATTHOUR METER - Mitsubishi Electric Corporation

Title:

ELECTRONIC WATTHOUR METER

Document Type and Number:

Japanese Patent JP3248860

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To obtain a high accuracy watthour meter by subjecting the output voltage especially from a Hall element to temperature compensation when Hall element is utilized as a multiplier and eliminating the effect of external field.
SOLUTION: The watthour meter comprises a voltage-current converting means 9 comprising a voltage converter 14 and a voltage-current converting circuit 5, and a multiplying means 10 comprising a Hall element 7 and a differential amplifier circuit 16. The voltage between the input end H1 and the output end H4 of the Hall element 7 is converted through the differential amplifier circuit 16 and a resistor 15 into a current of same polarity as the input current to the Hall element 7 and then it is inputted to the Hall element 7. Input current to the Hall element 7 is imparted with a temperature coefficient in order to cancel the temperature coefficient of output voltage from the Hall element 7.

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Inventors:

Keishu Kondo
Satoru Inoue

Application Number:

JP17830697A

Publication Date:

January 21, 2002

Filing Date:

July 03, 1997

Export Citation:

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Assignee:

Mitsubishi Electric Corporation

International Classes:

G01R22/00; G01R21/08; G06G7/162; (IPC1-7): G01R21/08; G01R22/00; G06G7/162

Domestic Patent References:

JP735788A
JP7218563A

Attorney, Agent or Firm:

Soga Doteru (6 people outside)

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