Electric power calculation system
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United States of America Patent
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-
Dec 17, 2002
Grant Date -
N/A
app pub date -
Mar 3, 2000
filing date -
Mar 5, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A voltage (V1) and a current (A1), input from input terminals (T1) and (T2), are A/D converted to 1-bit output data by delta modulators and 1-bit output data of the delta modulator is delayed, using a phase-shifting circuit implemented by either a RAM (semiconductor memory) or shift registers, by an amount equivalent to 90.degree. of the input voltage (V1), before a subsequent circuit performs a calculation of a reactive power. This circuit configuration reduces analog circuitry and enables a compact, low-cost implementation, even for use in an LSI.
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