G - Physics – 01 – R
Patent
G - Physics
01
R
356/23, 324/70
G01R 21/127 (2006.01) G01R 21/133 (2006.01)
Patent
CA 1283451
SWITCHED-CAPACITOR WATTHOUR METER CIRCUIT HAVING REDUCED CAPACITOR RATIO Abstract of the Disclosure An electronic energy consumption measuring circuit capable of being fabricated on a single integrated circuit chip employs a switched-capacitor integrator for integrating the product of first and second voltages which are propor- tional, respectively, to load voltage and current in an electrical system to provide a measure of the energy being consumed, and a hysteresis comparator for converting the integrator output into a pulse train wherein each pulse represents a predetermined amount of energy. The output pulses may be accumulated and displayed to provide an indication of total energy consumed. A divider at the hysteresis comparator output enables the capacitor ratio in the switched-capacitor integrator to be reduced substan- tially so that the capacitor values are approximately the same order of magnitude. This reduces the chip area neces- sary for fabricating the capacitors and improves the matching between the capacitors, thereby affording higher integration accuracy.
559190
Company General Electric
Milkovic Miran
Oldham And Wilson
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