Switched-capacitor watthour meter circuit having reduced capacitor ratio

Abstract From the Canadian patent

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 proportional, 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 …