Patent ID: 7747399
Filing Date: 2010-06-29
Classification: G01D,G01R,Y02B,Y04S

Abstract:
1. A system for monitoring electricity consumption, comprising: a transmitter for wirelessly transmitting electricity consumption data, comprising an electricity consumption detection circuit and a wireless data transmission device; at least one display device adapted to receive electricity consumption data wirelessly from the transmitter; wherein the electricity consumption detection circuit comprises a diode bridge and a difference amplifier connected to a microprocessor; and wherein the diode bridge is coupled to an electrical power circuit of a building and converts alternating current to direct current having a voltage value corresponding to a voltage of the electrical power circuit; the microprocessor samples the voltage value of the direct current from the diode bridge at selected intervals and stores the sampled voltage value as a stored value; the difference amplifier receives the direct current at a first terminal and receives a stored value from the microprocessor at a second terminal; and the difference amplifier compares the voltage value of the direct current to the stored value and outputs a difference signal to the microprocessor, wherein the difference signal corresponds to the voltage difference between the voltage value of the direct current and the stored value.