System and method for measuring active power in a load without a load voltage
AssigneeEurotherm Limited
InventorsLoris Morassutto, Joe Cottam, Gerard Ledee
Life of this patent
Estimating the term…
Abstract
A system for use in determining the active power used in an electrical circuit is provided. The system includes an electrical circuit comprising both reactive and resistive components, and a digital processor connected to the electrical circuit, the digital processor configured to collect synchronized samples of a line voltage across the electrical circuit and a load current through the electrical circuit. The digital processor processes the synchronized samples of the line voltage and the load current to determine an active power used in the electrical circuit.
Claims21
A system for use in determining the active power used in an electrical circuit, comprising:
- an electrical circuit comprising both reactive and resistive components;
- a digital processor connected to the electrical circuit, the digital processor configured to collect synchronized samples of a line voltage across the electrical circuit and a load current through the electrical circuit;
- wherein the digital processor processes the synchronized samples of the line voltage and the load current to determine an active power used in the electrical circuit without sampling a load voltage.
A method for determining the active power used in an electrical circuit, the method comprising:
- sampling the load current through the electrical circuit;
- sampling the line voltage across the electrical circuit;
- and
- digitally processing the samples of the line voltage and the load current to determine an active power used in the electrical circuit without sampling a load voltage.
A digital processor device, comprising:
- an input circuit for gathering samples of a line voltage across an electrical circuit and samples of a load current through the electrical circuit;
- a memory device connected to the input circuit that stores gathered sample values and contains instructions for processing the gathered sample values;
- and
- a processing circuit connected to the memory device that executes the instructions using the stored sample values to determine the active power used in the electrical circuit without sampling a load voltage.
Dependencies are inferred from the claim text.