Single phase bi-directional electrical measurement systems and methods using ADCs

US6417792B1 · kind B1 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• Eric T. King · San Jose, US
• Douglas F. Pastorello · Hudson, US
• Bruce P. Del Signore · Hollis, US
• Victor Aguilar · Waterloo, BE
• Frank den Breejen · Austin, US
• William F. Gardei · Derry, US

Key dates

• Filing date: Jan 18, 2000
• Grant date: Jul 9, 2002
• Expiry date: Jan 18, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R21/133
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An analog to digital converter system includes first and second delta sigma converters, a calculation engine, and a serial interface on a single chip. The calculation engine is configured to calculate energy, power, rms current and voltage for single phase 2 or 3 wire power meters. Voltage and current are measured with a shunt or transformer, and a divider or transformer, respectively. The serial interface is bidirectional for communication with a microprocessor or controller, and provides a fixed width programmable frequency output proportional to energy. The digital converter system is user system calibratible.