Resolver to 360.degree. linear analog converter and method

US6104328A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Dean C. Alhorn · Huntsville, US
• David E. Howard · Hazel Green, US
• Dennis A. Smith · Athens, US

Key dates

• Filing date: Nov 27, 1998
• Grant date: Aug 15, 2000
• Expiry date: Nov 27, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/2073
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The converter produces a linear analog signal that is linearly proportional to a shaft angle of a resolver over 360.degree.. An excitation cosine signal supplied to the resolver and a response cosine signal received from the output windings of the resolver are converted to logic level signals. Digital logic is performed on the logic level signals in a programmable digital logic device to produce a logic level pulse-width modulated signal. The logic level pulse-width modulated signal is used to control a switch to switch between two reference voltage levels to produce a pulse-width modulated signal, which is filtered and buffered to produce the linear analog signal.