Method and apparatus for a half-bridge variable differential transformer position sensing system
US8872508B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2012 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | May 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A half-bridge variable differential transformer position sensing system that includes a transducer having a stator with an inductive coil having a center tap configured to provide an output signal. The transducer also has an armature with a magnetically permeable core configured to move within the inductive coil, such that movement of the magnetically permeable core causes a change in the output signal. The position sensing system includes a first circuit configured to provide an excitation signal at one terminal of the inductive coil. The system includes no more than three electrical interface wires, and a microcontroller configured to calculate the degree of change in the position of the magnetically permeable core, and is configured to correct for variations in the voltage of the output signal due to the temperature of the transducer and due to non-linear effects on the output signal caused by movement of the magnetically permeable core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.