Device and method for evaluating signals of load cells with strain gauges
US9052247B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 2012 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Feb 9, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G3/142
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device and a method for evaluating signals from load cells with strain gauges (SG), which require electronic signal evaluation with very low offset voltages due to the small output signal. In order to be able to use inexpensive components as well, two different operating points of the SG are set in two consecutive measurements, each being determined by a single voltage reference. The voltage in the zero branch of the bridge circuit of the SG is amplified in a differential amplifier and digitized with an ADC. In this context, the reference for the ADC is derived from the operating point of the SG that is determined by the respective voltage reference. The digitized offset and the initial value of the load cell are calculated from the two measurement values in an arithmetic logic unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.