Bridge-based impedance sensor system
US11994546B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2022 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Nov 19, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96075
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An impedance sensing circuit includes three impedance elements and a sensing element arranged in a bridge configuration. A first input terminal is coupled to two of the impedance elements to apply a stimulus signal. In a mutual-sensing mode, a second input terminal is coupled to the third impedance element and the sensing impedance element to apply an opposite phase stimulus signal. The impedance sensing circuit may be configured in a self-sensing mode, in which the opposite phase stimulus signal is decoupled from the third impedance element and the sensing impedance element. At least one of the impedance elements is variable and may be adjusted to balance an offset impedance load on the sensing element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.