Electric circuit arrangement and a method for a galvanically insulated, AC/DC sensitive differential-current measurement having high resolution
US11573250B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 2021 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Apr 29, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/217
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric circuit arrangement and a measuring method for a galvanically insulated, AC/DC sensitive differential current measurement having a high resolution having: a toroid current transformer having at least one secondary winding for detecting a differential current; a driver circuit for powering the secondary winding; a first oscillator circuit for controlling the driver circuit and for generating a time-modulated binary oscillator signal having dwell times in a state 1 and a state 2; a second oscillator circuit for determining the corresponding dwell time in the states 1 and 2 in high resolution by means of a clock signal having a clock rate independent of the oscillator signal; an evaluation device for evaluating the dwell time; and a data interface for outputting a differential-current measuring value; the driver circuit and the second oscillator circuit each being realized as structurally individual, integrated circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.