Method and circuit for measuring of current
US4460867A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1981 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Oct 7, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and device for the contactless measuring of direct and alternating current, in particular current instantaneous values, by using a magnetic circuit having an air slot and a magnetic field dependent resistor through which a control current flows and a winding through which a measuring current flows. In order to provide a large measuring speed for picking up a rapid instantaneous value, for example, generated high current peaks, at least a further winding is mounted on the magnetic circuit, the voltage drops on the magnetic field dependent resistor are picked up and stored at the peak values or other typical values of the current to be measured. After completing the measuring current, the current in the equivalent current winding is increased and the already stored voltages corresponding to the measuring current are compared consecutively with the voltage drops on magnetic field depending resistor, corresponding to the increase in the amount in the equivalent current winding. At the same voltage values, the instantaneous current is determined by multiplying in the current in equivalent current winding by the winding number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.