Arrangement for measuring an electrical power or energy
US5032785A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Mar 23, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R21/127
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an arrangement for measuring an electrical power or energy, for each of a plurality of phases, the arrangement includes a voltage input in a transformer supplied with current and connected to an integrator with a high ohm input. Each transformer is connected via an integrator with a high ohm input to a mark-space-amplitude modulator, one of which is provided per phase. Each voltage input is also in communication with the corresponding mark-space-amplitude modulator. Each mark-space-amplitude modulator comprises a mark-space modulator and a pulse amplitude modulator. Each pulse amplitude modulator is provided with two push-pull outputs, each of which is connected to an input of a current/frequency converter for the integration of marks (pulses) and spaces (i.e. spaces between pulses) present at the output of the pulse amplitude modulator. The current/frequency converter is connected to processing and display circuitry for displaying an output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.