AC voltage sensing for voltage regulators
US4970458A · kind A · utility
5Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | May 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A voltage-sensing circuit producing a voltage-indicating signal representative of the voltages in a three-phase AC system produces several voltage-indicating signals which are representative of the phase voltages in a three-phase AC system. These voltage-indicating signals are squared, and the squared voltages are summed to produce an output signal having a DC voltage component with a magnitude proportional to the Mean Square value of the AC phase voltages. Unbalanced voltages in the three-phase system can be monitored by detecting the peak value of a ripple voltage imposed on the DC voltage component of the output of the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.