Input frequency measurement
US9680382B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2015 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Dec 2, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A frequency determination circuit includes a positive crossing sense circuit coupled to receive an input voltage to sense a positive crossing of an input voltage. A validation circuit is coupled to the positive crossing sense circuit to validate a previous zero crossing and the positive crossing of the input voltage after the positive crossing of the of the input voltage has occurred. A measurement circuit is coupled to the positive crossing sense circuit and the validation circuit to count a time between positive crossing pulses of the input voltage. The measurement circuit is coupled to output a frequency signal that is representative of a frequency of the input voltage in response to the time between the positive crossing pulses of the input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.