Methods and systems for measuring power in wireless power systems
US9784777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2014 |
| Grant date | Oct 10, 2017 |
| Priority date | — |
| Expiry date | May 12, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00286
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a method and system for precisely measuring AC power and detecting load impedance using a precise analog front-end, zero-crossing detectors, and a phase detection system capable of extracting precise phase information from the sensed voltage and current measurements. More particularly, the invention provides an apparatus, comprising a transmit circuit configured to generate a wireless field via an antenna for transferring charging power to a receiver device, for determining a phase difference between a first signal and a second signal. The apparatus further comprises a phase detection circuit to output a phase signal indicating a duration of a phase offset between a time-varying voltage and a time-varying current of the transmit circuit. The apparatus further comprises a capacitor configured to receive a variable current from a current source for the duration of the phase offset between the time-varying voltage and a time-varying current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.