Adaptive impedance tuning in wireless power transmission
US8338991B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2010 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Jan 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Exemplary embodiments are directed to wireless power. A wireless power receiver includes a receive antenna for coupling with near field radiation in a coupling-mode region generated by a transmit antenna operating at a resonant frequency. The receive antenna generates an RF signal when coupled to the near field radiation and a rectifier converts the RF signal to a DC input signal. A direct current-to-direct current (DC-to-DC) converter coupled to the DC input signal generates a DC output signal. A pulse modulator generates a pulse-width modulation signal to the DC-to-DC converter to adjust a DC impedance of the wireless power receiver by modifying a duty cycle of the pulse-width modulation signal responsive to at least one of a voltage of the DC input signal, a current of the DC input signal, a voltage of the DC output signal, and a current of the DC output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.