Wireless power feeder, wireless power receiver, and wireless power transmission system
US8729735B2 · kind B2 · utility
14Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 11, 2010 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Dec 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Power is fed from a feeding coil L2 to a receiving coil L3 by magnetic resonance. A VCO 202 alternately turns ON/OFF switching transistors Q1 and Q2 at a drive frequency fo, whereby AC power is fed to the feeding coil L2, and then the AC power is fed from the feeding coil L2 to the receiving coil L3. A phase detection circuit 114 detects a phase difference between the current phase and voltage phase, and the VCO 202 adjusts the drive frequency fo such that the phase difference becomes zero. When load voltage is changed, the detected current phase value is adjusted with the result that the drive frequency fo is adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.