Power transmission device
US8258652B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2009 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | May 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power transmission device includes: a power transmission coil to transmit electric power to a power receiving coil by an electromagnetic induction method; a driving unit to supply a driving voltage to the power transmission coil; a detection unit to detect an electric current flowing in the power transmission coil based on the driving voltage; a control unit to change an amplitude of the driving voltage; a starting point detection unit to detect the amplitude of the driving voltage as a characteristic point at which an electric current starts to flow in the power receiving coil, on a characteristic line representing a relationship between the driving voltage supplied to the power transmission coil and the electric current detected by the detection unit; and a transmission stopping control unit to stop power transmission by the power transmission coil if the characteristic point is not detected by the starting point detection unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.