Inductively-powered power transfer system with one or more independently controllable loads
US7633235B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2004 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Mar 10, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a system for controlling one or more operating unites in an inductive power transfer (IPT) system. Each operating unit includes a pick-up coil that takes power from a primary conductor or track over an air gap. The operating unit is controlled by frequency modulating the primary conductor power supply to send a control instruction which is decoded by the operating unit. The instruction is decoded by generating a signal using a local oscillator in the operating unit and using the signal to detect changes in the frequency of the current in the primary conductor. Such a system can be used, for example, to control inductively powered road-studs that include a light source for controlling traffic on a roadway. A narrow band modulated data transmission system and method for controlling an operating unit are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.