Energy Management and Micro Energy Technology
Fraunhofer Institute for Integrated Circuits
Wireless Energy Transmission
- Block diagram of an inductive charge regulater
Mobile terminal devices usually have rechargeable batteries to supply power to the different electronic circuits. In order to be recharged the battery must be cable-connected to a charger and the mains power supply. Charger, wiring and connectors are often sources of error. Moreover the charger and connectors are not always compatible with different terminal devices, making it necessary for each device type to have its own customized battery-charging solution.
Wireless power transmission eliminates the need for wiring and connectors in mobile terminal equipment
It is the ideal solution when little board space is available and low costs are of paramount importance. Other application areas cover totally encapsulated or isolated devices with integrated rechargeable batteries.
The Fraunhofer Institutefor Integrated Circuits IIS has developed an inductive charge regulator which can be used for portable devices such as mobile phones, PDAs, watches, RFID systems and wireless sensors.
- Depending on the application and the employed components, e.g. antennas or resistors, different AC frequencies can be employed for power transmission.
- The system can be combined with a communication interface between charger and terminal device using the same components and frequency band.
- The entire functionality can be implemented on a single integrated circuit with very few external components. Ideally only an antenna is required. This can be realized as a foil component to achieve a flexible device, e.g., for integration into textiles, paper or thin-film products.
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