UNIDIRECTIONAL POWER AND BI-DIRECTIONAL DATA TRANSFER OVER A SINGLE INDUCTIVE COUPLING

摘要

The present invention provides an inductive transmission system for inductive tr ansmission of power and full duplex data signals between a first device (1) and a second device (2) . The transmission system comprises: - a bi-directional induc tive channel (6) between the first device (1) and the second device (2), - first transmission means (121) for transmitting a power signal at a first frequency f rom the first device (1) to the second device (2) over the inductive channel (6) - a first modulating device (21) for modulating a first data signal at a first modulation frequency, - a second modulating device (15) for modulating a second data signal at a second modulation frequency, - second transmission means (124) for transmitting the modulated first data signals from the first device (1) to the second device (2) over the inductive channel (6), and for transmitting the m odulated second data signals from the second device (2) to the first device (1) over the inductive channel (6), wherein the first modulation frequency and the s econd modulation frequency are at least a factor two apart, and wherein the tran smission system furthermore comprises signal cancellation means or compensatio circuit for compensating for the sent data signal, providing a full duplex path without interference from the own sent signals at a device side.