Unidirectional power and bi-directional data transfer over a single inductive coupling

An inductive transmission system for inductive transmission of power and full duplex data signals between a first device and a second device, comprising:

• a bidirectional inductive channel between the first device and the second device,
• first transmission means for transmitting a power signal at a first frequency from the first device to the second device over the inductive channel,
• a first modulating device for modulating a first data signal at a first modulation frequency,
• a second modulating device for modulating a second data signal at a second modulation frequency,
• second transmission means for transmitting the modulated first data signals from the first device to the second device over the inductive channel, and for transmitting the modulated second data signals from the second device to the first device over the inductive channel,
• wherein the first modulation frequency and the second modulation frequency are an even factor apart, wherein the transmission system furthermore comprises detection means for demodulating the first data signal at the first device and demodulating the second data signal at the second device and signal cancellation means for cancellation of the first data signal from the second data signal received at the first device and cancellation of the second data signal from the first data signal received at the second device.