Frequency Shift Keyed Dual Side Control of Inductive Power Transfer: An Application of Talkative Power Conversion

Abstract:
Progress in control of Inductive Power Transfer (IPT) has resulted in Dual Side Controllers (DSC) which retain high efficiencies for a wide parameter range. These control schemes require coordination between the separate system sides. To avoid radio communication, hence extra system layers, and to enable underwater operation, communicationless and cooperative controllers have been proposed. They are significantly limited in which parameters can be tracked and generate additional design constraints. This paper instead applies the recent idea of Talkative Power Conversion (TPC) to IPT by proposing a low bandwidth Frequency Shift Keying (FSK) process. It is demodulated via the preexisting phase locked synchronization loop to implement communication of arbitrary information. The communication is demonstrated in experiment by utilising it for DSC of a Gallium Nitride (GaN) based Series-Series (SS) compensated 500 W 48 V IPT system with an Asymmetric Voltage Cancellation (AVC) waveform and a frequency shift of 8 Hz.