A Novel Noncommunication-Based Inductive Power Transfer Control Technique

This paper proposes a novel noncommunication-based control strategy with a simple switched controlled capacitor (SCC) design at the receiver side of the IPT system. A series-inductor-capacitor-capacitor (S-LCC) compensation network is selected to verify the proposed control strategy. Without feedback wireless communication, the proposed IPT system can realize reliable constant current (CC) and constant voltage (CV) output control over full load range at a fixed switching frequency. At the receiver side, SCC is introduced to control reactive current and convey the output-side information to the transmitter side in the form of impedance angle. At the transmitter side, impedance angle is detected in real time, and phase shift control is introduced to regulate the output voltage or current of the system. Zero voltage switching (ZVS) is also achieved during the whole charging process. A 250W experimental prototype is built in the laboratory to verify the proposed control strategy.