A Hybrid-Frequency-Based Multi-Load Wireless Power Transfer System With Constant Current or Voltage Outputs

This article proposed a hybrid-frequency-based multi-load (HFML) wireless power transfer (WPT) system that simultaneously powers multiple loads with independent regulation. The primary side of this system uses a hybrid-frequency compensation network, which is equivalent to series resonant compensation and inductor-capacitor-capacitor (LCC) resonant compensation, respectively, at different resonant frequencies. Thereby, receivers with series compensation structures but different resonant frequencies can, respectively, achieve constant current or voltage (CC/CV) outputs. Through hybrid-frequency modulation, the two arms of the H-bridge inverter are driven by different switching frequencies and duty cycles to generate transmitter current with hybrid frequency components superimposed. Resonant capacitors are used in the secondary circuits to reduce the impact of cross-interference between the multi-loads, facilitating the selection of the designed power transmission channel and realizing the independent regulation of receivers. A prototype with two receivers has been set up with the working frequencies at 80 and 200 kHz. The experimental results show that two receivers are well-decoupled with low cross-interference, realizing the independent regulation of multiple loads. Besides, the current of receiver 1 exhibits CC output, and the voltage of receiver 2 exhibits CV output.