## 8 Conclusions  
Combined wireless power and information transfer technology can accelerate the progression of wireless charging into practical applications. In this work, near-field-based communication that shares the same physical space with a WPT system was designed. The communication coil was integrated into the WPT coil on both the GA and VA sides for a peer-to-peer feature, making it easy to achieve a simple pairing of the GA and the VA. This prevents mismatching in multiple-GA and multiple-VA scenarios, which can occur when using far-field communication, such as WLAN and Bluetooth. The crosstalk from the power transfer to the information transfer was suppressed via analog filters that integrated amplifiers and a digital filter in the FPGA. Together with the integrated communication coils that were decoupled from the WPT coil, the communication was also robust to the power transfer under misaligned conditions. Thanks to the established communication, first, the inverter and the active rectifier were co-controlled using shared control parameters (i.e., a duty cycle, a phase offset between the inverter and the rectifier) through communication with an ultra-low latency. Second, the inverter and active rectifier were synchronized using the communication signal. The novel synchronization method using the communication signal provides an alternative solution for active rectification in WPT systems, which requires no AC current sensing in the power path and does not depend on the WPT system parameter; thus, no destabilization concerns result due to parameter drifting. Using the presented synchronization and calibration algorithm, the communication errors and the  
Figure 18: Experimental results concerning prototype efficiencies during the CC stage of the charging process.  
drift of the synchronization position due to the charging pads' misalignment were avoided. The proposed prototype for combined wireless power and information transfer with LCC-LCC compensation was measured at different operating points in the CC and CV stages. The results show that the presented prototype allows a bidirectional power transfer up to 1.2 kW, and efficiency above 90% for the power ranges from 0.6 kW to 1.2 kW was obtained. Furthermore, the integrated communication that is robust to the crosstalk from the power transfer and misalignment, a zero BER (bit error rate), and an ultra-low latency of 15.36 us were achieved.  
Conceptualization, W.Y. and N.P.; data curation, W.Y.; formal analysis, W.Y. and N.P.; funding acquisition, N.P.; investigation, W.Y. and N.P.; methodology, W.Y. and N.P.; project administration, W.Y. and N.P.; resources, N.P.; software, W.Y.; supervision, N.P.; validation, W.Y.; visualization, W.Y.; writing--original draft, W.Y. and N.P.; writing--review and editing, W.Y. and N.P. All authors have read and agreed to the published version of the manuscript.  
FundingFunded by the German Federal Ministry for Economic Affairs and Climate Action under 01 MV21007D.  
Data Availability StatementData are contained within the article.  
The funders played no role in the design of the study, in the collection, analyses, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results.