Multi-load parity-time symmetry wireless power transmission system with active directional energy transmission

A novel multi-load Parity-Time (PT) wireless power transmission (WPT) system with active directional energy transmission is designed. Firstly, we utilize a variable capacitor array to achieve selective mutual coupling between a single transmitting coil and multiple receiving coils. Then, under the action of the control circuit, the system can prioritize charging low-capacity batteries and automatically switch charging modes after the load is charged. Furthermore, different from the existing multi-load PT-WPT system, the DC-DC converter is added to the receiving device in this design. The DC-DC converter ensures that the system can provide constant current (CC) or constant voltage (CV) charging modes depending on the load requirements. Through the above design, we have constructed a new multi-stage charging mode in the multi-load PT-WPT system. The experimental results show that the system can achieve active directional energy transfer and provide different charging modes according to the needs of the loads. Moreover, the system also exhibits features such as a wide coupling and actively switching charging modes. The use of a multi-load PT-WPT system with active directional energy transmission can provide efficient charging strategies for wireless sensor networks with multiple loads.