A Wide Output Voltage Range and High Efficiency Dual-Channel WPT System Employing Multimode Control Strategy

Flexible output regulation and high efficiency are key requirements for wireless power transfer systems. However, it is a challenge to maintain high efficiency in wide output voltage range applications due to the limited regulation range of converters. To address this issue, in this article, two power transmission channels based on the LCC-LCC compensation network are used to improve system efficiency within a wide operation range. Multiple operation modes of two power channels are utilized to obtain multiple operation ranges with different optimal output voltages. Then, a multimode control strategy for two power channels is proposed to achieve optimal efficiency with different output voltage ranges. By properly switching the operation mode of these power channels, the system can always operate in an optimal range, thus the overall efficiency can achieve a high level even in not only heavy load, but also light load conditions. An experimental prototype with 100 to 420 V output voltage is constructed. Experimental results show that the proposed method can achieve an overall efficiency of 93.8% to 96.5%. © 2024 IEEE.