Dual‐Frequency Power Distribution Method for Omnidirectional Wireless Power Transfer System

摘要

ABSTRACT Omnidirectional wireless power transfer (OWPT) systems are widely used in consumer electronic products (CEPs), industrial robots, medical devices, and more. However, the different CEPs usually have different power and frequency requirements to ensure various transmission characteristics. In order to meet the transmission requirements of CEPs with different power and frequency needs, this paper proposes a novel dual‐frequency power allocation method for OWPT. This method achieves independent regulation of output power for loads of different frequencies through the designed SS topology dual‐frequency resonant compensation structure and establishes corresponding parameter design methods. A dual‐frequency OWPT platform operating at 40 kHz/100 kHz was built to verify the correctness and effectiveness of the power allocation method. Experimental results show that when the input voltage corresponding to only one frequency changes, only the output power of the load corresponding to that frequency changes accordingly. Meanwhile, under the condition of dual‐load power supply, when the receiving coil is within a 90° offset range, the system's output power ranges from 49.25 to 57.15 W with a fluctuation rate of 14.8%, and the output efficiency ranges from 76.67% to 78.68% with a fluctuation rate of 2.59%.