Open AccessFrequency tracking and tuning control of wireless power transfer system
Author(s) -
Ziyi Liu,
Hao Zhan
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2108/1/012023
Subject(s) - control theory (sociology) , inverter , wireless power transfer , transfer function , power (physics) , electrical impedance , automatic frequency control , pulse width modulation , computer science , maximum power transfer theorem , electromagnetic coil , rlc circuit , resonant inverter , matlab , electronic engineering , voltage , engineering , physics , control (management) , electrical engineering , capacitor , telecommunications , quantum mechanics , artificial intelligence , operating system
A tuning control method with frequency tracking function is proposed to improve the degradation of efficiency caused by coil detuning in magnetically-coupled resonant wireless power transfer. Firstly, the detuning mechanism is studied by combining the AC impedance characteristics of the series resonant circuit, and the feedback control circuit is constructed by using a modified phase-locked loop, which outputs a variable frequency PWM wave to regulate the operating frequency of the high frequency inverter and maintains the phase difference between the inverter output voltage and the original side current within the error range. The Matlab/Simulink simulation results show that the design can successfully transfer the system to a new resonant state with short regulation period and high control accuracy, which can effectively improve the transmission efficiency and load power of the system.