Open AccessOutput control of wireless power transmission system based on dynamic parameter tuning
Author(s) -
Benchao Xu,
ZhiHui Wang,
Keke Shi,
Hao Long,
Chunsen Tang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/647/1/012004
Subject(s) - constant current , capacitance , voltage , computer science , battery (electricity) , capacitor , power (physics) , electrical engineering , inverter , control theory (sociology) , correctness , wireless power transfer , wireless , electronic engineering , engineering , control (management) , telecommunications , physics , electrode , quantum mechanics , artificial intelligence , programming language
Flexible output power control is very important for wireless power transmission system. In the wireless charging application of electric vehicles, the load is usually the battery. For the battery, both constant current charging and constant voltage charging are needed. In the constant voltage stage, the current should continue to decrease, so we need to adjust the output current of the system in the later stage of charging. Nowadays, the main methods used in WPT system are phase shift and pulse width modulation, adding a first stage DC-DC circuit before the inverter, and controlling the energy injection of the transmitting coil. In view of its shortcomings, this paper uses a method based on adjusting capacitor parameters to achieve output control. Firstly, the influence of capacitance parameters on output current is analyzed, and the relationship between capacitance parameters and output current is deduced; secondly, its advantages are analyzed, and the working principle is analyzed through simulation; finally, the feasibility and correctness of the control method are verified by experiment and simulation.