Hybrid Coupler For 6.78 Mhz Desktop Wireless Power Transfer Applications With Stable Open-Loop Gain
IET POWER ELECTRONICS(2019)
摘要
The open-loop gain of capacitive power transfer (CPT) circuit, especially for applications like wireless charging of laptop or keyboard, is sensitive to the changes of coupling capacitance, which makes the regulating of output voltage and output power difficult. Hybrid coupler has been proved to be able to combine the advantages of both inductive power transfer (IPT) and CPT. In this study, a hybrid coupler is designed with the aim of keeping a stable open-loop gain when the coupling capacitance changes. The structure as well as the operation principles of the hybrid coupler is explained firstly. Then, the open-loop gains of CPT, IPT and hybrid wireless power transfer (HWPT) are derived and followed by a simplified design guideline of the whole HWPT system using the proposed hybrid coupler. Finally, the proposed coupler is verified with a 40 W, 6.78 MHz experimental prototype.
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关键词
inductive power transmission, radiofrequency power transmission, waveguide couplers, hybrid coupler, stable open-loop gain, capacitive power transfer circuit, wireless charging, coupling capacitance changes, hybrid wireless power transfer, output voltage regulation, output power regulation, desktop wireless power transfer applications, inductive power transfer, open-loop gains, HWPT system, frequency 6, 78 MHz, power 40, 0 W
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