Wireless power transfer (WPT) technology is now recognized as an efficient means of transferring power without physical contact. However, frequency detuning will greatly reduce the transmission power and efficiency of a WPT system. To overcome the difficulties associated with the traditional frequency-tracking methods, this paper proposes a Direct Phase Control (DPC) approach, based on the Second-Order Generalized Integrator Phase-Locked Loop (SOGI-PLL), to provide accurate frequency-tracking for WPT systems. The DPC determines the phase difference between the output voltage and current of the inverter in WPT systems, and the SOGI-PLL provides the phase of the resonant current for dynamically adjusting the output voltage frequency of the inverter. Further, the stability of this control method is analyzed using the linear system theory. The performance of the proposed frequency-tracking method is investigated under various operating conditions. Simulation and experimental results convincingly demonstrate that the proposed technique will track the quasi-resonant frequency automatically, and that the ZVS operation can be achieved.
Wireless power transfer (WPT) technology is now recognized as an efficient means of transferring power because having numerous advantages over conventional wired power transfer system. The phase delays, for example induced in the sampling process, the algorithm implementation process, the signal transduction process, etc. are widely found during the implementation of WPT system, which significantly degrade the system performance. Moreover, it would be extremely necessary to implement the Soft-Switching of the converter and the necessary dead time imposed by the drivers should be compatible with the resonant current phase lag control. This paper proposes a Direct Phase Control (DPC) approach, based on Second-Order Generalized Integrator Phase-Locked Loop (SOGI-PLL), to provide accurate phase compensation and stable ZVS operation in the WPT. The DPC determines the phase difference ∆ of WPT, which include the phase difference between the output voltage and current of the converter and the phase delay derived from the sampling process. The SOGI-PLL provides the phase of system for adjusting the output voltage frequency of the converter dynamically. Experimental results convincingly demonstrate that with the proposed method the phase delay can be compensated accurately and the ZVS operation can be achieved simultaneously.
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