Abstract
The wireless power transfer (WPT) system has attracted attention for energy transmission without physical contact. However, a WPT system has low coupling condition because of a big air gap between transmitter and receiver coils. The low coupling condition has a high leakage inductance. To overcome this problem, we design a proposed system for WPT using series-series (S-S) topology of one resonant circuit. To obtain the higher efficiency power conversion of the WPT system, it has to operate the resonant frequency in the zero phase angle (ZPA) point even under mutual coefficient and load variation. Therefore, we propose the resonant frequency tracking algorithm to operate ZPA point based on the second order generalized integrator-frequency locked loop (SOGI-FLL) method. This proposed frequency-tracking algorithm can estimate ZPA point by changing switching frequency. We can reduce the switching loss with this proposed algorithm and improve the low conversion efficiency of the WPT system. The performance of the proposed frequency-tracking algorithm is automatically verified through various coupling coefficients and the load variation.
Highlights
User-friendly products have become very important in the industry
We propose the new wireless power transfer (WPT) system with the frequency tracking algorithm for zero phase angle (ZPA) operation and the SOGI-FLL
When the the distance distance between between the the transmitting transmitting and and the the receiving receiving coils coils is is changing, changing, the ZPA point changes according to the variation of the coupling coefficient (k)
Summary
User-friendly products have become very important in the industry. In particular, many research projects have been actively conducted on wireless power transfer (WPT) technology that can bring high improvements to mobile devices. The second-order generalized integrator-frequency-locked loop (SOGI-FLL) and second-order generalized integrator-phase-locked loop (SOGI-PLL) based on and adaptive filter is widely used in solar power system to synchronize in grid These methods are less sensitive to alterations and disturbances of the input signal. To overcome the traditional frequency-tracking problems, we propose the frequency-tracking algorithm based on the SOGI-FLL with S-S topology which is easy to control and analysis, to operate zero phase angle (ZPA) state in the resonant frequency. This algorithm finds the ZPA point by changing the switching frequency, following the primary current.
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