Abstract
For wireless charging of electric vehicles (EVs), increasing the output power level is particularly important. In this paper, the purpose of improving the output power while maintaining optimal transmission efficiency is achieved by optimizing the parameters of the compensation topology under the premise that the coupled coils of the system does not need to be redesigned. The series-series (SS) and hybrid-series-parallel (LCC, composed by an inductor and two capacitors) compensation topology are studied. The influence factors of load resistance to achieve optimal efficiency, the influence of LCC compensation parameters on the power output level, and the influence of parameter changes on system safety are analyzed. Theorical results show that by rationally designing the LCC compensation parameters, larger output power and optimal transfer efficiency can be achieved under different load resistance by adjusting the inductances of the primary and secondary compensation circuits. The output power of the optimized system with adjusted LCC compensation topology is increased by 64.2% with 89.8% transfer efficiency under 50 ohms load in experiments. The correctness and feasibility of this parameter design method are verified by both theorical and experimental results.
Highlights
Since the concept of magnetic coupled resonant wireless power transfer (MCR-Wireless Power Transfer (WPT)) was proposed by MIT in 2007, the technology has developed rapidly and has been widely applied in implantable medical devices, home appliances, mobile devices and electric vehicles [1–8]
The compensation topology has a great impact on the output power level
It can implement zero phase angle (ZPA) and zero voltage switching (ZVS), and its output current is independent of the load [12–17]
Summary
Since the concept of magnetic coupled resonant wireless power transfer (MCR-WPT) was proposed by MIT in 2007, the technology has developed rapidly and has been widely applied in implantable medical devices, home appliances, mobile devices and electric vehicles [1–8]. In addition to the four basic resonance topologies described above, hybrid-series-parallel (LCC, composed by an inductor and two capacitors) compensation topology has been extensively studied for its excellent performance It can implement zero phase angle (ZPA) and zero voltage switching (ZVS), and its output current is independent of the load [12–17]. Methods are proposed proposed increase output power while maintaining optimal transmission without to increasetooutput power level whilelevel maintaining optimal transmission efficiencyefficiency without redesign redesign of thecoils coupled coils by optimizing the parameters of LCC compensation. Both theorical theorical and experimental results indicate that the proposed parameter optimization strategy is and experimental results indicate that the proposed parameter optimization strategy is effective in effective in improving transfer efficiency and adjusting output power under different load resistances.
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