Abstract
This paper provides a comparative study on radiation noise reduction methods for inductive power transfer systems using spread spectrum. In the spread spectrum methods, the radiation noise is reduced by continuously changing an output frequency of the inverter according to pseudorandom numbers. The effects of the radiation noise reduction are evaluated with the inductive power transfer (IPT) system with series-parallel compensation and series-series compensation. The results show that the peak values of the radiation noise around the fundamental frequency are reduced by 7.8 and 8.1 dBμA in maximum with the series-series compensation method and the series-parallel compensation method, respectively in comparison with the constant frequency operation. From these results, the proposed methods are effective for both the series-series compensation and series-parallel compensation method. Moreover, the efficiency of the IPT system with spread spectrum method is evaluated. The maximum DC-to-DC efficiency with the spread spectrum is 94.1% and 92.0% with the series-series compensation and the series-parallel compensation, respectively.
Highlights
In recent years, inductive power transfer (IPT) systems for electric vehicles (EVs) have been actively studied and developed [1,2,3,4,5,6,7]
The practical realization of the IPT systems for EVs or plug-in hybrid EVs (PHEVs) is highly desired because the IPT systems will improve the usability of the EVs and the PHEVs
In order to employ the IPT systems into practical applications, the radiation noise must be suppressed to satisfy existing standards, such as the well-known standard based on CISPR11, i.e., a standard regulated by the International special committee in radio interference
Summary
Inductive power transfer (IPT) systems for electric vehicles (EVs) have been actively studied and developed [1,2,3,4,5,6,7]. Suppression methods using a magnetic material or metal shield have been proposed [9,10,11,12]. In order to suppress the radiation noise, transmission coils are surrounded by plates composed of magnetic material or metal plate. The additional shields (magnetic or metal) current increases the power loss of the IPT systems. The authors have proposed two radiation noise reduction methods, metal) lead to an increase in cost. In [14], the radiation noise reduction effect of these two proposed methods have been evaluated with the at the rated power [14]. In [14], the radiation noise reduction effect of these two proposed methods.
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