Abstract
Wireless charging technology for heavy-duty vehicles has been investigated for eco-friendly transportation. We present a new wireless power transfer system for 44 kW rapid charging of electric buses. The transmission distance between the charging pads is from 10 to 13 cm. The large air gap can be fulfilled by the ordinary kneeling function, equipped on most low-floor buses. Dual-block parallel transmission with opposite-phase-current-feeding suppresses magnetic radiation. The system operates in the common 85 kHz band with the light-duty vehicle system. The result of the field test and the public road operation of two electric buses confirm the CO2 reduction effect described.
Highlights
The deployment of various sorts of electric vehicles, such as plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs), including light-duty vehicles and heavy-duty vehicles, such as electric buses and cargo trucks, is expected to be an important development contributing to the emergence of a low-carbon society
We present a new wireless power transfer system using the 85 kHz band for 44 kW rapid charging of electric buses, which is similar to the current conductive rapid charger
The detailed analysis results focused on the regenerative energy made by the medium-sized electric bus running on the expressway, including seasonal variation, is described in [14,15]
Summary
The deployment of various sorts of electric vehicles, such as plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs), including light-duty vehicles and heavy-duty vehicles, such as electric buses and cargo trucks, is expected to be an important development contributing to the emergence of a low-carbon society. Wireless charging technology [4,5,6,7,8] for light-duty vehicles has been actively researched and SAE (Society of Automotive Engineers) International Task Force J2954 has been leading its standardization activities. In April, 2019, the task force released its second Recommended Practice (RP2) [9], based on their extensive testing results. This RP2 will be used for interoperability, performance, and emissions testing, where a single standard coil-set is chosen for WPT (Wireless Power Transfer) power class 1, 2 and 3, up to 11 kW using circular topology
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