A DC-link Series-Parallel Rectifier for 400-V and 800-V WPT Systems with Different Z Classes

Citation Author(s):
Yan
Li
Submitted by:
Yan Li
Last updated:
Tue, 02/04/2025 - 05:30
DOI:
10.21227/nv5a-dp81
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Abstract 

Wireless power transfer (WPT) systems for electric vehicles (EVs) need to accommodate different vehicle models with varying battery voltages and Z classes, while ensuring the power, efficiency, volume, cost, and compatibility of different vehicle assemblies (VAs). To address these challenges, this article proposes a series-parallel dual rectifier architecture based on the LCC-S compensation network. The characteristics of conventional topologies are analyzed mathematically, which may have a low output power under large coupling coefficient variations. Then, the proposed system is presented and the system feasibility is demonstrated through the analysis of power transmission, power losses, and voltage-current sharing characteristics between rectifiers. The design principles of the system are also explained in detail. The system can adapt to a wide battery voltage range and different Z classes without adding DC/DC converters or changing resonant compensation networks. A 4 kW WPT prototype under Z1 or Z2 class with 400 V or 800 V battery voltage is established. A maximum DC/DC efficiency of 92.2% is obtained, validating the feasibility of the system.

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