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<p>The short-circuit fault (SCF) in the inverter poses a significant threat to wireless power transfer (WPT) in electric vehicles. Considering the extremely short formation time of SCFs and the susceptibility of detection to external interference, this paper proposes a short-circuit current (SCC) suppression circuit structure (SCS) composed of an inductor, capacitor, resistor, and diode arranged in series and in parallel. This structure suppresses the increase in SCC, providing sufficient time for SCF protection to function and effectively reducing the risk of system damaged when SCFs occur. First, an LCC-S compensation WPT system model is established for the inverter under SCF conditions. Then, the impact of the SCS on the normal operation of the WPT system is analyzed, and the criteria for selecting the SCS parameters are established. Finally, an experimental LCC-S compensation WPT system platform with an SCC suppression function is built using Si-based MOSFETs, and the experiments are conducted to validate the performance of the proposed structure. Results show that the SCS can effectively delay the increase in SCC. Moreover, in the event of an SCF, the high voltage of the structure can effectively serve as the SCF diagnosis signal. Notably, the system eliminates SCFs within 700&#xa0;ns, which is much shorter than the SCC duration most semiconductor switching devices can withstand, thereby protecting the circuit.</p>

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Short-circuit current suppression strategy for inverter in LCC-S compensation wireless power transfer system

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Xuelong Han,
  • Haoyang Cheng,
  • Chenyang Xia,
  • Yinzhong Ye

摘要

The short-circuit fault (SCF) in the inverter poses a significant threat to wireless power transfer (WPT) in electric vehicles. Considering the extremely short formation time of SCFs and the susceptibility of detection to external interference, this paper proposes a short-circuit current (SCC) suppression circuit structure (SCS) composed of an inductor, capacitor, resistor, and diode arranged in series and in parallel. This structure suppresses the increase in SCC, providing sufficient time for SCF protection to function and effectively reducing the risk of system damaged when SCFs occur. First, an LCC-S compensation WPT system model is established for the inverter under SCF conditions. Then, the impact of the SCS on the normal operation of the WPT system is analyzed, and the criteria for selecting the SCS parameters are established. Finally, an experimental LCC-S compensation WPT system platform with an SCC suppression function is built using Si-based MOSFETs, and the experiments are conducted to validate the performance of the proposed structure. Results show that the SCS can effectively delay the increase in SCC. Moreover, in the event of an SCF, the high voltage of the structure can effectively serve as the SCF diagnosis signal. Notably, the system eliminates SCFs within 700 ns, which is much shorter than the SCC duration most semiconductor switching devices can withstand, thereby protecting the circuit.