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A Novel Synchronization Technique for High Frequency Rectifier in Wireless Power Transfer
Yongbin Jiang,Min Wu,Zexian Zeng,Yonghui Liu,Xiufang Hu,Laili Wang,Yue Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a novel synchronization technique for high frequency rectifier in wireless power transfer (WPT). To overcome the drawbacks of traditional phase-locked method based on DSP controller in high frequency rectifier, a novel phase-locked loop combined with the chained trigger mode (PLL-CTM) is proposed. The reasons why the driver pulses lose have been disclosed in detail. Then, the problem of pulse losing can be solved based on PLL-CTM. Finally, a 500W WPT prototype is built to verify the validity of the proposed synchronization technique.
MULTISCALE HYDRODYNAMIC JOURNAL BEARING WITH ULTRA LOW SURFACE SEPARATION
Shaojin Shao,Yongbin Zhang,Long Chen,Xuedong Jiang 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.6
When the hydrodynamic journal bearing works under excessively heavy loads, there will be the mixed hydrodynamic regime. In the local area, due to the ultra low surface separation, there is only the physically adsorbed boundary layer lubrication; in the other areas, the hydrodynamic is multiscale contributed by both the adsorbed boundary layer non-continuum flows and the intermediate continuum fluid flow. The present study first gives different governing equations respectively for different flow regimes, and then derives the film pressure and carried load of the bearing. The calculations show that in the condition of ultra low surface clearances, the boundary adsorbed layer effect normally very significantly increases the film pressure and the load-carrying capacity of the bearing, and this increase can be more than 3 orders when the fluid-bearing surface interaction is strong.
Discrete Time Modeling of Wireless Power Transfer System Using LCC Compensation Topology
Xiufang Hu,Yue Wang,Shuangqing Lv,Xiaoshuai Dong,Tianjin Chen,Yongbin Jiang,Pengfan Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In recent years, wireless power transfer (WPT) technology has developed rapidly. However, conventional modeling methods for the dynamics of WPT suffer from the order increase problem and complicated derivations and expressions. In this paper, a discrete time modeling method is used for wireless power transfer systems which use magnetic resonant coupling. The proposed method aims on the dynamics of the overall WPT system, including the nonlinear inverter and rectifier. The orders of the developed models are lower than that of the generalized state space averaging method and the extended describing functions technique. Control to output voltage small-signal behaviors predicted by the discrete time model are verified by circuit simulation results.