Xi'an Jiaotong University

Min Wu

Laili Wang

Xu Yang

Yue Wang

Ruibang Li

Yonghui Liu

Yongbin Jiang

Yan Zhao Liu

Rui Zhang

Jiaqi Wang

Feifei Qi

Jing Sun

Le Ma

Zexian Zeng

Guoli Li

Chenxu Zhao

Liyun Kong

Lijuan Shi

Menglu Wu

A method for simultaneously determining fat-soluble vitamins and carotenoids in serum, and belonging to the technical field of analytical chemistry, includes an ionic liquid (IL) or a binary mixed solvent composed of an IL and another solvent is adopted as an extractant; the biological samples are pre-treated by liquid-liquid extraction (LLE) and then detected by high-performance liquid chromatography (HPLC); retinyl acetate and trans-&#x3b2;-apo-8'-carotenal are adopted as the internal standards for fat-soluble vitamins and carotenoids, respectively; and the internal standard method is adopted to establish standard curves for quantification based on the retention time and the UV-Vis absorption spectrum. Compared with the existing methods, in the disclosure, the pretreatment process is simple and easy to be conducted, the sample can be prepared in a short time, and the toxic and harmful organic solvent is used at a reduced amount.

Method for simultaneously determining fat-soluble vitamins and carotenoids in serum

A joint control method with variable ZVS angles for dynamic efficiency optimization in a WPC system for EVs under ZVS conditions, including: adjusting a phase-shift duty cycle of a secondary active rectifier to control a charging voltage and a charging current of EV's batteries through a charging voltage closed loop and a charging current closed loop, respectively; adjusting a power angle of the secondary active rectifier to control a ZVS angle of the secondary active rectifier through a secondary ZVS angle closed loop; adjusting a phase-shift duty cycle of a primary inverter to control a ZVS angle of the primary inverter through the primary ZVS angle closed loop; determining the current operating case of the WPC system and adjusting the ZVS angles of the primary inverter and the secondary active rectifier to automatically identify an optimal operating point with a maximum charging efficiency through the P&O method.

Joint control method with variable ZVS angles for dynamic efficiency optimization in wireless power charging for electric vehicles

The present invention discloses a current phase locking and driver pulse generation method for wireless charging for electric vehicles. By monitoring the resonant current iof the receiving coil, the proposed method generates the synchronization signal accurately based on the phase of the current i. Moreover, it controls the phases of driver pulses of switching transistors according to the synchronization signal so as to control the turn-on moment and turn-off moment of the switching transistors in the secondary rectifier. As a result, by using the proposed method, the pulse losing of the switching transistors in the secondary active rectifier can be avoided; the stable and reliable phase locking of the high-frequency resonant current and generation of driver pulses can be achieved; the anti-interference capability can be greatly enhanced, and the stability and reliability of the wireless charging system for electric vehicles can also be improved.

Current phase locking and driver pulse generation method used in wireless charging for electric vehicles

Growing community of inventors

Shaanxi, China

Min Wu