Kai He

Design of a Wireless Power Transfer System Based on Multi-Objective Particle Swarm Optimization

Huanjun Niu, Fei Gao, Kai He, Zhenghao Wang

Wireless power transfer (WPT) is an innovative technology that has gained significant attention in recent years. These challenges are particularly pronounced in dual-side LCC-compensated WPT systems, where the complexity of their resonant networks renders parameters like capacitors and inductors exceptionally sensitive to …

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Full-Mode Synchronous ZVS Modulation of the Cascaded Systems With Two Time Scales

Kai He, Huanjun Niu, Zhenghao Wang, Siwen Ye et autres

The front-end converter of inductive power transfer (IPT) systems typically requires a cascaded four-switch buck-boost (FSBB) converter to interface with distributed power sources at different voltage levels. However, different operating frequencies and non-fully-decoupled operation of the two-stage system pose challenges for implementing …

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Dynamic Multi-Time-Scale Energy Model of Cascaded System Considering Power Interaction

Kai He, Fei Gao, Ying Jiang, Xijun Yang

The dc-dc cascaded system is a typical structure in dc distribution systems. However, the differences in operating frequencies among various stages and the incomplete decoupling of bus capacitors can lead to the coexistence of multiple-time-scale variables within the same system, rendering traditional …

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Unified Modeling and Full-Mode Energy Control of Two-Time-Scale Cascaded Systems

Kai He, Fei Gao, Ying Jiang, Xijun Yang

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Unified Two-Time-Scale Modeling and Hybrid ZVS Modulation of LCC–LCC Compensated IPT System With Wide Input Voltage Range

Kai He, Fei Gao, Xin Liu, Ying Jiang et autres

The operating frequencies of the dc-dc converter connected to the distributed energy resources and inductive power transfer (IPT) system are often different, which makes it difficult to model the cascaded system accurately by using a single time scale. In this article, a …

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Accurate Discrete-Time Modeling and Boundary Analysis for High-Order Wireless Power Transfer Systems

Kai He, Xin Liu, Fei Gao, Xijun Yang et autres

The traditional stroboscopic mapping (SM) only focuses on the behaviors in periodic time instants, which will lose the details of multiple state changes during an operating period and cannot be used to analyze the characteristics of the studied system accurately. In this …

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Constant Voltage Charging of IPT System under Various Coupling Coefficients and Load Conditions Based on Switched-Controlled Capacitor

Huang Li, Fei Gao, Xin Liu, Huanjun Niu et autres

Constant voltage (CV) charging is an essential stage in battery charging within an inductive power transfer (IPT) system. However, most existing research primarily focuses on investigating CV output under various load conditions. When the coupling coefficient varies, the output voltage correspondingly fluctuates. …

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3D coverage optimization research on 5G massive MIMO antenna array

Feng Gao, Wen‐Yu Su, Runhong Shan, Wentao Zhu et autres

This paper analyzed the structure of 5G(5th generation mobile system) massive MIMO antenna array, and presented a 3D(three dimension) coverage optimization method. Integrating and optimizing two main plane patterns of the target 3D radiation pattern, the overall 3D beamforming and coverage optimization …

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TD-LTE Antenna Array Smart Cover Study

Feng Gao, Runhong Shan, Wentao Zhu, Kai He et autres

This paper integrated the antenna array analysis with difierential evolution algo- rithm to optimize weights of antenna ports e-ciently based on the customers' expected pattern, which could form the special broadcast beam to cover weak coverage cell. The broadcast beams were optimized …