Resonant Compensation Network Research Articles

Load voltage study of LCC-S type wireless energy transmission system based on phase shift control

Abstract When the light load is applied in an LCC-S type wireless power transmission (WPT) system, the system does not have constant voltage characteristics, which affects the normal use of power equipment. If a DC/DC converter is used to regulate the voltage at both ends of the load to keep it constant, it will increase the size and cost of the system, and the efficiency is also reduced. For this reason, in this paper, phase-shift control is carried out based on the LCC-S type WPT system, and the LCC-S resonant compensation network is first modeled and analyzed in terms of its working principle. Then, the principle of phase-shift control is analyzed, the relationship between the drive signal phase-shift angle and the load voltage in the phase-shift control is deduced, and finally, a simulation model is built in Matlab/Simulink to verify the correctness of the control strategy.

A novel approach to modeling and experimenting a solar-fed H6 configuration for battery swapping stations in rural and commercial areas using a dual phase CLLC DC–DC resonant converter

In order to further the use of clean energy, the transition from internal combustion engine (ICE) vehicles to electric vehicles (EVs) was initiated globally. In the coming days, there will be a need for more EV charging stations in rural and commercial areas. The installation of new charging infrastructure for different vehicles with different voltage specifications in order to charge batteries are expensive with limited availability. Also fast charging is not possible in rural areas. To overcome this issue, the battery swapping station is a good option. In this paper, a new solar-powered dual-phase CLLC DC–DC resonant converter is proposed to test battery swapping. An equivalent circuit has been derived analytically, and the optimal design of the magnetic components for the proposed converter has been derived. Simulation has been carried out for the proposed system. The proposed system was tested with a prototype set-up of a 100 W lithium-ion battery bank of equal and unequal voltage levels in an open-loop condition using Analog Discovery-2. Introducing the H6 concept in the proposed converter has the features of low stress across switches, use of higher dc grid voltage, low switching losses due to the dual phase resonant compensation network, and a multi-port isolated output system. Apart from battery swapping applications it can be utilized for Energy Storage Solution [ESS].

Research on Three-Phase Wireless Power Transfer System

Aiming at the problems of low power, low energy transmission efficiency, and high stress in the circuit of a single-phase wireless power transfer system, this paper proposes a wireless power transfer (WPT) system with a three-phase angle difference of 120 degrees and establishes a COMSOL multi-physics simulation model for analysis. In this simulation model, the topology of the three-phase resonant compensation network is studied in detail, and the structure of the coupling coil is designed and adjusted. Compared with the single-phase system with the same environmental conditions, air gap, and operating frequency, the simulation results show that the proposed three-phase system can effectively reduce the magnetic flux leakage, reduce the stress in the circuit, and significantly improve the energy transmission efficiency. In order to verify the reliability of the simulation results, an experimental platform was built. The experimental results show that the efficiency and coupling degree of the new system are significantly improved at the resonant frequency of 47.5 kHz, and the stress in the circuit is also significantly reduced.

Passive array micro-magnetic stimulation device based on multi-carrier wireless flexible control for magnetic neuromodulation.

Objective.The passive micro-magnetic stimulation (µMS) devices typically consist of an external transmitting coil and a single internal micro-coil, which enables a point-to-point energy supply from the external coil to the internal coil and the realization of magnetic neuromodulation via wireless energy transmission. The internal array of micro coils can achieve multi-target stimulation without movement, which improves the focus and effectiveness of magnetic stimulations. However, achieving a free selection of an appropriate external coil to deliver energy to a particular internal array of micro-coils for multiple stimulation targets has been challenging. To address this challenge, this study uses a multi-carrier modulation technique to transmit the energy of the external coil.Approach.In this study, a theoretical model of a multi-carrier resonant compensation network for the arrayµMS is established based on the principle of magnetically coupled resonance. The resonant frequency coupling parameter corresponding to each micro-coil of the arrayµMS is determined, and the magnetic field interference between the external coil and its non-resonant micro-coils is eliminated. Therefore, an effective magnetic stimulation threshold for a micro-coil corresponding to the target is determined, and wireless free control of the internal micro-coil array is achieved by using an external transmitting coil.Main results.The passiveµMS array model is designed using a multi-carrier wireless modulation method, and its synergistic modulation of the magnetic stimulation of synaptic plasticity long-term potentiation in multiple hippocampal regions is investigated using hippocampal isolated brain slices.Significance.The results presented in this study could provide theoretical and experimental bases for implantable micro-magnetic device-targeted therapy, introducing an efficient method for diagnosis and treatment of neurological diseases and providing innovative ideas for in-depth application of micro-magnetic stimulation in the neuroscience field.

Research on Double LCC Compensation Network for Multi-Resonant Point Switching in Underwater Wireless Power Transfer System

This paper introduces a control method suitable for AUVs to transmit underwater radio energy that improves the stability of AUV charging under water based on double LCC compensation. The coupling coefficient decreases with the rise of the coil offset in the underwater wireless power transfer system, such that the power transmission capability is reduced. To solve the above-mentioned problem, a double LCC resonant compensation network impedance characteristic is proposed in this study through the analysis of the double LCC resonant compensation network. To be specific, the wireless power transmission method for multi-resonant point switching of the LCC compensation network is developed. The multiple resonance points of the developed method are not correlated with the load impedance in the double LCC resonance compensation network, and the multiple resonance points are consistent with the power transmission characteristics. Moreover, the appropriate resonance frequency is matched based on different coupling coefficients, and the multi-resonance points are switched to each other to increase the system’s transmission power and transmission efficiency. As revealed by the results of the simulation and experimental studies, the double LCC compensation network with multi-resonance point switching is capable of achieving the output characteristics of constant-voltage/constant-current of the wireless power transfer system, reducing the system current harmonics effectively, and enhancing the power transmission capability and anti-offset capability.

Analysis and design of four-plate capacitive wireless power transfer system for undersea applications

This paper presents a four-plate undersea capacitive wireless power transfer (CPT) system for underwater applications such as autonomous underwater vehicles (AUVs). Generally, a CPT system transfers the power based on electric fields. The complex resonant compensation networks are used to make the CPT system work in the resonant condition. The resonant voltage is always very high. It will be a big challenge to the human safety. In this paper, a virtual electrons periodic reciprocating flow theory is proposed for the CPT system. In one switching cycle, the electrons firstly flow in the forward direction through the forward path and then flow in the inverse direction through the inverse path. The CPT system has been deeply studied with the vacuum dielectric or the air dielectric. However, for the CPT system, there are few papers to show the underwater application. In this paper, an undersea four-plate CPT system is designed and studied in the underwater condition. The two coupling capacitors and other elements of the CPT system could build a closed-loop path. A small value inductor is adapted as a resonant compensation network for the four-plate CPT system. The DC voltage is inverted to the AC voltage in the primary side with the single-phase full-bridge inverter. The resonant voltage is rectified to the DC voltage in the secondary side with the single-phase full-bridge diode rectifier. A 100 W power level CPT system is constructed to verify the theory analysis and the calculation. The theory analysis is verified by the simulated and experimental results. The stable output voltage and load power are achieved in this paper.

Reliable [formula omitted] filtering for the SP resonant ICPT system with stochastic multiple sensor faults

The inductively coupled power transfer (ICPT) system is one of the most important system in the wireless power transfer field. In this paper, the reliable H∞ filtering problem is considered for the ICPT system based on the series–parallel (SP) resonant compensation network. A more general SP resonant ICPT system model is proposed with considering external disturbances and multiple sensor faults. The sensor faults are assumed to happen in a random way, which are described by a set of stochastic variables satisfying certain statistical features. The main purpose of the addressed problem is to design an H∞ filtering scheme such that the filtering error dynamics are asymptotically mean-square stability (AMSS). For this purpose, a generalized state-space averaging (GSSA) model is built to characterize dynamical behaviors of the SP resonant ICPT system first. Then the filtering-error system with stochastic sensor faults is established via the GSSA model. By virtue of an extended Lyapunov function, a sufficient condition is given to achieve the AMSS of the system and H∞ performance requirement. Subsequently, the H∞ filtering gains are obtained by solving a set of linear matrix inequalities. Finally, a simulation example is provided to verify the availability and reliability of the proposed filtering scheme.

Research and design of automatic alternation between constant‐current and constant‐voltage modes on the secondary side in wireless charging systems

During wireless charging, the constant-current (CC) mode must be quickly and stably changed to constant-voltage (CV) mode to ensure battery safety. This switch often requires communication between the primary side and the secondary side along with complex control methods on the primary side. The authors propose a method for automatically and rapidly switching from CC mode to CV mode by changing the resonant compensation network on the secondary side without requiring communication or any complex control processes. Additionally, a method for designing the parameters of the secondary side is presented to ensure battery voltage stability at the transition point. By examining two examples of revised circuitry for the different power levels needed in industry applications, the proposed design methods are analysed and verified, two sets of experiments with a 20 cm coil spacing are conducted, and two systems with output powers of 1 and 2.7 kW and average efficiencies of 90.8 and 93% are implemented. Experimental results show that as the load varies, the output current and voltage obtained using the proposed methods essentially remain constant. In addition, the process of changing from CC mode to CV mode is stable, which satisfies battery-charging requirements.

A Structure Parameter Design Method of DD Coils to Optimize Coupling Performance and Misalignment-tolerant Ability

Aiming at the problems of weak coupling performance and poor misalignment-tolerant ability of the magnetic coupling structure of electric vehicle wireless charging system, this paper proposes a coil structure parameter design method. This paper analyzes the relationship between the system characteristics and the coupling coefficient of the wireless charging system based on the dual LCC resonant compensation network. Then, based on the analysis of the structure parameters of DD coils, a structure parameter design method to optimize coupling performance and misalignment-tolerant ability is proposed. Finally, the ANSYS MAXWELL 3-D finite element model of the DD magnetic coupling structure is built, and the validity and feasibility of the proposed design method are verified by simulation. Under the design method of coil structure parameter in this paper, the magnetic coupling structure can achieve excellent coupling performance and misalignment-tolerant ability.

An Analysis and Optimization on Circuit Characteristics of Non-Contact Wireless Charging System for Electric Vehicles with the TS Resonant Network

The load characteristics of non-contact wireless charging system to electric vehicle are exploited in this paper to improve the output power and transmission efficiency of the system. Firstly, this paper makes a mathematical modeling for the TS-S wireless charging system based on Two-Port Network theory. Then, the features of constant voltage output, output power, and transmission efficiency are discussed later. The results show that TS resonant compensation network could improve the system’s output power, and transmission efficiency. After that, the system’s frequency and load resistance in the optimal working state are calculated. Finally, simulations and experimental results are presented to verify the correctness from theoretical derivations.

Design and Optimization of Inductive Wireless Power Transmission System

基于无线电能传输系统的要求，利用电磁场有限元分析软件Ansoft Maxwell，对三种典型结构的松耦合变压器磁芯及线圈绕组方式进行仿真分析，讨论初级侧和次级侧相对位置变化对其耦合系数的影响，设计一种高功率密度松耦合变压器。采用基于Simplorer软件系统场路耦合联合仿真的方法对设计的松耦合变压器及其谐振补偿网络进行仿真验证。最终搭建3.3 KW无线电能传输系统实验平台，验证该设计的可行性，系统整体传输效率最高达到95%。 Based on the requirement of wireless power transmission system, Ansoft Maxwell, a finite ele-ment analysis software of electromagnetic field, was used to simulate the magnetic core and coil winding of loosely coupled transformers with different structures. The influence of the relative position changes on the coupling coefficient was discussed. We design a High Power Density Loosely Coupled Transformer. The simulation of the loosely coupled transformer and its resonant compensation network is verified by the method of field-circuit coupled co-simulation based on Simplorer software system. Building 3.3 KW wireless power transmission system experimental platform to verify the feasibility of the design, the overall system transmission efficiency is up to 95%.

Investigation of a SP/S Resonant Compensation Network Based IPT System with Optimized Circular Pads for Electric Vehicles

Investigation of a SP/S Resonant Compensation Network Based IPT System with Optimized Circular Pads for Electric Vehicles

Double‐LCL resonant compensation network for electric vehicles wireless power transfer: experimental study and analysis

This study presents the experimental study and analysis of double-LCL resonant compensation network based wireless power transfer (WPT) system for electric vehicles. The WPT system could accomplish both constant current and the unity-power-factor for the transmitting terminal and the receiving terminal. In addition, the transmitting terminal inverter can achieve zero-voltage-switching. The multi-physical characteristics of the transmitting and receiving terminals based on LCL resonant compensation network are analysed in detail. Finally, three-dimensional finite element analysis and an experimental system with circular pads is setup to verify the theoretical analysis under different loads and horizontal/vertical misalignment conditions. At the condition of 200 mm gap and no horizontal misalignment, the system can supply the maximum output power of about 7.36 kW having the maximum efficiency of 95.87%.

The Resonance Compensation Circuit Research to Wireless Power Transfer System

This paper introduces the wireless power transfer system( WPT system ) of application prospect, introduces the WPT system of basic components, put forward the LC bridge type resonant compensation circuit topology structure, put forward the new modes to completely symmetrical resonant compensation network apply to the primary and secondary sides ; the simulation results show the effectiveness of the compensation circuits.