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针对在无线电能传输分析中多以磁耦合谐振技术为主,缺少对电谐振耦合机理的分析这一问题,文中根据对称性原理,提出无线电能传输机理中应该包含磁谐振耦合和电谐振耦合两种谐振耦合机理,并从电路的对偶性角度出发,给出了电谐振耦合电路模型并推导出传输功率增益的理论公式。通过对电路参数的分析得出了传输功率增益的变化规律,为无线电能传输系统的设计提供了参考。 相似文献
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随着科学技术的发展和进步,近些年来,无线电传输技术已经受到广泛的关注和应用。磁耦合谐振式无线电能传输是一种新型的无线电能传输方式,传输的距离为几十厘米,传输的效率高达85%以上。磁耦合谐振式无线电能传输技术集合多种学科技术,达到安全、高效和便捷的电能传输过程。本文通过对无线电能传输技术的介绍,对磁耦合谐共振式无线电能传输技术进行简述。 相似文献
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利用磁场在谐振线圈的共振耦合,磁耦合谐振式无线传能技术可以提供中等距离和功率的传输。当收发回路耦合系数较高且处于过耦合状态时,系统发生频率分裂现象,激励源频率成为制约传输功率的重要因素。由于收发线圈之间的距离具有随机性的特点,负载接收功率和额定功率难以恰好匹配。为了提高能量的传输功率及其稳定性,经过系统建模和理论分析发现,可以采用罗耶振荡电路对最大传输功率频点进行实时跟踪,基于反馈链路的功率控制也是实现功率匹配的有效手段。实验结果表明,采用罗耶振荡器和前端升压电路顺利完成无线传能系统的频率跟踪和功率控制,实现在12 cm距离内5 W功率的稳定传输,从而验证了能量传输过程中优化控制的有效性。 相似文献
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Selection of maximum power transfer region for resonant inductively coupled wireless charging system
In order to uphold the maximum power transfer in a resonant inductively coupled wireless power transfer system, an operating region has been proposed based on the coupling coefficient, frequency and electric load. The effectiveness of the proposed condition has been examined both theoretically and experimentally. The obtained results are in well agreement with each other. It has been seen that the operating frequency region is different for different electric loads corresponding to the coupling coefficient between the transmitter and receiver coils of the resonant inductive link. The operating frequency region shifts to lower frequency side for lower value of electric load at larger value of coupling coefficient even maintaining the optimum power transfer. The obtained knowledge reveals the design modus operandi through which an effective wireless charging system can be intended not only for low power device applications but also for high power EV charging. 相似文献
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Sabate J.A. Jovanovic M.M. Lee F.C. Gean R.T. 《Industrial Electronics, IEEE Transactions on》1995,42(1):63-71
The analysis and design of an LCC resonant inverter for a 20 kHz AC distributed power system are presented. Several resonant converter topologies are assessed to determine their suitability for high efficiency power conversion, under resistive and reactive loads. Two LCC-resonant inverter designs were implemented. One with all switches operating with zero voltage switching (ZVS), and another with two switches operating with ZVS and two switches with zero current switching (ZCS). The experimental results are presented along with a performance comparison of the two versions 相似文献
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在激光无线能量传输(LWPT)中,传能激光波长、光功率和光电池温度对光电池的输出特性有显著影响,最大功率跟踪(MPPT)技术可解决上述等因素造成的功率失配问题,提升系统的DC-DC效率。构建了针对LWPT的MPPT集成仿真系统,耦合了波长、光功率和温度对GaAs光电池输出特性的综合影响,可以同时分析光电池在功率匹配、功率失配和MPPT调制等多种条件下的输出特性。基于该仿真系统,研究了光电池在不同波长、光功率和温度条件下的物理规律。波长增大时,在850 nm左右转换效率ηmax达到最大值为50%,波长继续增大,光子能量小于GaAs禁带宽度导致ηmax迅速下降。功率增大时,ηmax基本不变,最大功率匹配电阻RLmax 减小。温度升高时,ηmax和RLmax均持续下降。此外,研究了光电池在功率失配时的输出特性,此时光电池的转换效率对比功率匹配时均有不同程度的下降。根据光电池的输出特性在仿真系统设计了MPPT电路,利用时间扰动算法进行最大功率跟踪。光电池在MPPT系统调制后均可工作在功率匹配时的最大功率点,且光电池能源利用率达到99.93%。研究结果对用于激光输能有重要指导意义。 相似文献
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MANFRED THUMM 《International Journal of Electronics》2013,100(6):1135-1153
Efficient plasma heating by ECR-wave irradiation requires axisymmetric, narrow, pencil-like millimetre wave beams with well-defined polarization. The linearly polarized gaussian-like HE11, mode satisfies these conditions best. This quasi-optical hybrid mode can be generated from TE0n gyrotron mode compositions by the two multi-step mode conversion processes: (1) ΣTE0n to TE01 to TE11 to HE11 or (2) ΣTE0n to TE01 to TM11 to HE11. The first scheme has the advantage that the converters can all be made without bends, allowing an arbitrary choice and fast change of the polarization plane. The second scheme does not exhibit this advantage, but it is more suitable at very high frequencies (e.g. 140GHz) because efficient TE01-to-TM11 transducers can be made considerably shorter than serpentine TE01-to-TE11 mode converters. This paper presents computations on mode converter systems of the first type at 70GHz and of both types at 140GHz (ID = 27 · 8 mm for 200kW transmission lines). The structure of wall perturbations (phase-matched superposition of 2 or 3 different geometrical periods) in the rippled wall mode converters and the curvature distribution in the bent, smooth-walled TE01-to-TM11 mode transducer were optimized by numerically solving the corresponding coupled-mode differential equations. Computer-aided optimization of circumferentially corrugated mode converters has been achieved with a scattering matrix code employing the modal field expansion technique (modular analysis concept (MAC)). In all cases the predicted overall efficiency of the complete mode converter system from ΣTE0n (predominantly TE02 at 70GHz or TE03 at 140GHz) to HE11 in the desired polarization is approximately 95% at 70GHz and 92% at 140GHz (ohmic attenuation is included). Low-power measurements on the conversion efficiency of the various mode transducers are in excellent agreement with the predicted values. High-power operation has been successfully demonstrated using a pulsed 70GHz gyrotron (200kW, 100ms). 相似文献
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Tanbir Ibne Anowar Surajit Das Barman Narendra Kumar 《International Journal of Electronics》2013,100(10):1607-1625
For magnetic resonant coupled wireless power transfer (WPT), the axial movement of near-field coupled coils adversely degrades the power transfer efficiency (PTE) of the system and often creates sub-resonance. This paper presents a tunable impedance matching technique based on optimum coupling tuning to enhance the efficiency of resonant coupled WPT system. The optimum power transfer model is analysed from equivalent circuit model via reflected load principle, and the adequate matching are achieved through the optimum tuning of coupling coefficients at both the transmitting and receiving end of the system. Both simulations and experiments are performed to evaluate the theoretical model of the proposed matching technique, and results in a PTE over 80% at close coil proximity without shifting the original resonant frequency. Compared to the fixed coupled WPT, the extracted efficiency shows 15.1% and 19.9% improvements at the centre-to-centre misalignment of 10 and 70 cm, respectively. Applying this technique, the extracted S21 parameter shows more than 10 dB improvements at both strong and weak couplings. Through the developed model, the optimum coupling tuning also significantly improves the performance over matching techniques using frequency tracking and tunable matching circuits. 相似文献
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This paper presents the design of capacitive wireless power transfer systems based on a Class-E inverter approach. The main reason for adopting the Class-E inverter approach is because of its high efficiency, theoretically 100%. However, the operation of a Class-E inverter is highly sensitive to its circuit’s parameters. In a typical capacitive wireless power transfer application, the capacitive coupling distance between plates is subject to changes, and hence its power transfer efficiency is greatly affected if the Class-E inverter is properly tuned. This drawback motivates us to develop an auto frequency tuning algorithm for a Class-E inverter which maintains its power transfer efficiency in spite of the variations of capacitive coupling distances between plates and circuit’s parameters. Finally, simulation and experiment are carried out to verify the effectiveness of the auto frequency tuning algorithm. 相似文献
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Investigating an LCL load resonant inverter for inductive power transfer applications 总被引:5,自引:0,他引:5
A inductor/capacitor/inductor load resonant inverter is investigated for inductive power transfer applications. The inverter uses a variable frequency controller and operates in discontinuous current mode. The steady state operation of this system is determined by a power flow balance between the inverter and the resonant tank. The results are used to design a system to achieve maximum power transfer. 相似文献
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Maximization of the output power in resonant frequency multipliers with ideal abrupt junction diodes
A general procedure is described to maximize the output power from a lossless abrupt-junction multi-idler varactor multiplier under resonant conditions. The approach is illustrated by several examples. It forms the basis of an iterative technique for optimizing the design of multipliers having lossy and nonabrupt junction varactors. 相似文献