Angular expression of maximum power transfer efficiency in reciprocal two-port systems
Angular expression of maximum power transfer efficiency in reciprocal two-port systems
复制标题
互易二端口系统中最大功率传输效率的角度表达式
DOI：
10.1109/wpt.2014.6839568
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. Ohira
中科院分区：
文献类型：
--
作者：
T. Ohira
本文给出了一般互易二端口系统最大功率传输效率的新公式。考虑由具有有限可用功率的电源激励的无线功率传输系统的任意方案。然后，我们将效率定义为负载-源功率比。接下来，我们将其转化为导抗矩阵域采用网络端口参数。为了最大限度地提高效率，我们施加的同时共轭条件上的源和负载阻抗。通过引入一个新的角量，我们最终得到了最大效率的一个简洁的表达式。它的正切平方起着功率效率指标的作用，而它的双角正切则是传统k-Q积的一般推广。人们甚至可以在学习共振或相互耦合这个词之前，就把这个角度作为一个清晰的设计领航。该理论使无线系统工程师能够广泛探索各种功率传输机制的可行性，而不仅仅是两个线圈之间的磁耦合。
This paper presents a novel formula of maximum power transfer efficiency for general reciprocal two-port systems. Considering an arbitrary scheme of wireless power transfer system excited by a power source with finite available power. Then we define the efficiency as load-to-source power ratio. Next we translate it into the immittance matrix domain employing the network port parameters. To maximize the efficiency, we impose the simultaneous conjugate conditions upon the source and load impedances. We finally reach an elegant expression of maximum efficiency by heuristically introducing a new angular quantity. Its tangent square plays the role of power efficiency index, while its double-angle tangent works as a general extension of conventional k-Q product. One can use the angle as a lucid design pilotage even before learning a word of resonance or mutual coupling. This theory enables wireless system engineers to widely explore the feasibility over various kinds of power transfer regimes rather than just magnetic coupling between two coils.