Resonant circuit topology Comparison and CC / CV Characteristic Evaluation Considering the Difference in Power Supply in Capacitive Wireless Power Transfer circuits

2021 ◽  
Author(s):  
Shunya Kuroda ◽  
Takehiro Imura
Keyword(s):  
Power Supply ◽  
Wireless Power Transfer ◽  
Resonant Circuit ◽  
Power Transfer ◽  
Wireless Power ◽  
Circuit Topology ◽  
The Difference

scholarly journals The Interaction between Load Circuits and Decision of Frequency for Efficient Wireless Power Transfer

2018 ◽  
Vol 8 (3) ◽  
pp. 1331
Author(s):  
Kazuya Yamaguchi
Keyword(s):  
Power Supply ◽  
Natural Frequencies ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Ac Power ◽  
Wireless Power Transfer System ◽  
Efficient Transfer ◽  
The Ideal

<pre>This paper derives an expression of efficiency of wireless power transfer on a situation that there are two devices towards one AC power supply. The interaction between a power supply and load is paid attention on a conventional wireless power transfer system, in contrast, the interaction between loads must be taken account of on the situation too. This is attributed to a possibility that a load disturbs the energy transmitted from a power supply to another load. Moreover each load needs different frequency of power supply for the ideal transfer since they have different natural frequencies on many situations. This paper models a circumstance that there are a power supply and two loads with a state space equation, and proposes how to decide a frequency of power supply to realize efficient transfer for each load.</pre>

Using Square Wave Input for Wireless Power Transfer

2016 ◽  
Vol 6 (1) ◽  
pp. 431 ◽  
Author(s):  
Kazuya Yamaguchi ◽  
Takuya Hirata ◽  
Ichijo Hodaka
Keyword(s):  
Resonant Frequency ◽  
High Power ◽  
Power Supply ◽  
Wireless Power Transfer ◽  
Wave Form ◽  
Power Transfer ◽  
Wireless Power ◽  
Sinusoidal Wave ◽  
Square Wave ◽  
Ac Power

A wireless power transfer (WPT) circuit is composed of a transmitting circuit with an AC power supply and a receiving circuit with a load, and the circuits are wirelessly connected each other. Then a designer chooses the wave form of the AC power supply. Many papers about WPT adopt a sinusoidal wave as the input. The frequency of the sinusoidal wave is generally determined to the resonant frequency of the circuit for high power transfer. Since the number of circuit elements in the power supply to generate a square wave is much less than that of a sinusoidal wave, WPT with a square wave input should be treated. In fact, some papers about WPT adopt a square wave as the input, and adjust the frequency of the square wave to the resonant frequency of the circuit. In this paper, we examine how the frequency of a square wave input affects power and efficiency of WPT circuits, and propose a procedure how to determine the frequency of the input to improve power and efficiency. Finally we discuss which wave should be adopted as an input and how the frequency of the input should be determined, regardless of whether resonant phenomena occur or not.

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