Design of wireless power transfer system with inputfilter

Abstract

For power electronic systems, adding filters to eliminate harmonic interference is a general and effective method, but the position and parameters of filters in wireless power transmission (WPT) system will greatly affect the system characteristics of WPT. The main reason for the harmonic interference in WPT is that the harmonics in the output square wave are loaded on the resonant coil of the transmitter, so in this study, a method of harmonic elimination by adding a second-order LCR filter to the resonant part (LCR-WPT) is studied. However, the WPT resonant part is precisely matched and designed; if a filter is added at the resonant part, it inevitably affects the resonance state, system output power and efficiency of the WPT. To ensure that the LCR-WPT has good system characteristics, this study analyses the mathematical model of the LCR-WPT and deduces a design method for the filter and an efficiency optimisation formula. This study also introduces LCR-WPT applications in two different control schemes. The experimental results show that the harmonic interference of the system is significantly attenuated after the filter is added; additionally, the efficiency of the system decreases by <10%, and the system still maintains sufficient output power.

Optimal C-type filter design for wireless power transfer system by using support vector machines

“…( 6) that the energy of harmonic transmission decreases since the k decreases. However, when the k is chosen around 0.9, maximum harmonic transmission ratio is observed [21]. It is also proven that when the harmonic-related reactive power accumulation increases, efficiency of the inverterdriven WPT system decreases.…”

“…( 5) that UTX includes harmonics. According to the harmonic analysis of WPT system given in [21], despite the harmonic current is reduced effectively by adjusting Q value of the resonant circuit, in some cases, harmonic current required to be reduced. So, the balance between Q value and harmonic voltage loaded on the transmitter coil should be adjusted accurately.…”

Simultaneous Wireless Power and Data Transfer for Electric Vehicle Charging: A Review

“…It should be noted that, in systems such as those proposed in [100], a multiple output can be achieved through an intermediate unit that uses the same compensation system as the primary and secondary circuit, in order to realise a second power transmission. We should also mention that LCC compensation can be used as a filter for the inverter's square signal output, as proposed in [128].…”

Collaborative Optimization Method of Power and Efficiency for LCC-S Wireless Power Transmission System

“…In reference [16], the constant current (CC) and constant voltage (CV) charging strategies based on phase shift control of a controllable rectifier circuit and efficiency optimization strategy based on dynamic equivalent impedance matching are proposed, which can improve the WPT system transmission efficiency while realizing CC and CV charging. References [17,18] improve the performance of the system by optimizing the structure of the system. In reference [17], a method of harmonic elimination by adding a second-order liquidity coverage ratio (LCR) filter to the resonant part is studied to improve the output power and efficiency of the system.…”

“…References [17,18] improve the performance of the system by optimizing the structure of the system. In reference [17], a method of harmonic elimination by adding a second-order liquidity coverage ratio (LCR) filter to the resonant part is studied to improve the output power and efficiency of the system. In reference [18], the primary compensation capacitance is well designed to regulate the transfer power fluctuation in the WPT system.…”