Effects of parallel load-side compensation in wireless power transfer

Abstract

High reliability and ever increasing cost-effectiveness of power electronics components and digital processors have resulted in high interests in inductive power transfer techniques. The interest is directed mostly at electric and hybrid passenger car battery charging, although the first solutions have already been conceptualized and turned into homologated products for much higher power levels for bus and light rail vehicles. Transformers used for automotive applications have a large air gap and relatively low coupling coefficients. High levels of output power require tuning techniques in order to eliminate or decrease the associated reactive power. In this paper a parallel load side compensation technique and its consequences are described. The analysis is done by utilizing a novel method based on Boucherot Bridge model for the wireless power transformer. The analytical results are confirmed by circuit simulation using the transformer parameters derived from finite element electromagnetic analysis.

Boucherot Bridge based zero reactive power inductive power transfer topologies with a single phase transformer

“…Also the compensation provides a voltage source behaviour where the output voltage is a constant, independent of the load value, as given in (8). Following (7) from [14]:…”

Transfer properties of various compensation techniques for wireless power transfer system including parasitic effects

“…The circuit now features significant frequency selectivity which allows us to consider only the fundamental harmonics of the power supply voltage. The literature (Wang et al ., 2005; Huang et al ., 2016; Zhang and Mi, 2016; Woronowicz et al ., 2015; Li et al ., 2015; Feliziani et al ., 2015; Jabri et al ., 2014; Fu et al ., 2015; Xuezhe et al ., 2014; Zhou et al ., 2016), in general, covers four usual compensation topologies classified as series–series, parallel–parallel, series–parallel and parallel–series compensation.…”

A general approach to tuning of a dual secondary winding transformer for inductive power transfer

“…For higher power applications, such as for heavy duty vehicles such as light rail vehicles and buses using three phase IPT transformers provides advantages of higher power density, minimum power pulsation, lower ripple on the DC output [12], and much smaller unwanted radiation out of the vehicle, which is highly regulated [13,14]. By increasing urbanization and higher demand for light rails, IPT has significant benefits such as elimination of overhead lines and their difficulties, and no point-of-use C02 emission [15][16][17][18][19][20].…”