kQ-product formula for multiple-transmitter inductive power transfer system

Abstract

This paper formulates the maximum efficiency of multiple-transmitter inductive power transfer system in terms of system kQ-product. We show that the cross-coupling among transmitters does not affect the maximum efficiency. More importantly, the square of system kQ-product is equal to the sum of squares of kQ-products of individual transmitter-receiver links. This result provides an intuitive insight into the characteristics of system efficiency.

Wireless power transmission for multi-degree-of-freedom motor applications based on magnetic field coupling

“…11 shows that when the three-coil receive system is located around the transmit coil, even if there is no difference between the receive coils, the energy, output power and transmission efficiency of the system are unevenly distributed to each receive coil due to directional problems. This paper [19] showed that the cross-coupling does not affect the maximum efficiency of multiple-transmitter IPT system. the system efficiency can be simply estimated by measuring the kQ-products of individual transmitter-receiver links.…”

“…The frequency conditions for maximum efficiency and power transfer under such couplings are proposed [15,16]. The interesting considerations based on kQ and Q are also given to the magnetic coupled resonance WPT system [17,18,19]. This paper presents a detailed circuit analysis of a two-coil inductively coupled WPT model in different compensating topologies to accomplish efficient energy transfer [20].…”

Study on impedance matching and maximum wireless power transfer efficiency of circuits with resonant coupling based on simplified <i>S</i>-matrix

“…An optimization method for output power and transmission efficiency is proposed [15]. The interesting considerations based on kQ and Q are also given to the magnetic coupled resonance WPT system [16,17,18]. In this manuscript, the impedance matching and the maximum power transfer efficiency of a pair of RLC circuits with resonant coupling are analytically derived based on the simplified S-matrix.…”

Power transfer efficiency formulation for reciprocal and non-reciprocal linear passive two-port systems

“…These laws fully characterize the relationship between the maximum power transfer efficiency and the port parameter matrix. In recent progress, Duong and Okada presented a theory for power transfer systems to solve a problem involving more than two ports [8]. This was a major step for the possible application deployment of wireless power.…”

“…We notice, however, that all those theories seen in Refs. [1,2,3,4,5,6,7,8,9,10] assume reciprocity between the two ports, namely Z 12 ¼ Z 21 . Indeed reciprocity makes the resultant formulas simple and easy to remember, it still confines the versatility of the theory.…”