Adjustable coupler for inductive contactless power transfer system to improve lateral misalignment tolerance

Improvement of power transfer efficiency of hexagonal coil arrays in misalignment conditions

“…The design of the system consists of two parts: the transmitter circuit or the primary circuit consisting of a DC power supply unit, a 555 timer in a stable mode, a MOSFET, an LC primary resonance coil and a rectifier and a receiver circuit also called a secondary circuit which consists of secondary resonance coil, rectifier and load in the form [19]. The primary coil resonates at a frequency of about 22.2 kHz to transfer the induced voltage in the air [24].…”

“…Recent research with 7 array circle coil design for the transmitter and circle coil receiver can reduce load on EV without reducing the efficiency [2] shown in Figure 1. Misalignment in tangential boundary area causes a drop in efficiency [19]- [20]. The main issue in transfer efficiency due to misalignment and uncoupling between resonance primary coils/transmitter (Tx) with and secondary coil/receiver (Rx) [21].…”

Extending the horizontal transmission range of an inductive wireless power transfer system using passive elliptical resonators

“…Depending on the coil arrangement, planar pads are divided into two categories: single-layer and multi-layer pads. In singlelayer pads, most predominantly the source or transmitter coil(s) cover the entire surface of the horizontal field-extenders, actively energizing the whole area [10][11][12][13]. The traditional single-layer planar pad has been improved by introducing multilayer pads.…”

“…Consequently, multi-layer pads can provide higher magnetic fields. Multi-layer pads can be designed using single layer coils or by interconnecting multi-layered coils [9][10][11][12][13][14], which is a versatile and desirable feature. Multi-layer coils have been reported in [5,[15][16] and a novel approach based on a twolayer system is presented in [9] where the first layer coil can act as an active transmitter and the second layer as a staggered repeater coil system.…”

“…Generally, the work around planar pad design focuses on developing a robust planar pad by taking into account the general guidelines developed by researchers throughout the decades about coil design (e.g., indications such as: implementing a hollow approach [18], varying turn-widths for both single and multilayer coils [19], uneven pitches [20] etc.). Existing research focuses more on circular, rectangular and hexagonal coil designs for the development of planar pads [5][6][7][8][9][10][11][12][13][14][15][16][17]. In studies comparing these three coil designs, hexagonal coils exhibit a higher tolerance to misalignment than square coils [21] and circular coils can maintain a higher coupling for the same air-gap than rectangular coils of similar dimensions [22].…”