Abstract — In this paper, a new wireless charging system for
movable telephone is addressed. A pair of contiguous printed-
circuit-board windings has different shape and structure
respectively, which is adopted as a wireless energy transfer device.
The structure and principle of wireless charging system are
expounded. The novel concept comes into being the basis for a
new generation of universal charging system for a wide range of
movable telephones. Multifarious movable telephones can be
charged simultaneously through the presented charging system,
despite their orientations and positions. Furthermore, the
feasibility of this system has been demonstrated with the practical
measurements. These results provide a useful example for a
practical charging system for movable telephone.
Index Terms — Wireless charging system, printed-circuit-
board (PCB) winding, different structure, coupling.
I. INTRODUCTION
The most common way to charge rechargeable battery of the
movable telephone is to use a traditional charger, which
connects power supply to the battery located in the movable
telephone. But this charging way has many disadvantages, e.g.,
battery charger occupies so much space that it is taken
inconveniently, and the charging contact of mobile-phone is
easy to be destroyed.
The inductive contact-less battery charging method which
uses a transformer principle has been proposed to be superior
to the conductive method from the stand point of safe treatment.
These inductive types of chargers, however, use the traditional
transformer designs with windings rounding ferrite magnetic
cores [1]-[3].
Furthermore, the inductive contact-less battery charging
method which uses a coreless PCB transformer principle has
been proposed [4]-[5]. These inductive chargers, however, use
coreless PCB transformer designs with the same shape and
structure windings. It brings about much energy loss in the
coupling between the primary winding and the second winding.
In this paper, the wireless charging system with a pair of
PCB windings of different shape and structure respectively is
studied. This new system provides higher efficiency for
Fig. 1. Schematic diagram of wireless charging system.
Fig. 2. (A) Primary and second winding coupling structure of coreless PCB
transformer. (B) Simplified symbol of the hexagonal spiral winding.
(C) Structure of the hexagonal spiral winding.
movable telephone. The proposed wireless charging system
allows more than one movable telephone to be charged
simultaneously, regardless of their orientations and positions
on the surface of the system. And this system is well suited for
the applications to movable telephone or other portable
electronic equipment, which is powered through rechargeable
battery.
A Novel Wireless Charging System for Movable
Telephone with Printed-circuit-board Windings
of Different Structure and Shape Respectively
Xiao Zhi Jian, Ha
n
Zhen Yu
Mechatronics Research Institute, College of Manufacturing Science and Technology,
Sichuan University, China
E-mail:baberLa@163.com
Proceeding of International Conference on Electrical Machines and Systems 2007, Oct. 8~11, Seoul, Korea
- 1283 -
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