(PDF) an Improved Wireless Battery Charging System

This paper presents a direct wireless battery charging system. The output current of the

series-series compensated wireless power transfer (SS-WPT) system is used as a current source,

and the output voltage of AC-DC converter controls the current source. Therefore, the proposed

wireless battery charging system needs no battery charging circuit to carry out char ging profiles,

and can solve space constraints and thermal problems in many battery applications. In addition, the

proposed wireless battery charging system can implement easily most other charging pr ofiles. In this

paper, the pr oposed wireless battery charging system is implemented and the feasibility is verified

experimentally according to constant-current constant-voltage charging profile or multi-st ep current

The use of portable electronic devices and electric vehicles has become more widespread recently ,

the many electronic devices and electronic vehicles are plugged into wall outlets via power cables

for many hours a day , and the use of wired charging apparatuses has become a part of daily life.

In this scenario, a large number of wire-chargers are discar ded as E (electronics)-waste due to contact

failures such as broken wires or short-circuit pr oblems, etc. Due to the increasing E (electronic)-waste

problem, there has been increasing interest in the study and development of wir eless power transfer

(WPT) technology that can be utilized to transfer power to batteries without requiring expensive

and the ability to operate even in extreme environments [

charging system needs a WPT system that consists of a power transmitter and a power receiver .

An exclusive controller is also required to regulate the output of WPT system since the power

transferred to the receiver of WPT system is not regulated whenever the load changes. The inverter

or converter in power electronics is usually controlled by three methods; pulse width modulation

(PWM), frequency modulation (FM), and amplitude modulation (AM). The AM method requires

an additional stage for the DC-DC converter in order to control the amplitude of the input voltage.

On the other hand, both PWM and FM need no additional stage since the inverter or converter uses

power semiconductor switches for the power conversion. For this reason, when PWM or FM is

applied to the power transmitter of a WPT system, the power transferred to the receiver can be easily

regulated. Nevertheless, high current stress and large power loss are generated since the voltage and

current in the power transmitter are not in phase. Due to this problem, regulation circuits such as

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