Abstract
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 charging 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 profiles. In this paper, the proposed wireless battery charging system is implemented and the feasibility is verified experimentally according to constant-current constant-voltage charging profile or multi-step current charging profile.
Highlights
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 discarded as E-waste due to contact failures such as broken wires or short-circuit problems, etc
In the proposed wireless battery charging system, the current source characteristic of series compensated wireless power transfer (SS-wireless power transfer (WPT)) system is used on the CC phase and only the voltage feedback loop is required on the CV phase
In the proposed wireless battery charging system, this mechanism can be implemented by stepping down the output voltage of AC-DC converter in turn according to the MCC charging profile
Summary
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. The wireless battery charging system needs a WPT system that consists of a power transmitter and a power receiver. From Equation (7), the battery charging current, Ich of the SS-WPT system in Figure 3 can be described with the input voltage VIN as follows: Ich =.
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