Simultaneous Wireless Power/Data Transfer for Electric Vehicle Charging
Abstract
The major drawback of the battery charging in traditional electric vehicles is the use of plug-in charging devices. The aim of this paper is to propose a wireless battery charging method, in addition to power transfer, data related to battery status, vehicle ID code, or emergency messages can be simultaneously transferred between the grid and vehicle. This work applies inductive power transfer (IPT) to complete the charging system. The proposed control system can monitor the operating status on the secondary (vehicle) side in real time and adjust charging current depending on the battery status. Furthermore, the proposed mechanism is able to make an immediate stop, if there is any contingency, such as overcharging voltage or current. This will be beneficial to efficient and safety concern during the charging process.
EXISTING SYSTEM:
a novel s yst em i s prresented wi the wir el ess power and bidirectional data transmission using multiple carriers in a single inductive link. The structure of this system has several advantages such as only one coil is needed, power and data transfer is independent with each other and that can be utilized to estimate the distance of the two coils. However, it is not suitable for the communication in low-power IPT system with high-frequency carrier. In , this paper proposes to realize the parallel transmission of power and bidirectional data via the shared channel. That have good S/N ratio and the interference from data to power transfer can be limited. However, this method need costly to construct some of filter to filter data carrier wave. For safety concern, it is necessary to monitor the battery status while conducting power transfer from the primary side to the secondary unit (i.e. the receiving side). The work presented here proposes a new contactless power and information transmission scheme using a flyback converter which can completely operate under the method of zero-voltage switching (ZVS) to enhance power transfer efficiency and reduce EMI noise. The ZVS can be changed according to the loading condition. Furthermore, it can adjust the period of carry wave automatically. By using the ZVS, the secondary unit can adjust instantaneously the load current and deliver data to the primary unit.
PROPOSED SYSTEM:
The proposed IPT system in used contactless technology to transfer power and information; it was realized in a drill machine, which has two sets of coils for power and data transmission respectively. The system includes two operational frequencies which may result in relatively higher cost in the product. The primary design shown in this work intends to demonstrate the structure of this efficient power/data transmission system which possesses the potential to be used with the vehicle positioning system serving as a wireless vehicle charge station. In addition to the vehicle positioning system for locating the optimal parking location for energy transmission, useful data for communication can involve battery status, vehicle’s ID, emergency message and a variety of information for miscellaneous applications. This reveals significant potentials and flexibilities in future applications. This paper focuses on the presentation of simultaneous power/data transmission, design of the positioning system will come in another publication.
CONCLUSION
This work proposes a prototype simultaneous wireless power/data transfer for electric vehicle charging solutions. The proposed system possesses the following advantages: 1) the design is practical. The controller at the primary side can control and adjust the output current to achieve steady-state compensation at the secondary side via wireless communication. 2) The proposed system improves the security during energy charge. When an emergency contingency appears at the secondary side, the system can inform the primary side with the highest priority channel within 1/120 sec. 3) The contactless charging and discharging technology is to be used for energy exchange between car batteries and apartment complex’s energy storage tank (V2G and G2V). The excessive energy stored in the vehicle battery could be transferred to the apartment complex’s energy storage tank, and vice versa, via contactless energy transfer technique.In addition to power transfer, data related to battery status, vehicle status or ID code, etc. can be simultaneously transferred between the grid and vehicle in a compact scheme in real time. Experimental verification has been successfully conducted to verify applicability of the proposed design .
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