ADVANCED WIRELESS POWER TRANSFER SYSTEM FOR E VEHICLE
Abstract : A detailed accumulation of the methods of wireless power transfer (WPT) including short range as well as mid range transmission . The technology and the science behind WPT and the future scope is discussed in detail. While a lot of research has been done on this topic in the previous decade, a large part of it is yet to be explored. The topics further discussed are the Roadway Powered Electric Vehicles (RPEVs) and the Online Electric Vehicles (OLEVs). These vehicles can revolutionise the transport system. But they require high initial investment. Further discussion on the Solar Power Satellite (SPS) which aims at transmitting the solar energy and using it for wireless power transmission is done. The attempts to commercialise the vehicles that use WPTs are going on with full force and we also discuss the advantages and the disadvantages for the same.
? To reduce the power converter VA rating, the primary side capacitor is usually tuned to make the input voltage and current in phase at certain coupling and load condition, which is called the zero-phase-angle (ZPA) method.
? But, when charging an EV battery wirelessly, there is a high-frequency magnetic field existing between the transmitting and receiving coils.
? The magnetic flux coupled between the two coils is the foundation for WPT, which cannot be shielded. The large air-gap between the two coils causes a high leakage field.
? In EV WPT system, for the high voltage on the power coils, isolation is required for the communication control circuit which may increase the cost.
? WPT methods uses the electromagnetic radiation for power transfer and the main effect of electromagnetic wave is its biological impact which harms human beings and animal.
? Biological impact of inductive coupling andresonance coupling is far less than compared to microwave power transmission technique
? There is also a limitation of separation distance and power capacity.
? Interference of microwave with other communication system.
? Initial cost is very high for implementing WPT system
• The IPT system has already been proposed and applied to various applications, such as underwater vehicles, mining systems, cordless robots in automation production lines, as well as the charging of electric vehicles.
• A flattened solenoid inductor form is proposed in. Because the flux goes through the ferrite like through a pipe, it is also called a fluxpipe coupler.
• To transfer power, the two pads are put closed with coil to coil. With the shielding layer, most of the high-frequency alternating magnetic flux can be confined in the space between the two pads.
• Depending on where the control action is applied, the control method could be classified as primary side control, secondary side control, and dual-side control.
? Electric vehicles (EVs) have environmental advantages and the capacity for advanced motion control. However, EVs need to be charged frequently due to their limited mileage per charge.
? Electric vehicles (EVs) have not only environmental advantages but also the capacity for advanced motion control.
? Their electric motors have the advantages of a faster and more accurate toque response over internal combustion engines.
? The transmitting efficiency and charging power are determined not only by the parameters of the transmitter and the receiver but also by the load.
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