IMPLEMENTATION OF WIRELESS POWER TRANSFER SYSTEM FOR SMART HOME APPLICATIONS
U.AISHWARYA, M.SOUNDARYA, R.MEENA
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
P.R.ENGINEERING COLLEGE
THANJAVUR,VALLAM.
IJTCSE Research /ISSN 2349–1582 conference publication
ABSTRACT:
Now a days, more and more wireless power transfer system are developed and being in used in many electronic devices especially in Smart Home applications. In this paper, we develop a basic and simple wireless electricity system to investigate and analysis the system performance. This system was developed using electrodynamic induction technique to demonstrate the wireless power transfer system. Moreover, this system is able to transfer power without a man-made conductor connected between power source and electrical load. A few experiments have been done to investigate the related parameters of the wireless electricity system. However, the results of experiments depict the important of number of turns of coils, distance between two transmitter and receiver coils and the diameter of both coils. Each of these parameters could affect the efficiency of the system. As a conclusion, a wireless electricity system was successfully developed for smart home applications.
INTRODUCTION:
Recently, electronic products occupy our daily lives, but also play a very important role. Wire connections between electronic products already are accustomed to everyone. Every day we use a variety of different electronics products, and we have noticed that wire connections could sometimes become troublesome and inconvenience to us. For example, the electronics devices used on table such as laptop, laptop itself has accounted for a corner of table, wire connections used up an area too, and it is messy and inconvenience when moving the laptop. Besides electronics devices, wire connections also bringing some problems to home appliances. example, the kettle is dangerous if the power cord contacted water, it could be threaten our life. The power cables we used in home appliances are usually dusty and could be beaten by rats. This situation could bring about circuit interruption in the house. Moreover, innovative or development of wireless electricity system is the ideal solution to overcome the trouble and inconvenience created by wire connection. Wireless electricity system could be design in several methods, in order to archive the specific needs above. The problem we facing are existing excessive wires at home, work place and schools. The wires take up too much space, get dirty easily, reduce the range of machine and it is a failure prone. It would be beneficial to multiple aspects of our economy and to our everyday live if we can develop a method of ireless electricity system. Many techniques have been proposed in previously published articles in order to implement the wireless power transfer such us Electrodynamics induction, Electrostatic induction, Microwave, and laser techniques.However, among the different techniques, induction coupled technique is considered the cost-effective approach for wireless power transfer. Although wireless power transfer could have been developed a lot earlier, there was never strong demand for it because of the lack of electronic products those days. A lot of research has been conducted wireless power transfer based Smart Home application but most of the researches have focused on a resonant transmitter and receiver pair to transfer power wirelessly. Resonant transmitter and receiver pair architecture has a highly efficient one to one coupling between the resonant transmitter and receiver. However, adding more receivers causes the efficiency of power transfer to deteriorate tremendously.
SYSTEM DESIGN:
The working principle of WPT is similar to the power transformer, but with some differences such as transformer have two coils placed very close to each other and usually each coil is wound on a ferrite material to increase the magnetic coupling but in case of WPT the core is the open air.The basic elements to achieve WPT are two, transmitter and receiver.The first one is to have a transmitter which requires circuits to convert the 50 Hz to the optimal WPT frequency to improve efficiency and reduce effects on human body, this frequency is below 10 MHz This transmitter is connected to a coil which generates a changing magnetic field.
The term “wireless charging” usually refers to inductive charging. This technology uses a charging station that creates an alternating magnetic field. A device with the proper induction coil will receive energy from that field when it is placed nearby, making it receive power without a physical connection. An important issue associated with all wireless power systems is limiting the exposure of people and other living things to potentially injurious electromagnetic fields. Wireless power transfer is the transmission of DC power from a power source to an electrical load, without the use of discrete human-made conductors. The Wireless Power Transfer and Charging Module can be used in electronic equipments in common use for close wireless charging. This module uses an electromagnetic field to transfer electric energy between a transmitter circuit and a receiver circuit.An induction coil creates an alternating electromagnetic field from within the transmitter circuit powered with 12V. The second induction coil takes power from the electromagnetic field and converts it back into DC current to the receiver circuit. Increase the number of turns of the receiver coil to increase the transmission distance, when low current is suitable in your application. As distance increase current capacity of receiver will drop.
3.PERFORMANCE ANALYSIS:
In this part, the details of the experimentdone will be discussed and output of the system will be analyzed. The transmitter and receiver circuits that have builtin previous section are used to implement the overall system with coils attached are shown in Figure 3.This experiment is conducted in the nearest distance between two coils, which mean the distance factor is negligible. The experiment is conducted to examine the relationship between the distance between two coils and voltage induced in secondary coils. The experiment started with the 1cm distance, both coil are placed coaxially. Since the diameters of both coils are same, this means not possibleto check the 0 distance between two coils. Every increment of 0.5cm changes the voltage induced in secondary coil. The size of the electronic devices is always the main concern in the gadget market. Small size of transmitterand receiver arepreferable for many people. In this section, the experiment ondiameter of coils was conducted to find out the most suitable combination. Several combinations of different size of coils were tested; the important most parameter is the induced voltage they can produce. The number of turns for both coils are constant, variation of diameters of the coils were selected. However, both coils are tested.
4. CONCULSION:
The convenience of wireless electricity system is been proved and seen by many manufacturers and consumers; the confident of users to this system has been established. However, this paper has been developed a basic and simple wireless electricity system to demonstrate how this system works. This system was developed using electrodynamic induction technique to demonstrate the wireless power transfer system. This system is able to transfer power without a man-made conductor connected between power source and electrical load. A few experiments have been done to discover the important parameters of the wireless electricity system. System parameters could affect the efficiency of the system. Parameters that stated in the system design should be considered when designing a wireless electricity system. As a conclusion, a wireless electricity system was successfully developed which can be implement in the next generation for Smart Home applications.
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