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WIRELESS POWER TRANSMISSION
BY,
DHANSHA THAKUR ANIRUDH K.N GEETHU KRISHNAKUMAR JITHU NAIR

INTRODUCTION
? Wireless power transfer can make electronic devices like cell phones, household robots, mp3 players, laptop computers and other portable electronics wire-free. ? Resonant inductive coupling which is one of the various power transmission techniques is demonstrated here.

ABSTRACT
? Many researchers have developed several techniques for moving electricity over long distances without wires. ? Witricity is based upon coupled resonant objects. ? Two objects having same resonating frequency and in magnetic resonance tend to exchange energy, while dissipating relatively little energy to the extraneous off-resonant objects.

RESONANT INDUCTIVE COUPLING
? Inductive charging uses an electromagnetic field to transfer energy between two objects. ? Greater distances can be achieved by using resonant inductive coupling. ? Resonant inductive coupling or electrodynamic induction is the near field wireless transmission between two coils that are tuned to resonate at the same frequency.

RESONANT INDUCTIVE COUPLING

? The capacitor and inductor forms the resonator. Charge oscillates between inductor (as magnetic field) and capacitor (as electric field.) ? This type of oscillation is called resonance if the reactance's of the inductor and capacitor are equal.

RESONANT INDUCTIVE COUPLING
? Resonant transfer works by making a coil ring with an oscillating current. ? This generates an oscillating magnetic field. ? Because the coil is highly resonant any energy placed in the coil dies away relatively slowly over very many cycles. ? But if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away.

BLOCK DIAGRAM

BLOCK DIAGRAM
? Oscillator used is an astable multivibrator using 555timer which switches IRFP250 to produce oscillations in the primary coil. ? Secondary coil kept at a distance resonates at the same frequency and power transfer takes place. ? Signal received in the secondary is rectified and regulated.

CIRCUIT DIAGRAM

PRIMARY CIRCUIT

PRIMARY CIRCUIT
? Oscillator is an astable multivibrator using 555 timer a rectangular-wave generating circuit. ? A pot connected between the 6 and 7 terminals of the timer is adjusted to tune the primary and secondary coils at the same resonating frequency. ? The astable multivibrator causes an IRFP250 transistor to undergo switching to produce oscillations of required strength. ? A primary coil made of 8 turns of a magnetic wire is connected to IRFP250

SECONDARY CIRCUIT

SECONDARY CIRCUIT

PRIMARY PCB LAYOUT

PRIMARY COMPONENT LAYOUT

SECONDARY PCB LAYOUT

SECONDARY COMPONENT LAYOUT

APPLICATIONS
? Provides charging stations for handheld devices like phones ex:powermat, removes the need for multiple power sockets ? Can operate appliances like tv ? Electric car manufacturers consider it for charging electric cars, currently using wires for this purpose is not entirely practical

ADVANTAGES
? Non-radiative energy transfer is safe for people and animals. ? Wastage of power is less. ? Highly resonant strong coupling provides high efficiency over distance. ? Does not interfere with radio waves.

CONCLUSION
? Wireless power transfer is quickly becoming a viable reality. ? This technology offers an extremely efficient alternative to previous attempts at providing wireless power. ? Future improvements in wireless technology offer world changing implications.


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