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Wirelesspowertransmission 120909130453-phpapp01
- 1. WIRELESS POWER TRANSMISSION BY, DHANSHA THAKUR ANIRUDH K.N GEETHU KRISHNAKUMAR JITHU NAIR
- 2. 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.
- 3. 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.
- 4. 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.
- 5. 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.
- 6. 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.
- 8. 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.
- 10. PRIMARY CIRCUIT
- 11. 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
- 18. 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
- 19. 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.
- 20. 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.