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Edit Comment Close Premium member Presentation Transcript Wireless Power Transmission: Wireless Power Transmission SUBMITTED BY:- Lakshit Nagar (EP/024) Greev Singh (EP/020) Utsav Mehra (EP/051) Kumar Gaurav (EP/023)Overview: Overview What is wireless power transmission(WPT)? Why is WPT? History of WPT Types of WPT Advantages and disadvantages Application ConclusionWhat is WPT?: What is WPT? The transmission of energy from one place to another without using wires. Conventional energy transfer is using wires. The wireless transmission is made possible by using various technologies .Why not wires?: Why not wires? As per studies, most electrical energy is transfer is through wires. Most of the energy loss is during transmission. On an average more than 30%. In India, it exceed 40%.Why WPT?: Why WPT? Reliable Efficient Fast Low maintenance cost Can be used for short range and long rangeHistory: History Nikola Tesla in late 1890’s Pioneer of induction techniques His vision for “world wireless system” The 187 feet tower to broadcast energyHistory: History All people can have access to free energy Due to shortage of funds, tower did not operateWardenclyffe: Wardenclyffe 1899, able to light lamps over 25 miles away without using wires The idea of tesla taken into research after 100 years by a team led by Martin Sol-ya-jic from MITTypes and Technologies of WPT: Types and Technologies of WPT Near-field techniques - Induction coupling - Resonant Induction coupling - Air ionisationTypes and Technologies of WPT: Types and Technologies of WPT Far-field techniques - Microwave wave transmission(MPT) - LASER power transmissionInductive coupling: Inductive coupling Simplest form is a Transformer Primary and secondary coil are not connected with wires. The energy transfer is due to mutual indution.Inductive coupling (cont..): Inductive coupling (cont..) Wireless charging pad(WCP), electric brushes are some examples. On WCP, devices are to be kept battery will be automatically charged. It is preferred because it is comfortable. Less use of wires Shock proof.Resonance Inductive coupling(RIC): Resonance Inductive coupling(RIC) Combination of inuctive coupling and resonance. Resonance makes two objects intreract very strongly.How Resonance in RIC: How Resonance in RIC Coil provides induction Capacitor is connected in parallel to the coil Energy will be shifting back & forth b/w magnetic field surrounding the coil and electric field around the capacitor. Radiation loss will be negligible.An example: An exampleWiTricity: WiTricity Simply Wireless Electricity Based on RIC Led by MIT’s Martin Sol-ya-jic Energy transfer wirelessly for a distance just more than 2m. Coils were in helical shape. No capacitors were used. Efficiency achieved was around 40%WiTricity… Some statistics: WiTricity… Some statistics Used frequencies are 1MHz and 20MHz. At 1MHz field strength wre safe for human and, At 10MHz it is dangerous, more than ICNIRP standards.WiTricity now..: WiTricity now.. No more helical coils. Companies like Intel are also working on devices that make use of RIC. Researches for decreasing the field strength. Researches to increase range.RIC Vs. Inductive coupling: RIC Vs. Inductive coupling RIC is highly efficient Ric has much greater range than Inductive coupling. RIC is directional when compared to Inductive coupling. RIC can be one to many, but Inductive coupling is one to one. Devices using RIC technique are highly portable.Air Ionisation: Air Ionisation It is a toughest technique under near-field energy transfer. Air ionizes only when there is a high field. Needed field is 2.11MV/m. Natural example : Lightening Not feasible for practical impletation.Advantages of near field techniques: Advantages of near field techniques No wires No E-waste Need for battery is eliminated Efficient energy transfer using RIC Harmless if field strength under safety level Maintenance cost is lessDisadvantages: Disadvantages Distance constraint. Field strength have to be under safety level Initial cost is high In RIC, tuning is difficult High frequency signals must be the supply Air ionisation technique is not feasibleFar-field energy transfer: Far-field energy transfer Radiative Needs line-of-sight. LASER or microwave. Aims at high power transfer. Tesla’s tower was build for this.Microwave power transmission (MPT): Microwave power transmission (MPT) Transfers high power from one place to another, which is far apart and usually at line-of sight. Steps: - Electrical energy into microwave energy - Capturing microwave using rectenna - Microwave energy into electricalMPT (contd…): MPT (contd…) AC can not be directly converted to microwave AC is converted to DC first DC is converted to microwave using megnetron Transmitted waves are received at rectenna which rectifies, gives DC as output. DC is converted back to ACLASER transmission: LASER transmission LASER is highly directional and coherent Not disperse for very long But gets attenuated when it propagates through atmosphere Simple reciever is photovoltaic cell Cost-effcientLASER Vs. MPT: LASER Vs. MPT When LASER is used antenna sizes can be much smaller Microwave can face interference LASER has high attenuation loss and also it get diffracted by atmospheric particles easilyAdvantages of far-field energy transfer: Advantages of far-field energy transfer Efficient Easy Low maintenance cost More effective when transmitting and receiving point are along a line-of-sight Can reach the places which are remoteDisadvantages of far-field energy transfer: Disadvantages of far-field energy transfer Radiative Needs line-of-site Initial cost is high When LASERs is used, - Conversion is ineffcient - Absorption loss is high When microwaves are used - Interference may arise - FRIED BIRD effectApplications: Applications Near-field energy transfer - Electric automobile charging (static or moving) - Consumer electronics - Industrial purposes Far-field energy transfer - Solar power satellite (SPS) - Energy to remote areas - Can broadcast energy globally in futureConclusion: Conclusion Transmission without wires - a reality Efficient Low maintenance cost , but high initial cost Better than conventional wired transfer Energy crisis can be decreases Low loss In future, world will be completely wireless. 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