WIRELESS POWER FOR DC FAN

               WIRELESS  POWER  FOR  DC FAN

   This project is done by KSRM college of engineering, Kadapa members are

   1. 149Y1A0288        Y.B MALI REDDY
   2. 159Y5A0209 G.DINA KIRAN REDDY                                 
   3. 159Y5A0215        K.ANANDA REDDY                            
   4. 159Y5A0224        P.MAHEDRA KUMAR

Project Guide:

M.BALAJI  (M.Tech),

Asst. Professor,

Department of EEE

K.S.R.M.C.E

The main objective of this project is to develop a system for wireless power transfer for medical applications. Pace Makers have become so popular for its size and flexibility that it had become a lifeline for heart patients. A pacemaker is an electronic device (that works in place of a defective heart valve) which is implanted in a patient body that runs on a battery. The patient is required to undergo surgery every year to replace the battery. This project is designed to charge a rechargeable battery of the pacemaker wirelessly, thus avoiding the need for a surgery every year.
                                                                                                                         This project is formed out of AC 230V 50Hz to AC 12V at 26 KHz circuit. The AC 50 Hz is rectified by bridge rectifier BR1and the DC derived from the rectifier is again converted to AC by an inverter, which is formed out of MOSFET, by switching the MOSFET at 26 KHz by using 555 timer which is fed to a coil acting as the primary of an air core transformer, the secondary of which is fed to a second rectifier to drive a DC load. The air core transformer operating at 26 KHz is the main concept for wireless power transfer as one cannot transfer 50 Hz AC power by air core.
                                                                                                   The secondary coil develops a voltage of 26 KHz at 12volt while it is kept over the primary coil where the air is used as the core. The output of the secondary is given to a high-frequency bridge rectifier that delivers DC which is then regulated to maintain a constant charging current to a NiCd (Nickel Cadmium) rechargeable battery. However, the overall efficiency of the power transfer is less than 50% for all weakly coupled series resonators. Resonators with a Q of 1,000 should be able to send power over a distance 9 times the radius of the devices with an efficiency of 10%. Normally these batteries have a long life of 7 years. Thus the patient’s operation time can be deferred to each 7 years after for replacement of the battery as the charging can be done for 7 years externally. But in the project, a DC fan motor is provided in place of a battery charging arrangement for better visibility.
The power supply consists of a step-down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the 555 timer and other components.


BLOCK DIAGRAM

          

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