Wireless charging of mobile phones

Wireless Charging of Mobile Phones

Preview

• Introduction

• Components

• Functioning

• Advantages

• Limitations

INTRODUCTION

• The main objective of this is to make the recharging of mobile phones independent of there manufacturer and battery make.

• New reforms are now made and now reachargingcan be done when you are talking on the phone.

• This is done by the use of MICROWAVES• For the transmission of the waves special antennas

are used called SLOTTED wave guide antenna.• The whole system works at a frequency of 2.45 Ghz

Types

• Inductive charging

• Charging using microwaves

EM SPECTRUM

Components

• Microwaves

• Rectenna

• Sensor

• Filter

TRANSMITTER DESIGN

•Magnetron is high power is high power microwave oscillator and used in microwaves ovens and radar.

•Magnetron is capable to deliver more power than reflex klystron or gunn diode

•It is set to effect the path of travel of electrons that are in trasit from cathode to anode plate.

MAGNETRON

SLOTTED WAVE GUIDE ANTENNA

RECIVER

SENSOR CIRCUT

•Detects if phone receives any message signal.• Used to charge the phone while talking.• Thus on receiving a signal the sensor circuitry directs the rectenna circuit to on & mobile starts to charging.

RECTENNA

•A rectifying antenna is called rectenna •It converts the microwave power to the direct current (DC) power •The schottky diode microwave rectifying circuit has efficiency greater 90%

ADVANTAGES•Use of separate chargers eliminated•Electricity saved•Phone can be charged anywhere and anytime•One microwave transmitter can serve to all the service provider in that area

DISADVANTAGES

•Bulky•Heat generation

Inductive charging

• Induction chargers typically use an induction coil .

• The two induction coils in proximity combine to form an electrical transformer.

• Protected connections - no corrosion when the electronics are all enclosed

• Durability-significantly less wear and tear

ADVANTAGES

DISADVANTAGES

•Lower efficiency•waste heat

•slower charging

Thank you