The Basics of Wireless Charging

Wireless charging transfers energy between two coils using electromagnetic induction—the same principle that powers electric motors and transformers.

How It Works

Step 1: Creating a Magnetic Field

The charging pad contains a transmitter coil. When electricity flows through this coil, it creates an oscillating magnetic field.

Step 2: Inducing Current

Your phone contains a receiver coil. When placed on the pad, the magnetic field induces an electric current in this coil.

Step 3: Converting to DC Power

The induced AC current is converted to DC power by a rectifier circuit, which then charges your battery.

Wireless Charging Standards

Why Wireless Charging is Slower

Energy loss occurs during wireless transfer:

• Only 80-90% efficiency (vs 95%+ for wired)
• Lost energy becomes heat
• Alignment affects efficiency

Future Developments

• Longer range charging: Charging from across the room
• Higher power: Faster charging speeds
• Reverse wireless charging: Phones charging other devices