Wireless power transfer Using NPN Transistor BC547

Transmitter Circuit:

1. NPN Transistor (BC547):
   • The NPN transistor is used as a switch in the transmitter circuit.
2. Transmitter Coil:
   • The transmitter coil is connected to the collector of the NPN transistor. When the transistor is switched on, it generates an oscillating magnetic field in the coil.
3. Capacitor (C1):
   • C1 is connected in parallel with the transmitter coil for filtering purposes.
4. Power Supply:
   • The transmitter circuit is powered by an external power supply.

Receiver Circuit:

1. Receiver Coil:
   • The receiver coil is placed in close proximity to the transmitter coil to capture the magnetic field.
2. Diode (D1):
   • D1 is used for rectification of the induced AC voltage from the receiver coil.
3. Capacitor (C2):
   • C2 is connected in parallel with the receiver circuit for filtering.
4. Resistor (R1):
   • R1 is connected between the base and emitter of the NPN transistor for biasing.
5. NPN Transistor (BC547):
   • The NPN transistor is used as a switch in the receiver circuit. It turns on when a sufficient voltage is received from the transmitter.
6. LED (optional):
   • An LED can be connected in series with a resistor for visual indication when the receiver circuit is powered.
7. Power Supply:
   • The receiver circuit is powered by an external power supply.

How It Works:

1. In the transmitter circuit, when the transistor is turned on, it generates an oscillating magnetic field in the transmitter coil.
2. The receiver coil, placed in close proximity to the transmitter coil, captures the magnetic field and induces an AC voltage.
3. The induced AC voltage is rectified by the diode (D1) in the receiver circuit.
4. The rectified voltage charges the capacitor (C2) for filtering.
5. The NPN transistor in the receiver circuit is biased by the rectified voltage. When the voltage is sufficient, the transistor turns on.
6. The LED (optional) lights up, indicating successful wireless power transfer.