How does the Diode work in the relay circuit? The diode plays a crucial role in circuit protection and rectification. Its greatest characteristic is its one-way conductivity. That is the current can only flow from One Direction.
The forward of the diode flows through the block; when reversed, there is a PN junction inside the diode composed of a P-type semiconductor and an N-type semiconductor.
Due to the existence of the PN junction, a circuit is like a one-way street in a car. The current is not allowed to flow backward. Otherwise, the driving license will be revoked. This is how a diode conducts electricity in One Direction. I hope you understand.
A diode is typically used with relays to suppress the back EMF voltage to demonstrate its function.
Demonstration Using Simple Circuit
Let’s connect and lead in parallel with the relay noticed that when the power supply disconnects the LED lights, it’s due to high voltage spikes produced by the relay coil. This can damage the driving circuit.
However, when a diode is disconnected in parallel, the LED does not light, this is because the diode circulates back the energy to the relay coil, thereby protecting the driving circuits.
