vapaakytkentädiode
Vapaakytkentädiode, also known as a flyback diode or freewheeling diode, is a semiconductor device used to protect electronic components from voltage spikes. These spikes can occur when an inductive load, such as a motor or relay coil, is switched off. When the current to the inductor is suddenly interrupted, the inductor's magnetic field collapses, inducing a high voltage in the opposite direction. This induced voltage can be significantly higher than the supply voltage and can damage other components in the circuit.
The vapaakytkentädiode is connected in parallel with the inductive load, but in reverse bias. This means that
In essence, the vapaakytkentädiode "catches" the flyback voltage, allowing it to freewheel harmlessly. This protection is