The Question is what is a diode ? A diode is a semiconductor device designed to conduct current in one direction only.The symbol for this device is
A diode is designed to conduct current from its anode to its cathode , but not in the opposite direction.
When a voltage is applied to the diode in the forward direction , a large current flow results.When a voltage is applied to the diode in the reverse direction , the current flow is limited to very very small value. If a large enough reverse voltage is applied to the diode , eventually the diode will break down and allow current to flow in the reverse direction.
Diodes are rated by the amount of power they can safely dissipate and by the maximum reverse voltage that they can take before breaking down. The power dissipated by the diode during forward operation is equal to the forward voltage drop across the diode times the current flowing through it.The maximum reverse voltage of a diode is known as its peak inverse voltage (PIV).
Diodes are also rated by thier switching time.that is by the time it takes to go from the off state to the on state and vice versa. Because power diodes are large , high power devices with a lot of stored charge in their junctions they switch states much more slowly then the diodes in electronic circuits.For the very fast switching applications , special diodes called fast recovery high speed diodes are employed.
When a voltage is applied to the diode in the forward direction , a large current flow results.When a voltage is applied to the diode in the reverse direction , the current flow is limited to very very small value. If a large enough reverse voltage is applied to the diode , eventually the diode will break down and allow current to flow in the reverse direction.
Diodes are rated by the amount of power they can safely dissipate and by the maximum reverse voltage that they can take before breaking down. The power dissipated by the diode during forward operation is equal to the forward voltage drop across the diode times the current flowing through it.The maximum reverse voltage of a diode is known as its peak inverse voltage (PIV).
Diodes are also rated by thier switching time.that is by the time it takes to go from the off state to the on state and vice versa. Because power diodes are large , high power devices with a lot of stored charge in their junctions they switch states much more slowly then the diodes in electronic circuits.For the very fast switching applications , special diodes called fast recovery high speed diodes are employed.
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