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INDEX |
MY EXPERIENCE IN AUTONOMOUS ROBOTICS | |
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Diodes Diodes continued Zener Diode Zener Diode Table
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DIODES Diodes are two terminal devices which conduct electricity in one direction.Current flows from anode to cathode when the diode is forward biased. In a normal forward biased diode, energy is dissipated as heat in the junction, but in LED's energy dissipated as visible light. In robotics we use normal diodes as free wheeling diodes or to make power supply. LED's are of two types - IR led and normal LED. IR LED emits Infra Red radiations while normal LED emit visible light. So first talk about a normal diode. Mostly we us 1N4001 or 1N4007 as free wheeling diodes for motors or relays, sometimes in H-bridge also.
From the above figure try to find out which diodes are forward biased and which are reversed biased. You can see that a) is represents symbol of a diode b), d) are forward biased and c) is reverse biased(voltage at the P junction should be greater than N junction by .7V).
Figure shows normal diodes with different power ratings. I don't know about the transistor type diodes. High power rating diodes are used for high power motors. |
