36
3.1.7 Diode
Diodes let the current pass in only one direction. For that reason, they are
used to rectify AC voltages and to block undesirable polarity with DC
voltage, among other things. You can picture the functioning of a diode in
normal operation most easily as a non-return valve (water installations).
When pressure (current) is directed onto the valve (diode) in blocking
direction then the current will be blocked.
Fig.3.13: circuit symbol, Scottkydiode,
the left side signed with A is the anode
(+), the right side signed with K is the
cathode (-)
The pressure has to built up in contrary direction (direction of the arrow) to
overcome the spring pressure of the valve. The valve opens and the current
flows. The pressure, which is mentioned in this mechanical model to
overcome the spring pressure, corresponds to the forward voltage of the
diode. A certain voltage in the flowing direction of the diode is needed to
move into a conductive state.
Fig.3.14: Schottykdiode, type
BAT48. The cathode of the
diode can be recognized by
the imprinted black ring, the
other connection wire is the
anode. The technical current
direction goes from the anode
to the cathode.
Information: With the enclosed Schottky diodes the current begins to flow
at 0,25V in forward direction (circuit symbol: arrow). This allows an al-
most loss-free transmission.
Содержание D100E
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