Zener Diode Tutorial _ Simple Electronics
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3/16/12 Zener Diode Tutorial : simple electronics
1/3www.simple-electronics.com/2010/12/zener-diode-tutorial.html
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Zener Diode Tutorial
Ordinary diode allows current to flow in one direction only, zener diode
on the other hand allows the current to flow on both direction. When the
zener is forward bias, the voltage drop across is around 0.7V, which is
equal to the ordinary diode. But if the zener is reverse bias, it has a
voltage drop equal to its breakdown voltage, where in this case,
ordinary diode is open circuit or not conducting.
zener diode symbol
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3/16/12 Zener Diode Tutorial : simple electronics
2/3www.simple-electronics.com/2010/12/zener-diode-tutorial.html
One of the uses of this diode is for voltage regulation
or voltage reference. The figure below is an example on how the zener
diode provides regulation across the load. the voltage output is equal to
the zener diode voltage.
Example:
V_input = 15V
Zener = 10V
R = 500 ohm
Load = 2000 ohm
we can say that the current delivered to the load is equal to Vload/Iload
where Vload = Vzener = 10V, thus current of load = 5mA
voltage regulation
Zener can be connected in series to each other or connected back to
back depending on its purpose. Series connection (see circuit below),
provides different voltage reference or output with one input only. Example
the input voltage is 35V, you can have an output of 25V and 10V
connecting 25v and 10V zener in series.
series connection
Zener diode also can be connected back to back to
provide voltage regulation especially in square wave or sine wave signal
input. Example a sinusoidal wave has a magnitude of 50V at 60Hz (see
circuit below), the two zener diodes connected back to back provides a
regulated output of with the maximum magnitude of output equal to +15V
and -15V.See the output voltage (faded blue) and input voltage in diagram
below.
3/16/12 Zener Diode Tutorial : simple electronics
3/3www.simple-electronics.com/2010/12/zener-diode-tutorial.html
Newer Post Older Post
back to back connection
back to back zener output voltage
Sample project that uses zener diode as regulator
1. 12V to 6V DC converter using Zener diode and transistor
2. other regulator
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Labels: basic tutorial
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