The sharp increase in the characteristic current-voltage curve
for Zener diodes above the breakdown voltage makes it
suitable for stabilising small direct voltages. When the input
voltage is increased beyond the breakdown voltage, the current
increases sharply while the diode resistance gets smaller and
smaller. Therefore, the voltage at the Zener diode remains
nearly constant.
A resistor must be insert to ensure that the maximum allowable
dissipation power for the Zener diode is not exceeded.
If a load resistor is connected in parallel to the Zener diode, the
current flowing through the Zener diode is reduced in favour
of the load current. Stabilisation is interrupted when there is no
more current flowing through the Zener diode. For this reason,
the use of Zener diodes is limited to relatively small
load currents. Electronic regulation circuits are used for larger
loads.
There is a closely graduated selection of Zener diodes in the
voltage range of 3 V to 200 V, meaning that there are
diode types for any desired voltage.
Investigate the functioning of a voltage stabiliser with a
Zener diode.
| Materiallist (Excerpt) |
Product |
Amount |
|
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V
|
13505-93
|
1
|
|
Multi-range meter, analogue
|
07028-01
|
2
|
|
Socket module for incandescent lamp E10, SB
|
05604-00
|
1
|
|
Interrupted connector module, SB
|
05601-04
|
1
|
|
Straight connector module with socket, SB
|
05601-11
|
1
|
|
Angled connector module with socket, SB
|
05601-12
|
1
|
|
Z-diode module ZF4.7, SB
|
05652-00
|
1
|
|
Resistor module 50 Ohm, SB
|
05612-50
|
1
|
|
Straight connector module, SB
|
05601-01
|
1
|
|
Angled connector module, SB
|
05601-02
|
2
|
|
T-shaped connector module, SB
|
05601-03
|
2
|
|
Filament lamps 4V/0.04A, E10, 10
|
06154-03
|
1
|
|
Connecting cord, 32 A, 500 mm, red
|
07361-01
|
2
|
|
Connecting cord, 32 A, 500 mm, blue
|
07361-04
|
2
|
|
Connecting cord, 32 A, 250 mm, red
|
07360-01
|
1
|
|
Connecting cord, 32 A, 250 mm, blue
|
07360-04
|
1
|
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