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2.3
Regulation Types
Apart from the mechanical and electrical structure, the type of regulation is of major
importance for the choice of a power supply unit.
A distinction must generally be made between regulated and unregulated devices.
2.3.1
Unregulated Devices
Voltage fluctuations at the
output, good efficiency
With unregulated devices, the AC line voltage is transformed using a 50 Hz transformer
and then rectified. The pulsating DC voltage resulting from this process is smoothed and
filtered using capacitors.
50 Hz Transformer
L
Input
N
Rectifying
Smoothing
Output
5598D004
+
-
Figure 2-7
Circuit diagram for unregulated devices
Because of its few components this relatively simple circuit has the advantage of a
particularly long service life and a typical efficiency of 80%.
Due to the missing control level, output voltage fluctuations will occur in the case of
fluctuating input voltages and fluctuating current output.
Unregulated devices are used for supplying electromechanical loads such as contactors,
electromagnetic switches etc., which do not require a regulated output voltage.
2-10
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5598_en_03
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