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Basics
2.3.2
Regulated Devices
Series controller
Primary-switched
controller
Constant output voltage,
poor efficiency
Two types of regulated power supply units have been successfully implemented: On the
one hand, the widely distributed series controllers and on the other hand, the primary
switched-mode controllers. Success in the development of power electronics has
contributed to primary switched-mode power supply units gaining more and more
importance.
Linearly Regulated Devices
With linearly regulated devices, the AC line voltage is transformed using a 50 Hz
transformer and then rectified. The pulsating DC voltage is smoothed and filtered using
capacitors. Up to there, the technical configuration is very similar to the one of the
unregulated device.
After rectification, linearly regulated power supply units either have a DC series controller
or a DC quadrature controller in the form of a power transistor, which functions as a
variable resistor. Depending on the forward DC resistance of the transistor, the current
flowing through the load is regulated in such a way that the voltage across the load remains
constant.
L
50 Hz Transformer
Tr
Rectifying
G
Smoothing
C1
T
Regulation
Smoothing
C2
+
Controller
Input
N
Figure 2-8
Circuit diagram for linearly regulated devices
Output
5598D005
-
The efficiency of these circuits is approximately 40% to 60%, depending on the circuit
structure. The power dissipation consists of the losses in the 50 Hz transformer, the
rectifier, the transistor and the closed-loop control circuit.
The transformer must be designed large enough to provide useful power and power
dissipation. This means an increased size of the transformer of at least 50%.
The field of electronics is the optimum application for these devices. Here, a precisely
regulated 24 V DC voltage, which is as free as possible from harmonics, is required.
5598_en_03
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2-11
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