6 Tutorial
Overview of the Power Supply Operation
156 E364xA User’s and Service Guide
Overview of the Power Supply Operation
The basic design model for power supplies consists of
placing a control element in series with the rectifier and
load device.
Figure 6- 1 shows a simplified schematic of a
series regulated supply with the phase- controlled
pre- regulator described as a power switch and the series
element depicted as a variable resistor. The phase- controlled
pre- regulator minimizes the power dissipated at the series
element by maintaining the voltage drop across the series
element at low and constant. Feedback control circuits
continuously monitor the output and adjust the series
resistance to maintain a constant output voltage. Because
the variable resistance of
Figure 6- 1 is actually one or more
power transistor operating in the linear (class A) mode,
supplies with this type of regulator are often called linear
power supplies. Linear power supplies have many advantages
and usually provide the simplest most effective means of
satisfying high performance and low power requirements.
Figure 6-1 Diagram of a simple series power supply
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