Chapter 7 Tutorial
Overview of Agilent E3633A and Agilent E3634A Operation
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Overview of Agilent E3633A and Agilent E3634A Operation
The basic design technique, which has not changed ove r the y ears, consists of
placing a control element in series with the rectifier and load device. Figure
7-1 shows a sim pli fied schem atic of a series regulated suppl y 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 a low and constant. Feedback control
circuits continuously monitor the output and adjust the series resistance to
maintain a constant output voltage . Beca use the variable resistance of Figure
7-1 is actuall y one or more power transi stor 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 performan ce and low power
requirements.
Figure 7-1. Diagram of Simple Series Power Supply
This pow er suppl y has two ranges, all owi ng more voltage at a lower current.
To maintain the voltage across the pre-regulator efficient in accordance with
the demands imposed by the dc output voltage and current of the supply, this
power supply als o uses the pre-regulator whi ch is controll ed by transformer
tap switching before the rectifier bridge in the Figure 7-1. This is one of several
techniques using semiconductors for preregulation to reduce the power
dissipated across the series element.
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