Tutorial 6
Overview of the Power Supply Operation
E364xA User’s and Service Guide 157
This power supply has two ranges, allowing more voltage at
a lower current or more current at a lower voltage. Single
range supplies can only output maximum power at full- scale
voltages and full- scale current. This supply can provide
output power that is close to maximum at full- scale for both
ranges. The pre- regulator in this power supply uses solid
state transformer tap switches on the secondary winding of
the power transformer. This technique is very effective in
reducing the power dissipated in the series element.
In terms of performance, a linear regulated supply has a
very precise regulating properties and responds quickly to
variations of the line and load. Hence, its line and load
regulation and transient recovery time are superior to
supplies using other regulation techniques. The power supply
also exhibits low ripple and noise, is tolerant of ambient
temperature changes, and with its circuit simplicity, has a
high reliability.
This power supply contains a linear regulated power supply.
It is controlled by a control circuit that provides voltages to
program the outputs. The power supply sends back to the
control circuits a voltage representing the output at the
terminals. The control circuits receive information from the
front panel and send information to the display. Similarly
the control circuits “talk” to the remote interface for input
and output with the GPIB and RS- 232 interfaces. The
remote interface is at earth ground and isolated from the
control circuit and the power supply.
Figure 6-2 Block diagram of the power supply showing the remote
interface isolation
GPIB
RS-232
ISOLATION
POWER
SUPPLY
OUTPUT
CONTROL
DISPLAY
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