HP BENCH Series User Manual

SECTION IV
PRINCIPLES OF OPERATION
^CIO 48V
REGULATOR
Q9.QII
6.2V
12.4V
+ OUT
METER
CIRCUIT
S2
CURRENT
SERIES
REGULATOR
07
CURRENT
+ 6.2V
RI2
CONSTANT
VOLTAGE
PULLOUT
SAMPLING
RESISTOR
CURRENT
LIMIT AMPL
03
CR30
-*o-x>o-o
SI
ON/OFF
SWITCH
VOLTAGE
INPUT
CIRCUIT
01 .02
CR 4
DRIVER
05
NOTE I; MAIN SUPPLY
OUTPUT VOLTAGES ARE:
MODEL VDC
AMPL
04
NOTE I
Rll
COARSE
VOLTAGE
62I3A
62I5A
62I7A
RIO
FINE
VOLTAGE
£
Figure 4-1. Simplified Schematic
4-1 SIMPLIFIED DISCUSSION
4-2 The power supply, as shown on the simplified
schematic diagram of Figure 4-1, consists of a
power transformer, rectifier and filter, series regu
lator, error amplifier and driver, constant voltage
input circuit, current limiting circuit, reference
regulator circuit, and a metering circuit.
4-3 The input line voltage passes through the
power transformer to the rectifier and filter. The
rectifier-filter converts the ac input to raw dc
which is fed to the positive terminal via the regu
lator and current sampling resistor network. The
regulator, part of the feedback loop, is made to
alter its conduction to maintain a constant output
voltage. The voltage developed across the current
sampling resistor is the input to the current limit
ing circuit. If the output current that passes
through the sampling resistor exceeds a certain
predetermined level, the current limiting circuit
applies a feedback signal to the series regulator
which alters the regulator's conduction so that the
output current does not exceed the current limit.
The constant voltage input circuit obtains its input
by sampling the output voltage of the supply. Any
changes in output voltage are detected in the con
stant voltage input circuit, amplified by the error
4-1

HP BENCH Series Specifications

General

Brand	HP
Model	BENCH Series
Category	Power Supply
Language	English