Normal Series Operation - Agilent Technologies E361 A Series Operating And Service Manual

Setting Voltage and Current. Turn the slave unit's CURRENT
control fully clockwise. Adjust the master unit's controls to set the
desired output voltage and current. The master supply operates
in a completely normal fashion and may be set up for either con-
stant voltage or constant current operation as required. Verify that
the slave is in CV operation.
For auto-parallel operation of two supplies, the combined output
voltage is the same as the master unit's voltage setting, and the
combined output current is two times the master unit's current. In
general, for two supplies, the auto-parallel output current(Io) is
Io = Im + Is = 2Im
where Im = master unit's output current
Is = slave unit's output current
Proportional currents from auto-paralleled units require
equal load-lead voltage drops. Connect each supply to
the load using separate pairs of wire with length chosen
to provide equal voltage drops from pair to pair. If this is
not feasible, connect each supply to a pair of distribution
terminals using equal- voltage-drop wire pairs, and then
connect the distribution terminals to the load with a single
pair of leads.
MASTER POWER SUPPLY
LOCAL
MASTER
M/S 1 M/S 2 CV CC SENSE
SLAVE REMOTE
SLAVE POWER SUPPLY
LOCAL
MASTER
M/S 1 M/S 2 CV CC SENSE
SLAVE
REMOTE
Figure 9. Auto-Parallel Operation of Two Supplies
Overvoltage Protection. Adjust the desired OVP shutdown limit
using the master unit's OVP Adjust control. Set the slave units'
OVP limits above the master's. When a master-unit shuts down,
the master programs the slave units to zero voltage output. If a
slave unit shuts down, it shuts only itself down. If the required cur-
rent is great enough, the master will switch from CV to CC opera-
tion.
Remote Sensing. To remote sense with auto-parallel operation,
connect remote-sense leads only to the master unit according to
the remote-sensing instructions.
Remote Analog Voltage Programming. To remote program with
auto-parallel operation, set up only the master unit for remote pro-
_ _ _
+ + +
OUT
+S -S CV CC VREF A1 A2 A3 A4 A5
LOAD
_ _
_
+
+ +
+S OUT -S CV CC VREF A1 A2 A3 A4 A5
gramming according to the remote-programming instructions.
MASTER POWER SUPPLY
MASTER
M/S 1 M/S 2 CV
SLAVE
SLAVE POWER SUPPLY
MASTER
M/S 1 M/S 2 CV
SLAVE
SLAVE POWER SUPPLY
MASTER
M/S 1 M/S 2 CV
SLAVE
Figure 10. Auto-Parallel Operation of Three Supplies

NORMAL SERIES OPERATION

Series operation of two or more power supplies can be accom-
plished up to the output isolation rating of any one supply to
obtain a higher voltage than that available from a single supply.
Series connected supplies can be operated with one load across
both supplies or with a separate load for each supply. These
power supplies have a reverse polarity diode connected across
the output terminals so that if operated in series with other sup-
plies, damage will not occur if the load is short-circuited or if one
supply is turned on separately from its series partners. When this
connection is used, the output voltage is the sum of the voltages
of the individual supplies. Each of the individual supplies must be
adjusted in order to obtain the total output voltage. Figure 11
shows the rear panel switch settings and terminal connections for
normal series operation of two supplies.
POWER SUPPLY
LOCAL
MASTER
M/S 1 M/S 2 CV CC
SLAVE REMOTE
POWER SUPPLY
LOCAL
MASTER
M/S 1 M/S 2 CV CC
SLAVE
REMOTE
Figure 11. Normal Series Operation of Two Supplies
1-12
_ _ _
+ + +
LOCAL
CC SENSE
+S OUT -S CV CC VREF A1 A2 A3 A4 A5
REMOTE
LOAD
_ _ _
+ + +
LOCAL
CC SENSE
+S OUT -S CV CC VREF A1 A2 A3 A4 A5
REMOTE
_ _ _
+ + +
LOCAL
CC SENSE
+S OUT -S CV CC VREF A1 A2 A3 A4 A5
REMOTE
_ _
_
+ + +
SENSE
OUT
+S -S CV CC VREF A1 A2 A3 A4 A5
LOAD
_
_ _
+ +
+
SENSE
OUT
+S -S CV CC VREF A1 A2 A3 A4 A5