5.1 Series operation
¡
Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output current in series
connection should be lower than the lowest rated current in each
unit.
5 Series and Parallel
Operation
¡
Even a slight difference in output voltage can affect the balance
between the values of I
1
and I
2
.
Please make sure that the value of I
3
does not exceed the rated
current of a power supply.
I
3
the rated current value
6.1 Mounting method
¡
The unit can be mounted in any direction. When two or more
power supplies are used side by side, position them with proper
intervals to allow enough air ventilation. Aluminum base plate
temperature around each power supply should not exceed the
temperature range shown in derating curve.
¡
Avoid placing the DC input line pattern lay out underneath the unit,
it will increase the line conducted noise. Make sure to leave an
ample distance between the line pattern lay out and the unit. Also
avoid placing the DC output line pattern underneath the unit be-
cause it may increase the output noise. Lay out the pattern away
from the unit.
¡
High-frequency noise radiates directly from the unit to the atmo-
sphere. Therefore, design the shield pattern on the printed circuit
board and connect its one to FG.
The shield pattern prevents noise radiation.
6 Implementation
-
Mounting Method
4.7 Withstanding Voltage / Isolation Voltage
¡
When testing the withstanding voltage, make sure the voltage is
increased gradually. When turning off, reduce the voltage gradual-
ly by using the dial of the hi-pot tester. Do not use a voltage tester
with a timer as it may generate voltage several times as large as
the applied voltage.
(3) Output voltage increasing
¡
By connecting the external resistor (RU), output voltage becomes
adjustable to increase.
The external resistor (RU) is calculated the following equation.
RU
TRM
+VOUT
+S
-S
-VOUT
5.2 Redundancy operation
¡
Parallel operation is not possible.
¡
Redundancy operation is available by wiring as shown below.
(2) Output voltage decreasing
¡
By connecting the external resistor (RD), output voltage becomes
adjustable to decrease.
The external resistor (RD) is calculated the following equation.
RD
TRM
+VOUT
+S
-S
-VOUT
DC-DC Converters Bus Converter.Power Module Type
Instruction Manual
DHS-20
DHS
Fig. 5.1 Examples of series operation
Load
Load
Power
Supply
Power
Supply
Load
Power
Supply
Power
Supply
(a) (b)
Fig. 5.2 Example of Redundancy Operation
+S
+VOUT
-S
-VOUT
+S
+VOUT
-S
-VOUT
Load
I
I
1
I
3
2
Fig. 4.8 Connection for output voltage increasing (DHS200/250)
V
OR
:Rated output voltage [V]
V
OU
:Output voltage needed to set up [V]
V
ref
:Refarence voltage [V]
V
ref
=2.495 [V]
RU=
[
3.0
X
- 1.51
]
X
+ 0.01
- 1.0
V
OR
V
ref
V
OU
V
OR
V
OU
V
OR
+S, -S : DHS200/250
DHS200
DHS250
Fig. 4.7 Connection for output voltage decreasing (DHS200/250)
RD= [k
W
]
1.51
X
- 0.01
1.0 -
V
OD
V
OR
V
OD
V
OR
V
OR
:Rated output voltage[V]
V
OD
:Output voltage needed to set up[V]
DHS200
DHS250
me̲dhs1.indd DHS-20
me dhs1 indd DHS-20
2015/06/19 11:08:05
2015/06/19 11:08:05
