4.1 Series operation
¡
Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output current in series con-
nection should be lower than the lowest rated current in each unit.
Power
supply
Power
supply
Power
supply
Power
supply
Load
Load
Load
(a)
(b)
Fig.4.1 Examples of series operation
4.2 Parallel operation/Master-slave operation
¡
Parallel operation is available by connecting the units as shown in
Fig.4.2.
¡
As variance of output current drew from each power supply is
maximum 10%, the total output current must not exceed the value
determined by the following equation.
(Output current in parallel operation)
=(the rated current per unit)
X
(number of unit)
X
0.9
When the number of units in parallel operation increases, input
current increase at the same time. Adequate wiring design for in-
put circuitry is required, such as circuit pattern, wiring and current
capacity for equipment.
In parallel operation, the maximum operative number of units is 11.
Table 3.3 Recommended value of external potentiometer & resistor
No. Adjustable range [%] Number of unit
External parts value [
W
]
VR1
R1
R2
1
�
5
Single
5k
75k
1k
2
2sets
36k
3
3sets
24k
4
�
10
Single
5k
36k
910
5
2sets
18k
6
3sets
12k
(2) Adjusting method by applying external voltage
¡
By applying the voltage externally at TRM, output voltage become
adjustable.
¡
Output voltage is calculated by the following equation.
(Output voltage)
= (Applied voltage externally)
X
(Rated output voltage)
¡
The output adjustment range for DBS700B is shown in Fig.3.7.
Input Voltage [V]
200V
100
105
110
250
0
0
60
Output V
oltage [%]
Fig.3.7 DBS700B Output Voltage Adjustment Range
3.8 Isolation
¡
For a receiving inspection, such as Hi-Pot test, gradually
increase(decrease) the voltage for a start(shut down). Avoid using
Hi-Pot tester with the timer because it may generate voltage a few
times higher than the applied voltage, at ON/OFF of a timer.
4 Series and Parallel
Operation
DC-DC Converters Bus Converter
-
Power Module Type
Instruction Manual
DBS-17
June 26, 2020
