Series Operation; Parallel Operation - TDK-Lambda HWS-L/BAT Series Instruction Manual

6-11.

Series Operation

For series operation, either method (A) or (B) is possible.
In series operation, the actual voltage between output and
(500VAC).
In addition, take note that using the product with total output voltage 60V or more does not comply with SELV
in safety standard. In series operation, the rising waveform may have steps.
When connecting with a battery, connect an ORing-diode to the output side of the product.
Method (A)
Power
Supply
Power
Supply
6-12.

Parallel Operation

Current balancing function is provided. Both operations mode (A) and (B) are possible.
(A) To Increase the Output Current
Connect PC-to-PC terminal and COM-to-COM terminal, the current balancing function activates and output current of
each power supply is equivalently supplied to load. Wires to PC terminals, COM terminals shall be as short as possible
and same length and twisted.
1.
Adjust the output voltage of each power supply to be same value within 1% or 100mV whichever is smaller.
2.
Use same length and type of wires for all load lines.
3.
Please make sure that the sum of output current values does not exceed a value obtained from the right side of
following equation.
Maximum of total output current in parallel operation Rated current per unit Number of units 0.9
4. Parallel operation is possible up to 5 units.
(B) To Use as a Backup Power Supply
1.
Adjust the output voltage (Vo) of each power supply to be same value within 1% or 100mV whichever is smaller.
2.
Set power supply output voltage higher to compensate the forward voltage drop of diode.
3.
Use within the specifications for output voltage and output current.
4.
When one of power supplies fails, the remaining non-failure power supplies continue to maintain the output. If one
of the power supplies stop operating, the output voltage may change about 5%( 36V, 60V) in its transient response.
( A )
Power
Supply
PC COM
PC COM
+S
+ Vm
-Vm
-S
+S
+ Vm
-Vm
-S
+S
+ Vm
Load
-Vm
-S
+S
+ Vm
-Vm
-S
must be less than withstand voltage
Method (B)
Load
( B )
Power
Supply
PC COM
PC COM
- 13 -
TDK-Lambda
HWS-L/BAT Series
INSTRUCTION MANUAL
+S
+ Vm
Power
Supply
-Vm
-S
+S
+ Vm
Power
Supply
-Vm
-S
+S
Io
V
+ Vm
Vo
Load
-Vm
-S
Output Power
+S
V
+ Vm
(W) =(Vo+Vf)
-Vm
-S
Load
Load
Io