UG:108
vicorpower.com
Applications Engineering: 800 927.9474
Page 25
Current Share Boards - Optional Feature
"Current sharing" also known as Load Sharing, is the ability to divide the output current
evenly across all active power supplies. This greatly reduces stresses on each power
supply and allows them to run cooler, resulting in higher reliability. Standard "current
sharing" techniques typically utilize shunt resistors or Hall Effect devices to measure
the current from each power supply. Power shunt resistors continually dissipate power
and require cooling especially when dealing with high output currents of >100 Amps.
Hall Effect devices measure magnetic fields generated by current flowing through a
conductor and, although they dissipate no power, they tend to be large and expensive.
First developed by Westcor Engineering for paralleling MegaPAC supplies, the Box-to-
Box Current Share Board or CSB allows two or more Vicor power supplies to current
share by utilizing the inherent voltage drop produced in the negative output return
cable. This eliminates the need for additional shunt resistors or expensive Hall Effect
devices and provides a simple 5 wire connection method to achieve a +/-1mV accuracy
between the Negative Output power rails. This accuracy translates to a 1% current
sharing if there is a total of 100mV conductional voltage drop in the negative
return path.
Constructed as a current source to drive the Trim pin of a Vicor module, the design
uses an accurate comparator circuit to monitor the power returns. In addition, the
circuit is unidirectional and can only trim an output voltage up. The benefit is that
only the supply that is supporting less current is adjusted up. This action balances the
currents to the load by matching the output voltages of the supplies. In the case of one
supply failing, the circuit will attempt to trim the failed supply only. This will leave the
remaining functional supply alone to provide power to the load at its nominal voltage.
Thus the circuit also offers simple redundancy. In addition, because CSB functions as
a current source, the Trim outputs (T1 and T2) of the CSB can be placed in parallel to
create a summing node. This allows current sharing between more than two supplies by
paralleling the T2 output of one CSB circuit with the T1 output of the next CSB.
Environmental Characteristics
Storage Temperature
-40°C to 85°C
Operating Temperature**
-20°C to +45°C full power, -20°C to +65°C half power
Humidity
0 to 95% non-condensing
Altitude
Derate 2.6% total output power for each 1,000 ft to a maximum operating
altitude of 15,000 ft. Non-operating storage maximum altitude is 40K.
Safety Approvals
cURus – UL 60950-1, CSA 60950-1
cTUVus – EN 60950-1, UL 60950-1, CSA 60950-1
CE Mark – Low Voltage Directive, 73/23/EEC amended by 93/68/EEC
Product Weights
3 Phase MegaPAC - EL
: 21.6 lbs (9.8 kg) fully configured
4 kW MegaPAC
: 22 lbs. (10 kg) fully configured
Warranty
2 years limited warranty.
See
for complete warranty statement.
* See Vicor module specifications. A preload may be necessary for modules trimmed down below
90% of normal output voltage.
** Operating temperature is 45°C using any combination of modules and output voltages as long as
the front end rating is not exceeded. Normal derating applies to half power if the ambient
temperature is 20°C hotter.
Specifications (Cont.)
