KEPCO HSP Series Operator Manual - Manual (Page 24)

2-10
HSPSERIES OPR 050614
2.7.5.4 LOAD CONNECTION - METHOD IV (PARALLEL OPERATION)
Identical HSP power supply models may be connected in parallel in order to provided increased
output current to a common load (see Figure 2-7). This permits the user to obtain significantly
higher load ratings than for a single HSP power supply. The number of power supplies required
is determined by dividing the required load current by the current rating of the applicable HSP
model, and rounding up to the next whole number when necessary. HSP power supplies incor-
porate fault detection circuitry which precludes the need for output blocking diodes, and utilize
active current sharing circuitry to distribute the load current equally among the paralleled units.
When operating HSP power supplies in any parallel configuration, load sharing must be imple-
mented among the paralleled modules; this is required for proper operation of the fault detector
(see PAR. 2.7.6). Figure 2-7 shows a typical parallel configuration using two power supplies;
additional parallel modules are added by scaling Figure 2-7.
.
FIGURE 2-7. LOAD CONNECTION - METHOD IV (PARALLEL/REDUNDANT OPERATION WITH HOT-SWAP)
2.7.5.4.1 REDUNDANCY AND HOT SWAP APPLICATIONS
HSP is specifically designed for use in critical applications where power supply redundancy and
on-line replacement of defective power supplies (hot-swapping) is required. Redundant opera-
tion is achieved by paralleling one or more power supplies in excess of the minimum number
required to support the load so that system operation is not compromised by the failure of a sin-
gle power supply. Any number of HSP power supplies (N+M) can be wired for redundant opera-
tion as long as (N) power supplies can support the load, M representing the total number of
failed power supplies.