Compaq ProLiant 8000 Compaq ProLiant 8000 Server Technology - Page 17

Load Balancing, Power Factor Correction, Hot-Plug Capability, System, Board, Power, Backplane

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TC000603TB TECHNOLOGY BRIEF (cont.) ... Power Backplane Power Supply DC AC/DC AC Converter OS Power Switch System Board ACPI Controller I2C Bus Microcontroller Power On Soft Power Down Figure 10: Power supply schematic. Load Balancing The power supplies automatically load balance to within 10 percent of the average current of all supplies. Before the power comes up, the master power supply matches its output load rails to those of the other power supplies so that the load is automatically balanced across all power supplies. If one supply fails, the load balancing feature allows the other supplies to pick up the remaining power load quickly. Power Factor Correction Compaq's intelligent power supplies have built-in power factor correction to synchronize the voltage and current phases. This helps ensure that maximum power is available. It also reduces the return current in the ground line, which reduces the overall power consumption. Hot-Plug Capability When a power supply is hot swapped, the microcontroller governs the power-up and power-down sequences, enables the health drivers to calculate redundancy "on the fly," and informs the health drivers of changes in load. Compaq hot-plug power supplies are readily identifiable by their portcolored bezel, as shown in Figure 11. Port-colored bezel Figure 11: Front view of hot-plug power supply with port-colored bezel. 17

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T
ECHNOLOGY
B
RIEF
(cont.)
17
TC000603TB
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System
Board
OS
Power
Backplane
Power Supply
AC/DC
Converter
AC
DC
Microcontroller
Power
Switch
Power On
Soft Power Down
I
2
C Bus
ACPI
Controller
Figure 10:
Power supply schematic.
Load Balancing
The power supplies automatically load balance to within 10 percent of the average current of all
supplies.
Before the power comes up, the master power supply matches its output load rails to
those of the other power supplies so that the load is automatically balanced across all power
supplies.
If one supply fails, the load balancing feature allows the other supplies to pick up the
remaining power load quickly.
Power Factor Correction
Compaq’s intelligent power supplies have built-in power factor correction to synchronize the
voltage and current phases.
This helps ensure that maximum power is available.
It also reduces the
return current in the ground line, which reduces the overall power consumption.
Hot-Plug Capability
When a power supply is hot swapped, the microcontroller governs the power-up and power-down
sequences, enables the health drivers to calculate redundancy “on the fly,” and informs the health
drivers of changes in load.
Compaq hot-plug power supplies are readily identifiable by their port-
colored bezel, as shown in Figure 11.
Port-colored bezel
Figure 11:
Front view of hot-plug power supply with port-colored bezel.