Oring-Fet; Pson12V - Huawei PAC2000S12-B1 PSU Technical Manual

PAC2000S12-B1 PSU
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1. In case of input outage, if the load power is greater than 50%, the PSU needs 10–120 ms to set the IIC alarm
position to 1; if the load power is less than or equal to 50%, the PSU needs 20–120 ms to set the IIC alarm
position to 1.
2. The PSU supports the requirement of storing NVDIMM.
1. T8 scenario: There is a time requirement for input power failure, input overvoltage, input undervoltage,
fan fault, and overtemperature. There is no time requirement on the OPOK# alarm caused by output
overcurrent, output short circuit, output overvoltage, or output short circuit. In the case of input power
failure, undervoltage, or overvoltage, OPOK# is not allowed to rebound after dropping.
2. The PSU can report an OPOK# fault in advance for predictable PSU faults (such as input power failure,
input overvoltage, input undervoltage, fan fault, overtemperature, and output undervoltage). In this case,
the requirement that the output power must be less than 11.4 V does not have to be met.
3. T1 and T2 tests can be performed only after the auxiliary power supply is powered off.
4. T3 must meet the minimum load requirements.
5. The PSON# signal is valid when the PSON# high level is detected for 25 ms or longer.

9.2 ORing-FET

PSU side: An ORing-FET failure isolation circuit needs to be added inside the PSU MV12 output. In
the parallel scenario (1+1, 2+2, 3+3 backup), if one PSU is faulty, it needs to exit automatically to
prevent the 12 V bus of the PSU from being abnormal.
System side:
Capacitance on the 12 V input side: The equivalent capacitance must be greater than the
minimum capacitive load (540 μF x N) of PSUs (N indicates the number of PSUs configured in the
system, and the output power of a single PSU is less than 1000 W) or 1000 μF x N (N indicates the
number of PSUs configured in the system, and the output power of a single PSU is greater than
1000 W), and less than the maximum capacitive load 8000 μF of the PSUs.
12 V load: greater than the minimum load 3 A of the PSU and less than the rated load of the PSU
Figure 9-2 ORing-FET circuit

9.3 PSON12V#

The PSON12V# signal is an on/off signal that controls the PSU MV12 output remotely. If the
PSON12V# signal is at low level, the PSU enters MV12 output mode. If the PSON12V# is at high
level, the PSU enters MV6 output mode.
PSON12V# signal. PSON# is at high level for 25 ms or longer and is valid.
Technical Manual
Figure 9-3 shows the interconnect diagram of the
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9 Control Functions