Do power supplies handle peak load peaks?
Power supplies are designed to handle load peaks so that a smaller supply unit can provide long-term reliable service. Systems designers must match not only equipment continuous load to their power supply, but also peak loads, peak load duration, and time between peaks.
Can a power supply supply a peak load?
The expected load is only part of the story. Most applications have a typical load, a maximum load, and brief periods with a peak load that exceeds both typical and maximum. To accommodate this, power supplies can supply peak loads above their maximum rating for a limited time.
Why do high-peak power supply systems need a peak load capacity?
The performance of power supplies in high-peak power applications is essential for reducing grid strain during these periods. With the right peak load capability, a smaller, less expensive supply unit can serve reliably for the life of the installation.
What causes a power supply to peaks?
Peak loads come from inrush current at startup, motor start current spikes, and unconventional conditions that may occur in a power load over and above steady state draw. Power supplies are designed to handle load peaks so that a smaller supply unit can provide long-term reliable service.
What is a good peak pulse for a power supply?
The chart cautions that above 150% (coded in purple) may lead to easy fuse-tripping conditions. A peak pulse of up to 150% of the supply’s maximum rated load is reliable for as long as 7.5s. Further examination of the chart shows that the load must drop to 100% or lower for 52.5s after a maximum duration peak load.
How do I choose a power supply?
Choosing a power supply requires more than just ensuring the rated output is greater than the expected load and “calling it good.” The expected load is only part of the story. Most applications have a typical load, a maximum load, and brief periods with a peak load that exceeds both typical and maximum.
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