Hold-up time (bridging time)
Hold-up time is a bridging time that describes the period during which the specified output power continues to be provided in the event of an input voltage failure. Even normal power supply units can bridge short-term power failures of up to a few seconds using appropriately dimensioned input storage electrolytic capacitors. The bridging time is long and the power OK signal is accurate. The bridging time is much longer than required (17 ms).
Timings
The power supply also supports alternative power saving modes.
Inrush current (starting current or inrush current)
All power supply units generate a so-called inrush current, which often far exceeds their nominal current consumption. The causes are the charging of the different capacitances in the input circuit and in the EMC filters, the build-up of the magnetic field in the transformer core and even the charging of the capacitors in the output filter. This input current only drops back to normal values when the transformer is operating stably. The inrush current is low at 115 V and normally high at 230 V. I have started using a new method to measure the inrush current, so you should expect higher values in the upcoming tests, especially at 230 V.
- 1 - Introduction, technical data and test report
- 2 - Unboxing, cables and protective circuits
- 3 - Teardown: topology, components, processing
- 4 - Load Regulation, Ripple Suppression, Transient Resonse
- 5 - Hold-Up Time, Timings, Inrush-Current
- 6 - Average Efficiency and PF
- 7 - Noise and Fan Speed
- 8 - Summary and conclusion
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