Switch Power Calculation for Pulsed Signals

Updated Sep 26, 2024

Reported In

Hardware

  • PXIe-2737

Issue Details

In the Specification for PXIe-2737 , there is a description that the maximum switching power = 60 W, 62.5 VA. When the pulse duty cycle is 5 % with 84 Vp-p, 2 A, how should we calculate it? Can we calculate like 84 V * 2 A * 0.05 = 8.4 W? PXIe-2737 spec is max 100 V, 2 A and 60 W. Can we switch the pulses by use of PXIe-2737?

Solution

With a pulsed signal, you will have 2 states. Either a 84 V*2 A = 168 W signal (which is too high), or a 0 V * 0 A = 0 W signal (which is fine). This is not a place where you can multiply by a duty cycle factor. In some case, it might be possible to carefully time everything to only toggle during the low part of the duty cycle, but timing of the relays is generally 3 - 4 ms. Therefore, it is strongly recommended to pause the pulsing before toggling the relays.

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