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Capacitor safety vent audible sound

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ogden:

--- Quote from: Siwastaja on February 08, 2021, 04:59:55 pm ---wraper has a point though, even if you monitor the trivial motor controller DC link, the big picture will have dozens of power supplies with dozens of DC links that are not trivial to monitor.

--- End quote ---
Most modern electronics devices has so many components which could fail that monitoring health of everything is impractical. Isn't that bloody obvious? We suposedly talk about devices which are required to meet some reliability and/or safety standards. We supposedly do not talk about generic SMPS of somebody's generic desktop PC. Think of hi-rel & hi-cost medical or industrical devices.

Siwastaja:
Yes, but even that motor inverter may have a few auxiliary supplies in it (maybe three for isolated high side gate drive, one for logic board, and so on), and if you think about other industrial modules in the same system, all critical for the complete system to function, the count quickly goes to dozens. These small supplies are relatively harder to monitor because they just use off-the-shelf control ICs, yet failure in any of those is as bad for the availability of the system than the failure in the big inverter power stage.

ogden:
If you say that dozens of small supplies have same reliability as hi-power supply of motor controller, then you are not doing right design decisions.

wraper:

--- Quote from: ogden on February 11, 2021, 05:26:39 pm ---If you say that dozens of small supplies have same reliability as hi-power supply of motor controller, then you are not doing right design decisions.

--- End quote ---
Wut? Why they should be more reliable or less reliable? Not to say it's hard to estimate what will be the real weak point in the design unless you knowingly cheapen out something too far. Regarding to safety, if your design bases safety on measuring ripple on capacitors, you're a moron. If it's say used in elevator motor driver, then safety is achieved by completely different means. Like contactors disconnecting the motor if abnormal condition is detected, breaks activated and similar. The design must be inherently safe.

ogden:

--- Quote from: wraper on February 11, 2021, 06:08:22 pm ---
--- Quote from: ogden on February 11, 2021, 05:26:39 pm ---If you say that dozens of small supplies have same reliability as hi-power supply of motor controller, then you are not doing right design decisions.

--- End quote ---
Wut? Why they should be more reliable or less reliable?

--- End quote ---
Different types of capacitors maybe? :-// Small point of load supplies can happily live with ceramics chip capacitors.


--- Quote ---Regarding to safety, if your design bases safety on measuring ripple on capacitors, you're a moron.

--- End quote ---
LOL :) Thank you for pointing out misuse of term (electrical) safety device. It is failure detector at best.

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