Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [redundancy]

38 questions
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3 answers

Dual-SIM phone, do they use 2 GSM modules ? Anyone has high level schematic?

As an slight extension of my project, I am trying to see if I can improve connectivity resilence by using a dual-SIM approach. Dual-SIM phones (or Tri-SIM, quad-SIM phones) are quite popular in many developing countries, and AFAIK, most are based on…
bdutta74
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Yields in DRAM and other Massively Redundant Processes

I'm right now combing the electrical engineering literature on the sorts of strategies employed to reliably produce highly complex but also extremely fragile systems such as DRAM, where you have an array of many millions of components and where a…
Mephistopheles
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Two identical DC power supplies in parallel for redundancy?

I'm trying to design a power backup system for my saltwater aquarium. In short, the system will be powered by a 12VDC power supply while the mains power is on. On power failure, the system will automatically switch to a battery source until the…
user108567
5
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2 answers

Operation without power: Passing analog video

Okay, the title sounds odd, I'll admit. I need my project to work without power. That is, a complete power failure may happen, and no additional power (such as a battery or supercap) is available mainly due to size and cost restrictions. The ground…
Thomas O
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Is it reasonable to use two LDOs in parallel for redundancy?

I'm trying to have redundancy in part of my design. I want to use two LDOs in parallel before an OR-controller (specifically, an LM66100-Q1.) One LDO is enough to feed the system, so it will not be overloaded. If one LDO fails, or one LDO has a…
Indexer
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2 answers

Fail-safe half-bridge

I've been thinking about this for a while now, to use in the powered jaw of some publicly accessible, human-sized animatronics. I want a lot of force to be available to move quickly, and to demonstrate some decent bite strength, all with feedback…
AaronD
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Triple Modular Redundancy w/ Majority Voting when a microcontroller fails

In a simple majority voting system, the majority input values will be the output, as shown below. (source: 6502.org) However, how does one deal with scenarios where one or two microcontroller fails? Also, how do we overcome the problem of having…
Olivier
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How to create a triple redundant clock tree in FPGA manually?

I am exploring a range of techniques to implement TMR clock trees as part of a global TMR design (all resources including i/o pins, clock trees, reset trees, logic and registers are implemented with triple redundancy). As I am not interested in…
Happy Techy
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Does my ORing or Ideal diode Work or not?

Does anyone have experience with parallel switching of power supplies like I do here seen depicted in the schematics below. I have designed and simulated an ORing or ideal diode based on simple components. Its based on a PMOSFET and a LM393 or LM339…
wogoos
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Fault tolerant power supply design

Lately I've been really interested in the concept of fault tolerance. As it relates to power supplies, I'm curious how you'd maintain power to downstream components in the event that one or more of the components (e.g. a regulator) in one of the…
jonnyd42
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Power source redundancy for low voltage application

I am trying to design a circuit that u would like to be as reliable as possible. One feature I would like to add to my circuit is an additional voltage regulator for redundancy purpose. The problem is that the voltage contains a 1.2 V rail that…
user127515
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Do residential smoke alarms monitor their sounders? If so, how?

This is an open question, and wondered if someone out there might have the info on a typical fire alarm architecture, such as for this generic alarm: Image source : LABChomeowners Obviously as much as the detection of smoke is critical, it is no…
midnightBlue
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Using a relay to switch between 230VAC inputs

I have two mains power inputs (in case one fails, the other is likely to still work), but the device only has one power supply, so I decided to use a relay to switch between the inputs (the device should be able to cope with a momentary interruption…
Pentium100
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Majority Voter for complex data

How is a majority voter for complex data implemented? If there is only one integer value which should be compared you can use a discrete circuit but how does it work for multiple datasets and floating values which could be slightly different because…
BigStorm
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Automatic transfer switch VS Using a Reversing Contactor with Circuit Protection

We have a an industrial control system that utilizes a 480VAC 3 phase 10 Amp service. For redundancy reasons, we wanted to add an automatic transfer switch to the system to switch between two redundant power sources (each are 480VAC 3 phase). …
Greg
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