Questions tagged [redundancy]

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Fault tolerant power supply design [closed]

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 ...
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3 answers
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Why do we not see multiple or parallel DC PSUs?

A friend mentioned that his home router had blown its 12V PSU recently and had to be replaced. That got me wondering - Servers and routers can have isolated dual PSUs for exactly this condition, but ...
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Use of memory array redundancy for performance/power

Providing redundancy in memory arrays is a common technique for increasing yield in the presence of defects and variability. Since yield in practice includes binning for performance and power ...
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1 answer
42 views

Dual Power Source for single output?

In the world of USB, there's a type of cable with dual male head for 1 single female head, like this in below picture, while 1 head is for data+power and the other for power only. I have tested it ...
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2 answers
216 views

How to combine two 48 V DC power sources for redundancy?

CONTEXT: I am building a new system to power my servers rack. There will be 2 separate LifePo4 battery packs of 48 V 50 Ah, each with their own charger connected 24/7. This will act as a UPS. From ...
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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 ...
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2 answers
368 views

Maximum message size for polynomial CRC-8 0x07 and hamming distance = 3

I am looking for maximum message size for my CRC-8 0x07 polynomial for Hamming distance = 3. Do you know some website with these types of information? Or possibly, do you know how to calculate it? I ...
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3 answers
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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 ...
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ORing controllers

I am planning to use ORing controllers in my battery applications for N+1 redundant power supplies. But I never used them till now. I had some doubts regarding its usage. I see some ORing controller ...
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1 answer
160 views

How to automatically switch to backup outlet if power goes away? [closed]

So I have two 220V outlets side by side. One of them has power all the time, the other is unreliable but has cheaper power. I'd like a device that uses the unreliable when power is present but ...
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Parallel Power Supplies

I have an application where we are supplied 24VDC but need to drop that down to 5V for some of our control circuitry. For DFM reasons, we are limited to buck converters that can only safely supply 3A; ...
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67 views

Redundant Battery and Chargers Behaviour

I am designing a circuit for a high powered LED that needs to have a redundant battery power supply. The LED is around 380W and nominal 24v so draws around 16A when lit. The LED will flash for up to a ...
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558 views

Redundant DC-DC converter (parallel)

I am building a flight computer for a sounding rocket. I want to include redundant power supplies - in other words: parallel DC-DC converters. What do I need to consider in order to do this? (is my ...
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1 vote
0 answers
49 views

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 ...
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-1 votes
1 answer
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Redundant system question

so in short. I am building a redundant system of multiple atmega micro controllers. The way it works is that they are all connected to a single bar, when the system is booted, the first micro ...
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redundant output pins from MCU

I am analyzing a board with safety considerations. In one part of the circuit, PB0 and PB1 of MCU have been logical anded using an IC (PB0 && PB1). Does anyone have faced with such ...
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2 answers
240 views

Low cost power supply redundancy

I'm looking at coupling the output of two computer PSUs, driving a fairly stable high power project (around 300-400W peak) most likely using all output rails (12V, 5V, 3.3V) all well within the rated ...
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Fuses in redundant PS system

Are the fuses required for a redundant power system, which takes power from a battery? If yes, how to calculate the characteristics? I am trying to isolate the faulty PSU, not the load. Load must ...
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1 answer
1k views

Can one battery bank be connected to two static UPS devices?

To make a redundant static uninterruptible power supply (UPS) configuration such as pictured below, I have seen warnings in UPS manuals that each UPS is to be connected to its own battery bank. But ...
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-1 votes
3 answers
364 views

Why triple output in every 230v -> low voltage DC power supply? [closed]

Why do all 12v power supplies produce triple output? All power supplies that I see at Amazon www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=12v%20power%20supply%2030a or ...
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Parallel ATX Power Supplies - for more power and redundancy [closed]

I wanted to ask the question about two parallel power supplies. I was asked by a friend if these would be a good idea Add2PSU At first thought it looks very simple and good idea to connect 2 ATX PSUs ...
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Share same input with 2 different 32AVR Microcontroller

I'm developing a circuit with two warm-redundant micro-controllers. Each uC has to read I2C, analog and digital signals from the rest of the circuit. Should I route the signals directly to the two ...
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7 votes
3 answers
13k views

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 ...
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1 vote
2 answers
5k views

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 ...
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Failover Management from AC to DC and DC to DC

I'm working on a project that has a high availability requirement. As such, I must maintain a power supply output of 12vdc ~1a (ideally 13.5vdc ~35a). The 1a option will sustain the core equipment, ...
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2 votes
3 answers
866 views

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? ...
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redundancy checks and protection on monolithic and MMICs

I am using the ISL8026A chip for voltage regulation from 5 to 3.3V. The datasheet is - datasheet. Now, this is merely an example circuit. Now, I would like to design a power supply for a hi ...
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1 vote
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How can I add redundancy to the flyback diode protection across an inductive load?

Dear StackExchange users, I want to add redundancy to a flyback diode system that is protecting an N channel MOSFET from flyback of an inductive load but I don't know how to accomplish this! I am ...
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1 vote
0 answers
108 views

Redundancy in power supply [closed]

How is redundancy of power supply from converters done in satellites? can anyone explain with complete details.Is it possible to get the actual design from power system of any mini-satellites ? Is the ...
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1 vote
2 answers
1k views

How to do redundancy for a DC/DC converter? So that if one of the converters fails the other gets switched on

I have a DC/DC converter that gives 3.3 V output.In our system it is the most important part.So we need a redundancy for this.So that if one of the converter fails the other should automatically get ...
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10 votes
1 answer
784 views

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 ...
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1 vote
1 answer
154 views

using double powersupplies

I have 2 computers (home PC's). Both are connected to the internet through a router/switch. The router is always powered, regardless when one (or both PC's) are going standby. Idea is, to power the ...
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2 votes
1 answer
752 views

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 ...
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1 vote
2 answers
10k views

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 ...
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22 votes
3 answers
6k views

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 ...
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5 votes
2 answers
317 views

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 ...
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