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Electrical Engineering

Questions tagged [backup]

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For questions about backup circuits, such as a battery backup.

86 questions
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5 votes
3 answers
714 views

In our country the home batteries are on the rise. Some systems support an EPS (Emergency Power Supply). When the grid fails, it disconnects your house from the grid by a relay, and the battery ...
user2190492's user avatar
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3 votes
2 answers
275 views

Does anyone know why the datasheet (DS1339) states that proper operation isn’t guaranteed if a series diode is placed between the battery and the VBACKUP pin?
stowoda's user avatar
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0 votes
0 answers
134 views

I am working on designing a vehicle that is powered from an AC source (3x 230V). The central control of this vehicle is done by a controller operating on 24V. To achieve this, there is a 230/24 AC/DC ...
Dave__'s user avatar
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2 votes
1 answer
101 views

I was told that this circuitry is able to provide 24V when the secondary voltage (Vsecondary) is not yet present. I understand this part, as there are two Schottky diodes, D2 and D3. What I don't ...
chami's user avatar
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4 votes
3 answers
920 views

I'm powering a device—a router, to be more precise—from a central 12V DC power source (that also powers a bunch of other devices). On occasions, I need to do maintenance, which involves shutting down ...
Arseni Mourzenko's user avatar
  • 968
0 votes
2 answers
158 views

I'd like to replace an SPDT relay I'm using for 12V battery backup power switching. I'd like to use a solid-state relay, but I could not find one for the voltage range and current rating (4A). The ...
fivejeez's user avatar
  • 133
-1 votes
1 answer
42 views

How do I calculate how long my backup power supply or power bank will run an appliance?
user2231142's user avatar
  • 107
0 votes
1 answer
143 views

I have an electronic door lock that takes mains power, and steps it down to the 12V DC used for its lock mechanism and for signalling. Because it’s “fail safe” (unlocks when power is removed), I would ...
aaaidan's user avatar
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0 votes
0 answers
84 views

I am working on a circuit that needs to interface with 12 V sensors and actuators. The system is normally powered from 220 V AC and it has a 12 V backup lead-acid battery, so there will be some 220 V ...
Steven's user avatar
  • 101
0 votes
1 answer
112 views

Currently I have a battery backup circuit for a GPS device to run on automobile power source and I am trying to improve a few things. Any help is appreciated. Currently I am facing issues of negative ...
user387542's user avatar
  • 1
3 votes
2 answers
772 views

I want to use supercaps in a system for minimal power interruption backup (1-2 seconds). My systems works at - 40 to 85°C. I have seen that supercaps are usually rated for 1000 - 2000 hours at max ...
Uriel Katz's user avatar
  • 117
1 vote
2 answers
1k views

I see many circuits online of dual power supplies connected in parallel through output diodes on their outputs, to provide redundancy in case the main one fails. Usually the primary supply is an AC-DC ...
QuickishFM's user avatar
  • 642
0 votes
0 answers
67 views

We need to design a power supply for a 3.3 V WiFi-device. But there are quite some current spikes during WiFi startup. Using the design below there is a risk the 5 V (250 mA max) supply (not mine) ...
boddeke's user avatar
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0 votes
0 answers
141 views

I have a small simple circuit where an ESP32 runs an L298N driver for a single DC motor (not a stepper.) The run and direction are controlled by a simple web page with two buttons. The code works ...
WouldRatherBuildAMotor's user avatar
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1 vote
0 answers
133 views

Solar Inverters are switched off during a blackout and make that you have DC electricity on your roof while being without AC in your home. This may not be as urgent where you live, but in countries ...
wogoos's user avatar
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