Micro UPS (UPS) for the router. Which is easier to buy or make?

Question

Batteries

Reminds me of the late 90s. I recently moved to a small town near Moscow and in our house there are constant problems with light. It blinks very often and sometimes turns off for an hour or two.
For desktop PCs, I bought uninterruptible power supplies, but with a router it’s more difficult. It is far away from my computer. I don’t want to drag the network wire from the UPS to it across the whole room. Buying a separate large UPS is also not camille. However, due to short power failures, it hangs, and because of long ones, it simply cuts off.
And I had an idea - and not whether to make a separate “microUPS”. It's like a little box that has an entrance and an exit. Insert the wire from the power supply of the router into the input. Inside the box is a battery charger and the batteries themselves. while there is voltage at the input, the router is powered directly from the computer, as soon as it disappears - from batteries. Perhaps for this you will have to make a simple impulse switch. For the sake of fun and for versatility, you can make an automatic machine that remembers the voltage of the power supplied to it, and when it disappears, it outputs exactly this voltage from the controlled pulser. And voila, when the light is cut off, you can easily access the Internet even from mobile devices!
In this regard, I have several questions.
1) Has anyone seen such devices on sale?
2) Would you buy such a device?
3) Or maybe you would like to assemble such a device with your own hands and it will be interesting for you to read about how to do it on Habré?
Thank you in advance for your opinion, it is very important to me.

Answer 1

If this is a small router, I would try to power it through a USB battery (power bank). In many routers, the power supply is standard 5 volts.
You just need to look when buying a battery so that it can give current from the network when charging.

Answer 2

Look in the direction of PoE (PowerOverEthernet)
and either fence off your garden using the Google + brains + soldering iron method - the standard is open and there is how to supply power to Google on the Internet.
Or take a ready-made, able to work on PoE WiFi Router / AP and a switch that can send PoE to the port. But a switch with PoE output will be significantly more expensive than a similar one without PoE.

Answer 3

I would take a classic offline UPS with a 7 Ah battery (1500 r + 15 minutes of work to unsolder the resistor and turn off the "Green Mode" which prevents the UPS from powering a light load).
Only redundant power supplies for burglar alarms are suitable for your exact requirements from ready-made devices for sale. They give out, say, 12 V, 3 A. But they are hardly cheaper than a UPS (although they are structurally simpler).

Answer 4

POWERCOM WOW 300, 300VA as one of the options. But here there are not very good reviews about it, besides, it is without control (which is critical if you have a router on a PC architecture and can communicate with a UPS). Therefore, for this task, I simply took the APC Back-UPS CS 500 UPS + IPPON BK112 surge protector with an IEC320 input plug (For UPS).

Answer 5

A battery of the required voltage and power is assembled and, through a diode that can withstand the maximum current consumed by the router, it clings parallel to the standard power supply. The same diode must be included in the open circuit between the power supply and this very battery so that it does not sit through the output circuits of the power supply when it is turned off. This is the simplest - if done without charging. With charging circuits it will be much more difficult.

Answer 6

Or here , they write what is on 3.3, 5 and 12V

Answer 7

I think something like this will suit you: www.inels.ru/ib29item994.html

Answer 8

It is very simple to make, there are a lot of ready-made components, but ready-made UPS for low voltage with recharging for reasonable money is not a fact that you can find it. Although the money in any case will have to spend. Here is my homemade version: bovs.org/post/136/istochnik-bespereboinogo-pitaniy... It will cost about $33 + the price for the battery (depends on the capacity, 7.2 Ah is approximately $20)

Answer 9

Thanks to everyone who replied, the issue has been resolved.

Answer 10

lithium battery two 3.7V each
Stabilizer 5 Volt - microcircuit 7805
Charging through a native power supply - through a current-limiting resistor.
Elementary.

Answer 11

For example like this .

Answer 12

And what prevents you from making a tap from a regular UPS directly from the battery, making undervoltage protection, and that's it?

Answer 13

Not long ago, I myself switched from preg_replace to preg_replace_callback.
function($params){ return trim( $params ); }

Answer 14

You can once again update the question - what are you talking about?
Nobody replaced preg_replace in php5.5 anywhere. How it worked and how it works. The e modifier has been deprecated, but you don't use it.