How to make a mini 12 V uninterruptible power supply for a router

How to make a mini 12 V uninterruptible power supply for a router

If there is a power outage at your home, this does not mean that the incoming electrical or fiber optic cable has lost internet. Most families have a central router at home that distributes the Internet to all mobile devices in the household. When the lights are turned off, it becomes especially sad and boring. To ensure that the Internet always works, I propose to assemble a simple uninterruptible power supply for it, which will ensure that the router operates offline for about three hours.

Will need


  • Batteries 18650 series - 2 pcs - .
  • Built-in voltmeter - .
  • Boost Converter - .
  • Charging module with 2S BMS protection - .
  • Power supply 9 V 2A - .
  • Plastic body - .

How to make a mini 12 V uninterruptible power supply for a router

Making a mini uninterruptible power supply for a router


It was decided to take 18650 batteries from a failed laptop battery.
Let's disassemble the body.
How to make a mini 12 V uninterruptible power supply for a router

We check that the voltage of each battery is not below 2.7 V, otherwise it will not work. Only two elements are needed.
How to make a mini 12 V uninterruptible power supply for a router

We charge the batteries to ensure they are fully functional.
How to make a mini 12 V uninterruptible power supply for a router

We take a plastic case. We cut holes on the side for the power supply socket and switch.
How to make a mini 12 V uninterruptible power supply for a router

To prevent accidental short circuit of the batteries, which is very dangerous, the connection will be made through fuses.
How to make a mini 12 V uninterruptible power supply for a router

We insulate everything with heat shrink. We fasten the elements together with electrical tape.
How to make a mini 12 V uninterruptible power supply for a router

Cut out a window for the voltmeter.
How to make a mini 12 V uninterruptible power supply for a router

How to make a mini 12 V uninterruptible power supply for a router

We glue it with hot glue and use it to insulate the contacts on its board so that an accidental short circuit does not occur.
How to make a mini 12 V uninterruptible power supply for a router

We glue the charging controller to the batteries using double-sided tape. Solder the wires to the board according to the diagram.
How to make a mini 12 V uninterruptible power supply for a router

How to make a mini 12 V uninterruptible power supply for a router

Uninterruptible power supply circuit on modules


How to make a mini 12 V uninterruptible power supply for a router

We assemble a power supply circuit.
How to make a mini 12 V uninterruptible power supply for a router

We solder a capacitor to the output to eliminate micro-surges and prevent transmission of the operating frequency of the converter.
How to make a mini 12 V uninterruptible power supply for a router

How to make a mini 12 V uninterruptible power supply for a router

Using a variable resistor on the boost converter, we adjust the output voltage to 12 V to power the router.
How to make a mini 12 V uninterruptible power supply for a router

We assemble and put it on charge.
How to make a mini 12 V uninterruptible power supply for a router

Device operation:


Previously, the router operated from its own 12 V unit. We replaced it with another, 8.4-9 Volt - this is necessary for the operation of the entire device.
So, with a working network, the power supply converts the mains voltage to 8.4-9 V, then it is supplied to a boost converter and a balanced battery charge controller. The boost converter raises the voltage to 12 V and supplies it to the router. The router is working. As soon as there is a power outage in the network, the charge controller switches its operation from charging to consumption, and a voltage from the batteries of 8.4 V appears at the output of the boost converter (if they are fully charged). And further operation of the router will be carried out from them.
Over time, the batteries will discharge and when their voltage approaches 2.7 Volts, the controller will turn off the elements, preventing them from being completely discharged.

The result of the work is as follows:


When the router consumes a current of 1 Ampere, the approximate operating time of the uninterruptible power supply is 30 minutes.
How to make a mini 12 V uninterruptible power supply for a router

If the router consumes 0.5 Amperes, then the power will last for an hour and a half.
How to make a mini 12 V uninterruptible power supply for a router

We measure how much our router consumes in real life.
How to make a mini 12 V uninterruptible power supply for a router

Approximately a quarter of an Ampere, and therefore the source will ensure stable operation of the router for more than 2.5 hours.
Such a mini uninterruptible power supply can be used not only for a router, but also for a router, for a wired telephone station, for powering a removable hard drive, and for other purposes.
How to make a mini 12 V uninterruptible power supply for a router

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Comments (8)
  1. Konstantin
    #1 Konstantin Guests 19 December 2019 23:59
    2
    They forgot to power the media converter (5v), and without it there will be no internet 😁
  2. Ivan
    #2 Ivan Guests December 20, 2019 04:53
    2
    Router and router are the same thing.
    The first is in English, the second is in Russian.
  3. Yuri
    #3 Yuri Guests 20 December 2019 13:09
    2
    In such cases, I plug the cable into the laptop and distribute the Internet from it. This is much cheaper than similar structures, and the light is usually repaired in no more than 2 hours.
    1. Paul
      #4 Paul Guests January 29, 2021 11:04 pm
      1
      Optics for a laptop?
  4. Sergey K
    #5 Sergey K Visitors 6 January 2020 18:29
    3
    The idea is interesting and useful! But it’s strange why the voltage of two batteries was chosen? Here it would be more logical to have three and power it directly from 12.6V, and supply 5V to the media converter from the converter.And why save money - there were 6 batteries to disassemble, use them all, your pocket doesn’t have enough reserve ;)
    On the other hand, I was convinced from my own experience that if there is no light, then nothing will help, no matter how much you power it from an uninterruptible power supply; out of a dozen outages, it’s good if something moved in the optical fiber once;) And for such cases, the mobile Internet is simply distributed through a mobile phone with an Android .
  5. Vital
    #6 Vital Guests 17 September 2020 09:29
    3
    Kind! What kind of homemade ammeter do you have? Can I have a diagram?
  6. Electrician
    #7 Electrician Guests 11 November 2020 02:35
    0
    when they turn off the power, the provider’s equipment will also turn off, useless gadget
  7. Vladimir Borisovich
    #8 Vladimir Borisovich Guests 17 September 2021 18:56
    0
    Cool, though a box with batteries and 12V output costs 500 rubles on Alika))