# HOW TO Convert 12v to 13v

#### Usamaj

Jul 14, 2022
13
i am working on ups for the router i have some questions
1. i am using lithium battery 3s whose output when full charged is 12.6 so i need 13v to charge it i have adopter 12.22v i need to boost the voltage is there any way which transfer is best that work without producing too much heat i don't want to use xl6009 or any module ... just simple circuit.

2. 12v*1.5a= 18watt == 9v*2a = 18watt. what if i give 9v 2amp to a 12v load is it work?

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,636
i don't want to use xl6009 or any module ... just simple circuit.
Using an off the shelf step-up module will be the simplest "circuit" you can use.
what if i give 9v 2amp to a 12v load is it work?

#### crutschow

May 7, 2021
834
To increase a voltage you need a boost (or buck-boost) switching regulator.
As Harold noted, an off-the-shelf module will be the simplest and cheapest way to do that.

Jul 14, 2022
13

May 7, 2021
834

Jul 14, 2022
13

#### Martaine2005

May 12, 2015
4,891
What type? SMPS? Linear? Is it a higher voltage and regulated to 12V internally?.
Current output?

Martin

#### Usamaj

Jul 14, 2022
13
i did not know about it is there any way to check

#### Martaine2005

May 12, 2015
4,891
Not without opening it.
Is it like a laptop power supply or a phone charger/PSU? Or a heavy little walwart?

Martin

Jul 14, 2022
13

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#### Martaine2005

May 12, 2015
4,891
That’s a SMPS. I doubt you can alter it . Get another adapter with a higher voltage. Or a linear transformer. Or of course a boost converter.

Martin

#### ivak245

Jun 11, 2021
105
Have you actually measured the output of the plug pack? They may say 12VDC, but the no-load voltage could be as high as 16vdc. Then you just need to go through a variable 3 terminal voltage regulator, as long as the under load voltage is above 13 volts.

#### Martaine2005

May 12, 2015
4,891
Have you actually measured the output of the plug pack? They may say 12VDC, but the no-load voltage could be as high as 16vdc. Then you just need to go through a variable 3 terminal voltage regulator, as long as the under load voltage is above 13 volts.
The power supply shown is most definitely a SMPS.

Martin

#### CircutScoper

Mar 29, 2022
300

Pry it open and take some photos of both sides of the circuit board. It's just possible the brainacs here (not me!) will be able to suggest a workable modification -- provided you're good at soldering.

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