Introduction: DC Boost Converter

Picture of DC Boost Converter

My first intention was to design a DC Voltage boost converter to convert 3vdc to 5vdc so that I could power my iPod or any other device requiring 5 volts to charge.  I read about oscillation circuits and boost converter circuits and combined the two.  My results were staggering when I was able to convert 4.5 volts to over 100 volts by accident.  I decided to post an instructable for this instead, for now. If you have any tips to increase the efficiency or output current please comment below, I appreciate any suggestions.

Step 1: Obtain Parts

Picture of Obtain Parts

All components can be found at RadioShack.
     
     PCB
     3 X 1.5 volt Battery Holder
     L1     RF Choke                   100 micro Henries
     R1     Resistor                      10 Ohms
     R2     Resistor                      51K Ohms
     Q1     PNP Transistor          2N3906
     Q2     NPN Transistor          2N3904
     Q3     Power MOSFET         IRF510
     C1     Capacitor                    .01 micro Farads
     C2     Capacitor                    .047micro Farads
     D1     Diode                           1N4148

Step 2: Place Components

Picture of Place Components

Arrange components as you see here or as close as possible.

Step 3: Observe Diagram

Picture of Observe Diagram

Look through the wiring diagram to see what components need to be connected to what prior to soldering.

Step 4: Solder Components

Picture of Solder Components

Solder components carefully to ensure there are no shorts, also ensure all connections are made at all points.

Step 5: Clean Up and Test

Picture of Clean Up and Test

Trim component leads and clean solder joints.  Be sure to double check connections to make sure a connection isn't left out.  Hook up battery terminals and multimeter and see what you've got!!!

Comments

Tanmay Deuskar (author)2017-10-16

Hello,

I'm interested in making this circuit however I don't have a RF choke inductor. Can a regular one work? Also can I use a bc-547 or a 2n2222 instead of the NPN transistor you used?

Thanks

Sure, 2N2222 is a better option for Q2 because its current rating (600 mA) is more adequate for the 10 ohm resistor (current up to 400 mA) than 2N3904 (max Ic "only" 200 mA).

gsmq2016 (author)2016-03-05

I would like to convert 18VDC 8A to 100VDC 2.5A

shomas (author)gsmq20162016-05-18

Even at 100% efficiency, no one can boost 18v@8 amps (114 watts) to 100v@2.5 amps (250 watts): Laws of physics, as in energy can neither be
created or destroyed.

Marcov68 (author)shomas2016-08-22

At 219% efficiency it should be possible ;-) 95% is already possible so why not exceed that. The world keeps on progressing.

shomas (author)Marcov682017-09-01

True efficiency > 100% is like a unicorn. it is nothing more mythical and does not exist. Sure, some times we have apparent efficiency that are over 100% but the extra energy comes from something else and was not not accounted for in the apparent figure. thus the difference between true and apparent efficiency

Edward Sun (author)Marcov682016-10-22

You realize that's not possible. Energy can't be created nor destroyed. Even 100% efficiency is not possible due to some energy being radiated out of the transistors as heat.

shomas (author)shomas2017-03-28

I have to correct myself, I was assuming continuous output. Watts is a measure of power, not energy. If one needs to get more power then what is put int, it could be done by storing and releasing power quickly over a shorter time. One way this can be done with pulse width modulation the output into on and off duty cycles. spending different amounts of time in each.

Over the course of an hour, a source voltage of 18v and a load that draws 8 amps will source 114 watts for each second of that hour. sourcing 114 watts * (3600 seconds, 60 seconds in a minute * 60 minutes in an hour) = 410,400 watt seconds( watt second is an expression of energy = joules). With an impossible 100% conversion, 410,4000 watt seconds of energy / 250 watts output means you can deliver 250 watts for just 1641.6 seconds. That works out to about 27 minutes and 21.6 seconds. In a world with perfect efficiency using pulse width modulation, one could convert 114 watts to 250 watts with a 45.6% on duty cycle on his output, and a 54.4% off duty cycle.

Travour776 (author)shomas2017-02-04

Agree

BrianB405 (author)gsmq20162016-12-29

First you will need to setup a tesla coil at 8hz and a very large capacitor (big vat of veg oil). This will be giving you that extra efficiency you unknowingly seek ;p

Next you will need to go ahead and setup a microwave ray in order to excite helium plasma into their "boson" particle state. Go ahead and hook this up to the big vat o' veg oil. Please note that the built up helium boson waves will need to be calmed in order to extract the energy in 'physical' form.

Note that these are alpha particles. Do not touch!

Next you will want to hook up 54 and a half (just chop 'er with a butcher knife) "C" batteries in series. This will give you that 82 volt boost and well as compensate for your missing 106 watts. Should give you a good 4 minutes of power.

Finally, sit back and enjoy!

jhonyFu256 (author)gsmq20162016-09-07

really dude!!! you made my day t hank you ;)

jayas15 (author)2017-08-18

can we increase the power of the supplied power?

if yes help me in solving it

chakrabarttyaditya (author)2017-08-14

How to convert 6V to 12V by this process. Please help me out.

IamNoob (author)2017-07-11

I know this is stupid question but can I put 5VDC instead of 4.5VDC?

Andrea Antonio Gallo (author)2017-05-01

Congratulations on the job, I would need a 12V to 80V, you can help me.

Lima79 (author)2017-03-03

I don't know where was i(: how did i missed this. Still having problem
with my 45-0-45VAC transformer, still having a short in the primary
coil winding, no idea. I think it will be better building this one
instead if i can get a 45-0-45VDC, anyways thank you good brother for
the share.

Muhammad Asim khan1 (author)2016-11-02

Hi, I need your help..

Can I DESIGN HIGH VOLTAGE DC POWER SUPPLY (50KV) from 220 V using boost converter....??

Kindly Guide me....

WasimA22 (author)2016-09-28

1- Can this circuit convert 12v & 22amp to 100v and 2.64amp without any heat sink??? Please answer if you are confident

2- and how to step down. This circuit is really simple

3- Is this tightly regulated voltage?

Porkchop559850 (author)2016-03-15

Need to step up a 12v 300amp power supply to a 18v 300amp power supply without changing the power supplies inside it

shomas (author)Porkchop5598502016-05-18

Even at 100% efficiency, no one can boost 12v@300 amps (3600 watts) to 18v@300 amps (5500 watts): Laws of physics, as in energy can neither be created or destroyed.

jhonyFu256 (author)shomas2016-09-07

seen so many posts like this today!! I am just staggered because in my mind it felt like this was a piece of knowledge everybody possessed!!

BETTINGT (author)2016-07-19

what should i change to make 1.5v to 5v booster

BETTINGT (author)2016-07-19

what should i change to make 1.5v to 5v booster

alexmd6279 (author)2016-06-05

How can i boost 5VDC (from Arduino microcontroller) to 12VDC(motor)

01MadMan14 (author)alexmd62792016-07-17

If this is still relevant, instead of using the Arduino's output of 5v, I would wire a DC-to-DC step-up converter directly from the power supply you're using to power the Arduino (9v Battery?). This should be more efficient than trying to step-up from 5v. There are a few good converters on this website and many more on others. Then you would wire the motor through a transistor or similar system and use the digital signal from the Arduino to control the transistor, thus powering the motor. Another option is a motor driver module, which can also be made.

If this goes beyond your current situation, it is possible to buy both converters and motor drivers/controllers. It would reach the same effect in a more modulated way, but you should be reasonably sure that it would work.

If this is a fixed object, you could also look for an old computer power supply, from which you could power both the Arduino, motor, and pretty much anything else, without worrying too much about amperage. These things are not terribly mobile though and maybe a bit overkill at time... Nevertheless, convenient.

kwphysics (author)2016-06-11

I've been studying this circuit for a couple hours now trying to understand how it works. I understand that the input DC is modulated to run the gate on the MOSFET and rock that inductor, but how is the coupled transistor pair (PNP/NPN) doing that? I imagine an astable multivibrator configuration would do the same thing, but how does this equal that? Any links or references would be very much appreciated!

sinas1 (author)2014-11-06

How can i boost 9VDC-350ma to 9VDC-2ampre

aji hanif (author)sinas12015-12-15

you can reduce resistance, since V=I*R, so if you reduce resistance the current will go further than 350mA, the way you can reduce resistance is by...well removing resistor, or by make your resistor parallel with other resistor. since battery or other voltage source (real life) have internal resistance, you can parallel it with one and another ( but not all voltage source can be parallel with one and another) CMIIW

shomas (author)aji hanif2016-05-18

Can not get more energy out than is put in. Laws of physics and all. His units were given in volts and amp, but it were possible to build a booster to his specs, then for each second it runs it would create more energy than it consumes.

aji hanif (author)sinas12015-12-15

you can reduce resistance, since V=I*R, so if you reduce resistance the current will go further than 350mA, the way you can reduce resistance is by...well removing resistor, or by make your resistor parallel with other resistor. since battery or other voltage source (real life) have internal resistance, you can parallel it with one and another ( but not all voltage source can be parallel with one and another) CMIIW

carroty (author)sinas12015-07-22

Next Level impossible bro. use less resistance in your circuit and you will get more amps out of your battery or whatever you need to do.

valveman (author)sinas12015-04-21

You can't get more power out than you put in.

Jimmacle (author)sinas12014-11-09

You're trying to change 3.15 watts (V*A) of power into 18 watts of power which is impossible. You'll need a power source that can supply at least 18 watts of power.

aalejo (author)2015-01-06

I have some question it is the thing. Can my power amp rates 16 volt can power it by your design??? Pls answer me

aji hanif (author)aalejo2015-12-15

it might can power it, however the noise from this circuit will ruin your music though . im suggesting you're using more that 16V then using linear regulator, idk though, im building my diy amp and it was very sensitive to noise

shomas (author)aji hanif2016-05-18

capacitor inductor capacitor (pi filter) will clean up a lot of noise. The second capacitor needs very low ESR rating for best performance from the filter

mikee212 (author)aji hanif2016-03-19

In are if constant line? Dozens! Look more in wire two. Aloe vera.

Source: stairs.

MohamedA210 (author)2016-05-04

please i made this circuit but it can only boost high voltage what if i need to boost a small voltage like that is out of a paltier???

shomas (author)MohamedA2102016-05-18

Your issue is two fold. One, by itself the voltage is too low. bump it up with more in series before you boost it. two, the power produced is extremely low and such that drawing even a modest amount of current drops the voltage to unusable levels. You need consider this last point when pairing it with a load, because your not going to pull 5 watts from a device that produces less than a watt.

mr electro (author)2016-05-17

You can greatly increase the efficiency of a boost converter by using a fast switching Schottky diode like a 1n5711. If it is a low voltage low current application, you can even use a Germanium diode such as a 1n34 or 1n60 as I did in my Instructable (Solar Powered Battery Charger) a few months ago. The increase in efficiency is due to the lower voltage drop across the Schottky or Germanium diodes.

ganban (author)2016-03-28

I want to convert 9v to 5v with the ratio of 4.5 amp.How can i convert it,can you please give me instructions.

J0SHUANIC0LL (author)ganban2016-04-14

All you need is a 5V regulator, 4.5 amps is lot though, you need a 25 watt 5V regulator, or 25 i watt 5V regulators.

ChantalL7 (author)2016-04-09

how much is the amperage on this design

pityukecske (author)ChantalL72016-04-09

200 mA maximum output current. 1N4148 isn't a very good choice for a power converter.

ganban (author)2016-03-28

I want to convert 9v to 5v with the ratio of 4.5 amp.How can i convert it,can you please give me instructions.

ArmandC7 (author)2016-03-23

is it possible to covert say 50-100mv to 4 or 5v?

MaseM8 (author)2016-02-20

I need to convert 12v 7.2A lead acid battery to 450V, to charge a 450V 15000uF cap. How can I do this?

Grey_Apple (author)MaseM82016-03-01

Quick answer: With a step up booster, like what OP made, but stronger.

pallc (author)2016-02-26

I was wondering if, with a diode circuit and large enough capacitor and maybe an LED to turn on once capacitor is charged ran after a 5V 1A or 2A USB output that has 200000mAh capacity battery source, I could make a 12-14V output to use as an emergency car battery starter with the car battery that is clamped in parallel? If not, how would you make such a device? Was thinking of another back-up emergency use for the 200000mAh solar power battery bank: http://www.ebay.com/itm/200000mAh-Solar-Power-Bank...

Thanks in advance and awesome instructable!

purushoathn (author)2015-10-16

how can i convert 100mv to 6v

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