Basic step up dc-dc converter

Posted by Ilias-Man On Friday, February 24, 2012 55 comments

This is a basic circuit of a step up DC-DC converter which the output voltage is more than the input, the circuit could be used to power a 9v or more devices from a 6v or even a 1.5v battery, charge batteries (3-12v) with 1.5v solar cell...
The circuit uses an oscillator using Schmitt trigger, all types of oscillators works, one transistor (Ex: BD139 or similar), resistors, coil (many different types of coils work even a small DC motor works! or you can wind 60 turn on ferrite)




R1 and C1 determine the oscillation frequency, different types of coils perform differently at  frequencies changes.
I used 5v input and toroid ferrite, the output exceed 60v (no load). The output voltage will drop as the load go higher.

Other types of oscillators can be used:


Other one to use see here: Simple rectangular oscillator

7812 or 7805 regulators can be used to stabilize the output voltage. (remember not to exceed the maximum input voltage)


Thanks

55 comments:

toro said...

L1 = uh ?

doc-out-of-the-box said...

can I ask a question?
I need a 12v DC to 120 V DC transformer, to convert solar power (from batteries)
To power a lathe motor (120vDC). The system is about 1000w
Do you make such a device, or do you know someone who does?
Thanks
CHIP Moses

Unknown said...

Isn't the 7414N an IC? With multiple pins! Can you show how you connect them in the circuit?

Unknown said...

What is the L1 value here in the circuit?

Unknown said...

a very useful circuit

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Unknown said...

How much current can these circuits deliver?

Unknown said...
This comment has been removed by the author.
Unknown said...

I inserted resistor R=9 Ohm instead of L1 and I got dc-dc converter from 3 V to 1.5 V

Unknown said...

Can I use a 1.5vdc cell to fully charge a car battery?

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Badhri Media Creations said...

What is the inductance value???

Bambang Prayogi said...

Is mosfet more better as a inductor driver?

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