DC-DC converter to step up input voltage

Posted on Feb 6, 2014

This is a simple circuit which outputs a voltage which is more than the input. This could be used to power 12v or 9v devices from a 6v system, or even 6v devices from a 1. 5v battery (see below). This circuit uses bog standard parts, without requiring a magical `do-it-all` IC. You can make an ultra simple 1. 5v to 9v regulated stepup converter by us

DC-DC converter to step up input voltage
Click here to download the full size of the above Circuit.

ing a TL496 IC, a coil and a capacitor, but that`s not so much fun if you want to experiment. I`ve already built a TL496 based circuit so I started doing web searches for something that I could make that would allow more fiddling and a wider range of applications. The only unusual component in this circuit is the coil (L1). I am not going to give you instructions on how to wind "the" coil because so many different types work with this circuit. Even a small DC motor works! These are the coils I have tried so far: The 60 turn coil gave the highest output voltage but the current draw without any load was already 40mA, probably because its DC resistance is very low. The motor and hookup wire coil gave reasonable performance. The solenoid seemed to give the best overall performance. The values shown for R1 and C1 will cause oscillation at about 40KHz. You should experiment with these too as different coils may perform differently at different frequencies. When I decreased R1 to 130k the frequency increased to about 180KHz and the output voltage increased by a few more volts. Make sure C2 is rated for the output voltage. I used a 47uF 50v electro because it`s what I happened to have lying around. A higher value may give better performance with less ripple on the output. The first setup of this circuit used the solenoid and a 9v battery. The output was around 41v with no load. With the 60 turn coil, it exceeded 80v! (With a 50v...

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