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Topic: Voltage step up alternatives (Read 1 time) previous topic - next topic

olof_n

Oct 27, 2012, 04:49 pm Last Edit: Oct 27, 2012, 05:43 pm by olof_n Reason: 1
Hi!

I need to build a boost converter (step up to 30-40V 100mA 20mA to drive a IV-18 VFD) and have found three alternatives.

Alt 1.  555 IC, Inductor, Diode and capacitor (http://www.benjscott.com/2009/07/555-boost-converter/)
I tried alt 1 this week and it worked fine. By modify the frequency on the 555 I could change step up voltage easy.
First try I got 120V from 5V :)

Alt2. MC34063
Bought 10 pieces of MC34063 from ebay. Never used them but should be able to work as a step up converter to 40V.

Alt3. Voltage tripler circuit (http://www.electronics-tutorials.ws/blog/voltage-multiplier-circuit.html)
If I could find a 12v AC/AC adapter, I could triple the voltage to 36V DC.


What is the pros/cons with the three alternatives?

/Olof

dhenry

1: cheap and stable;
2: cheap. but not as efficient;
3: not workable for your purpose.

You can also configure your arduino into a boost controller.

olof_n

Thanks for the quick reply!
That is good because alt 1 was very easy to build.

/Olof

James C4S

I'm not familiar with the current requirements of the VFD, but the 555 solution is only ideal if the load never varies.  The MC34063 is a regulator and will provide a stable output as load as the load is within its specs.
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michael_x


You can also configure your arduino into a boost controller.

By simulating a 555 (oscillator with variable frequency) ?
If there's more about it, can you please tell a bit more?
Controller means regulating, right? Is the Arduino ADC fast enough to work in a closed loop in that area?

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