Electronics > Projects, Designs, and Technical Stuff

DC to AC converter

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I've been tasked with designing a DC to AC converter, basically a driver circuit followed by a H bridge,

Naturally my first thoughts fell to a PIC but i will have to "manually" program the 50 Hz square wave in as on a 4MHz clock the lowest PWM output is 245 Hz unless of course there is a pic with less than 4MHz internal clock ? 12F683 maybe ?

before I go design happy is there something I'm missing ? perhaps a chip dedicated to this without the hassle of programing a PIC ? can you get adapters to program SOIC parts ?

Their talking about having the thing made for us so all i have to do is design (and presumably prototype). I did suggest making it ourselves but that scares them (it's nice to be able to blame your supplier !)

A DC to AC converter is called an inverter.  They are pretty well documented.  Maybe you should try to find out about inverter topologies.

I have a few questions:

Input/output voltage/current?

Does the frequency need to be accurately controlled?

Is isolation between the DC and AC side required?

If it's just a standard inverter i.e. 12VDC to 230VAC then it's probably more economical to just buy an off the shelf unit.

I assume square wave is fine but you need to beware that it can destroy some appliances or just make them behave erratically.

If it's very low power and the frequency isn't important, you can configure an h-bridge to form an astable multivibrator which is very simple, no MCU required, just four transistors, two capacitors and some resistors.

this is just 24V DC to 24V AC basically a H bridge plus driving circuitry and MCU power

Care to mention the current and the application?

It's possible that DC might work fine.


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