1-to-3-phase converter (1)

The unit described in this article converts the single-phase mains supply to a 3-phase voltage, which can be used to control small three-phase motors rated at up to 725 W, irrespective of whether these are synchronous or induction types.

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Discussion (0 comments)

Emil Almberg 6 years ago

I remember that this construction was quite controversial at the time.
There was much talk that the GAL / PAL circuit was sold expensive from Elektor.
An article showed its internal design, I can not find, can Elektor help with it?

ClemensValens 6 years ago

This is a project from way before the open source movement. At the time we didn't always have the source code for every project. Authors kept it to sell the programmed devices themselves. This was such a project for which we never had any source code. Times have changed since and today we only accept & publish projects when we are allowed to divulge the complete source code.

Emil Almberg 6 years ago

Thanks for your reply.
I still have 2 questions beyond that.

How did the programmed devices actually work?
Because it is closed code, this information is lacking in the books about electronics.
We can read lots about different ways to drive motors, how to program processors and so on, but how to trick out 3 phases from a cheap microprocessor without PWM outputs are missing in the books!

The second is why Elektor does not publish complete scans of their magazines.
Lots of info is missing, such as contents lists, editorial, and letters from readers.
Had it been, or if people who have the magazines do not sell them so expensive, I could have checked the above myself ...

ClemensValens 6 years ago

The answers to your questions are:
1. You are asking about a project from almost 25 years ago. The people involved with the project in 1994 either have left Elektor or do not remember. The 80C535 has four PWM outputs, so it can do "standard" PWM control. According to the article the MCU uses a large look-up table to avoid the maths.
2. A DVD with all the scanned magazines from 1990 through 1999 is available in our shop: https://www.elektor.com/dvd-elektor-1990-through-1999