money maker circuit, just design it (and find right buyer)

--- If your idea is that good, and since you're flush, you should spend a few bucks and have your legal team and theirs work out an equitable arrangement.

But, first things first, you should follow your own advice and at least file for a patent so the date of concept is recorded and the work is in the mill.

No on those terms.

I think you misunderstand the terms. I believe Robert is offering it for free to anyone would would like to develop the idea. I don't think you even need to make any commitment, just don't reveal the idea to others who might give it to the big players.

NO "usual"; lots of bargaining to get the agreement.

Is there such a thing? Even if (and i say _if_) you were close i would not say ...

Dern! They should be green....for the money..

A wise investor puts money on things that have a high probability of working, not on an idea.

Not that; prolly been tried. What i have in mind AFAIK has not been done.

Well, please send me an e-mail and i will disclose. Then shake your holy water on/off it.

Someone in this NG has already e-mailed me; we shall see. But all are welcome within the conditions i set.

Let us wait and see who starts posting here for advice on kW/kV power supplies into changing loads :)

piglet

The idea was a switcher as replacement to the big HEAVY transformer seen in all microwave ovens.

Tim Williams of Seven Transistor Labs, LLC found the following:

Microwave Oven Inverter- Power Module (brand new) Panasonic, e-bay #220943086526 from eBay international sellers.

DANG! I thought i had a "winner" idea.

Ya can't win 'em all, Bob. :^)

Yeah, just make sure and do a thorough googlin' about an idea... chances are it's already been done, but you never know unless you look.

"Inverter microwave" and "switching supply microwave" turn up interesting results, with patent 5171949 (1992!) being the first such hit.

Better luck next time, I guess :)

Tim

The latest of solid state microwave ovens completely eliminate any big heavy transformers.

Thus, the problem no longer exists.

For ummm some value of 'latest'.. Panasonic has had their inverter microwave ovens in production for 5 or 10 years now. Also licenced to GE. They're a fair bit lighter than the old (highly optimized) transformer types (which used very little iron for the power they put out- cost rather than efficiency optimized).

The inverter types use resonant converter technology which is the only sensible choice at that high an output voltage. I believe there are some moderately interesting patents but it's been so very long since they came out I can't remember.

--sp

There was a thread right here on SED back in August of 2000(!) at the time someone here had purchased one- I think Robert posted some links to patents for the quasi-resonant inverter technology.

On the plus side, the patents have probably run out by now. Here's one Robert referenced (warning, may contain kanamoji and/or kanji):

--sp

This would only have been of possible use to microwave oven manufacturers. The concept of going from 50Hz transformer to smpsu is an obvious one, and is normally avoided on grounds of cost. This is how it goes with most ideas , even if novel they normally have no financial value.

NT

Except when total cost of SMPS is lower than 50Hz transformer. Which it likely is, when costs are carefully calculated.

You mention $14 for the MHT1003N, 2450MHz, 250W LDMOS, but Avnet quotes $112, qty 10k.

You will not find it in a $29.95 700W microwave oven, and I'm fairly sure the costs are _very_ carefully calculated in such a product.

--sp