Re: [Amps] Fwd: High Voltage inverter?

[Bill Fuqua <wlfuqu00@uky.edu>]

Since I had no replies I just picked one up from WalMart.
It has an interesting HV power supply. In fact I could not tell which was 
heavier, the packaging or the microwave oven after unpacking it and 
removing the glass platter. It is very complex in design. Lots of parts and 
a chip with many pins but the interesting thing is that the inverter only 
has ONE very large MOSFET.

Some things occurred to me.

1. The microwave ovens still have to turn on and off at a 60 Hz rate here 
in the US. The reason being is so that 2.4 Ghz Wireless Digital devices can 
still function while a nearby microwave oven is running. This is achieved 
by having data packets shorter than 1/120 of a second. If it were on 
continuously it would interrupt data from 2.4 GHz devices.
2. It seems that this one has a 3 wire communication connection to the 
front panel controller.

I will probably remove most of the power supply and build my own driver but 
take advantage of the HV components and big full wave rectifier ( but had 
filter capacitors).

Since the oven is supposed to have 1.3KW output I suspect the power supply 
is capable of about 2KW.

Please email me if you want to see pictures of the "inverter power supply".

73
Bill wa4lav


At 12:11 PM 7/7/2004 -0400, Bill Fuqua wrote:
> I may have answered my own question. This is in a letter from Panasonic.
>
> Moreover, because the bulky transformer is replaced by the compact 
> Inverter circuit,
> it's possible to have a spacious oven interior while maintaining a compact 
> exterior.
>
> The entire letter is posted 
> at:http://www.panasonic.com.au/pdf_media/00006e.pdf
> I may get one anyway to just take apart.
> 73
> Bill wa4lav
>
>
> > Date: Wed, 07 Jul 2004 11:53:18 -0400
> > To: AMPS <amps@contesting.com>
> > From: Bill Fuqua <wlfuqu00@uky.edu>
> > Subject: High Voltage inverter?
> >
> >    Does anyone know anything about the  Panasonic  Inverter Microwave Ovens.
> > Could it be that they are using a high voltage inverter or just control 
> > filament to limit
> > power output?
> >
> > The advantage of these is that they don't switch on and off like the 
> > ordinary ones
> > do while defrosting or when set for less than full power.
> >
> > If it is the HV that they are producing via inverter then perhaps they 
> > are good
> > candidates for switching HV power supplies.
> >
> > For only about $75 spent at WalMart maybe someone can check it out.
> > I just bought a microwave oven and have too many just now.
> >
> > 73
> > Bill wa4lav
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