Re: [Amps] High Voltage inverter?

[Bill Fuqua <wlfuqu00@uky.edu>]

It appears that the primary is resonant with a capacitor across it. It must 
be a sine or ringing inverter which would explain why they
only use one really big transistor (IGBT has G, E, C connections) rather 
than a pair of power transistors.
Noise should be a matter of shielding if building an HV power supply and 
you could turn it off when receiving.

73
Bill wa4lav


At 10:41 PM 7/7/2004 -0700, gdaught6@stanford.edu wrote:
> On 7 Jul 2004 at 11:53, Bill Fuqua wrote:
>
> >     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.
>
> We bought one.  The "inverter" part of it is apparently a switching
> HV supply.  It produces ghastly RFI!  Our house rule is "Don't use it
> when Grumps is on the radio!"
>
> If someone in the neighborhood gets one and decides to cook a turkey,
> then my HF efforts are doomed until the bird is done!
>
> 73,
>
> Grumps, aka
>
> George T. Daughters, K6GT
>
>
>
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