[Amps] Panasonic "inverter" Switching HV power supply

[TexasRF at aol.com]

In a message dated 3/9/2006 9:43:18 A.M. Central Standard Time,  
wlfuqu00 at uky.edu writes:

I have not had the time to get back to experimenting with the  
Panasonic Inverter Microwave oven HV supply. Have any of you had a chance  
to actually use one? I did some experiments and was able to control the  
under load output voltage  from about 500 volts to 3kV.    The ovens were 
about $75 at WalMart  a year ago or  so.

73
Bill wa4lav



_______________________________________________
Amps mailing  list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps



Hi Bill I have not used one of those inverter style power supplies yet but  
they do sound interesting.
 
I have recently been experimenting with a transformer style microwave oven  
power supply for possible use as a helix voltage power supply for a traveling  
wave tube project. These supplies have a 2100vac transformer used with a half  
wave voltage doubler to reach an output voltage of about 6kv no load.  
Interestingly, the output diode is the magnetron and there is no filter C at  that 
point. I guess clean dc is not a requirement for cooking food.
 
Is the inverter unit intended to also work with a doubler for similar  
voltages? Have you looked at ripple voltages under load and if so how was that?  The 
transformer type power supply, having a 60Hz waveform has a few hundred  
volts ripple under load. If the inverter unit is running at a high switching  
frequency then perhaps the ripple voltage is much improved.
 
I am curious if the inverter output is d.c. or a.c. and if it uses the  
magnetron as part of the rectifier circuit. If it does use the magnetron in this  
manner then there is a good chance an additional pair of capacitors and diodes  
can be added to make up a times four multiplier to reach 10 to 12 kV. Some of 
 the higher power TWTs need 9 to 10kV for the helix and this would be a great 
way  to generate the voltage at 5 mA or so.
 
Thanks for mentioning your experiments there as I appreciate being made  
aware of the high voltage inverter.
 
73,
Gerald K5GW