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8kV MW oven supply measured
----------
From: Marco Denicolai [SMTP:marco-at-vistacom.fi]
Sent: Wednesday, May 27, 1998 12:47 AM
To: tesla-at-pupman-dot-com
Subject: 8kV MW oven supply measured
I had eventually a chance of performing a real measurement on the circuit
below. I used a digital scope and applied to the mains 3.5 VAC instead
of 220 VAC. After the measurements, I scaled up the results and these
I am reporting in the following.
| |
--------|| ||-----| |----*---------- V-
* || || * | | |
|| || -----
220V || || \ /
|| || \ /
|| || -----
|| || |
--------|| ||------------*--- GND
|
|
--------|| ||------------*
* || || * |
|| || -----
|| || \ /
220V || || \ /
|| || -----
|| || | | |
--------|| ||-----| |----*----------- V+
| |
Voltage V+ to GND oscillates between 6270 V and 0 (2200 VAC * 2 * sqrt(2) =
6270 Vpp).
Voltage between V- and GND oscillates between -6270 V and 0.
If the transformers are in phase, voltage between V+ and V- is almost DC at
6270 VDC.
V+ |----| |----| |----|
| |----| |----| |
GND ------------------------------ V+ - V- = 6.3kV DC
|----| |----| |----|
V- | |----| |----| |----
If the transformers are NOT in phase, the output is a sinusoid at 50 Hz
going from 0
to 6270 Vpp * 2 = 12540 Vpp.
V+ |----| |----| |----|
| |----| |----| |----
GND ------------------------------ V+ - V- = 0 to 12.5kV DC pulsed
| |----| |----| |----
V- |----| |----| |----|
I intend to use the last configuration (transformers NOT in phase, 12.5kV
pulsed output).
I think static spark gaps won't easily quench, for the microwave oven
transformers are
capable to pump even 500 mA. Instead, a rotating spark gap would be forced
to quench at
my rotating rate.
Any suggestion about the spark gap choice?
________________________________________________________________________
Marco Denicolai Vista Communication Instruments, Inc.
Hardware Development Manager www.vistacom.fi
marco-at-vistacom.fi Kaisaniemenkatu 13 A
fax: +358-9-622-5610 SF-00100 HELSINKI
phone: +358-9-622-623-15 Finland
Remember, Murphy was an optimist! I am not...
________________________________________________________________________