wrote in
:

Yeah, I was planning on using pretty much the whole input section to
the PC power supply. The one I am looking at I think I can cut out the
whole circuit with a coping saw and mount it on some standoffs. This
would put the rectifiers and caps on a seperate little chassis and I
wont have to shoehorn in the 'lytics on to the inverter board.

I was noticing that the schematic for the 120VAC uwave inverters is
pretty much the same as the 240VAC inverter. I was expecting mains
input to be different. What I was expecting was a voltage doubler on
the 120VAC board since the 240VAC board used a bridge. This would mean
that the inverter section is designed to run off of anything from
150VDC to 300VDC . I need to take a closer look at just what are the
differences in the 120 and 240 inverters.

Jimmie


Jimmie



Frankenstein style construction. Hopefully you'll be tempted to
shout "IT'S ALIVE!" but without the arcs and sparks.

A 2:1 input range is a piece of cake for a flyback. An 8:1
range isn't unheard of in commodity products. Not being
strictly bounded by the transformer (coupled inductor) turns
ratio can be handy!

There need not be any differences in the power components.
The control parameters important to operation of the oven
might need adjustment though.

That said, optimization for each range could save a few coins.
Make a million ovens or two and it adds up.

On Sep 12, 9:49*pm, Grumpy The Mule wrote:
wrote :





Yeah, I was planning on using pretty much the whole input section to
the PC power supply. The one I am looking at I think I can cut out the
whole circuit with a coping saw and mount it on some standoffs. This
would put the rectifiers and caps on a seperate little chassis and I
wont have to shoehorn in the 'lytics on to the inverter board.

I was noticing that the schematic for the 120VAC uwave inverters is
pretty much the same as the 240VAC inverter. I was expecting mains
input to be different. What I was expecting was a voltage doubler on
the 120VAC board since the 240VAC board used a bridge. This would mean
that the inverter section is designed to run off of anything from
150VDC to 300VDC . I need to take a closer look at just what are the
differences in the 120 and 240 inverters.

Jimmie

Jimmie

Frankenstein style construction. *Hopefully you'll be tempted to
shout "IT'S ALIVE!" but without the arcs and sparks.

A 2:1 input range is a piece of cake for a flyback. *An 8:1
range isn't unheard of in commodity products. *Not being
strictly bounded by the transformer (coupled inductor) turns
ratio can be handy!

There need not be any differences in the power components.
The control parameters important to operation of the oven
might need adjustment though.

That said, optimization for each range could save a few coins.
Make a million ovens or two and it adds up.- Hide quoted text -

- Show quoted text -

I went through the parts list for each power supply and their are some
different part #s for the 120vac
compared to the 240vac unit and the wiring is a little different.

Grumpy, did you want a detailed schematic or did I already give you
one?
Send me an email and I will get one to you.

There are part#s for everything. Maybe you could order just the
transformer if you wanted.

Jimmie

Thanks for the schematic Jimmie.

The description of the inverter circuit translated by google
says it's both variable frequency pulse and width modulated
er... I think. This Could be critical conduction control.

I couldn't find any mention of the flyback topology but my
Portuguese consists of only a dozen or so words that I learned
while living on the east coast and five of those are unseemly.
-------------------------------------------------------------

This Power Supply Reversing receives the 120v or
220v 60Hz AC and provides the entry for the 4000 Vdc
the magnetron tube, before performing the same function
made by the processor and high-capacitor and diode,
high.

.. The entry of tension AC120V or 220V 60Hz is retificada
immediately to a voltage DC.

.. Voltage DC This will feed a device
IGBT switching required. This device will
chavear On and off for 20 to 40 kHz PWM (Pulse Wide
Modulation) the sign of the microprocessor in the DPC.

.. This microprocessor commands the processor high
voltage to amplify and until 2000Vac
3Vac about by the processor.

.. Then a circuit of half wave rectifier folder, which
consists of a diode and high voltage capacitors, generate
4000V required for the magnetron.

.. The output of the magnetron is always monitored
by the current output of the processor internally
reverse the circuit.

On Sep 14, 5:56*pm, Grumpy The Mule wrote:
Thanks for the schematic Jimmie.

The description of the inverter circuit translated by google
says it's both variable frequency pulse and width modulated
er... I think. *This Could be critical conduction control.

I couldn't find any mention of the flyback topology but my
Portuguese consists of only a dozen or so words that I learned
while living on the east coast and five of those are unseemly.
-------------------------------------------------------------

This Power Supply Reversing receives the 120v or
220v 60Hz AC and provides the entry for the 4000 Vdc
the magnetron tube, before performing the same function
made by the processor and high-capacitor and diode,
high.

. The entry of tension AC120V or 220V 60Hz is retificada
immediately to a voltage DC.

. Voltage DC This will feed a device
IGBT switching required. This device will
chavear On and off for 20 to 40 kHz PWM (Pulse Wide
Modulation) the sign of the microprocessor in the DPC.

. This microprocessor commands the processor high
voltage to amplify and until 2000Vac
3Vac about by the processor.

. Then a circuit of half wave rectifier folder, which
consists of a diode and high voltage capacitors, generate
4000V required for the magnetron.

. The output of the magnetron is always monitored
by the current output of the processor internally
reverse the circuit.

This thing seems to be regulated primarily by the input CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.

I cant remember now where I saw it refered to as a.flyback circuit but
it said "FLYBACK" no trouble with translation.

I will look for it tonight.


Jimmie

On Sep 15, 12:57*am, wrote:
On Sep 14, 5:56*pm, Grumpy The Mule wrote:





Thanks for the schematic Jimmie.

The description of the inverter circuit translated by google
says it's both variable frequency pulse and width modulated
er... I think. *This Could be critical conduction control.

I couldn't find any mention of the flyback topology but my
Portuguese consists of only a dozen or so words that I learned
while living on the east coast and five of those are unseemly.
-------------------------------------------------------------

This Power Supply Reversing receives the 120v or
220v 60Hz AC and provides the entry for the 4000 Vdc
the magnetron tube, before performing the same function
made by the processor and high-capacitor and diode,
high.

. The entry of tension AC120V or 220V 60Hz is retificada
immediately to a voltage DC.

. Voltage DC This will feed a device
IGBT switching required. This device will
chavear On and off for 20 to 40 kHz PWM (Pulse Wide
Modulation) the sign of the microprocessor in the DPC.

. This microprocessor commands the processor high
voltage to amplify and until 2000Vac
3Vac about by the processor.

. Then a circuit of half wave rectifier folder, which
consists of a diode and high voltage capacitors, generate
4000V required for the magnetron.

. The output of the magnetron is always monitored
by the current output of the processor internally
reverse the circuit.

This thing seems to be regulated primarily by the input CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.

I cant remember now where I saw it refered to as a.flyback circuit but
it said "FLYBACK" no trouble with translation.

I will look for it tonight.

Jimmie- Hide quoted text -

- Show quoted text -

While brows varios inverter circuits I began to wonder how difficult
would it be to convert a pulse width modulated power supply into a
power supply /AM modulator. Could this be as simple as appling audio
on the feedback path between the output and the PWM circuit. Just an
idle thought.


Jimmie

wrote:
snip
This thing seems to be regulated primarily by the input CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.
==========================================
You might consider taking a voltage sample by 'tapping' a low DC voltage
fraction from the HV output ,putting that into an opamp with adjustable
output.

You can see how this is done in an article in QEX-July.August 1999
,pages 50-55. 'A regulated 2400 V power supply ' by VE6AXW

Frank GM0CSZ / KN6WH

On Sep 15, 12:57*pm, Highland Ham wrote:
wrote:

snip This thing seems to be regulated primarily by the input CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.

==========================================
You might consider taking a voltage sample by 'tapping' a low DC voltage
fraction from the HV output ,putting that into an opamp with adjustable
output.

You can see how this is done in an article *in QEX-July.August 1999
,pages 50-55. 'A regulated 2400 V power supply ' by VE6AXW

Frank *GM0CSZ / KN6WH

Thanks Frank, but I dont have QEX or access

Jimmie

wrote:
On Sep 15, 12:57 pm, Highland Ham wrote:
wrote:

snip This thing seems to be regulated primarily by the input CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.
==========================================
You might consider taking a voltage sample by 'tapping' a low DC voltage
fraction from the HV output ,putting that into an opamp with adjustable
output.

You can see how this is done in an article in QEX-July.August 1999
,pages 50-55. 'A regulated 2400 V power supply ' by VE6AXW

Frank GM0CSZ / KN6WH

Thanks Frank, but I dont have QEX or access

Jimmie
http://www.realhamradio.com/hvreg.pdf

for a schematic.

hth

Steve H

steve H wrote:
wrote:
On Sep 15, 12:57 pm, Highland Ham wrote:
wrote:

snip This thing seems to be regulated primarily by the input
CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.
==========================================
You might consider taking a voltage sample by 'tapping' a low DC voltage
fraction from the HV output ,putting that into an opamp with adjustable
output.

You can see how this is done in an article in QEX-July.August 1999
,pages 50-55. 'A regulated 2400 V power supply ' by VE6AXW

Frank GM0CSZ / KN6WH
==============================================
Thanks Frank, but I dont have QEX or access

Jimmie
======================================
http://www.realhamradio.com/hvreg.pdf

for a schematic.

hth

Steve H
=================================
Indeed ,that's the one. Tnx Steve for the interesting URL

Frank GM0CSZ / KN6WH

On Sep 15, 3:03*pm, Highland Ham wrote:
steve H wrote:
wrote:
On Sep 15, 12:57 pm, Highland Ham wrote:
wrote:

snip This thing seems to be regulated primarily by the input
CURRENT which
would be the same as power and David Smith said in his discription. I
think the answer to using it as a power supply is to turn it into a
VOLTAGE regulated power supply by taking a voltage sample off of the
HV transformer, possible by adding a couple of turns coil to the
transformer, and replacing the input from the current transformer with
this one. Naturally the inpit to IINDO may have to be suitably
modified also.
==========================================
You might consider taking a voltage sample by 'tapping' a low DC voltage
fraction from the HV output ,putting that into an opamp with adjustable
output.

You can see how this is done in an article *in QEX-July.August 1999
,pages 50-55. 'A regulated 2400 V power supply ' by VE6AXW

Frank *GM0CSZ / KN6WH

============================================== Thanks Frank, but I dont have QEX or access

Jimmie

======================================http://www.realhamradio.com/hvreg.pdf

for a schematic.

hth

Steve H

=================================
Indeed ,that's the one. *Tnx Steve for the interesting URL

Frank * GM0CSZ / KN6WH- Hide quoted text -

- Show quoted text -


Is there any more info on the circuit besides the schematic?

This looks like something I could build and I probably already have
most of the parts.


I see it uses SCRs for switching. I guess there is no problem with
latchup. I built a 400Hz inverter one time and it seemed to work for a
while until one day it latched up on me and smoked. I had been using
it to power some selsyn motors. Someone plugged a soldering iron into
the inverter and I think it was a little too much load. I guess that
is what I get for not labeling my outlets.

Jimmie