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.
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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.