Technical Manual

12
MAGNETRON HEATER POWER SUPPLY
Technical Discussion
The magnetron heater power supply consists off three parts:
A. Heater meter control card
B. High voltage inverter transformer
C. Filter section
The control card for the heater power supply is shown in figure 8.0.
The control circuit generates a PWM signal to drive a discontinuous mode power
supply. The high voltage section of the power supply is inside the modulator
including the filter section and feedback.
The feedback signal returns to the control circuit and regulates the heater voltage for
both stand by and full duty cycle conditions.
The feedback signal is fed back through the bifilar winding of the pulse transformer.
The control card provides the metering circuit for the filament voltage.