Figure 3-4. Magnetron
Power Transformer
The power transformer converts 115 volts AC to approx-
imately 3.3 volts AC on the filament winding which
heats the magnetron filament. The transformer also
converts the 115 volts AC input to approximately 2300
volts AC on the high voltage winding, which is sent to
the voltage doubler circuit. (See Figure 3-2)
Voltage Doubler Circuit (Capacitor and Rectifier)
Capacitor - The capacitor receives approximately
2300 volts AC from the transformer, accumulates the
voltage and stores it until approximately 4600 volts (two
2300 volt sine waves) are stored. The capacitor then
discharges the 4600 volts in bursts to the magnetron.
(See Figure 3-3)
Rectifier - Before the capacitor receives the 4600
volts AC, the rectifier shunts the negative side of the
two 2300 volt AC sine waves to ground, so the capaci-
tor only receives the positive side of the sine waves.
(See Figure 3-3)
Magnetron
The magnetron converts the high voltage from the volt-
age doubler circuit to microwave energy, then feeds the
microwave energy through the waveguide, into the cavi-
ty feedbox and into the oven cavity where the food is
cooked. (See Figure 3-4)
Turntable Motor
The turntable motor, located on the bottom of the oven
cavity, rotates the turntable support and tray so that
food on the tray cooks evenly. The turntable motor will
turn in either direction.
AH (Absolute Humidity) Sensor
The AH sensor "senses" the vapor from foods cooking
in the cavity. When enough steam from the food is
sensed, the sensor relays the information to the micro-
processor which then calculates the remaining cooking
time and power level needed for best results. In this
mode, food is cooked without figuring time, power level
or quantity.
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