1-4H54
WEIGHT SENSOR CIRCUIT
Turntable
Suppbrt Roller
Arm
Base plate Weight Sensor
of Oven
/
Turntable Motor
Sectional View of Turntable
Weight
Screw Piezo-
Output Weight Casing
electric wire Sensor
Device support
Construction of Weight Sensor
Weight
sensor
%
_ 9
R79 ’
’ A5
1
c71
! 1 VR.-18V
I
Weight sensor circuit
This circuit works to weight the food by weight sensor during SENSOR DEFROST modes to set heating time.
Piezo-electric device is used in the weight detector section.
When the roller below the turntable presses the
knob, through oven seal. the piezo-electric device generates the voltage according the load applied on the roller.
Weight sensor and then sent to A/D conversion input pin A5 inside of LSI. The LSI converts the value into
weight and calculates the heating time.
Weight measurement is made by the three rollers passing on the knob,
taking the average value of the voltage then produced. This initial balancing is set up about 50 seconds after
unit is put in the Weight sensor cooking mode.
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