| 摘要 |
a heating room for putting a food to be defrost; a defrost state sensor(11) for sensing changes depending on a defrost state; amplifiers(1,12) for amplifying a sensing signal; a zero point adjuster(15) for initializing an output signal of an amplifier for an initial defrost action; and a micro computer(16) for controlling a zero point adjuster to initialize the output of the amplifier with a predetermined value and generating a control signal after detecting the defrost state of the food from the amplifier output signal.
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