| 摘要 |
PURPOSE: A compensating method of an input voltage for an electric rice pot is provided to perform differential control of a duty ratio to output regular voltage in emergency or keeping-warm mode regardless of changes in the input voltage. CONSTITUTION: An input voltage level is detected through a voltage level sensor. Rice boiling or keeping-warm is decided depending on the detected input voltage level. If keeping-warm is decided, a duty ratio is controlled depending on whether the input voltage is higher or lower than rated voltage. If rice boiling is decided, an electric rice pot is heated and input voltage is compared with the set rated voltage. The rice pot is controlled to a reference duty ration if the input voltage is the same as the set rated voltage. Otherwise, the input voltage level is compared with 95% of rated voltage level. The duty ratio is increased one step higher than the reference duty ratio if the input voltage level is the same as 95% of the rated voltage level. Then, the input voltage level is increased two steps lower than the reference duty ratio if the input voltage level is the same as 90% of the rated voltage level. The duty ratio is controlled depending on whether the input voltage is higher than the rated voltage. Therefore, the flavor of rice is kept regular.
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