| 摘要 |
A wave form corresponding to at least one power ratio among a plurality of power ratios set according to a temperature of a fixing part include a first group wherein a negative half-wave to at least partially turn on a half-wave and a positive-half-wave to at least partially turn on a half-wave continue in order after a half-wave to entirely turn off an one half-wave, and a second group wherein a positive-half-wave to at least partially turn on a half-wave continues just after a -half-wave to entirely turn off an one half-wave, thereby an accuracy of current detection can be improved.
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