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Abstract

A current detector for detecting a main circuit current of an inductor connected to a switching element whose operation generates that current. The inductor includes main and auxiliary windings equal in numbers of turns and connected to the detector so as to cancel out electromotive forces generated by the operation in the windings. The detector includes a voltage detection unit having two input terminals. One end of each winding is connected to a different one of these terminals. The voltage detection unit detects a voltage difference between the connected ends. The detector also includes a temperature detection unit detecting a temperature of the main winding, and a current calculation unit correcting a main winding resistance using the detected temperature and calculating a current as the main circuit current, using the corrected resistance and an average detected voltage calculated from sampled values of the detected voltage using a sampling frequency.

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