Drive state detection circuit

摘要

A drive state detection circuit is disclosed that detects a drive state of plural parts driven by alternating currents. The drive state detection circuit comprises current detecting parts to detect alternating current detection signals of the respective alternating currents flowing through the driven parts, a maximum value output part to output an alternating current detection signal having a maximum value among the alternating current detection signals detected by the current detecting parts, a coefficient multiplication part to multiply the signal output from the maximum value output part by a coefficient, a comparing part to compare the multiplied signal with the alternating current detection signals so as to output state signals corresponding to the respective driven parts, a logic synthesizing part to generate an output by logically synthesizing the state signals output from the comparing part, and an output part to generate a drive state detection signal based on the output from the logic synthesizing part.