Patent ID: 7274172
Filing Date: 2007-09-25
Classification: H02H

Abstract:
1. A drive state detection circuit to detect a drive state of a plurality of parts driven by alternating currents, comprising: current detecting part 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.