| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect temperatures of a plurality of semiconductor elements which perform power conversion, and to enable the detection by an inexpensive small-sized circuit. <P>SOLUTION: The power conversion device is constituted by including: a plurality of duty conversion sections 106a, 106b which are connected to voltage generation sides of a plurality of diodes 122a, 122b corresponding to a plurality of switching elements 35a, 35b respectively as temperature detection circuits 100 of the switching elements 35a, 35b and convert generated voltages to duty signals AD, BD which are different in duty by pulse width modulation; a changeover switch 104 which selects the duty signals AD, BD which are converted by the duty conversion sections 106a, 106b and are different in duty; and a control section 110 which performs control so that the duty signals different in duty are alternately selected by the changeover switch 104. <P>COPYRIGHT: (C)2011,JPO&INPIT |
