| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate a DC voltage detection value at a waveform output timing even if a carrier period of a control signal is asynchronous with a timing of sampling the DC voltage detection value. <P>SOLUTION: A power conversion device (10) having a body section (10a) for converting AC power supplied from an AC power supply (19) to feed a motor (18) includes: a control circuit (17) for outputting a switching signal to control the body section (10a) at every carrier period; a voltage detection section (36) for detecting a DC voltage of the body section (10a) at every sampling period shorter than the carrier period; and a voltage estimation circuit (40) for estimating a voltage for use in the control circuit (17) in the next carrier period according to voltage detection values detected at least three times at sampling period intervals in the voltage detection section (36) prior to the current carrier period. <P>COPYRIGHT: (C)2013,JPO&INPIT |
