| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power converter capable of preventing a switching element etc. from being damaged when discharging a smoothness capacitor. <P>SOLUTION: A power converter comprises: a backup power supply Eb independent of a power supply Es supplying power during discharge; and a discharge-time driving circuit Mb on/off-driving an upper arm switching element Qu which is one of switching elements Qu and Qd that are serially connected vertically with a lower prescribed range of voltage and frequency than that of a driving signal outputted by a normal-time driving circuits Mu and Md, and always on-driving a lower arm switching element Qd. This enables to prevent the switching elements Qu and Qd etc. from being damaged when discharging a smoothness capacitor Cav so as to improve a fail-safe functionality. Restricting a switching element that causes excess current and overheat surely prevents the excess current and the overheat. <P>COPYRIGHT: (C)2012,JPO&INPIT |
