| 摘要 |
<P>PROBLEM TO BE SOLVED: To reliably stop discharge when a fault occurs. <P>SOLUTION: A discharge circuit for a DC power supply smoothing capacitor 326 that is used in a power conversion device 200 that supplies DC power via a switch 304 to the DC power supply smoothing capacitor 326 and an inverter 144, includes; a resistor 324 that discharges charge in the capacitor 326; a switch 325 connected in series with the resistor 324, that either passes or intercepts discharge current flowing from the capacitor 326 to the resistor 324; measurement circuits 317, 319 that measure a terminal voltage of the capacitor 326; and a control circuit 319 that controls continuity and discontinuity of the switch 325; wherein the control circuit 319, after having made the switch 325 continuous and starting discharge of the capacitor 326 by the resistor 324, if a terminal voltage of the capacitor 326 as measured by the measurement circuits 317, 319 exceeds voltage drop characteristics set in advance, makes the switch 325 discontinuous and stops discharge by the resistor 326. <P>COPYRIGHT: (C)2011,JPO&INPIT |
