| 摘要 |
A power failure section can be accurately detected without depending on a loaded state and application of voltage to the overhead power line can be stopped in a short time when a power failure is detected. An electric car controller includes an overhead power line voltage detector ( 11 ), a band-pass filter for detecting a ripple component included in the detected overhead power line voltage, a comparator- 1 for comparing the level of the detected ripple component with a predetermined reference value Vref 1 , a rheotome control circuit ( 16 ) and a rheotome ( 3 ) which judge that a power failure has occurred if the ripple component is judged to be smaller than the reference value Vref 1 based on a comparison result obtained by the comparator- 1 and disconnect the overhead power line ( 1 ) from a VVVF inverter ( 6 ), a second comparator- 2 for comparing the level of the ripple component with a reference value Vref 2 larger than the reference value Vref 1 , and a brake chopper ( 8 ) and a brake chopper control circuit ( 17 ) which operate if the ripple component is judged to be smaller than the reference value Vref 2 based on the comparison result obtained by the comparator- 2 to suppress the increase of the overhead power line voltage.
|
