Title:
CURRENT DETECTOR
Document Type and Number:
Japanese Patent JP2993537
Kind Code:
B2
Abstract:
PURPOSE: To provide a current detector which can remove spikelike noise generated at an output of an insulating amplifier at a moment that a phase voltage is abruptly varied while a current detecting delay is limited to a minimum limit in a controller using an inverter.
CONSTITUTION: A pulse synchronized with a variation in a phase voltage is generated from a holding signal generator 20 based on an ON/OFF signal to a power element (e.g. power elements Tr1, Tr2 of an inverter of a phase to be measured and polarity of a phase current. And, noise is removed by stopping a sampling operation of a secondary side of an insulating amplifier 10 by using a gate circuit 13 during a period of ON of a pulse signal sent from the generator 20.
Inventors:
EBA KOJI
Application Number:
JP29067191A
Publication Date:
December 20, 1999
Filing Date:
October 09, 1991
Export Citation:
Assignee:
OOKUMA KK
International Classes:
H02M7/48; H02P21/05; H02P21/14; H02P21/22; H02P23/04; H02P23/14; H02P25/098; H02P27/06; H02P27/08; H02P29/00; H02P29/40; (IPC1-7): H02M7/48; H02P5/00; H02P7/63
Domestic Patent References:
| JP6361962A | ||||
| JP547528A |
Attorney, Agent or Firm:
Azusa Yuzo