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1. US20150130379 - Ground fault detecting circuit and power converting device including the same

Office
United States of America
Application Number 14390118
Application Date 09.04.2012
Publication Number 20150130379
Publication Date 14.05.2015
Grant Number
Grant Date 28.03.2017
Publication Kind B2
IPC
H02H 7/08
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
08for dynamo-electric motors
G01R 31/02
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
02Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
H02H 3/16
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
16responsive to fault current to earth, frame or mass
H02H 7/12
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
10for converters; for rectifiers
12for static converters or rectifiers
H02M 5/45
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
5Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
40with intermediate conversion into dc
42by static converters
44using discharge tubes or semiconductor devices to convert the intermediate dc into ac
443using devices of a thyratron or thyristor type requiring extinguishing means
45using semiconductor devices only
H02P 6/12
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
6Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
12Monitoring commutation; Providing indication of commutation failure
CPC
G01R 31/025
G01R 31/40
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
40Testing power supplies
G01R 31/42
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
40Testing power supplies
42AC power supplies
H02H 3/165
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection
16responsive to fault current to earth, frame or mass
162for ac systems
165for three-phase systems
H02H 7/1216
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
10for converters; for rectifiers
12for static converters or rectifiers
1216for AC-AC converters
H02M 5/45
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
5Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
40with intermediate conversion into dc
42by static converters
44using discharge tubes or semiconductor devices to convert the intermediate dc into ac
443using devices of a thyratron or thyristor type requiring extinguishing means
45using semiconductor devices only
Applicants Akinobu Ando
TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
Hiroshi Ogino
Yasuaki Matsumoto
Shigeyuki Nakabayashi
Yasuhiko Hosokawa
Inventors Akinobu Ando
Hiroshi Ogino
Yasuaki Matsumoto
Shigeyuki Nakabayashi
Yasuhiko Hosokawa
Agents Oblon, McClelland, Maier & Neustadt, L.L.P.
Title
(EN) Ground fault detecting circuit and power converting device including the same
Abstract
(EN)

In the ground fault detecting circuit, one terminals of first to third resistance elements are connected to first to third AC lines, respectively, the other terminals of the first to third resistance elements are commonly connected to one terminal of a fourth resistance element, and the other terminal of the fourth resistance element is connected to a line of a ground voltage. On the basis of a voltage across the terminals of the fourth resistance element, the ground fault detecting circuit detects whether a ground fault has occurred or not. Since a current does not flow through the fourth resistance element in the normal state and flows through the fourth resistance element after the occurrence of a ground fault, it is possible to detect the occurrence of the ground fault at a high accuracy.