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1. WO1995034824 - FAULT DETECTION CIRCUIT FOR SENSING LEAKAGE CURRENTS BETWEEN POWER SOURCE AND CHASSIS

Publication Number WO/1995/034824
Publication Date 21.12.1995
International Application No. PCT/US1995/006973
International Filing Date 01.06.1995
Chapter 2 Demand Filed 02.01.1996
IPC
G01R 31/00 2006.01
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
G01R 31/02 2006.01
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
CPC
B60L 1/003
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
1Supplying electric power to auxiliary equipment of vehicles
003to auxiliary motors, e.g. for pumps, compressors
B60L 1/02
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
1Supplying electric power to auxiliary equipment of vehicles
02to electric heating circuits
B60L 2250/10
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
2250Driver interactions
10by alarm
B60L 3/0046
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
3Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
0046relating to electric energy storage systems, e.g. batteries or capacitors
B60L 3/0069
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
3Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
0069relating to the isolation, e.g. ground fault or leak current
B60L 3/04
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
3Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
04Cutting off the power supply under fault conditions
Applicants
  • NORTHROP GRUMMAN CORPORATION [US]/[US]
Inventors
  • SCHANTZ, David, Lloyd, Jr.
  • MUNRO, James, Louis
Agents
  • SUTCLIFF, Walter, G.
Priority Data
08/258,17910.06.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FAULT DETECTION CIRCUIT FOR SENSING LEAKAGE CURRENTS BETWEEN POWER SOURCE AND CHASSIS
(FR) CIRCUIT DE DETECTION DE DEFAUT SERVANT A DETECTER UN COURANT DE FUITE ENTRE UNE SOURCE DE PUISSANCE ET UN CHASSIS
Abstract
(EN)
A fault detection circuit for detecting leakage currents between a DC power source and chassis of an automobile, includes a voltage sensor coupled to the DC power source, the voltage sensor including an analog reference and a chassis ground. A differential amplifier is coupled to the voltage sensor and detects variations in the analog reference and the chassis ground. A voltage comparator unit determines whether the variations detected in the differential amplifier is above a predetermined threshold value. A built-in test circuit tests whether the fault detection circuit is operating correctly.
(FR)
Circuit de détection de défaut servant à détecter des courants de fuite entre une source de courant continu et le châssis d'une automobile et comprenant un capteur de tension couplé à la source de courant continu et comportant une référence analogique et une prise de terre du châssis. Un amplificateur différentiel est couplé au capteur de tension et détecte des variations de la référence analogique et de la masse. Un comparateur de tension détermine si les variations détectées dans l'amplificateur différentiel dépassent une valeur seuil prédéterminée. Un circuit de contrôle intégré contrôle le fonctionnement correct du circuit de détection de défaut.
Also published as
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