Fault detection circuit for sensing leakage currents between power source and chassis
US5481194A · kind A · utility
81Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.