Non-isolated power supply output chassis ground fault detection and protection system
US9705306B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2014 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Sep 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A non-isolated power supply is configured to receive an input voltage and supply an output voltage, and includes a supply line, a return line, a first semiconductor switch coupled in series in the supply line, and a second semiconductor switch coupled in series in the return line. The first and second semiconductor switches are each configured to operate in an ON state and an OFF state. The differential current sensor is configured to sense differential current between the supply line and the return line. The fault detection logic is coupled to the differential current sensor, the first semiconductor switch, and the second semiconductor switch, and is configured to detect when the differential current exceeds a predetermined current magnitude, and command the first and second semiconductor switches to operate in the OFF state upon detecting that the differential current exceeds the predetermined current magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.