Redundant power supply switchover circuit
US5894413A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jan 28, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Jan 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is a method and apparatus for providing a power supply system having a redundant power supply switchover circuit, which maintains a remotely regulated output voltage when the power supply system switches over from the primary power supply to the secondary power supply. The power supply system comprises a secondary power supply that is connected in parallel to a primary power supply. The two power supplies are OR-connected to a load through two diodes, with the primary power supply connected to the diode via a monitor. During normal operating conditions, the primary power supply delivers most of the current because it operates in a "remote sense" configuration which provides a voltage output that is higher, by a diode voltage drop, than that of the secondary power supply, which operates in a "local sense" configuration. When a monitor detects the failure of the primary power supply, it generates a control signal to direct a relay switch to switch the secondary power supply from the "local sense" configuration to the "remote sense" configuration. As a result, the secondary power supply will deliver the full power requirements of the load. During the momentary sw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.