Temperature compensated, regulated power supply and battery charger for railroad signal use
US5451857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1992 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Sep 15, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates utilizes a ferroresonant transformer having a primary winding, a secondary winding, and a resonant circuit in magnetic circuit therewith. Voltage regulation is accomplished at essentially no load conditions by the use of a temperature sensing element and a shunt regulator connected in circuit with the output terminals of the secondary winding. The shunt regulator varies the output voltage at the output terminals in response to temperature sensed by the temperature sensing element during essentially no load conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.