Radiation Tolerant LED PSU
Power supply unit for emergency lamps that may need to be used in areas with radiation. The power supply consists of a transformer, a diode bridge, capacitors and an optional voltage stabilisation device. It converts a 207V to 253V 50Hz AC to a stable DC voltage and current, as required by the LED load.
Functional specifications
Technical Requirements:
- Input Voltage: 230V AC RMS
- Voltage Tolerance: +/-10%
- Input Frequency: 50Hz
- Frequency Tolerance: +/- 0.5Hz
- Maximum power: 7W (measured at input terminals)
- Voltage Output: As LED requirements
- Current Output: As LED requirements
- Earthing Regime: IT
- Relevant standards to be observed: IEC 61000-3-2, EN 55015, EN 50082-1, EN 50082-2
Whilst the standard conditions of the electrical network dictate 230V AC with a margin of +/-10, due to cabling constraints within radiation exposed areas it would be considered advantageous should the supply continue to operate below the -10 threshold. Please note that compliance with the standards requires the power supply to be installed within a suitable enclosure, it is assumed this will be the responsibility of those manufacturing the power supply and integrating it within their existing products.
The power supply shall consist of a transformer, a diode bridge, capacitor(s) and optional voltage stabilisation device. It shall convert 50Hz AC voltages from 207V RMS to 253V RMS to a stable DC voltage, as required by the LED load. The power supply shall be designed to supply the current requirements of the connected LED load.
Block diagram
Project information
- Design files rev.1 (zip file)
- Frequently Asked Questions
- Users
Contacts
Commercial producers
Luminaires based on earlier versions of this design (using the same principles) are produced by the following companies:
Project Development
- James Devine - CERN - General question about project
- Jean Marie Foray - CERN - Engineer (2009-2014)
Project Status
Date | Event |
27-05-2011 | Initial testing of commerical prototypes for LED emergency lighting in radiation environment |
04-07-2011 | Development of technical solution following test outcomes |
05-03-2012 | Production and test of solutions based on design principles by Thorlux & Comatelec |
15-06-2013 | First test installations at CERN LHC7 and Linac 4 |
30-09-2014 | First deployment in CERN TDC2/TCC2 underground zone |
09-03-2016 | Release of updated PSU under CERN OHL |
J Devine March 2016