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
Contacts
Commercial producers
Luminaires based on earlier versions of this design (using the same principles) are currerntly produced by the following companies:
Project Development
- James Devine - CERN - General question about project
- Jean Marie Foray - CERN - Engineer 2(009-2014)
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