Power Supply Upgrade for ATLAS Liquid Argon Front End Crate. Motivation for Upgrade Potential Companies Work to date and future work. Motivation for Upgrade. Reliability – Power supply made by Modular Devices Inc has been made more reliable but is still not at a comfortable point yet.
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Anticipated Radiation Environment for Upgrade (including safety factors)
Magnetic Field Environment
Whatever power supply approach is selected the # 1 priority must be reliability.
1) Centralized or Distributed (i.e. board level) system or perhaps a combination.
2) AC or DC input. If DC what is the lowest voltage we can supply from outside?
Constraints. There are some things which can not easily be changed from the present configuration and need to be incorporated in any upgrade.
100% effective duty cycle at any Vout
Isolation & Transformation
Wide range DC bus
e.g. 36–75 Vdc
K = NS / NP
PRM (Pre Regulator Module) + VTM (Voltage Transformation Module) Combination Provides Regulation and Isolation/Transformation(slide courtesy of Vicor)
Regulated load voltage