Combo (COMmercial Based cOnverter) family represents a family of Power Converter based on commercial units (off-the-shelves) only, integrated with other CERN elements. The main goal is to reproduce the same functionalities of a standard EPC Power Converter, recreating if required some interfaces and function.

topInvolved Peoples

Yves THUREL Yves THUREL CERN Project manager
Edwin ROHRICH Edwin ROHRICH CERN Technical manager
Nicolas KUCZEROWSKI Nicolas KUCZEROWSKI CERN Expert Designer


Range of interest is defined below, reflecting the maximum coupling decoupling devices capability (voltage & current):
Input range Output range
voltage current voltage current
[1; 3] Phases
[0; 400] VAC
< 63 A [0; 200] VDC [0; 2000] ADC

Default Range (extended range is possible on request)

topPower Converter Architecture

A COMBO Power Converter is mainly used for Experiences or Test Labs to power warm or cold Magnets (or other type of load), for DC or slow cycling machine/use. Power Converter can be divided in 3 main parts:

  • Power Part:
    • COMBO Power Rack (incl. COMBO elements like: AC & DC panels, Aux-DC power supplies box).
    • A commercial Power Source (single, series or parrallel configuration)
    • A COMBO Config Panel, interfacing CERN FGC Controller with commercial power source interface.
    • Some additional sensors (Voltage, Current) to add CERN required functionalities.

  • CERN Digital Controller (FGC3):
    • The high level control from and to the Cern Control Room (using Ethernet+ bus)
    • The high precision digital current loop (when a voltage source is controlled)
    • Collecting and reporting all status, faults, and measurements from all the different parts to the remote services, for diagnostic and operation purposes.
    • Located inside a standard COMBO Crate (up to 3x controllers in one single crate).

  • High Precision Current sensor(s) (DCCTs)
    • Measuring DC or pulse current at the required precision.
Simplified Schematic

Power Converter simplified Architecture .vsdx