RaToPUS, radiation tolerant AC-DC power supply
Project description
RaToPUS is a 100W AC/DC power supply compatible with the CompactPCI-Serial standard (CPCI-S.0). It is designed in the frame of the Distributed I/O Tier project to be used in radiation-exposed installations of the HL-LHC at CERN.
Disclaimer:
Manufacturing the power supply according to the design published in this project does not ensure it will be resistant to radiation. Only using the components from a lot qualified in irradiation campaign guarantees that this power supply will withstand the radiation levels mentioned in the specification.
Specifications
Parameter | Value |
---|---|
Input | Nominal: 230Vac, 0.55A Range: 90-265 Vac, 50-60 Hz |
Outputs | 12V, 8.33A, 100W – Payload channel (can be turned OFF) 5V, 2A, 10W – Standby channel (always ON) |
Output voltage ripple + noise (pk-pk value) |
100mVpp for 12V 20mVpp for 5V |
Regulation: Line Regulation: Load |
±2% ±2% |
Efficiency | ≥80% at 230 Vac |
Power factor | ≥0.90 (ENERGY STAR) using PFC Buck AC/DC |
Switching frequency | 100kHz (AC/DC), 200 kHz (DC/DC) |
Transient response | 10% maximum deviation; Returns to nominal Vo in 1 ms maximum. |
Total Ionizing Dose (TID) | 500 Gy |
PCB dimensions | 100 mm x 160 mm x 37 mm |
PSU dimensions (including packaging) | 3U x 170mm x 8HP (133mm x 170mm x 40mm) |
External monitoring | PMBus: Conveys output voltages, output currents, temperature (via MoniMod) |
External control | PS_ON pin for remote switching ON/OFF of payload channel |
EMI specifications | EN55022 Class B |
Thermal environment: - Ambient temperature range - Active cooling |
0 to +65ºC No |
Redundancy/load sharing | 2 instances of RaToPUS sharing full load: +12V, 100W with ±10% tolerance (40%/60% or better) |
Architecture
RaToPUS is designed in two stages:
- Non-isolated AC/DC stage: 230Vac to 48Vdc implemented using Power Factor Correction (PFC) Buck Topology
- Isolated DC/DC stage:
- 48Vdc to 12Vdc (100W) implemented using an Active-Clamp Forward (ACF) Converter
- 48Vdc to 5Vdc (10W) implemented using a Flyback Converter
Design files
- Altium schematics and layout for latest version of DC/DC 12V
- Altium schematics and layout for latest version of AC/DC
Radiation test reports (requires CERN account)
Related links and documents
- DI/OT System Specification
- RaToPUS: Radiation-Tolerant Switched-Mode AC/DC Power Supply, presentation at R2E Annual Meeting, 2021
- CompactPCI-Serial standard
- FEAST2.1 datasheet
Contacts
- Greg Daniluk - CERN
- Paul Peronnard - CERN
- Lalit Patnaik - ex CERN
Status
Date | Event |
---|---|
Sep-2018 | Start working on project. Collecting main specifications |
Jan-2019 | First prototype of non-isolated 10W DC-DC stage |
May-2019 | Prototype v0.3 - 60W isolated 48VDC to 12VDC |
Jun-2019 | The idea of using FEAST as PWM controller for DC-DC stage is dropped - control loop stability problems for higher (60W) power DC-DC |
2020-2021 | Evaluation of Active Clamp Forward architecture for DC-DC stage using COTS PWM controller |
21-02-2022 | Change of responsible from Lalit to Paul. Redesign being done: AC/DC simple transformer with diode bridge, DC/DC should also dissipate less |