Rullion are looking to recruit for the following role:
Electronics Engineer
Start : 1st May 2026
12 month contract
Location : Oxford
Inside IR35
PAYE £46 Per hour /£59 Per hour Umbrella.
7.5 hours per day 37.5 hours per week
Power Supply & Power Electronics Design
* Design and develop high-current, high-stability power supplies for superconducting magnets and related systems
* Design linear and switch-mode power converters (DC/DC, AC/DC, current-regulated supplies)
* Develop precision current regulation and control loops with excellent stability and low ripple
* Perform detailed control-loop analysis (Bode plots, phase margin, transient response)
* Design protection circuits (over-current, over-voltage, ground fault, quench-related protection)
* Select power semiconductors (IGBTs, MOSFETs, diodes), magnetics, and passive components
Magnet System Support
* Support powering, ramping, and steady-state operation of superconducting magnets
* Understand magnet load characteristics, inductive energy storage, and fault conditions
* Interface with quench detection and protection systems
* Contribute to safe operating procedures and interlock systems
* Support commissioning and troubleshooting of magnet power systems
Control & Digital Electronics
* Design control electronics for power converters (analogue and digital)
* Implement digital control using microcontrollers, DSPs, or FPGAs where appropriate
* Develop interfaces for monitoring, diagnostics, and remote control
* Support firmware integration and debugging in collaboration with embedded software engineers
PCB Design & Hardware Integration
* Design schematics and oversee PCB layout for power and control electronics, preferably with Mentor Graphics experience.
* Apply best practices for high-current routing, creepage/clearance, grounding, and isolation
* Address EMC/EMI challenges associated with high-power switching systems
* Work closely with mechanical and thermal engineers to ensure effective cooling and packaging
Prototyping, Testing & Commissioning
* Build, test, and debug power electronics prototypes
* Develop and execute test plans including load testing, thermal testing, and fault testing
* Use laboratory and high-power test equipment (power analysers, oscilloscopes, current probes, HV test equipment)
* Support system commissioning and on-site troubleshooting as required
Documentation & Compliance
* Produce detailed design documentation, test reports, and operating manuals
* Support compliance with relevant standards (e.g., electrical safety, EMC)
* Generate BOMs and support component obsolescence management
* Contribute to manufacturing documentation, DFM/DFT, and supplier technical engagement
* Experience of IEC60601 for Medical Electronics
Hands-on experience with laboratory and high-power test environmentsProficiency with schematic capture, PCB design, and simulation tools
Required Qualifications
* Bachelor's or Master's degree in Power Electronics, Electrical Engineering, or related field
* Strong experience in power supply and power converter design
* Proven understanding of:
* Current-regulated power supplies
* Control loop design and stability analysis
* High-current and high-energy systems
* Electrical safety and fault protection
Desirable Skills & Experience
* Direct experience with superconducting magnets or accelerator/physics power systems
* Experience with quench protection or magnet safety systems
* Experience with precision, low-noise power supplies
* Familiarity with cryogenic environments and their electrical implications
* FPGA, DSP, or digital power control experience
* Embedded C/C++ or control firmware experience
* Experience in research, scientific, medical, or large-scale industrial facilities
Key Competencies
* Strong analytical and systems-level thinking
* Safety-focused design mindset
* Ability to work with complex, high-energy systems
* Methodical fault-finding and root cause analysis skills
* Clear technical communication and documentation skills
* Effective collaboration with multidisciplinary teams
Working Environment
* Hands-on engineering role involving high-power laboratory systems
* Close collaboration with physicists, systems engineers, and safety specialists
* Involvement across the full system lifecycle, including commissioning and operational support
If available please submit CV and a member of the team will be in touch.
Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.
#J-18808-Ljbffr