Power Electronics

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Anderson, Antony

Consultant Electrical Engineer: failure investigations: expert witness

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Services Provided:

An independent consultant electrical engineer and expert witness with extensive experience of electrically-related investigative work that has successfully supported litigation and dispute resolution. He investigates and reports on unusual electrical problems and on the causes of electrical machine and control system failures. He offers ideas and solutions that improve design/manufacturing processes.

Armstrong, Keith

Interference and safety: design, training and solutions

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Services Provided:

Training, design and problem-solving services in EMC, EMI, RFI, Interference, Emissions, Immunity, Susceptibility, Electromagnetic Interference, Safety, EMC for Functional Safety and EMC Risk Management.

For every type of device, module, product, equipment, vehicle, appliance, apparatus, machine, sub-system, system or installation.

For reducing financial risks, increasing profits, increasing uptime, improving safety, or achieving regulatory compliance (e.g. EU Directives such as EMC and LVD).

Hill, John

Expert witness, technical analysis, design reviews in electric railway traction, power systems, signalling and EMI/EMC

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Services Provided:

Expert witness, design review, technical audit & QA functions for electric railway engineering industry and railway operators. Special focus on vehicle electric traction drives, fixed traction power systems, railway signalling & communications, rail system integration and EMI/EMC.

Yardley, Russell John

Power electronics consultant

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Services Provided:

The services of myself, Russell John Yardley, I supply via my company, Northstead Design Ltd.
My main area of expertise is Power electronics and its control and in particular
Switched mode power supply design. (SMPS).
Related to this I get involved in the design of transformers and inductors for bespoke power supply design.
Prior to branching off as a freelance electronics engineer I worked for the following company's as an electronic
design and development engineer:-
GEC Industrial Controls (Kidsgrove 1982-1986)
Powernetics (Loughboro 1986-1990)
Pektron (Derby 1990-1992)
Erskine Systems (Scarborough 1992-2000)
(After this, until the present, Northstead Design Ltd, my own Company)

Typical services I offer are:-

• Electronic Circuit Design
• Consultancy/Advice:- As and when needed priced by the hour/day.
• Existing products and support issues

• Electronic/product design reviews
• Electronic equipment FMEA’s and single fault test plans
• Power electronics design/development and assistance in the same.
• Switched Mode Power Supply (SMPS) design and development assistance.
• Circuit simulation and feasibility studies.
• EMC compliance troubleshooting assistance
• Technical documentation. Product specifications, test specifications, product operating specifications, circuit design description.
• Test procedures.
• Design Review assistance (from a 3rd party point of view)
• General electronic development “bench” testing
• Design and verification testing
• Component reliability issues
• Design to cost exercises
• Product failure investigations
• PCB layout assistance
• Embedded micro and associated firmware
• Component obsolescence issues
• Product specifications
• Product compliance work
• Product reliability improvements
• Component reliability issues (Failures attributed to component manufacture, product design issues, manufacturing issues).
• Alternative component approval including verification testing and ruggedness evaluation
• Existing product support issues
• Temporary electronic design/development engineer hire at “busy times” or fill in if any of your own design engineers leave or are temporarily off sick/away.
• Pick up the pieces of a project if your electronics design engineer leaves you “without a paddle”
• Full design “fit for purpose” reports on your electronic products. Advance warning of potential weaknesses/design issues which could cause failure returns or dangerous issues in the field.
• SMPS topology choice decisions.
• Analogue, digital and Power electronics design/development/troubleshooting.
• Design of transformers, inductors (chokes) for power conversion or filtering. Ferrite, powder, iron cored etc. Design down to individual “copper” and core geometry/type.
• Power electronics/Power supply education and training.
• Customer support issues.
• OEM , power supply/equipment sourcing and choice issues
• Design/development engineer recruitment personnel assessment reports. Vetting the suitability and capability of prospective design engineers/technicians your HR department are looking to recruit.
• Project management
• Expert witness consultation, reports and related services
• Electronic equipment diagnostics and repair

Power Electronics

Anderson, Antony

Armstrong, Keith

Hill, John

Yardley, Russell John

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