Archive for the ‘Power Electronics’ Category

Inductor Go Round – Redux

Wednesday, May 9th, 2018

ELMG Redux from 2010

This post was originally published in 2010.  It is republished here because it looks like people are still doing the inductor-go-round.

So what is the inductor-go-round?  It is like a merry-go-round (carousel) except with inductors.  It can cost companies (or their startup backers) lots of time and money.  And usually when you are on the inductor-go-round it feels much like a carousel at a fair.  Round and round and sadly, not much progress.

Power Converters

Often the optimization of a power converter’s performance comes down to the optimization of the converter inductor. (It can also be optimization of the transformer but lets for the moment assume a non-isolated converter). For people with big and small inductors there is, it seems, an inductor go round.

What is a big inductor? At ELMG Electronics Design and Development we generally say that any inductor with mass more than 1 kg – and yes it says kilograms (1kg = 2.2 pounds) – is a big inductor. Some of you will say that until you have a 40kg inductor you don’t really have an inductor. Other inductors will be smaller.  I guess it is all a matter of what you are familiar with.

For the inductors for grid connected inverters people start with laminated iron or some other laminated material.  This is typically the  inexpensive choice.  Some others choose ferrite cores. Some start with another core material.

Air cored next

Then running first into core material problems they then move to air cored as the core is the cause of all the problems. They then either come up against either;

  • the magnetic field interference problem (the enclosure is now the core),
  • the fault rupture problems that occur with designing air cored mechanical restraints,
  • or the size constraint.

Powdered?

From here most people head to a modern core material such a powder core. These materials are not necessarily homogeneous and so they then realize that to get long life times requires careful consideration of the wear out mechanisms and to meet this requirement means using a quality core material vendor (See www.micrometals.com/thermalaging_index.html for a good first discussion on thermal aging). The lesson here is that not all core materials are the same.

Back again

At this point some people go back to iron or ferrite and others go to an alternative core material like an amorphous alloy. If they then cannot meet the price point then they may well go back to laminated iron.

At this stage the realization is that there is no magic answer. The optimization of power inductors becomes the requirement and there is usually a realization that the inductor vendors are not as able as they seem. In the defense of the inductor manufacturers it must be said that most power electronics companies struggle to correctly specify inductors.

Getting off the inductor go round means designing the inductor completely.

Power Electronics Digital Control Webinar Schedule for 2018-2019

Tuesday, May 8th, 2018

We are pleased to announce the 2018 power electronics digital control webinar schedule for ELMG Digital Power.

These free webinars are the best chance to be among the best digital power electronics control engineers in the world.

The sessions cover the need to know details of Digital Control of Power Electronics and include a question and answer session after the webinar.

Power Electronics Digital Control Webinar Schedule

Make a note of the dates.

Tuesday May 1 Digital Control of Power Electronics using Zynq …[sign up here]
Tuesday June 5 What you need in a development platform for Digital Power Electronics…[Sign up here]
Tuesday July 3 Designing and Implementing Digital Integrators
Tuesday August 7 Using Simulation Tools effectively in Digital Power Electronics Development.. [Sign up here]
Tuesday September 4 Measuring Power Converter Control Transfers
Tuesday October 2 Basics of Digital Power Electronics Control – Where to Start
Tuesday November 6 How to choose your control processor for Digital Power Electronics
Tuesday December 4 Frequency Domain Control Design for Digital Power Using SciLab
Tuesday January 8 2019 Precision Correction in Digital PWM Modulators
Tuesday February 5 2019 Filter Structures for Digital Power Electronics Control
Tuesday March 5 2019 Fractional Step Digital Filters
Tuesday April 2 2019 Development Structures for Firmware and Software in Digital Power Electronics
Tuesday May 7 2019 Grid Synchronization with PLLs

We’ll remind you of the time, dates and where to sign up by e-mail.

The webinars will be presented by ELMG Digital Power CTO, Dr Hamish Laird.

Power Electronics Digital Control Webinar Schedule

Dr. Hamish Laird at the ELMG Digital Power Camarillo Office

Frequency Responses for Control

Monday, September 25th, 2017

ELMG Digital Power are offering you the opportunity to attend our regular webinar on Digital Control in Power Electronics.  This month’s webinar is titled “Frequency Responses for Control”.

This is an hour webinar covers

  • understanding frequency responses for control
  • how to use frequency responses for control in design of power converters

Thursday 12th October at 12 noon California time (3pm Eastern).

Webinar – Frequency Responses for Control.

 

Join ELMG Digital Power’s regular monthly Digital Power Webinar and expand your Digital Power knowledge and expertise.

The webinar will be hosted and presented by Dr. Hamish Laird. Hamish is ELMG Digital Power’s CTO and presenter and teacher of the Digital Control of Power Electronics Workshop. He has 25 years experience the design and implementation of varied digital control systems and IP for power electronics.

This exciting opportunity is free and includes a 15 minute Q&A session with Dr. Hamish.

Frequency Responses for Control

Converter Frequency response from Analyzer Measurement

 

 

 

 

 

 

 

 

The webinar is scheduled for Thursday 12th October at 12 noon California time (3pm Eastern).

Click the link below to register.  Spaces are limited.

https://info.elmgdigitalpower.com/frequency_responses_for_control

Frequency Responses for Control

Converter Frequency Response from Self Measurement

Digital Power LinkedIn Group – 1500 members

Saturday, January 14th, 2017

Digital Power LinkedIn Group

We run a Digital Power LinkedIn group where  ideas about Digital Power Electronics Control are discussed.

The link to the group is https://www.linkedin.com/groups/6677852

The group now has more than 1500 members.

Come and join the discussions.

LinkedIn Group Now with 1500 Members - Digital Power LinkedIn

More than 1500 Digital Power Fans!

Latest discussion include Digital Power Electronics in Spain and available training course.

ELMG Digital Power INC In California

Monday, November 14th, 2016

ELMG Digital Power Inc has long held the ambition of being the best digital controlled power electronics design company in the world.

And, to that end, we are pleased to announce that we are extending our operations to include a development and support site in Camarillo, California.

ELMG Digital Power has established this base in Camarillo, California to allow us to be well-positioned to support the increasing growth of digital power electronics control in California and across the country.  The team of engineering staff will be available to meet the needs of nationwide clients, who will also have access to all the available expertise and resources of ELMG Digital Power’s global team.

ELMG Digital Pwoer Control Platform Technology enables real time logging and visualization of waveforms from around the world or across the lab via the ethernet.

ELMG Digital Power Control Platform Technology enables real time logging and visualization of waveforms from around the world or across the lab via the ethernet.

ELMG Digital Power is committed to the provision of support, technology, know-how and products that will enable our clients to be respected authorities and do great thing in the area of digital power control.

Our clients can certainly have confidence in ELMG Digital Power’s expertise and experience as for the past twenty five years we have been working on digitally controlled power converters in motor drives, industrial switch mode power supplies, reactive power compensation, medium voltage system, power quality systems, motor starters, appliances and telecom switch-mode power supplies. ELMG Digital Power places a high value on innovation, safety and sustainability. Quality is one of our cornerstones, and even as we seek to streamline, update and improve, maintaining quality and reliability remains paramount.

ELMG Digital Power’s Eco System Approach of design, development, know-how sharing through training and partnerships is our principal methodology.  We are proud of our successful Eco System of solutions, training, support and long term partnership.

Digital Controller logging implementation

Digital Controller logging implementation

Some of the companies involved in the control and measurement of electric power we have worked closely with include (Click for testimonial or details)

Dr. Hamish Laird at the ELMG Camarillo Office

Dr. Hamish Laird teaching a class at the ELMG Camarillo Office

As well as providing world-leading FPGA based digital power electronics controller technology, ELMG Digital Power have developed products used in a variety of applications all around the world. These include

  • power transmission,
  • off-shore wind turbine DC Connection systems,
  • grid scale energy storage,
  • internal combustion engine management systems,
  • traction systems for ships,
  • communication links for power electronics
  • solar inverters
  • high voltage motor starters and
  • high voltage UPS to name just a few.

More detail on ELMG product development and systems, our key know-how and technologies can be found on our website here 

zynq webinar presentation slides

ELMG Digital Power is a Xilinx Alliance Program member providing world leading FPGA based digital power control platforms

We are excited and pleased about this new venture and look forward to discussing and supporting your digital power electronics design and technology needs from our new location at:
601E Daily Drive, Suite 112,
Camarillo, CA 93010
Phone: +1 805 764 2027
For more information contact ELMG Digital Power INC in California:

Louise Jennings

enquiries@elmgdigitalpower.com

Advanced Digital Control Power Electronics Course

Wednesday, October 19th, 2016

Digital Control Power Electronics course – January 30 to February 2

The next Advanced Digital Control of Power Electronics training course is running in

Camarillo, California

January 30 to February 2

Registrations open now – click here or on the button below


Register now


Course outline is here.

Four days

The course has been expanded to four days and includes lab sessions each day to reinforce the learning on

  • Precision extension of Digital Modulators
  • Digital Loop closing
  • The effects of delay
  • Loop measurement using the control processor.

What people who have attended say about the course?

“Had very high expectations of this course. Hamish delivered. Excellent for power engineers who are starting digital power. Thanks for putting this on…I only regret it is a 3 day course. I could sit here for 3 more days”

“This course was full of critical material not found in the app notes.  Very enjoyable and well taught.”

“Good course. Hamish knows his material. I’ll be able to apply this coursework to my work.”

 

“I would highly recommend the ELMG digital control course to all power electronics engineers.  What makes this course particularly valuable is in the practical approach and relevance to the control of power electronics.  The topic of digital control is a very broad subject and hence the specific challenges and applicable tools are very different depending on the application details. Many digital control / DSP courses try to approach the topic from a very generic broad approach, treating all applications in the same way.  The classic approach involves starting from a conventional analog control model and then adding ADC and DAC blocks to change between the analog and digital domains with a digital controller replacing the traditional analog controller. The problem with this classic approach is that it is not a practical or applicable method for designing high bandwidth controllers for use for the control of power converters. The ELMG digital control course specifically focuses on the control of power electronics and hence the course only considers concepts and techniques that are applicable to the control of power electronics.  The course covers a wide range of digital control theory and introduces the power electronics engineer to all of the state of the art digital control concepts.  This course is a must for any power electronics engineer who is involved in the digital control of power converters.”

Michael Harrison – Director of Power Conversion, Enphase.

Register by clicking below





Register now