Archive for the ‘Power Electronics’ Category

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





 

Latching digital PWM – good feature or bad feature

Sunday, August 7th, 2016

 

This from a discussion in the Digital Power Electronics Control Group on Linkedin 

‘I was wondering if you could explain what you mean by “…ensuring that the PWM does not latch at the switching speed (very important for wide bandwidth)”. Isn’t the PWM comparator by nature a latch? Are you implying for best performance one should not use PWM shadow registers but rather do ” immediate” PWM updates?’

Latching digital PWM – good feature or bad feature?

Hamish from ELMG Digital Power

‘D. – I am not implying that latching is necessarily completely bad. Latching does have some uses as it provides another place in the system where you can reduce the effect of “aliasing in time” on transients. That said if you use a latching PWM then it is clear that you add delay. Whether this matters for your control depends on the bandwidth aim you have and whether you have designed a system that has low margin due to its power converter. But generally we always use our PWMs wide open with no latching delay to minimise the phase we get. We sample faster than the switching frequency and use the PWM as a down sampler. It means you need to take care of the “aliasing in time” elsewhere and be careful about intermod product magnitude from other non linearities in the loop – low pass filters are required along with a bit of modulation know how. Very doable and looks like magic when you need more bandwidth.’

Come join the discussion on all things Digital Power in the Digital Power Electronics Control Group

Latching digital PWM - good feature or bad feature

Look for the LinkedIn Group with this identifying z domain function.

Zynq Webinar Presentation Slides

Wednesday, July 27th, 2016

Dr. Tim King presented the Digital Power Control on a Zynq webinar.

In the presentation Dr. King detailed how the programmable logic fabric of the Zynq was fantastic for low latency and high precision digital power control.

zynq webinar presentation slides

What to do with the ARM A9 Cores?

He also outlined how to make use of the ARM A9 cores

The Zynq webinar presentation slides

The slides are available here


Download presentation




 

Three Day Digital Control Course August 22-24 California

Friday, July 22nd, 2016

The ELMG Digital Power Electronics Control Course

Three days of focused unique training in digital control of power electronics!

Our Digital Power Electronics Control Course overs the essential knowledge and know-how for engineers to implement digital power electronic control!

Come to the Three Day Digital Control Course in Camarillo, California August 22-24, 2016.  Register here.

How did the course came about?

Essentially the course came about because we were asked by one of our customer’s to provide one. The story is we were in the middle of a “fix up” job where the power supply had shown some control instability at its final release testing. The testing that showed the problem was passing a short circuit test of parallel connected power supplies. When the short circuit was removed the supplies came out of current limit, however they did not come out of the limit at exactly the same time. This created an oscillation where individual power supplies came out of current limit and then returned to current limit.  It was possible for the oscillation to continue indefinitely.  This was an unacceptable and embarrassing problem.

Six months of expertise in a three day course

During the six month project to rework the control code we spent lots of time teaching the team about the underlying issues that had been missed when the controller had been designed, coded and tested.  And part way through the “fix-up” the R and D manager suggested we could put a course together covering all that the team needed to know.

And so the digital control course was born

The first course covered exactly what we had discovered during the fix up job.  This included lots of digital expertise targeted for power electronics.  The areas we covered were diverse from;

  • Numeric precision loss in filters
  • Improvement of modulation spectral performance
  • Stability
  • The effect of numeric precision on stability
  • Best filter forms
  • Direct digital control design
  • Linearising control loops

What is covered in our course?

The course was created at the request of a Power Electronics Research  and Development manager.  He asked that we make it specific his team’s needs.  And this is why the course has the unique structure that it has.  We have been through the pain and heartbreak of having digital control development go wrong and have seen clearly where the repeated problems lie; our course addresses those areas.

Digital PWM and VPO modulators

One of the big differences between digital power electronics control and conventional analog control is the timer precision in digital modulators. This difference can be corrected or made negligible and in some cases can be made an advantage.  Spectral control in digital modulators is a focus area in the course as it is so effective.

Digital Precision in control blocks

It is possible to use a digital system and adjust the coefficients of the filters so that small inputs result in no output from the filter. Such scaling issues often lead to a loss of precision in the digital control system. The resulting slip-strike behavior can create limit cycle oscillations in the power converter output.

Direct Digital design of controllers

The “design then translation” approach of taking analog controllers to digital form can be avoided by using the direct digital design approach. This simple but powerful method of digital control loop design is covered in the course.

Converter non-linearity correction

Certain converter topologies are non-linear either in the control input to the output or the conversion ration.  Dealing with the converter non-linearity to achieve high bandwidth is key to stable parallel connected converters.

Stability

The course covers the fundamentals of stability from a physical basis with a focus on measurements of power converter transfers.  This along with a simple framework for managing margins and robustness is an integral part of the course.

Why we offer the course?

Understanding and implementing digital control of power electronics offers great advantages for configuration and flexibility. However, this is not without road blocks and issues that need to be designed around. This course provides the know how to get digital control working robustly and reliably.

How do I get on the course?

The course is next being run in Camarillo, California USA August 22-24.  To register for the course, click and visit the information page here. Press the ‘Register’ button on the page and this will take you to the shopping cart for the course. Complete the purchase to register for the course.

Next course

The next course is being held August 22-24 in Camarillo, California, USA.

Hotels

HOTELS

There are several hotels a short distance from the Ridley Engineering Design Center. The prices below reflect their current prices for August 2016. The last hotel listed is a nice beachfront resort if you do not mind the 25-minute commute to the office. Regardless of your selection, we recommend arriving on Sunday evening and departing Wednesday evening or Thursday.

 

Best Western Inn

295 E Daily Drive, Camarillo

0.3 mi.

805-987-4991

$100/night

Book.western.com

Residence Inn by Marriott

2912 Petit Street, Camarillo

2.8 mi.

805-388-7997

$185/night

Marriott.com

Courtyard by Marriott

4994 Verdugo Way, Camarillo

4.3 mi.

805-388-1020

$180/night

Marriott.com

Hampton Inn & Suites

50 W Daily Drive, Camarillo

1.1   mi.

805-389-9898

$175/night

Hilton.com

Hilton Garden Inn

200 Solar Dr., Oxnard

5.6 mi.

805-983-8600

$155/night

Hilton.com

Embassy Suites Mandalay Beach Resort

2101 Mandalay Beach Rd., Oxnard

15.4 mi.

805-984-2500

$200/night

Hilton.com

Travelling to the course

Transportation

Airports: There are three options for airports. Bob Hope Airport in Burbank will be the least congested and is serviced by American, United, Delta, Southwest and JetBlue:

Bob Hope Airport (BUR)

Los Angeles International Airport (LAX)

Santa Barbara Airport (SBA)

Shuttle: The Roadrunner Shuttle is a Camarillo-based service that provides door-to-door service from the airport. www.rrshuttle.com

Driving:

Bob Hope Burbank Airport (BUR) via US 101

https://goo.gl/maps/caMGB9QSEqP2

Los Angeles International Airport (LAX) via US 101

https://goo.gl/maps/kRBDQifyVfM2

Los Angeles International Airport (LAX) via Pacific Coast Highway (PCH)

https://goo.gl/maps/XPbBhNQYTzj

Santa Barbara Airport (SBA) via US 101

https://goo.gl/maps/2fGP3K7FMZx

About the presenter

3 Day Digital Control Course

Dr. Hamish Laird

Dr. Hamish Laird is a well regarded digital power electronics control engineer, researcher, lecturer and teacher.  Hamish is Chief Technology Officer at ELMG Digital Pwoer and holds a visiting academic position at the University of Canterbury in Christchurch, New Zealand.

During his career Dr Laird has worked on the control for;

  • High Voltage Direct Current Transmission
  • Reactive Power Compensators
  • AC and DC Motor Drives
  • DC to DC converters including LLC and phase shifted bridges
  • Medium and low voltage AC motor starters

Dr. Laird has worked for;

  • Alstom Grid (GEC Alsthom)
  • Eurotherm Drives
  • University of Canterbury
  • Aucom

Through ELMG Digital Power Dr. Laird  has provided advice, services and products to;

  • ABB
  • Enphase
  • Comsys
  • Evashred
  • TNEI
  • Eaton

Dr Laird says

“In designing and presenting the course we aim to have engineers able to use digital control in power electronics to achieve robust and reliable results.  See you in Camarillo”.

 

How to Register

Click here to register.  

P.S. Please note that the ELMG Digital Power course is being hosted at the Ridley Engineering Centre in Camarillo, California.  Ridley Engineering are processing all course registrations viatheir webstore.  Click here to register.