Archive for the ‘Digital Issues’ Category

What do you think the biggest issue is when diving into digital control?

Saturday, February 25th, 2017

What do you think the biggest issue is when diving into digital control

This from D.P. -Lately to me it seems the biggest issue is maintaining a sustaining capability to the company where it is introduced. It requires at least one person that is decent at digital control design and then a team people that can implement. One person that can translate simulation to code, one person that can do state machines, one person that can do communications, etc. Lay on top of that maintenance and so on, it becomes a decent chunk of work.

Also digital technology changes so fast these days it can sometimes be difficult to keep up so you can take advantage of the advancements in processing capability and test capability. Many companies seem to fall behind because they don’t want to abandon their code base.

And this from J.F. – My take on this, as a former digital design engineer that now manages a power design group, is that it takes a very different mind-set to switch from analog power design to the SW/FW coding effort that it takes to implement the digital control algorithm. Since this discipline and way of thinking is foreign, it can be a major hurdle depending on the length of time the individual has been performing power design. Some of my folks are having an easier time to make this transition than others, but all are struggling to come up the learning curve.

These answers and more in the Linkedin discussion group.

DIGITAL CONTROL OF POWER ELECTRONICS – A FOUR DAY TRAINING WORKSHOP

Monday, January 16th, 2017

ELMG Digital Power invites you to register for our tailored training course, ‘Introduction to the Digital Control of Power Electronics’ to be held in Camarillo, California on January 30th – February 2nd 2017.

ELMG Digital Power INC – Empowering you to achieve the Digital Control advantage

Register here

Hands on Course

This hands-on course aims to provide engineers with solutions to the key issues in digital signal processing, using microcontrollers, microprocessors, DSP and FPGA. These solutions can then be employed effectively in the control of power electronics.

Over the four-day course, split into morning and afternoon sessions, participants will be provided with targeted training on digital power electronics control covering the detail of both digital control and power electronics and how they go together.  They will gain the ability to close a digital power converter feedback loop in a stable fashion by following repeatable easily understood steps, as well as techniques to understand what the effect digital control’s limited bandwidth, processing power, number of bits and dynamic range have in digital power electronic control.

What you get from the course?

Engineers who attend the course will gain in-depth knowledge of the interaction of power electronics and digital control; this includes sampling and aliasing in the context of fixed and variable frequency switching power converters. There will be take away methods and steps to solve design issues such as one sample noise, precision limits in filters and controllers, non-linearity, quantization and other digital effects.  A copy of the slide slide presentation course booklet covering the material presented and lunch each day will be provided.

Introduction to Digital Control of Power Electronics

The 30 engineers who completed the Digital Control of Power Electronics Course August 2016

Who is the course for?

The course has been specifically designed to meet the learning needs of engineers, regardless of whether you are:

  • a practicing power electronics engineer,
  • an experienced engineer moving into the area of digital control of power electronics,
  • a software engineer working in digital power control teams,
  • a firmware engineer involved in FPGA development in digital power control teams,
  • a mid-career engineer transitioning from analogue control to digital control, or
  • a recent graduate with some experience (<5 years) and looking to up skill in the area of digital control.

Register here

The course will be presented and led by Dr. Hamish Laird, Principal Engineer at ELMG Digital Power. An extremely well-regarded teacher, engineer, researcher and public speaker, Hamish works in developing digitally controlled power converters and controllers for converters. He is the author of seventeen academic papers on digital power electronics and power quality and has taught previous digital power courses at Camarillo.

Introduction to Digital Control of Pwoer Electronics - Four Day Training Workshop

Dr. Hamish Laird at the Camarillo Ridley Engineering Design Center

Tradeoffs in ADC feedback setpoint for digital control

Wednesday, November 16th, 2016
New post on our linkedin group

New post on our linkedin group

This new discussion in our the Digital Control LinkedIn group.

Tradeoffs in ADC feedback setpoint for digital control

Come join the discussion at https://www.linkedin.com/groups/6677852 and get the best views from the industry.

Great question.

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