The ELMG Blog

ELMG Digital Power July Webinar APEC 2017 Part 2 – Free

APEC 2017 Professional Education Seminar

This year the APEC was in Tampa and ELMG Digital Power’s Hamish Laird presented a Professional Education Seminar.


This coming month, on Thursday July 27 at 12 noon California time (3pm Eastern) ELMG Digital Power are offering you the opportunity to attend an hour webinar of the three part ELMG Digital Power APEC 2017 Professional Education Seminar. (This is the second in a three part presentation.)

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

Register here – click


Dr. Hamish Laird achieves Xilinx Alliance Program Certification

Xilinx Alliance Program Certification Commitment

As part of their commitment to the Xilinx Alliance Program Certification ELMG Digital Power CTO and founder, Dr. Hamish Laird has completed Xilinx Certification.

When asked about this Dr Laird said

“As part of ELMG Digital Power’s continuing commitment to Xilinx, the Xilinx Alliance Program and the fantastic technology that Xilinx provides I am excited to complete this training and achieve Certification.  We see great things happening with Xilinx All Programmable FPGAs and Zynq SoCs.  It was great to see the capability of the UltraScale technology and to see the progress and extension of the Vivado Suite.  We are really pleased to continue our Xilinx Alliance Program commitment and are please to be part of the Xilinx community.”

Xilinx Alliance Program Certification certificate for Dr. Hamish Laird

Xilinx Alliance Program Certification

Dr Laird continues

“We are very pleased and proud of our Xilinx Alliance Program membership and for the value that it lets us bring to our customers.   Training for key people in our organization is essential for us to continue to help our customers with FPGA and other All Programmable solutions.  Our IP blocks, power electronics know how and ability to deliver solutions are our key areas of focus.”

Contact ELMGDigitalPower now.


Equivalent bits – a question from LinkedIn Group

“I was looking through ELMG’s tutorial “Three Key Issues to Watch out for in the Digital Control of Power Electronics” ( and am having some trouble understanding the relationship between frequency, register size, and equivalent bits.

An example given in the “2. Timer Precision” section of the document reads:

‘Consider the case where the timer clock runs at 40MHz. If the variable period oscillator register has 256 bits then the maximum frequency that the VPO can make is 10MHz and the minimum is 39.0625kHz. The example LLC resonant power converter needs a variable frequency of 500kHz to 210kHz to perform the control. This means the VPO count register has a usable range from 80 to 191. This is 111 counts which is 6.8 equivalent bits or almost seven bits.”

Equivalent bits are a great way to look at numeric precision.

Come join the discussion to see how equivalent bits is calculated.



A question about LCL filter

I’ve got a situation where I have a generator hooked up to a rectifier doing space vector control. The rectifier has an LC filter. Inductor current and cap voltage is measured. The L from the generator makes up the second L. I didn’t put a virtual damper in the fpga code (like I should have) and am trying different things. This is only a prototype so just working is the main thing. Which would be the best way to go in my current situation?

*pole cancellation in the digital controller (in dq and 0 components)
*Adding a physical damping resistor to the filter cap
*increasing filter cap
*removing filter cap (voltage Pll seems to track fine on HIL and simulation but haven’t tried on power hardware)

Sorry about posting too much, but I’m thankful for any suggestions!

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

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.


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