Successful Endeavours - Electronics Designs That Work!

Electronics Products


Smart Cities

This follows on from our look at Smart Cities and the technology mix being considered for how you implement them. For this post we will look at the development of a Smart City Telemetry sensor suite and the ICT communications that go with it. This is also a classic IoT case study.

I also want to point out that a Smart World will only happen if we have Smart Regions, Smart Countries, Smart States or Territories, Smart Cities and Smart Neighbourhoods.

arcHUB

My thanks go to The Active Reactor Company for giving me permission to share their story about the development of the arcHUB Telemetry sensor suite which is aimed at the Smart Cities programs as well as being more widely deployable.

arcHub Telemetry Module

arcHub Telemetry Module Logo

A few days ago I had the opportunity to speak with Daniel Mulino who is the State Member for Eastern Victoria. The picture below comes from his visit to our office in Narre Warren. The original post he made along with my explanation is here. I’m giving a more detailed explanation below including some history.

Ray Keefe - arcHUB - Daniel Mulino

Ray Keefe – arcHUB – Daniel Mulino

For those wondering about the device I am holding, it is an arcHUB Smart Cities Telemetry module aimed at Smart Cities projects and environmental monitoring where you don’t have access to, or want the cost of, connecting up mains power. This is designed for The Active Reactor Company and is already involved in 1 Smart Cities deployment and multiple trials of low cost sensor modules by councils and government agencies in 3 states. I can’t yet provide specific details on those as they are covered by non-disclosure agreements.

To understand how we got here, it helps to know the history.

The Active Reactor Company make a product called The Active Reactor. It improves both the efficiency and the life of arc lamps such as low pressure sodium street lights, high pressure Sodium  and metal halide lamps.

The Active Reactor

The Active Reactor

With the advent of LED street lighting their current product is not needed for new installations and so they wanted to secure the future of the business. So a great example of addressing an issue that will arise in the future so you are ready for it rather than just reacting to it once it happens.

Initially the new product was aimed at monitoring LED street lights. One of the big issues with LED lighting is that the LEDs either fail over time or they fade and lose brightness. Or a mixture of both. The fading is a result thermal diffusion in the semiconductor substrate. When they fall by more than 30% then you have to address that as they no longer comply with legal standards for lighting levels. The other catch is that the claimed life of 10+ years isn’t yet proven and so it is expected that there will be many lights that fail early or fade early or both.

Of course, once you have a communicating device that can monitor one thing and report it, it can also monitor other things and report them as well. Plus there were issues with being allowed to monitor the light. And where would the power come? Their inquiries with authorities responsible for the poles would not give permission to tap the power in the pole or light.

So this set us the follow set of constraints to work within:

  • must be battery operated
  • easy to install
  • low cost to make and also run
  • communicate using the cheapest data transport
  • monitor the LED light at night and keep track of the brightness trend
  • send an alert when it is persistently out of specification
  • field life to match the street light (10+ years)

As The Active Reactor Company talked to target users (initially the same people who buy their current product) and got an idea of what they wanted, a very different picture emerged. The people who cared about LED street lighting, also cared about micro climates, and soil moisture levels, and air quality, and foot traffic, and …

So that lead to a change of direction and a look at what else was required. The result is a device aimed at the Smart Cities market that also suits a wide range of other end customers and has the following features you won’t find combined together in conventional devices:

  • battery operated (either solar charged or primary cells)
  • minimum 2 year battery life for standard AA cell alkaline batteries
  • 10+ day running time if solar charging is lost
  • up to 20 days on board non-volatile storage
  • compact form factor
  • multiple sensor types per node (up to 20)
  • sensor area network to minimise data costs
  • over the air firmware upgrades
  • over the air configuration updates
  • variable sample rates and upload timing
  • still has to be low cost to make and also run
  • easy to install

So here is the range of sensors already trialed:

  • wind speed (external anemometer attached)
  • sunlight level
  • night light level (street light monitoring etc)
  • temperature
  • PM2.5 particulate levels
  • PM10 particulate levels
  • Gasses – CO, H2S, SO2, NO2, H2S
  • Humidity
  • People counting (PIR based anonymous counting)
  • Soil moisture levels (external probe)

It is also the HUB and coordinator of a Sensor Area Network that can include modules that can measure any of the above as well as:

  • vibration
  • shock
  • movement
  • water level
  • GPS location
  • USB charger current (for usage analysis)
  • counting any device or system that has a pulse output
  • analog voltage measurements (AC and DC)
arcHUB trial at Fitzroy Gardens

arcHUB trial at Fitzroy Gardens

The arcHUB is solar powered and includes a cellular modem to allow reporting back to a web service. It is designed to mount to a pole using straps but can easily be mounted to a wall or any other typical structure. A typical scenario is measurements every 15 minutes (except people or pulse counting which are continuous) and uploading to the web service every hour.

With the release of CAT-M1 services across Australia by Telstra, we are expecting migrate to this communications standard because it will reduce power consumption by at least a factor of 4 which will further improve battery life.

Quectel BG96 CAT-M1 Module

Quectel BG96 CAT-M1 Module

The arcHUB Peripheral Modules connect via 915MHz ISM Band communications and use standard AA batteries. They can run for between 2 and 5 years depending on what sensors are attached and how often they are read and reported. If you used primary lithium cells then you can expect life beyond 10 years.

The arcHUB Peripheral Modules are also capable of stand alone operation with the addition of an internally fitted cellular modem so you can have a portable people counter module that can be easily moved to a new location and doesn’t require an electrician to install it.

And pretty exciting to also announce that this is not only a designed in Australia product range, but it is also a made in Australia product range.

Again, my thanks to The Active Reactor Company for permission to share this story and if you want to know more, leave a comment and I will put you in touch with them.

Successful Endeavours specialise in Electronics Design and Embedded Software Development, focusing on products that are intended to be Made In AustraliaRay Keefe has developed market leading electronics products in Australia for more than 30 years. This post is Copyright © 2017 Successful Endeavours Pty Ltd.

Manufacturing Profits you can retire on

I was talking with one of our past clients a little while ago. They told me they had a problem. They said, “Ray, I nearly retired“! So I asked them what that meant. And they explained.

We had developed a product for them a decade ago. The total project cost then around $50,000 as it included both the product Electronics Design, Embedded Software and also the Automated Test Equipment (ATE) for Production Test which also had an Electronics Design, Embedded Software and Windows PC ATE Software component to it. And from that product they made nearly $2,000,000 in retained profit. From their perspective, nearly enough to retire on. And since they own the company it is theirs to distribute as they please. Now they wanted to do it again. So we are onto another very exciting Product Development for them. Can’t say any more about that yet.

So I though about the value proposition here. The maths says:

2,000,000 / 50,000 = 40:1 Return On Investment (ROI).

And that ignores the total value of the economic activity and profits their suppliers and customers have made.

Return On Investment (ROI)

Return On Investment (ROI)

Manufacturing Spearheads Economic Growth

The Victorian Government estimates that every $1 spent with a business like Successful Endeavours, there is $100 of overall economic value generated for the state. Makes you wonder why they don’t invest themselves? They used to through things like the Technology Voucher Program but all of that is currently shut down.

And of course there are the jobs this generates. Again, Victorian Government estimates are that every job in manufacturing creates another 5 jobs around it in the supply chain and supporting businesses. That is the highest ratio of any industry.

So what’s not to love about Australian Manufacturing! Let’s look at the benefits:

  • creates fundamental value (so the service sector has something to leverage off)
  • creates jobs and then more indirect jobs than any other industry so it is great for employment
  • creates profits

And far from being in decline, the Australian Manufacturing PMI has been in growth most of the past  2 years so that is also really positive for the overall economy. Check out he graph below from the Australian Industry Group (AIG).

Australia Manufacturing PMI 2015-2017 shows growth the whole way

Australia Manufacturing PMI 2015-2017 shows growth the whole way

The above graph was created by Trading Economics. They provide a a useful way to use the AIG Australian Manufacturing PMI figures to get reports in the format you want. If you explore it more deeply, you can see that we took a hit to Australian Manufacturing during the Global Financial Crisis (GFC) but it has been an upward trend from then on.

AIG

AIG

Go Australian Manufacturing!

Successful Endeavours specialise in Electronics Design and Embedded Software Development, focusing on products that are intended to be Made In Australia. Ray Keefe has developed market leading electronics products in Australia for more than 30 years. This post is Copyright © 2017 Successful Endeavours Pty Ltd.

DSLR or Digital Single Lens Reflex Camera

Ignoring the play on words, the light camera is a major breakthrough in the use of multiple optical viewpoint cameras to create synthetic images that can be taken with something the size of a smart phone and rivals DSLR Camera photographs.

And spoiler alert, I’m getting one as soon as I can. Read on to find out why.

I enjoy photography and appreciate the balance between the size and convenience of my phone camera and the control and quality of image possible in my DSLR (Digital Single Lens Reflex) camera.

Lets look at how a DSLR camera works. This image is by en:User:Cburnett – Own work with Inkscape based on Image:Slr-cross-section.png, CC BY-SA 3.0, Link.

Single Lens Reflex Camera Cross Section

SLR Camera Cross Section

The photographer can see the subject before taking an image by the mirror. When taking an image the mirror will swing up and light will go to the sensor instead.

  1. Camera lens
  2. Reflex mirror
  3. Focal-plane shutter
  4. Image sensor
  5. Matte focusing screen
  6. Condenser lens
  7. Pentaprism/pentamirror
  8. Viewfinder eyepiece

For a Film SLR camera the sensor is the film. For the DSLR Camera the sensor is a digital image sensor CCD or Charge Coupled Device. These cameras use precision ground lenses and are capable of high levels of control and image quality. They also don’t fit in your pocket unless you have a very large one.

Below is a high quality rendering of a DLSR Camera provided by David McSweeney of Guru Camera. Much appreciated David. Click  on the picture to get a full size version.

DSLR Digital Camera Section

DSLR Digital Camera Section

The Light Camera

Light - a new camera concept

Light – a new camera concept

I am very grateful to Dr Rajiv Laroia who co-founded Light. Not only has he developed a breakthrough concept in portable digital photography, but he has been very open about how he went about it and how it works. This is an excellent example of the new Collaboration landscape we now work in. He took his idea to experts to validate it rather than hiding it and hoping no-one would steal it.

IEEE Spectrum have a very detailed article Inside the Development of Light which outlines the whole journey. There are several stand out points here:

  • he solved a problem he had – it represented a practical need he understood
  • he got expert advice early
  • it required a significant shift from the best of breed technology in place now
  • he knows his first version is just that
  • there is a long term product strategy in place
  • he is teaching the world how to do it so that he has first mover advantage rather than a monopoly

The last point is interesting for me. The days of monopolies are coming to an end. The days where a Brand could overcome deficiencies in an offering aren’t yet over but they are fading. Today you can source reviews from peers and industry forums and a Brand can’t as easily dominate a market just by reputation or marketing blurb. The products have to be as good as the Brand claims they are.

Dr Rajiv Laroia - cofounder of Light

Dr Rajiv Laroia – co-founder of Light

So back to Light. Dr Rajiv Laroia has started something we will all benefit from. The concept is brilliant and the results and funding are in place to make is commercially successful.

Will we see it in a smart phone soon?  I can see cut down versions of this concept being deployable in the very near future. The processing power is the challenge in a low power hand held device that is also doing cellular communications. So battery life versus quick availability of the finished pictures is the trade-off right now.

Is it doable in the long run? Absolutely!

Light in Action

Here are some videos covering the development journey, the first commercial version and the use of the camera.

 



Successful Endeavours specialise in Electronics Design and Embedded Software Development, focusing on products that are intended to be Made In Australia. Ray Keefe has developed market leading electronics products in Australia for more than 30 years. This post is Copyright © 2016 Successful Endeavours Pty Ltd.

Wearables started when?

The buzz technology of the past 18 months has been Wearables which is short for Wearable Technology. So when exactly did Wearable Technology begin? Like most overnight successes, it started a long time ago. Below is an infographic from http://www.visualcapitalist.com/the-history-of-wearable-technology/ that is an excellent overview of the topic, with some notable exceptions I will address after you peruse it. I selected it because it covers right up to this moment.

Wearable Tech History Infographic

Wearable Tech History Infographic

They got eyeglasses right but missed the other most successful wearable device of all time, the wristwatch. The first true wristwatch was made for the Queen of Naples in 1810 although arm watches date back to 1571. Neither were widely used because the mechanisms were prone to jamming and sensitive to ingress and so needed to be protected. So pocket watches and pendant watches dominated the scene. It wasn’t until the 1880s that artillery officers found it awkward to hold the watch and do their aiming and started strapping them to their wrists. This gave them visibility of the time when they needed without occupying one of their hands. The trend took off and by the early 1900s watch designs were modified to suit attachment to the wrist via a strap using lugs on the case. The age of the wristwatch was upon us.

So by this period, eye glasses if you needed them, and wristwatches or pocket watches, were widely adopted.

Wearable Computing Devices

So when were the first Wearable Computing devices? If you paid careful attention to the infographic, you might have noticed the Abacus Ring. Dated in the early 1600s this was definitely a computing device, just not an electronic one. It was a great aid to merchants of the day.

Abacus Ring - 1600s

Abacus Ring – 1600s

The first wearable electronics computing device to be widely sold was the Casio Calculator Watch which was released in the mid-1970s. Take up of portable music players and headsets were a bigger trend kicked off by the Sony Walkman at the end of that same decade.

It wasn’t until Bluetooth headsets emerged in the early 2000s that we had another mass adoption of Wearable Technology followed by the explosion of MP3 players and Apple’s massively successful iPod range.

Sports trackers start emerging from 2006 but it isn’t until Fitbit finally got their product into production that they really take off from 2009 onward. Fitbit almost didn’t make it commercially because the technology was really hard to make work and even harder to make. Today they have 70% of the activity tracker market but there are a plenty of new players now they have proven the market potential.

And wearable computers got a huge lift with the Google Glass project kicking off in 2012. It raised a plethora of issues, not the least of which was privacy. Although the product was discontinued by Google in January 2015, it took the debate on augmented reality and its issues forward.

Google Glass Tear Down

Google Glass Tear Down

The Year of the Wearable

Which brings us to 2014: declared the “Year of the Wearable”. Samsung’s Galaxy Gear wrist communications device from late 2013 had finally eclipsed Dick Tracey and the wrist communicator of the 1930s cartoon series. The explosion of product offerings has continued into 2015 with the much anticipated Apple Watch now released. And a whole new host of communications support accessories. Another growth area is pet management. As the technology gets more accessible to smaller companies we can expect this to continue covering the full range of possible options including:

  • Augmented reality
  • Medical monitoring and health support
  • Activity and lifestyle management
  • Pet management
  • Home automation
  • Communications and communications support
  • Computing devices of all types

There really isn’t an end to where this can go. It is up to companies to deliver real value to end users in order to define the bounds of what makes commercial sense. The technology is still hard to do but as more products get to market, more companies learn the techniques needed to be successful at super low power worn devices and the whole application area continues to progress.

Successful Endeavours specialise in Electronics Design and Embedded Software Development, focusing on products that are intended to be Made In Australia. Ray Keefe has developed market leading electronics products in Australia for more than 30 years. This post is Copyright © 2016 Successful Endeavours Pty Ltd.

We Won Best Networking Implementation

You might have read our post on being finalists at the PACE Zenith Awards 2016. Tonight we won the Best Networking Implementation award for 2016. Our Congratulations also go to IND Technology. Their Early Fault Detection product was the design we won this award for.

PACE Zenith Winners 2016

PACE Zenith Winners 2016

If you are wondering what the product does, it measures electromagnetic radiation from the electricity distribution grid using custom designed antennas, does DSP math on it, determines if a fault condition such as Partial Discharge is present, and sends an alert if it detects that. It does this at 250MSPS every second and uploads the summary results to a web service. Using PPS GPS synchronisation you can determine the distance to the fault from each EFD Device. Scatter a few of these around the network and you have the most cost effective Early Fault Detection system you can get. It is also a classic high bandwidth IoT project.

OK, enough engineer speak. Here is a summary from the night.

The MC was Merv Hughes who brought a lot of humour to the night through his novel pronunciation of technical terms.

The Keynote Address was given by Dr. David Nayagam who walked us through the The Bionic Eye project and the difference it was going to make to people experiencing blindness that didn;t have underlying receptor damage.

And we had an extraordinary interlude of entertainment by the Unusualist, Raymond Crowe.

PACE Zenith Awards 2015

PACE Zenith Awards 2016

2016 PACE Zenith Awards Winners

Here are all the winners by category:

  • Safety system innovation – Robotic Automation, for Multi-product Robotic Automation
  • Manufacturing Control – Sage Automation, for Integrated Process Control
  • Automation Innovation – Robotic Automation, for Multi-product Robotic Automation
  • Transport Control – Encroaching. For POW’R-LOCK
  • Mining and Minerals Process Control – Scott Automation & Robotics, for ROBOFUEL
  • Water and Wastewater Control – SMC, for Ethercat Network for Treatment of Wastewater
  • Machine Builder – Automation Innovation
  • Oil and Gas Innovation – Yokogawar Australia, Julimar Development Project
  • Power and Energy Management – Alliance Automation, Oxley Creek Rehabilitation Project
  • Best PLC. HMI and Sensor Product – Bestech Australia, Beanair Wireless Sensor Network
  • Best Network Implementation – Successful Endeavours, IND Technology Early Fault Detection System
  • Young Achiever of the Year – Kayla Saggers
  • Lifetime Achievement – Peter Maasepp
  • Project of the Year – Yokogawa, Julimar Development Project

Our congratulations go to all the participants.

Successful Endeavours specialise in Electronics Design and Embedded Software Development, focusing on products that are intended to be Made In Australia. Ray Keefe has developed market leading electronics products in Australia for more than 30 years. This post is Copyright © 2016 Successful Endeavours Pty Ltd.

Internet of Things

The Internet of Things, or IoT as it is abbreviated to, is still an emerging trend. But it is driving some substantial changes in some industry areas. This includes the 4th Industrial Revolution, also known as Industry 4.0.

If you are deploying to a factory or industrial complex, then generally the networking and power is already dealt with and you can piggy back off the existing infrastructure. But what about deploying Remote Telemetry? If you wanted to measure water tank levels or water usage in a rural location you might have to use a solar powered or primary battery powered system and 3G or 4G communications to get the data back to a website or server. That can have its own challenges. The typical industrial computer used for these monitoring tasks and posting reports or transactions requires a lot of power to run and is expensive. So can you do it if the budget for the hardware is $600, you don’t want to use solar cells and also don’t want to change the batteries every month?

The answer is YES. Check out this short video to find out how.

The awards referred to are covered in our recent posts on the National Manufacturing Week Endeavour Awards and the Process Automation and Control Electronics PACE Zenith Awards. The applicable categories are:

  • Water and Wastewater – IoT Monitoring Platform
  • Best Fieldbus Implementation – IoT Monitoring Platform
  • Power and Energy Management – IoT Monitoring Platform
  • Australian Industrial Product of the Year – IoT Monitoring Platform
  • IT Application of the Year – Telemetry Host IoT web platform
Endeavour Awards 2015 Finalists

Endeavour Awards 2015 Finalists

Successful Endeavours specialise in Electronics Design and Embedded Software Development. Ray Keefe has developed market leading electronics products in Australia for nearly 30 years. This post is Copyright © 2015 Successful Endeavours Pty Ltd.

PACE Zenith Awards

The PACE Zenith Awards 2015 celebrate the process control and automation industry’s many and diverse successes. The PACE Zenith Awards bring together some of the biggest names in Process Control, Instrumentation and Automation to celebrate, recognise and award companies and individuals for their key contribution to Australian industry. 

The awards winners were announced at the PACE Zenith Awards dinner at the Four Seasons Hotel Sydney on June 11th 2015.

This year we were finalists in 4 categories with the Power and Energy Management category having 2 projects selected as finalists.

Successful Endeavours Finalists PACE ZENITH 2015

Successful Endeavours Finalists PACE ZENITH 2015

The categories we were finalists in were:

  • Water and Wastewater – for our IoT Monitoring Platform + Telemetry Host
  • Best Fieldbus Implementation – for our IoT Monitoring PlatformTelemetry Host
  • Power and Energy Management – for our IoT Monitoring Platform  + Telemetry Host and the ABB CQ930
  • Transport Power and Infrastructure – for the ABB CQ930
PACE Zenith Awards - 5 Finalist Certificates - Successful Endeavours 2015

PACE Zenith Awards – 5 Finalist Certificates – Successful Endeavours 2015

 

PACE Zenith Awards 2015 Winners

So we didn’t win a category, but it was a great night and I always enjoy being part of celebrating what is good in Australian Manufacturing. The winners on the night were:

  • BEST FIELDBUS IMPLEMENTATION = Sigma NSW
  • FOOD AND BEVERAGE = B.-d.Farm Paris Creek
  • MACHINE BUILDER  = H.I.Fraser
  • MANUFACTURING = ANCA
  • MINING AND MINERALS PROCESSING = Sigma NSW
  • OIL AND GAS = H.I.Fraser
  • POWER AND ENERGY MANAGEMENT = Mescada
  • TRANSPORT, POWER AND INFRASTRUCTURE = Sage Automation
  • WATER AND WASTEWATER = Sage Automation
  • YOUNG ACHIEVER AWARD = Aaron Deal, Honeywell Process Solutions
  • PROJECT OF THE YEAR = H.I.Fraser

 

PACE Zenith Awards 2015

This was our first time at these awards so we learnt a lot about the process and hope to be back next year.

Successful Endeavours specialise in Electronics Design and Embedded Software Development. Ray Keefe has developed market leading electronics products in Australia for nearly 30 years. This post is Copyright © 2015 Successful Endeavours Pty Ltd.

Endeavour Awards 2015

This year we were finalists at the Endeavour Awards in the categories of Australian Industrial Product of the Year and IT Application of the Year. We didn’t win either category but the competition was pretty tough and I was pleased for ANCA for beat us for the Australian Industrial Product of the Year and also won the overall award for Manufacturer of the Year. The full list of winners are announced at the Endeavour Awards Winners 2015 official winners list.

Endeavour Awards Finalists 2015

Endeavour Awards Finalists 2015

It was a great night and a chance to share the evening with most of our team and a room full of people who are looking to be part of the solution rather than just contributing to the problem of being competitive in Australian Manufacturing. 

Endeavour Awards 2015 Australian Industrial Product Of The Year

Endeavour Awards 2015 Australian Industrial Product Of The Year

 

Endeavour Awards 2015 IT Application of the Year

Endeavour Awards 2015 IT Application of the Year

If you have been following us then you will also be aware we are finalists at the PACE Zenith Awards in Sydney on June 11th in 4 categories. Wish us luck.

Successful Endeavours specialise in Electronics Design and Embedded Software Development. Ray Keefe has developed market leading electronics products in Australia for nearly 30 years. This post is Copyright © 2015 Successful Endeavours Pty Ltd.

PACE Zenith Awards 2015

We have only just heard. You probably already know that we are finalists for the Endeavour Awards 2015 this year with 3 of our projects. Today we got the news that we are finalists in 4 categories at the PACE Zenith Awards for 2015. I’m sure at least one of you is wondering whether I spend all my time just applying for awards. The answer is no. I didn’t even apply for these. PACE saw the entries we put into the Endeavour Awards and decided they would also be good candidates for the PACE Zenith awards and asked me if it would be OK if they entered them for us. You can guess the answer I’m sure.

PACE Zenith Awards 2015

PACE Zenith Awards 2015

As a result, we are finalist in 4 categories for the 3 projects they nominated us for. The 4 categories are:

  • Water and Wastewater
  • Best Fieldbus Implementation
  • Power and Energy Management
  • Transport Power and Infrastructure

Both out IoT Platform (Internet of Things Platform) and Telemetry Host web hosted back end qualify for all of these, and the ABB CQ930 power factor correction controller and multi-bank or multi-stage capacitor controller supports the Power and Energy Management and also the Transport Power and Infrastructure categories.

The awards winners are announced at the PACE Zenith Awards dinner at the Four Seasons Hotel Sydney on June 11th 2015.

Wish us luck.

Successful Endeavours specialise in Electronics Design and Embedded Software Development. Ray Keefe has developed market leading electronics products in Australia for nearly 30 years. This post is Copyright © 2015 Successful Endeavours Pty Ltd

Schematic Capture

Schematic Capture is the process of defining the logic connections between different components in an Electronic Circuit. At the end of the process you have a diagram or Schematic of the circuit. That’s a complicated way of saying that it shows the connections between the selected components. We use Altium Designer as our EDA or Electronics Design Automation tool.

That is a lot of links but this is an important part of the process. Get this wrong, and you have a product that doesn’t work.

Electronics Schematic

Electronics Schematic

This the Electronic Circuit Schematic for a 5VDC Switch Mode Power Supply, also known as SMPS. It can deliver up to 0.5A and includes a number of novel features to reduce noise and ripple. The RC damper across D5 is one of these. The other is the 82R series resistor that limits the maximum current through the charge pump diode C14. The measured ripple is less than 1mVRMS.

I’ve gone into a bit of detail because this shows how effective Component Selection can lead to a great outcome. We started with the design objective of a non-isolated power supply to get a 5VDC rail for our circuit from the incoming 12VDC rail. I wanted an efficiency above 80%, low noise, small footprint and low cost. So we looked at a wide range of suppliers including some like Texas Instruments, or TI as they are usually referred to, who have tools on their websites that will select suitable components for you. In this case they didn’t have a suitable offering but Microchip did.

And the Schematic above is the result of the Component Selection process, review of the datasheet to get the circuit requirements for things like calculating the output voltage feedback divider (R10 and R12) correctly. And now we have our Schematic ready for creating the PCB Layout.

Altium

Altium – EDA

Altium have a comprehensive tutorial on the whole process using their tool at Get Started With PCB Design.

Successful Endeavours specialise in Electronics Design and Embedded Software Development. Ray Keefe has developed market leading electronics products in Australia for nearly 30 years. This post is Copyright © 2014 Successful Endeavours Pty Ltd

Next Page »