Tag Archives: Energy Harvesting

Electronics Design for Green Manufacture?

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Electronics Design for Green Manufacture

This is not as straight forward a topic as it might at first seem to be. And this is because there isn’t yet a unified agreement on exactly what Green Manufacture means. And like most Design Issues, you cannot do Electronics Design without clear requirements. So what are the requirements?

 

Here are some Green Manufacture requirements or targets:

  • reduce product Power Consumption
  • reduce manufacturing Power Consumption
  • add Renewable Energy options to the product
  • add Renewable Energy options to the manufacture process
  • reduce pollution or waste in the manufacture process
  • reduce energy involved in upstream or downstream processes
  • reduce pollution or waste in the upstream or downstream processes
  • increase product life
  • increase product utility
  • increase manufacturing plant utilisation

I guess you can see the dilemma. It can be hard to know which target to aim for. Am I doing the Electronics Design with the product, process, life cycle or ecosystem issues as the primary concern? And how do I balance these concerns.

 

Electronics Design can be Green

One major thing we can do is reduce the product Power Consumption. We are coming out of a phase where a mains plug pack power supply was considered an ideal way to avoid compliance costs when designing new products. This has led to a proliferation of low efficiency always on powered devices. A recent look under my desk reveals the problem we have as Product Developers where every device I use is either USB Powered or mains plug pack powered.

 

So a first step is to review this whole approach to supplying power to devices. We have made steady gains in the area of Power Consumption reduction for the devices themselves. Now it is time to do a similar thing on the Power Supply side.

 

Energy Harvesting

This is a new area that hasn’t yet reached mainstream development. The idea is that you can utilise the ambient environment to get power for free. Or at least you aren’t directly requiring extra Power Generation. Hence the name, Energy Harvesting.

 

How you do it and the Electronics Design and Electronics Technology required to make it work are still being defined but there has been some interesting new progress. Some key players are:

 

Linear Technology

 

Enocean

 

What is Energy Harvesting?

This is where we use Electronics Design and Electronics Devices to generate power from the Ambient Environment. The result is a product that doesn’t need to be plugged in and recharges itself automatically. Some of the Energy Sources that are used are:

  • Light
  • Thermal differentials
  • Vibration
  • Chemistry
  • Pressure differentials
  • Air Flow

One example of a product that does this is the Enocean Light Switch where you can just put it where you want it. And if you change your mind, just move it. Now wiring required.

 

Right now the technology is still more expensive and so take up is slow. But as it develops and the price comes down that will change.

 

We are in for some interesting times.

 

Ray Keefe has been developing high quality and market leading electronics products in Australia for nearly 30 years. For more information go to his LinkedIn profile. This post is Copyright Successful Endeavours Pty Ltd.

Green Electronics Strategies – Reducing Power Consumption

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What is so good about Low Power Electronics?

 

If you read my last post, you would have noticed that this has the potential to reduce overall Power Requirements. Up until now, only Battery Operated Devices have really cared about Power Consumption. If you could plug it into a wall outlet then all was OK unless you were consuming more power than a standard circuit allowed.

 

Today, things are different. Climate Change is a global concern and reducing the Carbon Footprint for a product is important, regardless of what sort of power it consumes.

 

If we can reduce the Power Consumption of an appliance by 50%, then provided its Electronics Manufacture does not add that back again, we have a net Carbon Footprint gain. In fact, if we can do this across all products then we will meet our Global Carbon Reduction target of 50% by 2050 with this strategy alone.

 

 

How to reduce Electronics Power Consumption

This is not a new topic, and much of what I present here represents the combined experience of the Electronics and Embedded Software industry. Here is the short list:

  • reduce the Supply Voltage for Microcontrollers, Microprocessors and CMOS Circuits in general
  • use Sleep Modes and keep the Wake Periods as short as possible
  • replace High Power Consumption Devices with Low Power Consumption Devices
  • replace high utilisation Digital Filters with Analogue Electronics equivalents
  • replace Polled Operating Modes with Event Driven Operating Modes
  • use Low Power Smart Peripherals that Wake the rest of the System only when required
  • reduce the Time To Wake and the Time To Sleep
  • optimise the Software Execution Flow
  • use Energy Harvesting
  • Remove power from sections of Electronics Circuitry when not in use

There is overlap and interdependency between these but that is a good starting point.

 

Next I will start look at specific examples.

 

Ray Keefe has been developing high quality and market leading electronics products in Australia for nearly 30 years. For more information go to his LinkedIn profile. This post is Copyright © Successful Endeavours Pty Ltd.