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Most of my designs were done with off the shelf cmos components to monitor storage cell conditions and control of trickle charging.

Iron

Oil well control and monitoring equipment with radio links.

Iron

Projects have used monocrystilline cells to power remote equipment.

Iron

hello all from Edmonton, Alberta

Iron

i think, still i have a time to attend for the next lesson in conjuntion with the course...thanks sir paul...

EXCELLENT! i have learned a lot eventhough those are not detail but it reminisched my university day...regards and thanks to DIGI-KEY and DESIGN NEWS...

another GREAT PRESENTATION again sir paul...i am enjoying with the lesson...much appreciated!

i am now on slide 18 with the topic...

i am now on slide 2 to begin the lecture...

i am now downloading the slides for this event...

here i am again for the next topic of energy harvesting...

you know, this is the good thing for archived because there's a continuation after the first lesson to the next lesson until you obtain/complete the whole topic whom our lecturer, sir paul, want to emphasize...

graet sir paul & good evening once again and to all colleagues for this session...

Very informative lecture

Iron

Great to have access to the recorded sessions.

Iron

Missed the live lecture

Iron

Taking the class offline.

Iron

Very late in getting to this but really enjoyed it. Will try to get to the later classes.

Platinum

Hello from Sunnty Mazatlan, Mexico -- just catching up.

Iron

thank you. was amaizing going thru these slides. AND THANK YOU SO MUCH!!!! you are a LIFE SAVOR for introducing PROPETUUM TO US!! GOD BLESS YOU!

Iron

No high efficiency cell use

Small solar power cell with battery to run a LED light

God Bless Boston
God Bless the USA
United We Stand...

Iron

OK everyone, going to sign off, thanks for listening

and see you tomorrow.

Blogger

yes, good info - thanks

Iron

This subject is certainly more fascinating than I would have imagined.

Thanks, Paul

Very informative :)

Iron

Thanks Paul!  Until tomorrow.

Iron

Super caps have low internal resistance which goes up as the

device ages.  This is one failure mechanism.  In general it is

important to look at the difference between battery and super

cap failure mechanisms when you make your selection.

Blogger

I am pretty jazzed by supercapacitors today.  Batteries suffer from

chemical action - today's super caps don't work that way, they are

charge-field devices and can run a very high number of cycles.  Even

with high burst currents.  We'll talk about these on Thurs.  We at Orchid

are seriously looking at these as replacement for batteries in some

applications.  Take a look at the Thursday slide deck...

 

Blogger

Apart from fast discharge, don't capacitors have near-zero internal resistance too?

Iron

Is it better to use a supercapacitor instead of a battery in some applications for the energy storage? Say if one needs high pulsed powed to do a burst transmission?

Charging from multiple sources will add cost, size, weight.  These

are first factors to consider.  However, if its needed.... then its needed

and one should proceed accordingly.  Issues would be to be careful

not to waste energy in leakage current through power sources that are

not on or being used at the moment.  Remember, best fet switches leak

at least a few uA.

Blogger

Great presentation thank you Paul

Iron

Isn't steinbibler the energy harvesting from excessive

and often wasted jaw movement??  I might be a good

candidate.    Do you mean steebler?.... don't know.

Blogger

How much more effort, i.e. overhead, has to be spent for the charging circuit when using multiple source? Thanks.

Iron

Good question:  Yes one can use multiple energy sources for

harvesting.   Clearly, in certain applications such a scheme would

be necessary. 

Blogger

@Flux_Capacitor - I'm not too sure but I think you are in it.  At least, Mr. Nickelsberg answered questions here yesterday after the presentation.

Iron

Thanks for the insight!

Iron

Does anyone know how to get to the live chat?

Looks like Digi-Key (as usual) carries a lot of related parts, supplies, DEV Kits and etc. with the data sheets usually being available from their site ...

 

Good presentation and intro Paul ... til next time ...

Radiated power: we'd like to see about 1 to 10mW.

We would store over time and use over a short duration.

New super caps - more on those on Thursday - make this

really doable.

Blogger

@RMenon - thank you for the guidance.  I was surprised at the power output and certainly within my requirements.  I am off to the Powercast web site.  Cheers.

Iron

Great presentation thanks Paul.

Have you heard of the Stienbibler effect?  Sorry about spelling not sure

Iron

Is it feasible to use more than one form of energy harvesting to charge a single system battery? How doees one interface the charger outpots?

Joule Thieves.... that's great.

Blogger

What load current/power range one could get from the radiated inductive method?

Iron

Cell manufacturers provide alot of spec's, you should

try them as well though - especially when one part is

shaded and another part is illuminated.

Blogger

@FrodoH - RF transmitters are allowed in petrochemical plants, so long as they are intrisically safe and have Factory Mutual or BASEEFA certification.  I used to sell Honcho Rf communications to offshore platforms couple of decades ago.

Iron

Thanks again Paul - and thanks for introducing specific device part numbers!

Iron

Regards inductive technologies, proximity is very imporant

for efficiency.

Blogger

Paul, do you know what type of energy harvesting is used for remote tire pressure sensors?

Radiated is really interesting and we are now

seriously looking at it for an unteathered sensor

application of our own!!

Blogger

Another excellent lecture, Paul! Thank you!

Iron

Thank you very much

 

Good stuff! Thanks, Paul!

Iron

Our hats off to the brave people of Boston.

Platinum

Using 7.5 khz induction heater

 

Iron

No, at least not yet

Iron

Unable to use transmitters - probably not allowable in petrochemical plants

Iron

no not at the moment.

Iron

Not using radiated at this time, but it's intriguing.

Iron

no, but it is very interesting.

Iron

Today's next audience question is
Is anyone listening using low frequency energy transfer devices?

Blogger

Using High Efficency solar cells with micro-inverters for renewable energy for residential and commercial use. 

Iron

How efficient are the current inductive technologies?

Iron

Of course, the production was too expensive to go into mass production :)

Iron

slide 17 is the crystal radio I built as a kid.

Iron

No not using conversion now but hope to soon.

Iron

No, but I know some people who have been working on solar cells with ~30-35% efficency. They were using a pyramid structure on the surface and thus could use the incoming light twice (reflected towards other pyramids)

Iron

We are using bi-directional inverters for our energy storage systems

Iron

no, no, just auditing the technology

 

Iron

The 120 Hz sweet spot on slide 16 is intesting since that is the frequency from 60 Hz motors such as air conditioners.

Iron

No current (har) applications with solar but investigating.  Quite interested in higher performance.

Iron

Today's next audience question is
Is anyone listening using power conversion modules?

Blogger

Interested in wireless charge.

Iron

Not currently using solar or power conversion modules.

Iron

Today's next audience question is
Is anyone listening using high efficiency solar cells?

Blogger

G24 is no longer in business??

Iron

G24 closed its doors in Wales about a month ago.  Needs a buyer.

Iron

I don't see three (red?) lines on the graph. Is it just me?

Iron

@ vsrollins

I agree  ;)

CIS thin-film solar panels are also a good alternative to crystalline solar panels in high temperature and low light level areas.

 

Iron

pictures help quite a bit but the comparison of the effectiveness is most interesting

Iron

Today's next audience question is
If it was unclear to you in the last question, does seeing these solar cell pictures help you to identify the type of cell you are using?

Blogger

Do manufacturers of cells provide the parameters for the equivalent circuit?

Iron

Sorry...that should have been 2200 Ah lithium-ion battery pack.

Iron

Hello, from Port Saint Lucie, FL

Iron

Yes, using solar cells.  My first post didn't come through...

Iron

Using 10W/12V Solar panels to charge a 7.4V 22Ah Lithium-ion battery pack for my most recent project. Still in prototype.

Iron

Solar under consideration.

Iron

@eclmex - Welcome.  My wife was born in Cuidad Chih

Iron

Not using solar cells at this time

Iron

Good afternoon from chilly and raint Toronto

Iron

Today's first audience question is
Is anyone listening using solar cells now?  If so what type and power levels?

Blogger

Hello from Mexico, Chihuahua

 

Iron

Hello from Milwaukee!

Iron

Straining at a gnat, swallowing a camel??

Home electronics accounted for 82 billion kWh of U.S. household electricity use in 2001. Color TVs, found in 106 million households, accounted for 33 billion kWh and were the largest single home electronics use. TV peripherals (VCRs/DVDs, cable boxes, and satellite dishes) accounted for an additional 16 billion kWh.

U.S. HOUSEHOLD ELECTRICITY REPORT

http://www.eia.gov/emeu/reps/enduse/er01_us.html

See also: http://en.wikipedia.org/wiki/Energy_in_the_United_States

Hi all - Audio is live!

Good Day from Chicago

Hello from Atlanta.

 

Iron
Hello from florida and thanks for sharing your information. Circuitman
Iron

Hello from Albuquerque.

Iron

incorrect, download slides and study up.

then start the audio top of the hour

Iron

@AndyK, You also have to click the Play button on audio when it appears under the Classroom header

Platinum

@AndyK, you have to download the slides.  Click on Today's slideDeck

Platinum

Hello from Montana

Platinum

Good morning from California. Slides are going to magically pop up and audio start in 7 minutes, correct?

 

Iron

.pptx is a newer format.  If you can not open them with your PowerPoint, there is a translator from Microsoft on their site.

Iron

Good Morning from Valdez. Snowing again.

The Day 2 slides are stored as PPTX files. The other days (3-5) are in PPT format (suffix name). That may be why some readers are having trouble. I don't know the diff from PPT to PPTX. I opened them both with OpenOffice .

I don't apear to be online?

Iron

Different PC with PowerPoint installed works ok.  So I guess I'll sit here for the duration.  Thanks to everybody for their help!

Iron

I just downloaded the slides again, and have no problem opening them with powerpoint 2003

Iron

Same results with IE8 as Firefox 20.0.1, specifically: Powerpoint cannot open the file.

Iron

I use Chrome and never have a problem

 

Iron

Good morning all from CA, thoughts and prayers to those in BOSTON

Iron

@dave3000:

I am using Power Point 2007 and Firefox as my brower and the slides are fine

Iron
@davec3000: Have you tried downloading via a different browser?

 

Greetings.  I have been unable to view the slides.  Downloaded 3 times.  I am using MS PowerPoint Viewer 2007.  Yesterday's slides were, and still are, ok.

Iron

I have never seen such a generous Starbucks prize.

I cant help but wonder if it is a typo.

Iron

Greetings from Raleigh, NC

Iron

Hello all; I was able to download the slides. It looks good

Iron

I have been very interested in the field of energy harvesting for wireless devices.

What media will be used for this event?

Iron

Hello from Binghamton, NY

Iron

Re-download got it working correctly.

Ann & Paul,

Slides download with errors. Slide footers and ehaders are undisplayable. Slide 5 is a blank title slide.
Trying re-download but not looking good.

Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using the hashtag #CEC.

Blogger

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.

Blogger

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

Hello from cloudy Minneapolis.  It's going to be 44 degF here today.  They say spring is on the way, but...

Iron

i just logged in from Ottawa, ON, for the 2nd day of this lecture series.

Iron

Good Morning from Sunny PC FL

Iron

Morning! 15hrs 22mins daylight

Iron

Good morning from Nebraska!

Iron

Good morning from Scottsdale

 

Iron

Good morning from Mobile, AL

The law of conservation of energy, first formulated in the nineteenth century, is a law of physics. It states that the total amount of energy in an isolated system remains constant over time.

 

A consequence of the law of conservation of energy is that no intended "perpetual motion machine" can perpetually deliver energy to its surroundings ...

 

http://en.wikipedia.org/wiki/Conservation_of_energy

 

Planck, M. (1923/1927). Treatise on Thermodynamics, third English edition translated by A. Ogg from the seventh German edition, Longmans, Green & Co., London, page 40.

Good morning from Brick, NJ

Iron

Good morning from Portland Oregon

Iron

hello from texas

 

Iron

Good Morning from GA

Iron

Morning, Thanks for the numbered slides today.

Iron

Good Morning from Boston; slides1-24 are up.Thanks.

Iron

Good morning, everyone

Iron

got the new slides, look good, thanks

 

Iron

Update: The new slide deck has been posted.

Hi all - A new slide deck with numbered slides will be posted shortly. Same thing for Day 1.

Hello otherwise

 

Iron

Unable to download slides broken Link!  404.0 error

Iron

Day 2 slides are un-numbered.

Studying them in advance helps my keep up.

I need numbered slides please.

Iron

Day 2, good, day 1, no good slides.?

Iron

Day 1 slides fail to download (see my comment over there on the server error message) but day 2 slides download fine.

Sorry Paul, signed up but had to go to Maracaibo for the week and will have to do it via archive when I return.

Iron


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