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Brad Albing

Get Up on the Fundamentals of Energy Management

Brad Albing
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fasmicro
fasmicro
12/12/2013 5:05:06 PM
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Re: The economics
@Victor, Europe is a big different from U.S. First, most of their leaders unanimously believe that climate change is caused by human activities. In America, more than 50% of the leaders do not believe that. So, the game here is drill baby drill. Europe shows leadership in its home by using policy to change habits and influencing what companies do. Exxom Mobil enjoys tax credits in US despite having the largest revenue in America

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fasmicro
fasmicro
12/12/2013 5:01:25 PM
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Re: The economics
Other than this current Smart Grid technology used by utility companies does not actually detect power theft or equipment failure.

Where I live in America, there is nothing smart about the grid. Personally, I am not overly worried because when an industry is regulated, I do not expect them to be agile. You cannot ask someone to invest in new technologies when he cannot increase price to recoup. Yet, it is bad to allow that company to be the only operating one.

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fasmicro
fasmicro
12/12/2013 4:59:26 PM
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Re: The economics
A lot of smart grid buzz these days is about the home.  

It is the weakest and the easiest link. It is another beast to work at the industrial scale, so we can do smart-grid at homes and feel very good when one company in a city can consumer up to 90% of the city power. In the old America when govt had deep purse, they would have stimulated this to the next level.

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B_Albing
B_Albing
12/3/2013 11:29:15 AM
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Re: Battery backup
@Victor - thanks for that info -- that's practically a blog in itself.

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Victor Lorenzo
Victor Lorenzo
12/3/2013 10:34:08 AM
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Re: Battery backup
Hi @Brad,

This page (http://www.st.com/web/en/home/catalog/mmc/FM76/CL1766/SC1412) lists some from STMicroelectronics. Security support is limited for these chips, once you crack the password all the security is compromised.

TI has one Dynamic NFC transponder, perhaps with too many pins, that can be 'repurposed'. It is intended for storing NDEF messages for dynamic NFC pairing.

Fujitsu is also entering the scene (http://www.fujitsu.com/downloads/MICRO/fme/ds-mb89r112.pdf), but it has almost no security at all.

For more complex systems Atmel has one (http://pdf.datasheetcatalog.com/datasheet/atmel/DOC1943.PDF) RFID-to-EEPROM interface chip.

In case you need one very secure system TI has one NFC reader/emulator chip (the TRF7970A) that can be combined with one ultra-low power MCU (with some hardware hacks/tricks both can be powered from the RF field and/or with local supply) to emulate ISO14443-A/B tags (all the cryptographic work must be done in the local CPU). Is is fairly easy to implement type-B emulation with this chip, but type-A emulation requires more skills and a more powerfull CPU (forget about the AVR/MSP430 and alike) in order to comply with ISO14443A timing specifications.

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B_Albing
B_Albing
12/3/2013 9:29:48 AM
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Re: Battery backup
@Victor - did not know about that type of dual port memory. Thanks.

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B_Albing
B_Albing
12/3/2013 9:28:02 AM
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Re: Battery backup
@Victor - yes, ou're right -- most engineers know to add a battery for powering the equipment during power-down times. Initially, it seems counter-intuitive to add a battery to a power meter. Like you said, if the power goes off, there's nothing to measure; any other time, you have the power you need available for your circuitry. But with the RF link, the power companies can get very accurate info on where power disruptions occur.

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Victor Lorenzo
Victor Lorenzo
12/3/2013 5:55:30 AM
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Re: Grid Instability
@Daej, "A generator that drops a certain frequency below 60 Hz would eventually generate heat of bearings and in consequence, drop the voltage in the transmission line of electric, as power supply instability such as phase and voltage fluctuations"

Small frequency variations around the 50/60Hz are allowed by regulations and should be taken care of by designers (electronics and mechanical).

In the case of monophasic AC motors the rotating magnetic field vector does not describe a circle, but an ellipse, and that in fact conducts to bearing stress by vibrations, but that would be crytical only in case of having one operating point too close to the mechanical resonance frequency of the motor.

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Victor Lorenzo
Victor Lorenzo
12/3/2013 5:25:34 AM
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Re: The economics
@goafrit2, "Energy is becoming cheaper in America and that is bad business for the smart grid sector!"

In Europe it's more or less moving in the opposite direction. Some CEE projects have been funded focused on what is been called 'smart city'.

Smart grids are mentioned in this excerpt from the European Initiative on Smart Cities http://setis.ec.europa.eu/set-plan-implementation/technology-roadmaps/european-initiative-smart-cities as part of the Energy Networks point.

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Victor Lorenzo
Victor Lorenzo
12/3/2013 4:44:15 AM
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Re: Battery backup
@B_Albing, in case of long term power loss, some RFID products manufacturers are now providing kind of FLASH memories with dual interface, one SPI/I2C for reding/writing from MCU side and one RFID (ISO14443/ISO15693/NFC) for local wireless reading/writing with one RFID reader (no need to remove any SD or similar memory).

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Page 1 / 6   >   >>
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