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Andy

Sat Feb 07 2015, 07:20PM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874

I got some boards made and plan to use them to automaticly adjust frequency duty cycle and voltage level through a inductor to achieve the input ouput desired.

A couple of things, do theres board look like they will work, the top left is a linear voltage reg, the thing to its right is the program interface.

What other things can produce more ouput from a inductor apart from the three above, im after slightly bais voltage or current so that over time the magnetic feild is more dc type with fluctuation.

This might be over kill, what else with this board can I use for this inductor experiment.

Carbon_Rod

Sun Feb 08 2015, 09:59AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
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Posts: 1155

No...
If top layer shows pin 1 correct, and the chip is on the bottom layer.

The pin layout will be mirrored...

Also, I am unclear exactly what you are trying to articulate regarding resonant circuitry, and or saturation.

Andy

Mon Feb 09 2015, 03:35AM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874

Im looking into temporary energy storage for wind and solar panels to see if its worth the while to devolpe it.
Im trying to control the caps and inductor discharge characteristics with a picmicro.

Those boards are a waste as for a tenth can get the pic and the board allready soldered, but im after information to test and adjust the charisctics of the ouput.

Say a sudden load is connected, the ac with dc in series, is changed so the frewuncy increase for more volts or switchs to discharging a capactor, or a network switchs is throwing to change the ouput.

Im trying to workout what to program and why, say a fixed frequency and current to test with voltage the energy left in the inductor.

Thanks

Carbon_Rod

Mon Feb 09 2015, 09:20AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
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Posts: 1155

Resource management is more than simple conversion efficiency under specific conditions.

Most use a big DC-to-DC converter that provides a constant voltage and a variable current supply.
These are 80% to 94% efficient under normal operating conditions. Since energy input varies, the tuned circuit would only slightly improve available power under another specific weather condition. Note, that the majority of the useful power is converted when its generated at high output levels (often >90% efficient when >75% generation power output.)

For example, a solar power system known to degrade 40% in 15 years must already provide excess capacity. Some people are frugal, so even putting battery aging characteristics aside we would see the user end up below their power requirements in under a 2 year service life. Accordingly, it is usually wise to install 3 times the average watt/hr draw for the installation. Likewise, wind power systems use a massive power resister to dump the excess capacity once the battery bank is charged.

Planned correctly, service life redundancy should overlap initial demands, and provide excess power allocation larger than any efficiency losses at the low output end.

Cheers,
Rod

Patrick

Mon Feb 09 2015, 09:27AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Carbon_Rod wrote ...

For example, a solar power system known to degrade 40% in 15 years must already provide excess capacity. Some people are frugal, so even putting battery aging characteristics aside we would see the user end up below their power requirements in under a 2 year service life. Accordingly, it is usually wise to install 3 times the average watt/hr draw for the installation.

Holy S***! Do you mean the silicon cell degrades over time?

Carbon_Rod

Mon Feb 09 2015, 10:31AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
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Posts: 1155

@Patrick
Various types have different aging profiles, and even the high-end films used in satellites have a similar characteristic (~15% loss at best).
The hotter they run the faster it happens.

Every system needs maintenance eventually, and wind turbines also need more care than most would guess.

Primate brains don't naturally operate on the following algorithm:
Actual-Cost = (Initial-Cost / Use-Count ) + (Maintenance-Cost * Projected-Incidence-Count )
note as Use-Count â†’ 0, it states you can't afford to own the item in question.

Ash Small

Mon Feb 09 2015, 02:17PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

Once all your batteries are fully charged, What do you do with the extra power?

1, Pump water uphill, so it can be used to drive a turbine later?.......you need a resevoir.

2, Electrolysis of water to produce hydrogen that can be burned later?......involves compressing it for storage, etc.

3, Use it for some 'profitable' electro-chemical process that earns you money?......the opportunities are almost limitless.

(or you could just use it to power a Tesla coil)

Carbon_Rod

Tue Feb 10 2015, 01:07AM

Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155

@Ash Small

Most attempt to sell energy back to the grid to supplement maintenance costs.

Andy

Tue Feb 10 2015, 05:15AM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

Im trying to solve the problem of battery costs for renewables, as a 1MW wind turbine isnt going to have car batterys, and a house that averages 2kwh still uses ten or so batterys replaced every two years,.

Priced a inductor which should beable to handle 100amp on 100 turns for about 150 per ten meters, but I have to design for max amps, and a sudden lost of generatored power, which would destroyer the thing.

How would I go about making a 100 amp slowly drop in current from a cap or maybe a battery for 1,10,100H inductor, and keep the voltage below 5 kv.

is the think ill be experimenting with, mainly because of the pin count, which should give some flexabilty with driven more siwtchs and io

Will be driving the inductor with this, but will have traics to change postive and negtive peak, and or drop the voltage of both.

Dr. Slack

Tue Feb 10 2015, 08:30AM

Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659

I think worrying about what microcontroller or otherwise to use to control a storage medium, when the storage medium itself is flawed - have you worked out the L/R time constant for copper for a few practical example geometries - is rather like a girl, when contemplating whether to spend the rest of her life with a particular man, getting stressed over whether a dress is this or that shape. Um, no, wait ...

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