inductive power supply

[Stefanoo]

This is a nice section.
It's the first time that i write in here.

i would need support.

Does anyone know about inductive power supply?
Can anyone give me some titles of book or usefull link at the forum or on the net abuot this subject?


Thanks in advance.


Best regards,
Stefano.

[FastEddy]

Consider those rechargable powered toothbrushes ... you know, the ones that you just place in the holder to recharge ...

Torrid coil around the outside, usually at full house power ... and a torrid pickup coil with an iron core insider the toothbrush with a simple regulator to charge the battery ...

Is this what you mean?

[Dick West]

Stefanoo,

There are many posts in several threads here about the use of an inductor in a power supply. Check out stuff about a CLC power supply configuration. Inductors are storage devices and do help smooth out ripple, but they work best for class A amplifiers. Check out the Son of Zen amp's power supply (Nelson Pass).

Hope this helps.....

[Stefanoo]

Thank you guys for all your answers.

The inducive power supply or contaact less power supply, is a particular power supply that uses inductor as storage not allowing the contact between the load and the power stage (is it correct?).

Why should it be usefull just for the Class A?

Anyway i will search on the forum the subject that you've just indicated me.

I don't now if anyone knows, but is there any good textbook that takes deeply in consideration this subject?
If yes, could anyone highlights a title for me?

Thanks.
Stefano.

[MRupp]

is a particular power supply that uses inductor as storage not allowing the contact between the load and the power stage

I am not sure I understand you correctly but you possibly mean a "choke input" or LC power supply, where the indictor actually stores energy so that you achieve power factor correction and a continuous current draw of the power supply. There should be some information on this forum, there is also the HB214 application note from On-Semi called "Rectifier Application Handbook" that has a section on choke input filters.

[FastEddy]

Yes coils (inductors) can store energy just like a capacitor.

However, generally, to get as much storage "value" out of an inductor as a capacitor takes a whooping huge inductor ....

By carefully matching an inductor and capacitor it is possible to have better, cleaner results than a simple capacitor in the power supply circuit by itself.

The way it was explained to me is that the "phasing" of an inductor compared to a capacitor is the key ... the "filling" of cap with electrons "lagging", the "filling" of an inductor "leading" ... thus bringing the phase shift back toward the "middle" ... ...

But it does work and it does take the noise off of the line and filter better than caps alone ...

I refer the gentleman to the work of Maxwell and Tesla for further specifics.

[Stefanoo]

Originally posted by FastEddy
Yes coils (inductors) can store energy just like a capacitor.

However, generally, to get as much storage "value" out of an inductor as a capacitor takes a whooping huge inductor ....

By carefully matching an inductor and capacitor it is possible to have better, cleaner results than a simple capacitor in the power supply circuit by itself.

The way it was explained to me is that the "phasing" of an inductor compared to a capacitor is the key ... the "filling" of cap with electrons "lagging", the "filling" of an inductor "leading" ... thus bringing the phase shift back toward the "middle" ... ...

But it does work and it does take the noise off of the line and filter better than caps alone ...

I refer the gentleman to the work of Maxwell and Tesla for further specifics.

it is exactly wht i was searching.
Do you have any referring to some textbooks that talk about this subjext?
i have been searching it for long time but without results.
if possible,Could you suggest me something?

Best regards,
Stefano

[FastEddy]

First understand how inductors compare to resistors & capacitors:

http://en.wikipedia.org/wiki/Inductor
http://en.wikipedia.org/wiki/Capacitor
http://en.wikipedia.org/wiki/Resistor
http://en.wikipedia.org/wiki/RLC_circuit

You might consider just exploring these online references. Start in the middle of these web pages and read down from there ... the math in the first half og these articles is virtually useless until you see where its going ... :>)

A lot of what I have learned has come from doing, not teaching. There really is no substitute for breadboarding stuff together and watching the 'scope.

There is a very valuable resource that I always recommend for those wanting practical knowledge in usage of electronic components ... this reference includes both very simple and practical applications and information as well as theoritical references:

The Amateur Radio Relay League ( http://www.arrl.org/news/images/iarulogo-new.jpg ... http://www.arrl.org/catalog/ ) ...
ARRL Handbooks: http://www.arrl.org/catalog/9485/ ...

Personally I prefer the older editions from the 1960's as they don't clutter up the analog information with a lot of the digital = more extensive projects in the analog audio realm ... located in many good libraries.

(I learned about the scientific details in college classrooms (Physics, Math, plus Aeronautical and Mechanical Engineering) so my resources might be difficult to follow = heavy on the theory and math ...)

Truth is one, paths are many ....

[FastEddy]

" ... Hydraulic model
Electrical current can be modeled by the hydraulic analogy. The inductor can be modeled by the flywheel effect of a turbine rotated by the flow. As can be demonstrated intuitively and mathematically, this mimics the behavior of an electrical inductor; current is the integral of voltage and in cases of a sudden interruption of flow the turbine will generate a high pressure across the blockage, etc. Magnetic interactions such as transformers are not usefully modelled. ..."

This is not really a very good explaination of the "Hydraulic model" ... and in the case of Inductors and coils there is no "real" inductor analogy in hydraulics.

The "Hydraulic model" for capacitors does, however, work very well = capacitor = a bucket that gets filled with electrons (over time) = an accumulator. Same with resistors = a restriction or orifice.

.....

The math and theory derived from the observation of inductors gets really tricky, especially the calculus ... as the use of imaginary numbers is extensive and often mysterious. Recent theories using a ten diminsional model of the universe come a lot closer to the truth about inductors as Maxwell's equations (in four diminsions) seem to imply time travel = the inductor seems to respond before the signal is imposed on it = "leading" rather than "lagging" the flow of electrons or signals !! !!

[Stefanoo]

Originally posted by FastEddy
First understand how inductors compare to resistors & capacitors:

http://en.wikipedia.org/wiki/Inductor
http://en.wikipedia.org/wiki/Capacitor
http://en.wikipedia.org/wiki/Resistor
http://en.wikipedia.org/wiki/RLC_circuit

You might consider just exploring these online references. Start in the middle of these web pages and read down from there ... the math in the first half og these articles is virtually useless until you see where its going ... :>)

A lot of what I have learned has come from doing, not teaching. There really is no substitute for breadboarding stuff together and watching the 'scope.

There is a very valuable resource that I always recommend for those wanting practical knowledge in usage of electronic components ... this reference includes both very simple and practical applications and information as well as theoritical references:

The Amateur Radio Relay League ( http://www.arrl.org/news/images/iarulogo-new.jpg ... http://www.arrl.org/catalog/ ) ...
ARRL Handbooks: http://www.arrl.org/catalog/9485/ ...

Personally I prefer the older editions from the 1960's as they don't clutter up the analog information with a lot of the digital = more extensive projects in the analog audio realm ... located in many good libraries.

(I learned about the scientific details in college classrooms (Physics, Math, plus Aeronautical and Mechanical Engineering) so my resources might be difficult to follow = heavy on the theory and math ...)

Truth is one, paths are many ....

thank.

The last 3 links that you quoted on the post, redirected me to a website where i have to buy stuff.i don't know!
Maybe you put the wrong addresses, or i don't find the right section.

i'm still looking for some references on this subject.
I'm sure there should be someone that considered it and wrote some documentations.
Hopefully!

Nice example with the turbine.
Honestly, i understood it, but not totally.

i'm looking forward to receiving other suggestions from you guys.


Regards,
Stefano.