[NewCandle] Energy Harvesting

[Nick Reiter]

Hi all,

Horace beat me to it.  Variable capacitance generator.
 Or big wave driven squishy caps...

See thus:

http://www.theavalonfoundation.org/docs/capshift.html

http://www.theavalonfoundation.org/docs/varicap.html

N

--- Horace Heffner <hheffner at mtaonline.net> wrote:

> 
> On Oct 22, 2008, at 4:26 PM, Keith Nagel wrote:
> >
> > So what else can we use? Yea olde magnetic pickup.
> I'm imagining
> > something like a speaker cone arrangement.
> 
> How about a plain old variable gap capacitor?
> 
> If you use mechanical energy to pull apart two
> plates having a charge  
> then work is done and the voltage necessarily rises.
> You can now  
> discharge the plates through a circuit to obtain the
> electrical  
> energy. All you need in addition is a trickle charge
> to maintain the  
> average charge on the plates and full wave
> rectification.
> 
>       D1                   V1
> P---|>|---R1--o-------C2--o---B1--------Load
> |             |               |           |
> G     Mech.==>C1              G           G
>                |
>                G
> 
>    Fig 1 - Diagram of mechanically driven capacitor
> gap power supply
> 
> In Fig. 1 a HV DC power supply P and D1 maintains a
> high voltage by  
> trickle charge through on the plates of a variable
> gap capacitor C1,  
> the gap of which is varied by mechanical power.  The
> AC power from  
> generated by the mechanically driven gap
> oscillations of C1 are  
> transmitted through the DC current blocking
> capacitor C2 and a  
> rectifying bridge B1 to the load.
> 
> One advantage to this design is the RMS voltage V1
> is only limited by  
> the gap breakdown voltage, thus the advantage is
> avoiding in many  
> cases problems obtaining sufficient voltage to
> effectively drive a  
> bridge rectifier B1.  If a sufficient voltage V1 is
> difficult to  
> obtain, it is still possible to drive a FET bridge
> B1 (and diode D1  
> if necessary) using plate position sensing or
> potential sensing  
> circuitry to drive the gates provided the energy
> required is not  
> excessive.
> 
> An alternative to power supply P plus D1 is to
> eliminate them and  
> make at least one plate of the capacitor C1 a
> charged electret.
> 
> Best regards,
> 
> Horace Heffner
> http://www.mtaonline.net/~hheffner/
> 
> 
> 
> 
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> 


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