80W power source

premkumar9 · Dec 5, 2008

Ubergeek63 said:
I see now...I had missed that point. But then the 9V battery is not supplying the 80W, the capacitor is.

The same formula applies:

https://www.electro-tech-online.com/custompdfs/2008/12/PIC_T-UP_SERIES_DNE-1.pdf

0.1F, 15mΩ, 9V yields a peak power of 1350W into a 15mΩ resistor.

Capacitor is storing the energy from battery and allowing to dissipate at a much faster rate (Watts)than that is possible by the battery directly (due to its internal resistance). Right?

Hero999 · Dec 5, 2008

That's true and this principle certainly is used in a camera flash but a boost converter is required to increase the voltage to >300V.

Large capacitors are often used like this because it dramatically increase the peak current a power supply can provide.

Ubergeek63 · Dec 5, 2008

Hero999 said:
That's true and this principle certainly is used in a camera flash but a boost converter is required to increase the voltage to >300V.

Large capacitors are often used like this because it dramatically increase the peak current a power supply can provide.

Yes, I know, it is just that your original statements seemed like you were talking about taking it directly from the 9V battery.

Hero999 · Dec 5, 2008

That's true.

Nicads can probably supply more current than alkaline but I still don't think they can supply 81W.

ecerfoglio · Dec 5, 2008

diablo1 said:
Can I generate 80Watts of power with a portable battery?

blueroomelectronics said:
What battery do you have in mind?

Blueroomelectronics' question is still unanswered: We don't know what kind of battery we are talking about.

Some answers are about a 9v "transistor battery", which of course can not provide 80 W.

But a battery is a battery And they come in lota of sizes and capacities.

A car's battery certainly can provide 80 W - Just leave your headlights on (while the motor is not running) and you have more than 100 W for some time - And then there are even bigger batteries

Ubergeek63 · Dec 5, 2008

ecerfoglio said:
Blueroomelectronics' question is still unanswered: We don't know what kind of battery we are talking about.

Some answers are about a 9v "transistor battery", which of course can not provide 80 W.

But a battery is a battery And they come in lota of sizes and capacities.

A car's battery certainly can provide 80 W - Just leave your headlights on (while the motor is not running) and you have more than 100 W for some time - And then there are even bigger batteries

I did answer as to what kind of battery can supply that much... 7.2V NiMH R/C packs are regularly called upon to deliver 20A continuous, around 100-140W

blueroomelectronics · Dec 5, 2008

The OP didn't reply with the battery type so we can only make assumptions.

Nigel Goodwin · Dec 5, 2008

Ubergeek63 said:
I did answer as to what kind of battery can supply that much... 7.2V NiMH R/C packs are regularly called upon to deliver 20A continuous, around 100-140W

Yes, NiCd and NiMh R/C packs easily supply powers that high - and a couple more cells would give you 9V.

80W power source

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