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RE: [Project] Power requirements
- To: <ukha_d@xxxxxxx>
- Subject: RE: [Project] Power requirements
- From: "Dr John Tankard" <john@xxxxxxx>
- Date: Tue, 29 May 2001 09:30:17 +0100
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> There was an article in the last issue of HomeAutomator that
> mentioned an
> emerging standard for Powered Ethernet specifically aimed at
> uses like this.
>
I will take a look, sounds interesting.
> Basically a supply of 50V DC @ 300mA was available which
> gives 50x0.3 =
> 15Watts of power
> 15Watts of available power could be converted to 5V @ 3A, 12V
> @ 1.25A or any
> other combination where the total power did not exceed 15watts.
>
> This does involve building a small Switch Mode Power Supply
> (SMPS) into the
> device but some form of regulation would be needed anyway to
> overcome any
> voltage drops. SMPS's are very efficient and dissipate little
> heat compared
> to Linear Voltage Regulators.
>
> Dedicated chips are available for the purpose but I would
> have to look up
> suitable types.
>
Great, let us know what you find
John
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