RE: In car PSUs...

[Keith Doxey <ukha@xxxxxxx>]

1. I think they need a better web/database designer for their online
catalogue. The details it gave me were....

Order Code: WC76H
Output Voltage (V): 4.12
Input Voltage (V): Jun-15
Output Current (A): 3

Exactly how many volts is the 15th of June and does the year affect the
current rating!!

2. No. It is a step down PWM regulator which works by turning the output
full on for a percentage of the time eg 1% = 1mS ON 99mS OFF, 50% = 50mS ON
50mS OFF. Very efficient for driving a motor but no good for much else. It
gives a short burst of the full battery power. You would need a switchmode
power supply to regulate the voltage. This has the ability to output a
greater voltage than the input which could vary between  8 and 14V
(starting
the engine and fully charged battery). A conventional linear power supply
needs an overhead of about 3 volts to operate properly so to guarantee a
rock steady 12V you would need a minimum of 15V.

Keith

-----Original Message-----
From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
Sent: 07 August 2001 23:13
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] In car PSUs...



Keith,

Looking at the Craplin catalogue their part number WC76H (page 329) looks
to
be a variable voltage regulator capable of outputs of 4 - 12v at 3A with an
input range of 6 - 15v. Do you think this would do for what I'm after? It's
down as intended for driving motors but what do you think?

Phil

> -----Original Message-----
> From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
> Sent: 07 August 2001 21:37
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] In car PSUs...
>
>
> I have borrowed an invertor from a fellow group member (thanks)
> and have one
> of the £20 ones on order from Maplin however I was thinking that
stepping
> 12v up to 240v and then back down to 12v has to be a bit
> inefficient at some
> stage plus I have a 12v DC power cord on order from Dabs for my laptop
(so
> that I don't have to use an invertor with the laptops PSU).
>
> Also, with Edward romping around in the back of the car and the
invertor
> underneath the passenger seat I just get a bit nervous at having 240V
> hanging around in the car...
>
> Phil
>
> > -----Original Message-----
> > From: Keith Doxey [mailto:ukha@xxxxxxx]
> > Sent: 07 August 2001 21:07
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] In car PSUs...
> >
> >
> > Why not get an inverter and use the CD writers PSU.
> >
> > The inverter would be useful in other ways. You could justify it
> > to SWMBO on
> > the grounds that it could power a Tv so she could still watch the
soaps
> > during a power cut :-)
> >
> > Keith
> >
>
>
>
>
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