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Auto laptop 12V/mains switchover design | 26 comments (26 topical, editorial)

Re: Auto laptop 12V/mains switchover design (3.00 / 0) (#12)
by Nando (nando37-at-tx-dot-rr-dot-com Correct theanti-spam) on Sun Jul 1st, 2007 at 07:07:31 PM MST
(User Info)

Normally the supplies put out the voltage via diodes and a storage capacitor.

The DC/DC or the AC switching power converter if above its reference stop producing energy and in this case the DC/DC is the master and the AC is the slave,

The slave as a PWM supply will stop producing energy and goes dormant with a few milliwatts of power.

We have several PC connected this way for many years, in a close set up almost like yours.

Nando

[ Parent ]

Re: Auto laptop 12V/mains switchover design (3.00 / 0) (#13)
by DamonHD (d@hd.org) on Sun Jul 1st, 2007 at 11:15:02 PM MST
(User Info) http://www.earth.org.uk/

Well, I'm simplifying my design an dropping one of the relays, thanks! I'll post a link to the updated design sometime today, I hope.

Rgds

Damon

[ Parent ]

Re: Auto laptop 12V/mains switchover design (3.00 / 0) (#21)
by DamonHD (d@hd.org) on Sun Jul 22nd, 2007 at 04:41:53 PM MST
(User Info) http://www.earth.org.uk/

Hi Nando,

The laptop mains adaptor is very good, and draws undetectably low power (I think << 2W) when it has no load.

Thus I am simplifying my design as you suggest and removing the mains transformer on the input side.

I am also connecting the OVs of the mains adaptor and 20V DC/DC converter supply together directly.

I am however still planning on switching between the mains adaptor and the DC/DC converter in the positive line with the relay. More details when I've built and tested...

Rgds

Damon

[ Parent ]

Auto laptop 12V/mains switchover design | 26 comments (26 topical, 0 editorial)

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