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(Mechanoids): laptop DC power switchover unit for mains or solar PV plus 12V LVD low voltage disconnect repurposed to drive NiMH battery charger as dump load 1 DHD.jpg
D= [Jul 18, 2010]; S=5MB, 4000x3000; T=JPEG image [MIME:image/jpeg].

Rating: 54/100.

Key: D= file date of exhibit; S= size in bytes, XxY pixels, etc; T= type of exhibit; L= location/time or viewpoint of exhibit (if known).


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About This Category

Facets of mechanical devices and automation; machines of all sorts (though mainly man-made) including robots and computers.

You might like to visit 2001: A Space Odyssey (A Shrine), which includes tiny excerpts of HAL's famous utterances...

Some Similar Exhibits

ThumbnailExhibit Name
Thumbnaillaptop DC power switchover unit for mains or solar PV plus 12V LVD low voltage disconnect plus optoisolator sensors and USB digital input board constructed on stripboard and in transparent plastic boxes closeup 1 DHD.jpg (Mechanoids)

All my own design and construction! The LVD circuit using a MAX8212 voltage sensor and a P-channel high-side power MOSFET is the first time I've actually used a FET this beefy.

Thumbnaildiagram circuit schematic of improved DC supply voltage detector for automatic laptop power switchover between 12V DC 12VDC solar battery and 240V AC 240VAC mains fallback 1 DHD.gif (Mechanoids)

This is designed to drop power to the relay coil (and thus switch to mains power) as the voltage drops below 12V, and not power the relay again (to switch back to DC power) until the voltage rises above 13V. Note that the internal voltage reference/threshold is at 1.15V, so there should be a drop of 1V per 100K in the divider network on the left.

 


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