Undervoltage detector patent application

[matseng]

Are these guys for real? Many software patents is really ridiculous and stupid, but this Shenzhen based company that a few years ago filed a patent application for a under voltage detection design must either be too rich and can spend money on patent lawyers for something as simple as this or they just think that have made some discovery of a new very funky and special design.

http://www.faqs.org/patents/imgfull/20110025518_01

Can this be patented? Hahaha!

[Alex555]

I hate it when people patent really simple circuits. It's just one of those things that bug me.

[arakis]

can someone explain how this circuit even works, cause in my mind it shouldn't.

I get that when the voltage is over the Zenere Level the transistor will holt the SCR gate low, and when the voltage drops the transistor will switch on the SCR... But here is the question, how do you get to that point... If you apply voltage from 0 that SCR will at some point be triggered, and it won't shutoff when the transistor pulls the gate low...

[exerion]

Well... software patents are even more stupid... like this one:

http://www.faqs.org/patents/imgfull/20130036183_01

Therefore I wouldn't call it software because it's more like an abstract design that other thing... anyway it sucks.

No comments.

[vimark]

That undervoltage detector circuit would lock out (always on) when used on DC I think