@ThePhoton boy are we un-thankful today

;o)

Hi

In a DC motor control application, if the max allowed supply voltage is 35V, how much should be the voltage rating for the MOSFETs in the H-Bridge?

It will work in industry. I am trying to make a clone of this: electromen.com/en/products/item/motor-controllers/…

Isn't 60V enough?

How the hell can this thing carry 100A? electromen.com/en/products/item/motor-controllers/dc-motor/…

@abdullahkahraman time division multiplexing?

@jippie lol, but really..

@abdullahkahraman Probably

if you had 1mΩ Rdson devices, then that's 10W * 2

a couple in parallel would drop that in half

would it be appropriate to determine the current draw from this piezo in terms of applied voltage and its capacitance spec? americanpiezo.com/images/stories/content_images/pdf/…

since I must drive it and know what load it will show to my supply

@EwokNightmares It would be a good ballpark value

depends on how fast you're trying to drive it

@W5VO it is 40kHz, 0DC bias square so I figure I would calculate the rise time I would like and the time to fill and discharge that cap in the period given from that

and that drive current would be a estimate for the load my supply needs to support

but possibly a big output capacitor will take care of that

it won't be a constant load

@EwokNightmares CV^2 f, so 2n * V^2 * 40k

output cap won't need to be that big since it's 40kHz

@W5VO That is not the thing I was worried about. How to carry 100A with those tracks? The PCB calculator says it will need about 2 inches tracks for 25 degree celcius rise of temperature and 2 oz copper.

@abdullahkahraman If the tracks are short, the usual formulas or charts for ampacity are over-conservative, because they don't consider heat loss at the ends of the tracks. So they could just have very short tracks and connect them at one end to something able to dissipate the heat.

@abdullahkahraman I was wondering about the screw terminals ... cc: @ThePhoton

@jippie You can actually get pretty beefy screw terminals

but you might want to look at lugs and crimp-on ring terminals for higher current

Is there a smart way to figure out the sensitive angle of a given PIR sensor in an existing appliance (hence no datasheet)?

And walking around it is not the answer I was looking for :-p

Over a 100 new questions on the stack in the past 24 hrs!? What is happening?