Re: Problem with Hbridge circuit?


"legg" <legg@xxxxxxxxxxxxxxx> wrote in message
news:18q8945kssk4g9b83cbecvt5auiqlvlhuf@xxxxxxxxxx
On Sat, 2 Aug 2008 02:51:16 -0500, "Jon Slaughter"
<Jon_Slaughter@xxxxxxxxxxx> wrote:


"legg" <legg@xxxxxxxxxxxxxxx> wrote in message
news:n386949n05fct3k6h1n7mm4nulcs5n7h27@xxxxxxxxxx


Nfets are cheaper on a straight $perVA handling capability, due to fab
constraints at the wafer level.

Bootstrap gate drive is more versatile, simpler and cheaper than many
other options to drive high-side mosfets.

Try setting the pwm frequency in the pic controller to >1KHz, then
experiment with variations on the controller's duty cycle, based on
the known requirements of the drive method.


Still seems that the boost cap will not be discharged on the off cycle of
the pwm.

I probably can trick it though by hooking the boost cap to a small fet
that
will ground out on the off cycle and go high on the on cycle? (of course
this seems like a waste and I'll probably not do it)


It's the PIC that is the most versatile element in your breadboard,
and possibly the area of the design that you're most comfortable with.

Beg, borrow or buy some kind of scope, for troubleshooting AC
circuits.



I have a pc scope but since I brought a new computer without a parallel
port
I haven't been able to use it ;/ Since my MB is in about 5gal of vegtable
oil I haven't added an expansion card yet ;/ (just not looking forward to
adding the card because it will get messy ;/)


You got me.

I'm Slaughtered, and you're kill-filed.


That makes a lot of sense.



.

Relevant Pages

  • Re: Problem with Hbridge circuit?
    ... Try setting the pwm frequency in the pic controller to>1KHz, ... experiment with variations on the controller's duty cycle, ... Beg, borrow or buy some kind of scope, for troubleshooting AC ... oil I haven't added an expansion card yet;/ (just not looking forward to ...
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