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neede simple pwm controller

Started by Yzordderrex March 17, 2018
I am looking at doing a multi-purpose experimental battery charger board.  (M-PEBCB).

I use a 48v battery grid to run my house.  It is 8 strings of 27M deep cycle Sears Die Hard. I am looking to do a 100A/48V charger w/PFC.  I also have a 12v charger that needs a controller and I would also like to experiment with MPPT algorithms.

I intend to use a PIC to develop the current command signal.  PIC will have all the hooks for current and voltage sensing.  I am looking for some kind of PWM chip to follow the pic.

I would like just a controller with one PWM output to run a buck with synchronous rectifier. I will level shift and do gate drives separate.  I think a 8pin part should be able to do what I want.  

Any Ideas?



Den lørdag den 17. marts 2018 kl. 13.57.27 UTC+1 skrev Yzordderrex:
> I am looking at doing a multi-purpose experimental battery charger board. (M-PEBCB). > > I use a 48v battery grid to run my house. It is 8 strings of 27M deep cycle Sears Die Hard. I am looking to do a 100A/48V charger w/PFC. I also have a 12v charger that needs a controller and I would also like to experiment with MPPT algorithms. > > I intend to use a PIC to develop the current command signal. PIC will have all the hooks for current and voltage sensing. I am looking for some kind of PWM chip to follow the pic. > > I would like just a controller with one PWM output to run a buck with synchronous rectifier. I will level shift and do gate drives separate. I think a 8pin part should be able to do what I want. > > Any Ideas?
why not PWM directly from the PIC?
Good call Lasse Langwadt Christensen.  

I did a small charger for the AN/PRC-152 using a pic.  

  https://en.wikipedia.org/wiki/AN/PRC-152

It was an elegant solution to the problem.  The problem was I couldn't find a charger that I could synchronize to a clock.  Military radios want to keep everything synchronized in order to Minimize noise splatter in the sensitive receiver.

I'm not sure if I want to do that again.  I would think there would be a small 8 pin part that can generate pwm and maybe have some other functions that might be useful.  I can probably do it with a dual op-amp or comparator, or even a 555! Just kicking tires and seeing what is out there.  I don't mind using a 30yo part if it works.

Thanks again
Yzordderrex wrote...
> > I would think there would be a small 8 pin part > that can generate pwm ...
LTC6992. ATtiny13. -- Thanks, - Win
The LT part looks like it might work out.  I'll let you know.

Thanks
Bob
N9NEO
It's going on the board - thanks Win.
Yzordderrex wrote...
> > It's going on the board - thanks Win.
What did you choose? -- Thanks, - Win
On Wednesday, March 28, 2018 at 8:18:01 AM UTC-4, Winfield Hill wrote:
> Yzordderrex wrote... > > > > It's going on the board - thanks Win. > > What did you choose? > > > -- > Thanks, > - Win
I'm going to use the LT6992 part you suggested. I will use it to drive a synchronous buck for battery chargers.