PLEASE TELL ME ABOUT "PWM CONTROL"

Started by baghi_b May 12, 2004

HI ALL,
I NEED VERY VERY URGENT NEED TO KNOW HOW CAN I USE THE PIC MICRO
( SPECIALLY 18F458 ),TO HAVE A HALF-BRIDGE SWITCHING POWER SUPPLY,
WITH 25KHZ SWITCHING FREQUENCY.
BIG PROBLEM IS LOW RESPONSE OF A/D OF PIC TO CONTROL ACTIVELY THE
WIDTHS OF PWM ACCORDING TO OUTPUT FEEDBACK.
MAY I USE A TRICK FOR THIS PROBLEM AND FEED A FRACTION OF MY OUTPUT
DC VOLTAGE DIRECTLY TO PIC MICRO AND HAVE A GOOD REGULATION?
PLEASE HELP ME!
THANK YOU



here's a good place to start:
<http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-
8&q=pwm+pic>

--- In , "baghi_b" <baghi_b@y...> wrote:
>
> HI ALL,
> I NEED VERY VERY URGENT NEED TO KNOW HOW CAN I USE THE PIC
MICRO
> ( SPECIALLY 18F458 ),TO HAVE A HALF-BRIDGE SWITCHING POWER SUPPLY,
> WITH 25KHZ SWITCHING FREQUENCY.
> BIG PROBLEM IS LOW RESPONSE OF A/D OF PIC TO CONTROL ACTIVELY THE
> WIDTHS OF PWM ACCORDING TO OUTPUT FEEDBACK.
> MAY I USE A TRICK FOR THIS PROBLEM AND FEED A FRACTION OF MY OUTPUT
> DC VOLTAGE DIRECTLY TO PIC MICRO AND HAVE A GOOD REGULATION?
> PLEASE HELP ME!
> THANK YOU