Enhanced PWM

[Jan Lichtenbelt]

Please find a very simple example program with enhanced PWM.
Used is a 16F1825 at 19.6...MHz.

The mode is half bridge drive with 2 outputs P2A and P2B, see picture below

half bridge drive.jpg (19.06 KiB) Viewed 2879 times

The 2 complementary outputs can be used for half bridge (motor) drive.

Driver rise time can be faster than falling time which will result in short current between V+ and ground. To prevent this the rise pulse must be delayed, see picture below

half bridge delay time.jpg (14.37 KiB) Viewed 2879 times

The practice oscilloscope pictures, see next page.

Refrences:
Pictures from: http://www.microchip.com/stellent/idcpl ... e=en546902

[Jan Lichtenbelt]

Please find some oscilloscope pictures:

1. Both PWM's above each other

P2A and P2B above each other.jpg (75.08 KiB) Viewed 2878 times

2. Both PWM's at the same level

P2A and P2B at same level.jpg (75.97 KiB) Viewed 2878 times