HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 30, 2012, 03:15 PM
Registered User
Joined Jan 2012
1 Posts
Discussion
How to implement PWM for H bridge?

I'm trying to figure out how to use an H bridge. I understand the theory and know how to make a working circuit.

But what's bothering me is whether my PWM is implemented in the best way. In the PWM off phase, I'm turning off all 4 switches (free wheeling mode) by disabling the L298 input enables. The alternative is to brake during the PWM off phase. This seems to be more efficient because the inductive energy in the coil is converted to mechanical energy instead of being dissipated in the diodes in free wheeling mode. But after that current is dissipated, the break mode would absorb mechanical energy, thus reducing efficiency.

Can someone tell me which method is best and for which situations?

Thanks
UncleJoe is offline Find More Posts by UncleJoe
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 31, 2012, 12:21 PM
Registered User
United States, NJ, Edison
Joined Mar 2008
34 Posts
See below for some rather in depth explanation of different H-bridge drive modes.

http://modularcircuits.tantosonline....ridge-secrets/
CombatWombat is offline Find More Posts by CombatWombat
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Cool View the bridge of chongqing chaotianmen bridge,across the bridge leemiller FPV Talk 2 Dec 12, 2011 06:38 AM
Help! H-bridge PWM frequancy???? Tophinater DIY Electronics 7 Jun 22, 2006 07:42 AM
Discussion H-Bridge vs. OPAmp for driving actuators? iter Scratchbuilt Indoor and Micro Models 8 Feb 13, 2006 03:56 AM
larger H-bridge for any rc servo spankedchrome DIY Electronics 0 Dec 02, 2005 08:41 AM