Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Oct 10, 2012, 09:56 AM
Registered User
Joined Oct 2012
224 Posts
Please don't break your car on purpose. ?
why , ?
fantasy1988 is offline Find More Posts by fantasy1988
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 10, 2012, 04:18 PM
Registered User
United States, NJ, Edison
Joined Mar 2008
34 Posts
Quote:
Originally Posted by jdraughn View Post
Wow, that thing is rock solid. Do you have a link detailing what components you used, and how you built your drive train?
It's just slot-car gears and a RadioShack-esque DC motor. It doesn't draw much current, really, so the bridge is not taxed at all.

Quote:
From the experiments I have conducted with random assortment of mosfets, the p-channel ones always get waaay hot, so I was going to try to go with a boot strapping high side driver like the MCP14700, but from your experience and results, maybe I need to buy GOOD mosfets. Which mosfets did you end up using, and what motor are you driving with them?
Are you sure your P-channels are fully on, and not stuck in the linear region? They have higher on-resistance than N-channel, but not by that much.
Really, as I found out, "GOOD" mosfets means looking at more than just the current rating. There is a trade-off between current rating, gate-capacitance, and to some extent cost. And even the "current" rating isn't very straight forward, since it depends on how quickly you can switch them on/off, switching frequency, shoot-through-avoidance, etc.

Having done it once (to learn), if I were to need another h-bridge, I would probably get an off-the-shelf unit like those seen here:
http://www.pololu.com/catalog/category/82
CombatWombat is offline Find More Posts by CombatWombat
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion How to implement PWM for H bridge? UncleJoe DIY Electronics 1 Jan 31, 2012 11:21 AM
Wanted OS 50 SX-H Carb # 40E Mixture Control Valve sgilkey Aircraft - Fuel - Engines and Accessories (FS/W) 0 Jan 13, 2012 10:10 AM
Cool View the bridge of chongqing chaotianmen bridge,across the bridge leemiller FPV Talk 2 Dec 12, 2011 05:38 AM
Sold REDUCED! W/FREE S&H! Phoenix 10 amp ESC $35 sensorless brushless motor speed control Trader Hill Aircraft - Electric - Power Systems (FS/W) 6 Apr 13, 2007 08:38 PM
For Sale REDUCED! W/FREE S&H! Phoenix 10 amp ESC $35 sensorless brushless motor speed control Trader Hill Aircraft - Electric - Power Systems (FS/W) 6 Apr 01, 2007 10:48 PM