No the PS Hbridge is not smokeless! By that I mean if both inputs are high
at the same time, high current will flow which can result in loss of the
output transistors. Unless the input resistor is set to 47K, the PS hbridge
can be more sensitive to self destructing compared to the original Tilden 6
transistor h bridge because with a 4.7K input resistor it can deliver more
current. The PS design reduces current when not needed but tries to supply
more current under heavy load.

There are more ways than one to design an h-bridge. It depends on what you
want to do. Here is a new smoke less design I will call HC-bridge because it
combines the best features of the H bridge and CMOS motor drivers. It has
forward, reverse, freewheel and brake modes. The smokeless and brake modes
can be added to the Tilden h-bridge but makes that design more complicated.

This HC-bridge circuit may be more suitable for your application but other
alternatives are available depending on your exact requirements.

wilf

-----Original Message-----
From: Evan Dudzik [mailto:evandude@...]
Sent: Tuesday, October 30, 2001 12:16 PM
To: beam@yahoogroups.com
Subject: [beam] PS Hbridge question


is your power smart Hbridge smokeless? I want to use
it on a microcontroller-based robot, and i don't trust
my programming skills enough yet to avoid "smoking"
the motor drivers... The reason i don't want to use
the "smokeless" hbridge you posted recently is that i
want to convert the bot to a microcore after i figure
out the walking dynamics, etc. from using the micro,
and so i can avoid high current drain later on when
using BEAM brains.

thanks...

Evandude

__________________________________________________
Do You Yahoo!?
Make a great connection at Yahoo! Personals.
http://personals.yahoo.com

To unsubscribe from this group, send an email to:
beam-unsubscribe@egroups.com



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/