H-bridge | Electronic Project Circuits

Posts Tagged ‘H-bridge’

DC Motor-Driver H-Bridge

Physical motion of some form helps differentiate a robot from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can’t pass enough current or voltage to spin a motor. Also, motors tend to be electrically noisy (spikes) and can slam power back into the control lines when the motor direction or speed is changed.
Specialized circuits (motor drivers) have been developed to supply motors with power and to isolate the other ICs from electrical problems. These circuits can be designed such that they can be completely separate boards, reusable from project to project.
A very popular circuit for driving DC motors (ordinary or gearhead) is called an H-bridge. It’s called that because it looks like the capital letter ‘H’ on classic schematics. The great ability of an H-bridge circuit is that the motor can be driven forward or backward at any speed, optionally using a completely independent power source.
An H-bridge design can be really simple for prototyping or really extravagant for added protection and isolation. An H-bridge can be implemented with various kinds of components (common bipolar transistors, FET transistors, MOSFET transistors, power MOSFETs, or even chips). [...]

Source: By David Cook

http://www.robotroom.com

Be the first to comment - What do you think? Posted by admin - March 15, 2009 at 3:12 am

Categories: Motor controller Tags: dc motor drive, H-bridge

H-bridge motor driver by TIP120,TIP125

This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn’t use exotic parts.

Read More Source:http://www.bobblick.com/techref/projects/hbridge/hbridge.html
Thank You.

Be the first to comment - What do you think? Posted by admin - February 22, 2008 at 11:35 pm

Categories: Electronic Control, Motor controller Tags: dc motor driver, H-bridge, motor controllers

Full-featured Dual H-bridge

Probably the simplest, reversible drive circuit is the H-Bridge. Some BEAMbots use H-bridge motor drivers; many more use an H-bridge variant of some sort. Here’s a simple conceptual schematic: Image A basic H-Bridge has 4 switches, relays, transistors, or other means of completing a circuit to drive a motor. In the above diagram, the switches are labeled A1, A2, B1, B2. Since each of the four switches can be either open or closed, there are 24 = 16 combinations of switch settings. Many are not useful and in fact, several should be avoided since they short out the supply current (e.g., A1 and B2 both closed at the same time). There are four combinations that are useful

Read More Source:http://www.solarbotics.net/library/circuits/driver_robinson.html
Thank you.