I am looking for a circuit that can reverse a DC motor( 12V/3A) with a +15VDC signal using mosfets. I have used contact closure and solid state relays but they have proved to be troublesome. Please advise.

 

Hello,

You will need a H-bride to reverse the motor drive direction.
Take a look at animation 5 on this page.
http://academics.vmi.edu/ee_dl/ee101/RobotSwitchingTutorial.htm

There is more information on DC motors over here.
http://www.educypedia.be/electronics/powermotor.htm

Information on brushless DC motors can be found here.
http://www.educypedia.be/electronics/motorBrushless.htm
Other motor topics can be found here.

Motor and generators: Brushless DC motors Motor AC Motor-Synchronous Single phase AC motors Generators Motor DC Robot Stepper motor Generator: asynchronous Motor overview Servomotor Stepper motor drivers
Greetings,
Bertus

 

Monolithic H-bridge drivers are available from competing manufacturers. You can also acquire monolithic H-bridge motor drivers, such as the LMD18200, in the power range you seek.

 

ST Microelectronics' VNH2SP30-E - Automotive Fully Integrated H-Bridge Motor Driver is one you could look at. It's so integrated that all you'd really need to control it would be a SPDT On-Off-On spring-loaded rocker or bat-handled switch.

 

http://www.pcbheaven.com/handbook/archive/desc.php?AW=motor+control&EP=&NW=&NO=&pg=1

Still not found?