H Bridge Wiring Diagram. If q1 and q4 are turned on the left lead of the motor will be connected to the power supply while the right lead is connected to ground. Motors can be driven forward or reverse with simple ttl or cmos logic signals or with pulse width modulation pwm.
An h bridge circuit allows logic chips even microcontrollers to provide power to a dc motor standard or gearhead. H bridge is a very effective method for driving motors and it finds a lot of applications in many electronic projects especially in robotics. Motors can be driven forward or reverse with simple ttl or cmos logic signals or with pulse width modulation pwm.
The circuit shown here is a typical four transistor h bridge.
The basic operating mode of an h bridge is fairly simple. The diodes d1 to d4 provide a safer path for the back emf from the motor to dissipate and thus it protects the corresponding bipolar. An h bridge is a simple circuit that lets you control a dc motor to go backward or forward. When you can control two motors to go either forward or backward you can build yourself a robot.
